/* 
 * 谷歌浏览器 - 全新玻璃态暗色主题设计
 * 设计风格：玻璃态、霓虹渐变、现代化暗色主题
 */

/* ===== 变量定义 ===== */
:root {
  /* 主色调 - 霓虹渐变 */
  --neon-blue: #00c6ff;
  --neon-purple: #0072ff;
  --neon-green: #00ff88;
  --neon-pink: #ff00ff;
  --neon-yellow: #ffff00;
  
  /* 背景色 - 暗色渐变 */
  --bg-dark: #0a0a0f;
  --bg-darker: #05050a;
  --bg-card: rgba(20, 20, 30, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.05);
  
  /* 文字颜色 */
  --text-primary: #ffffff;
  --text-secondary: #b0b0d0;
  --text-muted: #8080a0;
  
  /* 边框与阴影 */
  --border-glow: 0 0 20px rgba(0, 198, 255, 0.3);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-neon: 0 0 30px rgba(0, 114, 255, 0.5);
  
  /* 圆角 */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;
  
  /* 过渡效果 */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 基础重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(0, 114, 255, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(0, 198, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 80%, rgba(0, 255, 136, 0.08) 0%, transparent 50%);
  z-index: -1;
}

/* ===== 容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 玻璃态效果 ===== */
.glass {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glass);
}

.glow {
  position: relative;
}

.glow::after {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, var(--neon-blue), var(--neon-purple), var(--neon-green));
  border-radius: calc(var(--radius-lg) + 2px);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.glow:hover::after {
  opacity: 0.5;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 15px 0;
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chrome-logo {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 0 20px rgba(0, 198, 255, 0.5);
}

.chrome-gradient {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: conic-gradient(
    from 0deg,
    #ea4335 0deg 120deg,
    #fbbc04 120deg 240deg,
    #34a853 240deg 360deg
  );
}

.brand-text {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-menu {
  display: flex;
  gap: 30px;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.nav-link i {
  font-size: 1.1rem;
}

.nav-btn {
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
  color: white;
  padding: 10px 24px;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-neon);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(0, 114, 255, 0.7);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ===== 英雄区域 ===== */
.hero {
  padding: 160px 0 100px;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 198, 255, 0.1) 0%, transparent 70%);
  z-index: -1;
}

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

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-green), var(--neon-pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 60px;
}

/* ===== 按钮样式 ===== */
.btn-primary {
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
  color: white;
  padding: 16px 32px;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all var(--transition-normal);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: var(--shadow-neon);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 50px rgba(0, 114, 255, 0.8);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  padding: 16px 32px;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all var(--transition-normal);
  border: 1px solid rgba(255, 255, 255, 0.3);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--neon-blue);
}

.btn-large {
  padding: 18px 40px;
  font-size: 1.2rem;
}

.btn-xl {
  padding: 20px 48px;
  font-size: 1.3rem;
}

/* ===== 统计卡片 ===== */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 80px;
}

.stat {
  text-align: center;
  padding: 30px;
  min-width: 180px;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 8px;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ===== 特性区域 ===== */
.features {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  padding: 40px 30px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-10px);
  border-color: var(--neon-blue);
  box-shadow: var(--border-glow);
}

.feature-icon {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 25px;
  font-size: 1.8rem;
  background: rgba(255, 255, 255, 0.1);
}

.feature-icon.speed {
  color: var(--neon-green);
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
}

.feature-icon.security {
  color: var(--neon-blue);
  box-shadow: 0 0 20px rgba(0, 198, 255, 0.3);
}

.feature-icon.sync {
  color: var(--neon-purple);
  box-shadow: 0 0 20px rgba(0, 114, 255, 0.3);
}

.feature-icon.extensions {
  color: var(--neon-pink);
  box-shadow: 0 0 20px rgba(255, 0, 255, 0.3);
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 下载区域 ===== */
.download-section {
  padding: 100px 0;
}

