/* settings.css — Phase 8.4 design-system port for /settings.
 * Sticky-rail + multi-section settings page. Visual layer only —
 * preserves every preference handler and rx.cond.
 */

.st-head {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 14px;
}
.st-head .ttl {
  margin: 0;
  font: var(--fw-bold) 26px/1.05 var(--font-display);
  letter-spacing: -0.015em;
  color: var(--fg-1);
}
.st-head .sub {
  font: var(--fw-regular) var(--fs-sm)/1.4 var(--font-body);
  color: var(--fg-3);
  max-width: 720px;
}

.st-grid {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}
@media (max-width: 900px) {
  .st-grid { grid-template-columns: 1fr; }
  .st-rail { position: static; }
}

.st-rail {
  position: sticky;
  top: 80px;
  background: color-mix(in srgb, var(--bg-card) 60%, transparent);
  border: 1px solid var(--border-1);
  border-radius: var(--r-lg);
  padding: 8px;
}
.st-rail-head {
  font: var(--fw-semi) 9px/1 var(--font-body);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--fg-4);
  padding: 8px 10px 6px;
}
.st-rail-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 5px;
  color: var(--fg-3);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 120ms ease, color 120ms ease;
}
.st-rail-link svg { width: 14px; height: 14px; flex-shrink: 0; color: var(--fg-4); }
.st-rail-link:hover { background: var(--bg-input); color: var(--fg-1); }
.st-rail-link:hover svg { color: var(--fg-2); }

.st-section {
  background: var(--bg-card);
  border: 1px solid var(--border-1);
  border-radius: var(--r-lg);
  padding: 20px 22px;
  scroll-margin-top: 80px;
}