/* ============================================
   ZOSIM · AI 智能算力平台
   ============================================ */

:root {
  /* Primary palette */
  --primary: #1E63C4;
  --primary-light: #2E7CE0;
  --primary-dark: #124A94;
  --primary-darker: #0A3575;

  /* Accent */
  --accent: #4FA3FF;
  --accent-cyan: #22D3EE;

  /* Neutrals */
  --white: #ffffff;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;
  --gray-950: #020617;

  /* Semantic */
  --success: #10B981;
  --warning: #F59E0B;
  --error: #EF4444;

  /* Gradients */
  --grad-primary: linear-gradient(180deg, #2E7CE0 0%, #1E63C4 50%, #124A94 100%);
  --grad-hero: linear-gradient(135deg, #0A3575 0%, #124A94 35%, #1E63C4 70%, #2E7CE0 100%);
  --grad-cta: linear-gradient(135deg, #0A3575 0%, #1E63C4 50%, #2E7CE0 100%);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.1), 0 2px 4px -2px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -4px rgba(15, 23, 42, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.1);
  --shadow-blue: 0 10px 40px -10px rgba(30, 99, 196, 0.4);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;

  /* Layout */
  --container: 1200px;
  --nav-height: 72px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-700);
  background: var(--white);
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: all 0.2s ease; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

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

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  line-height: 1;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}
.btn-lg { padding: 14px 28px; font-size: 15px; }
.btn-xl { padding: 18px 36px; font-size: 17px; border-radius: var(--radius-md); }
.btn-block { display: flex; width: 100%; }

.btn-primary {
  background: var(--grad-primary);
  color: var(--white);
  box-shadow: 0 4px 14px -4px rgba(30, 99, 196, 0.5);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -4px rgba(30, 99, 196, 0.6);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: var(--white);
}

.btn-ghost {
  background: transparent;
  color: var(--gray-700);
}
.btn-ghost:hover { color: var(--primary); }

.btn-white {
  background: var(--white);
  color: var(--primary);
  box-shadow: 0 4px 14px -4px rgba(0, 0, 0, 0.2);
}
.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.25);
}

.btn-outline-white {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.6);
}
.btn-outline-white:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--white);
}

/* ===== NAV ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}
.nav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--gray-200);
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}
.nav-logo { display: flex; align-items: center; }
.logo-svg { height: 36px; width: auto; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  position: relative;
}
.nav-links a:hover { color: var(--primary); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all 0.3s ease;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 120px;
  background: var(--grad-hero);
  color: var(--white);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-grid {
  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: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}
.hero-glow-1 {
  width: 500px; height: 500px;
  top: -100px; right: -100px;
  background: var(--accent);
}
.hero-glow-2 {
  width: 400px; height: 400px;
  bottom: 50px; left: -100px;
  background: var(--accent-cyan);
  opacity: 0.25;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 60px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: rgba(255, 255, 255, 0.8);
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 100px;
  margin-bottom: 28px;
}
.eyebrow .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 24px;
  text-wrap: pretty;
}
.gradient-text {
  background: linear-gradient(90deg, #7DD3FC 0%, #4FA3FF 50%, #A5B4FC 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-style: italic;
}

.hero-sub {
  font-size: 18px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  max-width: 560px;
  margin-bottom: 40px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat-num {
  font-size: 32px;
  font-weight: 800;
  font-style: italic;
  letter-spacing: -0.5px;
}
.stat-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.65);
}
.stat-divider {
  width: 1px;
  height: 48px;
  background: rgba(255, 255, 255, 0.2);
}

/* GPU Card Visual */
.hero-visual {
  display: flex;
  justify-content: center;
}
.gpu-card {
  width: 100%;
  max-width: 440px;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.5);
  transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
  transition: transform 0.5s ease;
}
.gpu-card:hover {
  transform: perspective(1000px) rotateY(-2deg) rotateX(1deg);
}

.gpu-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.gpu-dot {
  width: 11px; height: 11px;
  border-radius: 50%;
}
.gpu-dot-1 { background: #FF5F57; }
.gpu-dot-2 { background: #FEBC2E; }
.gpu-dot-3 { background: #28C840; }
.gpu-title {
  margin-left: auto;
  font-size: 12px;
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.5px;
}

