/* ==========================================================================
   亮不亮 · LiangBuLiang — Official Website
   Design system: Amber accent + Slate neutrals (matches the Android app)
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --accent: #F59E0B;            /* amber-500 */
  --accent-strong: #D97706;     /* amber-600 */
  --accent-soft: #FEF3C7;       /* amber-100 */
  --accent-glow: rgba(245, 158, 11, 0.35);
  --accent-contrast: #0F172A;   /* text on accent */

  --bg: #F8FAFC;
  --bg-alt: #F1F5F9;
  --surface: #FFFFFF;
  --surface-2: #F8FAFC;
  --text: #0F172A;
  --text-muted: #475569;
  --text-faint: #94A3B8;
  --border: #E2E8F0;
  --border-strong: #CBD5E1;

  --ring: rgba(245, 158, 11, 0.45);

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 14px -2px rgba(15, 23, 42, 0.08), 0 2px 6px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 45px -12px rgba(15, 23, 42, 0.18);
  --shadow-accent: 0 12px 32px -8px rgba(245, 158, 11, 0.45);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --container: 1140px;
  --header-h: 68px;

  /* App (phone mockup) theme — mirrors the Android app's Material scheme */
  --phone-primary: #F59E0B;
  --phone-bg: #F8FAFC;
  --phone-surface: #FFFFFF;
  --phone-onbg: #0F172A;
  --phone-track: rgba(15, 23, 42, 0.08);
  --phone-onbg-12: rgba(15, 23, 42, 0.12);
  --phone-onbg-35: rgba(15, 23, 42, 0.35);
  --phone-onbg-45: rgba(15, 23, 42, 0.45);
}

[data-theme="dark"] {
  --accent: #FBBF24;            /* amber-400, brighter on dark */
  --accent-strong: #F59E0B;
  --accent-soft: rgba(245, 158, 11, 0.14);
  --accent-glow: rgba(251, 191, 36, 0.30);
  --accent-contrast: #0F172A;

  --bg: #0F172A;
  --bg-alt: #1E293B;
  --surface: #1E293B;
  --surface-2: #16223A;
  --text: #F8FAFC;
  --text-muted: #94A3B8;
  --text-faint: #64748B;
  --border: #334155;
  --border-strong: #475569;

  --ring: rgba(251, 191, 36, 0.5);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px -2px rgba(0, 0, 0, 0.5), 0 2px 6px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 50px -12px rgba(0, 0, 0, 0.6);
  --shadow-accent: 0 12px 32px -8px rgba(251, 191, 36, 0.35);

  /* App (phone mockup) theme — mirrors the Android app's dark Material scheme */
  --phone-primary: #0D9488;
  --phone-bg: #0F172A;
  --phone-surface: #1E293B;
  --phone-onbg: #F8FAFC;
  --phone-track: rgba(248, 250, 252, 0.08);
  --phone-onbg-12: rgba(248, 250, 252, 0.12);
  --phone-onbg-35: rgba(248, 250, 252, 0.35);
  --phone-onbg-45: rgba(248, 250, 252, 0.45);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.25s ease, color 0.25s ease;
}

img, svg { display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

h1, h2, h3, h4 { line-height: 1.2; margin: 0; font-weight: 700; letter-spacing: -0.01em; overflow-wrap: break-word; }
p { margin: 0; overflow-wrap: break-word; }
ul, ol { margin: 0; padding: 0; list-style: none; }
code, pre { font-family: var(--font-mono); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.container-narrow { max-width: 820px; }

.section { padding: 96px 0; }
.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-head {
  max-width: 640px;
  margin: 0 auto 56px;
  text-align: center;
}
.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-strong);
  background: var(--accent-soft);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.section-title { font-size: clamp(1.75rem, 3.2vw, 2.5rem); }
.section-sub {
  margin-top: 16px;
  font-size: 1.075rem;
  color: var(--text-muted);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  border-radius: 12px;
  border: 1px solid transparent;
  padding: 12px 22px;
  font-size: 0.95rem;
  transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease,
    border-color 0.16s ease, color 0.16s ease;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn:active { transform: translateY(1px); }
.btn-lg { padding: 15px 28px; font-size: 1rem; border-radius: 14px; }
.btn-sm { padding: 9px 16px; font-size: 0.875rem; border-radius: 10px; }

