/* Chrome 浏览器官网风格 - 现代、简洁、专业、科技感 */
/* 完全原创设计，差异化于 Google 官方站点，利于 Bing SEO */

:root {
  --primary-blue: #1a73e8;
  --primary-dark: #202124;
  --accent-green: #34a853;
  --accent-yellow: #fbbc05;
  --accent-red: #ea4335;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --bg-light: #f8f9fa;
  --border-color: #dadce0;
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --hover-shadow: 0 12px 30px rgba(26, 115, 232, 0.15);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Google Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  color: var(--text-primary);
  background: #fff;
  overflow-x: hidden;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏 - 统一风格 */
.navbar {
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 22px;
}

.logo-svg {
  width: 32px;
  height: 32px;
}

.nav-menu {
  display: flex;
  gap: 8px;
  list-style: none;
}

.nav-menu a {
  padding: 10px 24px;
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  border-radius: 9999px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.nav-menu a:hover {
  background: #f1f3f4;
  color: var(--text-primary);
}

.nav-menu a.active {
  background: var(--primary-blue);
  color: white;
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(26, 115, 232, 0.3);
}

/* Hero 区域 */
.hero {
  background: linear-gradient(135deg, #f8f9fa 0%, #e8f0fe 100%);
  padding: 120px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(26,115,232,0.08) 0%, transparent 70%);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: white;
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 14px;
  color: var(--accent-green);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  margin-bottom: 24px;
  font-weight: 500;
}

.hero h1 {
  font-size: 3.2rem;
  line-height: 1.15;
  font-weight: 700;
  margin-bottom: 20px;
  background: linear-gradient(90deg, #1a73e8, #34a853);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero .subtitle {
  font-size: 1.35rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 40px;
  font-weight: 400;
}

.download-btn {
  background: var(--primary-blue);
  color: white;
  border: none;
  padding: 16px 48px;
  font-size: 1.15rem;
  font-weight: 600;
  border-radius: 50px;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(26, 115, 232, 0.35);
  transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  margin: 0 12px;
}

.download-btn:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(26, 115, 232, 0.45);
  background: #185abc;
}

.download-btn svg {
  width: 22px;
  height: 22px;
}

/* 特性卡片 */
.features {
  padding: 100px 0;
  background: white;
}

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

.section-header h2 {
  font-size: 2.4rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-header p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.feature-card {
  background: white;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 36px 32px;
  transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
  box-shadow: var(--card-shadow);
}

.feature-card:hover {
  transform: translateY(-12px);
  box-shadow: var(--hover-shadow);
  border-color: var(--primary-blue);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: #f0f7ff;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--primary-blue);
}

.feature-card h3 {
  font-size: 1.45rem;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.75;
}

/* 用户评价 */
.testimonials {
  padding: 100px 0;
  background: #f8f9fa;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 28px;
}

.testimonial-card {
  background: white;
  padding: 32px;
  border-radius: 20px;
  box-shadow: var(--card-shadow);
}

.stars {
  color: #fbbc05;
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.testimonial-card p {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 24px;
  color: #3c4043;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.testimonial-author img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
}

/* 统计数据 */
.stats {
  padding: 80px 0;
  background: linear-gradient(135deg, #1a73e8, #4285f4);
  color: white;
  text-align: center;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 40px;
  max-width: 1000px;
  margin: 0 auto;
}

.stat-item h3 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1;
}

.stat-item p {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* FAQ */
.faq {
  padding: 110px 0;
  background: white;
}

.faq-item {
  margin-bottom: 16px;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
}

.faq-question {
  padding: 24px 32px;
  background: white;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  font-size: 1.1rem;
  transition: all 0.2s;
}

.faq-question:hover {
  background: #f8f9fa;
}

.faq-answer {
  padding: 0 32px 28px;
  color: var(--text-secondary);
  line-height: 1.8;
  max-height: 0;
  overflow: hidden;
  transition: all 0.4s ease;
}

.faq-answer.show {
  max-height: 400px;
  padding-bottom: 32px;
}

/* 下载页面专用样式 */
.download-hero {
  background: linear-gradient(135deg, #34a853 0%, #1a73e8 100%);
  color: white;
  padding: 140px 0 90px;
  text-align: center;
}

.platform-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 60px;
}

.platform-card {
  background: white;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: transform 0.3s;
}

.platform-card:hover {
  transform: scale(1.03);
}

.platform-header {
  padding: 32px;
  text-align: center;
  border-bottom: 1px solid #eee;
}

.platform-icon {
  width: 68px;
  height: 68px;
  margin: 0 auto 20px;
}

.install-guide {
  background: #f8f9fa;
  border-radius: 20px;
  padding: 40px;
  margin: 60px 0;
}

.step {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  position: relative;
}

.step:last-child {
  margin-bottom: 0;
}

.step-number {
  width: 42px;
  height: 42px;
  background: var(--primary-blue);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(26,115,232,0.3);
}

.step-content h4 {
  margin-bottom: 8px;
  color: var(--text-primary);
}

.changelog {
  background: white;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 40px;
}

/* 页脚 */
.footer {
  background: #202124;
  color: #dadce0;
  padding: 60px 0 40px;
  font-size: 0.95rem;
}

.footer-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
}

.footer-links {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 20px;
}

.footer-links a {
  color: #9aa0a6;
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #8ab4f8;
}

.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.1);
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 15px;
  margin: 20px 0;
  border: 1px solid rgba(255,255,255,0.2);
}

/* 响应式 */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.4rem;
  }

  .hero .subtitle {
    font-size: 1.15rem;
  }

  .nav-menu {
    gap: 4px;
  }

  .nav-menu a {
    padding: 8px 16px;
    font-size: 0.95rem;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }
}

/* 加载动画 */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* SEO 优化 - 隐藏但对爬虫友好 */
.seo-text {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}