/* OpenAI/GPT6 科技风格浅色配色 */
:root {
    --primary-bg: #ffffff;
    --secondary-bg: #f7f7f8;
    --tertiary-bg: #ececf1;
    --accent: #10a37f;
    --accent-hover: #0d8a68;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #999999;
    --border-color: #e5e5e5;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --gradient-start: #10a37f;
    --gradient-end: #1a1a1a;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
}

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

/* 头部导航 */
.header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    max-width: 1200px;
    margin: 0 auto;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo span {
    color: var(--accent);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--accent);
}

.nav-buttons {
    display: flex;
    gap: 12px;
}

.btn-primary {
    background-color: var(--accent);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    white-space: nowrap;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 163, 127, 0.3);
}

.btn-outline {
    background-color: transparent;
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
}

.mobile-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: white;
    border-bottom: 1px solid var(--border-color);
    padding: 20px;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav a {
    display: block;
    padding: 14px 0;
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 1px solid var(--border-color);
}

.mobile-nav a:last-child {
    border-bottom: none;
}

@media (max-width: 900px) {
    .nav-menu {
        display: none;
    }

    .nav-buttons .btn-primary span {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }
}

@media (max-width: 480px) {
    .nav-buttons .btn-primary span {
        display: inline;
    }
}

/* 英雄区 */
.hero {
    background: linear-gradient(180deg, #ffffff 0%, #f7f7f8 100%);
    padding: 80px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(16, 163, 127, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--accent), #059669);
    color: white;
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 64px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

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

.hero-stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--accent);
}

.hero-stat-label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}

.hero-images {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 50px;
    flex-wrap: wrap;
}

.hero-images img {
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
    transition: transform 0.3s, box-shadow 0.3s;
}

.hero-images img:hover {
    transform: translateY(-8px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.18);
}

@media (max-width: 768px) {
    .hero {
        padding: 60px 0 80px;
    }

    .hero h1 {
        font-size: 42px;
    }

    .hero p {
        font-size: 18px;
    }

    .hero-stats {
        gap: 40px;
    }

    .hero-stat-number {
        font-size: 28px;
    }
}

/* 页面内容 */
.page-content {
    padding: 80px 0;
}

.page-header {
    text-align: center;
    margin-bottom: 60px;
}

.page-header h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.page-header p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 内容区块 */
.section {
    padding: 80px 0;
}

.section-alt {
    background-color: var(--secondary-bg);
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 50px;
}

/* 特性卡片 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.feature-card {
    background: white;
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
    border-color: var(--accent);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--accent), #059669);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 文章卡片 */
.article-card {
    background: white;
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.article-card h2 {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.article-card .meta {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.article-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* 新闻列表 */
.news-list {
    display: grid;
    gap: 24px;
}

.news-item {
    display: flex;
    gap: 24px;
    padding: 28px;
    background: white;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.news-item:hover {
    border-color: var(--accent);
    box-shadow: var(--card-shadow);
}

.news-date {
    flex-shrink: 0;
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, var(--accent), #059669);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
}

.news-date .day {
    font-size: 24px;
    font-weight: 700;
    line-height: 1;
}

.news-date .month {
    font-size: 12px;
    text-transform: uppercase;
    margin-top: 4px;
}

.news-content h3 {
    font-size: 20px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.news-content p {
    color: var(--text-secondary);
    font-size: 15px;
}

/* 统计数据 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 40px 24px;
    background: white;
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    color: var(--text-secondary);
    margin-top: 8px;
    font-size: 15px;
}

/* 时间线 */
.timeline {
    position: relative;
    padding-left: 40px;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent), var(--border-color));
}

.timeline-item {
    position: relative;
    padding-bottom: 40px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -33px;
    top: 0;
    width: 16px;
    height: 16px;
    background-color: var(--accent);
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 0 0 2px var(--accent);
}

.timeline-date {
    font-size: 14px;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 8px;
}

.timeline-content h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

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

/* 文本内容区块 */
.text-content {
    background: white;
    border-radius: 16px;
    padding: 48px;
    margin: 0;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
}

.text-content h2 {
    font-size: 28px;
    margin: 40px 0 20px;
    color: var(--text-primary);
}

.text-content h2:first-child {
    margin-top: 0;
}

.text-content h3 {
    font-size: 22px;
    margin: 30px 0 16px;
    color: var(--text-primary);
}

.text-content p {
    margin-bottom: 20px;
    line-height: 1.9;
    color: var(--text-secondary);
}

.text-content ul {
    margin: 20px 0;
    padding-left: 24px;
}

.text-content li {
    margin-bottom: 12px;
    color: var(--text-secondary);
}

blockquote {
    border-left: 4px solid var(--accent);
    padding: 20px 24px;
    background-color: var(--secondary-bg);
    border-radius: 0 12px 12px 0;
    margin: 24px 0;
    font-style: italic;
    color: var(--text-secondary);
}

/* 标签 */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}

.tag {
    padding: 6px 14px;
    background-color: var(--secondary-bg);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
}

/* 页面底部 */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: 60px 0 30px;
    margin-top: 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 16px;
    margin-bottom: 16px;
    color: white;
}

.footer-section a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-bottom: 10px;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--accent);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

/* 面包屑导航 */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 30px;
    font-size: 14px;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
}

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

/* 表格 */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

table th,
table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

table th {
    background-color: var(--secondary-bg);
    font-weight: 600;
    color: var(--text-primary);
}

table td {
    color: var(--text-secondary);
}

/* CTA区块 */
.cta-section {
    background: linear-gradient(135deg, var(--accent), #059669);
    border-radius: 24px;
    padding: 60px;
    text-align: center;
    color: white;
}

.cta-section h2 {
    font-size: 36px;
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 32px;
}

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

.cta-section .btn-primary:hover {
    background: var(--secondary-bg);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 36px;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 30px;
    }

    .page-header h1 {
        font-size: 32px;
    }

    .section-title {
        font-size: 28px;
    }

    .text-content {
        padding: 32px 24px;
    }

    .cta-section {
        padding: 40px 24px;
    }

    .cta-section h2 {
        font-size: 28px;
    }

    .news-item {
        flex-direction: column;
        gap: 16px;
    }
}