:root {
  --bg: #060a14;
  --bg-2: #0a1120;
  --bg-3: #0e1730;
  --primary: #4f8bff;
  --primary-2: #22d3ee;
  --accent: #a78bfa;
  --gradient: linear-gradient(135deg, #4f8bff, #22d3ee);
  --gradient-2: linear-gradient(135deg, #4f8bff, #a78bfa);
  --text: #e6edf7;
  --text-dim: #8fa3c0;
  --border: rgba(79, 139, 255, 0.18);
  --card-bg: rgba(14, 23, 48, 0.6);
  --radius: 16px;
  --max-w: 1200px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans SC', -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* 背景装饰 */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -3;
  background-image:
    linear-gradient(rgba(79, 139, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 139, 255, 0.06) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}
.bg-glow {
  position: fixed;
  z-index: -2;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
  pointer-events: none;
}
.glow-1 { width: 600px; height: 600px; background: #2a4a8f; top: -200px; left: -100px; }
.glow-2 { width: 500px; height: 500px; background: #0f3a5a; bottom: -100px; right: -100px; }

/* 粒子网络背景 */
#particleCanvas {
  position: fixed; inset: 0; z-index: -1;
  pointer-events: none;
}

/* 滚动进度条 */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--gradient); z-index: 200;
  box-shadow: 0 0 12px rgba(79,139,255,0.6);
}

/* 鼠标跟随光效 */
.cursor-glow {
  position: fixed; width: 260px; height: 260px;
  border-radius: 50%; pointer-events: none; z-index: 1;
  background: radial-gradient(circle, rgba(79,139,255,0.15), transparent 70%);
  transform: translate(-50%, -50%); transition: opacity 0.3s;
  opacity: 0;
}

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

/* ============ 导航栏 ============ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 0;
  transition: all 0.35s ease;
}
.navbar.scrolled {
  background: rgba(6, 10, 20, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.logo-mark {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  background: var(--gradient);
  border-radius: 12px;
  font-size: 22px; font-weight: 900; color: #fff;
  box-shadow: 0 4px 20px rgba(79, 139, 255, 0.4);
}
.logo-text { display: flex; flex-direction: column; line-height: 1.2; color: var(--text); font-weight: 700; font-size: 18px; }
.logo-sub { font-size: 10px; color: var(--text-dim); font-weight: 400; letter-spacing: 2px; }
.nav-menu { display: flex; align-items: center; gap: 32px; }
.nav-link { color: var(--text-dim); text-decoration: none; font-size: 15px; transition: color 0.25s; position: relative; }
.nav-link:hover, .nav-link.active { color: var(--text); }
.nav-link::after {
  content: ''; position: absolute; left: 0; bottom: -6px;
  width: 0; height: 2px; background: var(--gradient); transition: width 0.3s;
}
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.nav-link.btn-cta {
  background: var(--gradient); color: #fff; padding: 8px 20px; border-radius: 8px;
  font-weight: 500;
}
.nav-link.btn-cta::after { display: none; }
.nav-link.btn-cta:hover { opacity: 0.9; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 26px; height: 2px; background: var(--text); transition: all 0.3s; }

/* ============ HERO ============ */
.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 120px 0 60px;
  position: relative;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; z-index: -1; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(6,10,20,0.88) 0%, rgba(6,10,20,0.82) 40%, var(--bg) 100%);
}
.hero-inner { text-align: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 30px;
  background: rgba(79, 139, 255, 0.1);
  border: 1px solid var(--border);
  color: var(--primary-2); font-size: 14px; margin-bottom: 24px;
}
.pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--primary-2); animation: pulse 1.6s infinite; }
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(34,211,238,0.5);} 50% { box-shadow: 0 0 0 8px rgba(34,211,238,0);} }
.hero-title {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 900; line-height: 1.15; letter-spacing: 1px;
  margin-bottom: 24px;
}
.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.tw-cursor {
  display: inline-block; margin-left: 4px;
  color: var(--primary-2); font-weight: 300;
  animation: blink 0.8s step-end infinite;
}
@keyframes blink { 0%,100% { opacity: 1;} 50% { opacity: 0;} }
.hero-sub {
  max-width: 640px; margin: 0 auto 36px;
  color: var(--text-dim); font-size: 17px;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block; padding: 13px 32px; border-radius: 10px;
  font-size: 16px; font-weight: 600; text-decoration: none; cursor: pointer;
  border: none; transition: all 0.3s; font-family: inherit;
}
.btn-primary { background: var(--gradient); color: #fff; box-shadow: 0 6px 24px rgba(79,139,255,0.35); position: relative; overflow: hidden; }
.btn-primary::after {
  content: ''; position: absolute; top: 50%; left: 50%;
  width: 0; height: 0; border-radius: 50%;
  background: rgba(255,255,255,0.4);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s, opacity 0.6s;
}
.btn-primary:hover::after { width: 300px; height: 300px; opacity: 0; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(79,139,255,0.5); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary-2); }
.btn-lg { padding: 15px 44px; font-size: 18px; }
.btn-block { width: 100%; }

