:root {
  color-scheme: dark;
  --paper: #090d0e;
  --paper-2: #111716;
  --paper-3: #1a2321;
  --ink: #f1e9dc;
  --ink-soft: #cbbfb0;
  --muted: #8f867b;
  --line: rgba(241, 233, 220, 0.13);
  --line-strong: rgba(241, 233, 220, 0.25);
  --charcoal: #050809;
  --charcoal-2: #0d1414;
  --clay: #d68462;
  --clay-soft: rgba(214, 132, 98, 0.17);
  --gold: #d1a854;
  --gold-soft: rgba(209, 168, 84, 0.18);
  --teal: #69b7ad;
  --teal-soft: rgba(105, 183, 173, 0.16);
  --blue: #79a9c8;
  --blue-soft: rgba(121, 169, 200, 0.15);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.48);
  --radius: 16px;
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html,
body { min-height: 100%; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  font-family: var(--sans);
  background:
    radial-gradient(circle at 12% 4%, rgba(214, 132, 98, 0.12), transparent 28%),
    radial-gradient(circle at 82% 8%, rgba(105, 183, 173, 0.12), transparent 30%),
    linear-gradient(90deg, rgba(241, 233, 220, 0.035) 1px, transparent 1px),
    linear-gradient(180deg, rgba(241, 233, 220, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: auto, auto, 34px 34px, 34px 34px, auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(28, 39, 37, 0.72), transparent 440px);
  z-index: -1;
}

a { color: inherit; }

p, h1, h2, h3, h4, ul, ol, blockquote, figure, pre { margin: 0; }

button,
textarea,
input { font: inherit; }

.overline {
  color: var(--gold);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-lockup.compact {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.brand-sigil {
  position: relative;
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: conic-gradient(from 120deg, var(--teal-soft), var(--gold-soft), var(--clay-soft), var(--teal-soft));
}

.brand-sigil::before,
.brand-sigil::after {
  content: "";
  position: absolute;
  left: 9px;
  right: 9px;
  top: 17px;
  height: 2px;
  border-radius: 999px;
  background: var(--teal);
}

.brand-sigil::after {
  transform: rotate(90deg);
  background: var(--clay);
}

.brand-title {
  margin-top: 2px;
  font-family: var(--serif);
  font-size: 1.16rem;
  line-height: 1.05;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.055);
  text-decoration: none;
  cursor: pointer;
}

.button.primary {
  border-color: rgba(105, 183, 173, 0.34);
  background: var(--teal-soft);
}

.button.ghost {
  color: var(--ink-soft);
}

.button.small {
  min-height: 32px;
  padding: 0 10px;
  font-size: 0.82rem;
}

.button:focus-visible,
.icon-button:focus-visible,
.view-tab:focus-visible,
.module-nav button:focus-visible,
.module-nav a:focus-visible,
textarea:focus-visible {
  outline: 2px solid rgba(105, 183, 173, 0.58);
  outline-offset: 2px;
}

.public-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.public-hero {
  width: min(1120px, 100%);
  min-height: 620px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 28px;
  padding: clamp(34px, 6vw, 76px);
  border: 1px solid var(--line);
  border-radius: 30px;
  background: rgba(14, 20, 20, 0.88);
  box-shadow: var(--shadow);
}

.public-hero h1 {
  max-width: 920px;
  font-family: var(--serif);
  font-size: clamp(3.2rem, 7vw, 7rem);
  line-height: 0.92;
  letter-spacing: -0.055em;
}

.hero-lede {
  max-width: 760px;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.8vw, 1.42rem);
}

.hero-actions,
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.public-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.public-strip span {
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.045);
  font-size: 0.82rem;
}

.app-body {
  height: 100vh;
  overflow: hidden;
}

.app-shell,
.admin-shell {
  height: 100vh;
  display: grid;
  grid-template-columns: 276px minmax(0, 1fr);
  gap: 16px;
  padding: 16px;
}

.student-shell {
  grid-template-columns: clamp(252px, 22vw, 304px) minmax(0, 1fr);
}

.student-shell.rail-collapsed {
  grid-template-columns: 0 minmax(0, 1fr);
  gap: 0;
}

