:root {
  --heritage-steel-800: #35495a;
  --heritage-steel-700: #4a6b7d;
  --heritage-steel-600: #5f849b;
  --heritage-steel-500: #7a9db3;
  --heritage-steel-400: #9cbccf;
  --heritage-steel-200: #d3e2ea;
  --heritage-amber-600: #e09a3e;
  --heritage-amber-500: #f2b263;
  --heritage-amber-300: #f8d49c;
  --heritage-amber-200: #fbe5c2;
  --heritage-aqua-400: #5fc3e4;
  --heritage-ink-900: #1a2e3b;
  --heritage-ink-700: #3d5263;
  --heritage-ink-500: #6b8090;
  --heritage-ink-300: #8fa3b1;
  --heritage-mist: #f5f7f9;
  --heritage-paper: #faf6ee;
  --heritage-harbor: #f0f4f7;

  --cis-canvas: var(--heritage-mist);
  --cis-blooms:
    radial-gradient(48rem 32rem at 4% -8%, rgba(122, 157, 179, 0.32), transparent 60%),
    radial-gradient(40rem 28rem at 100% 2%, rgba(211, 226, 234, 0.7), transparent 55%),
    radial-gradient(40rem 30rem at 50% 115%, rgba(242, 178, 99, 0.16), transparent 60%);
  --cis-bar-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.7));
  --cis-bar-fg: var(--heritage-ink-900);
  --cis-bar-muted: var(--heritage-ink-500);
  --cis-bar-border: rgba(95, 132, 155, 0.18);
  --cis-bar-ghost: rgba(255, 255, 255, 0.6);
  --cis-logo-1: var(--heritage-steel-600);
  --cis-logo-2: var(--heritage-ink-500);
  --cis-primary: var(--heritage-steel-600);
  --cis-primary-deep: var(--heritage-steel-700);
  --cis-primary-soft: rgba(95, 132, 155, 0.13);
  --cis-action-grad: linear-gradient(180deg, var(--heritage-amber-300), var(--heritage-amber-500));
  --cis-action-fg: #5c3d0e;
  --cis-action-bd: var(--heritage-amber-600);
  --cis-action-glow: rgba(242, 178, 99, 0.38);
  --cis-card-bg: linear-gradient(150deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.62) 100%);
  --cis-card-solid: rgba(255, 255, 255, 0.9);
  --cis-card-bd: rgba(255, 255, 255, 0.95);
  --cis-card-inset: inset 0 1px 0 #fff;
  --cis-ink: var(--heritage-ink-900);
  --cis-ink-soft: var(--heritage-ink-500);
  --cis-ink-mute: var(--heritage-ink-300);
  --cis-spot: var(--heritage-amber-600);
  --cis-banner: linear-gradient(135deg, var(--heritage-steel-700) 0%, var(--heritage-steel-600) 55%, var(--heritage-steel-500) 100%);
  --cis-field-bg: rgba(26, 46, 59, 0.05);
  --cis-field-bd: rgba(26, 46, 59, 0.1);
  --cis-divider: rgba(26, 46, 59, 0.08);
  --cis-sidebar: rgba(245, 247, 249, 0.78);
  --cis-workspace: #e9eef1;
  --cis-toolbar: rgba(255, 255, 255, 0.86);
  --cis-hover: rgba(255, 255, 255, 0.66);
  --cis-overlay: rgba(25, 37, 45, 0.35);
  --cis-paper: #fff;
  --cis-paper-ink: #1a2e3b;
  --cis-board-grid: #edf0ed;

  --ink-950: var(--cis-ink);
  --ink-850: var(--cis-ink);
  --ink-700: var(--cis-ink-soft);
  --ink-550: var(--cis-ink-soft);
  --ink-400: var(--cis-ink-mute);
  --line: var(--cis-divider);
  --line-strong: var(--cis-field-bd);
  --page: var(--cis-canvas);
  --canvas: var(--cis-card-solid);
  --panel: var(--cis-field-bg);
  --white: var(--cis-card-solid);
  --steel-800: var(--cis-primary-deep);
  --steel-700: var(--cis-primary-deep);
  --steel-600: var(--cis-primary);
  --steel-200: var(--heritage-steel-200);
  --steel-100: var(--cis-primary-soft);
  --amber-700: #bd7422;
  --amber-600: var(--heritage-amber-600);
  --amber-500: var(--heritage-amber-500);
  --amber-100: rgba(242, 178, 99, 0.18);
  --green-700: #2e7861;
  --green-100: #e8f3ee;
  --red-600: #b95852;
  --red-100: #f8eae8;
  --purple-600: #766c9b;
  --purple-100: #f0edf7;
  --shadow-sm: 0 1px 2px rgba(26, 46, 59, 0.05);
  --shadow-md: 0 12px 34px rgba(26, 46, 59, 0.09);
  --shadow-lg: 0 24px 70px rgba(26, 46, 59, 0.16);
  --ease: 190ms cubic-bezier(0.2, 0.8, 0.2, 1);
  --sans: "Noto Sans TC", "PingFang TC", sans-serif;
  --display: "Baloo 2", "Huninn", "Noto Sans TC", sans-serif;
  --tc: "Huninn", "Noto Sans TC", sans-serif;
  --hand: "LXGW WenKai TC", serif;
  --mono: "IBM Plex Mono", monospace;
  color-scheme: light;
}

[data-cis="steel"] {
  --cis-action-grad: linear-gradient(180deg, var(--heritage-steel-500), var(--heritage-steel-700));
  --cis-action-fg: #fff;
  --cis-action-bd: var(--heritage-steel-700);
  --cis-action-glow: rgba(95, 132, 155, 0.4);
  --cis-spot: var(--heritage-steel-600);
}

[data-cis="sunny"] {
  --cis-canvas: var(--heritage-paper);
  --cis-blooms:
    radial-gradient(46rem 30rem at 6% -8%, rgba(242, 178, 99, 0.24), transparent 60%),
    radial-gradient(40rem 28rem at 102% 2%, rgba(122, 157, 179, 0.28), transparent 55%),
    radial-gradient(36rem 28rem at 50% 115%, rgba(95, 195, 228, 0.16), transparent 60%);
  --cis-bar-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 253, 247, 0.7));
  --cis-bar-fg: #33414d;
  --cis-bar-muted: #75808a;
  --cis-bar-border: rgba(224, 154, 62, 0.22);
  --cis-logo-2: var(--heritage-amber-600);
  --cis-ink: #33414d;
  --cis-ink-soft: #75808a;
  --cis-banner: linear-gradient(135deg, var(--heritage-steel-600) 0%, var(--heritage-steel-500) 60%, var(--heritage-amber-500) 130%);
  --cis-sidebar: rgba(250, 246, 238, 0.82);
  --cis-workspace: #f1ece2;
}

