:root {
  --bg: #f6f3ee;
  --bg-ink: rgba(31, 41, 55, 0.045);
  --surface: #ffffff;
  --surface-soft: #fffaf2;
  --text: #253044;
  --heading: #141c2f;
  --muted: #69758a;
  --line: #e2ddd3;
  --line-soft: #eee8dc;
  --blue: #2864dc;
  --blue-strong: #1746a2;
  --blue-soft: #e8f1ff;
  --green: #1d9a74;
  --green-soft: #e5f7ee;
  --amber: #ea8a2f;
  --amber-soft: #fff1d8;
  --red: #dc3c3c;
  --red-soft: #fff0ed;
  --violet: #7c5ccf;
  --violet-soft: #f2edff;
  --coral: #ff6b5f;
  --mint: #48c5a7;
  --ink-shadow: 0 1px 1px rgba(31, 41, 55, 0.04);
  --shadow: 0 24px 54px rgba(66, 54, 38, 0.13);
  --shadow-sm: 0 10px 26px rgba(66, 54, 38, 0.08);
  font-family: Inter, Manrope, Roboto, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 16px 16px, rgba(234, 138, 47, 0.16) 0 2px, transparent 3px),
    linear-gradient(135deg, rgba(72, 197, 167, 0.09), transparent 34%),
    linear-gradient(315deg, rgba(255, 107, 95, 0.08), transparent 38%),
    var(--bg);
  background-size: 34px 34px, auto, auto, auto;
  color: var(--text);
  font-size: 15px;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

button,
a,
input,
select,
textarea {
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.18);
  outline-offset: 2px;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 22% 18%, rgba(255, 107, 95, 0.18), transparent 26%),
    radial-gradient(circle at 78% 74%, rgba(72, 197, 167, 0.16), transparent 28%),
    radial-gradient(circle at 16px 16px, rgba(31, 41, 55, 0.055) 0 2px, transparent 3px),
    var(--bg);
  background-size: auto, auto, 34px 34px, auto;
}

.login-panel {
  width: min(440px, 100%);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(255, 250, 242, 0.96)),
    var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 30px;
  position: relative;
  overflow: hidden;
}

.login-panel::before {
  content: "x² + y²";
  position: absolute;
  right: 20px;
  top: 16px;
  color: rgba(234, 138, 47, 0.18);
  font-size: 18px;
  font-weight: 800;
}

.login-panel::after {
  content: "";
  position: absolute;
  right: -44px;
  bottom: -44px;
  width: 148px;
  height: 148px;
  border-radius: 50%;
  background: rgba(72, 197, 167, 0.14);
  pointer-events: none;
}

.login-mascot {
  position: absolute;
  right: 28px;
  bottom: 22px;
  opacity: 0.86;
  pointer-events: none;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
  position: relative;
  z-index: 1;
}

.login-panel form,
.login-panel .error,
.login-panel p {
  position: relative;
  z-index: 1;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #ffffff;
  background: #214fd7;
  box-shadow: inset 0 -10px 18px rgba(17, 24, 39, 0.14), 0 10px 22px rgba(37, 99, 235, 0.22);
  font-weight: 800;
}

.mascot {
  position: relative;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
}

.mascot.small {
  width: 42px;
  height: 42px;
}

.mascot.large {
  width: 92px;
  height: 92px;
}

.mascot.tiny {
  width: 30px;
  height: 30px;
}

.mascot-face {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 8px;
  background:
    radial-gradient(circle at 32% 26%, rgba(255, 255, 255, 0.74), transparent 18%),
    linear-gradient(135deg, #ffb84d, #ff6b5f 48%, #2864dc 100%);
  box-shadow: inset 0 -10px 18px rgba(20, 28, 47, 0.16), 0 12px 24px rgba(255, 107, 95, 0.24);
  transform: rotate(-5deg);
}

.mascot.tiny .mascot-face {
  border-radius: 7px;
}

.mascot-eye {
  position: absolute;
  top: 38%;
  width: 12%;
  height: 12%;
  border-radius: 50%;
  background: #14213d;
}

.mascot-eye.left {
  left: 32%;
}

.mascot-eye.right {
  right: 31%;
}

.mascot-smile {
  position: absolute;
  left: 34%;
  bottom: 26%;
  width: 32%;
  height: 16%;
  border-bottom: 3px solid #14213d;
  border-radius: 0 0 999px 999px;
}

.mascot-spark {
  position: absolute;
  border-radius: 999px;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(72, 197, 167, 0.16);
}

.mascot-spark.one {
  width: 10px;
  height: 10px;
  right: -2px;
  top: 3px;
}

.mascot-spark.two {
  width: 7px;
  height: 7px;
  left: -1px;
  bottom: 7px;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(234, 138, 47, 0.15);
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: 24px;
  color: var(--heading);
}

h2 {
  font-size: 24px;
  color: var(--heading);
}

h3 {
  font-size: 17px;
  color: var(--heading);
}

p {
  color: var(--muted);
  line-height: 1.5;
}

.field {
  display: grid;
  gap: 7px;
  margin-bottom: 14px;
}

.field label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.input,
.select,
.textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: #fffdf8;
  border-radius: 8px;
  padding: 12px 13px;
  color: var(--text);
  box-shadow: var(--ink-shadow);
}

.input:hover,
.select:hover,
.textarea:hover {
  border-color: #d8cfc1;
}

.input:focus,
.select:focus,
.textarea:focus {
  border-color: rgba(234, 138, 47, 0.72);
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(234, 138, 47, 0.12);
  outline: 0;
}

.textarea {
  min-height: 96px;
  resize: vertical;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  border-radius: 8px;
  padding: 10px 14px;
  background: linear-gradient(135deg, var(--blue), #2d8bdc);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 12px 22px rgba(40, 100, 220, 0.2);
}

.btn:hover {
  background: linear-gradient(135deg, var(--blue-strong), var(--blue));
  transform: translateY(-1px);
}

.btn.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
  box-shadow: var(--ink-shadow);
}

.btn.secondary:hover {
  background: #ffffff;
  border-color: #cbd7e8;
  color: var(--blue-strong);
}

.btn.ghost {
  color: var(--blue);
  background: transparent;
  padding-inline: 6px;
}

.btn.warn {
  background: var(--amber);
}

.error {
  padding: 10px 12px;
  border-radius: 8px;
  color: #991b1b;
  background: var(--red-soft);
  margin-bottom: 12px;
  border: 1px solid #fecaca;
}

.hint {
  font-size: 13px;
  color: var(--muted);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 264px 1fr;
}

.sidebar {
  background:
    radial-gradient(circle at 26px 92px, rgba(255, 107, 95, 0.18), transparent 64px),
    linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(255, 250, 242, 0.92)),
    var(--surface);
  background-size: auto;
  border-right: 1px solid var(--line);
  padding: 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  box-shadow: 10px 0 36px rgba(30, 41, 59, 0.04);
}

.sidebar-note {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 12px 0 20px;
  padding: 10px;
  border: 1px solid rgba(234, 138, 47, 0.24);
  border-radius: 8px;
  background: rgba(255, 248, 235, 0.78);
  color: #765233;
  font-size: 12px;
  font-weight: 750;
}

.nav {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.nav button {
  min-height: 42px;
  border-radius: 8px;
  color: #3c485d;
  background: transparent;
  text-align: left;
  padding: 10px 12px 10px 14px;
  font-weight: 650;
  position: relative;
}

.nav button:hover {
  background: rgba(255, 107, 95, 0.09);
  color: var(--blue-strong);
}

.nav button.active {
  background:
    linear-gradient(90deg, rgba(255, 184, 77, 0.16), rgba(255, 255, 255, 0.92)),
    #ffffff;
  color: var(--blue-strong);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.nav button.active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  bottom: 9px;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--coral), var(--amber));
}

.main {
  min-width: 0;
}

.topbar {
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 24px;
  background: rgba(246, 243, 238, 0.82);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(14px);
}

.content {
  padding: 26px;
  display: grid;
  gap: 20px;
  max-width: 1280px;
  width: 100%;
}

.toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
}

.assignments-toolbar {
  position: relative;
  justify-content: center;
  text-align: center;
  min-height: 48px;
}

.assignments-toolbar h2 {
  margin: 0;
  color: var(--heading);
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.05;
  font-weight: 950;
}

.assignments-toolbar > .btn {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.grid {
  display: grid;
  gap: 16px;
}

.grid.cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(255, 253, 248, 0.96)),
    var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 17px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.78);
}

.card:hover {
  border-color: #d8cfc1;
  box-shadow: var(--shadow);
}

.subpanel {
  display: grid;
  gap: 10px;
  padding: 13px 0 0;
  margin-top: 13px;
  border-top: 1px dashed #cfd9e8;
}

.teacher-comment {
  display: grid;
  gap: 6px;
  padding: 13px 14px;
  border: 1px solid #d6e6ff;
  border-left: 4px solid var(--blue);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(18, 103, 243, 0.075), rgba(255, 255, 255, 0.96)),
    #ffffff;
}

.teacher-comment span {
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.teacher-comment p {
  margin: 0;
  color: var(--heading);
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.score-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid #cfe0ff;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(18, 103, 243, 0.11), rgba(255, 255, 255, 0.96)),
    #ffffff;
}

.score-summary span {
  display: block;
  margin-bottom: 4px;
  color: #52657f;
  font-size: 12px;
  font-weight: 850;
}

.score-summary strong {
  color: var(--heading);
  font-size: 24px;
  line-height: 1;
}

.score-summary b {
  min-width: 62px;
  height: 38px;
  display: grid;
  place-items: center;
  padding: 0 12px;
  border-radius: 999px;
  color: #ffffff;
  background: var(--blue);
  box-shadow: 0 10px 22px rgba(18, 103, 243, 0.2);
}

.attachment-block {
  display: grid;
  gap: 9px;
  margin-top: 12px;
}

.assignment-student-card {
  width: 100%;
  display: grid;
  gap: 14px;
  text-align: left;
}

.assignment-student-card:hover {
  border-color: #bfd0e8;
}

.student-title {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.student-title-top {
  align-items: flex-start;
}

.student-title.compact-row {
  gap: 8px;
}

.student-avatar,
.avatar-ring {
  overflow: hidden;
}

.student-avatar {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 999px;
  color: color-mix(in srgb, var(--avatar-color) 72%, #0f172a);
  background: color-mix(in srgb, var(--avatar-color) 13%, #ffffff);
  border: 1px solid color-mix(in srgb, var(--avatar-color) 28%, #dbe8ff);
  font-size: 14px;
  font-weight: 900;
  box-shadow: 0 10px 22px color-mix(in srgb, var(--avatar-color) 16%, transparent);
}

.student-avatar.compact {
  width: 36px;
  height: 36px;
  font-size: 12px;
}

.student-avatar.tiny {
  width: 28px;
  height: 28px;
  font-size: 10px;
  box-shadow: none;
}

.student-avatar img,
.avatar-ring img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.student-work-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.profile-page {
  display: grid;
  gap: 16px;
}

.profile-toolbar {
  justify-content: center;
  text-align: center;
}

.profile-toolbar h2 {
  margin: 0;
  color: var(--heading);
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.05;
  font-weight: 950;
}

.profile-card {
  overflow: hidden;
}

.profile-form {
  display: grid;
  gap: 22px;
}

.profile-avatar-panel {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  padding: 18px;
  border: 1px solid #d6e6ff;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(18, 103, 243, 0.09), rgba(255, 255, 255, 0.96)),
    #ffffff;
}

.profile-avatar-panel h3 {
  margin-bottom: 4px;
}

.profile-avatar-preview {
  width: 104px;
  height: 104px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--blue), #79a9ff);
  font-size: 30px;
  font-weight: 900;
  overflow: hidden;
  box-shadow: 0 16px 34px rgba(18, 103, 243, 0.2);
}

.avatar-upload {
  position: relative;
  margin-top: 12px;
}

.avatar-upload input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.student-work-stats span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--muted);
  background: #f1f5f9;
  font-size: 12px;
  font-weight: 700;
}

.student-work-stats .btn {
  min-height: 30px;
  padding: 6px 10px;
  font-size: 12px;
}

.group-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.group-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    radial-gradient(circle at 92% 12%, rgba(18, 103, 243, 0.08), transparent 34%),
    #ffffff;
  box-shadow: 0 12px 26px rgba(16, 24, 40, 0.045);
}

.group-card h3,
.group-target-card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
}

.group-members {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 12px;
}

.group-members span {
  padding: 6px 9px;
  border: 1px solid #dbe8ff;
  border-radius: 999px;
  background: #f3f8ff;
  color: #31537d;
  font-size: 12px;
  font-weight: 700;
}

.group-target-card {
  border-color: #d6e6ff;
  background:
    linear-gradient(135deg, rgba(18, 103, 243, 0.065), transparent 40%),
    #ffffff;
}

.attachment-title {
  color: var(--heading);
  font-size: 13px;
  font-weight: 800;
}

.attachment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(138px, 1fr));
  gap: 10px;
}

.attachment-item {
  min-width: 0;
  display: grid;
  gap: 7px;
  color: var(--text);
  text-decoration: none;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  padding: 8px;
  box-shadow: var(--ink-shadow);
}

.attachment-item:hover {
  border-color: #bfd0e8;
  color: var(--blue-strong);
  transform: translateY(-1px);
}

.attachment-item img,
.attachment-file {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 6px;
  background: #eef4ff;
  object-fit: cover;
  border: 1px solid #dbe7f7;
}

.attachment-file {
  display: grid;
  place-items: center;
  color: var(--blue-strong);
  font-weight: 800;
}

.attachment-item span:last-child {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 700;
}

.preview-backdrop {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  background: #0f172a;
}

.preview-shell {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: auto 1fr;
  background:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    #0f172a;
  background-size: 30px 30px;
}

.preview-topbar {
  min-width: 0;
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
  color: #ffffff;
  background: rgba(15, 23, 42, 0.94);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.annotation-toolbar {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-left: auto;
}

.annotation-pen {
  position: relative;
}

.annotation-pen-menu {
  position: absolute;
  z-index: 20;
  top: calc(100% + 8px);
  left: 0;
  width: 238px;
  display: none;
  gap: 8px;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(15, 23, 42, 0.96);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.3);
}

.annotation-pen-menu.open {
  display: grid;
}

.annotation-menu-label {
  color: #cbd5e1;
  font-size: 12px;
  font-weight: 900;
}

