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

:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #e8f0fe;
    --success: #34a853;
    --warning: #fbbc04;
    --danger: #ea4335;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --bg-gray: #f1f3f4;
    --text-dark: #202124;
    --text-gray: #5f6368;
    --text-light: #80868b;
    --border: #dadce0;
    --shadow-sm: 0 1px 3px rgba(60,64,67,0.1);
    --shadow-md: 0 4px 12px rgba(60,64,67,0.15);
    --shadow-lg: 0 8px 24px rgba(60,64,67,0.2);
    --radius: 12px;
    --radius-lg: 24px;
    --transition: 0.25s ease;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Google Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Navigation */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow-sm); }
.nav-inner {
    display: flex; align-items: center; justify-content: space-between;
    max-width: 1200px; margin: 0 auto; padding: 0 24px; height: 68px;
}
.nav-brand {
    display: flex; align-items: center; gap: 12px;
    font-size: 18px; font-weight: 600; color: var(--text-dark);
}
.nav-brand svg { width: 36px; height: 36px; }
.nav-menu { display: flex; align-items: center; gap: 8px; list-style: none; }
.nav-menu a {
    display: block; padding: 10px 18px; border-radius: 24px;
    font-size: 14px; font-weight: 500; color: var(--text-gray);
    transition: all var(--transition);
}
.nav-menu a:hover { background: var(--bg-gray); color: var(--text-dark); }
.nav-menu a.active { background: var(--primary-light); color: var(--primary); }
.nav-download {
    background: var(--primary) !important; color: #fff !important;
    padding: 10px 22px !important;
}
.nav-download:hover { background: var(--primary-dark) !important; }
.nav-toggle {
    display: none; background: none; border: none; cursor: pointer;
    color: var(--text-dark); padding: 8px;
}

/* Hero */
.hero {
    min-height: 100vh; display: flex; align-items: center;
    padding: 100px 0 60px;
    background: linear-gradient(135deg, #e8f4fd 0%, #fff 50%, #fef7e0 100%);
    position: relative; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: -200px; right: -200px;
    width: 600px; height: 600px; border-radius: 50%;
    background: radial-gradient(circle, rgba(26,115,232,0.08) 0%, transparent 70%);
}
.hero-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.hero-tag {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--bg-white); border: 1px solid var(--border);
    padding: 8px 16px; border-radius: 50px; font-size: 13px;
    color: var(--text-gray); margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}
.hero-tag svg { width: 16px; height: 16px; color: var(--success); }
.hero h1 {
    font-size: 56px; font-weight: 700; line-height: 1.15;
    color: var(--text-dark); margin-bottom: 20px;
}
.hero h1 span { color: var(--primary); }
.hero-desc {
    font-size: 18px; color: var(--text-gray); max-width: 480px;
    margin-bottom: 32px; line-height: 1.7;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 16px 32px; border-radius: 30px;
    font-size: 16px; font-weight: 600; border: none; cursor: pointer;
    transition: all var(--transition);
}
.btn svg { width: 20px; height: 20px; }
.btn-primary {
    background: var(--primary); color: #fff;
    box-shadow: 0 4px 16px rgba(26,115,232,0.35);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(26,115,232,0.45);
}
.btn-outline {
    background: var(--bg-white); color: var(--text-dark);
    border: 2px solid var(--border);
}
.btn-outline:hover {
    border-color: var(--primary); color: var(--primary);
}
.hero-visual {
    display: flex; justify-content: center; align-items: center;
    position: relative;
}
.hero-browser {
    width: 100%; max-width: 520px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--border);
}
.browser-header {
    display: flex; align-items: center; gap: 8px;
    padding: 14px 18px;
    background: var(--bg-gray);
    border-bottom: 1px solid var(--border);
}
.browser-dots { display: flex; gap: 6px; }
.browser-dots span {
    width: 12px; height: 12px; border-radius: 50%;
}
.browser-dots span:nth-child(1) { background: var(--danger); }
.browser-dots span:nth-child(2) { background: var(--warning); }
.browser-dots span:nth-child(3) { background: var(--success); }
.browser-url {
    flex: 1; display: flex; align-items: center; gap: 8px;
    background: var(--bg-white); padding: 8px 14px; border-radius: 20px;
    margin-left: 12px; font-size: 13px; color: var(--text-light);
}
.browser-url svg { width: 14px; height: 14px; color: var(--success); }
.browser-content {
    padding: 40px;
    display: flex; flex-direction: column; align-items: center;
    text-align: center;
}
.chrome-logo { width: 120px; height: 120px; margin-bottom: 24px; }
.browser-content h3 {
    font-size: 20px; color: var(--text-dark); margin-bottom: 8px;
}
.browser-content p {
    font-size: 14px; color: var(--text-gray);
}

/* Stats */
.stats {
    display: flex; gap: 48px; margin-top: 48px;
}
.stat-item { text-align: left; }
.stat-num {
    font-size: 32px; font-weight: 700; color: var(--primary);
}
.stat-label { font-size: 14px; color: var(--text-light); }

