/* === Design Tokens === */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --bg-elevated: #1f1f1f;
  --bg-hover: #252525;
  --text-primary: #f5f5f5;
  --text-secondary: #a8a8a8;
  --text-tertiary: #737373;
  --accent-primary: #f97316;
  --accent-hover: #fb923c;
  --accent-light: #fdba74;
  --accent-subtle: rgba(249, 115, 22, 0.12);
  --accent-glow: rgba(249, 115, 22, 0.25);
  --border-primary: #262626;
  --border-secondary: #1f1f1f;
  --success: #10b981;
  --font-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --max-width: 1200px;
  --radius: 12px;
  --radius-sm: 8px;
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: var(--font-base);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* === Navigation === */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-primary);
  transition: background 0.3s;
}
.nav-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.nav-logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 1.2rem; color: var(--text-primary);
}
.logo-icon { width: 28px; height: 28px; }
.nav-links { display: flex; gap: 8px; }
.nav-link {
  padding: 6px 14px; border-radius: 6px; font-size: 0.9rem; color: var(--text-secondary);
  transition: color 0.2s, background 0.2s; cursor: pointer;
}
.nav-link:hover, .nav-link.active { color: var(--text-primary); background: var(--bg-hover); }
.nav-cta { font-size: 0.875rem; padding: 8px 20px; }

/* === Buttons === */
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--accent-primary); color: #fff; border: none; border-radius: var(--radius-sm);
  font-weight: 600; cursor: pointer; transition: all 0.2s; text-decoration: none;
  padding: 10px 24px; font-size: 0.95rem;
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 0 24px var(--accent-glow); }
.btn-ghost {
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent; color: var(--text-secondary); border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm); font-weight: 500; cursor: pointer; transition: all 0.2s;
  padding: 10px 24px; font-size: 0.95rem; text-decoration: none;
}
.btn-ghost:hover { color: var(--text-primary); border-color: var(--text-tertiary); }
.btn-lg { padding: 14px 36px; font-size: 1.05rem; border-radius: var(--radius); }

/* === Gradient Text === */
.gradient-text {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* === Hero === */
.hero {
  position: relative; padding: 160px 0 100px; text-align: center; overflow: hidden;
}
.hero-glow {
  position: absolute; top: -200px; left: 50%; transform: translateX(-50%);
  width: 800px; height: 600px;
  background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none; opacity: 0.4;
}
.hero-badge {
  display: inline-block; padding: 6px 16px; border-radius: 20px; font-size: 0.85rem;
  background: var(--accent-subtle); color: var(--accent-primary); border: 1px solid rgba(249,115,22,0.2);
  margin-bottom: 24px; font-weight: 500;
}
.hero-title { font-size: 3.2rem; font-weight: 800; line-height: 1.2; margin-bottom: 20px; letter-spacing: -0.02em; min-height: 2.4em; }
.typewriter { display: inline; }
.typewriter-cursor {
  display: inline-block; color: var(--accent-primary); font-weight: 300;
  animation: blink 0.8s step-end infinite; margin-left: 2px;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
.hero-subtitle { font-size: 1.15rem; color: var(--text-secondary); max-width: 680px; margin: 0 auto 16px; line-height: 1.7; }
.hero-desc { font-size: 0.95rem; color: var(--text-tertiary); max-width: 600px; margin: 0 auto 36px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 48px; flex-wrap: wrap; }
.hero-trust { display: flex; gap: 32px; justify-content: center; flex-wrap: wrap; }
.trust-item {
  display: flex; align-items: center; gap: 8px; font-size: 0.9rem; color: var(--text-secondary);
}

/* === Sections === */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-secondary); }
.section-title { font-size: 2.2rem; font-weight: 700; text-align: center; margin-bottom: 12px; }
.section-desc { text-align: center; color: var(--text-secondary); max-width: 700px; margin: 0 auto 56px; font-size: 1rem; }