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow: var(--shadow-accent);
}
.btn-primary:hover { background: var(--accent-strong); transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-strong); transform: translateY(-1px); }

.btn-github {
  background: #24292F;
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow: 0 12px 32px -8px rgba(36, 41, 47, 0.45);
}
.btn-github:hover { background: #161B22; border-color: rgba(255, 255, 255, 0.42); transform: translateY(-1px); }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  transition: color 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}
.icon-btn:hover { color: var(--accent-strong); border-color: var(--border-strong); }
.icon-btn svg { width: 20px; height: 20px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #FBBF24, #D97706);
  color: #0F172A;
  box-shadow: var(--shadow-accent);
}
.brand-mark svg { width: 22px; height: 22px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-weight: 800; font-size: 1.05rem; letter-spacing: 0.01em; }
.brand-sub {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav { display: flex; gap: 6px; }
.site-nav a {
  padding: 8px 14px;
  border-radius: 9px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.16s ease, background 0.16s ease;
}
.site-nav a:hover { color: var(--text); background: var(--bg-alt); }

.header-actions { display: flex; align-items: center; gap: 10px; }

.lang-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--surface);
}
.lang-btn {
  border: none;
  background: transparent;
  color: var(--text-muted);
  padding: 8px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 0.16s ease, color 0.16s ease;
}
.lang-btn.is-active { background: var(--accent); color: var(--accent-contrast); }

.nav-toggle { display: none; }

/* theme icon swap */
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 96px 0 88px;
}
.hero-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(48% 40% at 78% 20%, var(--accent-glow), transparent 70%),
    radial-gradient(40% 36% at 18% 80%, rgba(251, 191, 36, 0.10), transparent 70%);
  filter: blur(10px);
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 7px 14px;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}
.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22C55E;
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.18);
}

.hero-title {
  margin-top: 24px;
  font-size: clamp(3rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(120deg, var(--text) 20%, var(--accent-strong) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-tagline {
  margin-top: 18px;
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  font-weight: 600;
}
.hero-desc {
  margin-top: 12px;
  font-size: 1.075rem;
  color: var(--text-muted);
  max-width: 480px;
}
.hero-ctas { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 14px; }

.hero-stats {
  margin-top: 44px;
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
}
.hero-stats li { display: flex; flex-direction: column; gap: 4px; }
.stat-value { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.02em; }
.stat-label { font-size: 0.82rem; color: var(--text-muted); }

/* ---------- Hero visual / app card ---------- */
.hero-visual { display: flex; justify-content: center; align-items: center; }

.app-card {
  position: relative;
  padding: 40px;
  border-radius: var(--radius-xl);
  background: color-mix(in srgb, var(--surface) 72%, transparent);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.app-icon {
  width: 176px;
  height: 176px;
  border-radius: 40px;
  box-shadow: var(--shadow-accent);
}
.float-chip {
  position: absolute;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  box-shadow: var(--shadow-md);
  animation: float 5s ease-in-out infinite;
}
.float-chip--tl { top: 6px; left: -20px; }
.float-chip--br { bottom: 6px; right: -20px; animation-delay: 2.5s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
/* ---------- Phone demo (1:1 app replica) ---------- */
.phone-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}
.phone {
  width: 340px;
  max-width: 100%;
  border-radius: 48px;
  background: #0a0a0f;
  padding: 12px;
  box-shadow: var(--shadow-lg), inset 0 0 0 2px rgba(255, 255, 255, 0.06);
}
.phone-screen {
  position: relative;
  height: 620px;
  border-radius: 38px;
  overflow: hidden;
}
.app {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 34px 18px 14px;
  background: var(--phone-bg);
  transition: filter 0.15s ease, background 0.25s ease;
}
.app-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.app-title {
  text-align: center;
  font-size: 34px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--phone-onbg);
  margin: 0 0 28px;
}
.app-card {
  background: var(--phone-surface);
  border-radius: 20px;
  padding: 16px;
  margin-bottom: 14px;
}
.app-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
}
.app-head-icon {
  width: 22px;
  height: 22px;
  flex: none;
  color: var(--phone-primary);
}
.app-card-label {
  flex: 1;
  font-weight: 600;
  font-size: 15px;
  color: var(--phone-onbg);
}
.app-value {
  font-weight: 700;
  font-size: 13px;
  color: var(--phone-primary);
  margin-right: 8px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.app-value.is-off { color: var(--phone-onbg-35); }

