/* ============================================================
   E-turo — shared design system
   MATATAG-aligned classroom artifacts
   Self-contained: no CDN, no webfonts, works fully offline.
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Brand — Philippine flag palette, desaturated for long screen reading */
  --etu-blue-900: #062b57;
  --etu-blue-700: #0b4f9e;
  --etu-blue-500: #1f6fd0;
  --etu-blue-100: #e3edfb;
  --etu-blue-50:  #f2f7fe;

  --etu-sun-700: #a86400;
  --etu-sun-500: #f0a500;
  --etu-sun-300: #ffc94a;
  --etu-sun-100: #fff3d4;

  --etu-red-700: #a4161a;
  --etu-red-500: #d92d20;
  --etu-red-100: #fde7e6;

  --etu-green-700: #10693f;
  --etu-green-500: #16a34a;
  --etu-green-100: #dcfce7;

  /* Neutrals — warm, easier on the eye than pure grey */
  --etu-ink:      #14181f;
  --etu-ink-soft: #47505f;
  --etu-ink-mute: #6b7484;
  --etu-line:     #dfe3ea;
  --etu-line-soft:#eef1f6;
  --etu-surface:  #ffffff;
  --etu-canvas:   #f7f8fb;

  /* Semantic */
  --etu-accent:   var(--etu-blue-700);
  --etu-accent-fg:#ffffff;

  /* Type scale */
  --etu-font: "Segoe UI", Roboto, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --etu-mono: "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", monospace;

  --etu-radius: 12px;
  --etu-radius-lg: 18px;
  --etu-shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);
  --etu-shadow-lg: 0 2px 4px rgba(16, 24, 40, .06), 0 18px 44px rgba(16, 24, 40, .12);

  --etu-maxw: 76rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --etu-ink:      #eef1f6;
    --etu-ink-soft: #b9c1cf;
    --etu-ink-mute: #8b95a6;
    --etu-line:     #2a3140;
    --etu-line-soft:#212836;
    --etu-surface:  #161b25;
    --etu-canvas:   #0e121a;

    --etu-blue-100: #16294a;
    --etu-blue-50:  #111d33;
    --etu-sun-100:  #3a2c05;
    --etu-green-100:#0d2e1e;
    --etu-red-100:  #3a1413;
    --etu-accent:   var(--etu-blue-500);
  }
}
:root[data-theme="dark"] {
  --etu-ink:      #eef1f6;
  --etu-ink-soft: #b9c1cf;
  --etu-ink-mute: #8b95a6;
  --etu-line:     #2a3140;
  --etu-line-soft:#212836;
  --etu-surface:  #161b25;
  --etu-canvas:   #0e121a;
  --etu-blue-100: #16294a;
  --etu-blue-50:  #111d33;
  --etu-sun-100:  #3a2c05;
  --etu-green-100:#0d2e1e;
  --etu-red-100:  #3a1413;
  --etu-accent:   var(--etu-blue-500);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--etu-font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--etu-ink);
  background: var(--etu-canvas);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .5em; font-weight: 700; letter-spacing: -.011em; }
h1 { font-size: clamp(1.9rem, 1.3rem + 2.2vw, 2.9rem); }
h2 { font-size: clamp(1.35rem, 1.1rem + 1.1vw, 1.8rem); }
h3 { font-size: 1.15rem; }
p  { margin: 0 0 1em; }

a { color: var(--etu-accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

code, kbd { font-family: var(--etu-mono); font-size: .9em; }
code {
  background: var(--etu-blue-50);
  border: 1px solid var(--etu-line-soft);
  padding: .1em .35em;
  border-radius: 6px;
}
kbd {
  background: var(--etu-surface);
  border: 1px solid var(--etu-line);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: .12em .45em;
  font-size: .85em;
  color: var(--etu-ink-soft);
}

:where(button, a, input, select, [tabindex]):focus-visible {
  outline: 3px solid var(--etu-sun-500);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ---------- Layout ---------- */
.etu-wrap { max-width: var(--etu-maxw); margin: 0 auto; padding: 0 1.25rem; }
.etu-narrow { max-width: 52rem; }

.etu-header {
  background: linear-gradient(135deg, var(--etu-blue-900), var(--etu-blue-700) 55%, var(--etu-blue-500));
  color: #fff;
  padding: 2.5rem 0 2.75rem;
}
.etu-header a { color: #cfe1fb; }
.etu-header h1 { color: #fff; margin-bottom: .25rem; }
.etu-header .etu-sub { color: #c5d9f5; font-size: 1.05rem; margin: 0; max-width: 46rem; }

.etu-brand {
  display: inline-flex; align-items: center; gap: .55rem;
  font-weight: 800; letter-spacing: -.02em; font-size: 1.05rem;
  color: #fff; text-decoration: none; margin-bottom: 1.25rem;
}
.etu-brand-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--etu-sun-500); color: var(--etu-blue-900);
  display: grid; place-items: center; font-size: .95rem; font-weight: 900;
}

main { padding: 2.25rem 0 4rem; }

/* ---------- Cards & grid ---------- */
.etu-grid { display: grid; gap: 1.1rem; }
.etu-grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(min(20rem, 100%), 1fr)); }
.etu-grid.cols-3 { grid-template-columns: repeat(auto-fit, minmax(min(16rem, 100%), 1fr)); }

