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

:root {
    --primary: #409EFF;
    --primary-dark: #337ecc;
    --dark: #1a1a2e;
    --text: #333;
    --text-light: #666;
    --bg: #fff;
    --bg-alt: #f5f7fa;
    --border: #e4e7ed;
}

body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; color: var(--text); line-height: 1.6; }

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

/* 导航 */
.navbar { position: fixed; top: 0; width: 100%; background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); z-index: 1000; }
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-brand { display: flex; align-items: center; gap: 10px; }
.nav-logo { width: 36px; height: 36px; border-radius: 6px; object-fit: contain; }
.nav-title { font-size: 20px; font-weight: 700; color: var(--dark); }
.nav-menu { display: flex; list-style: none; gap: 32px; }
.nav-menu a { text-decoration: none; color: var(--text); font-size: 15px; transition: color 0.2s; }
.nav-menu a:hover, .nav-menu a.active { color: var(--primary); }

/* Hero */
.hero { padding: 120px 0 80px; background: linear-gradient(135deg, #f0f7ff 0%, #e8f4fd 50%, #f0f2f5 100%); }
.hero .container { display: flex; align-items: center; gap: 60px; }
.hero-content { flex: 1; }
.hero-content h1 { font-size: 48px; font-weight: 800; color: var(--dark); margin-bottom: 16px; }
.hero-subtitle { font-size: 22px; color: var(--primary); font-weight: 500; margin-bottom: 20px; }
.hero-desc { font-size: 16px; color: var(--text-light); line-height: 1.8; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; }
.btn { display: inline-block; padding: 12px 32px; border-radius: 6px; font-size: 16px; font-weight: 500; text-decoration: none; transition: all 0.2s; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

/* Dashboard Preview */
.hero-image { flex: 1; }
.dashboard-preview { background: #fff; border-radius: 12px; box-shadow: 0 8px 32px rgba(0,0,0,0.1); overflow: hidden; }
.preview-header { display: flex; align-items: center; gap: 8px; padding: 12px 16px; background: #f0f2f5; }
.preview-header .dot { width: 10px; height: 10px; border-radius: 50%; }
.preview-header .dot.red { background: #ff5f56; }
.preview-header .dot.yellow { background: #ffbd2e; }
.preview-header .dot.green { background: #27c93f; }
.preview-title { font-size: 13px; color: #999; margin-left: 8px; }
.preview-body { display: flex; height: 280px; }
.preview-sidebar { width: 60px; background: #304156; padding: 16px 10px; }
.preview-menu-item { height: 8px; background: rgba(255,255,255,0.3); border-radius: 2px; margin-bottom: 16px; }
.preview-menu-item.active { background: rgba(255,255,255,0.6); width: 70%; }
.preview-main { flex: 1; padding: 20px; }
.preview-card { height: 80px; background: #f0f2f5; border-radius: 8px; margin-bottom: 16px; }
.preview-card.small { flex: 1; height: 100px; }
.preview-row { display: flex; gap: 12px; }

/* Sections */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { font-size: 32px; font-weight: 700; text-align: center; color: var(--dark); margin-bottom: 12px; }
.section-desc { text-align: center; color: var(--text-light); font-size: 16px; margin-bottom: 48px; }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card { background: #fff; padding: 32px 24px; border-radius: 12px; border: 1px solid var(--border); transition: transform 0.2s, box-shadow 0.2s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
.card-icon { font-size: 36px; margin-bottom: 16px; }
.card h3 { font-size: 18px; margin-bottom: 12px; color: var(--dark); }
.card p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* Features */
.features-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.feature-item h4 { font-size: 17px; color: var(--dark); margin-bottom: 8px; }
.feature-item p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* About */
.about-content { display: flex; gap: 60px; align-items: flex-start; }
.about-text { flex: 1; }
.about-text p { font-size: 15px; color: var(--text-light); margin-bottom: 16px; line-height: 1.8; }
.about-meta { margin-top: 24px; }
.about-meta p { font-size: 14px; margin-bottom: 8px; }
.about-meta a { color: var(--primary); text-decoration: none; }
.about-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.stat { text-align: center; padding: 24px; background: #fff; border-radius: 12px; border: 1px solid var(--border); }
.stat-number { display: block; font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-label { display: block; font-size: 13px; color: var(--text-light); margin-top: 4px; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.contact-card { background: #fff; padding: 32px 24px; border-radius: 12px; border: 1px solid var(--border); text-align: center; }
.contact-card h4 { font-size: 17px; margin-bottom: 12px; }
.contact-card p { font-size: 14px; color: var(--text-light); margin-bottom: 4px; }

/* Footer */
.footer { background: var(--dark); color: rgba(255,255,255,0.6); padding: 32px 0; }
.footer-content { display: flex; justify-content: space-between; align-items: center; }
.footer a { color: rgba(255,255,255,0.6); text-decoration: none; }
.footer a:hover { color: #fff; }
.footer-links { display: flex; gap: 12px; align-items: center; }
.footer .divider { color: rgba(255,255,255,0.3); }

/* Responsive */
@media (max-width: 768px) {
    .hero .container { flex-direction: column; }
    .hero-content h1 { font-size: 32px; }
    .card-grid, .features-list { grid-template-columns: 1fr; }
    .about-content { flex-direction: column; }
    .about-stats { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
    .nav-menu { display: none; }
}

/* Page */
.page-section { padding: 120px 0 60px; }
.page-section h1 { font-size: 28px; margin-bottom: 24px; }
.page-section h2 { font-size: 20px; margin: 24px 0 12px; }
.page-section p { font-size: 15px; color: var(--text-light); line-height: 1.8; margin-bottom: 12px; }