* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, "Microsoft YaHei", "PingFang SC", sans-serif; color: #333; background: #fff; line-height: 1.6; overflow-x: hidden; }
a { text-decoration: none; color: inherit; }

html { scroll-behavior: smooth; }

.nav {
    position: fixed; top: 0; left: 0; right: 0;
    background: rgba(255,255,255,0.97); backdrop-filter: blur(12px);
    padding: 0 40px; display: flex; align-items: center; justify-content: space-between;
    z-index: 100; border-bottom: 1px solid rgba(0,0,0,0.06);
    height: 60px; transition: box-shadow 0.3s;
}
.nav.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.1); }
.nav-logo { font-size: 20px; font-weight: bold; color: #1a73e8; display: flex; align-items: center; gap: 8px; }
.nav-logo svg { width: 28px; height: 28px; }
.nav-links { display: flex; gap: 24px; font-size: 14px; color: #555; }
.nav-links a { padding: 4px 0; position: relative; transition: color 0.2s; }
.nav-links a:hover { color: #1a73e8; }
.nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: #1a73e8; transition: width 0.3s; }
.nav-links a:hover::after { width: 100%; }
.nav-btn { background: #1a73e8; color: #fff; padding: 8px 20px; border-radius: 6px; font-size: 14px; border: none; cursor: pointer; transition: all 0.2s; }
.nav-btn:hover { background: #1557b0; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(26,115,232,0.3); }

.hero {
    padding: 120px 40px 80px; text-align: center;
    background: linear-gradient(135deg, #e8f0fe 0%, #f5f8ff 40%, #fff 100%);
    position: relative; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: -50%; right: -20%;
    width: 600px; height: 600px; border-radius: 50%;
    background: radial-gradient(circle, rgba(26,115,232,0.08) 0%, transparent 70%);
}
.hero-badge {
    display: inline-block; background: #1a73e8; color: #fff;
    padding: 6px 16px; border-radius: 20px; font-size: 13px;
    margin-bottom: 20px; letter-spacing: 1px;
}
.hero h1 { font-size: 46px; color: #1a1a1a; margin-bottom: 20px; font-weight: 700; }
.hero h1 span { color: #1a73e8; }
.hero-sub { font-size: 18px; color: #666; max-width: 640px; margin: 0 auto 36px; line-height: 1.7; }
.hero-values {
    display: flex; justify-content: center; gap: 24px; margin-bottom: 40px; flex-wrap: wrap;
}
.hero-value {
    background: #fff; padding: 16px 20px; border-radius: 10px;
    box-shadow: 0 2px 12px rgba(26,115,232,0.08);
    font-size: 14px; color: #555; display: flex; align-items: center; gap: 10px;
    transition: transform 0.2s, box-shadow 0.2s;
}
.hero-value:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(26,115,232,0.12); }
.hero-value-icon {
    width: 40px; height: 40px; background: linear-gradient(135deg, #1a73e8, #0d47a1); border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
}
.hero-value-icon svg { width: 20px; height: 20px; color: #fff; }
.hero-value strong { color: #1a73e8; display: block; font-size: 15px; }
.hero-btns { display: flex; gap: 16px; justify-content: center; }
.hero-btn-primary { background: #1a73e8; color: #fff; padding: 14px 36px; border-radius: 8px; font-size: 16px; border: none; cursor: pointer; transition: all 0.2s; font-weight: 500; }
.hero-btn-primary:hover { background: #1557b0; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(26,115,232,0.3); }
.hero-btn-secondary { background: #fff; color: #1a73e8; padding: 14px 36px; border-radius: 8px; font-size: 16px; border: 2px solid #1a73e8; cursor: pointer; transition: all 0.2s; }
.hero-btn-secondary:hover { background: #e8f0fe; transform: translateY(-1px); }

.stats-section {
    padding: 40px; background: #fff;
}
.stats-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
    max-width: 900px; margin: 0 auto;
}
.stat-item { text-align: center; }
.stat-number { font-size: 36px; font-weight: 700; color: #1a73e8; }
.stat-label { font-size: 14px; color: #888; margin-top: 4px; }

