/* ===================================
   美国诺德公司 - TG 智能营销中枢
   花生壳风格 - 深色炫酷 UI
   =================================== */

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

:root {
  /* 深色主题 */
  --bg-dark-start: #0f172a;
  --bg-dark-mid: #1e293b;
  --bg-dark-end: #0f172a;
  
  /* 文字颜色 */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --text-light: #f8fafc;
  
  /* 品牌色 */
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #60a5fa;
  --secondary: #10b981;
  --accent: #8b5cf6;
  --danger: #ef4444;
  --danger-dark: #dc2626;
  
  /* 边框 */
  --border-light: #e2e8f0;
  --border-dark: #334155;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* 圆角 */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: #fff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

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

/* ===================================
   导航栏
   =================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  width: 36px;
  height: 36px;
  color: var(--primary-light);
}

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

.logo-name {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-light);
  line-height: 1.2;
}

.logo-sub {
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.nav-link {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: #fff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-light);
  border-radius: var(--radius-full);
  transition: all 0.2s ease;
}

.contact-btn svg {
  width: 18px;
  height: 18px;
}

.contact-btn.whatsapp {
  background: linear-gradient(135deg, #25d366 0%, #128c7e 100%);
}

.contact-btn.whatsapp:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
}

.contact-btn.telegram {
  background: linear-gradient(135deg, #0088cc 0%, #005f8f 100%);
}

.contact-btn.telegram:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 136, 204, 0.4);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: var(--spacing-sm);
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-btn span {
  width: 20px;
  height: 2px;
  background: var(--text-light);
  border-radius: 2px;
}

/* ===================================
   Hero 区域
   =================================== */
.hero {
  position: relative;
  min-height: 100vh;
  padding-top: 64px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse at 20% 20%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(16, 185, 129, 0.08) 0%, transparent 60%),
    linear-gradient(135deg, var(--bg-dark-start) 0%, var(--bg-dark-mid) 50%, var(--bg-dark-end) 100%);
  background-size: 200% 200%, 200% 200%, 200% 200%, 100% 100%;
  animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
  0%, 100% {
    background-position: 0% 50%, 100% 50%, 50% 0%, 0% 0%;
  }
  25% {
    background-position: 50% 0%, 50% 100%, 100% 50%, 0% 0%;
  }
  50% {
    background-position: 100% 50%, 0% 50%, 50% 100%, 0% 0%;
  }
  75% {
    background-position: 50% 100%, 50% 0%, 0% 50%, 0% 0%;
  }
}

.hero-bg::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: 
    conic-gradient(from 0deg at 50% 50%, 
      transparent 0deg, 
      rgba(59, 130, 246, 0.03) 60deg, 
      transparent 120deg,
      rgba(139, 92, 246, 0.03) 180deg,
      transparent 240deg,
      rgba(16, 185, 129, 0.03) 300deg,
      transparent 360deg);
  animation: rotateBg 30s linear infinite;
  pointer-events: none;
}

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

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 30% 30%, rgba(59, 130, 246, 0.2) 0%, transparent 40%),
    radial-gradient(circle at 70% 70%, rgba(139, 92, 246, 0.15) 0%, transparent 40%);
  animation: pulseGlow 4s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes pulseGlow {
  0% { opacity: 0.5; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.1); }
}

/* 动态粒子效果 */
.particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  box-shadow: 
    0 0 10px rgba(59, 130, 246, 0.8),
    0 0 20px rgba(59, 130, 246, 0.4);
  animation: particleFloat 20s linear infinite;
}

