/* Chrome 风格现代浏览器下载站样式 */
:root {
  --primary: #4285f4;
  --primary-dark: #3367d6;
  --accent: #34a853;
  --text: #202124;
  --text-light: #5f6368;
  --bg: #f8f9fa;
  --card: #ffffff;
  --border: #dadce0;
}

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

body {
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  overflow-x: hidden;
}

header {
  background: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

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

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

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-light);
  font-weight: 500;
  transition: color 0.2s;
  padding: 8px 0;
  position: relative;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a.active {
  color: var(--primary);
  font-weight: 600;
}

.nav-links a.active:after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--primary);
  border-radius: 3px;
}

.hero {
  background: linear-gradient(135deg, #4285f4 0%, #34a853 100%);
  color: white;
  padding: 120px 24px 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(255,255,255,0.2) 0%, transparent 70%);
  animation: pulse 15s infinite ease-in-out;
}

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

.hero h1 {
  font-size: 52px;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
  text-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.hero p {
  font-size: 22px;
  margin-bottom: 40px;
  opacity: 0.95;
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

.download-btn {
  background: white;
  color: #202124;
  padding: 16px 48px;
  font-size: 20px;
  font-weight: 600;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 280px;
  justify-content: center;
}

.download-btn:hover {
  transform: translateY(-4px);
  box-shadow: 0 15px 35px rgba(0,0,0,0.25);
  background: #f1f3f4;
}

.download-btn svg {
  width: 28px;
  height: 28px;
}

.section {
  padding: 80px 24px;
  max-width: 1280px;
  margin: 0 auto;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  color: var(--text);
}

.section-subtitle {
  font-size: 20px;
  text-align: center;
  color: var(--text-light);
  max-width: 620px;
  margin: 0 auto 60px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.feature-card {
  background: white;
  border-radius: 16px;
  padding: 36px 28px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  transition: all 0.3s ease;
  border: 1px solid var(--border);
}

.feature-card:hover {
  transform: translateY(-12px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.12);
  border-color: #4285f4;
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: #f0f4ff;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--primary);
}

.feature-card h3 {
  font-size: 22px;
  margin-bottom: 14px;
  color: var(--text);
}

.feature-card p {
  color: var(--text-light);
  font-size: 15.5px;
  line-height: 1.7;
}

.platforms {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.platform-card {
  background: white;
  border: 2px solid #e8eaed;
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  transition: all 0.3s;
}

.platform-card:hover {
  border-color: var(--primary);
  box-shadow: 0 10px 30px rgba(66, 133, 244, 0.15);
}

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

.platform-card h3 {
  font-size: 22px;
  margin-bottom: 8px;
}

.platform-card .version {
  color: var(--accent);
  font-weight: 600;
  font-size: 15px;
}

.testimonials {
  background: #f8f9fa;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.testimonial {
  background: white;
  padding: 28px;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

.stars {
  color: #fbbc05;
  font-size: 20px;
  margin-bottom: 14px;
}

.testimonial p {
  font-style: italic;
  margin-bottom: 18px;
  line-height: 1.65;
}

.testimonial .author {
  font-weight: 600;
  color: var(--text);
}

.stats {
  background: linear-gradient(90deg, #4285f4, #34a853);
  color: white;
  text-align: center;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 40px;
}

.stat-item h3 {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 8px;
}

.comparison {
  background: white;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  font-size: 15px;
}

th, td {
  padding: 18px 20px;
  text-align: left;
  border-bottom: 1px solid #e8eaed;
}

th {
  background: #f8f9fa;
  font-weight: 600;
  color: var(--text);
}

tr:hover {
  background: #f8f9fa;
}

.faq {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 22px 28px;
  background: white;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  transition: background 0.2s;
}

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

.faq-answer {
  padding: 0 28px 28px;
  display: none;
  color: var(--text-light);
  line-height: 1.75;
  font-size: 15.2px;
}

.faq-answer.show {
  display: block;
}

.download-section {
  background: #f8f9fa;
}

.download-main {
  background: white;
  border-radius: 20px;
  padding: 60px 50px;
  text-align: center;
  box-shadow: 0 15px 45px rgba(0,0,0,0.1);
  max-width: 720px;
  margin: 0 auto 60px;
}

.download-main h2 {
  font-size: 38px;
  margin-bottom: 12px;
}

.download-main .version-info {
  color: var(--accent);
  font-size: 18px;
  margin-bottom: 40px;
}

.btn-large {
  padding: 18px 64px;
  font-size: 21px;
  border-radius: 60px;
}

.install-guide {
  background: white;
  border-radius: 16px;
  padding: 40px;
}

.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);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
  font-size: 18px;
  box-shadow: 0 4px 12px rgba(66,133,244,0.3);
}

.footer {
  background: #202124;
  color: #9aa0a6;
  padding: 60px 24px 30px;
  font-size: 14px;
  line-height: 1.8;
}

.footer-content {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.footer p {
  margin-bottom: 12px;
}

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

@media (max-width: 768px) {
  .hero h1 {
    font-size: 38px;
  }
  
  .hero p {
    font-size: 18px;
  }
  
  .nav-links {
    gap: 20px;
    font-size: 14px;
  }
  
  .section {
    padding: 60px 16px;
  }
}