/* ============================================
   Edge Evolution - Global Styles
   Design: Dark Tech, Blue Accent, Clean
   ============================================ */

/* CSS Variables */
:root {
  /* Colors */
  --primary: #00D4FF;
  --primary-dark: #00B8E6;
  --secondary: #6366F1;
  --accent: #22D3EE;
  --bg-dark: #0A0F1C;
  --bg-mid: #111827;
  --bg-surface: #1E293B;
  --bg-surface-hover: #253449;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --border: #334155;
  --border-light: #475569;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary), var(--secondary));
  --gradient-glow: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(99,102,241,0.15));
  
  /* Shadows */
  --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.15);
  --shadow-glow-strong: 0 0 60px rgba(0, 212, 255, 0.25);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  
  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  --space-3xl: 96px;
  
  /* Typography */
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Layout */
  --max-width: 1280px;
  --nav-height: 72px;
  
  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* 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: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-dark);
  overflow-x: hidden;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 15, 28, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(51, 65, 85, 0.5);
  z-index: 1000;
}

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

.nav-logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo-text {
  font-size: 18px;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-sub {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-fast);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Language Switch */
.lang-switch {
  display: flex;
  gap: 4px;
  background: var(--bg-surface);
  padding: 4px;
  border-radius: var(--radius-md);
}

.lang-btn {
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  letter-spacing: 0.5px;
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.active {
  background: var(--gradient-primary);
  color: var(--bg-dark);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: calc(var(--nav-height) + var(--space-xl)) var(--space-md) var(--space-xl);
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

/* Grid Lines */
.grid-lines {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(51, 65, 85, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(51, 65, 85, 0.3) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

/* Glow Effects */
.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.4;
}

.glow-1 {
  width: 600px;
  height: 600px;
  background: var(--primary);
  top: -200px;
  right: -200px;
}

.glow-2 {
  width: 500px;
  height: 500px;
  background: var(--secondary);
  bottom: -150px;
  left: -150px;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 8px 16px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: var(--radius-full);
  font-size: 13px;
  color: var(--primary);
  margin-bottom: var(--space-md);
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
  font-size: clamp(48px, 10vw, 80px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-md);
}

.title-cn {
  display: block;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-en {
  display: block;
  font-size: 0.35em;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-top: var(--space-xs);
}

.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto var(--space-xl);
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--bg-dark);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-strong);
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-secondary:hover {
  background: rgba(0, 212, 255, 0.1);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 18px 36px;
  font-size: 16px;
}

/* Hero Scroll */
.hero-scroll {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--primary), transparent);
  animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============================================
   Services Section
   ============================================ */
.services {
  padding: var(--space-3xl) 0;
  background: var(--bg-mid);
  position: relative;
}

.services::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0.3;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.section-sub {
  font-size: 16px;
  color: var(--text-secondary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.service-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.service-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.service-card:hover::before {
  opacity: 1;
}

.service-card.featured {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), rgba(99, 102, 241, 0.08));
}

.service-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--primary);
  margin-bottom: var(--space-md);
}

.service-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.service-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  transition: gap var(--transition-fast);
}

.service-link:hover {
  gap: 10px;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  padding: var(--space-3xl) 0;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(0, 212, 255, 0.08), transparent 70%);
}

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

.cta-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.cta-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

.footer-logo {
  margin-bottom: var(--space-sm);
}

.footer-tagline {
  font-size: 14px;
  color: var(--text-muted);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  padding: 6px 0;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* ============================================
   Page Header
   ============================================ */
.page-header {
  padding: calc(var(--nav-height) + var(--space-2xl)) 0 var(--space-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-title {
  font-size: 42px;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-sm);
}

.page-sub {
  font-size: 16px;
  color: var(--text-secondary);
  letter-spacing: 2px;
}

/* ============================================
   Content Blocks
   ============================================ */
.section {
  padding: var(--space-2xl) 0;
}

.section-alt {
  background: var(--bg-mid);
}

.content-block {
  max-width: 720px;
  margin: 0 auto;
}

.content-title {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.content-title.centered {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.content-text {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============================================
   Values Grid
   ============================================ */
.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  max-width: 960px;
  margin: 0 auto;
}

.value-item {
  text-align: center;
  padding: var(--space-lg);
}

.value-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--primary);
}

.value-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   Founder Block
   ============================================ */
.founder-block {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: var(--space-xl);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.founder-name {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

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

/* ============================================
   Contact Layout
   ============================================ */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.contact-info h2 {
  margin-bottom: var(--space-xl);
}

.contact-type {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border);
}

.contact-type:last-child {
  border-bottom: none;
}

.contact-type h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.contact-type p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.email-card {
  background: var(--bg-surface);
  border: 1px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  box-shadow: var(--shadow-glow);
}

.email-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.email-address {
  font-size: 20px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--space-sm);
  font-family: var(--font-mono);
}

.email-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
  
  .footer-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-links {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero {
    padding-top: calc(var(--nav-height) + var(--space-lg));
  }
  
  .hero-title {
    font-size: 42px;
  }
  
  .hero-desc {
    font-size: 16px;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .services {
    padding: var(--space-2xl) 0;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .values-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-layout {
    grid-template-columns: 1fr;
  }
  
  .page-title {
    font-size: 32px;
  }
  
  .founder-block {
    padding: var(--space-lg);
  }
}