[data-cis="ink"] {
  --cis-canvas: var(--heritage-harbor);
  --cis-blooms:
    radial-gradient(44rem 28rem at 0% -8%, rgba(122, 157, 179, 0.3), transparent 60%),
    radial-gradient(36rem 26rem at 105% 110%, rgba(95, 195, 228, 0.16), transparent 60%);
  --cis-bar-bg: linear-gradient(180deg, rgba(30, 46, 60, 0.95), rgba(18, 30, 42, 0.9));
  --cis-bar-fg: #e6eef5;
  --cis-bar-muted: #b9c9d8;
  --cis-bar-border: rgba(255, 255, 255, 0.12);
  --cis-bar-ghost: rgba(255, 255, 255, 0.1);
  --cis-logo-1: #8fb8d0;
  --cis-logo-2: #b9c9d8;
  --cis-action-grad: linear-gradient(180deg, var(--heritage-steel-600), var(--heritage-steel-800));
  --cis-action-fg: #fff;
  --cis-action-bd: var(--heritage-steel-800);
  --cis-action-glow: rgba(53, 73, 90, 0.4);
  --cis-spot: var(--heritage-steel-700);
  --cis-banner: linear-gradient(150deg, #24384a 0%, var(--heritage-ink-900) 100%);
}

[data-theme="dark"] {
  --cis-canvas: #101820;
  --cis-blooms:
    radial-gradient(46rem 30rem at 4% -8%, rgba(95, 132, 155, 0.18), transparent 60%),
    radial-gradient(40rem 30rem at 100% 110%, rgba(242, 178, 99, 0.08), transparent 60%);
  --cis-bar-bg: linear-gradient(180deg, rgba(20, 30, 42, 0.94), rgba(13, 21, 30, 0.88));
  --cis-bar-fg: #dce6ed;
  --cis-bar-muted: #93adc0;
  --cis-bar-border: rgba(95, 132, 155, 0.22);
  --cis-bar-ghost: rgba(255, 255, 255, 0.08);
  --cis-logo-1: #8fb8d0;
  --cis-logo-2: #93adc0;
  --cis-primary: #6e9ab5;
  --cis-primary-deep: #8fb8d0;
  --cis-primary-soft: rgba(110, 154, 181, 0.16);
  --cis-action-grad: linear-gradient(180deg, var(--heritage-amber-500), var(--heritage-amber-600));
  --cis-action-fg: #2e2005;
  --cis-action-bd: #b97c28;
  --cis-action-glow: rgba(242, 178, 99, 0.22);
  --cis-card-bg: linear-gradient(150deg, rgba(28, 40, 56, 0.92) 0%, rgba(20, 30, 44, 0.78) 100%);
  --cis-card-solid: rgba(24, 35, 48, 0.94);
  --cis-card-bd: rgba(95, 132, 155, 0.22);
  --cis-card-inset: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  --cis-ink: #dce6ed;
  --cis-ink-soft: #93adc0;
  --cis-ink-mute: #6e8a9e;
  --cis-spot: var(--heritage-amber-500);
  --cis-banner: linear-gradient(150deg, #1e3242 0%, #121e2a 100%);
  --cis-field-bg: rgba(220, 230, 237, 0.06);
  --cis-field-bd: rgba(220, 230, 237, 0.12);
  --cis-divider: rgba(220, 230, 237, 0.1);
  --cis-sidebar: rgba(15, 24, 33, 0.82);
  --cis-workspace: #0d151e;
  --cis-toolbar: rgba(20, 30, 42, 0.92);
  --cis-hover: rgba(255, 255, 255, 0.06);
  --cis-overlay: rgba(3, 8, 14, 0.68);
  --cis-paper: #182431;
  --cis-paper-ink: #dce6ed;
  --green-700: #65b99c;
  --green-100: rgba(46, 120, 97, 0.18);
  --red-600: #df8882;
  --red-100: rgba(185, 88, 82, 0.18);
  --purple-600: #aca1d2;
  --purple-100: rgba(118, 108, 155, 0.2);
  --shadow-sm: 0 1px 2px rgba(5, 10, 16, 0.28);
  --shadow-md: 0 12px 34px rgba(5, 10, 16, 0.42);
  --shadow-lg: 0 24px 70px rgba(5, 10, 16, 0.62);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-width: 320px;
  height: 100%;
  margin: 0;
  color: var(--ink-950);
  background-color: var(--page);
  background-image: var(--cis-blooms);
  background-attachment: fixed;
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

body {
  overflow: hidden;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

[hidden] {
  display: none !important;
}

svg.lucide {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  stroke-width: 1.8;
}

.boot-screen {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 13px;
  color: var(--ink-700);
  background:
    radial-gradient(circle at 47% 44%, rgba(220, 232, 237, 0.8), transparent 26%),
    var(--page);
}

.boot-screen > div:last-child {
  display: grid;
  gap: 2px;
}

.boot-screen strong {
  color: var(--ink-950);
  font-size: 14px;
}

.boot-screen span {
  color: var(--ink-550);
  font-size: 11px;
}

.boot-mark {
  display: grid;
  place-items: center;
  color: white;
  background: var(--steel-700);
  font-family: var(--mono);
  font-weight: 500;
}

.boot-mark {
  width: 36px;
  height: 36px;
  border-radius: 11px;
  box-shadow: var(--shadow-md);
}

.app {
  width: 100vw;
  height: 100vh;
  display: grid;
  grid-template-rows: 58px minmax(0, 1fr);
}

.topbar {
  position: relative;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 18px;
  background: rgba(251, 251, 249, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.topbar-left,
.topbar-actions,
.brand,
.breadcrumbs,
.save-state,
.user-chip {
  display: flex;
  align-items: center;
}

.topbar-left {
  min-width: 0;
  gap: 15px;
}

.brand {
  flex: 0 0 auto;
  gap: 9px;
}

.brand-bot {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  object-fit: contain;
}

.brand-copy {
  display: grid;
  line-height: 1.1;
}

.brand-copy strong {
  font-size: 12px;
  letter-spacing: 0.01em;
}

.brand-wordmark {
  display: flex;
  align-items: baseline;
  font-family: var(--display);
  font-weight: 800;
  line-height: 1;
}

