/* ===================================
   MindLynx开源模型探索站 - 精致样式表
   简洁大方 · 优雅精致
   =================================== */

/* ==================== CSS 变量定义 ==================== */
:root {
    /* 精致配色方案 */
    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --primary-light: #3B82F6;
    --accent: #10B981;
    --accent-secondary: #06B6D4;
    
    /* 背景层次 */
    --bg-primary: #FAFBFC;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F1F5F9;
    --bg-dark: #0F172A;
    
    /* 文字层次 */
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    --text-inverse: #FFFFFF;
    
    /* 边框与阴影 */
    --border-light: #E2E8F0;
    --border-subtle: rgba(0, 0, 0, 0.06);
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.06), 0 4px 16px -4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 8px 30px -8px rgba(0, 0, 0, 0.1), 0 12px 40px -12px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 40px -10px rgba(37, 99, 235, 0.2);
    
    /* 间距系统 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 字体 */
    --font-cn: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
    --font-display: 'Plus Jakarta Sans', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* 过渡 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 容器 */
    --container-max: 1140px;
    --header-height: 72px;
}

/* ==================== 基础重置 ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-cn);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.65;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==================== 容器 ==================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ==================== 顶部导航 ==================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
}

.header-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-mark {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    font-family: var(--font-display);
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.logo-sub {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    font-weight: 400;
    padding-left: var(--space-sm);
    border-left: 1px solid var(--border-light);
    margin-left: var(--space-sm);
}

.main-navigation {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.nav-item {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
    transform: translateX(-50%);
}

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

.nav-item.active {
    color: var(--primary);
}

.nav-item.active::after {
    width: calc(100% - 24px);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.icon-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.icon-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

/* ==================== 主内容区 ==================== */
.main-content {
    padding-top: var(--header-height);
    min-height: 100vh;
}

/* ==================== Hero 区域 ==================== */
.hero-section {
    position: relative;
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4xl) var(--space-lg);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
    top: -200px;
    right: -100px;
    animation: float 20s ease-in-out infinite;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.12) 0%, transparent 70%);
    bottom: -150px;
    left: -100px;
    animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, 30px); }
}

.grid-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.15);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary);
    margin-bottom: var(--space-lg);
    animation: fadeInUp 0.6s ease-out;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-top: var(--space-xs);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-light);
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 14px 28px;
    background: var(--primary);
    color: var(--text-inverse);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    box-shadow: 0 4px 14px -4px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px -8px rgba(37, 99, 235, 0.5);
}

.btn-primary svg {
    transition: transform var(--transition-fast);
}

.btn-primary:hover svg {
    transform: translateX(4px);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    padding: 14px 28px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== 通用区块样式 ==================== */
.content-section {
    padding: var(--space-4xl) 0;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.section-description {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ==================== 筛选功能 ==================== */
.filter-group {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-2xl);
}

.filter-chip {
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.filter-chip:hover {
    color: var(--text-primary);
    background: var(--border-light);
}

.filter-chip.active {
    color: var(--text-inverse);
    background: var(--primary);
}

/* ==================== 文章列表 ==================== */
.articles-feed {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.article-card {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    overflow: hidden;
    cursor: pointer;
}

.article-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.03) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.article-card:hover {
    border-color: rgba(37, 99, 235, 0.3);
    box-shadow: var(--shadow-md);
    transform: translateY(-6px);
}

.article-card:hover::before {
    opacity: 1;
}

.article-card.hidden {
    display: none;
}

.article-card.page-hidden {
    display: none;
}

.card-content {
    position: relative;
    z-index: 1;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.card-category {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    background: rgba(37, 99, 235, 0.08);
    padding: 4px 10px;
    border-radius: var(--radius-full);
}

.card-date {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    line-height: 1.4;
    transition: color var(--transition-fast);
}

.article-card:hover .card-title {
    color: var(--primary);
}

.card-excerpt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-readtime {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.card-arrow {
    font-size: 1.25rem;
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
}

.article-card:hover .card-arrow {
    color: var(--primary);
    transform: translateX(4px);
}

.section-cta {
    text-align: center;
    margin-top: var(--space-2xl);
}

.link-button {
    display: inline-flex;
    align-items: center;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--primary);
    transition: all var(--transition-fast);
}

