/**
 * TechBlog - 科技感博客主题样式
 * 自适应PC和移动端
 */

/* ===== CSS 变量 ===== */
:root {
    /* 主题色 */
    --primary-color: #00d4ff;
    --primary-dark: #0099cc;
    --primary-light: #66e5ff;
    --secondary-color: #ff6b35;
    --accent-color: #7c3aed;
    
    /* 背景色 */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: rgba(18, 18, 26, 0.8);
    --bg-hover: rgba(0, 212, 255, 0.1);
    
    /* 文字色 */
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    
    /* 边框 */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-glow: rgba(0, 212, 255, 0.5);
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
    --gradient-card: linear-gradient(135deg, rgba(0, 212, 255, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);
    
    /* 字体 */
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 浅色主题 */
.light-theme {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0f0f5;
    --bg-card: rgba(255, 255, 255, 0.9);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5a;
    --text-muted: #8a8a9a;
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
}

/* ===== 全局样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 选择文本样式 */
::selection {
    background: var(--primary-color);
    color: var(--bg-primary);
}

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

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

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

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

/* ===== 背景动画 ===== */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.grid-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.3;
    animation: gridMove 20s linear infinite;
}

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

.floating-particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 50%;
    opacity: 0.6;
    animation: float 15s infinite ease-in-out;
    box-shadow: 0 0 10px var(--primary-color);
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.6; }
    25% { transform: translate(100px, -100px) scale(1.2); opacity: 0.8; }
    50% { transform: translate(200px, 50px) scale(0.8); opacity: 0.4; }
    75% { transform: translate(100px, 100px) scale(1.1); opacity: 0.7; }
}

/* ===== 容器 ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
}

.light-theme .navbar {
    background: rgba(255, 255, 255, 0.9);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    font-size: 1.2rem;
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--bg-hover);
}

.nav-link.active {
    color: var(--primary-color);
    background: var(--bg-hover);
}

.nav-icon {
    font-size: 1rem;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.search-toggle,
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.search-toggle:hover,
.theme-toggle:hover {
    background: var(--bg-hover);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== 搜索弹窗 ===== */
.search-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    animation: fadeIn var(--transition-fast);
}

.search-modal.active {
    display: flex;
}

.search-modal-content {
    position: relative;
    width: 90%;
    max-width: 600px;
    padding: var(--spacing-xl);
}

.search-form {
    display: flex;
    gap: var(--spacing-md);
}

.search-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.2rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    outline: none;
    transition: all var(--transition-normal);
}

.search-input:focus {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-glow);
}

.search-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    color: var(--bg-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.search-close {
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    transition: color var(--transition-normal);
}

.search-close:hover {
    color: var(--primary-color);
}

/* ===== 主内容 ===== */
.main-content {
    padding-top: 80px;
    min-height: calc(100vh - 200px);
}

/* ===== 英雄区域 ===== */
.hero {
    padding: var(--spacing-2xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

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

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleGlow 3s ease-in-out infinite;
}

@keyframes titleGlow {
    0%, 100% { filter: brightness(1); }
    50% { filter: brightness(1.2); }
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: var(--font-mono);
}

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

/* ===== 文章列表 ===== */
.posts-section {
    padding: var(--spacing-2xl) 0;
}

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

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-title::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

/* ===== 文章卡片 ===== */
.post-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
}

.post-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--primary-color);
}

.post-cover {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--bg-tertiary);
}

.post-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.post-card:hover .post-cover img {
    transform: scale(1.05);
}

.post-cover-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    background: var(--gradient-card);
    font-size: 3rem;
}

.post-category {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(0, 212, 255, 0.9);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--bg-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.post-content {
    padding: var(--spacing-lg);
}

.post-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.post-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-normal);
}

.post-title a:hover {
    color: var(--primary-color);
}

.post-excerpt {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

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

.post-meta-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.post-date,
.post-views {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    padding: 2px var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--primary-color);
    color: var(--bg-primary);
}

/* ===== 文章详情 ===== */
.post-single {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

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

.post-header .post-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.post-header .post-meta {
    justify-content: center;
    border: none;
    padding: 0;
}

.post-cover-full {
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.post-cover-full img {
    width: 100%;
    height: auto;
}