/* Section Common */
section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 {
    font-size: 40px; font-weight: 700; color: var(--text-dark);
    margin-bottom: 16px;
}
.section-header p {
    font-size: 18px; color: var(--text-gray); max-width: 600px; margin: 0 auto;
}

/* Features */
.features { background: var(--bg-light); }
.features-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
}
.feature-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 36px 28px;
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}
.feature-icon {
    width: 56px; height: 56px; border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px;
}
.feature-icon svg { width: 28px; height: 28px; }
.fi-blue { background: #e8f0fe; color: var(--primary); }
.fi-green { background: #e6f4ea; color: var(--success); }
.fi-yellow { background: #fef7e0; color: #f9ab00; }
.fi-red { background: #fce8e6; color: var(--danger); }
.fi-purple { background: #f3e8fd; color: #9334e6; }
.fi-cyan { background: #e4f7fb; color: #12b5cb; }
.feature-card h3 {
    font-size: 20px; font-weight: 600; color: var(--text-dark);
    margin-bottom: 12px;
}
.feature-card p {
    font-size: 15px; color: var(--text-gray); line-height: 1.7;
}

/* Platforms */
.platforms-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.platform-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition);
}
.platform-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.platform-icon {
    width: 72px; height: 72px; margin: 0 auto 20px;
    border-radius: 20px;
    display: flex; align-items: center; justify-content: center;
    background: var(--bg-gray);
}
.platform-icon svg { width: 36px; height: 36px; color: var(--text-dark); }
.platform-card h3 {
    font-size: 18px; font-weight: 600; color: var(--text-dark);
    margin-bottom: 6px;
}
.platform-card .ver {
    font-size: 13px; color: var(--text-light); margin-bottom: 20px;
}
.platform-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    width: 100%; padding: 14px 24px; border-radius: 8px;
    background: var(--primary); color: #fff;
    font-size: 14px; font-weight: 600; border: none; cursor: pointer;
    transition: all var(--transition);
}
.platform-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}
.platform-btn svg { width: 18px; height: 18px; }

/* Reviews */
.reviews { background: var(--bg-light); }
.reviews-slider {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}
.review-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 32px;
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.review-card:hover { box-shadow: var(--shadow-sm); }
.review-stars { display: flex; gap: 4px; margin-bottom: 16px; }
.review-stars svg { width: 18px; height: 18px; color: var(--warning); }
.review-text {
    font-size: 15px; color: var(--text-gray); line-height: 1.8;
    margin-bottom: 20px;
}
.review-author { display: flex; align-items: center; gap: 14px; }
.review-avatar {
    width: 48px; height: 48px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), #4285f4);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 18px; color: #fff;
}
.review-info h4 { font-size: 15px; font-weight: 600; color: var(--text-dark); }
.review-info span { font-size: 13px; color: var(--text-light); }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
    background: var(--bg-white);
    overflow: hidden;
    transition: all var(--transition);
}
.faq-item.active { border-color: var(--primary); }
.faq-question {
    display: flex; align-items: center; justify-content: space-between;
    padding: 20px 24px; cursor: pointer;
    font-size: 16px; font-weight: 600; color: var(--text-dark);
}
.faq-question:hover { background: var(--bg-gray); }
.faq-question svg {
    width: 22px; height: 22px; color: var(--text-light);
    transition: transform var(--transition);
    flex-shrink: 0;
}
.faq-item.active .faq-question svg { transform: rotate(180deg); }
.faq-answer {
    max-height: 0; overflow: hidden;
    transition: max-height 0.4s ease;
}
.faq-item.active .faq-answer { max-height: 500px; }
.faq-answer-inner {
    padding: 0 24px 24px;
    font-size: 15px; color: var(--text-gray); line-height: 1.8;
}

/* Footer */
.site-footer {
    background: var(--bg-gray);
    border-top: 1px solid var(--border);
    padding: 48px 0 32px;
    text-align: center;
}
.footer-verify {
    display: inline-flex; align-items: center; gap: 10px;
    background: #e6f4ea; border: 1px solid #ceead6;
    padding: 12px 24px; border-radius: 50px;
    font-size: 14px; color: var(--success);
    margin-bottom: 20px;
}
.footer-verify svg { width: 18px; height: 18px; }
.footer-copy {
    font-size: 13px; color: var(--text-light); line-height: 1.8;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; text-align: center; }
    .hero-desc { margin: 0 auto 32px; }
    .hero-actions { justify-content: center; }
    .hero-visual { order: -1; margin-bottom: 40px; }
    .hero-browser { max-width: 400px; }
    .stats { justify-content: center; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .platforms-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-slider { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-menu { display: none; }
    .nav-toggle { display: block; }
    .hero { padding: 90px 0 50px; min-height: auto; }
    .hero h1 { font-size: 36px; }
    .hero-desc { font-size: 16px; }
    .chrome-logo { width: 80px; height: 80px; }
    section { padding: 60px 0; }
    .section-header h2 { font-size: 28px; }
    .features-grid, .platforms-grid, .reviews-slider { grid-template-columns: 1fr; }
    .stats { flex-direction: column; gap: 20px; text-align: center; }
}