.annotation-colors {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin: 0;
  padding: 5px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
}

.color-swatch {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 2px solid rgba(255, 255, 255, 0.42);
  border-radius: 999px;
  background: var(--swatch-color);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.24);
}

.color-swatch:hover,
.color-swatch.active {
  border-color: #ffffff;
  transform: translateY(-1px);
  box-shadow:
    0 0 0 3px rgba(147, 197, 253, 0.34),
    inset 0 0 0 2px rgba(255, 255, 255, 0.26);
}

.annotation-sizes {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}

.size-swatch {
  min-height: 38px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
}

.size-swatch span {
  display: block;
  border-radius: 999px;
  background: #e5edf8;
}

.size-swatch:hover,
.size-swatch.active {
  border-color: rgba(147, 197, 253, 0.8);
  background: rgba(37, 99, 235, 0.82);
}

.tool-btn {
  min-height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  padding: 8px 11px;
  color: #e5edf8;
  background: rgba(255, 255, 255, 0.08);
  font-size: 13px;
  font-weight: 800;
}

.tool-btn:hover,
.tool-btn.active {
  color: #ffffff;
  background: rgba(37, 99, 235, 0.82);
  border-color: rgba(147, 197, 253, 0.7);
}

.preview-topbar .hint {
  color: #cbd5e1;
}

.preview-file {
  min-width: 0;
}

.preview-file strong {
  display: block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.preview-stage {
  min-width: 0;
  min-height: 0;
  display: grid;
  place-items: center;
  padding: 18px;
  overflow: auto;
}

.preview-image-wrap {
  position: relative;
  display: inline-block;
  max-width: 100%;
  max-height: calc(100vh - 110px);
}

.preview-image {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 110px);
  object-fit: contain;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.34);
}

.preview-annotation-image,
.annotation-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border-radius: 8px;
}

.preview-annotation-image {
  pointer-events: none;
}

.annotation-canvas {
  cursor: crosshair;
  touch-action: none;
}

.preview-frame {
  width: min(1120px, 100%);
  height: calc(100vh - 110px);
  border: 0;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.34);
}

.preview-empty {
  width: min(420px, 100%);
  display: grid;
  justify-items: center;
  gap: 14px;
  padding: 24px;
  border-radius: 8px;
  background: #ffffff;
  text-align: center;
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.26);
}

.metric {
  display: grid;
  gap: 7px;
  overflow: hidden;
}

.metric::before {
  content: "∫";
  position: absolute;
  right: 17px;
  top: 8px;
  color: rgba(37, 99, 235, 0.12);
  font-size: 42px;
  font-weight: 800;
  line-height: 1;
}

.metric strong {
  color: var(--heading);
  font-size: 31px;
  line-height: 1;
}

.metric {
  border-color: rgba(234, 138, 47, 0.28);
}

.metric::before {
  content: "∫";
  color: rgba(255, 107, 95, 0.14);
}

.metric::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--coral), var(--amber), var(--mint));
  border-radius: 0 0 8px 8px;
  pointer-events: none;
}

.list {
  display: grid;
  gap: 10px;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.row.wrap {
  flex-wrap: wrap;
}

.muted {
  color: var(--muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text);
  background: #eef2f7;
  border: 1px solid transparent;
}

.badge.new,
.badge.assigned {
  color: var(--blue-strong);
  background: linear-gradient(135deg, #e8f1ff, #fff4df);
  border-color: #d9e6ff;
}

.badge.submitted,
.badge.reviewing {
  color: #7a3f16;
  background: var(--amber-soft);
  border-color: #f6d19a;
}

.badge.checked {
  color: #15803d;
  background: linear-gradient(135deg, var(--green-soft), #f7fff7);
  border-color: #c9efd5;
}

.badge.revision {
  color: #92400e;
  background: var(--amber-soft);
  border-color: #fde8aa;
}

.badge.overdue {
  color: #b91c1c;
  background: var(--red-soft);
  border-color: #fecaca;
}

.notification-card.overdue-notification {
  border-color: #fecaca;
  background:
    linear-gradient(135deg, rgba(239, 68, 68, 0.055), transparent 38%),
    #ffffff;
}

.progress {
  height: 11px;
  overflow: hidden;
  border-radius: 999px;
  background: #e9eef6;
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.08);
}

.progress span {
  display: block;
  height: 100%;
  width: var(--value);
  background: var(--blue);
  border-radius: inherit;
}

.progress.low span {
  background: var(--red);
}

.progress.mid span {
  background: var(--amber);
}

.progress.good span {
  background: var(--green);
}

.progress.active span {
  background: var(--blue);
}

.progress-toolbar {
  justify-content: center;
  text-align: center;
}

.progress-toolbar h2 {
  margin: 0;
  color: var(--heading);
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.05;
  font-weight: 950;
}

.progress-overview-card {
  display: grid;
  grid-template-columns: minmax(170px, 220px) minmax(0, 1fr);
  align-items: center;
  gap: 22px;
  overflow: hidden;
}

.progress-overview-card::before {
  content: "";
  position: absolute;
  right: 18px;
  top: 16px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(72, 197, 167, 0.16), transparent 62%),
    radial-gradient(circle at 38% 36%, rgba(40, 100, 220, 0.16), transparent 42%);
  pointer-events: none;
}

.progress-dial {
  position: relative;
  z-index: 1;
  width: min(100%, 200px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background:
    conic-gradient(var(--blue) var(--value), #e7edf7 0),
    #e7edf7;
  box-shadow: 0 18px 40px rgba(40, 100, 220, 0.16);
}

.progress-dial::before {
  content: "";
  position: absolute;
  inset: 16px;
  border-radius: inherit;
  background: #ffffff;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.95);
}

.progress-dial > div {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 4px;
  text-align: center;
}

.progress-dial strong {
  color: var(--heading);
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1;
}

.progress-dial span,
.progress-highlight-row span,
.progress-status-row span,
.progress-result-score span {
  color: var(--muted);
  font-weight: 800;
  font-size: 12px;
}

.progress-overview-copy {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 13px;
}

.progress-overview-copy p {
  margin: 0;
  max-width: 680px;
  color: var(--muted);
  line-height: 1.55;
}

.progress-highlight-row {
  display: grid;
  grid-template-columns: minmax(120px, 180px) minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  padding: 12px 14px;
  border: 1px solid #dde7f7;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.68);
}

.progress-highlight-row strong {
  min-width: 0;
  overflow-wrap: anywhere;
}

.progress-chart-card,
.progress-status-card,
.progress-results-card {
  display: grid;
  gap: 16px;
}

.progress-chart-scroll {
  width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 2px 2px 12px;
  overscroll-behavior-x: contain;
  scrollbar-color: rgba(40, 100, 220, 0.55) #e7edf7;
  scrollbar-width: thin;
}

.progress-chart-scroll::-webkit-scrollbar {
  height: 9px;
}

.progress-chart-scroll::-webkit-scrollbar-track {
  border-radius: 999px;
  background: #e7edf7;
}

.progress-chart-scroll::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: linear-gradient(90deg, var(--blue), #52d4aa);
}

.progress-chart {
  min-height: 220px;
  display: grid;
  grid-template-columns: repeat(var(--chart-columns, 6), minmax(92px, 1fr));
  min-width: max(100%, calc(var(--chart-columns, 6) * 112px));
  gap: 12px;
  align-items: end;
  padding-top: 14px;
}

.progress-chart-column {
  min-width: 0;
  display: grid;
  gap: 8px;
  align-items: end;
}

.progress-chart-bar {
  position: relative;
  min-height: 58px;
  height: 58px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 8px;
  border-radius: 8px 8px 4px 4px;
  background: linear-gradient(180deg, #4a84ff, #2864dc);
  box-shadow: 0 14px 28px rgba(40, 100, 220, 0.18);
}

.progress-chart-bar.low {
  background: linear-gradient(180deg, #ff7a70, #dc3c3c);
}

.progress-chart-bar.mid {
  background: linear-gradient(180deg, #f5a84c, #ea8a2f);
}

.progress-chart-bar.good {
  background: linear-gradient(180deg, #52d4aa, #1d9a74);
}

.progress-chart-bar span {
  color: #ffffff;
  font-weight: 900;
  font-size: 12px;
}

.progress-chart-column small {
  min-width: 0;
  color: var(--muted);
  font-weight: 800;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
}

.progress-status-list,
.progress-result-list {
  display: grid;
  gap: 12px;
}

.progress-status-row {
  display: grid;
  gap: 8px;
  padding: 12px;
  border: 1px solid #dde7f7;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.progress-status-row > div:first-child {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.progress-result-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 14px;
  border: 1px solid #dde7f7;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(40, 100, 220, 0.055), transparent 46%),
    rgba(255, 255, 255, 0.76);
}

.progress-result-row h4 {
  margin: 0 0 4px;
  color: var(--heading);
  font-size: 16px;
}

.progress-teacher-note {
  margin: 10px 0 0;
  padding: 10px 12px;
  border-left: 4px solid var(--blue);
  border-radius: 8px;
  background: var(--blue-soft);
  color: #214166;
  line-height: 1.45;
}

.progress-result-score {
  min-width: 118px;
  display: grid;
  gap: 3px;
  justify-items: center;
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid #cdddfa;
  background: #eef5ff;
}

.progress-result-score strong {
  color: var(--blue-strong);
  font-size: 22px;
}

.progress-result-score.low {
  border-color: #ffd0cb;
  background: var(--red-soft);
}

.progress-result-score.low strong {
  color: #b91c1c;
}

.progress-result-score.mid {
  border-color: #fee2ac;
  background: var(--amber-soft);
}

.progress-result-score.mid strong {
  color: #9a4a05;
}

.progress-result-score.good {
  border-color: #c6efd8;
  background: var(--green-soft);
}

.progress-result-score.good strong {
  color: #0f7a55;
}

.progress-empty {
  padding: 18px;
  border: 1px dashed #cbd7ea;
  border-radius: 8px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.62);
  line-height: 1.5;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(15, 23, 42, 0.3);
  backdrop-filter: blur(8px);
}

.modal {
  width: min(720px, 100%);
  max-height: min(86vh, 780px);
  overflow: auto;
  background: #ffffff;
  border-radius: 8px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 22px;
}

.lesson-backdrop {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(15, 23, 42, 0.38);
  backdrop-filter: blur(10px);
}

.lesson-expanded {
  width: min(760px, 100%);
  max-height: min(88vh, 780px);
  overflow: auto;
  display: grid;
  gap: 18px;
  padding: 24px;
  border-radius: 8px;
  border: 1px solid rgba(207, 217, 232, 0.9);
  background:
    linear-gradient(90deg, rgba(37, 99, 235, 0.06), transparent 36%),
    #ffffff;
  box-shadow: 0 28px 80px rgba(15, 23, 42, 0.24);
}

.lesson-expanded-head {
  align-items: flex-start;
}

.lesson-expanded-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.lesson-detail,
.lesson-section {
  min-width: 0;
  display: grid;
  gap: 7px;
  padding: 13px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.lesson-detail span,
.lesson-section span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.lesson-detail strong {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--heading);
}

.lesson-section a {
  min-width: 0;
  overflow-wrap: anywhere;
  color: var(--blue-strong);
  font-weight: 700;
}

.lesson-section p {
  margin: 0;
  color: var(--text);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.form-grid .wide {
  grid-column: 1 / -1;
}

.form-divider {
  padding-top: 8px;
  color: var(--heading);
  font-weight: 900;
  border-top: 1px solid var(--line);
}

.upload-box {
  padding: 12px;
  border: 1px dashed #c6d4e6;
  border-radius: 8px;
  background: #f8fbff;
}

.calendar {
  display: grid;
  gap: 12px;
}

.calendar-board {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.calendar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(255, 107, 95, 0.09), rgba(72, 197, 167, 0.08) 52%, transparent),
    #ffffff;
}

.calendar-head h3 {
  text-transform: capitalize;
}

.calendar-tools {
  display: flex;
  align-items: center;
  gap: 16px;
}

.calendar-switcher {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbff;
  box-shadow: var(--ink-shadow);
}

.icon-btn {
  width: 36px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid transparent;
  border-radius: 7px;
  background: transparent;
  color: var(--heading);
  font-size: 0;
  font-weight: 800;
  line-height: 1;
  box-shadow: none;
}

.icon-btn::before {
  content: attr(data-arrow);
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  font-size: 23px;
  line-height: 1;
  transform: translateY(-1px);
}

.icon-btn[data-calendar-shift="-1"]::before {
  content: "‹";
}

.icon-btn[data-calendar-shift="1"]::before {
  content: "›";
}

.icon-btn:hover {
  border-color: #d7e2f1;
  color: var(--blue-strong);
  background: #ffffff;
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.12);
}

.icon-btn:disabled {
  cursor: not-allowed;
  color: #a8b4c4;
  background: transparent;
  border-color: transparent;
  box-shadow: none;
  transform: none;
}

.calendar-legend {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.calendar-legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  display: inline-block;
}

.legend-dot.planned {
  background: var(--blue);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.legend-dot.today {
  border: 2px solid var(--blue);
  background: #ffffff;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  background: var(--line);
  gap: 1px;
}

.calendar-weekday {
  min-height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f8fbff;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.calendar-day {
  width: 100%;
  border: 0;
  min-height: 132px;
  background: #ffffff;
  padding: 10px;
  display: grid;
  align-content: start;
  gap: 8px;
  position: relative;
  text-align: left;
}

button.calendar-day {
  cursor: pointer;
}

button.calendar-day:hover {
  background:
    linear-gradient(180deg, rgba(37, 99, 235, 0.075), transparent 42%),
    #ffffff;
}

button.calendar-day:focus-visible {
  z-index: 1;
  outline: 3px solid rgba(37, 99, 235, 0.22);
  outline-offset: -3px;
}

.calendar-day.muted-day {
  background: #f8fafc;
  color: #94a3b8;
}

.calendar-day.today {
  box-shadow: inset 0 0 0 2px rgba(37, 99, 235, 0.32);
}

.calendar-day.has-events {
  background:
    linear-gradient(180deg, rgba(72, 197, 167, 0.08), transparent 38%),
    #ffffff;
}

.calendar-date {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: var(--heading);
  font-size: 13px;
  font-weight: 800;
}

.calendar-day.today .calendar-date {
  background: var(--blue);
  color: #ffffff;
}

