/* ========================================
   NovaTech AI - Modern Tech Company Website
   ======================================== */

/* CSS Variables */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #8b5cf6;
  --accent: #a855f7;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --gray: #64748b;
  --gray-light: #94a3b8;
  --white: #ffffff;
  --bg-light: #f8fafc;
  --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
  --gradient-2: linear-gradient(135deg, var(--secondary), var(--accent));
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--dark);
  background: var(--white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul {
  list-style: none;
}

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

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 48px;
  height: 48px;
  animation: logo-spin 20s linear infinite;
}

.logo-ring {
  animation: logo-ring-rotate 8s linear infinite;
  transform-origin: center;
}

.logo-ring-inner {
  animation: logo-ring-rotate-reverse 12s linear infinite;
  transform-origin: center;
}

.logo-core {
  animation: logo-pulse 2s ease-in-out infinite;
}

@keyframes logo-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes logo-ring-rotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes logo-ring-rotate-reverse {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(-360deg); }
}

@keyframes logo-pulse {
  0%, 100% { opacity: 1; r: 6; }
  50% { opacity: 0.7; r: 7; }
}

.logo-text {
  font-size: 1.75rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray);
  position: relative;
  padding: 0.5rem 0;
}

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

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.lang-btn {
  color: var(--gray);
  font-weight: 500;
  transition: var(--transition);
}

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

.lang-divider {
  color: var(--gray-light);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 5px;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--dark);
  transition: var(--transition);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
}

.hero-particles {
  position: absolute;
  inset: 0;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--primary);
  border-radius: 50%;
  opacity: 0.3;
  animation: float 15s infinite ease-in-out;
}

@keyframes float {
  0%, 100% { transform: translateY(0) translateX(0); opacity: 0.3; }
  25% { transform: translateY(-100px) translateX(50px); opacity: 0.6; }
  50% { transform: translateY(-50px) translateX(-30px); opacity: 0.4; }
  75% { transform: translateY(-150px) translateX(20px); opacity: 0.5; }
}

.hero-gradient {
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 150%;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  flex: 1;
  max-width: 560px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.6s ease-out;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--gray);
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.hero-actions {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
  animation: fadeInUp 0.6s ease-out 0.3s backwards;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 12px;
  transition: all 0.3s ease;
  white-space: nowrap;
  min-width: 160px;
  letter-spacing: 0.5px;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  border: none;
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(102, 126, 234, 0.5);
  background: linear-gradient(135deg, #7b8ff0 0%, #8a5db8 100%);
}

.btn-secondary {
  background: transparent;
  color: var(--dark);
  border: 2px solid #a78bfa;
  position: relative;
  overflow: hidden;
}

.btn-secondary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}

.btn-secondary:hover {
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.btn-secondary:hover::before {
  opacity: 1;
}

.hero-stats {
  display: flex;
  gap: 3rem;
  animation: fadeInUp 0.6s ease-out 0.4s backwards;
}

.stat-item {
  text-align: left;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  display: block;
  font-size: 0.875rem;
  color: var(--gray);
  margin-top: 0.25rem;
}

.hero-visual {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  max-width: 500px;
  min-height: 450px;
  opacity: 1;
}

/* Tech Orbit Container - Clean & Elegant */
.tech-orbit-container {
  position: relative;
  width: 320px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Central Glowing Orb */
.central-orb {
  position: absolute;
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.orb-glow {
  position: absolute;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.4) 0%, rgba(139, 92, 246, 0.1) 50%, transparent 70%);
  border-radius: 50%;
  animation: orbGlow 4s ease-in-out infinite;
}

.orb-core {
  position: absolute;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
  border-radius: 50%;
  box-shadow: 
    0 0 30px rgba(99, 102, 241, 0.6),
    0 0 60px rgba(139, 92, 246, 0.4),
    inset 0 0 20px rgba(255, 255, 255, 0.3);
  animation: orbCore 4s ease-in-out infinite;
}

.orb-shine {
  position: absolute;
  width: 20px;
  height: 20px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.8) 0%, transparent 70%);
  border-radius: 50%;
  top: 15px;
  left: 20px;
  animation: orbShine 4s ease-in-out infinite;
}

