:root {
  --site-bg: #071725;
  --site-surface: #0d263b;
  --site-surface-2: #123451;
  --site-border: #28506f;
  --site-text: #eef7fc;
  --site-muted: #9cb8cb;
  --site-primary: #58c8ea;
  --site-accent: #f6c85f;
  --site-success: #58d68d;
  --site-radius: 16px;
  --site-shadow: 0 18px 48px rgba(0, 0, 0, .22);
  color-scheme: dark;
}

html { -webkit-text-size-adjust: 100%; }
body { padding-bottom: max(72px, calc(56px + env(safe-area-inset-bottom))) !important; }
button, a, input, select, textarea { -webkit-tap-highlight-color: transparent; }
button, [role="button"], a { touch-action: manipulation; }

/* Existing course navigation is upgraded rather than duplicated. */
.nav.site-course-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  flex-wrap: nowrap !important;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
  padding-top: max(8px, env(safe-area-inset-top)) !important;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--site-bg) 90%, transparent) !important;
  border-bottom-color: var(--site-border) !important;
}
.nav.site-course-nav::-webkit-scrollbar { display: none; }
.nav.site-course-nav a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}
.nav.site-course-nav .home { position: sticky; left: 0; z-index: 2; background: var(--site-bg); }

.site-bottom-nav {
  position: fixed;
  left: 50%;
  bottom: max(10px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 80;
  width: min(420px, calc(100vw - 24px));
  display: none;
  grid-template-columns: 1fr 1.2fr 1fr;
  gap: 6px;
  padding: 7px;
  border: 1px solid var(--site-border);
  border-radius: 18px;
  background: rgba(7, 23, 37, .94);
  box-shadow: var(--site-shadow);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.site-bottom-nav a {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 6px 8px;
  border-radius: 12px;
  color: var(--site-muted);
  text-decoration: none;
  font-size: 12px;
  font-weight: 650;
}
.site-bottom-nav a.current { color: var(--site-primary); background: var(--site-surface-2); }
.site-bottom-nav a.disabled { opacity: .35; pointer-events: none; }

.site-fab-home {
  position: fixed;
  right: 16px;
  bottom: max(76px, calc(64px + env(safe-area-inset-bottom)));
  z-index: 90;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 14px;
  border: 1px solid var(--site-border);
  border-radius: 999px;
  color: var(--site-text);
  background: rgba(7, 23, 37, .94);
  box-shadow: var(--site-shadow);
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  backdrop-filter: blur(16px);
}

.site-offline-note {
  position: fixed;
  left: 50%;
  top: 12px;
  transform: translateX(-50%);
  z-index: 120;
  display: none;
  padding: 8px 14px;
  border-radius: 999px;
  background: #6d3b22;
  color: #fff4e6;
  font-size: 12px;
  box-shadow: var(--site-shadow);
}
body.site-offline .site-offline-note { display: block; }

@media (max-width: 720px) {
  body.site-course-page { padding-bottom: max(88px, calc(72px + env(safe-area-inset-bottom))) !important; }
  .site-bottom-nav { display: grid; }
  .nav.site-course-nav { display: none !important; }
  body.site-course-page > header { padding: 18px 16px 6px !important; }
  body.site-course-page > main { padding-left: 16px !important; padding-right: 16px !important; }
  body.site-course-page .grid { grid-template-columns: minmax(0, 1fr) !important; }
  body.site-course-page .card,
  body.site-course-page .pos,
  body.site-course-page .rulecard,
  body.site-course-page .conv,
  body.site-course-page .cmp { border-radius: 14px !important; }
  body.site-course-page .modal {
    width: 100% !important;
    max-height: 88dvh !important;
    border-radius: 22px 22px 0 0 !important;
    margin-top: auto;
    padding-bottom: calc(20px + env(safe-area-inset-bottom)) !important;
  }
  body.site-course-page .mask { align-items: flex-end !important; padding: 0 !important; }
  body.site-course-page button,
  body.site-course-page .btn,
  body.site-course-page .playbig { min-height: 44px; }
  body.site-course-page .tabs { flex-wrap: nowrap !important; overflow-x: auto; scrollbar-width: none; }
  body.site-course-page .tabs::-webkit-scrollbar { display: none; }
  body.site-course-page .tabs button { flex: 0 0 auto; }
  .site-fab-home { right: 12px; bottom: max(76px, calc(64px + env(safe-area-inset-bottom))); width: 44px; padding: 0; justify-content: center; }
  .site-fab-home span { display: none; }
}

@media (min-width: 721px) {
  .site-course-page .site-bottom-nav { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}

/* Intensive Reading is a desktop split view; phones use one continuous document. */
@media (max-width: 600px) {
  html.site-intensive,
  html.site-intensive body { height: auto !important; min-height: 100%; overflow: auto !important; }
  body.site-intensive #app { height: auto !important; min-height: 100dvh; display: block !important; }
  body.site-intensive .top { display: block !important; padding: 10px 12px !important; }
  body.site-intensive .brand { display: grid !important; grid-template-columns:auto minmax(0,1fr); gap: 3px 8px !important; }
  body.site-intensive .brand b { white-space: nowrap; }
  body.site-intensive .brand .sub { max-width: none !important; min-width: 0; }
  body.site-intensive .brand .meta { grid-column: 1 / -1; }
  body.site-intensive .tools { display: grid !important; grid-template-columns:repeat(4,minmax(0,1fr)); gap: 6px !important; margin: 9px 0 0 !important; }
  body.site-intensive .tools button { padding: 7px 5px !important; font-size: 11.5px !important; }
  body.site-intensive .layers { flex-wrap: nowrap !important; overflow-x: auto; padding: 7px 12px !important; scrollbar-width: none; }
  body.site-intensive .layers::-webkit-scrollbar { display: none; }
  body.site-intensive .layers > * { flex: 0 0 auto; }
  body.site-intensive main { display: block !important; min-height: auto !important; }
  body.site-intensive .reader { overflow: visible !important; padding: 14px 16px 24px !important; font-size: 16px !important; }
  body.site-intensive .zh { font-size: 14px !important; }
  body.site-intensive .chapter-video video { max-height: 54vw !important; }
  body.site-intensive .side { min-height: auto !important; border-left: 0 !important; border-top: 1px solid var(--site-border) !important; }
  body.site-intensive .tabbody { overflow: visible !important; padding-bottom: 24px !important; }
  body.site-intensive .status { position: static !important; padding: 8px 12px 82px !important; }
}

.site-legal-footer {
  max-width: 1100px;
  margin: 18px auto 0;
  padding: 18px 18px calc(72px + env(safe-area-inset-bottom));
  color: var(--site-muted);
  text-align: center;
}
.site-compliance {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-top: 10px;
  color: var(--site-muted);
  font-size: 12px;
  line-height: 1.7;
}
.site-compliance a {
  color: var(--site-muted);
  text-decoration: none;
}
.site-compliance a:hover { color: var(--site-primary); text-decoration: underline; }
.site-compliance .police::before { content: "◆"; margin-right: 5px; color: var(--site-primary); }