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

:root {
    --primary-color: #00d4ff;
    --secondary-color: #00ff88;
    --accent-color: #7b68ee;
    --dark-bg: #0a0a1a;
    --card-bg: #12122a;
    --border-color: rgba(0, 212, 255, 0.2);
    --text-primary: #e0e0e0;
    --text-secondary: #888888;
    --gradient-start: #0a0a1a;
    --gradient-end: #1a1a3a;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    min-height: 100vh;
}

body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(0, 255, 136, 0.06) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.page-container {
    position: relative;
    z-index: 1;
}

.header {
    background: rgba(10, 10, 26, 0.9);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 30px;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

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

.header-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-logo h1 {
    font-size: 20px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-logo .logo-icon {
    font-size: 24px;
}

.header-nav {
    display: flex;
    gap: 24px;
}

.header-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.header-nav a:hover {
    color: var(--primary-color);
}

.header-nav a.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px;
}

.section-title {
    font-size: 24px;
    color: var(--text-primary);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

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

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 212, 255, 0.15);
    border-color: rgba(0, 212, 255, 0.4);
}

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

.card-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.card-count {
    display: inline-block;
    background: rgba(0, 212, 255, 0.1);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    margin-top: 12px;
}

.sidebar-layout {
    display: flex;
    gap: 30px;
}

.sidebar {
    width: 280px;
    flex-shrink: 0;
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 140px);
    overflow: hidden;
}

.sidebar-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.sidebar-card h3 {
    font-size: 16px;
    color: var(--primary-color);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.sidebar-nav {
    list-style: none;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 4px;
}

.sidebar-nav::-webkit-scrollbar {
    width: 6px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: rgba(0, 212, 255, 0.05);
    border-radius: 3px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(0, 212, 255, 0.3);
    border-radius: 3px;
}

.sidebar-nav::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 212, 255, 0.5);
}

.sidebar-nav li {
    margin-bottom: 8px;
}

.sidebar-nav a {
    display: block;
    padding: 10px 12px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    border-radius: 6px;
    transition: all 0.3s;
}

.sidebar-nav a:hover {
    background: rgba(0, 212, 255, 0.1);
    color: var(--primary-color);
}

.sidebar-nav a.active {
    background: rgba(0, 212, 255, 0.15);
    color: var(--primary-color);
    border-left: 3px solid var(--primary-color);
}

.content-area {
    flex: 1;
}

.content-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 24px;
}

.content-card.has-image {
    background: #ffffff;
}

.content-card.has-image h1 {
    color: #1a1a2e;
    border-bottom-color: rgba(0, 212, 255, 0.3);
}

.content-card.has-image h2 {
    color: #00d4ff;
}

.content-card.has-image h3 {
    color: #1a1a2e;
}

.content-card.has-image p {
    color: #333333;
}

.content-card.has-image li {
    color: #333333;
}

.content-card.has-image strong {
    color: #1a1a2e;
}

.content-card.has-image code {
    background: rgba(0, 212, 255, 0.1);
    color: #00d4ff;
}

.content-card.has-image pre {
    background: #0d0d1a;
}

.content-card.has-image pre code {
    color: #e0e0e0;
}

.content-card.has-image table th {
    background: rgba(0, 212, 255, 0.1);
    color: #00d4ff;
}

.content-card.has-image table td {
    color: #333333;
}

.content-card.has-image table {
    border-color: rgba(0, 212, 255, 0.2);
}

.content-card h1 {
    font-size: 26px;
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.content-card h2 {
    font-size: 20px;
    color: var(--text-primary);
    margin: 20px 0 12px;
    color: var(--primary-color);
}

.content-card h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin: 16px 0 8px;
}

.content-card p {
    font-size: 15px;
    color: var(--text-secondary);
    margin: 8px 0;
    line-height: 1.8;
}

.content-card ul, .content-card ol {
    margin: 8px 0;
    padding-left: 24px;
}

.content-card li {
    font-size: 15px;
    color: var(--text-secondary);
    margin: 4px 0;
    line-height: 1.7;
}

.content-card img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 16px auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.content-card pre {
    background: #0d0d1a;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin: 16px 0;
    font-size: 13px;
    line-height: 1.6;
}

.content-card code {
    background: rgba(0, 212, 255, 0.1);
    color: var(--primary-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 14px;
    font-family: 'Consolas', 'Monaco', monospace;
}

.content-card pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

.content-card table {
    border-collapse: collapse;
    width: 100%;
    margin: 16px 0;
    border-radius: 8px;
    overflow: hidden;
}

.content-card th, .content-card td {
    border: 1px solid var(--border-color);
    padding: 12px;
    text-align: left;
    font-size: 14px;
}

.content-card th {
    background: rgba(0, 212, 255, 0.1);
    color: var(--primary-color);
    font-weight: 600;
}

.content-card td {
    color: var(--text-secondary);
}

.content-card blockquote {
    border-left: 4px solid var(--primary-color);
    background: rgba(0, 212, 255, 0.05);
    padding: 12px 16px;
    margin: 12px 0;
    border-radius: 0 8px 8px 0;
}

.content-card blockquote p {
    margin: 4px 0;
}

.content-card strong {
    color: var(--text-primary);
}

.back-to-top {
    position: fixed;
    right: 30px;
    bottom: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #fff;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    text-decoration: none;
    font-size: 20px;
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
    transition: all 0.3s;
    z-index: 200;
}

.back-to-top:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.4);
}

.footer {
    background: rgba(10, 10, 26, 0.95);
    border-top: 1px solid var(--border-color);
    padding: 24px 30px;
    margin-top: 40px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
}

.home-hero {
    text-align: center;
    padding: 60px 30px;
    margin-bottom: 40px;
}

.home-hero h1 {
    font-size: 42px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

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

.search-box {
    margin-bottom: 16px;
}

.search-box input {
    width: 100%;
    padding: 10px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-primary);
    outline: none;
    transition: all 0.3s;
}

.search-box input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.search-box input::placeholder {
    color: var(--text-secondary);
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.tag {
    background: rgba(0, 212, 255, 0.1);
    color: var(--primary-color);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.tag:hover {
    background: rgba(0, 212, 255, 0.2);
}

@media (max-width: 768px) {
    .header {
        padding: 12px 16px;
    }

    .header-content {
        flex-direction: column;
        gap: 12px;
    }

    .header-nav {
        gap: 16px;
    }

    .main-content {
        padding: 16px;
    }

    .sidebar-layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: static;
    }

    .home-hero h1 {
        font-size: 28px;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .content-card {
        padding: 20px;
    }
}