/* Find the Pivot -- design tokens and the furniture every page shares.
 *
 * Every colour in the project is named here. A raw hex anywhere else is a bug:
 * the landing page and the decks have to stay visibly one product, and they
 * only do that if they are reading the same variables.
 */

:root {
  color-scheme: light dark;

  /* Surfaces and ink */
  --bg: #f2f6f9;
  --card: #ffffff;
  --card-2: #eaf1f6;
  --ink: #0f1d2e;
  --ink-soft: #475569;
  --ink-faint: #64748b;
  --line: #dbe4ec;

  /* Brand. --brand is the deep navy of the wordmark and section headings;
     --accent is the interactive teal that buttons and focus rings use. */
  --brand: #10344f;
  --accent: #0d5c70;
  --accent-soft: #0f7d96;
  --on-accent: #ffffff;
  --on-brand: #ffffff;

  /* The three answer states. These are the product's signature -- anything
     that means "decisive", "right line" or "not decisive" reuses them, and
     nothing invents a fourth colour. */
  --pivot-bg: #d5f2df;
  --pivot-ink: #1c4532;
  --pivot-line: #48a06f;

  --contrib-bg: #fdf0d5;
  --contrib-ink: #6b4907;
  --contrib-line: #d69e2e;

  --noise-bg: #fbdede;
  --noise-ink: #742a2a;
  --noise-line: #e07070;

  /* Shape */
  --radius: 12px;
  --radius-sm: 8px;
  --maxw: 1080px;
  --maxw-read: 660px;
  --shadow: 0 1px 3px rgba(15, 29, 46, 0.08);
  --shadow-lift: 0 10px 30px -12px rgba(15, 29, 46, 0.28);

  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  /* Arabic gets its own stack rather than falling through to a Latin face:
     the platform Naskh faces below carry proper joining and diacritic
     spacing, and a Latin fallback renders Arabic in whatever the browser
     can find, usually badly. Self-hosting a face would be better still, but
     the site ships no webfont on purpose -- it has to load on hospital
     wifi and work offline. */
  --font-ar: "SF Arabic", "Geeza Pro", "Noto Naskh Arabic", "Segoe UI",
             Tahoma, "Traditional Arabic", "Arial", sans-serif;
  /* A serif for the wordmark and headings: it reads as a reference text
     rather than a startup, and it costs no network request. */
  --font-display: ui-serif, Georgia, "Times New Roman", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1418;
    --card: #171d23;
    --card-2: #1e262d;
    --ink: #e8edf2;
    --ink-soft: #b3bec9;
    --ink-faint: #8b98a5;
    --line: #2d353d;

    --brand: #cfe3ef;
    --accent: #3fb6c9;
    --accent-soft: #7fd3e0;
    /* Dark ink on the lighter accent -- white on #3fb6c9 fails contrast. */
    --on-accent: #04222a;
    --on-brand: #0f1418;

    --pivot-bg: #17352a;
    --pivot-ink: #9ae6b4;
    --pivot-line: #3d9970;

    --contrib-bg: #3a2f14;
    --contrib-ink: #f0cb7a;
    --contrib-line: #b7862a;

    --noise-bg: #3d1f22;
    --noise-ink: #feb2b2;
    --noise-line: #a34f4f;

    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-lift: 0 10px 30px -12px rgba(0, 0, 0, 0.7);
  }
}

* { box-sizing: border-box; }

/* Arabic runs in the same layout, mirrored: the tokens, the brand bar, the
   buttons and the footer are all direction-agnostic above, so only the face
   and the line height change here. */
:root:lang(ar) {
  --font-ui: var(--font-ar);
  --font-display: var(--font-ar);
}
:lang(ar) body,
body:lang(ar) { line-height: 1.9; }

body {
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--ink);
  margin: 0;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

/* ---------- brand bar ---------- */

/* The same bar on the landing page and on every deck, so a learner who
   arrives on a deck link still knows what they are looking at and has one
   tap back to the rest of it. */
.bar {
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.bar-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 44px;
  text-decoration: none;
  color: var(--brand);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  /* The bar is the one place the name must never break across two lines,
     however many links sit beside it. */
  white-space: nowrap;
}

/* The company carries the mark; the product is what the reader came to use.
   Both belong in the bar, so the company leads in the display face and the
   product follows in a quieter weight after a separator. */
.wordmark-company { font-weight: 700; letter-spacing: 0.01em; }
.wordmark-product {
  font-family: var(--font-ui);
  font-size: 0.86em;
  font-weight: 550;
  color: var(--ink-soft);
}
.wordmark-product::before {
  content: "·";
  margin-inline: 0 0.4rem;
  color: var(--ink-faint);
  font-weight: 400;
}
/* Only the narrowest phones lose the product name; at 360px and up the whole
   lockup and the language switch still fit on one line. Measured, not
   guessed -- see the bar checks in tools/smoke-test.mjs. */
/* On a phone the lockup shares a 360px bar with a nav link, so it steps down
   a size first and only drops the product name when even that will not fit.
   Both thresholds are measured against the widest bar in the site -- a deck
   page's -- not guessed. */
@media (max-width: 440px) {
  .wordmark { font-size: 0.95rem; }
  .wordmark-product { font-size: 0.82em; }
  .bar-inner { padding-inline: 0.75rem; }
}
@media (max-width: 359px) {
  .wordmark-product { display: none; }
}
.wordmark svg { display: block; flex: 0 0 auto; }
.wordmark:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.bar-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.bar-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.7rem;
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}
.bar-link:hover { background: color-mix(in srgb, var(--ink) 7%, transparent); color: var(--ink); }
.bar-link:focus-visible { outline: 3px solid var(--accent); outline-offset: 1px; }

/* On a phone the bar keeps the name and the language switch. The in-page
   anchors are pure convenience -- the sections they point at are a thumb
   away -- and dropping them is what keeps the wordmark on one line. */
@media (max-width: 620px) {
  .bar-link[href^="#"] { display: none; }
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.75rem 1.35rem;
  font: inherit;
  font-weight: 650;
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-soft); }

.btn-secondary {
  background: var(--card);
  color: var(--ink);
  border-color: var(--line);
}
.btn-secondary:hover { border-color: var(--ink-faint); }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--card);
  margin-top: 3rem;
}
.site-footer .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.75rem 1rem 2.25rem;
  font-size: 0.82rem;
  color: var(--ink-faint);
  display: grid;
  gap: 0.6rem;
}
.site-footer a { color: var(--ink-soft); }
.site-footer a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.site-footer .disclaimer { max-width: 60ch; }

/* Available to any page: hidden visually, still read aloud. */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

/* Skip link -- the deck pages put a lot of nav buttons before the stem. */
.skip {
  position: absolute;
  inset-inline-start: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--on-accent);
  padding: 0.75rem 1rem;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 10;
}
.skip:focus {
  inset-inline-start: 0;
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}