.wordmark-main {
  color: var(--cis-logo-1);
  font-size: 15px;
}

.wordmark-domain {
  color: var(--cis-logo-2);
  font-size: 9px;
  letter-spacing: 0.06em;
}

.product-name {
  margin-left: 7px;
  padding-left: 7px;
  color: var(--cis-bar-fg);
  border-left: 1px solid var(--cis-bar-border);
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
}

.brand-copy small {
  margin-top: 3px;
  color: var(--ink-550);
  font-size: 8px;
  letter-spacing: 0.08em;
}

.topbar-divider {
  width: 1px;
  height: 22px;
  background: var(--line-strong);
}

.breadcrumbs {
  min-width: 0;
  gap: 7px;
  color: var(--ink-550);
  font-size: 10px;
  white-space: nowrap;
}

.breadcrumbs strong {
  max-width: 280px;
  overflow: hidden;
  color: var(--ink-850);
  font-weight: 600;
  text-overflow: ellipsis;
}

.breadcrumbs svg {
  width: 12px;
  height: 12px;
}

.topbar-actions {
  flex: 0 0 auto;
  gap: 7px;
}

.icon-button {
  position: relative;
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  color: var(--ink-550);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 9px;
  transition:
    color var(--ease),
    background var(--ease),
    border var(--ease),
    transform var(--ease);
}

.icon-button:hover {
  color: var(--ink-950);
  background: var(--white);
  border-color: var(--line);
}

.icon-button:active {
  transform: translateY(1px);
}

.icon-button.active {
  color: var(--steel-700);
  background: var(--steel-100);
  border-color: var(--steel-200);
}

[data-tooltip]::after {
  position: absolute;
  top: calc(100% + 7px);
  left: 50%;
  z-index: 300;
  padding: 5px 7px;
  color: #fff;
  background: var(--ink-950);
  border-radius: 6px;
  content: attr(data-tooltip);
  font-size: 8px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -3px);
  transition: opacity var(--ease), transform var(--ease);
  white-space: nowrap;
}

[data-tooltip]:hover::after,
[data-tooltip]:focus-visible::after {
  opacity: 1;
  transform: translate(-50%, 0);
}

.notification-badge {
  position: absolute;
  top: -3px;
  right: -3px;
  min-width: 16px;
  height: 16px;
  display: grid;
  place-items: center;
  padding: 0 4px;
  color: #fff;
  background: var(--amber-600);
  border: 2px solid var(--canvas);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 7px;
  box-shadow: 0 3px 9px rgba(217, 148, 54, 0.25);
}

.save-state {
  gap: 6px;
  margin-right: 4px;
  color: var(--ink-550);
  font-size: 9px;
}

.status-dot {
  width: 6px;
  height: 6px;
  background: var(--green-700);
  border-radius: 50%;
}

.save-state.saving .status-dot {
  background: var(--amber-500);
  animation: pulse 1.2s infinite;
}

.save-state.error {
  color: var(--red-600);
}

.save-state.error .status-dot {
  background: var(--red-600);
}

@keyframes pulse {
  50% {
    opacity: 0.35;
  }
}

.user-chip {
  gap: 7px;
  height: 34px;
  margin-left: 3px;
  padding: 0 9px 0 5px;
  color: var(--ink-700);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 9px;
}

.user-chip:hover {
  background: var(--white);
  border-color: var(--line);
}

.avatar {
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  color: var(--steel-800);
  background: var(--steel-100);
  border: 1px solid var(--steel-200);
  border-radius: 8px;
  font-size: 9px;
  font-weight: 700;
}

.view-root {
  min-width: 0;
  min-height: 0;
  overflow: auto;
}

.dashboard-layout {
  min-height: 100%;
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
}

.side-nav {
  position: sticky;
  top: 0;
  height: calc(100vh - 58px);
  display: flex;
  flex-direction: column;
  padding: 20px 13px 14px;
  background: #f1f3f0;
  border-right: 1px solid var(--line);
}

.nav-section-label,
.eyebrow {
  color: var(--ink-400);
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.nav-section-label {
  padding: 0 9px 8px;
}

.side-nav button {
  width: 100%;
  height: 38px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 10px;
  color: var(--ink-550);
  background: transparent;
  border: 0;
  border-radius: 9px;
  font-size: 10px;
  text-align: left;
}

.side-nav button:hover {
  color: var(--ink-850);
  background: rgba(255, 255, 255, 0.65);
}

.side-nav button.active {
  color: var(--steel-800);
  background: var(--white);
  box-shadow: var(--shadow-sm), inset 3px 0 0 var(--steel-600);
}

.side-nav button svg {
  width: 16px;
  height: 16px;
}

.side-nav-footer {
  margin-top: auto;
  padding: 12px 9px 4px;
  color: var(--ink-400);
  font-size: 8px;
  line-height: 1.6;
}

.content-wrap {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 34px 38px 60px;
}

.page-heading,
.section-heading,
.card-row,
.filter-bar,
.form-row,
.modal-header,
.modal-footer,
.course-hero,
.workspace-toolbar,
.workspace-mode-tabs,
.tutor-composer,
.question-meta,
.result-summary {
  display: flex;
  align-items: center;
}

.page-heading {
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.page-heading h1,
.modal-header h2 {
  margin: 5px 0 0;
  color: var(--ink-950);
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-heading p {
  max-width: 620px;
  margin: 8px 0 0;
  color: var(--ink-550);
  font-size: 11px;
  line-height: 1.7;
}

.button-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.button {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 13px;
  border: 1px solid transparent;
  border-radius: 9px;
  font-size: 10px;
  font-weight: 600;
  transition:
    transform var(--ease),
    background var(--ease),
    border var(--ease),
    color var(--ease);
}

.button:hover {
  transform: translateY(-1px);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
  transform: none;
}

.button-primary {
  color: #fff;
  background: var(--steel-700);
  border-color: var(--steel-700);
  box-shadow: 0 7px 18px rgba(73, 109, 128, 0.16);
}

.button-primary:hover {
  background: var(--steel-800);
}

.button-secondary {
  color: var(--ink-700);
  background: var(--white);
  border-color: var(--line-strong);
}

.button-secondary:hover {
  color: var(--ink-950);
  border-color: var(--ink-400);
}

.button-quiet {
  color: var(--ink-550);
  background: transparent;
}

.button-danger {
  color: var(--red-600);
  background: var(--red-100);
  border-color: rgba(185, 88, 82, 0.16);
}

.button svg {
  width: 15px;
  height: 15px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 30px;
}