.calendar-events {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.calendar-event {
  min-width: 0;
  min-height: 28px;
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr);
  align-items: center;
  gap: 6px;
  border: 1px solid #d8e4f5;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
  padding: 5px 7px;
  color: #1e3a8a;
  box-shadow: var(--ink-shadow);
}

.calendar-event-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
}

.calendar-event-time {
  font-size: 11px;
  font-weight: 800;
}

.calendar-event-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 700;
}

.calendar-more {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  padding-left: 4px;
}

.lesson {
  width: 100%;
  text-align: left;
  border-left: 4px solid var(--mint);
  background:
    linear-gradient(90deg, rgba(72, 197, 167, 0.095), transparent 34%),
    #ffffff;
}

.lesson:hover {
  border-color: #bfd0e8;
  border-left-color: var(--coral);
}

.lesson:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.2);
  outline-offset: 2px;
}

.student-dot {
  width: 11px;
  height: 11px;
  border-radius: 999px;
  background: var(--blue);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topbar {
    position: static;
    padding-inline: 16px;
  }

  .content {
    padding: 16px;
  }

  .grid.cols-2,
  .grid.cols-3,
  .form-grid,
  .lesson-expanded-grid {
    grid-template-columns: 1fr;
  }

  .calendar-board {
    overflow-x: auto;
  }

  .calendar-head,
  .calendar-grid {
    min-width: 760px;
  }
}

@media (max-width: 520px) {
  .row {
    align-items: flex-start;
    flex-direction: column;
  }

  .lesson .row .row {
    align-items: center;
    flex-direction: row;
    width: auto;
  }

  .btn {
    width: 100%;
  }

  .nav {
    grid-template-columns: 1fr;
  }

  .calendar-board {
    margin-inline: -4px;
  }

  .calendar-head,
  .calendar-grid {
    min-width: 0;
  }

  .calendar-head {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px;
  }

  .calendar-tools {
    width: 100%;
    justify-content: space-between;
  }

  .calendar-legend {
    display: none;
  }

  .calendar-weekday {
    min-height: 34px;
    font-size: 11px;
  }

  .calendar-day {
    min-height: 76px;
    padding: 6px;
    gap: 5px;
  }

  .calendar-date {
    width: 24px;
    height: 24px;
    font-size: 12px;
  }

  .calendar-events {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
  }

  .calendar-event {
    width: 10px;
    height: 10px;
    min-height: 10px;
    display: block;
    padding: 0;
    border: 0;
    border-radius: 999px;
    background: var(--blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
  }

  .calendar-event-dot {
    width: 10px;
    height: 10px;
    display: block;
  }

  .calendar-event-time,
  .calendar-event-title,
  .calendar-more {
    display: none;
  }

  .preview-topbar {
    min-height: auto;
    padding: 10px;
  }

  .preview-stage {
    padding: 8px;
  }

  .preview-image,
  .preview-frame {
    max-height: calc(100vh - 86px);
  }
}

/* Final dark theme contrast layer. Keep this at the end so it wins over page and mobile rules. */
body[data-theme="dark"] {
  --bg: #070b14;
  --surface: #111827;
  --surface-soft: #182235;
  --text: #e7edf8;
  --heading: #ffffff;
  --muted: #c0cadb;
  --line: #334155;
  --line-soft: #263449;
  --blue: #60a5fa;
  --blue-strong: #bfdbfe;
  --blue-soft: #172c4d;
  color: var(--text);
  background:
    radial-gradient(circle at 16px 16px, rgba(96, 165, 250, 0.12) 0 2px, transparent 3px),
    linear-gradient(135deg, rgba(96, 165, 250, 0.08), transparent 34%),
    linear-gradient(315deg, rgba(251, 113, 133, 0.06), transparent 38%),
    var(--bg);
}

body[data-theme="dark"] .sidebar,
body[data-theme="dark"] .login-panel,
body[data-theme="dark"] .card,
body[data-theme="dark"] .metric,
body[data-theme="dark"] .lesson,
body[data-theme="dark"] .group-card,
body[data-theme="dark"] .assignment-student-card,
body[data-theme="dark"] .subpanel,
body[data-theme="dark"] .attachment-item,
body[data-theme="dark"] .calendar-board,
body[data-theme="dark"] .calendar-detail-card,
body[data-theme="dark"] .calendar-upcoming-card,
body[data-theme="dark"] .calendar-week-summary,
body[data-theme="dark"] .calendar-controlbar .icon-btn,
body[data-theme="dark"] .calendar-today,
body[data-theme="dark"] .calendar-filter-btn,
body[data-theme="dark"] .calendar-view-tabs,
body[data-theme="dark"] .calendar-filterbar,
body[data-theme="dark"] .modal,
body[data-theme="dark"] .lesson-expanded,
body[data-theme="dark"] .profile-avatar-panel,
body[data-theme="dark"] .teacher-comment,
body[data-theme="dark"] .score-summary,
body[data-theme="dark"] .sidebar-account,
body[data-theme="dark"] .theme-trigger,
body[data-theme="dark"] .theme-menu {
  color: var(--text);
  background-color: var(--surface);
  border-color: var(--line);
}

body[data-theme="dark"] .input,
body[data-theme="dark"] .select,
body[data-theme="dark"] .textarea,
body[data-theme="dark"] .calendar-filterbar .input,
body[data-theme="dark"] .calendar-filterbar .select {
  color: #f8fafc;
  background: #0f172a;
  border-color: #475569;
}

body[data-theme="dark"] .input::placeholder,
body[data-theme="dark"] .textarea::placeholder {
  color: #94a3b8;
}

body[data-theme="dark"] h1,
body[data-theme="dark"] h2,
body[data-theme="dark"] h3,
body[data-theme="dark"] h4,
body[data-theme="dark"] strong,
body[data-theme="dark"] b,
body[data-theme="dark"] label,
body[data-theme="dark"] .brand h1,
body[data-theme="dark"] .card h3,
body[data-theme="dark"] .metric strong,
body[data-theme="dark"] .dashboard-info-card h3,
body[data-theme="dark"] .calendar-page-title h2,
body[data-theme="dark"] .calendar-month-label strong,
body[data-theme="dark"] .calendar-detail-topic strong,
body[data-theme="dark"] .selected-day-lesson strong,
body[data-theme="dark"] .calendar-upcoming-item strong,
body[data-theme="dark"] .calendar-upcoming-item b,
body[data-theme="dark"] .day-board-head strong,
body[data-theme="dark"] .week-column-head strong,
body[data-theme="dark"] .sidebar-account strong,
body[data-theme="dark"] .theme-title strong {
  color: var(--heading);
}

body[data-theme="dark"] p,
body[data-theme="dark"] .hint,
body[data-theme="dark"] .muted,
body[data-theme="dark"] .hero-copy p,
body[data-theme="dark"] .dashboard-home .hero-copy p,
body[data-theme="dark"] .metric .muted,
body[data-theme="dark"] .calendar-detail-list,
body[data-theme="dark"] .calendar-detail-topic span,
body[data-theme="dark"] .calendar-detail-notes span,
body[data-theme="dark"] .calendar-detail-notes p,
body[data-theme="dark"] .calendar-upcoming-item span,
body[data-theme="dark"] .selected-day-lesson span:not(.badge),
body[data-theme="dark"] .day-agenda-item span:not(.badge),
body[data-theme="dark"] .day-agenda-item em,
body[data-theme="dark"] .calendar-week-summary p,
body[data-theme="dark"] .week-column-head,
body[data-theme="dark"] .calendar-page .calendar-weekday,
body[data-theme="dark"] .theme-title small {
  color: var(--muted);
}

body[data-theme="dark"] .nav button {
  color: #dbeafe;
}

body[data-theme="dark"] .nav-icon {
  color: #bfdbfe;
  background: #172c4d;
  border-color: #2f4d76;
}

body[data-theme="dark"] .nav button.active,
body[data-theme="dark"] .nav button:hover,
body[data-theme="dark"] .calendar-view-tabs button.active,
body[data-theme="dark"] .calendar-filter-btn.active {
  color: #ffffff;
  background: #1d4ed8;
}

body[data-theme="dark"] .nav button.active .nav-icon,
body[data-theme="dark"] .nav button:hover .nav-icon {
  color: #0f172a;
  background: #bfdbfe;
  border-color: #bfdbfe;
}

body[data-theme="dark"] .btn {
  color: #ffffff;
  background: #2563eb;
}

body[data-theme="dark"] .btn.secondary,
body[data-theme="dark"] .tool-btn {
  color: #e7edf8;
  background: #172033;
  border-color: #475569;
}

body[data-theme="dark"] .badge {
  color: #f8fafc;
  border-color: rgba(255, 255, 255, 0.12);
}

body[data-theme="dark"] .calendar-page .calendar-grid {
  background: #334155;
  border-color: #334155;
}

body[data-theme="dark"] .calendar-page .calendar-day,
body[data-theme="dark"] .calendar-page .calendar-weekday,
body[data-theme="dark"] .week-column,
body[data-theme="dark"] .calendar-day-board {
  color: var(--text);
  background:
    linear-gradient(135deg, rgba(96, 165, 250, 0.06), rgba(15, 23, 42, 0.96)),
    #111827;
  border-color: #334155;
}

body[data-theme="dark"] .calendar-day-number,
body[data-theme="dark"] .week-column-head strong {
  color: #ffffff;
  background: #1e3a5f;
}

body[data-theme="dark"] .calendar-page .calendar-event,
body[data-theme="dark"] .selected-day-lesson,
body[data-theme="dark"] .day-agenda-item {
  color: #f8fafc;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--event-color) 56%, #0f172a), color-mix(in srgb, var(--event-color) 24%, #111827));
  border-color: color-mix(in srgb, var(--event-color) 74%, #64748b);
}

body[data-theme="dark"] .calendar-page .calendar-event-title,
body[data-theme="dark"] .calendar-page .calendar-event-time,
body[data-theme="dark"] .day-agenda-item span,
body[data-theme="dark"] .selected-day-lesson strong {
  color: #ffffff;
}

body[data-theme="dark"] .calendar-page .calendar-event.conducted,
body[data-theme="dark"] .selected-day-lesson.conducted,
body[data-theme="dark"] .day-agenda-item.conducted,
body[data-theme="dark"] .calendar-upcoming-item.conducted {
  color: #d1d8e5;
  background:
    repeating-linear-gradient(-45deg, rgba(148, 163, 184, 0.16) 0 8px, transparent 8px 16px),
    #202938;
  border-color: #64748b;
  filter: saturate(0.7);
}

body[data-theme="dark"] .mobile-menu-button {
  background: #111827;
  border-color: #475569;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.32);
}

body[data-theme="dark"] .mobile-menu-button span {
  background: #ffffff;
}

body[data-theme="dark"] .progress-dial::before,
body[data-theme="dark"] .progress-highlight-row,
body[data-theme="dark"] .progress-status-row,
body[data-theme="dark"] .progress-result-row,
body[data-theme="dark"] .progress-empty {
  background: rgba(17, 27, 44, 0.88);
  border-color: rgba(148, 163, 184, 0.28);
}

body[data-theme="dark"] .progress-dial {
  background:
    conic-gradient(#60a5fa var(--value), #223044 0),
    #223044;
}

body[data-theme="dark"] .progress-overview-copy p,
body[data-theme="dark"] .progress-dial span,
body[data-theme="dark"] .progress-highlight-row span,
body[data-theme="dark"] .progress-status-row span,
body[data-theme="dark"] .progress-chart-column small,
body[data-theme="dark"] .progress-result-score span,
body[data-theme="dark"] .progress-empty {
  color: #cbd5e1;
}

body[data-theme="dark"] .progress-teacher-note {
  color: #dbeafe;
  background: rgba(37, 99, 235, 0.18);
  border-color: #60a5fa;
}

body[data-theme="dark"] .progress-result-score strong {
  color: #1e3a8a;
}

body[data-theme="pink"] .progress-dial {
  background:
    conic-gradient(#ec4899 var(--value), #f8dbe9 0),
    #f8dbe9;
}

body[data-theme="pink"] .progress-chart-bar.low {
  background: linear-gradient(180deg, #ff7a70, #dc3c3c);
}

body[data-theme="pink"] .progress-chart-bar.mid {
  background: linear-gradient(180deg, #f5a84c, #ea8a2f);
}

body[data-theme="pink"] .progress-chart-bar.good {
  background: linear-gradient(180deg, #52d4aa, #1d9a74);
}

@media (max-width: 820px) {
  .progress-overview-card {
    grid-template-columns: 1fr;
  }

  .progress-dial {
    width: min(240px, 100%);
    margin: 0 auto;
  }

  .progress-highlight-row,
  .progress-result-row {
    grid-template-columns: 1fr;
  }