.section { padding: 80px 40px; max-width: 1100px; margin: 0 auto; }
.section-title { text-align: left; font-size: 32px; color: #1a1a1a; margin-bottom: 8px; font-weight: 700; }
.section-desc { text-align: left; font-size: 16px; color: #888; margin-bottom: 48px; max-width: 600px; line-height: 1.6; }
.section-tag {
    display: inline-block; background: #e8f0fe; color: #1a73e8;
    padding: 4px 12px; border-radius: 4px; font-size: 12px;
    margin-bottom: 12px; text-align: left; width: auto;
}

.arch-section { background: #f8f9ff; padding: 80px 40px; }
.arch-content { max-width: 800px; margin: 0 auto; }
.arch-diagram {
    max-width: 800px; margin: 0 auto; background: #fff; border-radius: 16px;
    padding: 40px; box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}
.arch-row { display: flex; justify-content: center; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.arch-box {
    padding: 10px 18px; border-radius: 8px; font-size: 14px;
    font-weight: 500; text-align: center; min-width: 100px;
    transition: transform 0.2s;
}
.arch-box:hover { transform: scale(1.05); }
.arch-box.external { background: #e8f0fe; color: #1557b0; }
.arch-box.gateway { background: linear-gradient(135deg, #1a73e8, #0d47a1); color: #fff; font-size: 16px; padding: 14px 28px; }
.arch-box.service { background: #4caf50; color: #fff; }
.arch-box.data { background: #ff9800; color: #fff; }
.arch-arrow { text-align: center; color: #1a73e8; font-size: 20px; margin: 12px 0; }

.subsystems-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.subsystem-card {
    border-radius: 12px; padding: 24px 16px; text-align: center;
    color: #fff; transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer; position: relative; overflow: hidden;
}
.subsystem-card:hover { transform: translateY(-6px); box-shadow: 0 12px 30px rgba(0,0,0,0.15); }
.subsystem-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0;
    height: 4px; background: rgba(255,255,255,0.3);
}
.subsystem-card.headquarters { background: linear-gradient(135deg, #4caf50, #2e7d32); }
.subsystem-card.merchant { background: linear-gradient(135deg, #2196f3, #1565c0); }
.subsystem-card.shop { background: linear-gradient(135deg, #ff9800, #e65100); }
.subsystem-card.warehouse { background: linear-gradient(135deg, #9c27b0, #6a1b9a); }
.subsystem-card.supplier { background: linear-gradient(135deg, #f44336, #b71c1c); }
.subsystem-card h4 { font-size: 18px; margin-bottom: 4px; }
.subsystem-card .role { font-size: 12px; opacity: 0.85; margin-bottom: 12px; }
.subsystem-card ul { font-size: 13px; list-style: none; line-height: 1.7; }
.subsystem-card ul li::before { content: "· "; opacity: 0.7; }
.subsystem-chain {
    display: flex; justify-content: center; align-items: center;
    gap: 8px; margin-top: 32px; font-size: 14px; color: #555;
}
.subsystem-chain .arrow { color: #1a73e8; font-weight: bold; }

.flow-section { background: #fff; padding: 80px 40px; }
.flow-content { max-width: 900px; margin: 0 auto; }
.flow-steps {
    display: flex; align-items: center; justify-content: center;
    gap: 0; max-width: 900px; margin: 0 auto; flex-wrap: wrap;
}
.flow-step {
    flex: 1; min-width: 120px; text-align: center; padding: 20px 8px;
    position: relative;
}
.flow-step-icon {
    width: 56px; height: 56px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 12px; font-size: 24px;
    transition: transform 0.2s;
}
.flow-step:hover .flow-step-icon { transform: scale(1.1); }
.flow-step h4 { font-size: 14px; color: #1a1a1a; margin-bottom: 4px; }
.flow-step p { font-size: 12px; color: #888; }
.flow-arrow {
    font-size: 20px; color: #1a73e8; padding: 20px 0;
    font-weight: bold;
}