/* switch */
.switch {
  position: relative;
  flex: none;
  width: 44px;
  height: 24px;
  border: none;
  border-radius: 999px;
  background: var(--phone-onbg-12);
  transition: background 0.2s ease;
}
.switch::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--phone-onbg-45);
  transition: transform 0.2s ease, background 0.2s ease;
}
.switch[aria-checked="true"] { background: var(--phone-primary); }
.switch[aria-checked="true"]::after {
  transform: translateX(20px);
  background: var(--phone-surface);
}

/* slider */
.app-slider {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.28s ease, opacity 0.28s ease, margin-top 0.28s ease;
}
.app-slider.is-open {
  max-height: 96px;
  opacity: 1;
  margin-top: 18px;
}
.app-slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 30px;
  background: transparent;
  outline: none;
  cursor: pointer;
  margin: 0;
}
.app-slider input[type="range"]::-webkit-slider-runnable-track {
  height: 30px;
  border-radius: 15px;
  background:
    linear-gradient(to right,
      var(--phone-primary) 0%, var(--phone-primary) var(--fill, 50%),
      var(--phone-track) var(--fill, 50%), var(--phone-track) 100%);
}
.app-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 30px;
  height: 30px;
  margin-top: 0;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--phone-surface);
  border: 5px solid var(--phone-primary);
  cursor: grab;
}
.app-slider input[type="range"]::-webkit-slider-thumb:active { cursor: grabbing; }
.app-slider input[type="range"]::-moz-range-track {
  height: 30px;
  border-radius: 15px;
  background:
    linear-gradient(to right,
      var(--phone-primary) 0%, var(--phone-primary) var(--fill, 50%),
      var(--phone-track) var(--fill, 50%), var(--phone-track) 100%);
}
.app-slider input[type="range"]::-moz-range-thumb {
  width: 30px;
  height: 30px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--phone-surface);
  border: 5px solid var(--phone-primary);
  cursor: grab;
}
.app-slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--phone-onbg-35);
  padding: 0 4px;
  margin-top: 6px;
}
.app-footer {
  margin-top: 12px;
  text-align: center;
  font-size: 12px;
  color: var(--phone-onbg-35);
}

/* screensaver (screen-off) */
.screensaver {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: #000;
  color: #e2e8f0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s ease, visibility 0.45s;
  cursor: pointer;
}
.screensaver.is-on { opacity: 1; visibility: visible; }
.screensaver-clock {
  font-size: 60px;
  font-weight: 300;
  font-variant-numeric: tabular-nums;
  letter-spacing: 2px;
}
.screensaver-hint { font-size: 13px; color: #64748b; }

.demo-caption {
  max-width: 560px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-faint);
}

/* ---------- Features ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent-strong);
  margin-bottom: 18px;
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.feature-card p { font-size: 0.95rem; color: var(--text-muted); }

/* ---------- Download ---------- */
.download-card {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  width: min(500px, 100%);
  margin: 0 auto;
}
.download-icon {
  width: 88px;
  height: 88px;
  border-radius: 20px;
  box-shadow: var(--shadow-md);
}
.download-info { flex: 1; min-width: 200px; }
.download-info h3 { font-size: 1.4rem; display: flex; align-items: center; gap: 10px; }
.version-tag {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-strong);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
  font-variant-numeric: tabular-nums;
}
.download-info p { margin-top: 8px; color: var(--text-muted); font-size: 0.95rem; }
.download-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1 1 320px;
  min-width: 260px;
}
.download-actions .btn {
  justify-content: center;
}
.download-actions-row {
  display: flex;
  gap: 12px;
}
.download-actions-row .btn {
  flex: 1;
  min-width: 0;
}
.download-note {
  margin: 28px auto 0;
  max-width: 640px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-faint);
}

/* ---------- Guide ---------- */
.guide-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: start;
}
.guide-layout > * { min-width: 0; }
.step-list { display: flex; flex-direction: column; gap: 20px; }
.step-list li { display: flex; gap: 16px; }
.step-num {
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 800;
  font-size: 0.95rem;
  box-shadow: var(--shadow-accent);
}
.step-list h3 { font-size: 1.05rem; margin-bottom: 4px; }
.step-list p { color: var(--text-muted); font-size: 0.95rem; }