  .progress-result-score {
    width: 100%;
    justify-items: start;
  }

}

/* Keep light pills readable in dark theme. This must stay last. */
body[data-theme="dark"] .student-work-stats span,
body[data-theme="dark"] .group-members span,
body[data-theme="dark"] .badge,
body[data-theme="dark"] .nav-badge,
body[data-theme="dark"] .score-summary b,
body[data-theme="dark"] .conducted-mark {
  color: #1e293b;
  background: #f8fafc;
  border-color: #cbd5e1;
}

body[data-theme="dark"] .badge.new,
body[data-theme="dark"] .badge.assigned {
  color: #123b7a;
  background: #dbeafe;
  border-color: #93c5fd;
}

body[data-theme="dark"] .badge.submitted,
body[data-theme="dark"] .badge.reviewing,
body[data-theme="dark"] .badge.revision {
  color: #713f12;
  background: #fef3c7;
  border-color: #fbbf24;
}

body[data-theme="dark"] .badge.checked {
  color: #14532d;
  background: #dcfce7;
  border-color: #86efac;
}

body[data-theme="dark"] .badge.overdue {
  color: #7f1d1d;
  background: #fee2e2;
  border-color: #fca5a5;
}

body[data-theme="dark"] .sidebar-toggle,
body[data-theme="dark"] .close-side,
body[data-theme="dark"] .calendar-mini-icon {
  color: #e7edf8;
  background: #172033;
  border-color: #475569;
}

body[data-theme="dark"] .student-work-stats span,
body[data-theme="dark"] .group-members span,
body[data-theme="dark"] .badge,
body[data-theme="dark"] .nav-badge,
body[data-theme="dark"] .score-summary b,
body[data-theme="dark"] .conducted-mark {
  color: #1e293b;
  background: #f8fafc;
  border-color: #cbd5e1;
}

body[data-theme="dark"] .badge.new,
body[data-theme="dark"] .badge.assigned {
  color: #123b7a;
  background: #dbeafe;
  border-color: #93c5fd;
}

body[data-theme="dark"] .badge.submitted,
body[data-theme="dark"] .badge.reviewing,
body[data-theme="dark"] .badge.revision {
  color: #713f12;
  background: #fef3c7;
  border-color: #fbbf24;
}

body[data-theme="dark"] .badge.checked {
  color: #14532d;
  background: #dcfce7;
  border-color: #86efac;
}

body[data-theme="dark"] .badge.overdue {
  color: #7f1d1d;
  background: #fee2e2;
  border-color: #fca5a5;
}

body[data-theme="dark"] .student-work-stats .btn,
body[data-theme="dark"] .group-members .btn {
  color: #e7edf8;
  background: #172033;
  border-color: #475569;
}

body[data-theme="dark"] .student-work-stats span {
  color: #1e293b;
  background: #f8fafc;
  border: 1px solid #cbd5e1;
}

body[data-theme="dark"] .mobile-sidebar-backdrop {
  background: rgba(2, 6, 23, 0.62);
}

body[data-theme="dark"] {
  --bg: #070b14;
  --surface: #111827;
  --surface-soft: #182235;
  --text: #e7edf8;
  --heading: #ffffff;
  --muted: #bac7da;
  --line: #334155;
  --line-soft: #263449;
  --blue: #60a5fa;
  --blue-strong: #93c5fd;
  --blue-soft: #172c4d;
  --green: #5ee0a5;
  --green-soft: #123628;
  --amber: #fbbf24;
  --amber-soft: #3d2b10;
  --red: #fb7185;
  --red-soft: #421923;
  --violet: #c4b5fd;
  --violet-soft: #2f2555;
  background:
    radial-gradient(circle at 16px 16px, rgba(96, 165, 250, 0.12) 0 2px, transparent 3px),
    linear-gradient(135deg, rgba(96, 165, 250, 0.08), transparent 34%),
    linear-gradient(315deg, rgba(251, 113, 133, 0.06), transparent 38%),
    var(--bg);
  color: var(--text);
}

body[data-theme="dark"] .main,
body[data-theme="dark"] .content {
  color: var(--text);
}

body[data-theme="dark"] .sidebar,
body[data-theme="dark"] .login-panel,
body[data-theme="dark"] .card,
body[data-theme="dark"] .metric,
body[data-theme="dark"] .lesson,
body[data-theme="dark"] .group-card,
body[data-theme="dark"] .assignment-student-card,
body[data-theme="dark"] .subpanel,
body[data-theme="dark"] .attachment-item,
body[data-theme="dark"] .calendar-board,
body[data-theme="dark"] .calendar-detail-card,
body[data-theme="dark"] .calendar-upcoming-card,
body[data-theme="dark"] .calendar-week-summary,
body[data-theme="dark"] .calendar-controlbar .icon-btn,
body[data-theme="dark"] .calendar-today,
body[data-theme="dark"] .calendar-filter-btn,
body[data-theme="dark"] .calendar-view-tabs,
body[data-theme="dark"] .calendar-filterbar,
body[data-theme="dark"] .modal,
body[data-theme="dark"] .lesson-expanded,
body[data-theme="dark"] .profile-avatar-panel,
body[data-theme="dark"] .teacher-comment,
body[data-theme="dark"] .score-summary,
body[data-theme="dark"] .sidebar-account,
body[data-theme="dark"] .theme-trigger,
body[data-theme="dark"] .theme-menu {
  color: var(--text);
  background-color: var(--surface);
  border-color: var(--line);
}

body[data-theme="dark"] .input,
body[data-theme="dark"] .select,
body[data-theme="dark"] .textarea,
body[data-theme="dark"] .calendar-filterbar .input,
body[data-theme="dark"] .calendar-filterbar .select {
  color: #f8fafc;
  background: #0f172a;
  border-color: #475569;
}

body[data-theme="dark"] .input::placeholder,
body[data-theme="dark"] .textarea::placeholder {
  color: #94a3b8;
}

body[data-theme="dark"] h1,
body[data-theme="dark"] h2,
body[data-theme="dark"] h3,
body[data-theme="dark"] h4,
body[data-theme="dark"] strong,
body[data-theme="dark"] b,
body[data-theme="dark"] label,
body[data-theme="dark"] .brand h1,
body[data-theme="dark"] .card h3,
body[data-theme="dark"] .metric strong,
body[data-theme="dark"] .dashboard-info-card h3,
body[data-theme="dark"] .calendar-page-title h2,
body[data-theme="dark"] .calendar-month-label strong,
body[data-theme="dark"] .calendar-detail-topic strong,
body[data-theme="dark"] .selected-day-lesson strong,
body[data-theme="dark"] .calendar-upcoming-item strong,
body[data-theme="dark"] .calendar-upcoming-item b,
body[data-theme="dark"] .day-board-head strong,
body[data-theme="dark"] .week-column-head strong,
body[data-theme="dark"] .calendar-page .calendar-day strong,
body[data-theme="dark"] .sidebar-account strong,
body[data-theme="dark"] .theme-title strong {
  color: var(--heading);
}

body[data-theme="dark"] p,
body[data-theme="dark"] span,
body[data-theme="dark"] .hint,
body[data-theme="dark"] .muted,
body[data-theme="dark"] .hero-copy p,
body[data-theme="dark"] .dashboard-home .hero-copy p,
body[data-theme="dark"] .metric .muted,
body[data-theme="dark"] .calendar-detail-list,
body[data-theme="dark"] .calendar-detail-topic span,
body[data-theme="dark"] .calendar-detail-notes span,
body[data-theme="dark"] .calendar-detail-notes p,
body[data-theme="dark"] .calendar-upcoming-item span,
body[data-theme="dark"] .selected-day-lesson span:not(.badge),
body[data-theme="dark"] .day-agenda-item span:not(.badge),
body[data-theme="dark"] .day-agenda-item em,
body[data-theme="dark"] .calendar-week-summary p,
body[data-theme="dark"] .week-column-head,
body[data-theme="dark"] .calendar-page .calendar-weekday,
body[data-theme="dark"] .theme-title small {
  color: var(--muted);
}

body[data-theme="dark"] .nav button {
  color: #dbeafe;
}

body[data-theme="dark"] .nav-icon {
  color: #bfdbfe;
  background: #172c4d;
  border-color: #2f4d76;
}

body[data-theme="dark"] .nav button.active,
body[data-theme="dark"] .nav button:hover,
body[data-theme="dark"] .calendar-view-tabs button.active,
body[data-theme="dark"] .calendar-filter-btn.active {
  color: #ffffff;
  background: #1d4ed8;
}

body[data-theme="dark"] .nav button.active .nav-icon,
body[data-theme="dark"] .nav button:hover .nav-icon {
  color: #0f172a;
  background: #bfdbfe;
  border-color: #bfdbfe;
}

body[data-theme="dark"] .btn {
  color: #ffffff;
  background: #2563eb;
}

body[data-theme="dark"] .btn.secondary,
body[data-theme="dark"] .tool-btn {
  color: #e7edf8;
  background: #172033;
  border-color: #475569;
}

body[data-theme="dark"] .badge {
  color: #f8fafc;
  border-color: rgba(255, 255, 255, 0.12);
}

body[data-theme="dark"] .calendar-page .calendar-grid {
  background: #334155;
  border-color: #334155;
}

body[data-theme="dark"] .calendar-page .calendar-day,
body[data-theme="dark"] .calendar-page .calendar-weekday,
body[data-theme="dark"] .week-column,
body[data-theme="dark"] .calendar-day-board {
  color: var(--text);
  background:
    linear-gradient(135deg, rgba(96, 165, 250, 0.06), rgba(15, 23, 42, 0.96)),
    #111827;
  border-color: #334155;
}

body[data-theme="dark"] .calendar-page .calendar-day:hover,
body[data-theme="dark"] .week-column[role="button"]:hover {
  background:
    linear-gradient(135deg, rgba(96, 165, 250, 0.12), rgba(15, 23, 42, 0.98)),
    #172033;
}

body[data-theme="dark"] .calendar-day-number,
body[data-theme="dark"] .week-column-head strong {
  color: #ffffff;
  background: #1e3a5f;
}

body[data-theme="dark"] .calendar-day.muted .calendar-day-number,
body[data-theme="dark"] .calendar-page .calendar-day.muted {
  color: #94a3b8;
}

body[data-theme="dark"] .calendar-page .calendar-event,
body[data-theme="dark"] .selected-day-lesson,
body[data-theme="dark"] .day-agenda-item {
  color: #f8fafc;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--event-color) 56%, #0f172a), color-mix(in srgb, var(--event-color) 24%, #111827));
  border-color: color-mix(in srgb, var(--event-color) 74%, #64748b);
}

body[data-theme="dark"] .calendar-page .calendar-event-title,
body[data-theme="dark"] .calendar-page .calendar-event-time,
body[data-theme="dark"] .day-agenda-item span,
body[data-theme="dark"] .selected-day-lesson strong {
  color: #ffffff;
}

body[data-theme="dark"] .calendar-page .calendar-event.conducted,
body[data-theme="dark"] .selected-day-lesson.conducted,
body[data-theme="dark"] .day-agenda-item.conducted,
body[data-theme="dark"] .calendar-upcoming-item.conducted {
  color: #d1d8e5;
  background:
    repeating-linear-gradient(-45deg, rgba(148, 163, 184, 0.16) 0 8px, transparent 8px 16px),
    #202938;
  border-color: #64748b;
  filter: saturate(0.7);
}

body[data-theme="dark"] .mobile-menu-button {
  background: #111827;
  border-color: #475569;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.32);
}

body[data-theme="dark"] .mobile-menu-button span {
  background: #ffffff;
}

body[data-theme="dark"] .mobile-sidebar-backdrop {
  background: rgba(2, 6, 23, 0.62);
}

/* Reference-inspired visual system */
:root {
  --bg: #f6f8fc;
  --bg-ink: rgba(37, 99, 235, 0.045);
  --surface: #ffffff;
  --surface-soft: #f8fbff;
  --text: #1f2a44;
  --heading: #101828;
  --muted: #667085;
  --line: #e6edf7;
  --line-soft: #f0f4fb;
  --blue: #1267f3;
  --blue-strong: #0b4fc7;
  --blue-soft: #eaf2ff;
  --green: #16a36b;
  --green-soft: #eaf8f1;
  --amber: #f59e0b;
  --amber-soft: #fff6df;
  --red: #ef4444;
  --red-soft: #fff0f0;
  --violet: #7b61ff;
  --violet-soft: #f1eeff;
  --coral: #ff8a4c;
  --mint: #23b88f;
  --ink-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow: 0 22px 56px rgba(16, 24, 40, 0.1);
  --shadow-sm: 0 10px 28px rgba(16, 24, 40, 0.06);
}

body {
  background:
    radial-gradient(circle at 12% 12%, rgba(18, 103, 243, 0.08), transparent 28%),
    radial-gradient(circle at 78% 22%, rgba(123, 97, 255, 0.07), transparent 24%),
    linear-gradient(180deg, #f8fbff, #f5f7fb);
}

body[data-theme="dark"] {
  --bg: #0e1422;
  --bg-ink: rgba(125, 164, 255, 0.08);
  --surface: #151c2d;
  --surface-soft: #101827;
  --text: #d7deec;
  --heading: #f7f9ff;
  --muted: #9aa7bd;
  --line: #2c3a52;
  --line-soft: #202b3d;
  --blue: #7da4ff;
  --blue-strong: #a8c0ff;
  --blue-soft: #1e2c48;
  --green: #5ee0a8;
  --green-soft: #143427;
  --amber: #f6c66b;
  --amber-soft: #3a2a12;
  --red: #ff7f7f;
  --red-soft: #3a1e24;
  --violet: #b9a7ff;
  --violet-soft: #2a2444;
  --coral: #ff9b8a;
  --mint: #58d5b4;
  --ink-shadow: 0 1px 1px rgba(0, 0, 0, 0.24);
  --shadow: 0 24px 58px rgba(0, 0, 0, 0.34);
  --shadow-sm: 0 12px 30px rgba(0, 0, 0, 0.24);
  background:
    radial-gradient(circle at 12% 12%, rgba(125, 164, 255, 0.15), transparent 28%),
    radial-gradient(circle at 78% 22%, rgba(185, 167, 255, 0.12), transparent 24%),
    linear-gradient(180deg, #0f1728, #0b1020);
}

body[data-theme="pink"] {
  --bg: #fff4fa;
  --bg-ink: rgba(236, 72, 153, 0.07);
  --surface: #ffffff;
  --surface-soft: #fff7fb;
  --text: #493044;
  --heading: #2b1727;
  --muted: #8a667d;
  --line: #f4d7e7;
  --line-soft: #fae8f2;
  --blue: #e84f9f;
  --blue-strong: #bf2d7a;
  --blue-soft: #ffe5f2;
  --green: #20a884;
  --green-soft: #e7fbf4;
  --amber: #f59e0b;
  --amber-soft: #fff3d8;
  --red: #ef4475;
  --red-soft: #ffeaf1;
  --violet: #a855f7;
  --violet-soft: #f5e8ff;
  --coral: #ff6f91;
  --mint: #4cc9b0;
  --ink-shadow: 0 1px 2px rgba(120, 38, 84, 0.06);
  --shadow: 0 24px 58px rgba(168, 45, 110, 0.15);
  --shadow-sm: 0 12px 30px rgba(168, 45, 110, 0.09);
  background:
    radial-gradient(circle at 12% 12%, rgba(236, 72, 153, 0.14), transparent 28%),
    radial-gradient(circle at 78% 22%, rgba(168, 85, 247, 0.11), transparent 24%),
    linear-gradient(180deg, #fff7fb, #fff0f7);
}

.login-shell {
  background:
    radial-gradient(circle at 22% 16%, rgba(18, 103, 243, 0.1), transparent 26%),
    radial-gradient(circle at 82% 76%, rgba(35, 184, 143, 0.09), transparent 26%),
    #f8fbff;
}

.login-panel,
.card,
.calendar-board,
.modal,
.lesson-expanded {
  background: rgba(255, 255, 255, 0.96);
  border-color: var(--line);
  box-shadow: 0 18px 45px rgba(16, 24, 40, 0.07);
}