/* === Cards Grid === */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: var(--bg-tertiary); border: 1px solid var(--border-primary); border-radius: var(--radius);
  padding: 32px 28px; transition: all 0.25s;
}
.card:hover { border-color: rgba(249,115,22,0.3); transform: translateY(-4px); box-shadow: 0 8px 32px rgba(0,0,0,0.3); }
.card-icon { width: 44px; height: 44px; margin-bottom: 16px; }
.card-icon svg { width: 100%; height: 100%; }
.card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* === Model Grid === */
.model-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.model-card {
  display: flex; align-items: center; gap: 12px; padding: 16px 20px;
  background: var(--bg-tertiary); border: 1px solid var(--border-primary); border-radius: var(--radius-sm);
  transition: all 0.2s; cursor: pointer; text-decoration: none; color: inherit;
}
.model-card:hover { border-color: rgba(249,115,22,0.3); background: var(--bg-elevated); }
.model-logo {
  width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center;
  background: var(--accent-subtle); color: var(--accent-primary); font-weight: 700; font-size: 1.1rem; flex-shrink: 0;
}
.model-name { font-size: 0.9rem; font-weight: 600; }
.model-tag { font-size: 0.75rem; color: var(--accent-primary); margin-top: 2px; }

/* === API Types === */
.subsection-title { font-size: 1.4rem; font-weight: 700; text-align: center; margin: 56px 0 28px; }
.api-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.api-card {
  background: var(--bg-tertiary); border: 1px solid var(--border-primary); border-radius: var(--radius);
  padding: 20px 24px; transition: all 0.2s;
}
.api-card:hover { border-color: rgba(249,115,22,0.3); }
.api-header { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.api-badge {
  padding: 3px 10px; border-radius: 6px; font-size: 0.75rem; font-weight: 600;
  background: rgba(16,185,129,0.12); color: #10b981;
}
.api-badge.claude { background: var(--accent-subtle); color: var(--accent-primary); }
.api-badge.gemini { background: rgba(59,130,246,0.12); color: #3b82f6; }
.api-name { font-weight: 600; font-size: 0.95rem; }
.api-url {
  display: block; font-size: 0.8rem; color: var(--text-tertiary); font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  background: var(--bg-primary); padding: 8px 12px; border-radius: 6px; word-break: break-all;
}

/* === Monitor === */
.monitor-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.monitor-card {
  background: var(--bg-tertiary); border: 1px solid var(--border-primary); border-radius: var(--radius);
  padding: 24px;
}
.monitor-header { display: flex; align-items: center; gap: 10px; font-weight: 600; margin-bottom: 16px; font-size: 1rem; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.status-dot.online { background: var(--success); box-shadow: 0 0 8px rgba(16,185,129,0.5); }
.monitor-stats { display: flex; gap: 24px; margin-bottom: 14px; }
.stat { display: flex; flex-direction: column; }
.stat-label { font-size: 0.75rem; color: var(--text-tertiary); }
.stat-value { font-size: 0.95rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.stat-value.good { color: var(--success); }
.monitor-bar { height: 4px; background: var(--bg-hover); border-radius: 2px; overflow: hidden; }
.monitor-fill { height: 100%; background: var(--success); border-radius: 2px; transition: width 1s ease; }
.monitor-link { text-align: center; margin-top: 32px; }
.monitor-link .btn-ghost { display: inline-flex; align-items: center; gap: 8px; }

/* === Bridge / Price Advantage === */
.bridge {
  display: flex; align-items: center; justify-content: center; gap: 18px;
  padding: 48px 40px; position: relative; margin-top: 8px;
  border: 1px solid rgba(249, 115, 22, 0.12); border-radius: 32px;
  background:
    radial-gradient(circle at 50% 50%, rgba(249,115,22,0.08) 0%, rgba(249,115,22,0.02) 18%, transparent 42%),
    linear-gradient(180deg, rgba(26,26,26,0.96) 0%, rgba(17,17,17,0.88) 100%);
  box-shadow: 0 24px 64px rgba(0,0,0,0.3); overflow: hidden;
}
.bridge::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(circle at center, rgba(0,0,0,0.7), transparent 88%);
  pointer-events: none;
}
.bridge::after {
  content: ''; position: absolute; inset: auto -10% -45% auto;
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(249,115,22,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.bridge-col { display: flex; flex-direction: column; align-items: center; gap: 18px; position: relative; z-index: 2; }
.bridge-providers { display: flex; flex-direction: column; gap: 14px; }
.bridge-node {
  display: flex; align-items: center; gap: 14px;
  background: rgba(31,31,31,0.86); border: 1px solid var(--border-primary);
  border-radius: 20px; padding: 16px 20px; min-width: 240px;
  box-shadow: 0 10px 28px rgba(0,0,0,0.2);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.bridge-node:hover { border-color: rgba(249,115,22,0.32); box-shadow: 0 16px 34px rgba(0,0,0,0.3); transform: translateX(-6px); }
.bridge-node-icon {
  width: 36px; height: 36px; border-radius: 10px; flex-shrink: 0;
  background: var(--accent-subtle); color: var(--accent-primary);
  display: flex; align-items: center; justify-content: center;
}
.bridge-node-icon svg { width: 20px; height: 20px; }
.node-name { font-weight: 600; font-size: 15px; color: var(--text-primary); line-height: 1.2; }
.node-vendor { font-size: 12px; color: var(--text-tertiary); }