@keyframes orbGlow {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
}

@keyframes orbCore {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes orbShine {
  0%, 100% { opacity: 0.6; transform: translate(0, 0); }
  50% { opacity: 1; transform: translate(2px, 2px); }
}

/* Orbiting Rings */
.orbit-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(99, 102, 241, 0.2);
  animation: orbitSpin 20s linear infinite;
}

.orbit-ring::before {
  content: '';
  position: absolute;
  width: 6px;
  height: 6px;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border-radius: 50%;
  top: -3px;
  left: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.8);
}

.orbit-1 {
  width: 180px;
  height: 180px;
  animation-duration: 12s;
}

.orbit-2 {
  width: 240px;
  height: 240px;
  animation-direction: reverse;
  animation-duration: 18s;
  border-color: rgba(139, 92, 246, 0.15);
}

.orbit-3 {
  width: 300px;
  height: 300px;
  animation-duration: 25s;
  border-color: rgba(168, 85, 247, 0.1);
}

@keyframes orbitSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Satellites */
.satellite {
  position: absolute;
  animation: satOrbit 8s linear infinite;
}

.sat-1 { animation-duration: 8s; }
.sat-2 { animation-duration: 10s; animation-direction: reverse; animation-delay: -3s; }
.sat-3 { animation-duration: 12s; animation-delay: -6s; }

.sat-dot {
  width: 12px;
  height: 12px;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border-radius: 50%;
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.8);
  animation: satPulse 2s ease-in-out infinite;
}

.sat-trail {
  position: absolute;
  width: 30px;
  height: 2px;
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.6), transparent);
  top: 50%;
  right: 100%;
  transform: translateY(-50%);
  border-radius: 1px;
}

.sat-1 .sat-trail { transform: translateY(-50%) rotate(180deg); }
.sat-2 .sat-trail { transform: translateY(-50%) rotate(180deg); }

@keyframes satOrbit {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes satPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.8; }
}

/* Floating Particles */
.particle {
  position: absolute;
  width: 6px;
  height: 6px;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border-radius: 50%;
  opacity: 0.6;
  animation: particleFloat 6s ease-in-out infinite;
}

.p1 { top: 15%; left: 10%; animation-delay: 0s; animation-duration: 5s; }
.p2 { top: 25%; right: 15%; animation-delay: 1s; animation-duration: 6s; }
.p3 { bottom: 30%; left: 5%; animation-delay: 2s; animation-duration: 7s; }
.p4 { bottom: 20%; right: 10%; animation-delay: 0.5s; animation-duration: 5.5s; }
.p5 { top: 50%; left: 0%; animation-delay: 1.5s; animation-duration: 6.5s; }
.p6 { top: 45%; right: 5%; animation-delay: 2.5s; animation-duration: 5s; }

@keyframes particleFloat {
  0%, 100% { 
    transform: translateY(0) scale(1); 
    opacity: 0.4;
  }
  50% { 
    transform: translateY(-20px) scale(1.2); 
    opacity: 0.8;
  }
}

/* Connection Lines SVG */
.connection-svg {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.conn-line {
  stroke: url(#lineGradient);
  stroke-width: 1;
  stroke-dasharray: 4 4;
  opacity: 0.3;
  animation: lineFlow 3s linear infinite;
}

.cl1 { animation-delay: 0s; }
.cl2 { animation-delay: 0.75s; }
.cl3 { animation-delay: 1.5s; }
.cl4 { animation-delay: 2.25s; }

@keyframes lineFlow {
  from { stroke-dashoffset: 0; }
  to { stroke-dashoffset: -16; }
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--gray);
  font-size: 0.875rem;
  animation: bounce 2s infinite;
}

.mouse {
  width: 26px;
  height: 40px;
  border: 2px solid var(--gray-light);
  border-radius: 13px;
  position: relative;
}

.wheel {
  width: 4px;
  height: 8px;
  background: var(--primary);
  border-radius: 2px;
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  animation: scrollWheel 2s infinite;
}

@keyframes scrollWheel {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Section Common Styles
   ======================================== */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 4rem;
}

.section-tag {
  display: inline-block;
  padding: 0.375rem 1rem;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--gray);
}