.link-button:hover {
    color: var(--primary-hover);
}

/* ==================== 特色功能区 ==================== */
.features-section {
    padding: var(--space-4xl) 0;
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
}

.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: rgba(37, 99, 235, 0.2);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
    border-radius: var(--radius-lg);
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.feature-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.feature-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==================== 关于区域 ==================== */
.about-section {
    padding: var(--space-4xl) 0;
    background: var(--bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    max-width: 800px;
    margin: 0 auto;
}

.about-content {
    text-align: center;
}

.about-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.about-features {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.about-feature {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.about-feature .feature-icon {
    font-size: 1.1rem;
}

/* ==================== 实验室页面 ==================== */
.page-hero {
    position: relative;
    padding: calc(var(--header-height) + var(--space-3xl)) var(--space-lg) var(--space-2xl);
    text-align: center;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-light);
    overflow: hidden;
}

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

.page-hero-categories {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

.page-hero-about {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(37, 99, 235, 0.05) 100%);
}

.page-hero-articles {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(16, 185, 129, 0.05) 100%);
}

.page-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.page-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

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

.lab-section {
    padding: var(--space-2xl) 0 var(--space-4xl);
    background: var(--bg-primary);
}

/* 对话演示面板 */
.demo-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    margin-bottom: var(--space-3xl);
    box-shadow: var(--shadow-sm);
}

.demo-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-light);
}

.demo-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
}

.demo-subtitle {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-top: 2px;
}

.model-selector {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.model-selector label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.model-selector select {
    padding: 8px 14px;
    font-size: 0.9rem;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.model-selector select:focus {
    outline: none;
    border-color: var(--primary);
}

.chat-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
}

.chat-messages {
    min-height: 320px;
    max-height: 400px;
    overflow-y: auto;
    padding: var(--space-lg);
}

.message {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message-assistant .message-avatar {
    background: var(--primary);
    color: white;
}

.message-user .message-avatar {
    background: var(--accent);
    color: white;
}

.message-content {
    flex: 1;
}

.message-content p {
    background: var(--bg-tertiary);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.message-user .message-content p {
    background: var(--primary);
    color: white;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: var(--space-xs);
    display: block;
}

.chat-input-container {
    padding: var(--space-lg);
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-light);
}

.param-controls {
    display: flex;
    gap: var(--space-xl);
    margin-bottom: var(--space-md);
}

.param-group {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.param-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.param-group input[type="range"] {
    width: 100px;
    height: 4px;
    background: var(--border-light);
    border-radius: 2px;
    -webkit-appearance: none;
    cursor: pointer;
}

.param-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
}

.param-value {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 32px;
}

.input-row {
    display: flex;
    gap: var(--space-sm);
}

.input-row textarea {
    flex: 1;
    padding: var(--space-md);
    font-size: 0.9rem;
    font-family: var(--font-cn);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    color: var(--text-primary);
    resize: none;
    transition: border-color var(--transition-fast);
}

.input-row textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.btn-send {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.btn-send:hover {
    background: var(--primary-hover);
}

.demo-tip {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: var(--space-sm);
    text-align: center;
}

/* 实验项目展示 */
.projects-section {
    margin-bottom: var(--space-3xl);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.project-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.project-card:hover {
    border-color: rgba(37, 99, 235, 0.2);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.project-visual {
    height: 160px;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--border-light) 100%);
    position: relative;
    overflow: hidden;
}

.project-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(37, 99, 235, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
}

.project-overlay {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
}

.project-status {
    display: inline-block;
    padding: 4px 10px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent);
    background: rgba(16, 185, 129, 0.1);
    border-radius: var(--radius-full);
}

.project-content {
    padding: var(--space-lg);
}

.project-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.project-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tag {
    padding: 4px 10px;
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

.project-link {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary);
    transition: color var(--transition-fast);
}

.project-link:hover {
    color: var(--primary-hover);
}

/* 技术栈展示 */
.tech-stack-section {
    padding-top: var(--space-2xl);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.tech-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
    transition: all var(--transition-fast);
}

.tech-card:hover {
    border-color: rgba(37, 99, 235, 0.2);
    transform: translateY(-2px);
}