.login-panel::before {
  color: rgba(18, 103, 243, 0.12);
}

.login-panel::after {
  background: rgba(18, 103, 243, 0.08);
}

.sidebar {
  background:
    radial-gradient(circle at 36px 40px, rgba(18, 103, 243, 0.08), transparent 72px),
    rgba(255, 255, 255, 0.96);
  border-right-color: var(--line);
  box-shadow: 12px 0 34px rgba(16, 24, 40, 0.045);
}

.sidebar-note {
  border-color: #dbe8ff;
  background: linear-gradient(135deg, #f3f8ff, #ffffff);
  color: #33527d;
}

.brand h1 {
  font-size: 18px;
  line-height: 1.1;
}

.nav button {
  color: #526071;
  padding-left: 13px;
}

.nav button:hover {
  background: #f2f7ff;
  color: var(--blue);
}

.nav button.active {
  background: #eef5ff;
  color: var(--blue);
  box-shadow: none;
}

.nav button.active::before {
  background: var(--blue);
}

.topbar {
  background: rgba(248, 251, 255, 0.84);
  border-bottom-color: var(--line);
}

.btn {
  background: linear-gradient(135deg, #1267f3, #0b5be8);
  box-shadow: 0 12px 24px rgba(18, 103, 243, 0.2);
}

.btn:hover {
  background: linear-gradient(135deg, #0b4fc7, #1267f3);
}

.btn.secondary {
  background: #ffffff;
  border-color: var(--line);
}

.input,
.select,
.textarea {
  background: #fbfdff;
  border-color: var(--line);
}

.input:focus,
.select:focus,
.textarea:focus {
  border-color: rgba(18, 103, 243, 0.58);
  box-shadow: 0 0 0 4px rgba(18, 103, 243, 0.1);
}

.metric {
  border-color: var(--line);
}

.metric::before {
  color: rgba(18, 103, 243, 0.09);
}

.metric::after {
  background: linear-gradient(90deg, var(--blue), #79a9ff);
}

.badge.submitted,
.badge.reviewing {
  color: #a45b00;
  background: var(--amber-soft);
  border-color: #ffe4ad;
}

.badge.checked {
  color: #087443;
  background: var(--green-soft);
  border-color: #cdeedd;
}

.calendar-head {
  background: linear-gradient(90deg, #f8fbff, #ffffff);
}

.calendar-day.has-events {
  background:
    linear-gradient(180deg, rgba(18, 103, 243, 0.045), transparent 38%),
    #ffffff;
}

.lesson {
  border-left-color: var(--blue);
  background:
    linear-gradient(90deg, rgba(18, 103, 243, 0.055), transparent 34%),
    #ffffff;
}

.lesson:hover {
  border-left-color: var(--green);
}

.mascot {
  filter: drop-shadow(0 12px 18px rgba(18, 103, 243, 0.16));
}

.mascot.small {
  width: 46px;
  height: 46px;
}

.mascot.large {
  width: 112px;
  height: 112px;
}

.mascot.tiny {
  width: 34px;
  height: 34px;
}

.mascot-face,
.mascot-spark {
  display: none;
}

.owl-body {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50% 50% 46% 46%;
  background:
    radial-gradient(circle at 38% 63%, rgba(255, 255, 255, 0.75), transparent 16%),
    radial-gradient(circle at 62% 63%, rgba(255, 255, 255, 0.7), transparent 16%),
    linear-gradient(180deg, #ffffff 0%, #f4f8ff 58%, #dfeaff 100%);
  border: 2px solid #d7e6ff;
  box-shadow: inset 0 -10px 18px rgba(18, 103, 243, 0.08);
}

.owl-ear {
  position: absolute;
  top: -5%;
  width: 26%;
  height: 28%;
  background: #ffffff;
  border-top: 2px solid #d7e6ff;
}

.owl-ear.left {
  left: 16%;
  border-radius: 70% 20% 60% 20%;
  transform: rotate(-28deg);
}

.owl-ear.right {
  right: 16%;
  border-radius: 20% 70% 20% 60%;
  transform: rotate(28deg);
}

.owl-wing {
  position: absolute;
  bottom: 18%;
  width: 20%;
  height: 34%;
  background: linear-gradient(180deg, #7eb0ff, #1267f3);
  opacity: 0.95;
}

.owl-wing.left {
  left: -6%;
  border-radius: 70% 30% 70% 40%;
  transform: rotate(18deg);
}

.owl-wing.right {
  right: -6%;
  border-radius: 30% 70% 40% 70%;
  transform: rotate(-18deg);
}

.owl-eye {
  position: absolute;
  top: 28%;
  width: 34%;
  height: 34%;
  border: 4px solid #1267f3;
  border-radius: 50%;
  background: #ffffff;
}

.mascot.tiny .owl-eye {
  border-width: 2px;
}

.owl-eye.left {
  left: 16%;
}

.owl-eye.right {
  right: 16%;
}

.owl-eye::after {
  content: "";
  position: absolute;
  top: 48%;
  width: 19%;
  height: 4px;
  background: #1267f3;
}

.owl-eye.left::after {
  right: -22%;
}

.owl-eye.right::after {
  left: -22%;
}

.owl-eye i {
  position: absolute;
  left: 34%;
  top: 30%;
  width: 36%;
  height: 40%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 68% 24%, #ffffff 0 18%, transparent 19%),
    #111827;
}

.owl-beak {
  position: absolute;
  left: 44%;
  top: 58%;
  width: 12%;
  height: 12%;
  background: #f6b94c;
  clip-path: polygon(50% 100%, 0 0, 100% 0);
}

.owl-scarf {
  position: absolute;
  left: 24%;
  right: 24%;
  bottom: 14%;
  height: 14%;
  border-radius: 999px;
  background: linear-gradient(90deg, #1267f3, #6aa0ff);
}

.owl-badge {
  position: absolute;
  right: 18%;
  bottom: 5%;
  min-width: 24%;
  height: 22%;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: #4f7fff;
  color: #ffffff;
  font-size: 18%;
  font-weight: 900;
  box-shadow: 0 4px 10px rgba(18, 103, 243, 0.24);
}

.mascot.tiny .owl-badge {
  display: none;
}

/* Closer to the provided dashboard reference */
.app-shell {
  display: grid;
  grid-template-columns: 316px minmax(0, 1fr);
  gap: 16px;
  min-height: 100vh;
  padding: 18px;
  transition: grid-template-columns 180ms ease;
}

.app-shell.sidebar-collapsed {
  grid-template-columns: 88px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 18px;
  height: calc(100vh - 36px);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px 14px;
  box-shadow: 0 18px 46px rgba(16, 24, 40, 0.07);
  display: flex;
  flex-direction: column;
  transition: width 180ms ease, padding 180ms ease;
}

.sidebar-toggle {
  position: absolute;
  right: -14px;
  top: 22px;
  z-index: 2;
  width: 36px;
  height: 36px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  border: 1px solid #dbe8ff;
  border-radius: 999px;
  color: var(--blue);
  background: #ffffff;
  box-shadow: 0 12px 24px rgba(16, 24, 40, 0.1);
  font-size: 22px;
  font-weight: 900;
  line-height: 1;
}

.sidebar-toggle span {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  line-height: 1;
  transform: translateY(-1px);
}

.sidebar-toggle:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px rgba(16, 24, 40, 0.13);
}

.mobile-menu-button,
.mobile-sidebar-backdrop {
  display: none;
}

.brand {
  align-items: center;
  gap: 12px;
  padding: 0 4px 16px;
}

.brand h1 {
  color: var(--heading);
  letter-spacing: 0;
  font-size: 22px;
}

.sidebar-account {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 14px;
  padding: 13px 12px;
  border: 1px solid #dbe8ff;
  border-radius: 8px;
  background: linear-gradient(135deg, #f7fbff, #ffffff);
}

.sidebar-account-link {
  cursor: pointer;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.sidebar-account-link:hover,
.sidebar-account-link:focus-visible {
  border-color: #a8c8ff;
  box-shadow: 0 14px 30px rgba(18, 103, 243, 0.12);
  transform: translateY(-1px);
  outline: none;
}

.sidebar-account strong {
  display: block;
  color: var(--heading);
  font-size: 16px;
  line-height: 1.25;
}

.account-avatar {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 8px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--blue), #79a9ff);
  font-size: 14px;
  font-weight: 900;
  box-shadow: 0 10px 22px rgba(18, 103, 243, 0.2);
  overflow: hidden;
}

.account-avatar img,
.profile-avatar-preview img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.neutral-account .account-avatar {
  background: linear-gradient(135deg, #8fb7ff, var(--blue));
}

.sidebar-note {
  margin: 2px 0 18px;
  padding: 12px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.35;
}

.nav {
  gap: 5px;
}

.nav button {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 52px;
  border-radius: 8px;
  padding: 12px 14px;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0;
}

.nav button::before {
  display: none;
}

.nav-icon {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 7px;
  color: #6b7b93;
  background: #f3f7ff;
  border: 1px solid #e4edfb;
  font-size: 15px;
  line-height: 1;
}

.nav-label {
  min-width: 0;
}

.nav-badge {
  min-width: 22px;
  height: 22px;
  display: inline-grid;
  place-items: center;
  margin-left: auto;
  padding: 0 7px;
  border-radius: 999px;
  color: #ffffff;
  background: var(--blue);
  font-size: 12px;
  font-weight: 900;
  line-height: 1;
  box-shadow: 0 8px 18px rgba(18, 103, 243, 0.2);
}

.nav button.active .nav-badge {
  background: #ffffff;
  color: var(--blue);
}

.sidebar-logout {
  width: 100%;
  margin-top: auto;
  min-height: 48px;
  justify-content: center;
  font-size: 16px;
}

.theme-switcher {
  position: relative;
  margin: 6px 0 10px;
}

.theme-trigger {
  width: 100%;
  min-height: 58px;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid color-mix(in srgb, var(--blue) 16%, var(--line));
  border-radius: 8px;
  color: var(--heading);
  background:
    radial-gradient(circle at 12% 18%, color-mix(in srgb, var(--blue) 14%, transparent), transparent 34%),
    linear-gradient(135deg, #ffffff, var(--surface-soft));
  text-align: left;
  box-shadow: 0 12px 28px rgba(19, 42, 85, 0.06);
}

.theme-trigger:hover,
.theme-switcher.open .theme-trigger {
  border-color: color-mix(in srgb, var(--blue) 34%, var(--line));
  box-shadow: 0 16px 34px color-mix(in srgb, var(--blue) 14%, transparent);
}

.theme-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #ffffff;
  background: var(--blue);
  font-size: 18px;
  font-weight: 900;
  box-shadow: 0 10px 22px color-mix(in srgb, var(--blue) 24%, transparent);
}

.theme-title {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.theme-title small {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.theme-title strong {
  color: var(--heading);
  font-size: 15px;
  font-weight: 900;
}

.theme-chevron {
  color: var(--muted);
  font-size: 18px;
  font-weight: 900;
  transition: transform 0.2s ease;
}

.theme-switcher.open .theme-chevron {
  transform: rotate(180deg);
}

.theme-menu {
  position: absolute;
  z-index: 30;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  display: grid;
  gap: 5px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 18px 40px rgba(19, 42, 85, 0.14);
}

.theme-menu button {
  min-height: 42px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 10px;
  border-radius: 7px;
  color: var(--text);
  background: transparent;
  font-size: 14px;
  font-weight: 900;
}

.theme-menu button span {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  color: var(--blue);
  background: color-mix(in srgb, var(--blue) 10%, #ffffff);
}

.theme-menu button:hover,
.theme-menu button.active {
  color: #ffffff;
  background: var(--blue);
  box-shadow: 0 8px 18px color-mix(in srgb, var(--blue) 24%, transparent);
}

.theme-menu button:hover span,
.theme-menu button.active span {
  color: var(--blue);
  background: #ffffff;
}

.sidebar-collapsed .sidebar {
  align-items: center;
  padding-inline: 12px;
}

.sidebar-collapsed .brand {
  justify-content: center;
  padding-inline: 0;
}

.sidebar-collapsed .brand > div,
.sidebar-collapsed .sidebar-account > div:not(.account-avatar),
.sidebar-collapsed .sidebar-note,
.sidebar-collapsed .nav-label,
.sidebar-collapsed .theme-switcher,
.sidebar-collapsed .sidebar-logout,
.sidebar-collapsed .nav-badge {
  display: none;
}

.sidebar-collapsed .sidebar-account {
  width: 100%;
  justify-content: center;
  padding: 10px;
}

.sidebar-collapsed .nav {
  width: 100%;
}

.sidebar-collapsed .nav button {
  justify-content: center;
  padding-inline: 0;
}

.sidebar-collapsed .nav-icon {
  margin: 0;
}

.nav button.active .nav-icon,
.nav button:hover .nav-icon {
  color: #ffffff;
  background: var(--blue);
  border-color: var(--blue);
  box-shadow: 0 8px 18px rgba(18, 103, 243, 0.18);
}

.main {
  min-width: 0;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 14px;
}

.topbar {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 14px 36px rgba(16, 24, 40, 0.055);
}

.content {
  width: 100%;
  max-width: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.dashboard-hero {
  position: relative;
  overflow: hidden;
  min-height: 154px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    radial-gradient(circle at 86% 12%, rgba(18, 103, 243, 0.12), transparent 24%),
    radial-gradient(circle at 64% 92%, rgba(35, 184, 143, 0.1), transparent 22%),
    linear-gradient(135deg, #ffffff 0%, #f7fbff 52%, #eef6ff 100%);
  box-shadow: 0 20px 50px rgba(16, 24, 40, 0.08);
}

.dashboard-hero::before {
  content: "∫  π  △  f(x)";
  position: absolute;
  right: 188px;
  top: 18px;
  color: rgba(18, 103, 243, 0.15);
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 12px;
  transform: rotate(-4deg);
}

.dashboard-hero::after {
  content: "";
  position: absolute;
  right: 20px;
  bottom: 18px;
  width: 180px;
  height: 62px;
  opacity: 0.42;
  background:
    linear-gradient(135deg, transparent 43%, rgba(18, 103, 243, 0.36) 44% 46%, transparent 47%),
    linear-gradient(20deg, transparent 45%, rgba(35, 184, 143, 0.28) 46% 48%, transparent 49%);
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 690px;
}

.hero-kicker {
  margin-bottom: 7px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}