/* ========================================
   Models Section
   ======================================== */
.models {
  padding: 100px 0;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  position: relative;
  overflow: hidden;
}

.models::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(139, 92, 246, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.models-showcase {
  position: relative;
  z-index: 1;
}

.models-counter {
  text-align: center;
  margin-bottom: 3rem;
}

.counter-number {
  display: inline-flex;
  align-items: baseline;
  gap: 0.25rem;
}

.counter {
  font-family: 'Inter', -apple-system, 'PingFang SC', sans-serif;
  font-size: 6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.counter-suffix {
  font-family: 'Inter', -apple-system, 'PingFang SC', sans-serif;
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-color);
}

.counter-label {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.models-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.model-card {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  text-align: center;
}

.model-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.model-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(139, 92, 246, 0.15);
}

.model-card:hover::before {
  transform: scaleX(1);
}

.model-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}

.model-card:hover .model-icon {
  transform: scale(1.1);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.model-icon svg,
.model-icon img {
  width: 36px;
  height: 36px;
}

.model-icon img {
  object-fit: contain;
  filter: brightness(0) invert(1);
}

.model-icon.gpt {
  background: linear-gradient(135deg, #10a37f 0%, #0d8a6a 100%);
}

.model-icon.claude {
  background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
}

.model-icon.gemini {
  background: linear-gradient(135deg, #4285f4 0%, #1a73e8 100%);
}

.model-icon.deepseek {
  background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
}

.model-icon.doubao {
  background: linear-gradient(135deg, #ea580c 0%, #c2410c 100%);
}

.model-icon .icon-text {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  line-height: 1;
  letter-spacing: -0.5px;
}

.model-icon.qwen {
  background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 100%);
}

.model-card h3 {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.model-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.model-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
  margin-top: 1rem;
  background: var(--primary-light);
  color: var(--primary-color);
}

.model-badge.new {
  background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
  color: #1d4ed8;
}

.model-badge.featured {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  color: #b45309;
}

.models-features {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.feature-item svg {
  width: 24px;
  height: 24px;
  color: var(--primary-color);
  flex-shrink: 0;
}

.feature-item span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
}

@media (max-width: 1024px) {
  .models-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .counter {
    font-size: 4.5rem;
  }
  
  .counter-suffix {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .models {
    padding: 60px 0;
  }
  
  .models-grid {
    grid-template-columns: 1fr;
  }
  
  .counter {
    font-size: 3.5rem;
  }
  
  .counter-suffix {
    font-size: 1.5rem;
  }
  
  .models-features {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }
}

/* ========================================
   About Section
   ======================================== */
/* ========================================
   About Section
   ======================================== */
.about {
  padding: 100px 0;
  background: #f8fafc;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.about-text p {
  margin-bottom: 1.5rem;
  color: #64748b;
  line-height: 1.8;
  font-size: 1.0625rem;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.about-feature {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.75rem;
  padding: 1.5rem;
  background: #fff;
  border-radius: 16px;
  transition: all 0.3s ease;
}

.about-feature:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.about-feature-icon {
  width: 3rem;
  height: 3rem;
  background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-feature-icon svg {
  width: 1.5rem;
  height: 1.5rem;
  stroke: #8b5cf6;
}

.about-feature h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #1e293b;
  margin: 0;
}

.about-feature p {
  font-size: 0.875rem;
  color: #64748b;
  margin: 0;
  line-height: 1.4;
}

.about-visual {
  position: relative;
}

.about-illustration {
  position: relative;
  background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
  border-radius: 24px;
  padding: 2rem;
  box-shadow: 0 20px 40px rgba(139, 92, 246, 0.1);
}

.network-svg {
  width: 100%;
  height: auto;
}

@media (max-width: 1024px) {
  .about {
    padding: 5rem 0;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about-features {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .about-features {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .about-feature {
    flex-direction: row;
    text-align: left;
    padding: 1.25rem;
  }
}

/* ========================================
   Services Section
   ======================================== */
.services {
  padding: 100px 0;
  background: var(--white);
}

.services-grid {
  display: flex;
  flex-direction: column;
  gap: 4rem;
}

.service-card {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: center;
  padding: 3rem;
  background: var(--bg-light);
  border-radius: var(--radius-xl);
  transition: var(--transition);
}

