* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: #333;
    line-height: 1.6;
    background: #fff;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

.btn {
    display: inline-block;
    padding: 6px 20px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.25s ease;
    text-align: center;
}
.btn-primary { background: #0a2a6b; color: #fff; border-color: #0a2a6b; }
.btn-primary:hover { background: #071f4d; border-color: #071d45; }
.btn-outline { background: transparent; color: #fff; border-color: #fff; }
.btn-outline:hover { background: #fff; color: #0a2a6b; }

.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(8px);
    transition: all 0.3s ease;
    border-bottom: 1px solid transparent;
}
.navbar.scrolled {
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    border-bottom-color: #eee;
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-img {
    height: 36px;
    width: auto;
    display: block;
}
.logo-text { font-size: 17px; font-weight: 600; color: #0a2a6b; }
.nav-links { display: flex; gap: 28px; }
.nav-links a {
    color: #555;
    font-size: 14px;
    font-weight: 500;
    position: relative;
    transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: #0a2a6b; }
.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -6px; left: 0; right: 0;
    height: 2px;
    background: #0a2a6b;
    border-radius: 1px;
}
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}
.nav-toggle span {
    width: 24px; height: 2px;
    background: #333;
    transition: 0.3s;
}

.hero {
    position: relative;
    height: 56px;
    display: flex;
    align-items: center;
    color: #fff;
    overflow: hidden;
    margin-top: 64px;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #0a2a6b 0%, #1a56db 100%);
    z-index: 0;
}
.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(255,255,255,0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.06) 0%, transparent 50%);
}
.hero-content {
    position: relative;
    z-index: 1;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.hero h1 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
}
.hero-btns { display: flex; gap: 10px; }

.section { padding: 70px 0; }
.section-gray { background: #f7f9fc; }
.section-head { text-align: center; margin-bottom: 48px; }
.section-tag {
    display: inline-block;
    font-size: 13px;
    letter-spacing: 3px;
    color: #0a2a6b;
    font-weight: 600;
    margin-bottom: 10px;
}
.section-head h2 {
    font-size: 30px;
    font-weight: 700;
    color: #1a2233;
    margin-bottom: 10px;
}
.section-desc { color: #6b7c93; font-size: 15px; }

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}
.about-text h3 {
    font-size: 22px;
    color: #1a2233;
    margin-bottom: 14px;
}
.about-text p {
    color: #5a6a7e;
    margin-bottom: 12px;
    line-height: 1.9;
    font-size: 15px;
}
.core-values {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #eef1f5;
}
.value-item { margin-bottom: 16px; }
.value-title {
    font-size: 14px;
    font-weight: 600;
    color: #0a2a6b;
    margin-bottom: 4px;
}
.value-desc {
    font-size: 15px;
    color: #1a2233;
    line-height: 1.7;
}
.about-img .img-placeholder {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 12px 40px rgba(10,42,107,0.12);
}
.about-img img { display: block; width: 100%; height: auto; }

.timeline-section {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid #eef1f5;
}
.timeline-title {
    text-align: center;
    font-size: 24px;
    color: #1a2233;
    margin-bottom: 36px;
}
.timeline {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.timeline-item {
    background: #fff;
    border: 1px solid #eef1f5;
    border-radius: 10px;
    padding: 24px;
    transition: all 0.3s ease;
}
.timeline-item:hover {
    border-color: #0a2a6b;
    box-shadow: 0 8px 24px rgba(10,42,107,0.1);
}
.timeline-year {
    font-size: 20px;
    font-weight: 700;
    color: #0a2a6b;
    margin-bottom: 8px;
}
.timeline-content h4 {
    font-size: 16px;
    color: #1a2233;
    margin-bottom: 6px;
}
.timeline-content p {
    font-size: 14px;
    color: #6b7c93;
    line-height: 1.7;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.service-card {
    background: #fff;
    padding: 28px 24px;
    border-radius: 10px;
    border: 1px solid #eef1f5;
    transition: all 0.3s ease;
}
.service-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(10,42,107,0.12);
    border-color: #a3b8d8;
}
.service-icon {
    width: 48px; height: 48px;
    color: #0a2a6b;
    margin-bottom: 16px;
}
.service-icon svg { width: 100%; height: 100%; }
.service-card h3 {
    font-size: 17px;
    color: #1a2233;
    margin-bottom: 10px;
}
.service-card p {
    color: #6b7c93;
    font-size: 14px;
    line-height: 1.8;
}

.tech-section {
    margin-top: 48px;
    padding-top: 40px;
    border-top: 1px solid #eef1f5;
}
.tech-title {
    text-align: center;
    font-size: 24px;
    color: #1a2233;
    margin-bottom: 32px;
}
.tech-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.tech-card {
    background: #fff;
    padding: 28px;
    border-radius: 10px;
    border: 1px solid #eef1f5;
    border-left: 4px solid #0a2a6b;
}
.tech-card h4 {
    font-size: 17px;
    color: #1a2233;
    margin-bottom: 10px;
}
.tech-card p {
    color: #6b7c93;
    font-size: 14px;
    line-height: 1.8;
}

