/* JiGuang Apps — light/dark follows the system; glass surfaces echo the macOS apps. */
:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --bg-glow: radial-gradient(1200px 600px at 10% -10%, rgba(120, 140, 255, 0.18), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(255, 150, 90, 0.14), transparent 60%);
  --text: #1d1d1f;
  --muted: #55555c;
  --line: rgba(0, 0, 0, 0.1);
  --surface: rgba(255, 255, 255, 0.72);
  --surface-strong: rgba(255, 255, 255, 0.9);
  --accent: #0a66d8;
  --accent-ink: #ffffff;
  --accent-fill: #0a66d8;
  --pill: rgba(10, 102, 216, 0.1);
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset, 0 12px 32px rgba(15, 20, 40, 0.08);
  --radius: 22px;
  --gutter: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0c10;
    --bg-glow: radial-gradient(1200px 600px at 10% -10%, rgba(95, 110, 255, 0.22), transparent 60%),
      radial-gradient(900px 500px at 100% 0%, rgba(255, 110, 70, 0.16), transparent 60%);
    --text: #f5f5f7;
    --muted: #a9a9b4;
    --line: rgba(255, 255, 255, 0.12);
    --surface: rgba(255, 255, 255, 0.06);
    --surface-strong: rgba(30, 31, 38, 0.92);
    --accent: #6aa8ff;
    --accent-ink: #06121f;
    --accent-fill: #6aa8ff;
    --pill: rgba(106, 168, 255, 0.14);
    --shadow: 0 1px 0 rgba(255, 255, 255, 0.08) inset, 0 16px 40px rgba(0, 0, 0, 0.35);
  }
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: var(--bg-glow), var(--bg);
  background-attachment: fixed;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

a { color: var(--accent); }

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--accent-ink);
  background: var(--accent-fill);
}
.skip-link:focus { left: 8px; z-index: 10; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.site-header,
main,
.site-footer {
  width: min(100% - 2 * var(--gutter), 1040px);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 10px;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
  padding: 6px 8px 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-strong);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  backdrop-filter: blur(20px) saturate(1.6);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.brand__mark {
  width: 22px;
  height: 22px;
  border-radius: 7px;
  background: linear-gradient(135deg, #5f8bff, #ff7a59);
}

.header-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 16px;
  border-radius: 999px;
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}
.header-link:hover { background: var(--pill); }

main { padding-block: 32px 48px; }

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

h1, h2 { margin: 0; letter-spacing: -0.02em; line-height: 1.15; }
h1 { font-size: clamp(34px, 8vw, 56px); }
h2 { margin-bottom: 14px; font-size: 22px; }

.hero { padding: 28px 4px 12px; }
.hero__intro { max-width: 640px; margin: 14px 0 0; color: var(--muted); font-size: 18px; }

.section { margin-top: 40px; }

.app-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.app-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas: 'icon body' 'icon state';
  align-items: center;
  gap: 2px 14px;
  min-height: 96px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface);
  -webkit-backdrop-filter: blur(18px) saturate(1.5);
  backdrop-filter: blur(18px) saturate(1.5);
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: transform 160ms ease;
}
.app-card:hover { transform: translateY(-2px); }
.app-card .app-icon { grid-area: icon; }
.app-card__body { grid-area: body; display: grid; gap: 2px; min-width: 0; }
.app-card__body strong { font-size: 18px; }
.app-card__body span:last-child { color: var(--muted); font-size: 15px; }
.app-card__category { color: var(--muted); font-size: 13px; font-weight: 600; }
.app-card__state {
  grid-area: state;
  width: fit-content;
  padding: 2px 10px;
  border-radius: 999px;
  color: var(--accent);
  background: var(--pill);
  font-size: 13px;
  font-weight: 600;
}

.principles {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.principles li {
  display: grid;
  gap: 4px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.principles span { color: var(--muted); }

.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; }
.breadcrumb a { display: inline-flex; min-height: 44px; align-items: center; }

.app-hero { display: flex; align-items: center; gap: 18px; margin-top: 8px; }
.app-hero .app-icon { flex: 0 0 auto; filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.14)); }
.app-hero h1 { font-size: clamp(30px, 7vw, 48px); }
.app-hero__tagline { margin: 6px 0 0; color: var(--muted); font-size: 18px; }

.lead { max-width: 720px; margin: 22px 0 0; font-size: 18px; }

.download { display: grid; gap: 8px; margin-top: 22px; }
.download__note { margin: 0; color: var(--muted); font-size: 14px; }

.button {
  display: inline-flex;
  width: fit-content;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
}
.button--primary { color: var(--accent-ink); background: var(--accent-fill); }

.status-pill {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 6px 14px;
  border-radius: 999px;
  color: var(--accent);
  background: var(--pill);
  font-weight: 700;
}

.feature-list { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.feature-list li {
  position: relative;
  padding: 14px 16px 14px 40px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
}
.feature-list li::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
}

.facts dl { display: grid; gap: 12px; margin: 0; }
.facts dl > div { padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.facts dt { color: var(--muted); font-size: 14px; font-weight: 600; }
.facts dd { margin: 4px 0 0; }
.facts dd ul { margin: 0; padding-left: 18px; }

.site-footer {
  padding: 24px 4px 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}
.site-footer p { margin: 4px 0; }
.site-footer a { display: inline-flex; min-height: 44px; align-items: center; }

@media (min-width: 720px) {
  :root { --gutter: 32px; }
  .app-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .principles { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .facts dl { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1000px) {
  .app-grid:not(.app-grid--compact) { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  .app-card { transition: none; }
  .app-card:hover { transform: none; }
}