/* ========== GPU产品单页专属样式 ========== */
:root {
  --primary: #1a3c7a;
  --primary-light: #2a5cba;
  --accent: #00d4ff;
  --accent-glow: rgba(0,212,255,0.3);
  --dark: #0a1628;
  --dark-card: #111f3a;
  --text: #e0e8f5;
  --text-muted: #8fa8c8;
  --gold: #ffb800;
  --green: #00e676;
  --gradient-hero: linear-gradient(135deg, #0a1628 0%, #1a3c7a 50%, #0d2547 100%);
  --gradient-card: linear-gradient(145deg, #13294b 0%, #0f1f3d 100%);
  --gradient-btn: linear-gradient(135deg, #00d4ff 0%, #0090d9 100%);
  --gradient-gold: linear-gradient(135deg, #ffb800 0%, #ff8c00 100%);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px rgba(0,212,255,0.15);
}

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

body {
  min-width: 0;
  font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
  background: var(--dark) !important;
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.6;
}

/* ---------- Hero区 ---------- */
.hero {
  min-height: 100vh;
  background: var(--gradient-hero);
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding: 120px 20px 80px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content:''; position:absolute; top:-50%; left:-50%;
  width:200%; height:200%;
  background: radial-gradient(ellipse at 30% 50%, rgba(0,212,255,0.06) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 30%, rgba(26,60,122,0.4) 0%, transparent 50%);
  animation: heroBg 20s ease infinite alternate;
}
@keyframes heroBg {
  0% { transform: translate(0,0) rotate(0deg); }
  100% { transform: translate(-5%,3%) rotate(3deg); }
}
.hero-particles {
  position:absolute; top:0; left:0; right:0; bottom:0;
  overflow:hidden; pointer-events:none;
}
.particle {
  position:absolute; border-radius:50%; background: var(--accent); opacity:0.15;
  animation: float linear infinite;
}
@keyframes float {
  0% { transform: translateY(100vh) scale(0); opacity:0; }
  10% { opacity:0.15; }
  90% { opacity:0.15; }
  100% { transform: translateY(-10vh) scale(1); opacity:0; }
}
.hero-content { position:relative; z-index:2; max-width:900px; }
.hero-badge {
  display:inline-block;
  background: rgba(0,212,255,0.1);
  border:1px solid rgba(0,212,255,0.3);
  color: var(--accent); font-size:13px; font-weight:600;
  padding: 6px 18px; border-radius:20px;
  margin-bottom: 24px;
  letter-spacing: 1px;
}
.hero h1 {
  font-size: 52px; font-weight: 800; color:#fff;
  line-height: 1.2; margin-bottom: 16px;
  text-shadow: 0 0 60px rgba(0,212,255,0.2);
}
.hero h1 .highlight {
  background: linear-gradient(90deg, var(--accent), #00ff88);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 20px; color: var(--text-muted); margin-bottom: 40px;
  line-height: 1.8;
}
.hero-price {
  display: inline-flex; align-items: baseline; gap: 8px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.25);
  padding: 16px 36px;
  border-radius: 16px;
  margin-bottom: 40px;
  backdrop-filter: blur(10px);
}
.hero-price .price-label { font-size:15px; color: var(--text-muted); }
.hero-price .price-val {
  font-size: 48px; font-weight: 900; color: var(--accent);
  text-shadow: 0 0 30px rgba(0,212,255,0.4);
}
.hero-price .price-unit { font-size:16px; color: var(--text-muted); }
.hero-actions { display:flex; gap:16px; justify-content:center; flex-wrap:wrap; }
.hero-actions .btn-primary {
  background: var(--gradient-btn);
  color:#fff; text-decoration:none; font-size:17px; font-weight:700;
  padding: 16px 48px; border-radius:10px;
  box-shadow: 0 8px 30px rgba(0,212,255,0.35);
  transition: .25s;
  display: inline-flex; align-items: center; gap: 8px;
}
.hero-actions .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0,212,255,0.5);
}
.hero-actions .btn-secondary {
  background: transparent;
  color: var(--accent); text-decoration:none; font-size:16px; font-weight:600;
  padding: 15px 40px; border-radius:10px;
  border: 1px solid rgba(0,212,255,0.35);
  transition: .25s;
}
.hero-actions .btn-secondary:hover {
  background: rgba(0,212,255,0.08);
  border-color: var(--accent);
}