.admin-shell {
  grid-template-columns: 276px minmax(0, 1fr);
}

.course-rail,
.inspector,
.workspace {
  min-height: 0;
  border: 1px solid var(--line);
  background: rgba(14, 20, 20, 0.82);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.course-rail {
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow: hidden;
  padding: 14px;
  border-radius: 24px;
  transition: opacity 160ms ease, transform 160ms ease;
}

.student-shell.rail-collapsed .course-rail {
  width: 0;
  padding: 0;
  border-width: 0;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-8px);
  visibility: hidden;
}

.rail-top {
  display: flex;
  align-items: stretch;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.rail-top .brand-lockup.compact {
  flex: 1 1 auto;
  min-width: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.icon-button {
  position: relative;
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.045);
  cursor: pointer;
}

.icon-button:hover {
  border-color: var(--line-strong);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.075);
}

.rail-icon {
  display: grid;
  gap: 4px;
  width: 16px;
}

.rail-icon span {
  display: block;
  height: 1px;
  border-radius: 999px;
  background: currentColor;
}

.student-chip {
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.045);
  font-family: var(--mono);
  font-size: 0.72rem;
  overflow-wrap: anywhere;
}

.module-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow: auto;
  padding-right: 4px;
  scrollbar-width: thin;
  scrollbar-color: rgba(241, 233, 220, 0.28) transparent;
}

.module-nav button,
.module-nav a {
  width: 100%;
  padding: 8px 9px;
  border: 1px solid transparent;
  border-radius: 11px;
  color: var(--ink-soft);
  background: transparent;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}

.module-nav button:hover,
.module-nav a:hover {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.055);
}

.module-nav button.active {
  border-color: rgba(105, 183, 173, 0.3);
  color: var(--ink);
  background: var(--teal-soft);
}

.nav-part {
  margin: 11px 4px 3px;
  color: var(--gold);
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.nav-progress {
  float: right;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.workspace {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: 24px;
}

.workspace-header {
  flex: 0 0 auto;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 24px 18px;
  border-bottom: 1px solid var(--line);
}

.workspace-title {
  flex: 1 1 auto;
  min-width: 0;
}

.workspace-header h1 {
  margin-top: 6px;
  font-family: var(--serif);
  font-size: clamp(1.9rem, 3vw, 3.15rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.rail-open {
  display: none;
  margin-top: 2px;
}

.student-shell.rail-collapsed .rail-open {
  display: inline-flex;
}

.workspace-modebar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 8, 9, 0.2);
}

.view-switcher {
  display: inline-grid;
  grid-template-columns: repeat(4, minmax(92px, 1fr));
  width: min(560px, 100%);
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(5, 8, 9, 0.36);
}

.view-tab {
  min-height: 32px;
  padding: 0 11px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--muted);
  background: transparent;
  font-size: 0.82rem;
  cursor: pointer;
}

.view-tab:hover {
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.045);
}

.view-tab.active {
  border-color: rgba(105, 183, 173, 0.28);
  color: var(--ink);
  background: var(--teal-soft);
}

.workspace-viewports {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}

.workspace-view {
  height: 100%;
  overflow: auto;
  padding: 26px;
}

.utility-pane {
  padding: 16px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.module-card {
  min-height: 180px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.045);
}

.module-card h2,
.reader-content h2,
.reader-content h3,
.reader-content h4 {
  font-family: var(--serif);
  line-height: 1.08;
}

.module-card h2 {
  font-size: 1.34rem;
}

.module-card p,
.reader-content {
  color: var(--ink-soft);
}

.reader-content {
  max-width: 960px;
  font-size: 1rem;
  line-height: 1.62;
}

.reader-content > * + * { margin-top: 16px; }

.reader-content h2 {
  color: var(--ink);
  font-size: 2rem;
}

.reader-content h3 {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink);
  font-size: 1.5rem;
}

.reader-content h4 {
  color: var(--teal);
  font-size: 1.18rem;
}

.reader-content ul,
.reader-content ol {
  display: grid;
  gap: 8px;
  padding-left: 1.35rem;
}

.reader-content li::marker { color: var(--gold); }

.reader-content blockquote {
  padding: 18px 20px;
  border: 1px solid rgba(209, 168, 84, 0.3);
  border-left: 4px solid var(--gold);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--gold-soft);
}

.reader-content blockquote p {
  font-family: var(--serif);
  font-size: 1.24rem;
  line-height: 1.35;
}

