:root {
  color-scheme: light;
  --color-bg: oklch(1 0 0);
  --color-ink: oklch(0.16 0.006 260);
  --color-muted: oklch(0.43 0.012 260);
  --color-line: oklch(0.88 0.006 260);
  --color-surface: oklch(0.97 0.003 260);
  --color-panel: oklch(0.93 0.006 260);
  --color-primary: oklch(0.42 0.13 255);
  --color-primary-strong: oklch(0.31 0.12 255);
  --color-accent: oklch(0.82 0.15 88);
  --color-accent-strong: oklch(0.69 0.14 82);
  --color-success: oklch(0.53 0.14 132);
  --color-danger: oklch(0.55 0.19 28);
  --color-warning: oklch(0.72 0.16 72);
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius: 8px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--color-bg);
}

body {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  background: var(--color-bg);
}

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

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

img {
  max-width: 100%;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.08;
  text-wrap: balance;
}

p {
  color: var(--color-muted);
  text-wrap: pretty;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-height);
  padding: 12px clamp(18px, 4vw, 52px);
  border-bottom: 1px solid var(--color-line);
  background: oklch(1 0 0 / 0.94);
  backdrop-filter: blur(10px);
}

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

.brand-link strong {
  display: block;
  font-size: 18px;
}

.brand-link small {
  display: block;
  color: var(--color-muted);
  font-size: 12px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav > a,
.site-nav form,
.language-switcher a,
.app-tabs a,
.admin-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 8px 12px;
  border-radius: var(--radius);
  color: var(--color-muted);
  font-weight: 650;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a.is-active,
.app-tabs a.is-active,
.admin-nav a.is-active {
  color: var(--color-primary-strong);
  background: oklch(0.94 0.025 255);
}

.language-switcher {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.language-switcher a {
  min-height: 30px;
  padding: 4px 8px;
  font-size: 12px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--color-ink);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 750;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid oklch(0.82 0.15 88 / 0.75);
  outline-offset: 2px;
}

.button-primary {
  color: oklch(1 0 0);
  background: var(--color-primary);
}

.button-primary:hover {
  background: var(--color-primary-strong);
}

.button-secondary {
  color: var(--color-primary-strong);
  border-color: oklch(0.72 0.08 255);
  background: oklch(0.96 0.016 255);
}

.button-secondary:hover {
  border-color: var(--color-primary);
  background: oklch(0.93 0.035 255);
}

.button-ghost {
  color: var(--color-muted);
  border-color: var(--color-line);
  background: var(--color-bg);
}

.button-small {
  min-height: 36px;
  padding: 7px 12px;
  font-size: 14px;
}

.button-full {
  width: 100%;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(320px, 0.96fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  min-height: calc(100svh - var(--header-height) - 36px);
  padding: clamp(40px, 8vw, 88px) clamp(18px, 5vw, 72px) 36px;
  border-bottom: 1px solid var(--color-line);
}

.hero h1 {
  max-width: 11ch;
  margin-bottom: 20px;
  font-size: clamp(44px, 6vw, 76px);
  letter-spacing: 0;
}

.hero p {
  max-width: 68ch;
  font-size: 18px;
}

.kicker {
  color: var(--color-primary-strong);
  font-size: 13px;
  font-weight: 800;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-visual {
  min-height: 430px;
  display: grid;
  align-items: center;
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, oklch(0.16 0.006 260) 0 58%, oklch(0.43 0.13 255) 58% 100%);
}

.screen-shell {
  width: min(520px, calc(100% - 40px));
  margin: auto;
  overflow: hidden;
  border: 1px solid oklch(0.88 0.006 260 / 0.5);
  border-radius: var(--radius);
  background: oklch(0.98 0.002 260);
}

.screen-top {
  display: flex;
  gap: 7px;
  padding: 14px;
  border-bottom: 1px solid var(--color-line);
  background: oklch(0.93 0.006 260);
}

.screen-top span {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--color-muted);
}

.screen-grid {
  display: grid;
  gap: 14px;
  padding: 22px;
}

.screen-panel {
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.screen-panel.is-blue {
  color: oklch(1 0 0);
  border-color: var(--color-primary);
  background: var(--color-primary);
}

.screen-panel small {
  display: block;
  color: inherit;
  opacity: 0.76;
}

.screen-line {
  height: 12px;
  border-radius: 999px;
  background: var(--color-panel);
}

.screen-line.is-short {
  width: 62%;
}

.screen-progress {
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--color-panel);
}

.screen-progress span {
  display: block;
  height: 100%;
  background: var(--color-accent);
}

.section-band,
.split-section,
.faq-section,
.page-shell,
.app-shell {
  padding: clamp(32px, 6vw, 72px) clamp(18px, 5vw, 72px);
}

.section-band {
  border-bottom: 1px solid var(--color-line);
  background: var(--color-surface);
}

.section-heading {
  max-width: 820px;
  margin-bottom: 28px;
}

.section-heading h2,
.page-title h1,
.campus-hero h1 {
  margin-bottom: 10px;
  font-size: clamp(30px, 4vw, 48px);
}

.feature-grid,
.plan-grid,
.dashboard-grid,
.metric-grid,
.slot-grid,
.plan-editor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 14px;
}

.feature-grid article,
.plan-card,
.panel,
.auth-panel {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.feature-grid article,
.plan-card,
.panel {
  padding: 20px;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 1.1fr);
  gap: clamp(24px, 5vw, 64px);
  align-items: start;
}