.metric-card,
.panel-card,
.list-card,
.activity-card,
.question-card,
.paper-card {
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.metric-card {
  min-height: 105px;
  padding: 17px;
  border-radius: 13px;
}

.metric-icon {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  margin-bottom: 12px;
  color: var(--steel-700);
  background: var(--steel-100);
  border-radius: 9px;
}

.metric-icon.amber {
  color: var(--amber-700);
  background: var(--amber-100);
}

.metric-icon.green {
  color: var(--green-700);
  background: var(--green-100);
}

.metric-icon.purple {
  color: var(--purple-600);
  background: var(--purple-100);
}

.metric-icon svg {
  width: 15px;
  height: 15px;
}

.metric-card strong {
  display: block;
  font-family: var(--mono);
  font-size: 21px;
  font-weight: 500;
}

.metric-card span {
  display: block;
  margin-top: 3px;
  color: var(--ink-550);
  font-size: 9px;
}

.section-heading {
  justify-content: space-between;
  gap: 20px;
  margin: 26px 0 12px;
}

.section-heading h2 {
  margin: 0;
  font-size: 13px;
}

.section-heading p {
  margin: 4px 0 0;
  color: var(--ink-550);
  font-size: 9px;
}

.filter-bar {
  gap: 9px;
  margin-bottom: 14px;
}

.search-field {
  position: relative;
  min-width: 240px;
  flex: 1;
}

.search-field svg {
  position: absolute;
  top: 50%;
  left: 11px;
  width: 14px;
  height: 14px;
  color: var(--ink-400);
  transform: translateY(-50%);
}

.field,
.search-field input,
.select {
  width: 100%;
  min-height: 38px;
  padding: 8px 11px;
  color: var(--ink-850);
  background: var(--white);
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  outline: none;
  font-size: 10px;
  transition: border var(--ease), box-shadow var(--ease);
}

.search-field input {
  padding-left: 34px;
}

.field:focus,
.search-field input:focus,
.select:focus {
  border-color: var(--steel-600);
  box-shadow: 0 0 0 3px rgba(95, 132, 155, 0.1);
}

textarea.field {
  min-height: 90px;
  resize: vertical;
}

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

.question-card,
.paper-card,
.activity-card {
  position: relative;
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: 16px;
  border-radius: 13px;
  transition: transform var(--ease), box-shadow var(--ease), border var(--ease);
}

.question-card:hover,
.paper-card:hover,
.activity-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-kicker,
.status-pill,
.tag {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  border-radius: 999px;
  font-size: 8px;
}

.card-kicker {
  gap: 5px;
  color: var(--steel-700);
  font-family: var(--mono);
  letter-spacing: 0.06em;
}

.question-card h3,
.paper-card h3,
.activity-card h3 {
  margin: 10px 0 6px;
  font-size: 12px;
  line-height: 1.45;
}

.card-description {
  display: -webkit-box;
  min-height: 32px;
  margin: 0;
  overflow: hidden;
  color: var(--ink-550);
  font-size: 9px;
  line-height: 1.65;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.tag {
  padding: 3px 7px;
  color: var(--ink-550);
  background: var(--panel);
  border: 1px solid var(--line);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: auto;
  padding-top: 15px;
  color: var(--ink-400);
  font-size: 8px;
}

.card-actions {
  display: flex;
  gap: 4px;
}

.card-actions .icon-button {
  width: 28px;
  height: 28px;
}

.status-pill {
  gap: 5px;
  padding: 4px 8px;
  font-weight: 600;
}

.status-pill::before {
  width: 5px;
  height: 5px;
  background: currentColor;
  border-radius: 50%;
  content: "";
}

.status-draft {
  color: var(--ink-550);
  background: var(--panel);
}

.status-scheduled {
  color: var(--purple-600);
  background: var(--purple-100);
}

.status-open,
.status-submitted {
  color: var(--green-700);
  background: var(--green-100);
}

.status-closed,
.status-archived {
  color: var(--red-600);
  background: var(--red-100);
}

.empty-state {
  min-height: 300px;
  display: grid;
  place-items: center;
  align-content: center;
  padding: 40px;
  color: var(--ink-550);
  background: rgba(255, 255, 255, 0.45);
  border: 1px dashed var(--line-strong);
  border-radius: 15px;
  text-align: center;
}

.empty-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: var(--steel-600);
  background: var(--steel-100);
  border-radius: 13px;
}

.empty-state h3 {
  margin: 14px 0 5px;
  color: var(--ink-850);
  font-size: 12px;
}

.empty-state p {
  max-width: 420px;
  margin: 0;
  font-size: 9px;
  line-height: 1.7;
}

.course-hero {
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 22px;
  padding: 22px 24px;
  color: #eef3f5;
  background:
    linear-gradient(120deg, rgba(73, 109, 128, 0.98), rgba(44, 59, 68, 0.98)),
    var(--steel-700);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
}

.course-hero h1 {
  margin: 5px 0;
  color: #fff;
  font-size: 20px;
}

.course-hero p {
  margin: 0;
  color: rgba(238, 243, 245, 0.72);
  font-size: 9px;
}

.course-hero .eyebrow {
  color: #bcd0da;
}

.course-role {
  display: grid;
  gap: 3px;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 11px;
  text-align: right;
}

.course-role small {
  color: #bcd0da;
  font-size: 8px;
}

.course-role strong {
  font-size: 10px;
}

.list-card {
  overflow: hidden;
  border-radius: 13px;
}

.list-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 20px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.list-row:last-child {
  border-bottom: 0;
}

.list-row:hover {
  background: #fafbf9;
}

.list-row h3 {
  margin: 0 0 4px;
  font-size: 11px;
}

.list-row p {
  margin: 0;
  color: var(--ink-550);
  font-size: 8px;
}

.list-row-meta {
  min-width: 130px;
  color: var(--ink-550);
  font-size: 8px;
  text-align: right;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(25, 37, 45, 0.35);
  backdrop-filter: blur(7px);
}

.modal {
  width: min(680px, 100%);
  max-height: min(820px, calc(100vh - 48px));
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
  background: var(--canvas);
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: 18px;
  box-shadow: var(--shadow-lg);
  animation: modal-in 220ms var(--ease);
}

.modal.modal-wide {
  width: min(940px, 100%);
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: translateY(8px) scale(0.99);
  }
}

.modal-header {
  justify-content: space-between;
  gap: 20px;
  padding: 20px 22px 15px;
  border-bottom: 1px solid var(--line);
}

