/* Reset & Base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: #F7F8FA;
  color: #1a1a2e;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 60px;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, #22D3EE, #06B6D4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: #FFF;
}
.logo-text {
  font-size: 22px;
  font-weight: 700;
  color: #06B6D4;
  letter-spacing: -0.5px;
}
.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-link {
  font-size: 15px;
  color: #666;
  transition: color 0.2s;
}
.nav-link:hover { color: #06B6D4; }
.nav-link.active { color: #06B6D4; font-weight: 600; }

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 10px;
  background: linear-gradient(135deg, #22D3EE, #06B6D4);
  color: #FFF;
  font-size: 14px;
  font-weight: 600;
  transition: opacity 0.2s, transform 0.2s, box-shadow 0.2s;
  border: none;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(6,182,212,0.25);
}
.btn-primary:hover { opacity: 0.92; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(6,182,212,0.3); }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 10px;
  background: #FFF;
  border: 1px solid #E5E7EB;
  color: #555;
  font-size: 14px;
  transition: background 0.2s, border-color 0.2s;
  cursor: pointer;
}
.btn-ghost:hover { background: #F9FAFB; border-color: #D1D5DB; }
.btn-lg { padding: 14px 36px; font-size: 16px; border-radius: 12px; }

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 100px 120px 80px;
  display: flex;
  justify-content: center;
  background: #FFFFFF;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(34,211,238,0.08), transparent 70%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  max-width: 800px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: 20px;
  background: rgba(6,182,212,0.08);
  border: 1px solid rgba(6,182,212,0.15);
  font-size: 13px;
  color: #06B6D4;
  font-weight: 500;
}
.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #06B6D4;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero h1 {
  font-size: clamp(32px, 3.5vw, 48px);
  font-weight: 700;
  letter-spacing: -1.5px;
  text-align: center;
  line-height: 1.25;
  color: #1a1a2e;
}
.hero-sub {
  font-size: clamp(15px, 1.3vw, 18px);
  color: #888;
  text-align: center;
  max-width: 600px;
  line-height: 1.7;
}
.hero-ctas {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-top: 8px;
}

/* Value Props */
.value-props {
  display: flex;
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 80px 60px;
}
.value-card {
  flex: 1;
  padding: 26px 24px;
  border-radius: 14px;
  background: #FFFFFF;
  border: 1px solid #F0F0F0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: center;
  align-items: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}
.value-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.value-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: #1a1a2e;
}
.value-card p {
  font-size: 13px;
  color: #888;
  line-height: 1.65;
}

/* Model Matrix */
.models {
  padding: 20px 80px 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
}
.models > div:first-child {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.models-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  width: 100%;
  max-width: 1100px;
}
.model-card {
  padding: 24px;
  border-radius: 14px;
  background: #FFFFFF;
  border: 1px solid #F0F0F0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  transition: box-shadow 0.3s, border-color 0.3s, transform 0.3s;
}
.model-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  border-color: #E0E0E0;
  transform: translateY(-3px);
}
.model-cat {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 12px;
  background: rgba(6,182,212,0.08);
  color: #06B6D4;
  font-size: 12px;
  font-weight: 600;
  align-self: flex-start;
}
.model-names {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}
.model-name {
  font-size: 16px;
  font-weight: 600;
  color: #1a1a2e;
  line-height: 1.4;
}
.model-hint {
  display: inline-block;
  margin-left: 6px;
  padding: 2px 8px;
  border-radius: 8px;
  background: rgba(16,185,129,0.1);
  color: #10B981;
  font-size: 11px;
  font-weight: 600;
  vertical-align: middle;
}
.official-mark {
  font-size: 12px;
  color: #10B981;
  display: flex;
  align-items: center;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid #F5F5F5;
  font-weight: 600;
}

