/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg-dark: #0a0a0a;
  --color-bg-light: #f5f5f7;
  --color-white: #ffffff;
  --color-text-primary: #ffffff;
  --color-text-dark: #1d1d1f;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-secondary-dark: #6e6e73;
  --color-accent: #3399ff;
  --color-accent-hover: #0077ed;
  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-dark: #d2d2d7;
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --max-width: 1200px;
  --header-height: 52px;
  --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-system);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-dark);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-img {
  height: 28px;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text-secondary);
  transition: color var(--transition);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text-primary);
}

.nav-dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding-top: 12px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
}

.dropdown-item {
  display: block;
  padding: 8px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background: rgba(30, 30, 30, 0.95);
  backdrop-filter: blur(20px);
  border-radius: 8px;
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
}

.dropdown-item:hover {
  color: var(--color-text-primary);
  background: rgba(50, 50, 50, 0.95);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-text-primary);
  transition: var(--transition);
}

/* Stats */
.section-stats {
  background: var(--color-bg-dark);
  padding: 60px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-number {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.1;
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 14px;
  color: var(--color-text-secondary);
  font-weight: 400;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--header-height) + 60px) 24px 80px;
  background: var(--color-bg-dark);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(51, 153, 255, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(51, 153, 255, 0.05) 0%, transparent 50%),
    linear-gradient(180deg, var(--color-bg-dark) 0%, #0d0d0d 100%);
  z-index: 0;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 140%;
  height: 140%;
  transform: translate(-50%, -50%);
  background: 
    repeating-linear-gradient(0deg, transparent, transparent 49px, rgba(255,255,255,0.02) 49px, rgba(255,255,255,0.02) 50px),
    repeating-linear-gradient(90deg, transparent, transparent 49px, rgba(255,255,255,0.02) 49px, rgba(255,255,255,0.02) 50px);
  z-index: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-title {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-white);
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 300;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 720px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--color-text-secondary);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 1;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--color-text-secondary) 0%, transparent 100%);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.2); }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 980px;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: scale(1.02);
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}

.btn-secondary:hover {
  background: rgba(51, 153, 255, 0.1);
}

.btn-outline-light {
  background: transparent;
  color: var(--color-white);
  border: 1.5px solid rgba(255, 255, 255, 0.3);
}

.btn-outline-light:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.05);
}

.btn-large {
  padding: 18px 48px;
  font-size: 17px;
}

/* Sections */
.section {
  padding: 120px 0;
}

.section-dark {
  background: var(--color-bg-dark);
  color: var(--color-text-primary);
}

.section-light {
  background: var(--color-bg-light);
  color: var(--color-text-dark);
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 64px;
}

.section-title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
}

.section-title-dark {
  color: var(--color-text-dark);
}

.section-desc {
  font-size: 17px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.section-desc-dark {
  color: var(--color-text-secondary-dark);
}

.section-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 48px;
  flex-wrap: wrap;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 40px 28px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  text-align: center;
  transition: all var(--transition);
}

.feature-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-4px);
}

.feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 24px;
  color: var(--color-accent);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-white);
}

.feature-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* Why Grid */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.why-card {
  padding: 40px 32px;
  background: var(--color-white);
  border-radius: 20px;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.why-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

.why-number {
  font-size: 48px;
  font-weight: 700;
  color: rgba(51, 153, 255, 0.12);
  line-height: 1;
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}

.why-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: 12px;
  line-height: 1.3;
}

.why-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary-dark);
}

/* Capabilities */
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.capability-card {
  text-align: center;
  padding: 48px 32px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: all var(--transition);
}

.capability-card:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(51, 153, 255, 0.3);
}

.capability-visual {
  margin-bottom: 32px;
}

.capability-icon-wrap {
  width: 80px;
  height: 80px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.capability-icon-wrap svg {
  width: 100%;
  height: 100%;
}

.capability-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-white);
}

.capability-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* Partners */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.partner-card {
  padding: 48px 40px;
  background: var(--color-white);
  border-radius: 20px;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
  text-align: center;
  transition: all var(--transition);
}

.partner-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

.partner-logo {
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.partner-logo img {
  max-height: 100%;
  max-width: 160px;
  object-fit: contain;
}

.partner-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: 16px;
}

.partner-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary-dark);
}

/* CTA */
.section-cta {
  background: linear-gradient(180deg, var(--color-bg-dark) 0%, #0d1117 100%);
  padding: 120px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.section-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 800px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-white);
  margin-bottom: 20px;
}

.cta-desc {
  font-size: 18px;
  font-weight: 300;
  color: var(--color-text-secondary);
  margin-bottom: 40px;
}

.cta-qr {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.cta-qr img {
  width: 120px;
  height: 120px;
  border-radius: 12px;
  background: var(--color-white);
  padding: 8px;
}

.cta-qr span {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* Footer */
.footer {
  background: #050505;
  padding: 64px 0 32px;
  border-top: 1px solid var(--color-border);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  height: 32px;
  margin-bottom: 16px;
}

.footer-brand-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 64px;
  flex-wrap: wrap;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.footer-link {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--color-text-primary);
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.footer-copyright {
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Mobile Nav */
.nav-open .nav {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav-open .nav-toggle span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 4px);
}

.nav-open .nav-toggle span:nth-child(2) {
  opacity: 0;
}

.nav-open .nav-toggle span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Responsive */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .capabilities-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 48px;
  }
  
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(20px);
    padding: 40px 24px;
    gap: 24px;
    transform: translateY(-20px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }
  
  .nav-link {
    font-size: 17px;
  }
  
  .nav-dropdown {
    width: 100%;
  }
  
  .dropdown-menu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    padding-top: 8px;
    display: none;
  }
  
  .dropdown-item {
    background: transparent;
    padding: 12px 16px;
    border-radius: 8px;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero {
    min-height: auto;
    padding: calc(var(--header-height) + 80px) 24px 100px;
  }
  
  .hero-scroll {
    display: none;
  }
  
  .section {
    padding: 80px 0;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .capabilities-grid {
    grid-template-columns: 1fr;
  }
  
  .partners-grid {
    grid-template-columns: 1fr;
  }
  
  .why-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-top {
    flex-direction: column;
  }
  
  .footer-links {
    gap: 32px;
  }
  
  .btn {
    padding: 12px 24px;
    font-size: 14px;
  }
  
  .btn-large {
    padding: 14px 32px;
    font-size: 15px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }
  
  .hero-subtitle {
    font-size: 15px;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
  
  .section-title {
    font-size: 24px;
  }
  
  .feature-card,
  .why-card,
  .capability-card,
  .partner-card {
    padding: 32px 24px;
  }
}