/* style.css - 高配版 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&display=swap');

:root {
    --primary: #0066FF;
    --primary-dark: #0052cc;
    --secondary: #1F2937;
    --text-main: #111827;
    --text-muted: #6B7280;
    --bg-light: #F3F4F6;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #0066FF 0%, #00C6FF 100%);
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--white);
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

/* --- 按钮样式 --- */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 14px rgba(0, 102, 255, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 255, 0.4);
}

.btn-outline {
    border: 2px solid var(--primary);
    color: var(--primary);
    margin-left: 10px;
}

.btn-outline:hover {
    background: var(--bg-light);
}

/* --- 导航栏 --- */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-menu { display: flex; gap: 40px; align-items: center; }
.nav-menu a { font-weight: 500; color: var(--secondary); font-size: 0.95rem; }
.nav-menu a:hover { color: var(--primary); }

/* --- Hero Section (首屏) --- */
.hero {
    padding: 100px 0 60px;
    overflow: hidden;
}

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

.hero-text h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 24px;
    background: -webkit-linear-gradient(45deg, #111, #555);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 32px;
}

.hero-image img {
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.5s;
}

.hero-image:hover img {
    transform: perspective(1000px) rotateY(0deg);
}

/* --- Logo Wall --- */
.trusted-by {
    padding: 40px 0;
    background: var(--bg-light);
    text-align: center;
}

.trusted-by p {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.logos {
    display: flex;
    justify-content: center;
    gap: 50px;
    opacity: 0.6;
    flex-wrap: wrap;
}

.logos span { font-weight: 700; font-size: 1.5rem; color: #9ca3af; }

/* --- Features Alternating (图文交替) --- */
.feature-section { padding: 100px 0; }

.feature-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 80px;
    margin-bottom: 100px;
}

.feature-row.reverse { direction: rtl; }
.feature-row.reverse .feature-text { direction: ltr; }

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

.feature-text p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 30px;
}

.feature-text ul li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-img img {
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

/* --- Stats Section --- */
.stats {
    background: var(--secondary);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.stats-grid {
    display: flex;
    justify-content: space-around;
}

.stat-item h3 { font-size: 3rem; color: var(--primary); margin-bottom: 10px; }
.stat-item p { font-size: 1.1rem; opacity: 0.8; }

/* --- CTA Section --- */
.cta-section {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(to bottom, #fff, #f0f9ff);
}

.cta-section h2 { font-size: 2.8rem; margin-bottom: 20px; }

/* --- Privacy Page Specific --- */
.legal-layout {
    max-width: 800px;
    margin: 60px auto;
    padding: 0 20px;
}
.legal-layout h1 { margin-bottom: 40px; font-size: 3rem; }
.legal-layout h2 { margin: 30px 0 15px; color: var(--secondary); }
.legal-layout p, .legal-layout li { color: #4b5563; margin-bottom: 15px; font-size: 1.05rem; }

/* --- Footer --- */
footer {
    background: #111;
    color: #ccc;
    padding: 80px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-col h4 { color: white; margin-bottom: 20px; font-size: 1.1rem; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a:hover { color: var(--primary); }

.copyright {
    border-top: 1px solid #333;
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
}

/* Mobile */
@media (max-width: 768px) {
    .hero-wrapper, .feature-row, .stats-grid, .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .hero h1 { font-size: 2.5rem; }
    .nav-menu { display: none; } /* 简化版：隐藏菜单 */
    .feature-row.reverse { direction: ltr; }
    .stats-grid { flex-direction: column; gap: 40px; }
}