/* 算力集群展示 */
.hero-cluster { margin-top: 60px; display: flex; justify-content: center; }
.cluster-orbit { position: relative; width: 340px; height: 340px; }
.cluster-center {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  z-index: 2;
}
.cluster-icon { font-size: 40px; filter: drop-shadow(0 0 20px rgba(79,139,255,0.6)); animation: glow-pulse 2s ease-in-out infinite; }
@keyframes glow-pulse {
  0%,100% { filter: drop-shadow(0 0 15px rgba(79,139,255,0.5)) scale(1); }
  50% { filter: drop-shadow(0 0 30px rgba(34,211,238,0.9)) scale(1.15); }
}
.cluster-label { font-size: 14px; color: var(--text-dim); }
.orbit {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  border: 1px solid rgba(79,139,255,0.25); border-radius: 50%;
}
.orbit-1 { width: 170px; height: 170px; }
.orbit-2 { width: 250px; height: 250px; animation: spin 20s linear infinite; border-style: dashed; }
.orbit-3 { width: 330px; height: 330px; animation: spin 30s linear infinite reverse; }
@keyframes spin { to { transform: translate(-50%, -50%) rotate(360deg); } }
.chip {
  position: absolute; padding: 6px 14px; border-radius: 8px;
  background: var(--card-bg); border: 1px solid var(--border);
  font-size: 13px; font-weight: 500; color: var(--primary-2);
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  animation: float 4s ease-in-out infinite;
}
@keyframes float { 0%,100% { margin-top: 0;} 50% { margin-top: -8px;} }
.chip-1 { top: 12px; left: 50%; transform: translateX(-50%); }
.chip-2 { top: 50%; right: 0; transform: translateY(-50%); }
.chip-3 { bottom: 12px; left: 50%; transform: translateX(-50%); }
.chip-4 { top: 50%; left: 0; transform: translateY(-50%); }
.chip-5 { top: 24%; right: 8%; }
.chip-6 { bottom: 24%; left: 8%; }

.hero-scroll {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  color: var(--text-dim); font-size: 13px; text-align: center;
  animation: bob 2s ease-in-out infinite;
}
@keyframes bob { 0%,100% { transform: translateX(-50%) translateY(0);} 50% { transform: translateX(-50%) translateY(8px);} }
.scroll-line { width: 1px; height: 30px; background: var(--gradient); margin: 8px auto 0; }

/* ============ 统计 ============ */
.stats {
  padding: 20px 0 60px;
  position: relative; z-index: 2;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px 24px;
  backdrop-filter: blur(10px);
}
.stat { text-align: center; position: relative; }
.stat-num { font-size: clamp(32px, 4vw, 46px); font-weight: 900; background: var(--gradient); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; filter: drop-shadow(0 0 12px rgba(79,139,255,0.4)); }
.stat-label { color: var(--text-dim); font-size: 14px; margin-top: 6px; }

/* ============ 通用 section ============ */
.section { padding: 90px 0; position: relative; }
.section-head { text-align: center; margin-bottom: 56px; }
.section-tag { display: inline-block; color: var(--primary); font-size: 13px; letter-spacing: 3px; margin-bottom: 12px; font-weight: 500; position: relative; }
.section-tag::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 100%; height: 1px; background: var(--gradient); }
.section-title {
  font-size: clamp(28px, 4vw, 40px); font-weight: 800; margin-bottom: 16px;
  background: linear-gradient(90deg, var(--text), var(--primary-2), var(--text), var(--primary-2));
  background-size: 300% 100%;
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  animation: title-flow 6s linear infinite;
}
@keyframes title-flow { 0% { background-position: 0% 50%; } 100% { background-position: 300% 50%; } }
.section-desc { color: var(--text-dim); max-width: 560px; margin: 0 auto; font-size: 16px; }

