/* ══════════════════════════════════════════════
   GBT小土豆 · Shared Design System v5.0
   ══════════════════════════════════════════════ */
:root {
  --bg: #000;
  --bg2: #08080c;
  --bg3: #111118;
  --fg: #f5f5f7;
  --dim: #86868b;
  --accent: #ff6b35;
  --accent2: #ff9a56;
  --blue: #2997ff;
  --green: #30d158;
  --red: #ff4757;
  --border: rgba(255, 255, 255, .06);
  --radius: 18px;
  --radius-sm: 10px;
  --font: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  line-height: 1.47;
  -webkit-font-smoothing: antialiased;
  letter-spacing: -.01em;
}

::selection { background: var(--accent); color: #fff; }

/* ── Nav ─────────────────────────── */
.gbt-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(0,0,0,.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}
.gbt-nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 52px; max-width: 1200px; margin: 0 auto; padding: 0 24px;
}
.gbt-nav-brand {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; color: var(--fg); font-weight: 600; font-size: 15px;
}
.gbt-nav-brand svg { height: 28px; width: 28px; border-radius: 7px; }
.gbt-nav-links { display: flex; gap: 28px; }
.gbt-nav-links a {
  color: var(--dim); text-decoration: none; font-size: 13px; font-weight: 500;
  transition: color .2s;
}
.gbt-nav-links a:hover, .gbt-nav-links a.active { color: var(--fg); }

/* ── Buttons ──────────────────────── */
.btn {
  display: inline-flex; align-items: center; padding: 14px 30px;
  border-radius: 28px; font-size: 15px; font-weight: 600;
  text-decoration: none; transition: all .25s; border: none; cursor: pointer;
}
.btn-primary {
  background: var(--accent); color: #fff;
  animation: glowPulse 3s ease-in-out infinite;
}
.btn-primary:hover { background: var(--accent2); transform: translateY(-1px); }
.btn-outline {
  background: transparent; color: var(--fg);
  border: 1px solid rgba(255,255,255,.15);
}
.btn-outline:hover { border-color: rgba(255,255,255,.3); }
.btn-sm {
  padding: 8px 18px; border-radius: 20px; font-size: 13px; font-weight: 600;
  text-decoration: none; background: var(--accent); color: #fff;
  transition: all .2s; border: none; cursor: pointer;
}
.btn-sm:hover { background: var(--accent2); }

@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 20px rgba(255,107,53,.2); }
  50% { box-shadow: 0 0 40px rgba(255,107,53,.4), 0 0 80px rgba(255,107,53,.1); }
}

/* ── Layout ───────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 120px 0; }
.section-label {
  font-size: 12px; font-weight: 600; letter-spacing: 3px;
  color: var(--accent); text-transform: uppercase; margin-bottom: 16px;
}
.section h2 {
  font-size: clamp(32px, 5vw, 52px); font-weight: 700;
  letter-spacing: -.03em; margin-bottom: 16px; line-height: 1.1;
}
.section-sub {
  color: var(--dim); font-size: 16px; max-width: 480px;
  margin-bottom: 48px; line-height: 1.6;
}
.hl { color: var(--accent); }

/* ── Cards ────────────────────────── */
.card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px; transition: all .3s;
}
.card:hover { border-color: rgba(255,255,255,.12); transform: translateY(-2px); }

/* ── Footer ───────────────────────── */
.gbt-footer {
  padding: 48px 0 32px; border-top: 1px solid var(--border);
  background: var(--bg);
}
.gbt-footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  margin-bottom: 32px;
}
.gbt-footer h5 {
  font-size: 12px; font-weight: 600; letter-spacing: 1px;
  color: var(--fg); margin-bottom: 12px; text-transform: uppercase;
}
.gbt-footer a {
  color: var(--dim); text-decoration: none; font-size: 13px;
  display: block; margin-bottom: 6px; line-height: 1.8;
}
.gbt-footer a:hover { color: var(--fg); }
.gbt-footer-bottom {
  padding-top: 24px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; color: var(--dim);
  font-size: 12px; flex-wrap: wrap; gap: 12px;
}

/* ── Stats Bar ────────────────────── */
.stats { display: flex; justify-content: center; gap: 64px; padding: 48px 0; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-num { font-size: 40px; font-weight: 700; }
.stat-num.g { color: var(--green); }
.stat-num.o { color: var(--accent); }
.stat-num.b { color: var(--blue); }
.stat-label { font-size: 12px; color: var(--dim); margin-top: 4px; letter-spacing: .5px; }

/* ── Utility ──────────────────────── */
.reveal { opacity: 0; transform: translateY(24px); transition: all .7s cubic-bezier(.16,1,.3,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.text-center { text-align: center; }
.mt-48 { margin-top: 48px; }

/* ── Responsive ───────────────────── */
@media (max-width: 768px) {
  .gbt-nav-links { display: none; }
  .gbt-footer-grid { grid-template-columns: 1fr 1fr; }
  .stats { gap: 32px; }
  .section { padding: 80px 0; }
}

/* ── Legal Pages ───────────────────── */
.legal-content { max-width: 800px; margin: 0 auto; padding: 100px 24px 80px; }
.legal-content h1 { font-size: clamp(28px, 4vw, 40px); font-weight: 700; letter-spacing: -.02em; margin-bottom: 8px; }
.legal-content .last-updated { color: var(--dim); font-size: 13px; margin-bottom: 40px; }
.legal-content h2 { font-size: 22px; font-weight: 600; margin-top: 44px; margin-bottom: 14px; padding-top: 16px; border-top: 1px solid var(--border); }
.legal-content h3 { font-size: 17px; font-weight: 600; margin-top: 28px; margin-bottom: 10px; color: var(--accent2); }
.legal-content p { color: var(--dim); font-size: 14px; margin-bottom: 12px; line-height: 1.7; }
.legal-content li { color: var(--dim); font-size: 14px; margin-bottom: 8px; line-height: 1.7; }
.legal-content ul, .legal-content ol { padding-left: 24px; margin-bottom: 16px; }
.legal-content strong { color: var(--fg); }
.legal-content a { color: var(--accent); text-decoration: none; }
.legal-content a:hover { text-decoration: underline; }
.legal-content table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
.legal-content th { padding: 12px 16px; text-align: left; color: var(--fg); font-weight: 600; background: var(--bg2); border-bottom: 1px solid var(--border); }
.legal-content td { padding: 12px 16px; color: var(--dim); border-bottom: 1px solid var(--border); }
.legal-content code { background: var(--bg3); padding: 2px 6px; border-radius: 4px; font-size: 13px; color: var(--accent2); }
.highlight { background: rgba(255,107,53,.08); border-left: 3px solid var(--accent); padding: 16px 20px; border-radius: 0 8px 8px 0; margin: 20px 0; }
.highlight p { color: var(--fg); margin: 0; }
.guarantee-box { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; text-align: center; margin: 32px 0; }
.guarantee-box .g-icon { font-size: 48px; margin-bottom: 12px; }
.guarantee-box h3 { color: var(--green); font-size: 20px; margin-top: 0; border: none; padding: 0; }
.subtle { font-size: 12px; color: var(--dim); }

@media (max-width: 768px) {
  .legal-content { padding: 80px 20px 60px; }
}