.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
    background: #f8f9ff; border-radius: 12px; padding: 28px;
    border: 1px solid #e8eaf6; transition: transform 0.3s, box-shadow 0.3s;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: 0 8px 24px rgba(26,115,232,0.12); }
.feature-icon {
    width: 48px; height: 48px; background: linear-gradient(135deg, #1a73e8, #0d47a1); border-radius: 10px;
    display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
}
.feature-icon svg { width: 24px; height: 24px; color: #fff; }
.feature-card h3 { font-size: 18px; color: #1a1a1a; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: #666; line-height: 1.6; }
.feature-card .feature-link { font-size: 13px; color: #1a73e8; margin-top: 12px; display: inline-block; }

.ai-section { background: #1a1a2e; padding: 80px 40px; color: #fff; position: relative; overflow: hidden; }
.ai-section::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, rgba(26,115,232,0.1) 0%, rgba(156,39,176,0.1) 100%);
}
.ai-content { position: relative; max-width: 1100px; margin: 0 auto; }
.ai-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.ai-left h2 { font-size: 32px; color: #fff; margin-bottom: 16px; }
.ai-left p { font-size: 16px; color: rgba(255,255,255,0.7); line-height: 1.7; margin-bottom: 24px; }
.ai-features { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.ai-feature {
    background: rgba(255,255,255,0.08); padding: 20px; border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.1); transition: transform 0.2s;
}
.ai-feature:hover { transform: translateY(-4px); }
.ai-feature h4 { font-size: 16px; color: #1a73e8; margin-bottom: 6px; }
.ai-feature p { font-size: 13px; color: rgba(255,255,255,0.6); }
.ai-demo {
    background: rgba(0,0,0,0.4); border-radius: 12px; padding: 24px;
    font-family: 'Courier New', monospace; font-size: 14px;
    border: 1px solid rgba(26,115,232,0.3);
}
.ai-demo .prompt { color: #4caf50; }
.ai-demo .cmd { color: #1a73e8; }
.ai-demo .result { color: rgba(255,255,255,0.7); }
.ai-demo .comment { color: #ff9800; }

.shipping-section { background: #f8f9ff; padding: 80px 40px; }
.shipping-content { max-width: 900px; margin: 0 auto; }
.shipping-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 900px; margin: 0 auto; }
.shipping-card {
    background: #fff; border-radius: 12px; padding: 28px; text-align: center;
    border: 2px solid #e8eaf6; transition: transform 0.3s, border-color 0.3s;
}
.shipping-card:hover { transform: translateY(-6px); border-color: #1a73e8; }
.shipping-icon { font-size: 40px; margin-bottom: 16px; }
.shipping-card h4 { font-size: 18px; color: #1a1a1a; margin-bottom: 8px; }
.shipping-card p { font-size: 13px; color: #888; line-height: 1.6; }
.shipping-card ul { font-size: 13px; color: #666; list-style: none; margin-top: 12px; line-height: 1.8; }
.shipping-card ul li::before { content: "✓ "; color: #1a73e8; }

.scenarios-section { padding: 80px 40px; max-width: 900px; margin: 0 auto; }
.scenarios-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.scenario-card {
    background: #f8f9ff; border-radius: 12px; padding: 32px;
    border: 1px solid #e8eaf6; transition: transform 0.2s, box-shadow 0.2s;
    display: flex; gap: 16px; align-items: flex-start;
}
.scenario-card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(26,115,232,0.1); }
.scenario-icon {
    width: 48px; height: 48px; background: linear-gradient(135deg, #1a73e8, #0d47a1); border-radius: 10px;
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.scenario-icon svg { width: 24px; height: 24px; color: #fff; }
.scenario-card h4 { font-size: 17px; color: #1a1a1a; margin-bottom: 8px; }
.scenario-card p { font-size: 14px; color: #666; line-height: 1.6; }

.platforms { background: #fff; padding: 80px 40px; }
.platforms-content { max-width: 900px; margin: 0 auto; }
.platform-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 900px; margin: 0 auto; }
.platform-item {
    background: #f8f9ff; padding: 20px; border-radius: 10px;
    text-align: center; font-size: 15px; color: #333;
    border: 1px solid #e8eaf6; transition: all 0.2s;
}
.platform-item:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.1); border-color: #1a73e8; color: #1a73e8; }

