:root {
  --bg: #eaf6ff;
  --bg-2: #ffffff;
  --card: rgba(255, 255, 255, 0.75);
  --card-hover: rgba(255, 255, 255, 0.95);
  --border: rgba(14, 165, 233, 0.18);
  --border-strong: rgba(14, 165, 233, 0.4);
  --text: #0f2942;
  --text-dim: #476381;
  --text-mute: #7891a8;
  --brand: #0ea5e9;
  --brand-2: #06b6d4;
  --grad: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 50%, #14b8a6 100%);
  --paid: #f97316;
  --free: #10b981;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(125, 211, 252, 0.55), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(94, 234, 212, 0.4), transparent 60%),
    radial-gradient(700px 400px at 50% 100%, rgba(186, 230, 253, 0.6), transparent 60%);
  background-attachment: fixed;
}

.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s, box-shadow .2s, background .2s, border-color .2s;
}
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 15px; }
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 8px 24px -8px rgba(14, 165, 233, 0.55);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 14px 30px -8px rgba(14, 165, 233, 0.7); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.7);
  color: var(--text);
  border-color: var(--border-strong);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.95); }

/* hero */
.hero {
  position: relative;
  padding: 80px 0 80px;
  text-align: center;
}
.logo-inline {
  display: inline-block;
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 28px;
  color: var(--text);
  letter-spacing: 0.3px;
}
.badge {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid rgba(249, 115, 22, 0.4);
  border-radius: 999px;
  font-size: 12px;
  color: #c2410c;
  margin-bottom: 24px;
  background: rgba(255, 237, 213, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* feature pills - 突出"慢"和"不稳定" */
.feature-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 12px;
  margin-bottom: 48px;
}
.feature-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  text-align: left;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 6px 18px -10px rgba(14, 165, 233, 0.25);
}
.feature-emoji { font-size: 28px; line-height: 1; }
.feature-title { font-weight: 700; font-size: 15px; color: var(--text); }
.feature-sub { font-size: 12px; color: var(--text-dim); margin-top: 2px; }
.hero-title {
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
  color: var(--text);
}
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
  margin-left: 8px;
}
.hero-sub {
  color: var(--text-dim);
  font-size: 16px;
  max-width: 720px;
  margin: 0 auto 36px;
}
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* section */
.section { padding: 64px 0; }
.section-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.section-sub {
  color: var(--text-dim);
  margin-bottom: 32px;
  font-size: 15px;
}

/* endpoints */
.endpoints {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 20px;
}
.endpoint-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px -12px rgba(14, 165, 233, 0.25);
  transition: border-color .2s, background .2s, transform .15s, box-shadow .2s;
}
.endpoint-card:hover {
  border-color: var(--border-strong);
  background: var(--card-hover);
  transform: translateY(-2px);
  box-shadow: 0 14px 32px -12px rgba(14, 165, 233, 0.35);
}
.endpoint-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.endpoint-tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
}
.tag-blue { background: rgba(14, 165, 233, 0.14); color: #0369a1; }
.tag-teal { background: rgba(20, 184, 166, 0.14); color: #0f766e; }
.endpoint-name { color: var(--text-mute); font-size: 13px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.endpoint-url {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #0f2942;
  border: 1px solid rgba(14, 165, 233, 0.25);
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 12px;
}
.endpoint-url code {
  flex: 1;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  color: #e0f2fe;
  word-break: break-all;
}
.copy-btn {
  background: rgba(255, 255, 255, 0.95);
  color: var(--brand);
  border: 1px solid rgba(14, 165, 233, 0.4);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.copy-btn:hover { background: var(--brand); color: #fff; border-color: var(--brand); }
.copy-btn.copied { background: rgba(16, 185, 129, 0.95); color: #fff; border-color: rgba(16, 185, 129, 1); }
.endpoint-desc { color: var(--text-dim); font-size: 13px; }

/* model groups */
.group-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  margin: 36px 0 16px;
  color: var(--text);
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-paid { background: var(--paid); box-shadow: 0 0 12px rgba(249, 115, 22, 0.6); }
.dot-free { background: var(--free); box-shadow: 0 0 12px rgba(16, 185, 129, 0.6); }
.group-label {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}
.label-paid { background: rgba(249, 115, 22, 0.15); color: var(--paid); }
.label-free { background: rgba(16, 185, 129, 0.15); color: var(--free); }

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.model-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 6px 18px -10px rgba(14, 165, 233, 0.2);
  transition: transform .15s, border-color .2s, background .2s, box-shadow .2s;
}
.model-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  background: var(--card-hover);
  box-shadow: 0 14px 28px -10px rgba(14, 165, 233, 0.35);
}
.model-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border);
  padding: 6px;
  flex-shrink: 0;
  object-fit: contain;
}
.model-name { font-weight: 600; font-size: 15px; margin-bottom: 2px; color: var(--text); }
.model-desc { color: var(--text-dim); font-size: 13px; }

/* cta */
.cta { padding: 64px 0; }
.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.12), rgba(20, 184, 166, 0.12));
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  padding: 36px 40px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.cta-inner h2 { font-size: 24px; margin-bottom: 6px; color: var(--text); }
.cta-inner p { color: var(--text-dim); font-size: 14px; }

/* footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  margin-top: 40px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--text-mute);
  font-size: 13px;
}
.footer a { color: var(--text-dim); text-decoration: none; }
.footer a:hover { color: var(--brand); }

@media (max-width: 640px) {
  .hero { padding: 64px 0 48px; }
  .cta-inner { padding: 24px; }
}