.particle:nth-child(1) { left: 10%; animation-delay: 0s; animation-duration: 25s; }
.particle:nth-child(2) { left: 20%; animation-delay: 2s; animation-duration: 20s; }
.particle:nth-child(3) { left: 30%; animation-delay: 4s; animation-duration: 28s; }
.particle:nth-child(4) { left: 40%; animation-delay: 1s; animation-duration: 22s; }
.particle:nth-child(5) { left: 50%; animation-delay: 3s; animation-duration: 26s; }
.particle:nth-child(6) { left: 60%; animation-delay: 5s; animation-duration: 21s; }
.particle:nth-child(7) { left: 70%; animation-delay: 2.5s; animation-duration: 24s; }
.particle:nth-child(8) { left: 80%; animation-delay: 1.5s; animation-duration: 27s; }
.particle:nth-child(9) { left: 90%; animation-delay: 3.5s; animation-duration: 23s; }
.particle:nth-child(10) { left: 15%; animation-delay: 0.5s; animation-duration: 25s; }
.particle:nth-child(11) { left: 25%; animation-delay: 4.5s; animation-duration: 20s; }
.particle:nth-child(12) { left: 35%; animation-delay: 2.5s; animation-duration: 28s; }
.particle:nth-child(13) { left: 45%; animation-delay: 1.5s; animation-duration: 22s; }
.particle:nth-child(14) { left: 55%; animation-delay: 3.5s; animation-duration: 26s; }
.particle:nth-child(15) { left: 65%; animation-delay: 0.5s; animation-duration: 21s; }
.particle:nth-child(16) { left: 75%; animation-delay: 4s; animation-duration: 24s; }
.particle:nth-child(17) { left: 85%; animation-delay: 2s; animation-duration: 27s; }
.particle:nth-child(18) { left: 95%; animation-delay: 1s; animation-duration: 23s; }
.particle:nth-child(19) { left: 5%; animation-delay: 3s; animation-duration: 25s; }
.particle:nth-child(20) { left: 50%; animation-delay: 5s; animation-duration: 30s; }

@keyframes particleFloat {
  0% {
    transform: translateY(100vh) scale(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
    transform: translateY(90vh) scale(1);
  }
  90% {
    opacity: 1;
    transform: translateY(10vh) scale(1);
  }
  100% {
    transform: translateY(-10vh) scale(0);
    opacity: 0;
  }
}

.particle:nth-child(odd) {
  background: rgba(59, 130, 246, 0.8);
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.8);
}

.particle:nth-child(3n) {
  background: rgba(139, 92, 246, 0.8);
  box-shadow: 0 0 15px rgba(139, 92, 246, 0.8);
}

.particle:nth-child(5n) {
  background: rgba(16, 185, 129, 0.8);
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.8);
  width: 3px;
  height: 3px;
}

/* 光效圆环 */
.glow-rings {
  position: absolute;
  top: 50%;
  left: 75%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.glow-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(59, 130, 246, 0.3);
  animation: ringExpand 4s ease-out infinite;
}

.ring-1, .ring-2, .ring-3 {
  width: 100px;
  height: 100px;
  margin: -50px 0 0 -50px;
}

.ring-2 { animation-delay: 1.3s; }
.ring-3 { animation-delay: 2.6s; }

@keyframes ringExpand {
  0% {
    transform: scale(0.5);
    opacity: 0.8;
    border-color: rgba(59, 130, 246, 0.5);
  }
  100% {
    transform: scale(4);
    opacity: 0;
    border-color: rgba(139, 92, 246, 0);
  }
}

/* 流动光线 */
.light-beams {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.light-beam {
  position: absolute;
  width: 2px;
  height: 150px;
  background: linear-gradient(to bottom, transparent, rgba(59, 130, 246, 0.6), transparent);
  transform-origin: center center;
  animation: beamMove 8s ease-in-out infinite;
}

.beam-1 {
  left: 20%;
  top: 30%;
  transform: rotate(45deg);
  animation-delay: 0s;
}

.beam-2 {
  left: 60%;
  top: 50%;
  transform: rotate(-30deg);
  animation-delay: 2s;
  height: 120px;
  background: linear-gradient(to bottom, transparent, rgba(139, 92, 246, 0.5), transparent);
  animation-name: beamMove2;
}

.beam-3 {
  left: 80%;
  top: 20%;
  transform: rotate(60deg);
  animation-delay: 4s;
  height: 100px;
  background: linear-gradient(to bottom, transparent, rgba(16, 185, 129, 0.5), transparent);
  animation-name: beamMove3;
}