.hero-copy h2 {
  margin: 0;
  color: var(--heading);
  font-size: 28px;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy p {
  max-width: 640px;
  margin: 9px 0 0;
  color: #62728a;
  font-size: 15px;
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 18px;
}

.hero-visual {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 18px;
  min-width: 230px;
}

.formula-cloud {
  display: grid;
  gap: 9px;
  color: rgba(18, 103, 243, 0.32);
  font-weight: 800;
  font-size: 18px;
  transform: rotate(-4deg);
}

.formula-cloud span:nth-child(2) {
  color: rgba(123, 97, 255, 0.28);
  transform: translateX(16px);
}

.formula-cloud span:nth-child(3) {
  justify-self: end;
  color: rgba(35, 184, 143, 0.32);
}

.grid {
  gap: 16px;
}

.grid.cols-3 {
  grid-template-columns: repeat(3, minmax(180px, 1fr));
}

.grid.cols-2 {
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
}

.grid.cols-1 {
  grid-template-columns: minmax(0, 1fr);
}

.card {
  border-radius: 8px;
  padding: 18px;
}

.card h3 {
  color: var(--heading);
  letter-spacing: 0;
}

.metric {
  position: relative;
  min-height: 112px;
  overflow: hidden;
  justify-content: space-between;
  border-color: var(--line);
}

.metric::before {
  content: "";
  position: absolute;
  right: 16px;
  top: 16px;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: var(--blue-soft);
  border: 1px solid #d8e8ff;
}

.metric::after {
  height: 4px;
  left: 18px;
  right: 18px;
  bottom: 16px;
  border-radius: 999px;
}

.metric strong {
  margin-top: 12px;
  color: var(--heading);
  font-size: 34px;
  line-height: 1;
}

.metric .muted {
  color: #617089;
  font-weight: 700;
}

.metric.violet::before {
  background: var(--violet-soft);
  border-color: #ddd6ff;
}

.metric.violet::after {
  background: linear-gradient(90deg, var(--violet), #b7a8ff);
}

.metric.amber::before {
  background: var(--amber-soft);
  border-color: #ffe0a3;
}

.metric.amber::after {
  background: linear-gradient(90deg, var(--amber), #ffd166);
}

.metric.green::before {
  background: var(--green-soft);
  border-color: #cbeedc;
}

.metric.green::after {
  background: linear-gradient(90deg, var(--green), #72d6a5);
}

body[data-theme="dark"] .sidebar,
body[data-theme="dark"] .login-panel,
body[data-theme="dark"] .card,
body[data-theme="dark"] .calendar-board,
body[data-theme="dark"] .modal,
body[data-theme="dark"] .lesson-expanded,
body[data-theme="dark"] .calendar-controlbar .icon-btn,
body[data-theme="dark"] .calendar-today,
body[data-theme="dark"] .calendar-filter-btn,
body[data-theme="dark"] .calendar-view-tabs,
body[data-theme="dark"] .calendar-filterbar,
body[data-theme="dark"] .calendar-detail-card,
body[data-theme="dark"] .calendar-upcoming-card,
body[data-theme="dark"] .calendar-week-summary,
body[data-theme="dark"] .input,
body[data-theme="dark"] .select,
body[data-theme="dark"] .textarea {
  background-color: var(--surface);
  border-color: var(--line);
  color: var(--text);
}

body[data-theme="dark"] .calendar-page .calendar-day,
body[data-theme="dark"] .calendar-page .calendar-weekday,
body[data-theme="dark"] .week-column,
body[data-theme="dark"] .calendar-day-board,
body[data-theme="dark"] .sidebar-account,
body[data-theme="dark"] .profile-avatar-panel,
body[data-theme="dark"] .teacher-comment,
body[data-theme="dark"] .score-summary {
  background:
    linear-gradient(135deg, rgba(125, 164, 255, 0.055), rgba(21, 28, 45, 0.96)),
    var(--surface);
  border-color: var(--line);
}

body[data-theme="dark"] .sidebar-note,
body[data-theme="dark"] .nav button.active,
body[data-theme="dark"] .nav button:hover,
body[data-theme="dark"] .calendar-view-tabs button.active,
body[data-theme="dark"] .calendar-filter-btn.active {
  background: #1e2c48;
  color: var(--blue-strong);
}

body[data-theme="dark"] .theme-trigger,
body[data-theme="dark"] .theme-menu {
  background:
    radial-gradient(circle at 12% 18%, rgba(96, 165, 250, 0.12), transparent 34%),
    #172033;
  border-color: var(--line);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.22);
}

body[data-theme="dark"] .theme-menu button span {
  background: #223150;
}

body[data-theme="pink"] .sidebar,
body[data-theme="pink"] .login-panel,
body[data-theme="pink"] .card,
body[data-theme="pink"] .calendar-board,
body[data-theme="pink"] .modal,
body[data-theme="pink"] .lesson-expanded {
  border-color: var(--line);
  box-shadow: var(--shadow-sm);
}

body[data-theme="pink"] .sidebar-note,
body[data-theme="pink"] .nav button.active,
body[data-theme="pink"] .nav button:hover,
body[data-theme="pink"] .calendar-view-tabs button.active,
body[data-theme="pink"] .calendar-filter-btn.active {
  background: #ffe5f2;
  color: var(--blue-strong);
}

.dashboard-home {
  display: grid;
  gap: 22px;
}

.dashboard-home .dashboard-hero {
  min-height: 190px;
  padding: 32px 34px;
}

.dashboard-home .hero-kicker {
  font-size: 15px;
}

.dashboard-home .hero-copy h2 {
  font-size: 36px;
  line-height: 1.06;
}

.dashboard-home .hero-copy p {
  max-width: 760px;
  font-size: 18px;
  line-height: 1.6;
}

.dashboard-home .hero-actions {
  gap: 12px;
  margin-top: 22px;
}

.dashboard-home .hero-actions .btn,
.dashboard-home .hero-actions .btn.secondary {
  min-height: 48px;
  padding-inline: 18px;
  font-size: 15px;
}

.dashboard-home .dashboard-metrics {
  gap: 20px;
}

.dashboard-home .metric {
  min-height: 150px;
  padding: 26px;
}

.dashboard-home .metric::before {
  width: 50px;
  height: 50px;
  right: 22px;
  top: 22px;
}

.dashboard-home .metric::after {
  left: 26px;
  right: 26px;
  bottom: 22px;
  height: 5px;
}

.dashboard-home .metric .muted {
  max-width: 70%;
  font-size: 16px;
  line-height: 1.35;
}

.dashboard-home .metric strong {
  margin-top: 18px;
  font-size: 48px;
}

.dashboard-info-grid {
  gap: 20px;
}

.dashboard-info-card {
  min-height: 250px;
  padding: 26px;
}

.dashboard-info-card h3 {
  margin-bottom: 18px;
  font-size: 24px;
  line-height: 1.15;
}

.dashboard-info-card p,
.dashboard-info-card .hint,
.dashboard-info-card .row,
.dashboard-info-card .list {
  font-size: 16px;
}

.dashboard-info-card .lesson {
  padding: 20px;
}

.dashboard-info-card .lesson h3 {
  margin-bottom: 6px;
  font-size: 21px;
}

.dashboard-info-card .lesson p {
  font-size: 16px;
}

.lesson,
.subpanel,
.assignment-student-card {
  border-radius: 8px;
}

.lesson {
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--blue);
  box-shadow: 0 12px 26px rgba(16, 24, 40, 0.045);
}

.lesson:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 34px rgba(16, 24, 40, 0.07);
}

.btn {
  border-radius: 8px;
  font-weight: 800;
}

.btn.secondary {
  color: #31537d;
  box-shadow: 0 8px 18px rgba(16, 24, 40, 0.045);
}

.mascot.large .owl-badge {
  font-size: 14px;
}

.mascot.small .owl-badge {
  font-size: 8px;
}

.mascot.tiny .owl-wing {
  display: none;
}

@media (max-width: 960px) {
  .app-shell,
  .app-shell.sidebar-collapsed {
    grid-template-columns: 1fr;
    padding: 12px;
  }

  .sidebar {
    position: relative;
    top: auto;
    height: auto;
  }

  .sidebar-toggle {
    display: none;
  }

  .sidebar-collapsed .sidebar {
    align-items: stretch;
  }

  .sidebar-collapsed .brand {
    justify-content: flex-start;
  }

  .sidebar-collapsed .brand > div,
  .sidebar-collapsed .sidebar-account > div:not(.account-avatar),
  .sidebar-collapsed .nav-label {
    display: block;
  }

  .sidebar-collapsed .sidebar-note {
    display: flex;
  }

  .sidebar-collapsed .theme-switcher {
    display: grid;
  }

  .sidebar-collapsed .sidebar-logout {
    display: inline-flex;
  }

  .sidebar-collapsed .nav-badge {
    display: inline-grid;
  }

  .sidebar-collapsed .nav button {
    justify-content: flex-start;
    padding-inline: 14px;
  }

  .grid.cols-3,
  .grid.cols-2 {
    grid-template-columns: 1fr;
  }

  .dashboard-hero {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-visual {
    width: 100%;
    justify-content: flex-end;
  }
}

@media (max-width: 620px) {
  .app-shell {
    padding: 0;
    gap: 0;
  }

  .sidebar,
  .topbar,
  .dashboard-hero,
  .card {
    border-radius: 0;
  }

  .dashboard-hero {
    padding: 20px 16px;
  }

  .hero-copy h2 {
    font-size: 24px;
  }

  .hero-visual {
    display: none;
  }
}

/* Calendar page like the product reference */
.calendar-page {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 18px;
  align-items: start;
}

.calendar-page.without-side-panel {
  grid-template-columns: minmax(0, 1fr);
}

.calendar-main-panel,
.calendar-side-panel {
  min-width: 0;
}

.calendar-main-panel {
  display: grid;
  gap: 14px;
}

.calendar-side-panel {
  display: grid;
  gap: 14px;
}

.calendar-titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.calendar-titlebar h2 {
  margin: 0;
  color: var(--heading);
  font-size: 32px;
  line-height: 1.1;
  letter-spacing: 0;
}

.calendar-controlbar,
.calendar-filterbar,
.calendar-detail-card,
.calendar-upcoming-card,
.calendar-week-summary {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 14px 36px rgba(16, 24, 40, 0.055);
}

.calendar-controlbar {
  min-height: 52px;
  display: grid;
  grid-template-columns: auto auto minmax(160px, 1fr) auto auto;
  align-items: center;
  gap: 10px;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.calendar-controlbar .calendar-switcher {
  height: 48px;
  padding: 0;
  gap: 8px;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.calendar-controlbar .icon-btn,
.calendar-today,
.calendar-filter-btn {
  height: 46px;
  border: 1px solid var(--line);
  background: #ffffff;
  box-shadow: 0 10px 24px rgba(16, 24, 40, 0.05);
}

.calendar-controlbar .icon-btn {
  width: 46px;
  border-radius: 8px;
  font-size: 0;
}

.calendar-today {
  padding-inline: 22px;
}

.calendar-filter-btn {
  padding-inline: 18px;
}

.calendar-month-label {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--heading);
  font-size: 18px;
  font-weight: 900;
  text-transform: capitalize;
}

.calendar-mini-icon {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid #dbe8ff;
  border-radius: 8px;
  color: var(--blue);
  background: #f3f8ff;
}

.calendar-view-tabs {
  display: grid;
  grid-template-columns: repeat(3, 82px);
  height: 46px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.calendar-view-tabs button {
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: #65758e;
  font-weight: 800;
}

.calendar-view-tabs button:last-child {
  border-right: 0;
}

.calendar-view-tabs button.active {
  color: var(--blue);
  background: #eef5ff;
}

.calendar-view-tabs button:disabled {
  cursor: default;
  opacity: 0.75;
}

.calendar-filterbar {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr minmax(220px, 1.35fr);
  gap: 0;
  min-height: 54px;
  overflow: hidden;
}

.calendar-filterbar.student-calendar-filters {
  grid-template-columns: minmax(150px, 0.72fr) minmax(160px, 0.72fr) minmax(360px, 1.8fr);
}

.calendar-filterbar.hidden {
  display: none;
}

.calendar-filter-btn.active {
  color: var(--blue);
  background: #eef5ff;
  border-color: #d6e6ff;
}

.calendar-create-btn {
  white-space: nowrap;
}


.calendar-filterbar .select,
.calendar-filterbar .input {
  height: 54px;
  border: 0;
  border-right: 1px solid var(--line);
  border-radius: 0;
  background: #ffffff;
  box-shadow: none;
}

.calendar-search {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: center;
  color: #9aa8bb;
}

.calendar-search span {
  display: grid;
  place-items: center;
  height: 54px;
  border-right: 0;
}

.calendar-search .input {
  border-right: 0;
  min-width: 0;
  text-overflow: clip;
}

.calendar-page .calendar-board {
  border-radius: 8px;
  border-color: #dfe8f6;
  box-shadow: 0 18px 42px rgba(16, 24, 40, 0.06);
}

.calendar-page .calendar-grid {
  gap: 0;
  border: 1px solid #dfe8f6;
  border-top: 0;
  background: #dfe8f6;
}

.calendar-page .calendar-weekday {
  min-height: 44px;
  justify-content: center;
  background: #ffffff;
  color: #60718c;
  text-transform: none;
  font-size: 14px;
  border-bottom: 1px solid #dfe8f6;
}

.calendar-page .calendar-day {
  min-height: 130px;
  border-right: 1px solid #dfe8f6;
  border-bottom: 1px solid #dfe8f6;
  background: #ffffff;
  padding: 11px;
}

.calendar-page .calendar-day:nth-child(7n) {
  border-right: 0;
}

.calendar-page .calendar-day.muted-day {
  background: #fbfdff;
}

.calendar-page .calendar-day.has-events {
  background: #ffffff;
}

.calendar-page .calendar-day.today {
  box-shadow: inset 0 0 0 2px rgba(18, 103, 243, 0.14);
}

.calendar-page .calendar-day.selected-day {
  background:
    linear-gradient(180deg, rgba(18, 103, 243, 0.075), transparent 40%),
    #ffffff;
  box-shadow: inset 0 0 0 2px rgba(18, 103, 243, 0.34);
}

.calendar-page .calendar-date {
  width: 27px;
  height: 27px;
  justify-self: start;
  color: #17233c;
  font-size: 14px;
}

