:root {
    --primary-color: #1a56db;
    --secondary-color: #0e9f6e;
    --accent-color: #7e3af2;
    --light-color: #f9fafb;
    --dark-color: #1f2a37;
    --text-color: #333;
    --border-color: #e5e7eb;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f5f7fa;
    color: var(--text-color);
    line-height: 1.6;
    position: relative;
    min-height: 100%;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero {
    background: linear-gradient(rgba(26, 86, 219, 0.9), rgba(126, 58, 242, 0.8)), url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="400" viewBox="0 0 1200 400"><rect width="1200" height="400" fill="%231a56db"/><path d="M0,200 Q300,100 600,200 T1200,200 L1200,400 L0,400 Z" fill="%230e9f6e" opacity="0.2"/><path d="M0,300 Q300,250 600,300 T1200,300 L1200,400 L0,400 Z" fill="%237e3af2" opacity="0.1"/></svg>') no-repeat center center;
    background-size: cover;
    color: white;
    padding: 80px 0;
    text-align: center;
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 42px;
    margin-bottom: 20px;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

.hero p {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.9;
}

.hero .btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--secondary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: all 0.3s;
    border: none;
    cursor: default;
}

.hero .btn:hover {
    background-color: #0a7c55;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* 主要内容区域 */
.main-content {
    padding: 40px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

.section-title h2 {
    font-size: 32px;
    color: var(--primary-color);
    display: inline-block;
    padding-bottom: 10px;
}

.section-title h2:after {
    content: '';
    position: absolute;
    width: 80px;
    height: 3px;
    background-color: var(--secondary-color);
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.card {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.card-header {
    background-color: var(--primary-color);
    color: white;
    padding: 15px 20px;
    font-weight: bold;
    font-size: 18px;
}

.card-body {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-body ul {
    list-style-type: none;
    margin-bottom: 20px;
}

.card-body li {
    padding: 8px 0;
    border-bottom: 1px solid #f0f0f0;
    position: relative;
    padding-left: 20px;
}

.card-body li a {
    color: var(--text-color);
}

.card-body li a:hover {
    color: var(--primary-color);
}

.card-body li:before {
    content: '•';
    color: var(--secondary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.card-footer {
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-top: 1px solid #e9ecef;
    margin-top: auto;
}

.card-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
}

.card-link:hover {
    text-decoration: underline;
}

.card-link:after {
    content: '→';
    margin-left: 5px;
    transition: transform 0.3s;
}

.card-link:hover:after {
    transform: translateX(3px);
}

/* 特色展示区域 */
.feature-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.feature-item {
    background: white;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.feature-item h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.feature-item h3:before {
    content: '★';
    margin-right: 10px;
    color: var(--secondary-color);
}

.feature-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.feature-link {
    display: block;
    padding: 10px 15px;
    background-color: #f0f4f8;
    border-radius: 5px;
    text-decoration: none;
    color: var(--dark-color);
    transition: all 0.3s;
    border-left: 3px solid var(--primary-color);
}

.feature-link:hover {
    background-color: #e2e8f0;
    transform: translateX(5px);
}

/* 时间轴样式 */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    margin-bottom: 70px;
}

.timeline:before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--primary-color);
    transform: translateX(-50%);
}

.timeline-item {
    margin-bottom: 40px;
    position: relative;
    width: 50%;
    padding: 0 40px;
}

.timeline-item:nth-child(odd) {
    left: 0;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-content {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    position: relative;
}

.timeline-content a {
    color: var(--text-color);
}

.timeline-content a:hover {
    color: var(--primary-color);
}

.timeline-content:after {
    content: '';
    position: absolute;
    top: 20px;
    width: 0;
    height: 0;
    border-style: solid;
}

.timeline-item:nth-child(odd) .timeline-content:after {
    right: -10px;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent white;
}

.timeline-item:nth-child(even) .timeline-content:after {
    left: -10px;
    border-width: 10px 10px 10px 0;
    border-color: transparent white transparent transparent;
}

.timeline-dot {
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: var(--secondary-color);
    border-radius: 50%;
    top: 20px;
    right: -10px;
    z-index: 1;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -10px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .timeline:before {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 50px;
        padding-right: 0;
    }

    .timeline-item:nth-child(even) {
        left: 0;
    }

    .timeline-dot {
        left: 10px !important;
        right: auto;
    }

    .timeline-content:after {
        display: none;
    }

    .feature-showcase {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero p {
        font-size: 16px;
    }
}

/* H-AI-HAI(人机协同)·以人为本 */
.special-feature {
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border-radius: 12px;
    padding: 30px;
    margin: 40px 0;
    border-left: 5px solid var(--primary-color);
}

.special-feature h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

.special-feature h2:before {
    content: '✨';
    margin-right: 10px;
    font-size: 24px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.feature-box {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
}

.feature-box:hover {
    transform: translateY(-5px);
}

.feature-box h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 5px;
}

.feature-links a {
    display: block;
    padding: 8px 0;
    color: var(--dark-color);
    text-decoration: none;
    transition: color 0.3s;
    border-left: 3px solid transparent;
    padding-left: 10px;
}

.feature-links a:hover {
    color: var(--primary-color);
    border-left: 3px solid var(--primary-color);
}