.tech-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: rgba(37, 99, 235, 0.08);
    border-radius: var(--radius-md);
    color: var(--primary);
    margin-bottom: var(--space-sm);
}

.tech-card h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.tech-card p {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

/* ==================== 页脚 ==================== */
.site-footer {
    background: var(--bg-dark);
    color: var(--text-inverse);
    padding: var(--space-3xl) 0 var(--space-lg);
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--space-lg);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-brand .logo-mark,
.footer-brand .logo-text {
    color: var(--text-inverse);
}

.footer-slogan {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    margin-top: var(--space-sm);
}

.footer-links {
    display: flex;
    gap: var(--space-3xl);
}

.link-group h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-md);
}

.link-group a {
    display: block;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    padding: var(--space-xs) 0;
    transition: color var(--transition-fast);
}

.link-group a:hover {
    color: var(--text-inverse);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-copyright {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-filing {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.8rem;
}

.footer-filing a {
    color: rgba(255, 255, 255, 0.4);
    transition: color var(--transition-fast);
}

.footer-filing a:hover {
    color: var(--text-inverse);
}

.footer-filing .divider {
    color: rgba(255, 255, 255, 0.2);
}

.filing-icon {
    width: 14px;
    height: 14px;
    margin-right: 4px;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 968px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-top {
        flex-direction: column;
        gap: var(--space-xl);
    }
    
    .footer-links {
        gap: var(--space-xl);
    }
}

/* ==================== 汉堡菜单 ==================== */
.hamburger-menu {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger-menu:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.hamburger-menu svg {
    transition: transform var(--transition-fast);
}

/* 移动端导航菜单 */
.mobile-nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.mobile-nav-overlay.active {
    display: block;
    opacity: 1;
}

.mobile-nav-menu {
    position: fixed;
    top: 0;
    right: -280px;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    z-index: 1000;
    padding: var(--space-lg);
    transition: right var(--transition-base);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
}

.mobile-nav-menu.active {
    right: 0;
}

.mobile-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-light);
}

.mobile-nav-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-nav-close:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.mobile-nav-items {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.mobile-nav-item {
    display: flex;
    align-items: center;
    padding: var(--space-md);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.mobile-nav-item:hover,
.mobile-nav-item.active {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.08);
}

.mobile-nav-item.active {
    font-weight: 600;
}

/* ==================== 搜索框 ==================== */
.search-box {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    max-width: 500px;
    margin: var(--space-xl) auto 0;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-box svg {
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.search-box input {
    flex: 1;
    border: none;
    background: none;
    font-size: 1rem;
    color: var(--text-primary);
    outline: none;
}

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

/* ==================== 知识库页面 ==================== */
.articles-page-section {
    padding: var(--space-2xl) 0 var(--space-4xl);
    background: var(--bg-primary);
}

.articles-stats {
    text-align: center;
    margin-bottom: var(--space-xl);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.articles-stats strong {
    color: var(--primary);
    font-weight: 600;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    margin-top: var(--space-2xl);
}

.pagination-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pagination-btn:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ==================== 分类页面 ==================== */
.categories-section {
    padding: var(--space-2xl) 0 var(--space-4xl);
    background: var(--bg-primary);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-3xl);
}

.category-card {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-xl);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.category-card:hover {
    border-color: rgba(37, 99, 235, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.category-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
    border-radius: var(--radius-lg);
    color: var(--primary);
    flex-shrink: 0;
}

.category-card-2 .category-icon {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    color: var(--accent);
}

.category-card-3 .category-icon {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.1) 0%, rgba(37, 99, 235, 0.1) 100%);
    color: var(--accent-secondary);
}

.category-card-4 .category-icon {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(239, 68, 68, 0.1) 100%);
    color: #F59E0B;
}

.category-content {
    flex: 1;
}

.category-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.category-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.category-stats {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.category-count {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.category-arrow {
    font-size: 1.25rem;
    color: var(--primary);
    transition: transform var(--transition-fast);
}

.category-card:hover .category-arrow {
    transform: translateX(4px);
}

.category-bg {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

/* 热门标签 */
.hot-tags-section {
    margin-bottom: var(--space-3xl);
}

.hot-tags-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
}

.hot-tag {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.hot-tag:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.tag-count {
    padding: 2px 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