.adv-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.adv-card {
    background: #fff;
    padding: 28px 20px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid #eef1f5;
    transition: all 0.3s ease;
}
.adv-card:hover {
    border-color: #0a2a6b;
    box-shadow: 0 8px 24px rgba(10,42,107,0.1);
}
.adv-num {
    font-size: 32px;
    font-weight: 800;
    color: #dbe4f0;
    margin-bottom: 10px;
    line-height: 1;
}
.adv-card h3 {
    font-size: 16px;
    color: #1a2233;
    margin-bottom: 8px;
}
.adv-card p {
    color: #6b7c93;
    font-size: 13px;
    line-height: 1.7;
}

.network-section {
    margin-top: 48px;
    padding-top: 40px;
    border-top: 1px solid #eef1f5;
}
.network-title {
    text-align: center;
    font-size: 24px;
    color: #1a2233;
    margin-bottom: 32px;
}
.network-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.network-card {
    background: #fff;
    padding: 28px;
    border-radius: 10px;
    border: 1px solid #eef1f5;
    text-align: center;
    transition: all 0.3s ease;
}
.network-card:hover {
    border-color: #0a2a6b;
    box-shadow: 0 8px 24px rgba(10,42,107,0.1);
}
.network-card h4 {
    font-size: 17px;
    color: #1a2233;
    margin-bottom: 10px;
}
.network-card p {
    color: #6b7c93;
    font-size: 14px;
    line-height: 1.8;
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
}
.client-card {
    background: #fff;
    padding: 32px 20px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid #eef1f5;
    transition: all 0.3s ease;
}
.client-card:hover {
    transform: translateY(-4px);
    border-color: #0a2a6b;
    box-shadow: 0 8px 24px rgba(10,42,107,0.1);
}
.client-icon {
    font-size: 40px;
    margin-bottom: 12px;
}
.client-card h3 {
    font-size: 15px;
    color: #1a2233;
}

.contact-info-row {
    display: flex;
    justify-content: center;
    gap: 60px;
    max-width: 800px;
    margin: 0 auto;
}
.contact-item {
    display: flex;
    gap: 16px;
    align-items: center;
}
.contact-icon {
    width: 44px; height: 44px;
    min-width: 44px;
    background: #dbe4f0;
    color: #0a2a6b;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.contact-icon svg { width: 22px; height: 22px; }
.contact-label {
    font-size: 13px;
    color: #8a99ab;
    margin-bottom: 4px;
}
.contact-value {
    font-size: 16px;
    color: #1a2233;
    font-weight: 500;
}

.footer { background: #1a2233; color: #aab4c4; }
.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding: 48px 24px;
}
.footer-brand .logo-text { color: #fff; }
.footer-brand .logo-img { height: 32px; margin-bottom: 8px; }
.footer-brand p { margin-top: 14px; font-size: 14px; line-height: 1.8; }
.footer-links h4, .footer-contact h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 16px;
}
.footer-links a {
    display: block;
    color: #aab4c4;
    font-size: 14px;
    margin-bottom: 10px;
    transition: color 0.2s;
}
.footer-links a:hover { color: #fff; }
.footer-contact p { font-size: 14px; margin-bottom: 10px; }
.footer-bottom {
    border-top: 1px solid #2a3447;
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
}

@media (max-width: 960px) {
    .about-grid { grid-template-columns: 1fr; gap: 36px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .adv-grid { grid-template-columns: repeat(2, 1fr); }
    .network-grid { grid-template-columns: repeat(2, 1fr); }
    .clients-grid { grid-template-columns: repeat(3, 1fr); }
    .timeline { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 18px; }
    .section-head h2 { font-size: 26px; }
}

@media (max-width: 720px) {
    .contact-info-row { flex-direction: column; gap: 20px; }
    .nav-toggle { display: flex; }
    .nav-links {
        position: fixed;
        top: 64px; left: 0; right: 0;
        background: #fff;
        flex-direction: column;
        padding: 16px 24px;
        gap: 0;
        box-shadow: 0 4px 16px rgba(0,0,0,0.08);
        transform: translateY(-120%);
        transition: transform 0.3s ease;
    }
    .nav-links.open { transform: translateY(0); }
    .nav-links a {
        padding: 12px 0;
        border-bottom: 1px solid #f0f2f5;
    }
    .nav-links a.active::after { display: none; }
    .hero { height: 48px; margin-top: 64px; }
    .hero h1 { font-size: 16px; }
    .hero-btns .btn { padding: 4px 12px; font-size: 12px; }
    .section { padding: 50px 0; }
    .services-grid, .adv-grid, .network-grid, .timeline { grid-template-columns: 1fr; }
    .clients-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1fr; gap: 28px; }
}