/* ============================================
   Design tokens
   ============================================ */
:root {
  --moss: #1f7a3f;
  --moss-dark: #0f2b1c;
  --ochre: #7ed957;
  --paper: #f4f9f6;
  --paper-dim: #e7f0ea;
  --ink: #14201a;
  --ink-rgb: 20, 32, 26;
  --stain: #b5423a;
  --stain-dark: #8f342d;
  --line: rgba(20, 32, 26, 0.14);
  --input-bg: #ffffff;
  --moss-rgb: 31, 122, 63;
  --stain-rgb: 181, 66, 58;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Source Sans 3', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --radius: 4px;
}

/* ============================================
   Dark mode — same tokens, new values. Every rule in this file already
   uses these variables, so the whole site re-themes from this block alone.
   ============================================ */
[data-theme="dark"] {
  --moss: #4fd07a;
  --moss-dark: #8fe6a8;
  --ochre: #a8e878;
  --paper: #0e1712;
  --paper-dim: #16211a;
  --ink: #eef3f0;
  --ink-rgb: 238, 243, 240;
  --stain: #e07068;
  --stain-dark: #f0968f;
  --line: rgba(238, 243, 240, 0.32);
  --input-bg: #16211a;
  --moss-rgb: 79, 208, 122;
  --stain-rgb: 224, 112, 104;
}

body, .specimen-card, .stat-card, .data-table, .auth-card, header.site,
footer.site, .diagram-frame, .upload-form, .material-row, .empty-state {
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* Subtle paper texture via layered gradients */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(var(--ink-rgb),0.02) 0, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(var(--ink-rgb),0.02) 0, transparent 40%);
}

a { color: inherit; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0 0 0.4em;
  color: var(--moss-dark);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--moss);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}
.eyebrow::before {
  content: '';
  width: 18px;
  height: 1px;
  background: var(--moss);
  display: inline-block;
}

/* ============================================
   Layout shell
   ============================================ */
.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

header.site {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.brand .mark {
  width: 34px;
  height: 34px;
  flex: none;
  object-fit: contain;
  border-radius: 6px;
}

nav.main {
  display: flex;
  gap: 28px;
  align-items: center;
  font-size: 0.92rem;
}
nav.main a {
  text-decoration: none;
  color: var(--ink);
  opacity: 0.75;
  transition: opacity 0.15s;
}
nav.main a:hover { opacity: 1; }

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 11px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.12s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--moss);
  color: #ffffff;
}
.btn-primary:hover { background: var(--moss-dark); }

.btn-ghost {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}
.btn-ghost:hover { background: rgba(var(--ink-rgb),0.06); }

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

/* ============================================
   Hero — the signature annotated-diagram section
   ============================================ */
.hero {
  padding: 76px 0 64px;
  position: relative;
}
.hero .grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  line-height: 1.05;
  margin: 0.35em 0 0.5em;
}
.hero .lede {
  font-size: 1.08rem;
  max-width: 46ch;
  color: rgba(var(--ink-rgb),0.78);
  margin-bottom: 2em;
}
.hero .cta-row { display: flex; gap: 14px; }

.specimen-diagram {
  position: relative;
}
.specimen-diagram svg { width: 100%; height: auto; }
.diagram-frame {
  background: var(--paper-dim);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 28px;
}
.diagram-caption {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: rgba(var(--ink-rgb),0.55);
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
}

/* ============================================
   Section scaffolding
   ============================================ */
section { padding: 64px 0; }
section.alt { background: var(--paper-dim); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 34px;
  flex-wrap: wrap;
  gap: 12px;
}
.section-head h2 { font-size: 1.9rem; margin: 0.3em 0 0; }

/* ============================================
   Specimen cards (lesson cards)
   ============================================ */
.specimen-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.specimen-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.specimen-card:hover {
  border-color: var(--moss);
  transform: translateY(-2px);
}
.specimen-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--moss);
  color: var(--paper);
  padding: 7px 14px;
  display: flex;
  justify-content: space-between;
}
.specimen-body { padding: 18px; flex: 1; display: flex; flex-direction: column; }
.specimen-body h3 { font-size: 1.12rem; margin-bottom: 0.35em; }
.specimen-body p { font-size: 0.88rem; color: rgba(var(--ink-rgb),0.68); margin: 0 0 auto; }
.specimen-meta {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  display: flex;
  justify-content: space-between;
  color: rgba(var(--ink-rgb),0.55);
}
.status-locked { color: var(--stain); }
.status-ready { color: var(--moss); }