/* ============ 算力卡片 ============ */
.compute-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  transition: all 0.35s; position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: conic-gradient(from 0deg, transparent 0 340deg, rgba(34,211,238,0.6) 360deg);
  animation: rotate-border 6s linear infinite;
  opacity: 0; transition: opacity 0.4s; z-index: 0;
}
.card:hover::before { opacity: 1; }
@keyframes rotate-border { to { transform: rotate(360deg); } }
.card > * { position: relative; z-index: 1; }
.card:hover { transform: translateY(-6px); border-color: var(--primary); box-shadow: 0 16px 40px rgba(79,139,255,0.15); }
.card.featured { border-color: var(--primary); background: linear-gradient(160deg, rgba(79,139,255,0.15), var(--card-bg)); }
.gpu-card.wide { grid-column: span 2; }
.gpu-img {
  height: 180px; border-radius: 12px; overflow: hidden; margin-bottom: 20px;
  position: relative;
}
.gpu-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.card:hover .gpu-img img { transform: scale(1.08); }
.gpu-img::before {
  content: ''; position: absolute; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-2), transparent);
  z-index: 2; animation: scan 3s ease-in-out infinite; opacity: 0.8;
}
@keyframes scan { 0% { top: 0; } 50% { top: calc(100% - 2px); } 100% { top: 0; } }
.gpu-img::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(6,10,20,0.7) 100%);
}
.gpu-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.gpu-icon { font-size: 30px; }
.gpu-badge { font-size: 12px; padding: 4px 12px; border-radius: 20px; background: rgba(34,211,238,0.12); color: var(--primary-2); border: 1px solid rgba(34,211,238,0.3); }
.gpu-badge.hot { background: rgba(167,139,250,0.12); color: var(--accent); border-color: rgba(167,139,250,0.3); }
.gpu-name { font-size: 24px; font-weight: 700; margin-bottom: 6px; }
.gpu-spec { color: var(--primary-2); font-size: 14px; margin-bottom: 16px; }
.gpu-points { list-style: none; margin-bottom: 20px; }
.gpu-points li { color: var(--text-dim); font-size: 14px; padding-left: 18px; position: relative; margin-bottom: 8px; }
.gpu-points li::before { content: '▸'; position: absolute; left: 0; color: var(--primary); }
.gpu-tag { display: inline-block; font-size: 12px; color: var(--text-dim); border: 1px solid var(--border); padding: 3px 12px; border-radius: 6px; }
.gpu-duo { display: flex; gap: 32px; margin-bottom: 12px; flex-wrap: wrap; }

/* ============ Token 工厂 ============ */
.token-section { background: linear-gradient(180deg, var(--bg), var(--bg-2)); }
.model-library {
  max-width: 1100px; margin: 0 auto 48px;
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
}
.library-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.library-badge {
  font-size: 16px; font-weight: 700; color: var(--text);
}
.library-note { font-size: 13px; color: var(--primary-2); }
.library-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.l-chip {
  display: flex; flex-direction: column; gap: 4px;
  padding: 18px 20px; border-radius: 12px;
  background: rgba(79,139,255,0.06); border: 1px solid var(--border);
  transition: all 0.3s;
}
.l-chip:hover { border-color: var(--primary); transform: translateY(-2px); }
.l-chip strong { font-size: 17px; color: var(--text); }
.l-chip span { font-size: 13px; color: var(--text-dim); }
.l-chip.more {
  align-items: center; justify-content: center; color: var(--primary-2);
  font-size: 15px; font-weight: 500; border-style: dashed;
}
@media (max-width: 768px) {
  .library-grid { grid-template-columns: repeat(2, 1fr); }
}
.token-pipeline { display: flex; align-items: stretch; justify-content: center; gap: 12px; flex-wrap: wrap; margin-bottom: 40px; }
.token-stage {
  flex: 1; min-width: 200px; max-width: 240px;
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px 20px; text-align: center;
  transition: all 0.3s;
}
.token-stage:hover { border-color: var(--primary); transform: translateY(-4px); }
.token-stage { animation: stage-in 0.8s ease both; }
.token-stage:nth-child(1) { animation-delay: 0s; }
.token-stage:nth-child(3) { animation-delay: 0.15s; }
.token-stage:nth-child(5) { animation-delay: 0.3s; }
.token-stage:nth-child(7) { animation-delay: 0.45s; }
@keyframes stage-in { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.stage-num { font-size: 30px; font-weight: 900; background: var(--gradient); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.token-stage h3 { font-size: 18px; margin: 10px 0 8px; }
.token-stage p { color: var(--text-dim); font-size: 13px; }
.token-arrow { display: flex; align-items: center; color: var(--primary); font-size: 24px; animation: arrow-move 1.2s ease-in-out infinite; }
@keyframes arrow-move { 0%,100% { transform: translateX(0); opacity: 0.5; } 50% { transform: translateX(6px); opacity: 1; } }
.token-features { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.t-feature {
  padding: 10px 20px; border-radius: 30px;
  background: rgba(79,139,255,0.08); border: 1px solid var(--border);
  color: var(--text); font-size: 14px;
}

