/* ==========================================================================
   base.css — shared design tokens + page chrome for teaching.ezznasr.dev.
   v3: rebuilt to match the new light/dark "portal" visual identity
   (Manrope + DM Mono + Cairo, blue accent, rounded panels, radial-gradient
   background, sticky header with a light/dark theme toggle, WhatsApp
   float). Synced to assets_templates/base.css by common.py's
   sync_site_assets(), same mechanism as the JS engines.

   v3.1: added "track" accent overrides (body.track-one, body.track-two,
   ...), mirroring the pattern already used in the baccalaureate group
   pages' style.css. A lesson page picks its accent by carrying one of
   these classes on <body> — set by the generator based on which group
   the lesson lives in (see common.py's TRACK_CLASS_BY_GROUP). No class
   at all falls back to the default blue below, same as track-two.

   Backwards-compat notes for anyone editing this later:
     - .frame used to be the tick-corner "engineering drawing" motif. It
       is now the shared rounded/shadowed panel look instead. quiz.js,
       assign.js and attachments.js still append <span class="tick-br">
       and <span class="tick-bl"> children into .frame — they are
       intentionally left unstyled here (zero-size, invisible), so the
       JS engines did not need to change.
     - --serif is kept as an alias for --sans so any page-specific CSS
       still written as font-family:var(--serif) keeps working without
       being hunted down one by one.
     - --maxw has a sensible default here; page <style> blocks may still
       override :root{--maxw:...} for pages that want a narrower or
       wider column (quiz/assignment ~720-760px, subject pages wider).
   ========================================================================== */

:root{
  color-scheme:light;
  --bg:#f4f7fb; --bg-soft:#e8eef7; --panel:#fff; --panel-soft:#eef4fb;
  --line:#d6e1ef; --line-strong:#b8c9df;
  --ink:#10233f; --ink-dim:#63738a;
  --accent:#2f6fed; --accent-strong:#2056bd; --accent-soft:#dce9ff;
  --sage:#397b75; --honey:#e5a94f;
  --status-shipped:#2f9e6f; --status-fail:#e2574c; --status-progress:#e5a94f; --status-active:#2f6fed;
  --footer:#e7eef7;
  --whatsapp:#25d366; --whatsapp-deep:#128c4a;
  --mono:'DM Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans:'Manrope', ui-sans-serif, system-ui, sans-serif;
  --arabic:'Cairo', var(--sans);
  --serif:var(--sans); /* alias — legacy page CSS referencing var(--serif) still resolves */
  --maxw:1160px;
  --shadow:0 16px 32px rgba(16,35,63,.09);
}
html[data-theme="dark"]{
  color-scheme:dark;
  --bg:#091a32; --bg-soft:#0d2340; --panel:#102744; --panel-soft:#132d4d;
  --line:#244260; --line-strong:#385979;
  --ink:#f5f8ff; --ink-dim:#aabbd0;
  --accent:#72a5ff; --accent-strong:#9fc2ff; --accent-soft:#1c3e6a;
  --sage:#82c9bd; --honey:#f0c36d;
  --status-shipped:#7cdba0; --status-fail:#ff8a75; --status-progress:#f0c36d; --status-active:#72a5ff;
  --footer:#07162a;
  --shadow:0 18px 40px rgba(4,17,38,.28);
}

/* ---- accent "tracks" — override just the accent trio per lesson group.
   Values mirror programming/baccalaureate's own style.css exactly, so a
   lesson page's accent matches its parent group's portal page. ---- */
body.track-one{ --accent:#e58a45; --accent-strong:#b86127; --accent-soft:#ffead8; } /* grade 1 — orange */
body.track-two{ --accent:#2f6fed; --accent-strong:#2056bd; --accent-soft:#dce9ff; } /* grade 2 — blue (= default) */
html[data-theme="dark"] body.track-one{ --accent:#ffb36f; --accent-strong:#ffc78e; --accent-soft:#5a3926; }
html[data-theme="dark"] body.track-two{ --accent:#72a5ff; --accent-strong:#9fc2ff; --accent-soft:#1c3e6a; }

