/* App shell — builds on tokens.css */

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

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

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.45;
  padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom, 0px));
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

/* Layout */
.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 52px;
  padding: 8px var(--space-pad);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.app-header__mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 6px;
  display: block;
}
.app-header__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.app-header__meta {
  margin: 0;
  font-size: 12px;
  color: var(--color-text-muted);
}

.main {
  padding: var(--space-pad);
  max-width: 480px;
  margin: 0 auto;
}

.bottom-nav {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 30;
  display: flex;
  height: var(--nav-h);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}
.bottom-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 600;
  text-decoration: none;
  min-height: var(--touch-min);
}
.bottom-nav a[aria-current="page"],
.bottom-nav a.is-active {
  color: var(--color-accent);
}

/* Chips (OfflineChip) */
.chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}
.chip--ok { background: #0B3D2E; color: var(--color-accent); }
html[data-theme="light"] .chip--ok { background: #E8F8EF; color: #0B7A3E; }
.chip--warn { background: #3D2E0B; color: var(--color-warning); }
html[data-theme="light"] .chip--warn { background: #FFF8E6; color: #8A6A00; }
.chip--need { background: #3D1518; color: var(--color-danger); }
.chip--sync { background: var(--color-surface-elevated); color: var(--color-text-muted); }

/* Skeleton */
.skel {
  background: var(--color-skeleton);
  border-radius: 6px;
  margin: 8px 0;
  animation: skel-pulse 1.2s ease-in-out infinite;
}
.skel--line { height: 14px; }
.skel--card { height: 72px; border-radius: var(--radius-card); }
.skel--quiz { height: 48px; margin-bottom: 8px; }
@keyframes skel-pulse { 50% { opacity: 0.45; } }
html[data-lite="1"] .skel,
@media (prefers-reduced-motion: reduce) {
  .skel { animation: none; }
}

/* Cards / lists */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 14px;
  margin-bottom: 12px;
  box-shadow: var(--shadow-card);
}
.card h2, .card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; color: var(--color-text-muted); font-size: 14px; }

.list-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: var(--touch-min);
  padding: 12px 14px;
  margin-bottom: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
}
.list-link:hover { text-decoration: none; border-color: var(--color-primary); }
.list-link__meta { font-size: 12px; font-weight: 500; color: var(--color-text-muted); }

.strip {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 12px 14px;
  margin-bottom: 16px;
}
.strip p { margin: 0 0 6px; font-size: 14px; }
.strip p:last-child { margin-bottom: 0; }

.hero-city {
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--touch-min);
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  border: none;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  width: 100%;
  transition: background var(--motion-max), opacity var(--motion-max);
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:active { background: var(--color-primary-pressed); }
.btn-secondary {
  background: var(--color-surface-elevated);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-accent {
  background: var(--color-accent);
  color: #0A0A0A;
}
.btn-row { display: flex; flex-direction: column; gap: 8px; margin-top: 12px; }
.btn-row--h { flex-direction: row; }
.btn-row--h .btn { flex: 1; }

/* Forms */
label.field {
  display: block;
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
}
label.field input,
label.field select,
label.field textarea {
  display: block;
  width: 100%;
  margin-top: 6px;
  min-height: var(--touch-min);
  padding: 10px 12px;
  border-radius: 10px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 16px;
}
label.field input:focus,
label.field select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}
.hint { font-size: 13px; color: var(--color-text-muted); margin: 8px 0 0; }
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--nav-h) + 16px);
  transform: translateX(-50%);
  z-index: 50;
  max-width: 90vw;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  font-size: 14px;
  box-shadow: var(--shadow-card);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--motion-max);
}
.toast.is-show { opacity: 1; }

/* Quiz options */
.quiz-progress {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}
.quiz-stem {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 16px;
  line-height: 1.35;
}
.opt {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  width: 100%;
  margin: 0 0 8px;
  padding: 14px;
  min-height: var(--touch-min);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 16px;
  text-align: left;
  cursor: pointer;
}
.opt[aria-pressed="true"],
.opt.is-selected { border-color: var(--color-primary); }
.opt.is-correct { border-color: var(--color-accent); }
.opt.is-wrong { border-color: var(--color-danger); }
.opt__letter { font-weight: 700; min-width: 1.25em; }
.opt:disabled { cursor: default; opacity: 1; }

.quiz-topic {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}
.score-banner {
  text-align: center;
  padding: 24px 16px;
  background: var(--color-surface);
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border);
  margin-bottom: 16px;
}
.score-banner strong { font-size: 36px; color: var(--color-accent); display: block; }

/* Pricing */
.pricing .plan {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 16px;
  margin-bottom: 12px;
}
.plan--hero {
  border: 2px solid var(--color-primary);
  background: var(--color-surface-elevated);
}
.plan__badge {
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  margin: 0 0 4px;
}
.plan h2 { margin: 0 0 4px; font-size: 20px; }
.plan__price {
  margin: 8px 0;
  font-size: 22px;
  font-weight: 800;
}
.plan .meta { margin: 0 0 12px; font-size: 13px; color: var(--color-text-muted); }
.badge-premium {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--color-premium);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
}

/* Reference fact cards */
.fact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 14px;
  margin-bottom: 10px;
}
.fact-card__type {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary);
  margin: 0 0 4px;
}
.fact-card h3 { margin: 0 0 6px; font-size: 16px; }
.fact-card p { margin: 0; font-size: 14px; color: var(--color-text-muted); }
.fact-card__topic { font-size: 12px; color: var(--color-text-muted); margin-top: 8px; }

/* Settings */
.settings-group {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 14px;
  margin-bottom: 16px;
}
.settings-group h2 { margin: 0 0 12px; font-size: 15px; }
.settings-group label {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  font-size: 15px;
  cursor: pointer;
}
.settings-group input[type="radio"],
.settings-group input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--color-primary);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

.muted { color: var(--color-text-muted); }
.mt-0 { margin-top: 0; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.hidden { display: none !important; }

/* Form / Mix setup (quiz) */
.form-setup__lead {
  margin: 0 0 14px;
  font-size: 15px;
  color: var(--color-text-muted);
}
.form-choice {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}
.form-choice__btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  width: 100%;
  min-height: var(--touch-min);
  padding: 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 16px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}
.form-choice__btn span {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
}
.form-choice__btn[aria-pressed="true"],
.form-choice__btn.is-selected {
  border-color: var(--color-primary);
  box-shadow: inset 0 0 0 1px var(--color-primary);
}
.form-filter-note {
  font-size: 13px;
  color: var(--color-warning);
  margin: 0 0 12px;
  padding: 10px 12px;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
}