/* ============================================
   Auth forms
   ============================================ */
.auth-shell {
  min-height: calc(100vh - 72px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
}
.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 36px 32px;
}
.auth-card h1 { font-size: 1.6rem; margin-bottom: 0.2em; }
.auth-card .sub { color: rgba(var(--ink-rgb),0.65); font-size: 0.92rem; margin-bottom: 1.8em; }

.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 7px;
  color: rgba(var(--ink-rgb),0.65);
}
.field input {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--input-bg);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--ink);
}
.field input:focus {
  outline: 2px solid var(--moss);
  outline-offset: 1px;
  border-color: var(--moss);
}

.form-msg {
  font-size: 0.86rem;
  padding: 10px 12px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  display: none;
}
.form-msg.show { display: block; }
.form-msg.error { background: rgba(var(--stain-rgb),0.1); color: var(--stain-dark); }
.form-msg.success { background: rgba(var(--moss-rgb),0.1); color: var(--moss-dark); }

.auth-switch { margin-top: 20px; font-size: 0.88rem; text-align: center; color: rgba(var(--ink-rgb),0.65); }
.auth-switch a { color: var(--moss); font-weight: 600; text-decoration: none; }

/* ============================================
   Video / lesson player page
   ============================================ */
.player-shell { padding: 32px 0 64px; }
.player-frame {
  background: #0a0a0a;
  border-radius: 6px;
  overflow: hidden;
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
}
.player-frame video { width: 100%; height: 100%; }
.player-frame .locked-msg {
  color: #f1f1f1;
  text-align: center;
  padding: 40px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* When our container (not just the <video>) goes fullscreen, it needs to
   actually fill the screen and keep the video correctly scaled inside —
   this is what keeps the watermark, which lives in this same container,
   visible and positioned correctly in fullscreen too. */
.player-frame:fullscreen,
.player-frame:-webkit-full-screen {
  width: 100vw;
  height: 100vh;
  border-radius: 0;
  aspect-ratio: unset;
}
.player-frame:fullscreen video,
.player-frame:-webkit-full-screen video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.player-fullscreen-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 34px;
  height: 34px;
  border-radius: 4px;
  border: none;
  background: rgba(0,0,0,0.55);
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
}
.player-fullscreen-btn:hover { background: rgba(0,0,0,0.75); }

.player-meta { margin-top: 22px; display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; flex-wrap: wrap; }
.player-meta h1 { font-size: 1.7rem; margin-bottom: 0.3em; }

/* ============================================
   Footer
   ============================================ */
footer.site {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: rgba(var(--ink-rgb),0.55);
  display: flex;
  justify-content: space-between;
}

/* ============================================
   Utility
   ============================================ */
.empty-state {
  padding: 48px 24px;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: 6px;
  color: rgba(var(--ink-rgb),0.6);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}

/* Responsive */
@media (max-width: 860px) {
  .hero .grid { grid-template-columns: 1fr; }
  nav.main { display: none; }
}

/* ============================================
   Smart Bio additions — stat cards, tables, badges, watermark
   ============================================ */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}
.stat-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
a.stat-card { cursor: pointer; color: inherit; }
a.stat-card:hover { border-color: var(--moss); transform: translateY(-2px); }
.stat-card .num {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--moss-dark);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-card .label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(var(--ink-rgb),0.6);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.data-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(var(--ink-rgb),0.6);
  background: var(--paper-dim);
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}
.data-table td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
}
.data-table tr:last-child td { border-bottom: none; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 20px;
}
.badge-public { background: rgba(var(--moss-rgb),0.12); color: var(--moss-dark); }
.badge-locked { background: rgba(var(--stain-rgb),0.12); color: var(--stain-dark); }
.badge-active { background: rgba(var(--moss-rgb),0.12); color: var(--moss-dark); }
.badge-expired, .badge-none { background: rgba(var(--stain-rgb),0.12); color: var(--stain-dark); }