.guide-tip {
  margin-top: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 14px 16px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* code block */
.code-block {
  margin-top: 24px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.code-block-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}
.code-block-dots { display: flex; gap: 6px; }
.code-block-dots i {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: block;
}
.code-block-dots i:nth-child(1) { background: #F87171; }
.code-block-dots i:nth-child(2) { background: #FBBF24; }
.code-block-dots i:nth-child(3) { background: #34D399; }
.copy-btn {
  margin-left: auto;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 8px;
  transition: all 0.16s ease;
}
.copy-btn:hover { color: var(--accent-strong); border-color: var(--accent); }
.copy-btn.is-copied { color: #16A34A; border-color: #16A34A; }
.code-block pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: hidden;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--text);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.code-block pre code { white-space: pre-wrap; }
.code-block--mini { margin-top: 10px; }

.guide-aside { display: flex; flex-direction: column; gap: 16px; }
.aside-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
}
.aside-block h3 { font-size: 1rem; margin-bottom: 8px; }
.aside-block p { font-size: 0.9rem; color: var(--text-muted); }

/* ---------- Privacy ---------- */
.privacy-table-wrap {
  max-width: 720px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.privacy-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.privacy-table th, .privacy-table td {
  text-align: left;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.privacy-table thead th {
  background: var(--bg-alt);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.privacy-table tbody tr:last-child td { border-bottom: none; }
.privacy-table tbody tr:hover { background: var(--surface-2); }
.privacy-table code {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--accent-strong);
  white-space: normal;
  overflow-wrap: anywhere;
}

.privacy-note {
  max-width: 720px;
  margin: 28px auto 0;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 20px;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  border: 1px solid var(--border);
}
.privacy-note svg { width: 22px; height: 22px; flex: none; color: var(--accent-strong); margin-top: 2px; }
.privacy-note p { font-size: 0.95rem; color: var(--text); }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.16s ease;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { background: var(--bg-alt); }
.faq-item[open] summary { border-bottom: 1px solid var(--border); }
.faq-item p { padding: 18px 22px; color: var(--text-muted); font-size: 0.95rem; }
.faq-chevron {
  flex: none;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}
.faq-item[open] .faq-chevron { transform: rotate(-135deg); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 64px 0 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  flex-wrap: wrap;
  padding-bottom: 48px;
}
.footer-tagline { margin-top: 16px; max-width: 280px; color: var(--text-muted); font-size: 0.92rem; }
.footer-links { display: flex; gap: 56px; flex-wrap: wrap; }
.footer-col { display: flex; flex-direction: column; gap: 12px; }
.footer-col h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  margin-bottom: 4px;
}
.footer-col a { color: var(--text-muted); font-size: 0.92rem; transition: color 0.16s ease; }
.footer-col a:hover { color: var(--accent-strong); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 24px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-faint);
}
.footer-made .heart { color: #EF4444; }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in-view { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { order: -1; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-layout { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 12px 20px 20px;
    gap: 4px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    box-shadow: var(--shadow-lg);
  }
  .site-nav.is-open { transform: none; opacity: 1; visibility: visible; }
  .site-nav a { padding: 12px 14px; font-size: 1rem; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .section { padding: 72px 0; }
  .feature-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }
  .download-card { justify-content: center; text-align: center; }
  .download-info { min-width: 0; }
  .download-actions { flex: 1 1 100%; min-width: 0; }
  .download-actions-row { flex-direction: column; }
  .download-info h3 { justify-content: center; }
  .footer-inner { flex-direction: column; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }

  .header-inner { gap: 12px; }
  .site-header .brand { gap: 8px; }
  .site-header .brand-mark { width: 34px; height: 34px; }
  .site-header .brand-mark svg { width: 20px; height: 20px; }
  .site-header .brand-sub { display: none; }
  .header-actions { gap: 8px; }
  .icon-btn { width: 36px; height: 36px; }
  .lang-btn { padding: 6px 9px; font-size: 0.78rem; }

  .float-chip--tl { left: -8px; }
  .float-chip--br { right: -8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}