/* ============ 3+N 模式 ============ */
.model-section { background: var(--bg-2); }
.model-diagram { margin-bottom: 16px; }
.core-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 900px; margin: 0 auto 40px; }
.core-item {
  text-align: center; padding: 36px 20px;
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); transition: all 0.3s; position: relative; overflow: hidden;
}
.core-item::before {
  content: ''; position: absolute; top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: conic-gradient(from 0deg, transparent 0 340deg, rgba(167,139,250,0.5) 360deg);
  animation: rotate-border 6s linear infinite;
  opacity: 0; transition: opacity 0.4s; z-index: 0;
}
.core-item:hover::before { opacity: 1; }
.core-item > * { position: relative; z-index: 1; }
.core-item:hover { border-color: var(--primary); transform: translateY(-4px); }
.core-icon { font-size: 40px; margin-bottom: 16px; display: block; }
.core-item h3 { font-size: 20px; margin-bottom: 8px; }
.core-item p { color: var(--text-dim); font-size: 14px; }
.model-center { text-align: center; margin: 0 auto 40px; display: flex; align-items: center; justify-content: center; gap: 20px; }
.mc-label { font-size: 20px; font-weight: 700; color: var(--text); }
.mc-plus { font-size: 36px; font-weight: 900; color: var(--primary); }
.industry-cloud { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; max-width: 800px; margin: 0 auto 56px; }
.i-chip {
  padding: 10px 22px; border-radius: 30px; font-size: 14px;
  background: rgba(79,139,255,0.08); border: 1px solid var(--border);
  color: var(--text); transition: all 0.3s; cursor: default;
}
.i-chip:hover { background: var(--gradient); color: #fff; transform: scale(1.05); }
.model-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.m-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; border-top: 3px solid var(--primary); }
.m-card h4 { font-size: 18px; margin-bottom: 10px; }
.m-card p { color: var(--text-dim); font-size: 14px; }

/* ============ 行业 ============ */
.industry-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.i-card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 0 0 20px; text-align: center;
  overflow: hidden; transition: all 0.3s; position: relative;
}
.i-card::before {
  content: ''; position: absolute; top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: conic-gradient(from 0deg, transparent 0 340deg, rgba(34,211,238,0.5) 360deg);
  animation: rotate-border 6s linear infinite;
  opacity: 0; transition: opacity 0.4s; z-index: 0;
}
.i-card:hover::before { opacity: 1; }
.i-card > * { position: relative; z-index: 1; }
.i-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: 0 12px 30px rgba(79,139,255,0.12); }
.i-img { position: relative; height: 130px; overflow: hidden; margin-bottom: 16px; }
.i-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.i-card:hover .i-img img { transform: scale(1.1); }
.i-img::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(6,10,20,0.85) 100%);
}
.i-icon {
  position: absolute; left: 50%; transform: translateX(-50%); bottom: -12px;
  font-size: 30px; z-index: 2; display: block;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.5));
}
.i-img-empty {
  background: linear-gradient(135deg, rgba(79,139,255,0.15), rgba(167,139,250,0.15));
  border-bottom: 1px solid var(--border);
}
.i-img-empty::after { background: none; }
.i-img-empty .i-icon {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  font-size: 42px; bottom: auto;
}
.i-card h4 { font-size: 17px; margin-bottom: 6px; }
.i-card p { color: var(--text-dim); font-size: 13px; }

/* ============ 解决方案 ============ */
.solution-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.sol-card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 0 32px 28px; position: relative;
  overflow: hidden; transition: all 0.3s;
}
.sol-card::before {
  content: ''; position: absolute; top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: conic-gradient(from 0deg, transparent 0 340deg, rgba(34,211,238,0.5) 360deg);
  animation: rotate-border 6s linear infinite;
  opacity: 0; transition: opacity 0.4s; z-index: 0;
}
.sol-card:hover::before { opacity: 1; }
.sol-card > * { position: relative; z-index: 1; }
.sol-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.sol-img { height: 140px; margin: 0 -32px 20px; overflow: hidden; position: relative; }
.sol-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.sol-card:hover .sol-img img { transform: scale(1.08); }
.sol-img::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(6,10,20,0.8) 100%);
}
.sol-num { font-size: 44px; font-weight: 900; color: var(--primary); position: relative; margin: -6px 0 4px; display: inline-block; }
.sol-card h3 { font-size: 20px; margin-bottom: 12px; }
.sol-card p { color: var(--text-dim); font-size: 14px; margin-bottom: 16px; }
.sol-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.sol-tags span { font-size: 12px; padding: 4px 12px; border-radius: 6px; background: rgba(79,139,255,0.1); color: var(--primary-2); }

