/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC", "Microsoft Yahei", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    font-weight: 400;
    color: #1f2937;
    background: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

a { text-decoration: none; color: inherit; transition: all 0.25s ease; }

/* === 顶部导航 === */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    height: 60px;
}

.nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: #1e3a5f;
}

.nav-logo { color: #f5a623; }

.nav-btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: #1e3a5f;
    background: rgba(30, 58, 95, 0.06);
    transition: all 0.2s ease;
}
.nav-btn:hover { background: rgba(30, 58, 95, 0.12); color: #1e3a5f; }

/* === Hero 区域 === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 80px 24px 60px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(160deg, #0f2439 0%, #1e3a5f 35%, #2d4a6f 65%, #1a3355 100%);
    z-index: 0;
}
.hero-bg::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 700px;
    height: 700px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(245, 166, 35, 0.15) 0%, transparent 70%);
}
.hero-bg::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -15%;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(24, 144, 255, 0.1) 0%, transparent 70%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 640px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 20px;
    background: rgba(245, 166, 35, 0.15);
    color: #f5a623;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 24px;
    border: 1px solid rgba(245, 166, 35, 0.25);
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: 3px;
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 4px;
    margin-bottom: 12px;
}

.hero-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 36px;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #f5a623 0%, #ffb84d 100%);
    color: #1e3a5f;
    box-shadow: 0 4px 20px rgba(245, 166, 35, 0.35);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(245, 166, 35, 0.45);
    color: #1e3a5f;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.35);
    transform: translateY(-2px);
    color: #ffffff;
}

/* Hero 统计数字 */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    padding: 28px 36px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(8px);
}

.stat-item { text-align: center; }

.stat-num {
    font-size: 32px;
    font-weight: 800;
    color: #f5a623;
    letter-spacing: -1px;
}

.stat-unit {
    font-size: 14px;
    font-weight: 600;
    color: #f5a623;
}

.stat-label {
    display: block;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.45);
    margin-top: 4px;
    letter-spacing: 1px;
}

.stat-divider {
    width: 1px;
    height: 36px;
    background: rgba(255, 255, 255, 0.12);
}

/* === 通用 Section === */
.section-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-head {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: #1e3a5f;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.section-desc {
    font-size: 16px;
    color: #6b7280;
    margin: 0;
}

/* === 服务项目 === */
.services {
    padding: 80px 0;
    background: #f8f9fb;
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: #ffffff;
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.04);
}
.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.service-icon {
    width: 60px;
    height: 60px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.si-red    { background: #fff1ec; color: #FF6B35; }
.si-teal   { background: #e6faf8; color: #4ECDC4; }
.si-blue   { background: #e8f4fd; color: #45B7D1; }
.si-green  { background: #ecf8f0; color: #52c41a; }
.si-amber  { background: #fef6e8; color: #D4A574; }
.si-danger { background: #fdedef; color: #E74C3C; }

.service-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 10px;
}

.service-card p {
    font-size: 14px;
    color: #6b7280;
    line-height: 1.6;
    margin: 0;
}

/* === 为什么选择我们 === */
.features {
    padding: 80px 0;
    background: #ffffff;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-item {
    padding: 32px 24px;
    border-radius: 16px;
    background: #f8f9fb;
    border: 1px solid transparent;
    transition: all 0.3s ease;
}
.feature-item:hover {
    border-color: rgba(30, 58, 95, 0.1);
    background: #ffffff;
    box-shadow: 0 8px 30px rgba(30, 58, 95, 0.06);
}

.feature-num {
    font-size: 36px;
    font-weight: 800;
    color: rgba(30, 58, 95, 0.08);
    margin-bottom: 16px;
    line-height: 1;
}

.feature-item h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1e3a5f;
    margin-bottom: 10px;
}

.feature-item p {
    font-size: 14px;
    color: #6b7280;
    line-height: 1.7;
    margin: 0;
}

/* === CTA 区域 === */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, #1e3a5f 0%, #2d4a6f 100%);
    text-align: center;
}

.cta h2 {
    font-size: 30px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 12px;
}

.cta p {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 32px;
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 36px;
    background: linear-gradient(135deg, #f5a623 0%, #ffb84d 100%);
    color: #1e3a5f;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 700;
    box-shadow: 0 4px 24px rgba(245, 166, 35, 0.3);
    transition: all 0.25s ease;
}
.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(245, 166, 35, 0.45);
    color: #1e3a5f;
}

/* === 页脚 === */
.footer {
    background: #0f1a2e;
    padding: 32px 0;
    text-align: center;
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
}

.footer-copy {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.3);
    margin: 0;
}
.footer-copy a {
    color: rgba(255, 255, 255, 0.4);
}
.footer-copy a:hover {
    color: rgba(255, 255, 255, 0.6);
}

/* === 响应式 === */
@media (max-width: 768px) {
    .hero-title { font-size: 34px; }
    .hero-subtitle { font-size: 15px; letter-spacing: 2px; }
    .hero-desc { font-size: 14px; }

    .hero-stats {
        flex-direction: column;
        gap: 16px;
        padding: 24px;
    }
    .stat-divider {
        width: 60px;
        height: 1px;
    }

    .service-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .section-title { font-size: 26px; }
    .services, .features, .cta { padding: 60px 0; }
    .cta h2 { font-size: 24px; }
}

@media (max-width: 480px) {
    .hero { padding: 80px 20px 48px; min-height: auto; }
    .hero-title { font-size: 30px; letter-spacing: 2px; }
    .hero-actions { flex-direction: column; align-items: center; }
    .btn-primary, .btn-secondary { width: 100%; max-width: 280px; justify-content: center; }

    .hero-stats {
        flex-direction: row;
        gap: 12px;
        padding: 20px 16px;
    }
    .stat-divider { width: 1px; height: 30px; }
    .stat-num { font-size: 24px; }
    .stat-unit { font-size: 12px; }

    .service-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .service-card { padding: 24px 16px; }
    .service-card h3 { font-size: 16px; }
    .service-card p { font-size: 13px; }

    .feature-grid { grid-template-columns: 1fr; gap: 12px; }
}