.modal-header h2 {
  font-size: 17px;
}

.modal-body {
  min-height: 0;
  padding: 20px 22px;
  overflow: auto;
}

.modal-footer {
  justify-content: flex-end;
  gap: 8px;
  padding: 14px 22px;
  background: var(--panel);
  border-top: 1px solid var(--line);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 15px;
}

.form-group {
  display: grid;
  align-content: start;
  gap: 6px;
}

.form-group.full {
  grid-column: 1 / -1;
}

.form-section {
  grid-column: 1 / -1;
  margin-top: 8px;
  padding: 14px 0 2px;
  border-top: 1px solid var(--line);
}

.form-section h3 {
  margin: 4px 0 3px;
  font-size: 13px;
}

.form-section p {
  margin: 0;
  color: var(--ink-550);
  font-size: 9px;
  line-height: 1.6;
}

.form-group label {
  color: var(--ink-700);
  font-size: 9px;
  font-weight: 600;
}

.field-hint {
  color: var(--ink-400);
  font-size: 8px;
  line-height: 1.55;
}

.rich-field {
  min-height: 140px;
  padding: 12px;
  overflow: auto;
  background: var(--white);
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  font-size: 11px;
  line-height: 1.75;
  outline: none;
}

.rich-field:focus {
  border-color: var(--steel-600);
  box-shadow: 0 0 0 3px rgba(95, 132, 155, 0.1);
}

.rich-field.compact {
  min-height: 96px;
}

.image-upload {
  min-height: 92px;
  display: grid;
  place-items: center;
  padding: 14px;
  color: var(--ink-550);
  background: var(--white);
  border: 1px dashed var(--line-strong);
  border-radius: 10px;
  font-size: 9px;
  text-align: center;
}

.image-upload.dragging {
  color: var(--steel-700);
  background: var(--steel-100);
  border-color: var(--steel-600);
}

.image-preview {
  position: relative;
  width: fit-content;
  max-width: 100%;
}

.image-preview img {
  max-width: 100%;
  max-height: 220px;
  display: block;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-700);
  font-size: 9px;
}

.checkbox-row.full {
  grid-column: 1 / -1;
}

.checkbox-feature {
  align-items: flex-start;
  padding: 12px;
  background: var(--steel-100);
  border: 1px solid var(--steel-200);
  border-radius: 10px;
}

.checkbox-feature input {
  margin-top: 2px;
  accent-color: var(--steel-700);
}

.checkbox-feature strong,
.checkbox-feature small {
  display: block;
}

.checkbox-feature strong {
  margin-bottom: 2px;
  color: var(--ink-850);
  font-size: 9px;
}

.checkbox-feature small {
  color: var(--ink-550);
  font-size: 8px;
  line-height: 1.5;
}

.tag-score {
  color: var(--ink-700);
  background: var(--panel);
}

.tag-assessment {
  color: var(--green-700);
  background: var(--green-100);
}

.submit-confirm-copy {
  margin: 0;
  color: var(--ink-700);
  font-size: 10px;
  line-height: 1.7;
}

.answer-check-note {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 11px;
  margin-top: 16px;
  padding: 13px;
  color: var(--steel-800);
  background: var(--steel-100);
  border: 1px solid var(--steel-200);
  border-radius: 11px;
}

.answer-check-note > svg {
  width: 19px;
  height: 19px;
}

.answer-check-note strong,
.answer-check-note span {
  display: block;
}

.answer-check-note strong {
  margin-bottom: 3px;
  font-size: 10px;
}

.answer-check-note span {
  color: var(--ink-550);
  font-size: 9px;
  line-height: 1.55;
}

.grading-loading {
  min-height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
}

.grading-loading strong {
  display: block;
  margin-bottom: 5px;
  font-size: 12px;
}

.grading-loading p {
  margin: 0;
  color: var(--ink-550);
  font-size: 9px;
}

.grading-orbit {
  width: 32px;
  height: 32px;
  display: block;
  border: 2px solid var(--steel-200);
  border-top-color: var(--steel-700);
  border-radius: 50%;
  animation: grading-spin 0.8s linear infinite;
}

@keyframes grading-spin {
  to {
    transform: rotate(360deg);
  }
}

.grading-result {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
}

.grading-result-score {
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 22px;
  color: #fff;
  background: var(--steel-800);
}

.grading-result-score > span {
  font-size: 10px;
  font-weight: 600;
}

.grading-result-score strong {
  font-family: var(--mono);
  font-size: 35px;
  font-weight: 500;
  letter-spacing: -0.05em;
}

.grading-result-score small {
  margin-left: 5px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 12px;
  letter-spacing: 0;
}

.grading-result-feedback {
  padding: 22px;
}

.grading-result-feedback > span {
  color: var(--ink-400);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.grading-result-feedback p {
  margin: 12px 0 0;
  color: var(--ink-850);
  font-size: 11px;
  line-height: 1.85;
  white-space: pre-wrap;
}

.grading-failure {
  display: grid;
  justify-items: center;
  gap: 9px;
  padding: 20px;
  text-align: center;
}

.grading-failure svg {
  width: 26px;
  height: 26px;
  color: var(--amber-700);
}

.grading-failure p {
  margin: 0;
  font-size: 11px;
}

.grading-failure span {
  max-width: 460px;
  color: var(--ink-550);
  font-size: 9px;
  line-height: 1.6;
}

.question-picker {
  display: grid;
  gap: 7px;
  max-height: 340px;
  padding-right: 3px;
  overflow: auto;
}

.picker-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 10px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 9px;
}

.picker-row strong {
  display: block;
  font-size: 9px;
}

.picker-row small {
  display: block;
  margin-top: 3px;
  color: var(--ink-400);
  font-size: 8px;
}

.picker-order {
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  color: var(--steel-700);
  background: var(--steel-100);
  border-radius: 7px;
  font-family: var(--mono);
  font-size: 8px;
}

.workspace {
  height: 100%;
  display: grid;
  grid-template-columns: 300px minmax(430px, 1fr) 330px;
  background: #ecefeb;
  transition: grid-template-columns var(--ease);
}

.workspace.question-collapsed {
  grid-template-columns: 0 minmax(430px, 1fr) 330px;
}

.workspace.tutor-collapsed {
  grid-template-columns: 300px minmax(430px, 1fr) 0;
}

.workspace.question-collapsed.tutor-collapsed {
  grid-template-columns: 0 minmax(430px, 1fr) 0;
}

.workspace-panel {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--canvas);
  transition: opacity var(--ease);
}