.service-card:nth-child(even) {
  direction: rtl;
}

.service-card:nth-child(even) > * {
  direction: ltr;
}

.service-card:hover {
  box-shadow: var(--shadow-xl);
}

.service-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

/* AI Animation */
.ai-animation {
  position: relative;
  width: 280px;
  height: 280px;
}

.ai-brain {
  position: relative;
  width: 100%;
  height: 100%;
}

.brain-node {
  position: absolute;
  width: 40px;
  height: 40px;
  background: var(--gradient);
  border-radius: 50%;
  animation: pulse 3s ease-in-out infinite;
}

.brain-node.n1 { top: 20%; left: 20%; animation-delay: 0s; }
.brain-node.n2 { top: 20%; right: 20%; animation-delay: 0.5s; }
.brain-node.n3 { top: 50%; left: 50%; transform: translate(-50%, -50%); animation-delay: 1s; width: 60px; height: 60px; }
.brain-node.n4 { bottom: 20%; left: 20%; animation-delay: 1.5s; }
.brain-node.n5 { bottom: 20%; right: 20%; animation-delay: 2s; }

.brain-lines {
  position: absolute;
  inset: 0;
  background: 
    linear-gradient(90deg, transparent 49%, var(--primary) 49%, var(--primary) 51%, transparent 51%),
    linear-gradient(0deg, transparent 49%, var(--primary) 49%, var(--primary) 51%, transparent 51%);
  background-size: 100% 100%;
  opacity: 0.1;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  50% { transform: scale(1.2); opacity: 1; }
}

/* Agent Animation */
.agent-animation {
  position: relative;
  width: 280px;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.agent-orb {
  position: relative;
  width: 200px;
  height: 200px;
}

.orb-ring {
  position: absolute;
  border: 2px solid var(--primary);
  border-radius: 50%;
  animation: orbit 4s linear infinite;
}

.orb-ring.r1 { width: 100%; height: 100%; animation-duration: 4s; }
.orb-ring.r2 { width: 75%; height: 75%; top: 12.5%; left: 12.5%; animation-duration: 3s; animation-direction: reverse; }
.orb-ring.r3 { width: 50%; height: 50%; top: 25%; left: 25%; animation-duration: 2s; }

.orb-core {
  position: absolute;
  width: 60px;
  height: 60px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--gradient);
  border-radius: 50%;
  animation: glow 2s ease-in-out infinite;
}

@keyframes orbit {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.5); }
  50% { box-shadow: 0 0 40px rgba(99, 102, 241, 0.8); }
}

/* Skill Animation */
.skill-animation {
  perspective: 800px;
  width: 280px;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.skill-cube {
  width: 120px;
  height: 120px;
  position: relative;
  transform-style: preserve-3d;
  animation: rotateCube 8s linear infinite;
}

.cube-face {
  position: absolute;
  width: 120px;
  height: 120px;
  border: 3px solid var(--primary);
  background: rgba(99, 102, 241, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.cube-face.front { transform: translateZ(60px); }
.cube-face.back { transform: translateZ(-60px) rotateY(180deg); }
.cube-face.right { transform: rotateY(90deg) translateZ(60px); }
.cube-face.left { transform: rotateY(-90deg) translateZ(60px); }
.cube-face.top { transform: rotateX(90deg) translateZ(60px); }
.cube-face.bottom { transform: rotateX(-90deg) translateZ(60px); }

@keyframes rotateCube {
  from { transform: rotateX(-20deg) rotateY(0deg); }
  to { transform: rotateX(-20deg) rotateY(360deg); }
}

.service-content {
  padding: 1rem 0;
}

.service-number {
  font-size: 4rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0.2;
  line-height: 1;
  margin-bottom: 1rem;
}

.service-content h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.service-content > p {
  color: var(--gray);
  margin-bottom: 1.5rem;
  font-size: 1.0625rem;
  line-height: 1.8;
}

.service-features {
  margin-bottom: 1.5rem;
}

.service-features li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--gray);
}

.service-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.625rem;
  width: 8px;
  height: 8px;
  background: var(--gradient);
  border-radius: 50%;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--primary);
}