.download-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.download-info h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.download-desc {
  color: var(--text-secondary);
  margin-bottom: 30px;
  font-size: 1.1rem;
}

.version-card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin-bottom: 40px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.version-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
}

.version-header h3 {
  font-size: 1.3rem;
  color: var(--text-primary);
}

.version-badge {
  background: linear-gradient(90deg, var(--neon-green), var(--neon-blue));
  color: white;
  padding: 6px 15px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
}

.version-details .detail {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 15px;
  color: var(--text-secondary);
}

.version-details .detail i {
  color: var(--neon-blue);
  font-size: 1.1rem;
}

.download-note {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 20px;
}

.platforms {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.platform {
  text-align: center;
  padding: 25px 15px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.platform:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--neon-blue);
}

.platform i {
  font-size: 2.5rem;
  margin-bottom: 12px;
  display: block;
}

.platform:nth-child(1) i { color: #00adef; } /* Windows */
.platform:nth-child(2) i { color: #a6b1b7; } /* Apple */
.platform:nth-child(3) i { color: #fcc624; } /* Linux */
.platform:nth-child(4) i { color: #3ddc84; } /* Android */
.platform:nth-child(5) i { color: #007aff; } /* iOS */

.platform span {
  display: block;
  color: var(--text-primary);
  font-weight: 500;
}

/* ===== 系统要求 ===== */
.requirements {
  padding: 100px 0;
}

.requirements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.req-card {
  padding: 35px 30px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-normal);
}

.req-card:hover {
  transform: translateY(-8px);
  border-color: var(--neon-green);
}

.req-icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--neon-blue);
}

.req-card h3 {
  font-size: 1.4rem;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.req-card ul {
  list-style: none;
}

.req-card li {
  color: var(--text-secondary);
  margin-bottom: 10px;
  padding-left: 20px;
  position: relative;
}

.req-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--neon-green);
  font-weight: bold;
}

/* ===== 常见问题 ===== */
.faq {
  padding: 100px 0;
}

.faq-grid {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 20px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.faq-question {
  padding: 25px 30px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: rgba(255, 255, 255, 0.05);
}

.faq-question h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.faq-question i {
  color: var(--neon-blue);
  transition: transform var(--transition-fast);
}

.faq-answer {
  padding: 0 30px;
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-item.active .faq-answer {
  padding: 0 30px 25px;
  max-height: 500px;
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

/* ===== 页脚 ===== */
.footer {
  padding: 80px 0 40px;
  background: rgba(5, 5, 10, 0.9);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 100px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 60px;
  margin-bottom: 60px;
}

.footer-brand {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.chrome-logo.small {
  width: 60px;
  height: 60px;
  flex-shrink: 0;
}

.brand-info h3 {
  font-size: 1.8rem;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.brand-info p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.link-group h4 {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: var(--text-primary);
  font-weight: 600;
}

.link-group a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}

.link-group a:hover {
  color: var(--neon-blue);
}

.footer-bottom {
  text-align: center;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ===== 响应式设计 ===== */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.8rem;
  }
  
  .download-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 30px 20px;
    gap: 25px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .hero {
    padding: 140px 0 80px;
  }
  
  .hero-title {
    font-size: 2.3rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-stats {
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }
  
  .stat {
    width: 100%;
    max-width: 300px;
  }
  
  .features-grid,
  .requirements-grid {
    grid-template-columns: 1fr;
  }
  
  .platforms {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .btn-primary,
  .btn-secondary {
    padding: 14px 28px;
    font-size: 1rem;
  }
  
  .btn-large {
    padding: 16px 32px;
  }
  
  .btn-xl {
    padding: 18px 36px;
  }
  
  .section-header h2 {
    font-size: 2rem;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
  }
}

/* ===== 辅助类 ===== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--neon-blue);
  color: white;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: 1001;
}

.skip-link:focus {
  top: 20px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== 动画效果 ===== */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.float {
  animation: float 3s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

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