.gpu-card-body { padding: 22px; }

.gpu-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 13.5px;
}
.gpu-row:last-of-type { border-bottom: none; }
.gpu-key {
  color: rgba(255, 255, 255, 0.5);
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.gpu-val {
  color: rgba(255, 255, 255, 0.92);
  font-weight: 500;
}
.gpu-val.active {
  color: #34D399;
  display: flex;
  align-items: center;
  gap: 6px;
}
.gpu-val.active::before {
  content: '';
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #34D399;
  box-shadow: 0 0 8px #34D399;
  animation: pulse 2s ease-in-out infinite;
}

.gpu-usage {
  margin-top: 18px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.06);
}
.usage-label {
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  margin-bottom: 10px;
  color: rgba(255, 255, 255, 0.7);
}
.usage-label span:last-child {
  color: #7DD3FC;
  font-weight: 600;
  font-family: 'JetBrains Mono', 'Consolas', monospace;
}
.usage-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 100px;
  overflow: hidden;
}
.usage-fill {
  height: 100%;
  background: linear-gradient(90deg, #3B82F6, #22D3EE);
  border-radius: 100px;
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
  width: 0;
}

.gpu-train {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.train-step {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
}
.train-label {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.45);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.train-val {
  font-size: 14px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  font-family: 'JetBrains Mono', 'Consolas', monospace;
}
.train-loss { color: #FCA5A5; }

/* Marquee */
.hero-marquee {
  position: absolute;
  bottom: 0;
  left: 0; right: 0;
  padding: 20px 0;
  background: rgba(10, 53, 117, 0.3);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
}
.marquee-track {
  display: flex;
  gap: 56px;
  white-space: nowrap;
  animation: marquee 30s linear infinite;
}
.marquee-track span {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  color: rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
}
@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ===== Section Basics ===== */
.section {
  padding: 100px 0;
}
.section-alt {
  background: var(--gray-50);
}

.section-head {
  text-align: center;
  margin-bottom: 64px;
}
.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-size: 40px;
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 17px;
  color: var(--gray-500);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Product Cards ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 56px;
}
.product-card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}
.product-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-xl);
}
.product-card.featured {
  border-color: var(--primary);
  box-shadow: 0 12px 40px -12px rgba(30, 99, 196, 0.25);
  transform: scale(1.02);
}
.product-card.featured:hover {
  box-shadow: 0 20px 50px -15px rgba(30, 99, 196, 0.35);
}

.product-badge {
  position: absolute;
  top: 0;
  left: 24px;
  transform: translateY(-50%);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  background: var(--gray-100);
  color: var(--gray-600);
  border-radius: 100px;
}
.product-badge.hot {
  background: linear-gradient(90deg, #EF4444, #F97316);
  color: var(--white);
}
.product-badge.gold {
  background: linear-gradient(90deg, #D97706, #F59E0B);
  color: var(--white);
}

.product-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
}
.product-price {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--gray-100);
}
.price-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  font-style: italic;
}
.price-unit {
  font-size: 14px;
  color: var(--gray-500);
  margin-left: 4px;
}

.product-specs {
  flex: 1;
  margin-bottom: 24px;
}
.product-specs li {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 14px;
}
.spec-label { color: var(--gray-500); }
.spec-val { color: var(--gray-700); font-weight: 500; }

.product-hint {
  text-align: center;
  font-size: 12px;
  color: var(--gray-400);
  margin-top: 14px;
}

/* Value Add */
.value-add {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding: 32px;
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
}
.value-item {
  display: flex;
  align-items: center;
  gap: 16px;
}
.value-icon {
  width: 56px; height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--white);
  color: var(--primary);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}
.value-text h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 4px;
}
.value-text p {
  font-size: 13px;
  color: var(--gray-500);
}

/* ===== Solutions ===== */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.solution-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  border: 1px solid var(--gray-200);
  transition: all 0.3s ease;
}
.solution-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-lg);
}
.solution-icon {
  width: 64px; height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
}
.sol-1 { background: #EFF6FF; color: #2563EB; }
.sol-2 { background: #ECFDF5; color: #059669; }
.sol-3 { background: #FEF3C7; color: #D97706; }
.sol-4 { background: #F3E8FF; color: #7C3AED; }