.workspace.question-collapsed .question-panel,
.workspace.tutor-collapsed .tutor-panel {
  opacity: 0;
  pointer-events: none;
}

.question-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  border-right: 1px solid var(--line);
}

.tutor-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  border-left: 1px solid var(--line);
}

.panel-header {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 15px;
  border-bottom: 1px solid var(--line);
}

.panel-header h2 {
  margin: 3px 0 0;
  font-size: 11px;
}

.question-progress {
  display: flex;
  align-items: center;
  gap: 5px;
}

.question-progress span {
  width: 17px;
  height: 4px;
  background: var(--line);
  border-radius: 999px;
}

.question-progress span.done {
  background: var(--green-700);
}

.question-progress span.current {
  background: var(--amber-500);
}

.question-scroll,
.tutor-scroll {
  min-height: 0;
  overflow: auto;
}

.question-scroll {
  padding: 20px 18px;
}

.question-number {
  color: var(--amber-700);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.08em;
}

.question-scroll h1 {
  margin: 10px 0 16px;
  font-size: 17px;
  line-height: 1.45;
}

.question-stem {
  color: var(--ink-850);
  font-family: var(--hand);
  font-size: 15px;
  line-height: 1.9;
}

.question-stem img {
  max-width: 100%;
}

.question-media {
  display: grid;
  gap: 9px;
  margin: 18px 0;
}

.question-media figure {
  margin: 0;
}

.question-media img {
  width: 100%;
  display: block;
  border: 1px solid var(--line);
  border-radius: 11px;
}

.question-media figcaption {
  margin-top: 5px;
  color: var(--ink-400);
  font-size: 8px;
}

.question-footer {
  padding: 12px 15px;
  color: var(--ink-550);
  background: var(--panel);
  border-top: 1px solid var(--line);
  font-size: 8px;
}

.answer-panel {
  position: relative;
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: 50px minmax(0, 1fr) 56px;
  background: #eef0ed;
}

.workspace-toolbar {
  min-width: 0;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 11px;
  background: rgba(251, 251, 249, 0.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.workspace-mode-tabs {
  flex: 0 0 auto;
  gap: 3px;
  padding: 3px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 9px;
}

.workspace-mode-tabs button {
  height: 29px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  color: var(--ink-550);
  background: transparent;
  border: 0;
  border-radius: 7px;
  font-size: 9px;
}

.workspace-mode-tabs button.active {
  color: var(--steel-800);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.format-tools,
.board-tools {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

.format-tools::-webkit-scrollbar,
.board-tools::-webkit-scrollbar {
  display: none;
}

.tool-divider {
  width: 1px;
  height: 21px;
  flex: 0 0 auto;
  margin: 0 4px;
  background: var(--line);
}

.tool-button {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  padding: 0;
  color: var(--ink-550);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 7px;
}

.tool-button:hover,
.tool-button.active {
  color: var(--steel-800);
  background: var(--steel-100);
  border-color: var(--steel-200);
}

.tool-button svg {
  width: 15px;
  height: 15px;
}

.color-input {
  width: 27px;
  height: 27px;
  flex: 0 0 auto;
  padding: 3px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 7px;
}

.width-select {
  width: 54px;
  height: 29px;
  flex: 0 0 auto;
  padding: 0 4px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 7px;
  font-size: 8px;
}

.answer-stage {
  position: relative;
  min-width: 0;
  min-height: 0;
  padding: 18px;
  overflow: auto;
}

.paper-editor {
  width: min(820px, 100%);
  min-height: calc(100% - 4px);
  margin: 0 auto;
  padding: 42px 50px 90px;
  color: var(--ink-950);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 4px;
  box-shadow: 0 8px 32px rgba(25, 37, 45, 0.07);
  font-size: 14px;
  line-height: 1.85;
  outline: none;
}

.paper-editor:empty::before {
  color: var(--ink-400);
  content: attr(data-placeholder);
  pointer-events: none;
}

.paper-editor h1,
.paper-editor h2,
.paper-editor h3 {
  line-height: 1.4;
}

.board-wrap {
  position: relative;
  width: min(1000px, 100%);
  min-height: 100%;
  margin: 0 auto;
  overflow: hidden;
  background-color: var(--white);
  background-image:
    linear-gradient(#edf0ed 1px, transparent 1px),
    linear-gradient(90deg, #edf0ed 1px, transparent 1px);
  background-size: 24px 24px;
  border: 1px solid var(--line);
  border-radius: 5px;
  box-shadow: 0 8px 32px rgba(25, 37, 45, 0.07);
  touch-action: none;
}

.board-canvas {
  width: 100%;
  height: 100%;
  min-height: 560px;
  display: block;
  cursor: crosshair;
  touch-action: none;
}

.answer-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 13px;
  background: var(--canvas);
  border-top: 1px solid var(--line);
}

.answer-footer-note {
  color: var(--ink-550);
  font-size: 8px;
}

.answer-footer-note strong {
  color: var(--ink-700);
}

.tutor-status {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--green-700);
  font-size: 8px;
}

.tutor-status::before {
  width: 6px;
  height: 6px;
  background: currentColor;
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(46, 120, 97, 0.08);
  content: "";
}

.tutor-scroll {
  padding: 16px 14px 22px;
}

.tutor-intro {
  margin-bottom: 18px;
  padding: 12px;
  color: var(--ink-550);
  background: var(--steel-100);
  border: 1px solid var(--steel-200);
  border-radius: 11px;
  font-size: 9px;
  line-height: 1.65;
}

.tutor-message {
  display: grid;
  gap: 5px;
  margin-bottom: 14px;
}

.tutor-message.student {
  justify-items: end;
}

.message-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 4px;
  color: var(--ink-400);
  font-size: 8px;
}

.message-bubble {
  max-width: 90%;
  padding: 10px 11px;
  color: var(--ink-850);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 4px 12px 12px 12px;
  font-size: 10px;
  line-height: 1.65;
  white-space: pre-wrap;
}

.tutor-message.student .message-bubble {
  color: #fff;
  background: var(--steel-700);
  border-color: var(--steel-700);
  border-radius: 12px 4px 12px 12px;
}

.tutor-thinking {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 4px;
  color: var(--ink-400);
  font-size: 8px;
}

.tutor-thinking span {
  width: 5px;
  height: 5px;
  background: var(--ink-400);
  border-radius: 50%;
  animation: bounce 1.1s infinite;
}

.tutor-thinking span:nth-child(2) {
  animation-delay: 0.15s;
}

.tutor-thinking span:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes bounce {
  50% {
    opacity: 0.35;
    transform: translateY(-3px);
  }
}