/* 时间归档 */
.archive-section {
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--border-light);
}

.archive-timeline {
    max-width: 600px;
    margin: 0 auto;
}

.archive-year {
    margin-bottom: var(--space-lg);
}

.year-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    padding-left: var(--space-md);
    border-left: 3px solid var(--primary);
}

.archive-months {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    padding-left: var(--space-lg);
}

.archive-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.archive-item:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.archive-item .month {
    font-weight: 500;
}

.archive-item .count {
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

/* ==================== 关于页面 ==================== */
.about-page-section {
    padding: var(--space-2xl) 0 var(--space-4xl);
    background: var(--bg-primary);
}

.about-intro {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xl);
    max-width: 800px;
    margin: 0 auto var(--space-2xl);
    padding: var(--space-xl);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
}

.about-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-secondary) 100%);
    border-radius: 50%;
    flex-shrink: 0;
}

.about-avatar .logo-mark {
    font-size: 2.5rem;
    color: white;
}

.about-info {
    flex: 1;
}

.about-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.about-tagline {
    font-size: 1rem;
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.about-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.about-description:last-child {
    margin-bottom: 0;
}

/* 关于页面统计卡片 */
.about-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    max-width: 800px;
    margin: 0 auto var(--space-2xl);
}

.about-stat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

/* 联系部分 */
.contact-section {
    margin-bottom: var(--space-2xl);
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.contact-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-md);
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.contact-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.contact-value {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

/* 支持部分 */
.support-section {
    max-width: 600px;
    margin: 0 auto;
}

.support-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-2xl);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(16, 185, 129, 0.05) 100%);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    text-align: center;
}

.support-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--primary);
    border-radius: 50%;
    color: white;
    margin-bottom: var(--space-md);
}

.support-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.support-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
    max-width: 450px;
}

@media (max-width: 768px) {
    .hamburger-menu {
        display: flex;
    }
    
    .main-navigation {
        display: none;
    }
}
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        gap: var(--space-lg);
    }
    
    .stat-value {
        font-size: 1.75rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-group {
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: var(--space-sm);
    }
    
    .filter-chip {
        flex-shrink: 0;
    }
    
    .demo-header {
        flex-direction: column;
        gap: var(--space-md);
        align-items: flex-start;
    }
    
    .param-controls {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    /* 知识库页面响应式 */
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    /* 分类页面响应式 */
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .category-card {
        flex-direction: column;
        text-align: center;
    }
    
    .category-stats {
        justify-content: center;
    }
    
    /* 关于页面响应式 */
    .about-intro {
        flex-direction: column;
        text-align: center;
    }
    
    .about-avatar {
        margin: 0 auto;
    }
    
    .about-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==================== 滚动条样式 ==================== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* ==================== 选中样式 ==================== */
::selection {
    background: var(--primary);
    color: white;
}

/* ==================== 返回顶部按钮 ==================== */
.scroll-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px -4px rgba(37, 99, 235, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 100;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    background: var(--primary-hover);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px -8px rgba(37, 99, 235, 0.5);
}

.scroll-to-top:active {
    transform: translateY(0);
}

/* ==================== 焦点样式（可访问性） ==================== */
.nav-item:focus,
.filter-chip:focus,
.btn-primary:focus,
.btn-secondary:focus,
.link-button:focus,
.project-link:focus,
.mobile-nav-item:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.nav-item:focus:not(:focus-visible),
.filter-chip:focus:not(:focus-visible),
.btn-primary:focus:not(:focus-visible),
.btn-secondary:focus:not(:focus-visible),
.link-button:focus:not(:focus-visible),
.project-link:focus:not(:focus-visible),
.mobile-nav-item:focus:not(:focus-visible) {
    outline: none;
}

/* ==================== 滚动动画 ==================== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* 延迟动画类 */
.animate-delay-1 { transition-delay: 0.1s; }
.animate-delay-2 { transition-delay: 0.2s; }
.animate-delay-3 { transition-delay: 0.3s; }
.animate-delay-4 { transition-delay: 0.4s; }