.solution-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 12px;
}
.solution-card > p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 18px;
}
.sol-list li {
  font-size: 13px;
  color: var(--gray-600);
  padding: 6px 0;
  padding-left: 18px;
  position: relative;
}
.sol-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--primary-light);
}

/* ===== Features ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-item {
  padding: 36px 28px;
  border-radius: var(--radius-lg);
  background: var(--white);
  border: 1px solid var(--gray-100);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.feature-item::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.feature-item:hover::before { transform: scaleX(1); }
.feature-item:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.feature-num {
  font-size: 48px;
  font-weight: 800;
  font-style: italic;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 16px;
}
.feature-item h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}
.feature-item p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ===== Cases ===== */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.case-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1px solid var(--gray-200);
  transition: all 0.3s ease;
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-light);
}

.case-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background: #EFF6FF;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 20px;
}
.case-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 6px;
}
.case-sub {
  font-size: 14px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 18px;
}
.case-divider {
  height: 1px;
  background: var(--gray-100);
  margin-bottom: 18px;
}
.case-desc {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 24px;
}
.case-metrics {
  display: flex;
  gap: 24px;
  padding-top: 20px;
  border-top: 1px dashed var(--gray-200);
}
.case-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.metric-num {
  font-size: 24px;
  font-weight: 800;
  font-style: italic;
  color: var(--primary);
}
.metric-label {
  font-size: 12px;
  color: var(--gray-400);
}

/* ===== Promo / Pricing ===== */
.promo {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px;
  background: var(--grad-cta);
  border-radius: var(--radius-2xl);
  color: var(--white);
  position: relative;
  overflow: hidden;
}
.promo::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: var(--accent);
  filter: blur(100px);
  opacity: 0.3;
}

.promo-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 100px;
  margin-bottom: 20px;
}
.promo-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.promo-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 32px;
}

.promo-coupon {
  display: inline-flex;
  align-items: center;
  background: var(--white);
  color: var(--gray-800);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 12px 30px -8px rgba(0, 0, 0, 0.2);
}
.coupon-left {
  padding: 20px 28px;
  background: linear-gradient(135deg, #EF4444, #F97316);
  color: var(--white);
  display: flex;
  align-items: baseline;
}
.coupon-symbol { font-size: 18px; font-weight: 600; }
.coupon-amount {
  font-size: 42px;
  font-weight: 800;
  font-style: italic;
  line-height: 1;
  margin: 0 4px;
}
.coupon-unit { font-size: 16px; font-weight: 600; }
.coupon-right {
  padding: 20px 28px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.coupon-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-800);
}
.coupon-cond {
  font-size: 13px;
  color: var(--gray-500);
}

.promo-right {
  text-align: center;
  position: relative;
  z-index: 1;
}
.promo-right .btn { margin-bottom: 20px; }
.promo-note {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 24px;
}
.promo-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}
.promo-features span {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 80px 0;
  background: var(--grad-cta);
  color: var(--white);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}
.cta-inner {
  text-align: center;
  position: relative;
}
.cta-inner h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}
.cta-inner p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 36px;
}
.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Footer ===== */
.footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 72px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--gray-800);
}
.footer-brand-desc {
  font-size: 14px;
  line-height: 1.8;
  margin: 20px 0 24px;
  color: var(--gray-400);
}
.footer-logo svg { height: 40px; width: auto; }
.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}
.footer-contact-item svg { flex-shrink: 0; }

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 20px;
}
.footer-col ul li { padding: 6px 0; }
.footer-col ul li a {
  font-size: 13px;
  color: var(--gray-400);
}
.footer-col ul li a:hover { color: var(--white); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-copyright {
  font-size: 12px;
  color: var(--gray-500);
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  font-size: 12px;
  color: var(--gray-500);
}
.footer-links a:hover { color: var(--white); }