.tutor-composer {
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 7px;
  padding: 11px;
  background: var(--panel);
  border-top: 1px solid var(--line);
}

.privacy-consent {
  flex: 0 0 100%;
  display: flex;
  align-items: flex-start;
  gap: 7px;
  margin-bottom: 8px;
  color: var(--ink-550);
  font-size: 8px;
  line-height: 1.45;
}

.privacy-consent input {
  margin: 2px 0 0;
  accent-color: var(--steel-700);
}

.tutor-composer textarea {
  min-height: 38px;
  max-height: 100px;
  flex: 1;
  padding: 9px 10px;
  resize: none;
  background: var(--white);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  outline: none;
  font-size: 9px;
  line-height: 1.5;
}

.tutor-composer textarea:focus {
  border-color: var(--steel-600);
}

.tutor-composer .icon-button {
  color: #fff;
  background: var(--steel-700);
  border-color: var(--steel-700);
}

.toast-region {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 1500;
  width: min(340px, calc(100vw - 36px));
  display: grid;
  gap: 8px;
  pointer-events: none;
}

.toast {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 9px;
  padding: 12px;
  color: var(--ink-850);
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  animation: toast-in 230ms var(--ease);
  pointer-events: auto;
}

.toast.tutor {
  border-left: 3px solid var(--amber-500);
}

.toast.error {
  border-left: 3px solid var(--red-600);
}

.toast-icon {
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  color: var(--steel-700);
  background: var(--steel-100);
  border-radius: 7px;
}

.toast strong {
  display: block;
  margin-bottom: 3px;
  font-size: 9px;
}

.toast p {
  margin: 0;
  color: var(--ink-550);
  font-size: 8px;
  line-height: 1.55;
}

.toast button {
  padding: 0;
  color: var(--ink-400);
  background: none;
  border: 0;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(7px);
  }
}

.result-summary {
  gap: 9px;
  margin-bottom: 16px;
}

.summary-chip {
  flex: 1;
  padding: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.summary-chip strong {
  display: block;
  font-family: var(--mono);
  font-size: 16px;
}

.summary-chip span {
  color: var(--ink-550);
  font-size: 8px;
}

.final-answer {
  padding: 14px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.final-answer + .final-answer {
  margin-top: 12px;
}

.final-answer h4 {
  margin: 0 0 10px;
  font-size: 10px;
}

.grading-card {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 18px;
  margin-top: 12px;
  padding: 15px;
  background: var(--steel-100);
  border: 1px solid var(--steel-200);
  border-radius: 10px;
}

.grading-card.muted {
  display: block;
  color: var(--ink-400);
  background: var(--panel);
  border-color: var(--line);
  font-size: 8px;
}

.grading-score span,
.grading-score strong {
  display: block;
}

.grading-score span {
  margin-bottom: 5px;
  color: var(--steel-700);
  font-size: 8px;
  font-weight: 600;
}

.grading-score strong {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 500;
}

.grading-score small {
  color: var(--ink-550);
  font-size: 10px;
}

.grading-card p {
  margin: 0;
  color: var(--ink-700);
  font-size: 9px;
  line-height: 1.7;
  white-space: pre-wrap;
}

.final-board {
  width: 100%;
  min-height: 260px;
  background:
    linear-gradient(#edf0ed 1px, transparent 1px),
    linear-gradient(90deg, #edf0ed 1px, transparent 1px),
    #fff;
  background-size: 24px 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

@media (max-width: 1080px) {
  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .workspace {
    grid-template-columns: 270px minmax(400px, 1fr) 300px;
  }

  .workspace.question-collapsed {
    grid-template-columns: 0 minmax(400px, 1fr) 300px;
  }

  .workspace.tutor-collapsed {
    grid-template-columns: 270px minmax(400px, 1fr) 0;
  }
}

@media (max-width: 680px) {
  .grading-result,
  .grading-card {
    grid-template-columns: 1fr;
  }

  .grading-result-score {
    min-height: 120px;
  }
}

@media (max-width: 820px) {
  .topbar {
    padding: 0 10px;
  }

  .brand-copy,
  .topbar-divider,
  #user-label,
  .breadcrumbs span:not(:last-child) {
    display: none;
  }

  .save-state {
    width: 16px;
    height: 32px;
    justify-content: center;
    margin: 0;
  }

  .save-state span:last-child {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .dashboard-layout {
    grid-template-columns: 1fr;
  }

  .side-nav {
    position: static;
    width: 100%;
    height: auto;
    flex-direction: row;
    gap: 4px;
    padding: 8px 10px;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .side-nav .nav-section-label,
  .side-nav-footer {
    display: none;
  }

  .side-nav button {
    width: auto;
    flex: 0 0 auto;
    padding: 0 12px;
  }

  .side-nav button.active {
    box-shadow: var(--shadow-sm), inset 0 -3px 0 var(--steel-600);
  }

  .content-wrap {
    padding: 24px 17px 50px;
  }

  .page-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .cards-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .form-group.full {
    grid-column: auto;
  }

  .workspace,
  .workspace.question-collapsed,
  .workspace.tutor-collapsed,
  .workspace.question-collapsed.tutor-collapsed {
    position: relative;
    grid-template-columns: 1fr;
  }

  .answer-panel {
    grid-column: 1;
    grid-row: 1;
  }

  .question-panel,
  .tutor-panel {
    position: absolute;
    top: 0;
    bottom: 0;
    z-index: 50;
    width: min(360px, 90vw);
    box-shadow: var(--shadow-lg);
  }

  .question-panel {
    left: 0;
  }

  .tutor-panel {
    right: 0;
  }

  .workspace.question-collapsed .question-panel {
    transform: translateX(-105%);
  }

  .workspace.tutor-collapsed .tutor-panel {
    transform: translateX(105%);
  }

  .workspace-panel {
    transition: transform var(--ease), opacity var(--ease);
  }

  .paper-editor {
    padding: 30px 24px 70px;
  }

  .format-tools,
  .board-tools {
    max-width: calc(100vw - 160px);
  }
}

@media (max-width: 560px) {
  .metric-grid,
  .cards-grid {
    grid-template-columns: 1fr;
  }

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

  .course-role {
    text-align: left;
  }

  .list-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .list-row-meta {
    text-align: left;
  }

  .modal-backdrop {
    align-items: end;
    padding: 0;
  }

  .modal,
  .modal.modal-wide {
    width: 100%;
    max-height: 92vh;
    border-radius: 18px 18px 0 0;
  }

