/* 量化交易博客 - 专业金融科技风格 */
/* 配色方案：深蓝 + 金色 + 青色科技感 */

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

:root {
    --primary-color: #1e3a5f;
    --primary-light: #2d5a8a;
    --primary-dark: #0f1d30;
    --accent-gold: #d4af37;
    --accent-gold-light: #f0d060;
    --accent-cyan: #00d4ff;
    --accent-cyan-dark: #0099cc;
    --background-color: #0a0e17;
    --surface-color: #121825;
    --surface-hover: #1a2535;
    --text-primary: #e8edf5;
    --text-secondary: #a0aec0;
    --text-muted: #64748b;
    --border-color: #2d3a4f;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --gradient-gold: linear-gradient(135deg, #d4af37 0%, #f0d060 100%);
    --gradient-cyan: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
    --gradient-primary: linear-gradient(135deg, #1e3a5f 0%, #2d5a8a 100%);
    --gradient-hero: linear-gradient(135deg, #0f1d30 0%, #1e3a5f 50%, #0a0e17 100%);
    --shadow-card: 0 10px 40px rgba(0, 212, 255, 0.08);
    --shadow-hover: 0 20px 60px rgba(212, 175, 55, 0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 23, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 16px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    font-size: 1.6rem;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 8px 0;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-gold);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

/* 英雄区域 */
.hero {
    padding: 160px 0 100px;
    position: relative;
    overflow: hidden;
    background: var(--gradient-hero);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(212, 175, 55, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%2300d4ff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.hero-content {
    position: relative;
    text-align: center;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(212, 175, 55, 0.1);
    border: 1px solid var(--accent-gold);
    border-radius: 30px;
    font-size: 0.875rem;
    color: var(--accent-gold);
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ffffff 0%, #00d4ff 50%, #d4af37 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.hero .subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 50px;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* 分类区域 */
.categories-section {
    padding: 80px 0;
    background: var(--surface-color);
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.category-card {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.4s ease;
    text-decoration: none;
    display: block;
    position: relative;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-gold);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.category-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-gold);
    box-shadow: var(--shadow-hover);
}

.category-card:hover::before {
    transform: scaleX(1);
}

.category-icon {
    font-size: 2.5rem;
    padding: 24px 24px 0;
}

.category-content {
    padding: 20px 24px 24px;
}

.category-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.category-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.category-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.article-count {
    display: flex;
    align-items: center;
    gap: 6px;
}

.category-link {
    color: var(--accent-cyan);
    font-weight: 500;
    transition: color 0.3s ease;
}

.category-card:hover .category-link {
    color: var(--accent-gold);
}

/* 文章列表区域 */
.articles-section {
    padding: 80px 0;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.article-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
    text-decoration: none;
    display: block;
}

.article-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-card);
}

.article-header {
    padding: 24px 24px 0;
}

.article-category {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(0, 212, 255, 0.1);
    color: var(--accent-cyan);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.article-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 12px;
}

.article-excerpt {
    padding: 0 24px 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

.article-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.read-more {
    color: var(--accent-gold);
    font-weight: 500;
    transition: color 0.3s ease;
}

.article-card:hover .read-more {
    color: var(--accent-cyan);
}

/* 文章详情页 */
.article-page {
    padding-top: 100px;
}

.article-hero {
    padding: 80px 0 60px;
    background: var(--gradient-hero);
    position: relative;
}

.article-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 30% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(212, 175, 55, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    font-size: 0.9rem;
}

.breadcrumb a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.breadcrumb span {
    color: var(--text-muted);
}

.article-main-title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #ffffff 0%, #00d4ff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.article-meta-info {
    display: flex;
    gap: 24px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.article-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-body {
    padding: 60px 0;
    max-width: 800px;
    margin: 0 auto;
}

.article-content {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.9;
}

.article-content h2 {
    color: var(--text-primary);
    font-size: 1.6rem;
    font-weight: 700;
    margin: 40px 0 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
}

.article-content h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 600;
    margin: 32px 0 16px;
}

.article-content p {
    margin-bottom: 20px;
}

.article-content ul, .article-content ol {
    margin-bottom: 20px;
    padding-left: 24px;
}

.article-content li {
    margin-bottom: 10px;
}

.article-content strong {
    color: var(--accent-gold);
}

.article-content code {
    background: var(--surface-hover);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    color: var(--accent-cyan);
}

.article-content blockquote {
    border-left: 4px solid var(--accent-gold);
    padding: 16px 24px;
    margin: 24px 0;
    background: var(--surface-color);
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
}

/* 分类页 */
.category-page-hero {
    padding: 120px 0 60px;
    background: var(--gradient-hero);
    position: relative;
}

.category-page-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(212, 175, 55, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.category-page-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.category-page-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
}

/* 外链区域 */
.external-links {
    padding: 60px 0;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
}

.external-links-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    text-align: center;
}

.external-links-content {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 30px;
}

.external-links-content a {
    color: var(--text-muted);
    text-decoration: none;
    padding: 6px 14px;
    background: var(--background-color);
    border-radius: 6px;
    font-size: 0.85rem;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.external-links-content a:hover {
    color: var(--accent-gold);
    border-color: var(--accent-gold);
    background: rgba(212, 175, 55, 0.1);
}

.text-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.text-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    transition: color 0.3s ease;
}

.text-links a:hover {
    color: var(--accent-cyan);
}

/* 页脚 */
.footer {
    padding: 40px 0;
    background: var(--primary-dark);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }

    .hero .subtitle {
        font-size: 1rem;
    }

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

    .nav-links {
        display: none;
    }

    .categories-grid,
    .articles-grid {
        grid-template-columns: 1fr;
    }

    .article-main-title {
        font-size: 1.8rem;
    }
}

/* 动画 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 滚动条 */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

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

::selection {
    background: var(--accent-gold);
    color: var(--primary-dark);
}