@keyframes beamMove {
  0%, 100% {
    opacity: 0;
    transform: translateY(0) rotate(45deg);
  }
  50% {
    opacity: 1;
    transform: translateY(100px) rotate(45deg);
  }
}

@keyframes beamMove2 {
  0%, 100% {
    opacity: 0;
    transform: translateY(0) rotate(-30deg);
  }
  50% {
    opacity: 1;
    transform: translateY(-80px) rotate(-30deg);
  }
}

@keyframes beamMove3 {
  0%, 100% {
    opacity: 0;
    transform: translateY(0) rotate(60deg);
  }
  50% {
    opacity: 1;
    transform: translateY(60px) rotate(60deg);
  }
}

.hero-container {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-xl);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  min-height: calc(100vh - 64px);
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--danger-light);
  margin-bottom: var(--spacing-xl);
}

.badge-icon {
  font-size: var(--font-size-base);
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  line-height: 1.1;
  color: #ffffff;
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.8;
  text-shadow: 0 1px 5px rgba(0, 0, 0, 0.3);
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
}

.btn-large {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all 0.2s ease;
}

.btn-large svg {
  width: 20px;
  height: 20px;
}

.btn-red {
  color: #fff;
  background: linear-gradient(135deg, var(--danger) 0%, var(--danger-dark) 100%);
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-red:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

.btn-blue {
  color: #fff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-blue:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.stat-number {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: #ffffff;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.stat-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(255, 255, 255, 0.2);
}

/* Hero Visual */
.hero-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xl);
}

.device-mockup {
  position: relative;
  width: 100%;
  max-width: 500px;
  animation: deviceFloat 6s ease-in-out infinite;
}

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

.device-screen {
  background: linear-gradient(145deg, #1e293b 0%, #0f172a 100%);
  border-radius: var(--radius-2xl);
  border: 2px solid rgba(59, 130, 246, 0.3);
  overflow: hidden;
  box-shadow: 
    0 25px 50px -12px rgba(0, 0, 0, 0.5),
    0 0 100px rgba(59, 130, 246, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.screen-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.screen-dots {
  display: flex;
  gap: 6px;
}

.screen-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.screen-dots .dot-red { background: #ef4444; }
.screen-dots .dot-yellow { background: #f59e0b; }
.screen-dots .dot-green { background: #22c55e; }

.screen-title {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.screen-content {
  padding: var(--spacing-xl);
  min-height: 320px;
  background: 
    radial-gradient(ellipse at top left, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

.connection-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--text-light);
  background: rgba(34, 197, 94, 0.1);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.screen-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.grid-item {
  padding: var(--spacing-lg);
  background: rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(59, 130, 246, 0.3);
  text-align: center;
  transition: all 0.3s ease;
  box-shadow: 
    0 4px 15px rgba(59, 130, 246, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.grid-item:hover {
  transform: scale(1.05);
  border-color: rgba(59, 130, 246, 0.6);
  box-shadow: 
    0 8px 25px rgba(59, 130, 246, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.item-icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
  filter: drop-shadow(0 2px 8px rgba(59, 130, 246, 0.5));
}

.item-text {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: #ffffff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.device-base {
  margin-top: var(--spacing-sm);
  height: 8px;
  background: linear-gradient(180deg, #334155 0%, #1e293b 100%);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.product-detail-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-light);
  background: rgba(59, 130, 246, 0.2);
  border: 2px solid rgba(59, 130, 246, 0.4);
  border-radius: var(--radius-xl);
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.2);
}

.product-detail-btn:hover {
  background: rgba(59, 130, 246, 0.3);
  border-color: rgba(59, 130, 246, 0.6);
  transform: translateY(-2px);
  box-shadow: 
    0 8px 25px rgba(59, 130, 246, 0.3),
    0 4px 10px rgba(59, 130, 246, 0.2);
}

.product-detail-btn svg {
  width: 16px;
  height: 16px;
}

.hero-wave {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  line-height: 0;
}