.calendar-page .calendar-day.today .calendar-date {
  background: var(--blue);
  color: #ffffff;
  box-shadow: 0 8px 18px rgba(18, 103, 243, 0.24);
}

.calendar-page .calendar-events {
  gap: 8px;
}

.calendar-page .calendar-event {
  width: 100%;
  min-height: 48px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "dot time"
    ". title"
    ". mark";
  align-items: center;
  gap: 2px 7px;
  padding: 8px 10px;
  border: 1px solid color-mix(in srgb, var(--event-color) 52%, #cfe0ff);
  border-radius: 8px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--event-color) 30%, #ffffff), color-mix(in srgb, var(--event-color) 8%, #ffffff));
  color: color-mix(in srgb, var(--event-color) 86%, #071329);
  text-align: left;
  box-shadow: 0 10px 22px color-mix(in srgb, var(--event-color) 18%, transparent);
  position: relative;
  overflow: hidden;
}

.calendar-page .calendar-event:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 28px color-mix(in srgb, var(--event-color) 24%, transparent);
}

.calendar-page .calendar-event-dot {
  grid-area: dot;
  width: 9px;
  height: 9px;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--event-color) 16%, transparent);
}

.calendar-page .calendar-event-time {
  grid-area: time;
  font-size: 12px;
}

.calendar-page .calendar-event-title {
  grid-area: title;
  color: inherit;
  font-size: 13px;
  font-weight: 900;
}

.conducted-mark {
  grid-area: mark;
  width: max-content;
  margin-top: 2px;
  padding: 2px 6px;
  border-radius: 999px;
  color: #475569;
  background: rgba(148, 163, 184, 0.18);
  font-size: 10px;
  font-weight: 900;
  text-transform: uppercase;
}

.calendar-page .calendar-event.conducted {
  border-color: #aeb9c8;
  background:
    repeating-linear-gradient(-45deg, rgba(100, 116, 139, 0.1) 0 7px, transparent 7px 14px),
    linear-gradient(135deg, color-mix(in srgb, var(--event-color) 6%, #e2e8f0), #f1f5f9);
  color: #475569;
  filter: saturate(0.45);
  box-shadow: inset 0 0 0 1px rgba(100, 116, 139, 0.18);
}

.calendar-page .calendar-event.conducted .calendar-event-dot {
  background: #94a3b8 !important;
  opacity: 1;
}

.calendar-week-board {
  display: grid;
  grid-template-columns: repeat(7, minmax(132px, 1fr));
  min-height: 560px;
  overflow: hidden;
}

.week-column {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
  padding: 14px;
  border-right: 1px solid #dfe8f6;
  background: #ffffff;
}

.week-column:last-child {
  border-right: 0;
}

.week-column[role="button"] {
  cursor: pointer;
}

.week-column[role="button"]:hover {
  background: #f8fbff;
}

.week-column-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #62728a;
  font-weight: 800;
  text-transform: capitalize;
}

.week-column-head strong {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: var(--heading);
  background: #f3f8ff;
}

.week-column-events {
  display: grid;
  align-content: start;
  gap: 10px;
}

.week-column-events p {
  color: #98a6ba;
  font-size: 13px;
}

.calendar-day-board {
  min-height: 560px;
  display: grid;
  grid-template-rows: auto 1fr;
  padding: 22px;
  gap: 18px;
  background: #ffffff;
}

.calendar-day-board[role="button"] {
  cursor: pointer;
}

.day-board-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid #dfe8f6;
}

.day-board-head span {
  color: var(--blue);
  font-weight: 900;
  text-transform: capitalize;
}

.day-board-head strong {
  color: var(--heading);
  font-size: 22px;
}

.day-board-list {
  display: grid;
  align-content: start;
  gap: 12px;
}

.day-agenda-item {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  min-height: 68px;
  padding: 14px 16px;
  border: 1px solid color-mix(in srgb, var(--event-color) 52%, #d8e4f5);
  border-radius: 8px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--event-color) 28%, #ffffff), color-mix(in srgb, var(--event-color) 7%, #ffffff));
  text-align: left;
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 24px color-mix(in srgb, var(--event-color) 15%, transparent);
}

.day-agenda-item span {
  color: color-mix(in srgb, var(--event-color) 86%, #071329);
  font-weight: 900;
}

.day-agenda-item strong {
  color: var(--heading);
}

.day-agenda-item em {
  color: #62728a;
  font-style: normal;
}

.day-agenda-item.conducted {
  border-color: #aeb9c8;
  background:
    repeating-linear-gradient(-45deg, rgba(100, 116, 139, 0.1) 0 8px, transparent 8px 16px),
    linear-gradient(135deg, color-mix(in srgb, var(--event-color) 6%, #e2e8f0), #f1f5f9);
  filter: saturate(0.45);
  box-shadow: inset 0 0 0 1px rgba(100, 116, 139, 0.18);
}

.day-agenda-item.conducted span {
  color: #475569;
}

.day-agenda-item.conducted strong,
.day-agenda-item.conducted em {
  color: #64748b;
}

.calendar-detail-card,
.calendar-upcoming-card {
  padding: 18px;
}

.calendar-detail-card {
  display: grid;
  gap: 16px;
}

.calendar-detail-card h3,
.calendar-upcoming-card h3,
.calendar-week-summary h3 {
  margin: 0;
  color: var(--heading);
}

.close-side {
  width: 34px;
  height: 34px;
  color: #9aa8bb;
  background: #ffffff;
  border-color: transparent;
  box-shadow: none;
}

.close-side::before {
  content: "×";
  font-size: 22px;
  transform: none;
}

.calendar-detail-student {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
}

.avatar-ring {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: color-mix(in srgb, var(--avatar-color) 72%, #0f172a);
  background: color-mix(in srgb, var(--avatar-color) 13%, #ffffff);
  border: 1px solid color-mix(in srgb, var(--avatar-color) 24%, #dbe8ff);
  font-weight: 900;
}

.calendar-detail-topic,
.calendar-detail-notes {
  display: grid;
  gap: 6px;
}

.calendar-detail-topic span,
.calendar-detail-notes span {
  color: #62728a;
  font-size: 13px;
  font-weight: 800;
}

.calendar-detail-topic strong {
  color: var(--heading);
}

.calendar-detail-list {
  display: grid;
  gap: 12px;
  color: #52657f;
  font-size: 14px;
}

.calendar-detail-list span {
  overflow-wrap: anywhere;
}

.calendar-detail-list a {
  color: var(--blue);
  text-decoration: none;
}

.lesson-link-warning {
  color: #d97706;
  font-weight: 800;
}

.calendar-detail-notes p {
  margin: 0;
  color: #52657f;
  line-height: 1.5;
}

.selected-day-card {
  gap: 14px;
}

.selected-day-lessons {
  display: grid;
  gap: 10px;
}

.selected-day-lessons p {
  margin: 0;
  color: #62728a;
}

.selected-day-lesson {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid color-mix(in srgb, var(--event-color) 52%, #d8e4f5);
  border-radius: 8px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--event-color) 28%, #ffffff), color-mix(in srgb, var(--event-color) 7%, #ffffff));
  text-align: left;
  overflow: hidden;
  box-shadow: 0 12px 24px color-mix(in srgb, var(--event-color) 15%, transparent);
}

.selected-day-lesson strong,
.selected-day-lesson span {
  display: block;
}

.selected-day-lesson strong {
  color: var(--heading);
}

.selected-day-lesson span:not(.badge) {
  margin-top: 3px;
  color: #62728a;
  font-size: 12px;
}

.selected-day-lesson.conducted {
  border-color: #aeb9c8;
  background:
    repeating-linear-gradient(-45deg, rgba(100, 116, 139, 0.1) 0 8px, transparent 8px 16px),
    linear-gradient(135deg, color-mix(in srgb, var(--event-color) 6%, #e2e8f0), #f1f5f9);
  filter: saturate(0.45);
  box-shadow: inset 0 0 0 1px rgba(100, 116, 139, 0.18);
}

.selected-day-lesson.conducted strong,
.selected-day-lesson.conducted span:not(.badge) {
  color: #64748b;
}

.calendar-upcoming-list {
  display: grid;
  gap: 0;
  margin-top: 10px;
}

.calendar-upcoming-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  padding: 12px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  text-align: left;
}

.calendar-upcoming-item:last-child {
  border-bottom: 0;
}

.calendar-upcoming-item strong,
.calendar-upcoming-item b {
  color: var(--heading);
}

.calendar-upcoming-item span {
  display: block;
  margin-top: 3px;
  color: #62728a;
  font-size: 12px;
}

.calendar-upcoming-item.conducted {
  margin-inline: -8px;
  padding-inline: 8px;
  border-radius: 8px;
  background:
    repeating-linear-gradient(-45deg, rgba(100, 116, 139, 0.09) 0 8px, transparent 8px 16px),
    #f1f5f9;
  color: #64748b;
  filter: saturate(0.45);
}

.calendar-upcoming-item.conducted strong,
.calendar-upcoming-item.conducted b,
.calendar-upcoming-item.conducted span {
  color: #64748b;
}

.calendar-week-summary {
  min-height: 96px;
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  overflow: hidden;
  padding: 0 24px;
  background:
    radial-gradient(circle at 88% 62%, rgba(18, 103, 243, 0.08), transparent 22%),
    #ffffff;
}

.calendar-week-summary .mascot {
  transform: translateY(18px);
}

.calendar-week-summary p {
  margin: 6px 0 0;
  color: #62728a;
}

.summary-doodle {
  color: rgba(18, 103, 243, 0.26);
  font-size: 24px;
  font-weight: 900;
}

body[data-theme="dark"] .sidebar,
body[data-theme="dark"] .login-panel,
body[data-theme="dark"] .card,
body[data-theme="dark"] .metric,
body[data-theme="dark"] .lesson,
body[data-theme="dark"] .group-card,
body[data-theme="dark"] .assignment-student-card,
body[data-theme="dark"] .subpanel,
body[data-theme="dark"] .attachment-item,
body[data-theme="dark"] .calendar-board,
body[data-theme="dark"] .calendar-detail-card,
body[data-theme="dark"] .calendar-upcoming-card,
body[data-theme="dark"] .calendar-week-summary,
body[data-theme="dark"] .calendar-controlbar .icon-btn,
body[data-theme="dark"] .calendar-today,
body[data-theme="dark"] .calendar-filter-btn,
body[data-theme="dark"] .calendar-view-tabs,
body[data-theme="dark"] .calendar-filterbar,
body[data-theme="dark"] .calendar-filterbar .select,
body[data-theme="dark"] .calendar-filterbar .input,
body[data-theme="dark"] .input,
body[data-theme="dark"] .select,
body[data-theme="dark"] .textarea,
body[data-theme="dark"] .btn.secondary,
body[data-theme="dark"] .modal,
body[data-theme="dark"] .lesson-expanded {
  background-color: var(--surface);
  border-color: var(--line);
  color: var(--text);
}

body[data-theme="dark"] .calendar-page .calendar-grid {
  background: var(--line);
  border-color: var(--line);
}

body[data-theme="dark"] .calendar-page .calendar-day,
body[data-theme="dark"] .calendar-page .calendar-weekday,
body[data-theme="dark"] .week-column,
body[data-theme="dark"] .calendar-day-board,
body[data-theme="dark"] .selected-day-lesson,
body[data-theme="dark"] .day-agenda-item {
  background:
    linear-gradient(135deg, rgba(96, 165, 250, 0.055), rgba(18, 27, 45, 0.98)),
    var(--surface);
  border-color: var(--line);
}

body[data-theme="dark"] .calendar-page .calendar-event,
body[data-theme="dark"] .selected-day-lesson,
body[data-theme="dark"] .day-agenda-item {
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--event-color) 42%, #111827), color-mix(in srgb, var(--event-color) 16%, #172033));
  border-color: color-mix(in srgb, var(--event-color) 62%, var(--line));
  color: var(--text);
  box-shadow: 0 14px 28px color-mix(in srgb, var(--event-color) 20%, transparent);
}

body[data-theme="dark"] h1,
body[data-theme="dark"] h2,
body[data-theme="dark"] h3,
body[data-theme="dark"] .nav button,
body[data-theme="dark"] .calendar-detail-topic strong,
body[data-theme="dark"] .selected-day-lesson strong,
body[data-theme="dark"] .calendar-upcoming-item strong,
body[data-theme="dark"] .calendar-upcoming-item b {
  color: var(--heading);
}

body[data-theme="dark"] .hint,
body[data-theme="dark"] .muted,
body[data-theme="dark"] .calendar-detail-list,
body[data-theme="dark"] .calendar-detail-notes p,
body[data-theme="dark"] .calendar-upcoming-item span,
body[data-theme="dark"] .selected-day-lesson span:not(.badge),
body[data-theme="dark"] .day-agenda-item span:not(.badge) {
  color: var(--muted);
}

body[data-theme="dark"] .btn.primary,
body[data-theme="dark"] .calendar-view-tabs button.active,
body[data-theme="dark"] .calendar-filter-btn.active,
body[data-theme="dark"] .nav button.active,
body[data-theme="dark"] .nav button:hover {
  box-shadow: 0 14px 28px rgba(59, 130, 246, 0.2);
}

body[data-theme="pink"] .calendar-page .calendar-grid {
  background: #ffd8e9;
  border-color: #ffd8e9;
}

body[data-theme="pink"] .calendar-page .calendar-day,
body[data-theme="pink"] .calendar-page .calendar-weekday,
body[data-theme="pink"] .week-column,
body[data-theme="pink"] .calendar-day-board {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(255, 242, 248, 0.92)),
    var(--surface);
}

body[data-theme="pink"] .calendar-page .calendar-event,
body[data-theme="pink"] .selected-day-lesson,
body[data-theme="pink"] .day-agenda-item {
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--event-color) 34%, #ffffff), color-mix(in srgb, var(--event-color) 10%, #fff7fb));
  border-color: color-mix(in srgb, var(--event-color) 54%, #ffc2dd);
  box-shadow: 0 12px 24px color-mix(in srgb, var(--event-color) 15%, transparent);
}

body[data-theme="pink"] .calendar-week-summary {
  background:
    radial-gradient(circle at 88% 62%, rgba(236, 72, 153, 0.12), transparent 22%),
    #fff7fb;
}

body[data-theme="pink"] .theme-trigger {
  border-color: #ffc2dd;
  background:
    radial-gradient(circle at 12% 18%, rgba(236, 72, 153, 0.16), transparent 34%),
    linear-gradient(135deg, #ffffff, #fff0f7);
}

body[data-theme="pink"] .theme-menu {
  border-color: #ffd8e9;
}

@media (max-width: 1180px) {
  .calendar-page {
    grid-template-columns: 1fr;
  }

