/* 中建国际智能建造信息网站 - 主样式表 */

/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1e40af;
    --primary-light: #3b82f6;
    --primary-dark: #1e3a8a;
    --secondary-color: #059669;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
}

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

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    color: white;
}

.navbar-logo {
    width: 50px;
    height: 50px;
    background: white;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--primary-color);
    font-size: 14px;
}

.navbar-title {
    font-size: 20px;
    font-weight: 600;
}

.navbar-subtitle {
    font-size: 12px;
    opacity: 0.8;
}

.navbar-menu {
    display: flex;
    gap: 4px;
}

.navbar-menu a {
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s;
}

.navbar-menu a:hover,
.navbar-menu a.active {
    background: rgba(255, 255, 255, 0.2);
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
}

/* Hero 区域 */
.hero {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    color: white;
    padding: 80px 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: pulse 15s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 32px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
}

.btn-primary {
    background: white;
    color: var(--primary-color);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-outline:hover {
    background: white;
    color: var(--primary-color);
}

/* 主内容区 */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

/* 卡片样式 */
.card {
    background: var(--bg-white);
    border-radius: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all 0.3s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: 1.5rem;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.card-body {
    padding: 1.5rem;
}

/* 网格布局 */
.grid {
    display: grid;
    gap: 2rem;
}

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

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

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

/* 特色卡片 */
.feature-card {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: white;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.feature-desc {
    color: var(--text-light);
    font-size: 14px;
}

/* 统计数据 */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin: 3rem 0;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    background: var(--bg-white);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-light);
    font-size: 14px;
}

/* 表格样式 */
.table-container {
    overflow-x: auto;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin: 1rem 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    color: white;
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
}

td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

tr:nth-child(even) {
    background: var(--bg-light);
}

tr:hover {
    background: #eff6ff;
}

/* 章节标题 */
.section {
    margin-bottom: 4rem;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--text-light);
    font-size: 16px;
}

/* 时间线 */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--primary-light);
}

.timeline-item {
    position: relative;
    padding-bottom: 2rem;
    padding-left: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0;
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 0 0 3px var(--primary-light);
}

.timeline-date {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.timeline-content {
    background: var(--bg-white);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

/* 标签 */
.tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.tag-blue {
    background: #dbeafe;
    color: #1e40af;
}

.tag-green {
    background: #d1fae5;
    color: #065f46;
}

.tag-orange {
    background: #fed7aa;
    color: #9a3412;
}

/* 页脚 */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 4rem 2rem 2rem;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1rem;
}

.footer-logo {
    width: 50px;
    height: 50px;
    background: white;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--primary-color);
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
}

.footer-desc {
    color: #9ca3af;
    font-size: 14px;
    line-height: 1.8;
}

.footer-section h4 {
    font-size: 16px;
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #9ca3af;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 2rem;
    text-align: center;
    color: #6b7280;
    font-size: 14px;
}

/* 面包屑导航 */
.breadcrumb {
    padding: 1rem 2rem;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-light);
}

.breadcrumb a {
    color: var(--primary-color);
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* 内容页样式 */
.content-page {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.content-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--primary-color);
}

.content-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
}

.content-meta {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
    color: var(--text-light);
    font-size: 14px;
}

/* 可折叠内容 */
.collapsible {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
}

.collapsible-header {
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 600;
    color: var(--primary-color);
}

.collapsible-header:hover {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
}

.collapsible-content {
    padding: 1.5rem;
    display: none;
}

.collapsible.open .collapsible-content {
    display: block;
}

.collapsible-icon {
    transition: transform 0.3s;
}

.collapsible.open .collapsible-icon {
    transform: rotate(180deg);
}

/* 高亮框 */
.highlight-box {
    padding: 1.5rem;
    border-radius: 12px;
    margin: 1rem 0;
}

.highlight-box.blue {
    background: #eff6ff;
    border-left: 4px solid var(--primary-color);
}

.highlight-box.green {
    background: #f0fdf4;
    border-left: 4px solid var(--secondary-color);
}

.highlight-box.orange {
    background: #fff7ed;
    border-left: 4px solid var(--accent-color);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .navbar-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--primary-dark);
        flex-direction: column;
        padding: 1rem;
    }
    
    .navbar-menu.active {
        display: flex;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .stats {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}