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:radial-gradient(circle at 88% 0%, color-mix(in srgb, var(--accent-soft) 58%, transparent), transparent 30rem), var(--bg);
  color:var(--ink); font-family:var(--sans); font-size:16px; line-height:1.65;
  -webkit-font-smoothing:antialiased; transition:background .35s ease, color .35s ease; overflow-x:hidden;
}
body::before{
  content:""; position:fixed; inset:0; pointer-events:none; opacity:.2;
  background-image:linear-gradient(color-mix(in srgb, var(--accent) 7%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--accent) 7%, transparent) 1px, transparent 1px);
  background-size:56px 56px;
  mask-image:linear-gradient(180deg, black, transparent 65%);
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *, *::before, *::after{ animation-duration:.01ms!important; transition-duration:.01ms!important; scroll-behavior:auto!important; }
}
a{ color:var(--accent-strong); }
button{ font-family:inherit; }
a:focus-visible, button:focus-visible{ outline:3px solid var(--accent); outline-offset:4px; border-radius:8px; }
.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 32px; }
h1,h2,h3{ font-family:var(--sans); font-weight:800; letter-spacing:-0.03em; color:var(--ink); margin:0; }

/* ---- shared rounded/shadowed panel (was the tick-corner "frame") ---- */
.frame{ position:relative; border:1px solid var(--line); border-radius:14px; background:var(--panel); box-shadow:var(--shadow); }

/* ---- status stamps (lesson cards, attachments) ---- */
.stamp{ font:10px var(--mono); letter-spacing:.08em; text-transform:uppercase; padding:4px 7px; border:1px solid currentColor; border-radius:5px; white-space:nowrap; }
.stamp.demo{ color:var(--honey); }
.stamp.shipped, .stamp.ready{ color:var(--sage); }
.stamp.planned{ color:var(--ink-dim); }

/* ---- header / titlebar ---- */
header{
  position:sticky; top:0; z-index:20;
  background:color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter:blur(16px);
  border-bottom:1px solid color-mix(in srgb, var(--line) 82%, transparent);
  transition:background .35s ease, border-color .35s ease;
}
.titlebar{ display:flex; align-items:center; justify-content:space-between; padding:17px 0; gap:18px; max-width:var(--maxw); margin:0 auto; padding-left:32px; padding-right:32px; }
.titlebar .mark{ font:600 13px var(--mono); letter-spacing:.02em; color:var(--ink); display:flex; align-items:center; gap:10px; text-decoration:none; }
.titlebar .mark .dot{ width:10px; height:10px; border-radius:50%; background:var(--accent); box-shadow:0 0 0 5px var(--accent-soft); transition:transform .25s ease; flex:0 0 auto; }
.titlebar .mark:hover .dot{ transform:scale(1.18); }
.titlebar nav{ display:flex; align-items:center; gap:20px; font:11px var(--mono); letter-spacing:.08em; text-transform:uppercase; }
.titlebar nav a{ color:var(--ink-dim); text-decoration:none; transition:color .2s ease; }
.titlebar nav a:hover, .titlebar nav a.current{ color:var(--accent-strong); }
.titlebar nav a.back::before{ content:"\2190 "; }

/* ---- theme toggle ---- */
.theme-toggle{
  border:1px solid var(--line-strong); background:var(--panel); color:var(--ink);
  display:inline-flex; align-items:center; gap:8px; padding:9px 13px; border-radius:9px;
  font:500 11px var(--mono); cursor:pointer;
  transition:transform .2s ease, background .3s ease, border-color .2s ease, color .2s ease;
}
.theme-toggle:hover{ transform:translateY(-2px); border-color:var(--accent); color:var(--accent-strong); }
.theme-toggle:active{ transform:translateY(0); }
.theme-icon{ font-size:14px; line-height:1; }
.theme-label::after{ content:'Dark mode'; }
html[data-theme="dark"] .theme-label::after{ content:'Light mode'; }

/* ---- generic page head ---- */
.page-head{ padding:44px 0 8px; }
.page-head p.lede{ color:var(--ink-dim); font-size:15.5px; margin:10px 0 0; }

/* ---- footer ---- */
footer{ border-top:1px solid var(--line); padding:42px 0 34px; background:var(--footer); transition:background .35s ease, border-color .35s ease; }
.footer-note{ font-family:var(--mono); font-size:11px; color:var(--ink-dim); letter-spacing:.04em; text-align:center; }
.footer-grid{ display:grid; grid-template-columns:1fr auto; gap:26px; align-items:end; }
.footer-intro strong{ display:block; font-size:17px; letter-spacing:-.03em; margin-bottom:5px; }
.footer-intro p{ margin:0; color:var(--ink-dim); font-size:13px; }
.footer-links{ display:flex; gap:9px; flex-wrap:wrap; justify-content:flex-end; }
.footer-links a{ color:var(--ink); text-decoration:none; border:1px solid var(--line-strong); background:var(--panel); padding:10px 13px; border-radius:9px; font:500 11px var(--mono); transition:transform .2s ease, border-color .2s ease, color .2s ease; }
.footer-links a:hover{ transform:translateY(-3px); border-color:var(--accent); color:var(--accent-strong); }
.footer-bottom{ display:flex; justify-content:space-between; gap:18px; flex-wrap:wrap; margin-top:30px; padding-top:17px; border-top:1px solid var(--line); color:var(--ink-dim); font:10px var(--mono); }