/* Spotlight Feature */
.spotlight {
  padding: 10px 80px 60px;
  display: flex;
  justify-content: center;
}
.spotlight-card {
  max-width: 1100px;
  width: 100%;
  padding: 56px 60px;
  border-radius: 20px;
  background: linear-gradient(135deg, #0c1626 0%, #142948 60%, #0c1626 100%);
  color: #FFF;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(12,22,38,0.2);
}
.spotlight-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 90% at 85% 20%, rgba(34,211,238,0.22), transparent 60%);
  pointer-events: none;
}
.spotlight-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 80% at 10% 90%, rgba(139,92,246,0.15), transparent 60%);
  pointer-events: none;
}
.spotlight-content {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-width: 680px;
}
.spotlight-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 16px;
  background: rgba(34,211,238,0.12);
  color: #22D3EE;
  font-size: 12px;
  font-weight: 600;
  align-self: flex-start;
  border: 1px solid rgba(34,211,238,0.3);
  letter-spacing: 0.5px;
}
.spotlight-card h2 {
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1.2;
  color: #FFF;
}
.spotlight-tagline {
  font-size: clamp(16px, 1.6vw, 20px);
  color: #22D3EE;
  font-weight: 600;
  letter-spacing: -0.3px;
}
.spotlight-desc {
  font-size: 15px;
  color: rgba(255,255,255,0.72);
  line-height: 1.8;
}
.spotlight-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}
.spotlight-tags span {
  padding: 6px 14px;
  border-radius: 12px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  font-size: 13px;
  color: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
}

/* Features */
.features {
  padding: 70px 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}
.section-title {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  text-align: center;
  color: #1a1a2e;
}
.section-sub {
  font-size: 16px;
  color: #888;
  text-align: center;
  max-width: 640px;
  line-height: 1.7;
}
.features .section-sub { margin-top: -24px; }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  width: 100%;
  max-width: 1100px;
}
.feature-card {
  padding: 28px;
  border-radius: 16px;
  background: #FFFFFF;
  border: 1px solid #F0F0F0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: box-shadow 0.3s, transform 0.3s, border-color 0.3s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.feature-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  border-color: #E0E0E0;
  transform: translateY(-3px);
}
.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.feature-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: #1a1a2e;
}
.feature-card p {
  font-size: 14px;
  color: #999;
  line-height: 1.6;
}

/* CTA Section */
.cta-section {
  padding: 70px 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  background: #FFFFFF;
  border-top: 1px solid #F0F0F0;
}
.cta-section h2 {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: #1a1a2e;
}
.cta-section p {
  font-size: 16px;
  color: #999;
}

/* Footer */
.footer {
  position: sticky;
  bottom: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 60px;
  border-top: 1px solid rgba(0,0,0,0.06);
  font-size: 13px;
  color: #888;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(20px);
}
.footer-left, .footer-contact {
  display: flex;
  align-items: center;
  gap: 16px;
}
.footer a { color: #888; transition: color 0.2s; }
.footer a:hover { color: #06B6D4; }

/* Responsive */
@media (max-width: 1024px) {
  .header { padding: 14px 32px; }
  .hero { padding: 70px 40px 50px; }
  .value-props { padding: 20px 32px 50px; }
  .models { padding: 16px 32px 50px; }
  .models-grid { grid-template-columns: repeat(2, 1fr); }
  .spotlight { padding: 8px 32px 50px; }
  .spotlight-card { padding: 44px 40px; }
  .features { padding: 50px 32px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .cta-section { padding: 50px 32px; }
}
@media (max-width: 640px) {
  .header { padding: 12px 20px; }
  .nav { gap: 12px; }
  .hero { padding: 50px 20px 36px; }
  .hero-ctas { flex-direction: column; width: 100%; }
  .hero-ctas .btn-lg { width: 100%; justify-content: center; }
  .value-props { flex-direction: column; padding: 12px 16px 32px; }
  .models { padding: 8px 16px 36px; gap: 24px; }
  .models-grid { grid-template-columns: 1fr; }
  .spotlight { padding: 4px 16px 36px; }
  .spotlight-card { padding: 32px 24px; border-radius: 16px; }
  .features { padding: 36px 16px; }
  .features-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 24px; }
  .cta-section { padding: 36px 20px; }
  .cta-section h2 { font-size: 22px; }
  .footer { padding: 16px 20px; flex-direction: column; gap: 10px; }
  .footer-left, .footer-contact { flex-wrap: wrap; justify-content: center; gap: 8px; }
}