/* ===== Contact Modal ===== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.modal.active {
  opacity: 1;
  visibility: visible;
}
.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.modal-dialog {
  position: relative;
  width: 100%;
  max-width: 380px;
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
  transform: translateY(20px) scale(0.96);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}
.modal.active .modal-dialog {
  transform: translateY(0) scale(1);
}
.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 2;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  border-radius: 50%;
  transition: all 0.2s ease;
}
.modal-close:hover {
  background: var(--gray-100);
  color: var(--gray-700);
}
.modal-body {
  padding: 40px 32px 32px;
  text-align: center;
}
.modal-company {
  font-size: 13px;
  color: var(--gray-500);
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}
.modal-name {
  font-size: 26px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 12px;
}
.modal-phone {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 24px;
  padding: 8px 16px;
  background: #EFF6FF;
  border-radius: 100px;
  transition: all 0.2s ease;
}
.modal-phone:hover {
  background: #DBEAFE;
  transform: translateY(-1px);
}
.modal-qr-wrap {
  width: 220px;
  height: 220px;
  margin: 0 auto 16px;
  padding: 12px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}
.modal-qr {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.modal-hint {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--gray-500);
}
.modal-hint svg {
  color: var(--primary);
}

/* ===== Animations ===== */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.product-grid .fade-up:nth-child(1) { transition-delay: 0s; }
.product-grid .fade-up:nth-child(2) { transition-delay: 0.1s; }
.product-grid .fade-up:nth-child(3) { transition-delay: 0.2s; }
.product-grid .fade-up:nth-child(4) { transition-delay: 0.3s; }

.solution-grid .fade-up:nth-child(1) { transition-delay: 0s; }
.solution-grid .fade-up:nth-child(2) { transition-delay: 0.1s; }
.solution-grid .fade-up:nth-child(3) { transition-delay: 0.2s; }
.solution-grid .fade-up:nth-child(4) { transition-delay: 0.3s; }

.feature-grid .fade-up:nth-child(1) { transition-delay: 0s; }
.feature-grid .fade-up:nth-child(2) { transition-delay: 0.1s; }
.feature-grid .fade-up:nth-child(3) { transition-delay: 0.2s; }
.feature-grid .fade-up:nth-child(4) { transition-delay: 0.3s; }
.feature-grid .fade-up:nth-child(5) { transition-delay: 0.4s; }
.feature-grid .fade-up:nth-child(6) { transition-delay: 0.5s; }

.case-grid .fade-up:nth-child(1) { transition-delay: 0s; }
.case-grid .fade-up:nth-child(2) { transition-delay: 0.15s; }
.case-grid .fade-up:nth-child(3) { transition-delay: 0.3s; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-title { font-size: 44px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .promo { grid-template-columns: 1fr; gap: 40px; padding: 48px; }
  .section { padding: 80px 0; }
  .section-title { font-size: 32px; }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 50px;
    text-align: center;
  }
  .hero-sub { margin: 0 auto 40px; }
  .hero-cta { justify-content: center; }
  .hero-stats { justify-content: center; }
}

@media (max-width: 768px) {
  :root { --nav-height: 64px; }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    flex-direction: column;
    background: var(--white);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--gray-200);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-actions { display: none; }
  .nav-toggle { display: flex; }

  .hero {
    min-height: auto;
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 100px;
  }
  .hero-title { font-size: 36px; }
  .hero-sub { font-size: 16px; }
  .hero-stats { gap: 24px; }
  .stat-num { font-size: 26px; }
  .stat-divider { display: none; }

  .gpu-card {
    transform: none;
    max-width: 380px;
  }
  .gpu-card:hover { transform: none; }

  .section { padding: 64px 0; }
  .section-head { margin-bottom: 44px; }
  .section-title { font-size: 26px; }
  .section-desc { font-size: 15px; }

  .product-grid { grid-template-columns: 1fr; }
  .product-card.featured { transform: none; }
  .solution-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }

  .value-add {
    grid-template-columns: 1fr;
    padding: 24px;
  }

  .promo { padding: 36px 28px; }
  .promo-title { font-size: 26px; }
  .promo-coupon { flex-direction: column; width: 100%; }
  .coupon-left { justify-content: center; }
  .coupon-right { text-align: center; align-items: center; }

  .cta-section { padding: 60px 0; }
  .cta-inner h2 { font-size: 26px; }

  .footer { padding: 52px 0 24px; }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-bottom: 32px;
  }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 30px; }
  .hero-cta .btn { flex: 1; }
  .marquee-track { gap: 36px; }
  .marquee-track span { font-size: 12px; }
  .btn-xl { padding: 16px 28px; font-size: 15px; }
}