.etu-card {
  background: var(--etu-surface);
  border: 1px solid var(--etu-line);
  border-radius: var(--etu-radius-lg);
  padding: 1.35rem 1.4rem;
  box-shadow: var(--etu-shadow);
}
a.etu-card {
  display: block; text-decoration: none; color: inherit;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
a.etu-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--etu-shadow-lg);
  border-color: var(--etu-blue-500);
}
.etu-card h3 { margin-bottom: .35rem; }
.etu-card p  { margin: 0; color: var(--etu-ink-soft); font-size: .95rem; }
.etu-card-icon {
  width: 40px; height: 40px; border-radius: 11px;
  display: grid; place-items: center; font-size: 1.25rem;
  background: var(--etu-blue-100); margin-bottom: .8rem;
}

/* ---------- Pills / badges ---------- */
.etu-pill {
  display: inline-flex; align-items: center; gap: .35rem;
  font-size: .78rem; font-weight: 700; letter-spacing: .02em;
  padding: .22rem .6rem; border-radius: 999px;
  background: var(--etu-blue-100); color: var(--etu-blue-700);
  border: 1px solid transparent;
}
.etu-pill.sun   { background: var(--etu-sun-100);   color: var(--etu-sun-700); }
.etu-pill.green { background: var(--etu-green-100); color: var(--etu-green-700); }
.etu-pill.red   { background: var(--etu-red-100);   color: var(--etu-red-700); }
.etu-pill.ghost { background: transparent; color: var(--etu-ink-mute); border-color: var(--etu-line); }
.etu-pillrow { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .9rem; }

/* ---------- Buttons ---------- */
.etu-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  font: inherit; font-weight: 650;
  padding: .62rem 1.15rem; min-height: 44px;
  border-radius: 10px; border: 1px solid transparent;
  background: var(--etu-accent); color: var(--etu-accent-fg);
  cursor: pointer; text-decoration: none;
  transition: filter .15s ease, transform .05s ease;
}
.etu-btn:hover { filter: brightness(1.08); }
.etu-btn:active { transform: translateY(1px); }
.etu-btn.secondary {
  background: var(--etu-surface); color: var(--etu-ink); border-color: var(--etu-line);
}
.etu-btn.ghost { background: transparent; color: var(--etu-accent); border-color: currentColor; }
.etu-btn[disabled] { opacity: .5; cursor: not-allowed; }

/* ---------- Tables ---------- */
.etu-tablewrap { overflow-x: auto; border: 1px solid var(--etu-line); border-radius: var(--etu-radius); background: var(--etu-surface); }
table.etu { border-collapse: collapse; width: 100%; font-size: .93rem; min-width: 34rem; }
table.etu th, table.etu td { text-align: left; padding: .7rem .85rem; border-bottom: 1px solid var(--etu-line-soft); vertical-align: top; }
table.etu thead th {
  background: var(--etu-blue-50); color: var(--etu-blue-700);
  font-size: .78rem; text-transform: uppercase; letter-spacing: .05em;
  position: sticky; top: 0;
}
table.etu tbody tr:last-child td { border-bottom: 0; }

/* ---------- Callouts ---------- */
.etu-note {
  border-left: 4px solid var(--etu-accent);
  background: var(--etu-blue-50);
  padding: .9rem 1.1rem; border-radius: 0 var(--etu-radius) var(--etu-radius) 0;
  margin: 1.25rem 0;
}
.etu-note.warn  { border-color: var(--etu-sun-500);  background: var(--etu-sun-100); }
.etu-note.good  { border-color: var(--etu-green-500);background: var(--etu-green-100); }
.etu-note strong:first-child { display: block; margin-bottom: .2rem; }

/* ---------- Language switcher ----------
   Shared, because both the generated document pages (tools/render-docs.mjs)
   and the hand-written grade index pages carry one.

   Plain links, never a script: the switcher has to work from a USB stick in
   a classroom with no network, and a page that navigates itself somewhere
   the teacher did not ask for is worse than one extra click. Each variant is
   a whole separate page in a single language — never one page holding two. */
.etu-langsw {
  display: flex; align-items: center; gap: .5rem; flex-wrap: wrap;
  font-size: .85rem; margin: 0 0 1.25rem;
}
.etu-langsw-k {
  font-size: .72rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase;
  color: var(--etu-ink-mute);
}
.etu-langsw a {
  text-decoration: none; color: var(--etu-ink-soft);
  border: 1px solid var(--etu-line); border-radius: 999px; padding: .3rem .8rem;
}
.etu-langsw a:hover { border-color: var(--etu-accent); color: var(--etu-accent); }
.etu-langsw a[aria-current="page"] {
  background: var(--etu-ink); border-color: var(--etu-ink); color: #fff; font-weight: 700;
}

/* ---------- Print ---------- */
@media print {
  :root { --etu-canvas: #fff; --etu-surface: #fff; }
  body { font-size: 11pt; }
  .etu-header { background: none !important; color: #000; padding: 0 0 1rem; border-bottom: 2px solid #000; }
  .etu-header h1, .etu-header .etu-sub, .etu-brand { color: #000 !important; }
  .no-print { display: none !important; }
  a.etu-card, .etu-card { box-shadow: none; break-inside: avoid; }
  table.etu thead th { position: static; }
  .etu-langsw { display: none !important; }
}