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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #0f172a;
    --text: #334155;
    --text-light: #64748b;
    --bg: #f8fafc;
    --white: #ffffff;
    --border: #e2e8f0;
    --card-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
    --card-shadow-hover: 0 16px 40px rgba(37, 99, 235, 0.10);
    --max-width: 1240px;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: #ffffff;
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul, li {
    list-style: none;
}

.about-container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 90px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 55px;
}

.section-tag {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 999px;
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 18px;
}

.section-title {
    font-size: 38px;
    line-height: 1.25;
    font-weight: 800;
    color: var(--secondary);
    margin-bottom: 16px;
}

.section-desc {
    max-width: 760px;
    margin: 0 auto;
    font-size: 16px;
    color: var(--text-light);
}

.hero {
    position: relative;
    overflow: hidden;
    padding: 110px 0 90px;
    background:
            radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.08), transparent 30%),
            radial-gradient(circle at 90% 10%, rgba(59, 130, 246, 0.08), transparent 28%),
            linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
    border-bottom: 1px solid #eef2f7;
}

.hero-grid,
.about-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 50px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    border-radius: 999px;
    background: rgba(37,99,235,0.06);
    border: 1px solid rgba(37,99,235,0.08);
    color: var(--primary);
    font-size: 14px;
    margin-bottom: 22px;
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22c55e;
    box-shadow: 0 0 0 6px rgba(34,197,94,0.12);
}

.hero-title {
    font-size: 52px;
    line-height: 1.18;
    font-weight: 800;
    margin-bottom: 22px;
    color: var(--secondary);
}

.hero-title span {
    color: var(--primary);
}

.hero-desc {
    font-size: 17px;
    color: var(--text-light);
    max-width: 650px;
    margin-bottom: 34px;
}

.hero-actions,
.cta-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 150px;
    height: 50px;
    padding: 0 26px;
    border-radius: 14px;
    font-size: 15px;
    font-weight: 700;
    transition: all .25s ease;
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary, .btn-white {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    color: #fff;
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.18);
}

.btn-outline, .btn-dark-outline {
    border-color: #dbeafe;
    background: #fff;
    color: var(--primary);
}

.btn:hover {
    transform: translateY(-2px);
}

.hero-panel,
.about-card,
.feature-card,
.timeline-card,
.stat-card,
.service-card,
.culture-card,
.mini-box {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: var(--card-shadow);
    transition: all .28s ease;
}

.hero-panel {
    padding: 28px;
    border-radius: 28px;
    box-shadow: 0 20px 60px rgba(37, 99, 235, 0.08);
}

.hero-panel:hover,
.mini-box:hover,
.feature-card:hover,
.service-card:hover,
.culture-card:hover,
.stat-card:hover,
.timeline-card:hover,
.about-card:hover,
.mini-box:hover {
    transform: translateY(-6px);
    box-shadow: var(--card-shadow-hover);
}

.panel-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.panel-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--secondary);
}

.panel-status {
    font-size: 13px;
    color: var(--primary);
    background: rgba(37,99,235,0.08);
    border: 1px solid rgba(37,99,235,0.10);
    padding: 6px 12px;
    border-radius: 999px;
}

.server-cards,
.about-list,
.service-card ul {
    display: grid;
    gap: 16px;
}

.server-card {
    background: #f8fbff;
    border: 1px solid #e8f0ff;
    border-radius: 18px;
    padding: 18px;
    transition: all .25s ease;
}

.server-card:hover {
    transform: translateY(-4px);
}

.server-card h4,
.feature-card h4,
.service-card h4,
.culture-card h4 {
    color: var(--secondary);
}

.server-card h4 {
    font-size: 16px;
    margin-bottom: 8px;
}

.server-card p,
.feature-card p,
.service-card p,
.culture-card p,
.timeline-card p {
    color: var(--text-light);
    font-size: 15px;
}

.server-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.server-meta span {
    font-size: 12px;
    color: var(--primary);
    background: rgba(59,130,246,0.08);
    border: 1px solid rgba(96,165,250,0.12);
    padding: 6px 10px;
    border-radius: 999px;
}

.about-card {
    padding: 36px;
}

.about-card h3 {
    font-size: 30px;
    line-height: 1.3;
    color: var(--secondary);
    margin-bottom: 18px;
}