  .workspace-mode-tabs button span {
    display: none;
  }

  .answer-stage {
    padding: 8px;
  }

  .paper-editor {
    padding: 24px 17px 60px;
  }
}

/* ============================================================
   AISI CIS surfaces
   The layout stays Solve-specific; visual tokens follow aisi.tw exactly.
============================================================ */
.topbar {
  color: var(--cis-bar-fg);
  background: var(--cis-bar-bg);
  border-color: var(--cis-bar-border);
  box-shadow: 0 4px 18px rgba(26, 46, 59, 0.06);
  backdrop-filter: blur(20px) saturate(1.3);
}

.topbar .brand-copy small,
.topbar .breadcrumbs,
.topbar .save-state,
.topbar .user-chip,
.topbar .icon-button {
  color: var(--cis-bar-muted);
}

.topbar .breadcrumbs strong,
.topbar .icon-button:hover,
.topbar .user-chip:hover {
  color: var(--cis-bar-fg);
}

.topbar .icon-button:hover,
.topbar .user-chip:hover {
  background: var(--cis-bar-ghost);
  border-color: var(--cis-bar-border);
}

.topbar-divider {
  background: var(--cis-bar-border);
}

.topbar .avatar {
  color: var(--cis-logo-1);
  background: var(--cis-bar-ghost);
  border-color: var(--cis-bar-border);
}

.side-nav {
  background: var(--cis-sidebar);
  border-color: var(--cis-divider);
  backdrop-filter: blur(18px) saturate(1.2);
}

.side-nav button:hover {
  background: var(--cis-hover);
}

.side-nav button.active {
  color: var(--cis-primary-deep);
  background: var(--cis-card-bg);
  box-shadow: var(--shadow-sm), inset 3px 0 0 var(--cis-primary);
}

.page-heading h1,
.course-hero h1,
.modal-header h2,
.panel-header h2,
.empty-state h3 {
  font-family: var(--tc);
  font-weight: 400;
  letter-spacing: 0.01em;
}

.button-primary {
  color: var(--cis-action-fg);
  background: var(--cis-action-grad);
  border-color: var(--cis-action-bd);
  border-radius: 999px;
  box-shadow:
    0 6px 16px var(--cis-action-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.38);
}

.button-primary:hover {
  background: var(--cis-action-grad);
  filter: brightness(1.04);
  box-shadow:
    0 8px 20px var(--cis-action-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.38);
}

.button-secondary {
  background: var(--cis-bar-ghost);
  border-color: var(--cis-field-bd);
  border-radius: 999px;
}

.button-secondary:hover {
  color: var(--cis-primary-deep);
  background: var(--cis-primary-soft);
  border-color: var(--cis-primary);
}

.metric-card,
.panel-card,
.list-card,
.activity-card,
.question-card,
.paper-card,
.grading-result,
.final-answer,
.summary-chip,
.picker-row,
.empty-state {
  background: var(--cis-card-bg);
  border-color: var(--cis-card-bd);
  box-shadow: var(--shadow-sm), var(--cis-card-inset);
  backdrop-filter: blur(14px) saturate(1.25);
}

.question-card:hover,
.paper-card:hover,
.activity-card:hover {
  border-color: var(--cis-card-bd);
  box-shadow: 0 14px 30px var(--cis-action-glow), var(--cis-card-inset);
}

.metric-icon,
.empty-icon,
.toast-icon,
.picker-order {
  color: var(--cis-primary);
  background: var(--cis-primary-soft);
}

.card-kicker,
.grading-score span {
  color: var(--cis-primary);
}

.list-row:hover {
  background: var(--cis-hover);
}

.field,
.search-field input,
.select,
.rich-field,
.image-upload,
.width-select,
.tutor-composer textarea {
  background: var(--cis-card-bg);
  border-color: var(--cis-field-bd);
}

.field:focus,
.search-field input:focus,
.select:focus,
.rich-field:focus,
.tutor-composer textarea:focus {
  border-color: var(--cis-primary);
  box-shadow: 0 0 0 3px var(--cis-primary-soft);
}

.course-hero,
.grading-result-score {
  background: var(--cis-banner);
}

.modal-backdrop {
  background: var(--cis-overlay);
}

.modal,
.toast {
  background: var(--cis-card-bg);
  border-color: var(--cis-card-bd);
  box-shadow: var(--shadow-lg), var(--cis-card-inset);
  backdrop-filter: blur(22px) saturate(1.25);
}

.workspace {
  background: var(--cis-workspace);
}

.workspace-panel,
.answer-footer {
  background: var(--cis-card-solid);
}

.answer-panel {
  background: var(--cis-workspace);
}

.workspace-toolbar {
  background: var(--cis-toolbar);
  backdrop-filter: blur(16px) saturate(1.25);
}

.workspace-mode-tabs button.active {
  color: var(--cis-primary-deep);
  background: var(--cis-card-solid);
}

.tool-button:hover,
.tool-button.active {
  color: var(--cis-primary-deep);
  background: var(--cis-primary-soft);
  border-color: var(--cis-primary);
}

.paper-editor {
  color: var(--cis-paper-ink);
  background: var(--cis-paper);
  border-color: var(--cis-card-bd);
  box-shadow: var(--shadow-md);
}

.board-wrap,
.final-board {
  background-color: #fff;
  background-image:
    linear-gradient(var(--cis-board-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--cis-board-grid) 1px, transparent 1px);
  border-color: var(--cis-field-bd);
  box-shadow: var(--shadow-md);
}

.tutor-intro,
.grading-card {
  background: var(--cis-primary-soft);
  border-color: var(--cis-primary);
}

.tutor-message.student .message-bubble,
.tutor-composer .icon-button {
  color: var(--cis-action-fg);
  background: var(--cis-action-grad);
  border-color: var(--cis-action-bd);
}

.notification-badge {
  color: var(--cis-action-fg);
  background: var(--cis-action-grad);
  border-color: var(--cis-card-solid);
  box-shadow: 0 3px 9px var(--cis-action-glow);
}

[data-theme="dark"] {
  --steel-200: rgba(110, 154, 181, 0.24);
}

[data-theme="dark"] .grading-result-score,
[data-theme="dark"] .course-hero {
  color: #eef4f8;
}

[data-theme="dark"] .question-stem,
[data-theme="dark"] .paper-editor {
  color: var(--cis-paper-ink);
}

@media (max-width: 820px) {
  .side-nav button.active {
    box-shadow: var(--shadow-sm), inset 0 -3px 0 var(--cis-primary);
  }
}