.bridge-center { display: flex; flex-direction: column; align-items: center; gap: 14px; z-index: 3; position: relative; }
.bridge-hub {
  width: 68px; height: 68px;
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-light) 100%);
  border-radius: 20px; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 14px 30px var(--accent-glow), 0 0 0 8px rgba(249,115,22,0.12);
  position: relative; animation: hub-glow 3s ease-in-out infinite;
}
.bridge-hub::before, .bridge-hub::after {
  content: ''; position: absolute; inset: 50%; transform: translate(-50%, -50%);
  border-radius: 28px; pointer-events: none;
}
.bridge-hub::before { width: 100px; height: 100px; border: 1px solid rgba(249,115,22,0.18); }
.bridge-hub::after { width: 130px; height: 130px; border: 1px dashed rgba(249,115,22,0.12); }
@keyframes hub-glow {
  0%, 100% { box-shadow: 0 12px 28px rgba(249,115,22,0.18), 0 0 0 8px rgba(249,115,22,0.1); }
  50% { box-shadow: 0 18px 40px rgba(249,115,22,0.3), 0 0 0 10px rgba(249,115,22,0.15); }
}
.bridge-hub-label { font-weight: 700; font-size: 14px; letter-spacing: 0.02em; color: var(--accent-primary); }

.bridge-line { width: 104px; height: 14px; position: relative; z-index: 1; overflow: hidden; }
.bridge-line::before {
  content: ''; position: absolute; top: 50%; left: 0; width: 200%; height: 2px; transform: translateY(-50%);
  background: linear-gradient(90deg, transparent 0%, rgba(249,115,22,0.42) 12%, rgba(249,115,22,0.92) 50%, rgba(249,115,22,0.42) 88%, transparent 100%);
}
.bridge-line::after {
  content: ''; position: absolute; top: 50%; left: -20%; width: 36px; height: 8px;
  border-radius: 999px; transform: translateY(-50%); filter: blur(0.2px);
  background: linear-gradient(90deg, rgba(255,255,255,0), rgba(255,255,255,0.7), rgba(255,255,255,0));
  animation: flow-line 1.6s linear infinite;
}
@keyframes flow-line { 0% { transform: translate(-10%, -50%); } 100% { transform: translate(300%, -50%); } }
.bridge-line-reverse::before { transform: translateY(-50%) scaleX(-1); }
.bridge-line-reverse::after { animation-direction: reverse; }

.bridge-user {
  display: flex; align-items: center; gap: 14px;
  background: rgba(31,31,31,0.92); border: 1px solid var(--border-primary);
  border-radius: 22px; padding: 18px 22px; min-width: 220px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.2);
}
.bridge-user-icon {
  width: 44px; height: 44px;
  background: linear-gradient(180deg, var(--accent-primary) 0%, var(--accent-hover) 100%);
  border-radius: 14px; display: flex; align-items: center; justify-content: center; color: #fff;
}

.cost-chips { display: flex; justify-content: center; gap: 20px; margin-top: 28px; flex-wrap: wrap; }
.cost-chip {
  display: flex; align-items: center; gap: 10px;
  background: var(--bg-tertiary); border: 1px solid var(--border-primary);
  border-radius: 100px; padding: 11px 20px; font-size: 14px; font-weight: 500; color: var(--text-secondary);
}
.cost-val { font-weight: 700; color: var(--accent-primary); }