  .calendar-side-panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

@media (max-width: 820px) {
  .calendar-controlbar,
  .calendar-filterbar,
  .calendar-side-panel,
  .calendar-week-summary {
    grid-template-columns: 1fr;
  }

  .calendar-page .calendar-board {
    overflow-x: auto;
  }

  .calendar-page .calendar-grid {
    min-width: 760px;
  }

  .calendar-week-summary {
    padding: 18px;
  }

  .summary-doodle {
    display: none;
  }
}

@media (max-width: 820px) {
  html,
  body {
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
  }

  body {
    font-size: 14px;
  }

  .app-shell,
  .app-shell.sidebar-collapsed {
    width: 100%;
    min-width: 0;
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
    padding: 64px 10px 10px;
  }

  .sidebar,
  .sidebar-collapsed .sidebar {
    position: fixed;
    z-index: 60;
    top: 10px;
    left: 10px;
    bottom: 10px;
    width: min(316px, calc(100vw - 20px));
    height: auto;
    min-width: 0;
    padding: 12px;
    align-items: stretch;
    overflow-y: auto;
    transform: translateX(calc(-100% - 24px));
    transition: transform 180ms ease, box-shadow 180ms ease;
  }

  .mobile-sidebar-open .sidebar,
  .mobile-sidebar-open.sidebar-collapsed .sidebar {
    transform: translateX(0);
    box-shadow: 0 24px 70px rgba(15, 23, 42, 0.26);
  }

  .mobile-menu-button {
    position: fixed;
    z-index: 50;
    left: 14px;
    top: 12px;
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    gap: 4px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 14px 34px rgba(16, 24, 40, 0.14);
  }

  .mobile-menu-button span {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: var(--heading);
  }

  .mobile-sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 55;
    display: none;
    background: rgba(15, 23, 42, 0.34);
    backdrop-filter: blur(3px);
  }

  .mobile-sidebar-open .mobile-sidebar-backdrop {
    display: block;
  }

  .sidebar-toggle {
    display: none;
  }

  .brand {
    padding-bottom: 10px;
    margin-bottom: 10px;
  }

  .sidebar-collapsed .brand > div,
  .sidebar-collapsed .sidebar-account > div:not(.account-avatar),
  .sidebar-collapsed .nav-label,
  .sidebar-collapsed .theme-switcher,
  .sidebar-collapsed .sidebar-logout,
  .sidebar-collapsed .nav-badge {
    display: initial;
  }

  .sidebar-collapsed .brand,
  .sidebar-collapsed .nav button {
    justify-content: flex-start;
  }

  .brand h1 {
    font-size: 18px;
  }

  .sidebar-account {
    margin-bottom: 10px;
  }

  .theme-switcher {
    margin-bottom: 10px;
  }

  .theme-menu {
    position: static;
    margin-top: 8px;
  }

  .nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .nav button {
    min-width: 0;
    min-height: 48px;
    padding: 8px;
    font-size: 14px;
  }

  .nav-icon {
    width: 28px;
    height: 28px;
  }

  .sidebar-logout {
    margin-top: 10px;
  }

  .main,
  .content,
  .dashboard-home,
  .calendar-page,
  .card,
  .modal,
  .lesson-expanded {
    min-width: 0;
    max-width: 100%;
  }

  .content {
    padding: 0;
  }

  .toolbar,
  .row,
  .row.wrap {
    min-width: 0;
    gap: 10px;
  }

  .toolbar {
    align-items: stretch;
  }

  .assignments-toolbar {
    justify-content: center;
    min-height: 0;
  }

  .assignments-toolbar > .btn {
    position: static;
    transform: none;
  }

  .toolbar > .btn,
  .toolbar .row,
  .hero-actions .btn,
  .hero-actions .btn.secondary {
    width: 100%;
  }

  .grid,
  .grid.cols-1,
  .grid.cols-2,
  .grid.cols-3,
  .dashboard-info-grid,
  .dashboard-home .dashboard-metrics,
  .form-grid,
  .lesson-expanded-grid,
  .profile-avatar-panel {
    grid-template-columns: minmax(0, 1fr);
  }

  .dashboard-home .dashboard-hero {
    min-height: 0;
    padding: 20px;
  }

  .dashboard-home .hero-copy h2,
  .hero-copy h2 {
    font-size: 28px;
  }

  .dashboard-home .hero-copy p,
  .hero-copy p {
    font-size: 15px;
  }

  .hero-visual,
  .formula-cloud,
  .dashboard-home .hero-visual {
    display: none;
  }

  .dashboard-home .metric {
    min-height: 118px;
    padding: 20px;
  }

  .dashboard-home .metric strong {
    font-size: 38px;
  }

  .dashboard-info-card {
    min-height: 0;
    padding: 18px;
  }

  .student-title,
  .student-title.compact-row {
    min-width: 0;
  }

  .student-work-stats {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .subpanel .row,
  .lesson .row,
  .assignment-student-card .row {
    align-items: flex-start;
  }

  .calendar-page {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .calendar-page-head {
    align-items: stretch;
  }

  .calendar-page-title h2 {
    font-size: 30px;
  }

  .calendar-controlbar {
    grid-template-columns: auto auto minmax(0, 1fr);
    gap: 8px;
  }

  .calendar-controlbar .calendar-view-tabs,
  .calendar-controlbar .calendar-filter-btn {
    grid-column: 1 / -1;
  }

  .calendar-view-tabs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .calendar-filterbar,
  .student-calendar-filters {
    grid-template-columns: minmax(0, 1fr);
  }

  .calendar-search {
    min-width: 0;
  }

  .calendar-page .calendar-board {
    width: 100%;
    overflow-x: hidden;
  }

  .calendar-page .calendar-grid {
    width: 100%;
    min-width: 0;
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

  .calendar-page .calendar-weekday {
    min-height: 32px;
    padding: 8px 2px;
    font-size: 11px;
  }

  .calendar-page .calendar-day {
    min-width: 0;
    min-height: 92px;
    padding: 7px 4px;
    gap: 5px;
  }

  .calendar-day-number {
    width: 24px;
    height: 24px;
    font-size: 12px;
  }

  .calendar-page .calendar-events {
    gap: 4px;
  }

  .calendar-page .calendar-event {
    min-width: 0;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-areas:
      "time"
      "title"
      "mark";
    gap: 1px;
    padding: 6px 5px;
  }

  .calendar-page .calendar-event-dot {
    display: none;
  }

  .calendar-page .calendar-event-time {
    font-size: 10px;
  }

  .calendar-page .calendar-event-title {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 11px;
  }

  .conducted-mark {
    max-width: 100%;
    font-size: 8px;
  }

  .calendar-side-panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .calendar-week-board,
  .calendar-day-board {
    min-height: 0;
  }

  .calendar-week-board {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .week-column {
    min-width: 0;
    border-right: 0;
    border-bottom: 1px solid #dfe8f6;
  }

  .day-agenda-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .selected-day-lesson,
  .calendar-upcoming-item {
    grid-template-columns: minmax(0, 1fr);
  }

  .calendar-week-summary {
    min-height: 0;
    padding: 18px;
  }

  .calendar-week-summary .mascot {
    display: none;
  }

  .modal-backdrop,
  .preview-backdrop,
  .lesson-backdrop {
    padding: 10px;
  }

  .modal {
    width: 100%;
    max-height: calc(100vh - 20px);
    overflow: auto;
    padding: 18px;
  }

  .preview-topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .annotation-toolbar {
    width: 100%;
    margin-left: 0;
  }

  .annotation-pen-menu {
    left: 0;
    width: min(238px, calc(100vw - 42px));
  }
}

@media (max-width: 520px) {
  .app-shell {
    padding: 8px;
  }

  .card,
  .dashboard-info-card,
  .calendar-detail-card,
  .calendar-upcoming-card {
    padding: 14px;
  }

  .nav {
    grid-template-columns: minmax(0, 1fr);
  }

  .nav button {
    justify-content: flex-start;
  }

  .calendar-controlbar {
    grid-template-columns: auto auto minmax(0, 1fr);
  }

  .calendar-today {
    padding-inline: 10px;
  }

  .calendar-month-label strong {
    font-size: 17px;
  }

  .calendar-page .calendar-day {
    min-height: 78px;
    padding: 5px 3px;
  }

  .calendar-page .calendar-weekday {
    font-size: 10px;
  }

  .calendar-page .calendar-event {
    padding: 5px 4px;
    grid-template-columns: 7px minmax(0, 1fr);
    grid-template-areas:
      "dot time";
    align-items: center;
    min-height: 24px;
  }

  .calendar-page .calendar-event-dot {
    display: block;
    width: 6px;
    height: 6px;
    box-shadow: none;
  }

  .calendar-page .calendar-event-time {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 9px;
  }

  .calendar-page .calendar-event-title {
    display: none;
  }

  .calendar-page .calendar-event .conducted-mark {
    display: none;
  }

  .profile-avatar-panel {
    justify-items: center;
    text-align: center;
  }

  .btn,
  .btn.secondary {
    width: 100%;
    justify-content: center;
  }
}

/* Absolute final dark contrast overrides. */
body[data-theme="dark"] {
  --bg: #070b14;
  --surface: #111827;
  --surface-soft: #182235;
  --text: #e7edf8;
  --heading: #ffffff;
  --muted: #c0cadb;
  --line: #334155;
  --blue: #60a5fa;
  --blue-strong: #bfdbfe;
  color: var(--text);
  background: #070b14;
}

body[data-theme="dark"] .sidebar,
body[data-theme="dark"] .card,
body[data-theme="dark"] .modal,
body[data-theme="dark"] .lesson-expanded,
body[data-theme="dark"] .calendar-board,
body[data-theme="dark"] .calendar-detail-card,
body[data-theme="dark"] .calendar-upcoming-card,
body[data-theme="dark"] .calendar-week-summary,
body[data-theme="dark"] .calendar-filterbar,
body[data-theme="dark"] .calendar-view-tabs,
body[data-theme="dark"] .calendar-today,
body[data-theme="dark"] .calendar-filter-btn,
body[data-theme="dark"] .sidebar-account,
body[data-theme="dark"] .theme-trigger,
body[data-theme="dark"] .theme-menu,
body[data-theme="dark"] .subpanel,
body[data-theme="dark"] .teacher-comment,
body[data-theme="dark"] .score-summary {
  color: var(--text);
  background-color: var(--surface);
  border-color: var(--line);
}

body[data-theme="dark"] h1,
body[data-theme="dark"] h2,
body[data-theme="dark"] h3,
body[data-theme="dark"] h4,
body[data-theme="dark"] strong,
body[data-theme="dark"] b,
body[data-theme="dark"] label,
body[data-theme="dark"] .nav button,
body[data-theme="dark"] .card h3,
body[data-theme="dark"] .metric strong,
body[data-theme="dark"] .calendar-month-label strong,
body[data-theme="dark"] .calendar-page-title h2,
body[data-theme="dark"] .calendar-detail-topic strong,
body[data-theme="dark"] .sidebar-account strong,
body[data-theme="dark"] .theme-title strong {
  color: var(--heading);
}

body[data-theme="dark"] p,
body[data-theme="dark"] .hint,
body[data-theme="dark"] .muted,
body[data-theme="dark"] .metric .muted,
body[data-theme="dark"] .hero-copy p,
body[data-theme="dark"] .calendar-detail-list,
body[data-theme="dark"] .calendar-detail-topic span,
body[data-theme="dark"] .calendar-detail-notes span,
body[data-theme="dark"] .calendar-detail-notes p,
body[data-theme="dark"] .calendar-upcoming-item span,
body[data-theme="dark"] .selected-day-lesson span:not(.badge),
body[data-theme="dark"] .day-agenda-item span:not(.badge),
body[data-theme="dark"] .calendar-page .calendar-weekday,
body[data-theme="dark"] .theme-title small {
  color: var(--muted);
}

body[data-theme="dark"] .input,
body[data-theme="dark"] .select,
body[data-theme="dark"] .textarea {
  color: #f8fafc;
  background: #0f172a;
  border-color: #475569;
}

body[data-theme="dark"] .nav button.active,
body[data-theme="dark"] .nav button:hover,
body[data-theme="dark"] .calendar-view-tabs button.active,
body[data-theme="dark"] .calendar-filter-btn.active {
  color: #ffffff;
  background: #1d4ed8;
}

body[data-theme="dark"] .nav-icon {
  color: #bfdbfe;
  background: #172c4d;
  border-color: #2f4d76;
}

body[data-theme="dark"] .nav button.active .nav-icon,
body[data-theme="dark"] .nav button:hover .nav-icon {
  color: #0f172a;
  background: #bfdbfe;
  border-color: #bfdbfe;
}

body[data-theme="dark"] .calendar-page .calendar-grid {
  background: #334155;
  border-color: #334155;
}

body[data-theme="dark"] .calendar-page .calendar-day,
body[data-theme="dark"] .calendar-page .calendar-weekday,
body[data-theme="dark"] .week-column,
body[data-theme="dark"] .calendar-day-board {
  color: var(--text);
  background: #111827;
  border-color: #334155;
}

body[data-theme="dark"] .calendar-day-number,
body[data-theme="dark"] .week-column-head strong {
  color: #ffffff;
  background: #1e3a5f;
}

body[data-theme="dark"] .calendar-page .calendar-event,
body[data-theme="dark"] .selected-day-lesson,
body[data-theme="dark"] .day-agenda-item {
  color: #f8fafc;
  background: linear-gradient(135deg, color-mix(in srgb, var(--event-color) 56%, #0f172a), color-mix(in srgb, var(--event-color) 24%, #111827));
  border-color: color-mix(in srgb, var(--event-color) 74%, #64748b);
}

body[data-theme="dark"] .calendar-page .calendar-event-title,
body[data-theme="dark"] .calendar-page .calendar-event-time,
body[data-theme="dark"] .day-agenda-item span,
body[data-theme="dark"] .selected-day-lesson strong {
  color: #ffffff;
}

body[data-theme="dark"] .mobile-menu-button {
  background: #111827;
  border-color: #475569;
}

body[data-theme="dark"] .mobile-menu-button span {
  background: #ffffff;
}