/* ---- WhatsApp float ---- */
.whatsapp-float{
  position:fixed; right:24px; bottom:24px; z-index:30;
  display:inline-flex; align-items:center; gap:10px; padding:13px 17px; border-radius:999px;
  background:var(--whatsapp); color:#fff; text-decoration:none; font:700 12px var(--mono);
  box-shadow:0 12px 26px rgba(18,140,74,.28), 0 0 0 5px color-mix(in srgb, var(--whatsapp) 18%, transparent);
  transition:transform .24s ease, box-shadow .24s ease, background .24s ease;
}
.whatsapp-float:hover{ transform:translateY(-5px) scale(1.02); background:var(--whatsapp-deep); box-shadow:0 18px 34px rgba(18,140,74,.34); }
.whatsapp-icon{ display:grid; place-items:center; width:22px; height:22px; border-radius:50%; background:#fff; color:var(--whatsapp-deep); flex:0 0 22px; }
.whatsapp-icon svg{ width:15px; height:15px; fill:currentColor; }

/* ---- media-slot (video embed box, shared by index/assignment/quiz) ---- */
.media-slot{ width:100%; aspect-ratio:16/9; border:1px dashed var(--line-strong); border-radius:14px; margin:28px 0; position:relative;
  background:repeating-linear-gradient(45deg, transparent, transparent 10px, color-mix(in srgb, var(--accent) 6%, transparent) 10px, color-mix(in srgb, var(--accent) 6%, transparent) 20px), var(--panel-soft);
  display:flex; align-items:center; justify-content:center; font-family:var(--mono); font-size:11.5px; color:var(--ink-dim); text-align:center; padding:16px; overflow:hidden; }
.media-slot iframe{ width:100%; height:100%; border:0; }

/* ---- video-lock overlay: gates a media-slot video until the quiz/
   assignment on that same page has been submitted at least once ---- */
.media-slot.is-locked iframe{ filter:blur(10px); pointer-events:none; }
.video-lock{ position:absolute; inset:0; z-index:3; display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:8px; background:rgba(8,12,22,.78); -webkit-backdrop-filter:blur(6px); backdrop-filter:blur(6px);
  border-radius:14px; cursor:pointer; text-align:center; padding:20px; }
.video-lock__icon{ font-size:26px; line-height:1; filter:drop-shadow(0 1px 2px rgba(0,0,0,.4)); }
.video-lock__msg{ font-family:var(--mono); font-size:11.5px; color:#e8ecf6; max-width:280px;
  opacity:0; max-height:0; overflow:hidden; transition:opacity .2s ease, max-height .2s ease; }
.video-lock.is-tapped .video-lock__msg{ opacity:1; max-height:60px; margin-top:2px; }
.video-lock.shake{ animation:video-lock-shake .3s ease; }
@keyframes video-lock-shake{ 0%,100%{ transform:translateX(0); } 20%{ transform:translateX(-4px); }
  40%{ transform:translateX(4px); } 60%{ transform:translateX(-3px); } 80%{ transform:translateX(3px); } }

@media (max-width:800px){
  .wrap{ padding:0 20px; }
  .titlebar{ padding:15px 0; padding-left:20px; padding-right:20px; }
  .titlebar .mark{ font-size:11px; }
  .titlebar nav{ gap:10px; }
  .theme-label{ display:none; }
  .footer-grid{ grid-template-columns:1fr; gap:24px; }
  .footer-links{ justify-content:flex-start; }
  .footer-bottom{ display:block; line-height:1.8; }
  .footer-bottom span{ display:block; }
  .whatsapp-float{ right:16px; bottom:max(16px, env(safe-area-inset-bottom)); padding:13px 16px; }
}

/* page-transition: cross-document view transitions for same-origin nav */
@view-transition{navigation:auto}
::view-transition-old(root){animation:180ms ease-out both vt-fade-out}
::view-transition-new(root){animation:220ms ease-out both vt-fade-in}
@keyframes vt-fade-out{to{opacity:0;transform:translateY(-6px)}}
@keyframes vt-fade-in{from{opacity:0;transform:translateY(6px)}}