/* ============ CTA ============ */
.cta { padding: 80px 0; position: relative; overflow: hidden; }
.cta-bg { position: absolute; inset: 0; z-index: 0; }
.cta-bg img { width: 100%; height: 100%; object-fit: cover; }
.cta-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(6,10,20,0.9), rgba(10,20,40,0.85));
}
.cta-inner {
  position: relative; z-index: 1;
  text-align: center; padding: 60px 24px;
  background: linear-gradient(135deg, rgba(79,139,255,0.15), rgba(34,211,238,0.1));
  border: 1px solid var(--border); border-radius: 24px;
}
.cta-inner h2 { font-size: clamp(26px, 4vw, 38px); font-weight: 800; margin-bottom: 12px; }
.cta-inner p { color: var(--text-dim); margin-bottom: 28px; }

/* ============ 联系 ============ */
.contact-section { background: var(--bg-2); }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: start; }
.contact-info .section-title { text-align: left; }
.contact-info > p { color: var(--text-dim); margin-bottom: 32px; }
.c-item { display: flex; gap: 16px; margin-bottom: 24px; align-items: flex-start; }
.c-icon { font-size: 24px; }
.c-item h4 { font-size: 15px; margin-bottom: 2px; }
.c-item p { color: var(--text-dim); font-size: 14px; }
.contact-form {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px;
  display: flex; flex-direction: column; gap: 16px;
}
.contact-form h3 { font-size: 22px; margin-bottom: 4px; }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%; padding: 13px 16px; border-radius: 10px;
  background: rgba(6,10,20,0.6); border: 1px solid var(--border);
  color: var(--text); font-family: inherit; font-size: 14px;
  transition: border-color 0.3s;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--primary);
}
.contact-form textarea { resize: vertical; }
.contact-form select { appearance: none; }
.contact-form select option { background: var(--bg-3); }
.form-msg { text-align: center; color: var(--primary-2); font-size: 14px; min-height: 20px; }

/* ============ 页脚 ============ */
.footer { border-top: 1px solid var(--border); padding: 40px 0; background: var(--bg); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand .logo-mark { width: 36px; height: 36px; font-size: 18px; }
.footer-brand p { color: var(--text-dim); font-size: 14px; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a { color: var(--text-dim); text-decoration: none; font-size: 14px; transition: color 0.3s; }
.footer-links a:hover { color: var(--primary-2); }
.copyright { color: var(--text-dim); font-size: 13px; width: 100%; text-align: center; margin-top: 8px; }
.copyright a { color: inherit; text-decoration: none; }

/* ============ 入场动画 ============ */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.revealed { opacity: 1; transform: translateY(0); }

/* ============ 回到顶部 ============ */
.back-top {
  position: fixed; bottom: 30px; right: 30px; z-index: 150;
  width: 48px; height: 48px; border-radius: 12px; border: none; cursor: pointer;
  background: var(--gradient); color: #fff; font-size: 22px; font-weight: 700;
  box-shadow: 0 6px 20px rgba(79,139,255,0.4);
  opacity: 0; visibility: hidden; transform: translateY(20px);
  transition: all 0.4s;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { transform: translateY(-4px); box-shadow: 0 10px 30px rgba(79,139,255,0.6); }

/* ============ 响应式 ============ */
@media (max-width: 992px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .compute-grid, .solution-grid { grid-template-columns: 1fr; }
  .gpu-card.wide { grid-column: span 1; }
  .core-3, .model-cards { grid-template-columns: 1fr; }
  .industry-grid { grid-template-columns: repeat(3, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .token-arrow { transform: rotate(90deg); }
}
@media (max-width: 768px) {
  .nav-menu {
    position: fixed; top: 0; right: -100%; height: 100vh; width: 70%; max-width: 320px;
    background: rgba(6,10,20,0.98); flex-direction: column; justify-content: center;
    gap: 24px; padding: 40px; transition: right 0.4s; border-left: 1px solid var(--border);
  }
  .nav-menu.open { right: 0; }
  .nav-toggle { display: flex; z-index: 110; }
  .nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 38px; }
  .cluster-orbit { transform: scale(0.85); }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .industry-grid { grid-template-columns: 1fr 1fr; }
  .token-pipeline { flex-direction: column; align-items: center; }
  .token-stage { max-width: 100%; width: 100%; }
}