/* ---------- GPU 3D Card ---------- */
.gpu-visual {
  margin-top: 60px;
  perspective: 1000px;
}
.gpu-card-3d {
  width: 420px; height: 260px;
  margin: 0 auto;
  background: linear-gradient(145deg, #1a3c7a 0%, #0d2547 100%);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: 20px;
  transform: rotateX(8deg);
  box-shadow: 0 40px 80px rgba(0,0,0,0.5), 0 0 60px rgba(0,212,255,0.1);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 16px;
  position: relative;
  overflow: hidden;
}
.gpu-card-3d::before {
  content:''; position:absolute; top:0; left:0; right:0; bottom:0;
  background: radial-gradient(circle at 50% 0%, rgba(0,212,255,0.15) 0%, transparent 70%);
}
.gpu-card-3d .gpu-icon {
  font-size: 64px;
  filter: drop-shadow(0 0 20px rgba(0,212,255,0.5));
  animation: pulse 2s ease infinite;
}
@keyframes pulse {
  0%,100% { filter: drop-shadow(0 0 20px rgba(0,212,255,0.5)); }
  50% { filter: drop-shadow(0 0 35px rgba(0,212,255,0.8)); }
}
.gpu-card-3d .gpu-label {
  font-size: 22px; font-weight: 700; color:#fff; z-index:1;
}
.gpu-card-3d .gpu-sublabel {
  font-size: 13px; color: var(--accent); z-index:1; letter-spacing: 2px;
}

/* ---------- 通用区块 ---------- */
.section { padding: 100px 20px; }
.section-title {
  text-align: center; margin-bottom: 60px;
}
.section-title .tag {
  display:inline-block; font-size:13px; color: var(--accent);
  background: rgba(0,212,255,0.1); border:1px solid rgba(0,212,255,0.25);
  padding: 4px 14px; border-radius:12px; margin-bottom:12px;
  letter-spacing: 1px;
}
.section-title h2 {
  font-size: 36px; font-weight: 800; color:#fff; margin-bottom:12px;
}
.section-title p { font-size:16px; color: var(--text-muted); max-width:600px; margin:0 auto; }
.container { max-width:1200px; margin:0 auto; }

/* ---------- 核心亮点 ---------- */
.features-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.feature-card {
  background: var(--gradient-card);
  border: 1px solid rgba(0,212,255,0.12);
  border-radius: 16px;
  padding: 36px 24px;
  text-align: center;
  transition: .3s;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content:''; position:absolute; top:0; left:0; right:0;
  height:3px; background: var(--gradient-btn);
  transform: scaleX(0); transition: transform .3s;
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(0,212,255,0.25);
}
.feature-card .icon {
  font-size: 42px; margin-bottom: 18px;
  display: block;
}
.feature-card h3 { font-size:18px; color:#fff; margin-bottom:10px; }
.feature-card p { font-size:14px; color: var(--text-muted); line-height:1.7; }

/* ---------- 硬件规格 ---------- */
.spec-section { background: rgba(0,10,25,0.5); }
.spec-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px;
}
.spec-item {
  background: var(--gradient-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 24px;
  display: flex; align-items: flex-start; gap: 16px;
  transition: .25s;
}
.spec-item:hover {
  border-color: rgba(0,212,255,0.2);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.spec-item .spec-icon {
  width: 48px; height: 48px; border-radius:12px;
  background: rgba(0,212,255,0.1);
  display: flex; align-items:center; justify-content:center;
  font-size: 22px; flex-shrink: 0;
}
.spec-item .spec-info h4 {
  font-size: 15px; color: var(--text-muted); font-weight: 500; margin-bottom: 4px;
}
.spec-item .spec-info .spec-val {
  font-size: 18px; color:#fff; font-weight: 700;
}
.spec-item .spec-info .spec-detail {
  font-size: 13px; color: var(--text-muted); margin-top: 4px;
}

/* ---------- 适用场景 ---------- */
.scenarios-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.scenario-card {
  background: var(--gradient-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 30px 24px;
  transition: .3s;
}
.scenario-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0,212,255,0.2);
  box-shadow: var(--shadow-glow);
}
.scenario-card .s-icon {
  font-size: 36px; margin-bottom: 16px;
}
.scenario-card h3 { font-size:17px; color:#fff; margin-bottom:8px; }
.scenario-card p { font-size:14px; color: var(--text-muted); line-height:1.7; }
.scenario-card ul {
  list-style: none; margin-top: 12px;
}
.scenario-card ul li {
  font-size:13px; color: var(--text-muted); padding: 4px 0;
  padding-left: 18px; position: relative;
}
.scenario-card ul li::before {
  content:'▸'; position:absolute; left:0; color: var(--accent);
}

