/**
 * assets/css/glossary.css
 * Course glossary view. Uses the app's main.css design tokens; everything is
 * prefixed `gl-`. A searchable, A-Z + category-filtered definition list.
 */

.gl-head { margin-block-end: var(--space-4); }
.gl-head__sub { margin: var(--space-2) 0 0; color: var(--text-secondary); font-size: var(--text-base); max-width: 70ch; line-height: 1.6; }
.gl-head__sub b { color: var(--text-primary); font-weight: var(--font-semibold); }

/* ---- sticky controls: search + category filter ---- */
.gl-controls {
  position: sticky; top: 0; z-index: 20;
  margin-block: var(--space-4);
  padding: var(--space-4) 0;
  background: linear-gradient(180deg, var(--bg-primary) 78%, transparent);
}
.gl-search { position: relative; margin-block-end: var(--space-4); }
.gl-search__icon { position: absolute; inset-inline-start: 14px; top: 50%; transform: translateY(-50%); color: var(--text-muted); pointer-events: none; font-size: var(--text-lg); }
.gl-search__input {
  width: 100%; box-sizing: border-box;
  padding: 12px 16px 12px 44px;
  background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg);
  color: var(--text-primary); font-family: var(--font-sans); font-size: var(--text-base);
  transition: border-color .2s, box-shadow .2s;
}
.gl-search__input::placeholder { color: var(--text-muted); }
.gl-search__input:focus { outline: none; border-color: var(--accent-green); box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent-green) 22%, transparent); }
.gl-search__clear { position: absolute; inset-inline-end: 10px; top: 50%; transform: translateY(-50%); width: 26px; height: 26px; border: 0; border-radius: var(--radius-full); background: var(--bg-elevated); color: var(--text-secondary); cursor: pointer; font-size: var(--text-sm); display: none; place-items: center; }
.gl-search__clear.is-shown { display: grid; }
.gl-search__clear:hover { color: var(--text-primary); }
html[dir="rtl"] .gl-search__input { padding: 12px 44px 12px 16px; }

.gl-filters { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.gl-filter {
  padding: 6px 13px; border-radius: var(--radius-full);
  border: 1px solid var(--border-color); background: var(--bg-card);
  color: var(--text-secondary); font-family: var(--font-sans); font-size: var(--text-sm); cursor: pointer;
  transition: border-color .2s, color .2s, background .2s;
}
.gl-filter:hover { border-color: var(--text-muted); color: var(--text-primary); }
.gl-filter.is-on { background: var(--accent-green); border-color: var(--accent-green); color: var(--text-inverse); font-weight: var(--font-semibold); }
.gl-filter__n { font-family: var(--font-mono); opacity: .7; font-size: var(--text-xs); margin-inline-start: 5px; }

/* ---- A-Z quick jump ---- */
.gl-az { display: flex; flex-wrap: wrap; gap: 4px; margin-block-end: var(--space-6); }
.gl-az__btn {
  min-width: 30px; height: 30px; padding: 0 4px;
  display: inline-grid; place-items: center;
  border: 1px solid var(--border-color); border-radius: var(--radius-md);
  background: var(--bg-card); color: var(--text-secondary);
  font-family: var(--font-mono); font-size: var(--text-sm); font-weight: var(--font-semibold);
  cursor: pointer; transition: border-color .15s, color .15s, background .15s;
}
.gl-az__btn:hover:not(:disabled) { border-color: var(--accent-blue); color: var(--accent-blue); }
.gl-az__btn:disabled { opacity: .3; cursor: default; }

/* ---- letter sections + terms ---- */
.gl-section { margin-block-end: var(--space-6); scroll-margin-top: 140px; }
.gl-letter {
  font-family: var(--font-display); font-size: var(--text-2xl); color: var(--accent-green);
  margin: 0 0 var(--space-2); padding-block-end: 6px;
  border-block-end: 1px solid var(--border-color);
}
.gl-list { margin: 0; display: grid; gap: 2px; }
.gl-term {
  display: grid; grid-template-columns: minmax(190px, 0.9fr) 2fr; gap: var(--space-4) var(--space-6);
  padding: var(--space-4) var(--space-2); border-radius: var(--radius-md);
  border-block-end: 1px solid color-mix(in oklab, var(--border-color) 45%, transparent);
  transition: background .2s;
}
.gl-term:hover { background: color-mix(in oklab, var(--bg-card) 55%, transparent); }
.gl-term:target { background: color-mix(in oklab, var(--accent-green) 8%, transparent); }
@media (max-width: 680px) { .gl-term { grid-template-columns: 1fr; gap: var(--space-2); } }

.gl-term__head { display: flex; flex-direction: column; gap: 7px; align-items: flex-start; }
.gl-term__name { font-family: var(--font-display); font-size: var(--text-lg); font-weight: var(--font-bold); color: var(--text-primary); line-height: 1.2; }
.gl-term__name mark { background: color-mix(in oklab, var(--accent-yellow) 35%, transparent); color: var(--text-primary); border-radius: 3px; padding: 0 2px; }
.gl-cat {
  --gl-c: var(--accent-green);
  font-size: var(--text-xs); font-weight: var(--font-semibold);
  padding: 2px 9px; border-radius: var(--radius-full);
  border: 1px solid color-mix(in oklab, var(--gl-c) 55%, var(--border-color));
  background: color-mix(in oklab, var(--gl-c) 12%, transparent);
  color: var(--gl-c);
}
.gl-cat--fundamentals { --gl-c: var(--accent-green); }
.gl-cat--crypto       { --gl-c: var(--accent-blue); }
.gl-cat--consensus    { --gl-c: var(--accent-purple); }
.gl-cat--bitcoin      { --gl-c: var(--accent-yellow); }
.gl-cat--ethereum     { --gl-c: var(--accent-coral); }
.gl-cat--scaling      { --gl-c: var(--accent-blue); }
.gl-cat--enterprise   { --gl-c: var(--accent-purple); }
.gl-cat--economics    { --gl-c: var(--accent-red); }

.gl-term__body { min-width: 0; }
.gl-def { margin: 0; color: var(--text-secondary); font-size: var(--text-base); line-height: 1.65; max-width: 72ch; text-wrap: pretty; }
.gl-see { margin-block-start: 10px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: var(--text-sm); }
.gl-see__label { color: var(--text-muted); }
.gl-see__link {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px; border-radius: var(--radius-full);
  border: 1px solid color-mix(in oklab, var(--accent-blue) 40%, var(--border-color));
  color: var(--accent-blue); text-decoration: none; font-size: var(--text-sm);
  transition: background .2s, border-color .2s;
}
.gl-see__link:hover { background: color-mix(in oklab, var(--accent-blue) 14%, transparent); }
.gl-see__link::after { content: "↗"; font-size: var(--text-xs); opacity: .7; }

/* reveal on scroll: visible by default, animation only enhances */
.gl-term { animation: gl-in .4s var(--ease-out, cubic-bezier(.16,1,.3,1)) both; }
@keyframes gl-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* empty state */
.gl-empty { padding: var(--space-6); text-align: center; color: var(--text-muted); border: 1px dashed var(--border-color); border-radius: var(--radius-lg); }
.gl-empty b { color: var(--text-secondary); }

/* English headwords keep left-to-right order even on the Arabic (RTL) page */
html[dir="rtl"] .gl-term__name,
html[dir="rtl"] .gl-az { direction: ltr; }

@media (prefers-reduced-motion: reduce) {
  .gl-term { animation: none; }
  .gl-section { scroll-margin-top: 0; }
}