/* ===== 文章内容 ===== */
.post-body {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.post-body h1,
.post-body h2,
.post-body h3,
.post-body h4,
.post-body h5,
.post-body h6 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    line-height: 1.3;
}

.post-body h1 { font-size: 2rem; }
.post-body h2 { 
    font-size: 1.75rem;
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}
.post-body h3 { font-size: 1.5rem; }
.post-body h4 { font-size: 1.25rem; }
.post-body h5 { font-size: 1.1rem; }
.post-body h6 { font-size: 1rem; }

.post-body .anchor {
    color: var(--primary-color);
    text-decoration: none;
    margin-right: var(--spacing-sm);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.post-body h1:hover .anchor,
.post-body h2:hover .anchor,
.post-body h3:hover .anchor,
.post-body h4:hover .anchor,
.post-body h5:hover .anchor,
.post-body h6:hover .anchor {
    opacity: 1;
}

.post-body p {
    margin-bottom: var(--spacing-lg);
}

.post-body a {
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast);
}

.post-body a:hover {
    border-bottom-color: var(--primary-color);
}

.post-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
}

.post-body ul,
.post-body ol {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.post-body li {
    margin-bottom: var(--spacing-sm);
}

.post-body blockquote {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-tertiary);
    border-left: 4px solid var(--primary-color);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-secondary);
}

.post-body blockquote p:last-child {
    margin-bottom: 0;
}

.post-body hr {
    margin: var(--spacing-2xl) 0;
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.post-body table {
    width: 100%;
    margin: var(--spacing-lg) 0;
    border-collapse: collapse;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.post-body th,
.post-body td {
    padding: var(--spacing-md);
    text-align: left;
    border: 1px solid var(--border-color);
}

.post-body th {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.post-body tr:hover {
    background: var(--bg-hover);
}

/* ===== 代码块 ===== */
.post-body pre {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow-x: auto;
    position: relative;
}

.post-body pre::before {
    content: attr(data-language);
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-md);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.post-body code {
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.post-body pre code {
    background: transparent;
    padding: 0;
}

.post-body :not(pre) > code {
    background: var(--bg-tertiary);
    padding: 2px var(--spacing-sm);
    border-radius: var(--radius-sm);
    color: var(--primary-color);
}

/* ===== 目录 ===== */
.toc {
    position: sticky;
    top: 100px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
}

.toc-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.toc-list {
    list-style: none;
}

.toc-item {
    margin-bottom: var(--spacing-sm);
}

.toc-link {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: all var(--transition-fast);
}

.toc-link:hover {
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    background: var(--bg-hover);
}

.toc-link.active {
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

/* ===== 分页 ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-normal);
}

.page-link:hover {
    background: var(--bg-hover);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.page-link.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: var(--bg-primary);
}

/* ===== 页脚 ===== */
.footer {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.footer-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

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

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.powered {
    margin-top: var(--spacing-sm);
    font-size: 0.85rem;
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: var(--bg-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

/* ===== 按钮通用 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero-stats {
        gap: var(--spacing-xl);
    }
    
    .toc {
        display: none;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        flex-wrap: wrap;
    }
    
    .nav-toggle {
        display: flex;
        order: 3;
    }
    
    .nav-menu {
        display: none;
        order: 4;
        width: 100%;
        flex-direction: column;
        padding-top: var(--spacing-md);
        gap: 0;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-link {
        width: 100%;
        padding: var(--spacing-md);
        border-radius: 0;
    }
    
    .nav-actions {
        gap: var(--spacing-xs);
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: var(--spacing-lg);
    }
    
    .stat-item {
        min-width: 100px;
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
    
    .post-body {
        font-size: 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .post-single {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .post-header .post-title {
        font-size: 1.5rem;
    }
    
    .search-modal-content {
        padding: var(--spacing-lg);
    }
    
    .search-input {
        font-size: 1rem;
    }
}

/* ===== 动画 ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* 加载动画 */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Toast 提示 */
.toast {
    position: fixed;
    top: 100px;
    right: 20px;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 3000;
    animation: slideUp var(--transition-normal);
}

.toast.success {
    border-color: #10b981;
}

.toast.error {
    border-color: #ef4444;
}

.toast.warning {
    border-color: #f59e0b;
}