.about-card p {
    color: var(--text-light);
    margin-bottom: 16px;
    font-size: 15px;
}

.about-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: var(--text);
    font-size: 15px;
}

.about-list li::before {
    content: "✓";
    flex: 0 0 26px;
    width: 26px;
    height: 26px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(37,99,235,0.1);
    color: var(--primary);
    font-weight: 700;
}

.about-visual,
.feature-grid,
.culture-grid,
.stats-grid {
    display: grid;
    gap: 22px;
}

.about-visual {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.feature-grid,
.culture-grid,
.stats-grid {
    grid-template-columns: repeat(4, 1fr);
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.mini-box,
.feature-card,
.culture-card,
.service-card,
.stat-card {
    padding: 28px 24px;
}

.mini-box strong,
.stat-num {
    display: block;
    color: var(--secondary);
    font-weight: 800;
}

.mini-box strong {
    font-size: 32px;
    margin-bottom: 8px;
}

.mini-box span,
.stat-text {
    font-size: 15px;
    color: var(--text-light);
}

.features,
.culture,
.stats {
    background: var(--bg);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(37,99,235,0.10), rgba(59,130,246,0.16));
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 18px;
}

.feature-card h4,
.service-card h4,
.culture-card h4 {
    font-size: 20px;
    margin-bottom: 12px;
}

.timeline-wrapper {
    position: relative;
    max-width: 980px;
    margin: 0 auto;
}

.timeline-wrapper::before {
    content: "";
    position: absolute;
    left: 26px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, #bfdbfe, #2563eb);
}

.timeline-item {
    position: relative;
    padding-left: 78px;
    margin-bottom: 38px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: 14px;
    top: 6px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: #fff;
    border: 6px solid var(--primary);
    box-shadow: 0 0 0 8px rgba(37,99,235,0.08);
}

.timeline-card {
    padding: 26px 28px;
}

.timeline-year {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(37,99,235,0.08);
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
}

.stat-num {
    font-size: 40px;
    color: var(--primary);
    margin-bottom: 10px;
}

.service-card li {
    font-size: 14px;
    color: var(--text);
    position: relative;
    padding-left: 18px;
}

.service-card li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
}

.culture-card {
    text-align: center;
}

.culture-card .emoji {
    font-size: 34px;
    margin-bottom: 14px;
}

.cta {
    padding: 90px 0 110px;
}

.cta-box {
    background: linear-gradient(135deg, #f8fbff 0%, #ffffff 100%);
    border: 1px solid #dbeafe;
    border-radius: 34px;
    padding: 56px 42px;
    color: var(--secondary);
    box-shadow: 0 25px 80px rgba(37, 99, 235, 0.08);
}

.cta-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
    flex-wrap: wrap;
}

.cta-content h2 {
    font-size: 38px;
    line-height: 1.3;
    margin-bottom: 14px;
}

.cta-content p {
    color: var(--text-light);
    font-size: 16px;
    max-width: 700px;
}

/* 动画类 */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: all .8s cubic-bezier(.2,.8,.2,1);
}

.fade-up.show {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: .08s; }
.delay-2 { transition-delay: .16s; }
.delay-3 { transition-delay: .24s; }

@media (max-width: 1100px) {
    .hero-grid,
    .about-grid {
        grid-template-columns: 1fr;
    }

    .feature-grid,
    .culture-grid,
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    .section {
        padding: 70px 0;
    }

    .hero {
        padding: 90px 0 70px;
    }

    .hero-title {
        font-size: 36px;
    }

    .section-title,
    .cta-content h2 {
        font-size: 30px;
    }

    .about-card,
    .hero-panel,
    .cta-box {
        padding: 28px 22px;
    }

    .feature-grid,
    .service-grid,
    .culture-grid,
    .stats-grid,
    .about-visual {
        grid-template-columns: 1fr;
    }

    .timeline-item {
        padding-left: 64px;
    }

    .timeline-wrapper::before {
        left: 20px;
    }

    .timeline-dot {
        left: 8px;
    }

    .btn {
        width: 100%;
    }

    .hero-actions,
    .cta-btns {
        width: 100%;
    }
}