/* Shared design system — 简影投屏 / JianYing Projection */

:root {
  --bg: #0d0d0d;
  --surface: #141414;
  --border: #2a2a2a;
  --text: #ccc;
  --text-dim: #777;
  --text-bright: #fff;
  --accent: #fff;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Hides the page for the single frame between HTML parse and i18n apply,
   so a visitor landing on a direct ?lang= URL never sees the wrong language. */
html.i18n-pending body { visibility: hidden; }

/* ---- Nav ---- */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 32px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-brand img { width: 32px; height: 32px; }
.nav-brand span,
.nav-brand a {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-bright);
  letter-spacing: 0.5px;
  text-decoration: none;
}
.nav-lang {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
}
.nav-lang button {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 12px;
  padding: 6px 14px;
  cursor: pointer;
  font-family: var(--font);
  letter-spacing: 0.3px;
}
.nav-lang button.active { color: var(--text-bright); background: var(--surface); }
.nav-lang button + button { border-left: 1px solid var(--border); }

/* ---- Sections ---- */
section { padding: 80px 32px; max-width: 960px; margin: 0 auto; }
section + section { border-top: 1px solid var(--border); }

.section-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-dim);
  margin-bottom: 48px;
  text-align: center;
}

/* ---- Legal pages ---- */
.legal {
  max-width: 760px;
  margin: 0 auto;
  padding: 64px 32px 80px;
}
.legal h1 {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-bright);
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.legal .updated {
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--mono);
  margin-bottom: 48px;
}
.legal h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-bright);
  letter-spacing: 0.3px;
  margin: 40px 0 12px;
}
.legal p,
.legal li { font-size: 14px; color: var(--text); }
.legal p { margin-bottom: 12px; }
.legal ul { margin: 0 0 12px 22px; }
.legal li { margin-bottom: 8px; }
.legal a { color: var(--text-bright); }
.legal strong { color: var(--text-bright); font-weight: 600; }

/* ---- Footer ---- */
footer {
  padding: 48px 32px;
  text-align: center;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.5px;
}
footer a { color: var(--text); text-decoration: none; }
footer a:hover { color: var(--text-bright); }
footer .links {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
footer .footer-contact {
  font-family: var(--mono);
  margin-bottom: 12px;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  section { padding: 56px 20px; }
  nav { padding: 16px 20px; }
  .legal { padding: 40px 20px 56px; }
  .legal h1 { font-size: 22px; }
}