.check-list,
.plan-card ul,
.resource-list,
.task-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.check-list li,
.plan-card li {
  position: relative;
  padding-left: 24px;
}

.check-list li::before,
.plan-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--color-accent);
}

.level-stack,
.content-list,
.student-list {
  display: grid;
  gap: 12px;
}

.level-stack article,
.unit-row {
  display: grid;
  gap: 4px;
  padding: 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.price-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 18px 0;
}

.price-row strong {
  font-size: 30px;
}

.faq-section details {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-line);
}

.faq-section summary {
  cursor: pointer;
  font-weight: 800;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(18px, 5vw, 72px);
  border-top: 1px solid var(--color-line);
  background: var(--color-ink);
  color: oklch(1 0 0);
}

.site-footer span,
.site-footer a {
  color: oklch(0.88 0.006 260);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.auth-shell {
  display: grid;
  place-items: center;
  min-height: calc(100svh - var(--header-height));
  padding: 36px 18px;
  background: var(--color-surface);
}

.auth-panel {
  width: min(520px, 100%);
  padding: 24px;
}

.stack-form,
.assignment-form,
.inline-review {
  display: grid;
  gap: 14px;
}

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

label,
legend {
  display: grid;
  gap: 6px;
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 750;
}

input,
select,
textarea {
  width: 100%;
  min-height: 42px;
  padding: 9px 11px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  color: var(--color-ink);
  background: var(--color-bg);
}

textarea {
  resize: vertical;
}

.honeypot {
  position: absolute;
  left: -9999px;
}

.check-control {
  grid-template-columns: auto 1fr;
  align-items: center;
}

.check-control input {
  width: 18px;
  min-height: 18px;
}

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

.segmented-field legend {
  grid-column: 1 / -1;
}

.segmented-field label {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.segmented-field input {
  width: 18px;
  min-height: 18px;
}

.auth-hint,
.muted-note {
  color: var(--color-muted);
  font-size: 14px;
}

.campus-hero,
.page-title {
  display: grid;
  gap: 18px;
  margin-bottom: 24px;
}

.app-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.metric-grid article {
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.metric-grid span {
  display: block;
  color: var(--color-muted);
  font-size: 13px;
}

.metric-grid strong {
  display: block;
  margin-top: 8px;
  font-size: 26px;
}

.dashboard-grid {
  margin-top: 16px;
}

.compact-list {
  display: grid;
  gap: 10px;
  margin: 0;
}

.compact-list div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
}

.compact-list dt {
  color: var(--color-muted);
}

.compact-list dd {
  margin: 0;
  font-weight: 750;
}

.task-list li,
.resource-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-line);
}

.task-list small,
.resource-list small {
  color: var(--color-muted);
}

.selector-row {
  max-width: 420px;
  margin-bottom: 18px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
}

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

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 9px;
  border-radius: 999px;
  color: var(--color-ink);
  background: var(--color-panel);
  font-size: 12px;
  font-weight: 800;
}

.status-approved,
.status-confirmed {
  color: oklch(1 0 0);
  background: var(--color-success);
}

.status-pending {
  color: var(--color-ink);
  background: var(--color-accent);
}

.status-rejected {
  color: oklch(1 0 0);
  background: var(--color-danger);
}

.status-revision_requested {
  color: var(--color-ink);
  background: oklch(0.9 0.08 72);
}

.admin-shell {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  min-height: calc(100svh - var(--header-height));
  background: var(--color-surface);
}

.admin-nav {
  position: sticky;
  top: var(--header-height);
  align-self: start;
  display: grid;
  gap: 4px;
  min-height: calc(100svh - var(--header-height));
  padding: 18px;
  border-right: 1px solid var(--color-line);
  background: var(--color-bg);
}

.admin-main {
  min-width: 0;
  padding: clamp(24px, 4vw, 48px);
}

.inline-review {
  grid-template-columns: minmax(120px, 0.8fr) minmax(150px, 1fr) auto;
  align-items: center;
}

.student-row {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(300px, 1fr);
  gap: 18px;
}

.slot-card {
  display: grid;
  gap: 6px;
}

.flash {
  padding: 12px 14px;
  border-radius: var(--radius);
  font-weight: 700;
}

.flash-success {
  color: oklch(0.22 0.08 132);
  background: oklch(0.94 0.04 132);
}

.flash-error {
  color: oklch(0.28 0.12 28);
  background: oklch(0.94 0.04 28);
}

.empty-state,
.prose {
  max-width: 760px;
}

.empty-state {
  display: grid;
  gap: 12px;
  padding: clamp(40px, 8vw, 88px) clamp(18px, 5vw, 72px);
}

@media (max-width: 900px) {
  .hero,
  .split-section,
  .admin-shell,
  .student-row {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero h1 {
    font-size: 44px;
  }

  .admin-nav {
    position: static;
    min-height: 0;
    display: flex;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--color-line);
  }
}

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 12px;
    right: 12px;
    top: calc(100% - 8px);
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    background: var(--color-bg);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav > a,
  .site-nav form,
  .site-nav button,
  .language-switcher {
    width: 100%;
  }

  .form-grid,
  .inline-review,
  .segmented-field {
    grid-template-columns: 1fr;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-visual {
    min-height: 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
  }
}