.reader-content code {
  padding: 0.1em 0.34em;
  border: 1px solid rgba(241, 233, 220, 0.12);
  border-radius: 7px;
  color: #e8bf64;
  background: rgba(255, 255, 255, 0.06);
  font: 0.9em var(--mono);
}

.reader-content pre {
  overflow: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--charcoal);
}

.inspector {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: auto;
  padding: 12px;
  border-radius: 24px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.045);
}

.utility-panel {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: 20px;
  background: rgba(14, 20, 20, 0.58);
}

.panel-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.notes-box,
.nugget-textarea,
.feedback-box {
  width: 100%;
  min-height: 190px;
  resize: vertical;
  padding: 13px;
  border: 0;
  color: var(--ink);
  background: transparent;
  line-height: 1.5;
}

.utility-panel .notes-box {
  flex: 1 1 auto;
  min-height: 0;
  resize: none;
}

.utility-panel .nugget-pane,
.utility-panel .materials-pane {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  align-content: start;
  padding: 16px;
}

.utility-panel .nugget-textarea {
  min-height: min(42vh, 420px);
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(5, 8, 9, 0.28);
}

.notes-box::placeholder,
.nugget-textarea::placeholder,
.feedback-box::placeholder { color: rgba(203, 191, 176, 0.52); }

.nugget-pane,
.materials-pane {
  display: grid;
  gap: 12px;
  padding: 13px;
}

.nugget-prompt,
.material-row,
.empty-state,
.student-row,
.submission-row {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: rgba(5, 8, 9, 0.42);
}

.nugget-prompt {
  color: var(--ink-soft);
  font-size: 0.93rem;
}

.panel-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.admin-grid {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(360px, 1.4fr) minmax(260px, 0.8fr);
  gap: 14px;
  padding: 16px;
}

.review-list,
.review-pane,
.students-pane {
  min-height: 0;
  overflow: hidden;
}

.submission-list,
.student-list,
.review-pane-inner {
  height: calc(100% - 47px);
  overflow: auto;
  padding: 12px;
}

.submission-row {
  width: 100%;
  margin-bottom: 8px;
  color: var(--ink-soft);
  text-align: left;
  cursor: pointer;
}

.submission-row.active {
  border-color: rgba(105, 183, 173, 0.3);
  color: var(--ink);
  background: var(--teal-soft);
}

.submission-row strong,
.student-row strong,
.material-row strong {
  display: block;
  margin-bottom: 5px;
  color: var(--ink);
}

.meta-line {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.7rem;
  overflow-wrap: anywhere;
}

.review-copy {
  display: grid;
  gap: 12px;
  color: var(--ink-soft);
  line-height: 1.55;
}

@media (max-width: 1180px) {
  .student-shell {
    grid-template-columns: 230px minmax(0, 1fr);
  }

  .student-shell.rail-collapsed {
    grid-template-columns: 0 minmax(0, 1fr);
  }

  .inspector {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    max-height: 360px;
  }

  .admin-grid {
    grid-template-columns: 1fr;
    overflow: auto;
  }
}

@media (max-width: 780px) {
  .app-body {
    height: auto;
    overflow: auto;
  }

  .app-shell,
  .admin-shell {
    height: auto;
    display: block;
    padding: 12px;
  }

  .student-shell {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .student-shell.rail-collapsed {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .student-shell.rail-collapsed .course-rail {
    display: none;
  }

  .course-rail,
  .workspace,
  .inspector {
    margin-bottom: 12px;
    border-radius: 20px;
  }

  .module-nav {
    max-height: 260px;
  }

  .workspace-header {
    align-items: flex-start;
    display: flex;
    padding: 18px;
  }

  .workspace-modebar {
    overflow-x: auto;
    padding: 9px 10px;
  }

  .view-switcher {
    width: 100%;
    grid-template-columns: repeat(4, minmax(72px, 1fr));
  }

  .view-tab {
    padding: 0 8px;
    font-size: 0.76rem;
  }

  .workspace-view { padding: 18px; }

  .utility-pane { padding: 12px; }

  .dashboard-grid,
  .inspector {
    display: grid;
    grid-template-columns: 1fr;
  }

  .public-hero {
    min-height: auto;
    border-radius: 24px;
    padding: 28px;
  }

  .public-hero h1 {
    font-size: clamp(3rem, 16vw, 4.3rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}