.service-link:hover {
  gap: 0.75rem;
}

/* ========================================
   Advantages Section
   ======================================== */
.advantages {
  padding: 100px 0;
  background: var(--dark);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.advantages-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.grid-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
}

.advantages .container {
  position: relative;
  z-index: 1;
}

.advantages .section-tag {
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-light);
}

.advantages .section-title {
  color: var(--white);
}

.advantages .section-desc {
  color: var(--gray-light);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.advantage-card {
  padding: 2rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-xl);
  transition: var(--transition);
}

.advantage-card:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-5px);
}

.advantage-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient);
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
}

.advantage-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--white);
}

.advantage-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.advantage-card p {
  color: var(--gray-light);
  font-size: 0.9375rem;
}

/* ========================================
   Process Section
   ======================================== */
.process {
  padding: 100px 0;
  background: var(--bg-light);
}

.process-timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  position: relative;
}

.process-step {
  position: relative;
  text-align: center;
}

.step-number {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient);
  color: var(--white);
  font-size: 1.5rem;
  font-weight: 800;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  position: relative;
  z-index: 2;
}

.step-line {
  position: absolute;
  top: 32px;
  left: calc(50% + 40px);
  width: calc(100% - 80px);
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0.3;
}

.process-step:last-child .step-line {
  display: none;
}

.step-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.step-content p {
  color: var(--gray);
  font-size: 0.9375rem;
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
  padding: 100px 0;
  background: var(--white);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.contact-info {
  padding: 2rem 0;
}

.contact-info .section-title {
  text-align: left;
  margin-bottom: 1rem;
}

.contact-desc {
  color: var(--gray);
  margin-bottom: 2.5rem;
  font-size: 1.0625rem;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(99, 102, 241, 0.1);
  border-radius: var(--radius-lg);
  flex-shrink: 0;
}

.contact-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--primary);
}

.contact-label {
  display: block;
  font-size: 0.875rem;
  color: var(--gray);
  margin-bottom: 0.25rem;
}

.contact-value {
  font-weight: 600;
  color: var(--dark);
}

a.contact-value:hover {
  color: var(--primary);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-link {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-light);
  border-radius: var(--radius-md);
  color: var(--gray);
  transition: var(--transition);
}

.social-link:hover {
  background: var(--gradient);
  color: var(--white);
}

.social-link svg {
  width: 20px;
  height: 20px;
}

/* QR Code Section */
.contact-form-wrapper {
  background: var(--bg-light);
  padding: 2.5rem;
  border-radius: var(--radius-xl);
}

.qr-code-section {
  text-align: center;
}

.qr-section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.5rem;
}

.qr-section-desc {
  font-size: 1rem;
  color: var(--gray);
  margin-bottom: 2rem;
}

.qr-codes-container {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.qr-code-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.qr-code-box {
  position: relative;
  width: 160px;
  height: 160px;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: 
    0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06),
    0 0 0 1px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

.qr-code-box:hover {
  transform: translateY(-4px);
  box-shadow: 
    0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 10px 10px -5px rgba(0, 0, 0, 0.04),
    0 0 0 1px rgba(0, 0, 0, 0.05);
}

.qr-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-placeholder svg {
  width: 100%;
  height: 100%;
}

.qr-glow {
  position: absolute;
  inset: -4px;
  border-radius: calc(var(--radius-lg) + 4px);
  background: linear-gradient(135deg, #8b5cf6, #6366f1);
  opacity: 0;
  z-index: -1;
  filter: blur(12px);
  transition: var(--transition);
}

.qr-code-box:hover .qr-glow {
  opacity: 0.4;
}

.qr-glow-cyan {
  background: linear-gradient(135deg, #06b6d4, #8b5cf6);
}

.qr-label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--dark);
}

.contact-alternative {
  padding-top: 2rem;
  border-top: 1px solid rgba(148, 163, 184, 0.2);
}

.contact-alternative > p {
  font-size: 0.9375rem;
  color: var(--gray);
  margin-bottom: 1rem;
}

.contact-methods {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.contact-method-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: var(--transition);
}

.contact-method-link:hover {
  color: var(--primary-dark);
}

.contact-method-link svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 640px) {
  .qr-codes-container {
    flex-direction: column;
    align-items: center;
    gap: 2rem;
  }
  