/* Dark mode needs a stronger tint here — the same 0.12 opacity that reads
   fine as a soft pastel on a light background nearly disappears against
   a near-black one. Boosting opacity keeps the badge clearly visible
   and the text solidly legible. */
[data-theme="dark"] .badge-public,
[data-theme="dark"] .badge-active {
  background: rgba(var(--moss-rgb), 0.22);
}
[data-theme="dark"] .badge-locked,
[data-theme="dark"] .badge-expired,
[data-theme="dark"] .badge-none {
  background: rgba(var(--stain-rgb), 0.22);
}
.badge-cancelled { background: rgba(var(--ink-rgb),0.1); color: rgba(var(--ink-rgb),0.6); }

.search-input {
  width: 100%;
  max-width: 340px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.92rem;
  margin-bottom: 20px;
}

.action-btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 5px 10px;
  border-radius: 3px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  margin-right: 6px;
}
.action-btn:hover { border-color: var(--moss); }
.action-btn.danger:hover { border-color: var(--stain); color: var(--stain); }

/* Dark mode: a transparent button with only a border can still feel
   "invisible" even with a stronger border color — a faint fill gives it
   real presence as a clickable element, not just outlined text. */
[data-theme="dark"] .action-btn,
[data-theme="dark"] .btn-ghost,
[data-theme="dark"] .search-input,
[data-theme="dark"] select {
  background: var(--paper-dim);
}

.upload-form {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 24px;
  margin-bottom: 32px;
}
.upload-form .field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

/* Watermark overlay on the video player */
.watermark {
  position: absolute;
  padding: 6px 12px;
  background: rgba(var(--ink-rgb),0.35);
  color: rgba(255,255,255,0.65);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  border-radius: 3px;
  pointer-events: none;
  transition: top 1s ease, left 1s ease, right 1s ease, bottom 1s ease;
  user-select: none;
}
.player-frame { position: relative; }

/* ============================================
   Language tabs + materials list additions
   ============================================ */
.lang-tabs {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 3px;
  margin-bottom: 28px;
  background: var(--paper);
}
.lang-tab {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 7px 18px;
  border-radius: 16px;
  border: none;
  background: transparent;
  cursor: pointer;
  color: rgba(var(--ink-rgb),0.6);
}
.lang-tab.active {
  background: var(--moss);
  color: var(--paper);
}

.material-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 10px;
}
.material-row h3 { font-size: 1rem; margin: 0 0 4px; }
.material-row p { margin: 0; font-size: 0.85rem; color: rgba(var(--ink-rgb),0.65); }
.material-icon {
  width: 38px; height: 38px; flex: none;
  border-radius: 6px;
  background: var(--paper-dim);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 0.62rem; font-weight: 700;
  color: var(--moss-dark);
}

/* ============================================
   Global controls — theme + UI language toggle.
   Fixed markup in every page's header, wired up by theme-lang.js.
   ============================================ */
.global-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-inline-end: 10px;
  padding-inline-end: 10px;
  border-inline-end: 1px solid var(--line);
}
.control-btn {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--paper-dim);
  color: var(--ink);
  cursor: pointer;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.control-btn:hover { border-color: var(--moss); color: var(--moss-dark); }
.control-btn:focus-visible {
  outline: 2px solid var(--moss);
  outline-offset: 2px;
}
#theme-toggle { font-size: 0.9rem; padding: 7px 10px; }

@media (max-width: 860px) {
  .global-controls {
    margin-inline-end: 0;
    padding-inline-end: 0;
    border-inline-end: none;
  }
}

/* ============================================
   RTL support (Arabic UI). Most layout mirrors automatically via dir=rtl
   with flexbox — these are the few explicit adjustments needed.
   ============================================ */
html[dir="rtl"] body {
  font-family: 'Tahoma', 'Segoe UI', var(--font-body);
}
html[dir="rtl"] .eyebrow::before {
  order: 2;
}
html[dir="rtl"] .hero .lede,
html[dir="rtl"] .about-text {
  max-width: 46ch;
}
html[dir="rtl"] .cta-row,
html[dir="rtl"] nav.main,
html[dir="rtl"] .global-controls,
html[dir="rtl"] .lang-tabs {
  direction: rtl;
}
html[dir="rtl"] .specimen-tag,
html[dir="rtl"] .player-meta,
html[dir="rtl"] .section-head,
html[dir="rtl"] .material-row {
  direction: rtl;
}