.tech-section { background: #1a1a1a; padding: 80px 40px; color: #fff; }
.tech-content { max-width: 800px; margin: 0 auto; }
.tech-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; max-width: 800px; margin: 0 auto; }
.tech-block h4 { font-size: 18px; color: #1a73e8; margin-bottom: 16px; }
.tech-list { font-size: 14px; line-height: 2; }
.tech-list span { color: #fff; font-weight: 500; }
.tech-list em { color: #aaa; font-style: normal; margin-left: 8px; }

.pricing-section { background: #f8f9ff; padding: 80px 40px; }
.pricing-content { max-width: 900px; margin: 0 auto; }
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 900px; margin: 0 auto; }
.pricing-card {
    background: #fff; border-radius: 12px; padding: 32px;
    border: 2px solid #e8eaf6; text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(26,115,232,0.1); }
.pricing-card.highlight { border-color: #1a73e8; position: relative; }
.pricing-card.highlight::before {
    content: "推荐"; position: absolute; top: -12px; left: 50%;
    transform: translateX(-50%); background: #1a73e8; color: #fff;
    padding: 4px 12px; border-radius: 4px; font-size: 12px;
}
.pricing-card h4 { font-size: 20px; color: #333; margin-bottom: 8px; }
.pricing-price { font-size: 28px; font-weight: bold; color: #1a73e8; margin-bottom: 4px; }
.pricing-unit { font-size: 14px; color: #888; margin-bottom: 20px; }
.pricing-features { list-style: none; font-size: 14px; color: #555; }
.pricing-features li { padding: 6px 0; }
.pricing-features li::before { content: "✓ "; color: #1a73e8; }
.pricing-btn { display: inline-block; margin-top: 20px; padding: 10px 24px; border-radius: 6px; font-size: 14px; cursor: pointer; transition: all 0.2s; }
.pricing-btn-primary { background: #1a73e8; color: #fff; border: none; }
.pricing-btn-primary:hover { background: #1557b0; }
.pricing-btn-secondary { background: #fff; color: #1a73e8; border: 2px solid #1a73e8; }
.pricing-btn-secondary:hover { background: #e8f0fe; }

.cta {
    padding: 80px 40px; text-align: center;
    background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%); color: #fff;
}
.cta h2 { font-size: 32px; margin-bottom: 12px; }
.cta p { font-size: 16px; color: rgba(255,255,255,0.8); margin-bottom: 24px; max-width: 480px; margin-left: auto; margin-right: auto; }
.cta-btn { background: #fff; color: #1a73e8; padding: 14px 36px; border-radius: 8px; font-size: 16px; border: none; cursor: pointer; transition: all 0.2s; font-weight: 500; }
.cta-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255,255,255,0.2); }

.footer {
    padding: 40px; background: #1a1a1a; color: #aaa;
}
.footer-inner {
    display: flex; justify-content: space-between; align-items: center; font-size: 14px;
    max-width: 1100px; margin: 0 auto;
}
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: #aaa; transition: color 0.2s; }
.footer-links a:hover { color: #fff; }
.footer-contact { color: #ccc; }
.footer-contact strong { color: #fff; }

@media (max-width: 768px) {
    .nav { padding: 0 20px; }
    .nav-links { display: none; }
    .hero h1 { font-size: 28px; }
    .hero-values { flex-direction: column; align-items: center; }
    .hero-btns { flex-direction: column; align-items: center; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .subsystems-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .shipping-grid { grid-template-columns: 1fr; }
    .scenarios-grid { grid-template-columns: 1fr; }
    .platform-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .ai-grid { grid-template-columns: 1fr; }
    .flow-steps { flex-direction: column; }
    .flow-arrow { transform: rotate(90deg); }
    .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
}
@media (min-width: 769px) and (max-width: 1024px) {
    .subsystems-grid { grid-template-columns: repeat(3, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .scenarios-grid { grid-template-columns: 1fr; }
}

.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s, transform 0.6s; }
.fade-in.visible { opacity: 1; transform: translateY(0); }