/* ---------- 为什么选择 ---------- */
.choose-section { background: rgba(0,10,25,0.5); }
.choose-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.choose-item {
  text-align: center;
  padding: 30px 20px;
}
.choose-item .c-icon {
  width: 64px; height: 64px; border-radius:50%;
  background: rgba(0,212,255,0.1);
  display: inline-flex; align-items:center; justify-content:center;
  font-size: 28px; margin-bottom: 16px;
  border: 2px solid rgba(0,212,255,0.2);
  transition: .3s;
}
.choose-item:hover .c-icon {
  background: rgba(0,212,255,0.2);
  box-shadow: 0 0 30px rgba(0,212,255,0.3);
}
.choose-item h3 { font-size:16px; color:#fff; margin-bottom:8px; }
.choose-item p { font-size:13px; color: var(--text-muted); line-height:1.7; }

/* ---------- CTA 区域 ---------- */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, #0d2547 100%);
  padding: 80px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content:''; position:absolute; top:0; left:0; right:0; bottom:0;
  background: radial-gradient(circle at 50% 50%, rgba(0,212,255,0.08) 0%, transparent 70%);
}
.cta-section h2 { font-size:36px; color:#fff; margin-bottom:12px; position:relative; }
.cta-section p { font-size:17px; color: var(--text-muted); margin-bottom:36px; position:relative; }
.cta-btns { display:flex; gap:16px; justify-content:center; flex-wrap:wrap; position:relative; }
.cta-btns .btn-cta {
  background: var(--gradient-gold);
  color:#1a1a0a; text-decoration:none; font-size:17px; font-weight:700;
  padding: 16px 48px; border-radius:10px;
  box-shadow: 0 8px 30px rgba(255,184,0,0.35);
  transition: .25s;
}
.cta-btns .btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(255,184,0,0.5);
}
.cta-btns .btn-cta-outline {
  background: transparent;
  color: var(--accent); text-decoration:none; font-size:16px; font-weight:600;
  padding: 15px 40px; border-radius:10px;
  border: 1px solid rgba(0,212,255,0.35);
  transition: .25s;
}
.cta-btns .btn-cta-outline:hover {
  background: rgba(0,212,255,0.08);
}

/* ---------- 页脚 ---------- */
.gpu-footer {
  background: #060e1b;
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 60px 20px 30px;
}
.footer-inner {
  max-width:1200px; margin:0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
}
.footer-brand .brand-name {
  font-size:22px; font-weight:700; color:#fff; margin-bottom:12px;
}
.footer-brand p { font-size:13px; color: var(--text-muted); line-height:1.8; }
.footer-col h4 {
  font-size:15px; color:#fff; margin-bottom:14px; font-weight:600;
}
.footer-col a {
  display:block; color: var(--text-muted); text-decoration:none;
  font-size:13px; padding:4px 0; transition: .2s;
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  max-width:1200px; margin:30px auto 0;
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 20px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 10px;
}
.footer-bottom p { font-size:12px; color: var(--text-muted); }
.footer-bottom a { color: var(--text-muted); text-decoration:none; font-size:12px; margin-left:16px; }
.footer-bottom a:hover { color: var(--accent); }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed; bottom: 30px; right: 30px;
  width: 48px; height: 48px; border-radius:50%;
  background: var(--primary); border:1px solid rgba(0,212,255,0.3);
  color: var(--accent); font-size:22px;
  display:none; align-items:center; justify-content:center;
  cursor:pointer; z-index:999;
  transition: .25s; box-shadow: 0 4px 15px rgba(0,0,0,0.4);
}
.back-top:hover { background: var(--primary-light); transform: translateY(-2px); }
.back-top.show { display:flex; }

/* ---------- 响应式 ---------- */
@media (max-width:1024px) {
  .features-grid { grid-template-columns: repeat(2,1fr); }
  .spec-grid { grid-template-columns: 1fr; }
  .scenarios-grid { grid-template-columns: repeat(2,1fr); }
  .choose-grid { grid-template-columns: repeat(2,1fr); }
  .footer-inner { grid-template-columns: repeat(2,1fr); }
}
@media (max-width:640px) {
  .hero h1 { font-size:32px; }
  .hero-price .price-val { font-size:36px; }
  .features-grid { grid-template-columns: 1fr; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .choose-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .gpu-nav { padding:0 16px; }
  .gpu-nav .nav-links { display:none; }
  .section-title h2 { font-size:28px; }
  .gpu-card-3d { width:320px; height:200px; }
}