  .contact-methods {
    flex-direction: column;
    gap: 1rem;
  }
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--dark);
  color: var(--white);
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 4rem;
  margin-bottom: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer-logo .logo-icon {
  width: 40px;
  height: 40px;
}

.footer-logo span {
  font-size: 1.25rem;
  font-weight: 700;
}

.footer-tagline {
  color: var(--gray-light);
  font-size: 0.9375rem;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-column h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--white);
}

.footer-column ul li {
  margin-bottom: 0.75rem;
}

.footer-column ul li a {
  color: var(--gray-light);
  font-size: 0.9375rem;
  transition: var(--transition);
}

.footer-column ul li a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
}

.footer-bottom p {
  color: var(--gray);
  font-size: 0.875rem;
}

.footer-bottom-links {
  display: flex;
  gap: 2rem;
}

.footer-bottom-links a {
  color: var(--gray);
  font-size: 0.875rem;
}

.footer-bottom-links a:hover {
  color: var(--primary-light);
}

/* ========================================
   Toast Notification
   ======================================== */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  transform: translateY(100px);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.toast-content {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: var(--dark);
  color: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
}

.toast-icon {
  width: 24px;
  height: 24px;
  stroke: #22c55e;
}

/* ========================================
   Reveal Animation
   ======================================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
/* 滚动时显示已触发的reveal元素 */
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
  .service-card {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .service-card:nth-child(even) {
    direction: ltr;
  }
  
  .process-timeline {
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
  }
  
  .process-step .step-line {
    display: none;
  }
  
  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
  
  .hero {
    padding: 100px 0 60px;
  }
  
  .hero-inner {
    flex-direction: column;
    text-align: center;
    gap: 3rem;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .hero-actions {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .hero-stats {
    justify-content: center;
    gap: 2rem;
  }
  
  .hero-visual {
    max-width: 100%;
    min-height: 350px;
  }
  
  .tech-orbit-container {
    transform: scale(0.85);
  }
  
  .service-card {
    padding: 2rem;
  }
  
  .process-timeline {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-stats {
    flex-direction: row;
    justify-content: space-around;
    gap: 0.5rem;
    width: 100%;
  }
  
  .stat-item {
    text-align: center;
    flex: 1;
    min-width: 0;
  }
  
  .stat-number {
    font-size: 1.75rem;
  }
  
  .stat-label {
    font-size: 0.75rem;
  }
  
  .hero-visual {
    min-height: 300px;
  }
  
  .ai-hero-container {
    transform: scale(0.85);
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .service-content h3 {
    font-size: 1.5rem;
  }
  
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   PWA Install Banner
   ======================================== */
.pwa-install-banner {
  position: fixed;
  bottom: -100px;
  left: 0;
  right: 0;
  z-index: 9999;
  padding: 0 1rem;
  transition: bottom 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.pwa-install-banner.show {
  bottom: 0;
}

.pwa-install-content {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 600px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  background: var(--dark);
  border-radius: 1rem 1rem 0 0;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
}

.pwa-install-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
}

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

.pwa-install-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.pwa-install-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
}

.pwa-install-desc {
  font-size: 0.75rem;
  color: var(--gray-light);
}

.pwa-install-btn {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.pwa-install-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.pwa-install-btn svg {
  width: 20px;
  height: 20px;
  stroke: white;
}

.pwa-install-close {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.pwa-install-close:hover {
  opacity: 1;
}

.pwa-install-close svg {
  width: 18px;
  height: 18px;
  stroke: var(--gray-light);
}

@media (max-width: 480px) {
  .pwa-install-banner {
    padding: 0 0.5rem;
  }
  
  .pwa-install-content {
    padding: 0.75rem 1rem;
    gap: 0.75rem;
  }
  
  .pwa-install-icon {
    width: 40px;
    height: 40px;
  }
  
  .pwa-install-text {
    flex: 1;
  }
  
  .pwa-install-title {
    font-size: 0.9rem;
  }
  
  .pwa-install-desc {
    font-size: 0.7rem;
  }
  
  .pwa-install-btn {
    width: 40px;
    height: 40px;
  }
}