@media (max-width: 1024px) {
  .bridge { flex-wrap: wrap; gap: 24px; padding: 32px 24px; }
  .bridge-line { width: 40px; }
}
@media (max-width: 768px) {
  .bridge { display: none; }
  .cost-chips { flex-direction: column; align-items: center; }
  .cost-chip { width: 100%; max-width: 280px; justify-content: center; }
}

/* === Steps === */
.steps { display: flex; align-items: center; justify-content: center; gap: 16px; margin-bottom: 56px; flex-wrap: wrap; }
.step {
  background: var(--bg-tertiary); border: 1px solid var(--border-primary); border-radius: var(--radius);
  padding: 32px; text-align: center; flex: 1; min-width: 200px; max-width: 280px;
}
.step-num { font-size: 2rem; font-weight: 800; color: var(--accent-primary); margin-bottom: 12px; }
.step h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.step p { font-size: 0.875rem; color: var(--text-secondary); }
.step-arrow { color: var(--accent-primary); flex-shrink: 0; }

/* === Tutorials Grid === */
.tutorials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.tutorial-card {
  background: var(--bg-primary); border: 1px solid var(--border-primary); border-radius: var(--radius);
  padding: 28px; transition: all 0.2s;
}
.tutorial-card:hover { border-color: rgba(249,115,22,0.3); }
.tutorial-icon { width: 40px; height: 40px; margin-bottom: 14px; }
.tutorial-icon svg { width: 100%; height: 100%; }
.tutorial-card h4 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.tutorial-card p { font-size: 0.875rem; color: var(--text-secondary); }

/* === Contact === */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 64px; }
.contact-card {
  background: var(--bg-tertiary); border: 1px solid var(--border-primary); border-radius: var(--radius);
  padding: 32px; text-align: center;
}
.contact-icon { width: 48px; height: 48px; margin: 0 auto 16px; }
.contact-icon svg { width: 100%; height: 100%; }
.contact-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.contact-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* === CTA Final === */
.cta-final {
  text-align: center; padding: 56px 40px; border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(249,115,22,0.08), rgba(249,115,22,0.02));
  border: 1px solid rgba(249,115,22,0.15);
}
.cta-final h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 12px; }
.cta-final-desc { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 24px; }
.cta-final-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* === Footer === */
.footer { padding: 32px 0; border-top: 1px solid var(--border-primary); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; }
.footer-copy { font-size: 0.8rem; color: var(--text-tertiary); }

/* === Mobile Toggle === */
.mobile-toggle {
  display: none; background: none; border: none; cursor: pointer; padding: 8px;
  flex-direction: column; gap: 5px;
}
.mobile-toggle span { display: block; width: 22px; height: 2px; background: var(--text-primary); border-radius: 1px; transition: all 0.3s; }

/* === Responsive === */
.mobile-br { display: none; }
@media (max-width: 1024px) {
  .model-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .nav-links { display: none; position: fixed; top: 64px; left: 0; right: 0; background: var(--bg-secondary); flex-direction: column; padding: 16px; border-bottom: 1px solid var(--border-primary); gap: 4px; z-index: 100; }
  .nav-links.open { display: flex; }
  .nav-cta { display: none; }
  .mobile-toggle { display: flex; }
  .hero { padding: 120px 0 64px; }
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 1rem; }
  .hero-desc br { display: none; }
  .section { padding: 64px 0; }
  .section-title { font-size: 1.6rem; }
  .section-desc { font-size: 0.9rem; }
  .grid-3, .tutorials-grid, .contact-grid, .api-grid { grid-template-columns: 1fr; }
  .model-grid { grid-template-columns: repeat(2, 1fr); }
  .monitor-grid { grid-template-columns: 1fr; }
  .steps { flex-direction: column; }
  .step-arrow { transform: rotate(90deg); }
  .step { max-width: 100%; }
  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
  .hero-trust { flex-direction: column; align-items: center; gap: 12px; }
  .container { padding: 0 16px; }
  .mobile-br { display: inline; }
}

.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease, transform 0.5s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
}