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

/* ===================================
   通用区块
   =================================== */
.section-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ===================================
   核心功能区
   =================================== */
.features {
  padding: var(--spacing-3xl) 0;
  background: #fff;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.feature-card {
  padding: var(--spacing-2xl);
  background: #fff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--secondary));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

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

.feature-card:hover {
  border-color: var(--primary-light);
  box-shadow: 
    0 20px 40px -10px rgba(59, 130, 246, 0.2),
    0 10px 20px -5px rgba(139, 92, 246, 0.1);
  transform: translateY(-6px);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-xl);
  color: var(--primary);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid rgba(59, 130, 246, 0.2);
  transition: all 0.3s ease;
  position: relative;
}

.feature-card:hover .feature-icon {
  transform: scale(1.1);
  border-color: var(--primary-light);
  box-shadow: 
    0 8px 20px rgba(59, 130, 246, 0.3),
    inset 0 0 20px rgba(59, 130, 246, 0.1);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  filter: drop-shadow(0 2px 4px rgba(59, 130, 246, 0.3));
}

.feature-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

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

/* ===================================
   个人用户功能区
   =================================== */
.personal {
  padding: var(--spacing-3xl) 0;
  background: #f8fafc;
}

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

.personal-card {
  padding: var(--spacing-2xl);
  background: #fff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  position: relative;
  overflow: hidden;
}

.personal-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

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

.personal-card:hover {
  border-color: var(--primary-light);
  box-shadow: 
    0 20px 40px -10px rgba(59, 130, 246, 0.15),
    0 10px 20px -5px rgba(139, 92, 246, 0.1);
  transform: translateY(-6px);
}

.card-icon {
  font-size: var(--font-size-3xl);
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  border-radius: var(--radius-xl);
  border: 2px solid var(--border-light);
  transition: all 0.3s ease;
}

.personal-card:hover .card-icon {
  transform: scale(1.1);
  border-color: var(--primary-light);
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.2);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-top: var(--spacing-sm);
}

.card-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
}

.card-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--primary);
  transition: all 0.3s ease;
}

.personal-card:hover .card-action {
  color: var(--primary-dark);
}

.card-action svg {
  width: 16px;
  height: 16px;
}

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

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--bg-dark-start) 0%, var(--bg-dark-mid) 100%);
}

.cta-content {
  position: relative;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.cta-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
}

.cta-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-muted);
  margin-bottom: var(--spacing-2xl);
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-light);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  transition: all 0.2s ease;
}

.download-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}

.download-btn.whatsapp {
  background: linear-gradient(135deg, #25d366 0%, #128c7e 100%);
  border: none;
}

.download-btn.telegram {
  background: linear-gradient(135deg, #0088cc 0%, #005f8f 100%);
  border: none;
}

.download-btn svg {
  width: 20px;
  height: 20px;
}

/* ===================================
   Footer
   =================================== */
.footer {
  background: var(--bg-dark-start);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: var(--spacing-3xl);
  padding-bottom: var(--spacing-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.footer-logo .logo-icon {
  width: 32px;
  height: 32px;
  color: var(--primary-light);
}

.footer-logo span {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-light);
}

.footer-desc {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 350px;
}

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

.footer-column h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
}

.footer-column a {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
  transition: color 0.2s ease;
}

.footer-column a:hover {
  color: var(--text-light);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-xl);
}

.copyright {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.social-link {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  color: var(--text-muted);
  transition: all 0.2s ease;
}

.social-link:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--text-light);
}

.social-link svg {
  width: 18px;
  height: 18px;
}

/* ===================================
   响应式设计
   =================================== */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .hero-cta {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .hero-visual {
    margin-top: var(--spacing-2xl);
  }
  
  .device-mockup {
    max-width: 360px;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .personal-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-main {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
}

@media (max-width: 768px) {
  .nav-links,
  .nav-actions {
    display: none;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-base);
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .btn-large {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .stat-divider {
    width: 60px;
    height: 1px;
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .trust-logos {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .download-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .download-btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .cta-title {
    font-size: var(--font-size-2xl);
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .personal-grid {
    grid-template-columns: 1fr;
  }
}