/**
 * LastroN的下班生活 - 样式表
 * 设计理念：纯粹、成熟、不规则层次、黑白高级感
 */

/* ========================================
   基础变量
   ======================================== */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #141414;
    --bg-hover: #1a1a1a;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-gray: #666666;
    --text-muted: #444444;
    
    --accent: #ffffff;
    --accent-hover: #e0e0e0;
    
    --border: #222222;
    --border-light: #333333;
    
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.8);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.9);
    
    --font-mono: 'SF Mono', 'Consolas', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ========================================
   重置 & 基础
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--text-primary);
    text-decoration: none;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.7;
}

/* ========================================
   登录页 - 全屏背景
   ======================================== */
.login-page {
    min-height: 100vh;
    display: flex;
    position: relative;
    overflow: hidden;
}

.login-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    transition: opacity 1s ease;
}

.login-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(0, 0, 0, 0.85) 0%,
        rgba(0, 0, 0, 0.6) 50%,
        rgba(0, 0, 0, 0.85) 100%
    );
}

.login-content {
    position: relative;
    z-index: 10;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

.login-brand {
    text-align: center;
    margin-bottom: 60px;
}

.login-brand h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    margin-bottom: 12px;
}

.login-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
}

.login-box {
    width: 100%;
    max-width: 380px;
    background: var(--bg-glass, rgba(10, 10, 10, 0.9));
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    padding: 48px;
    position: relative;
}

.login-box::before {
    content: '';
    position: absolute;
    top: -1px;
    right: 40px;
    width: 80px;
    height: 1px;
    background: var(--text-primary);
}

.login-box::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 40px;
    width: 80px;
    height: 1px;
    background: var(--text-primary);
}

.login-form .form-group {
    margin-bottom: 28px;
}

.login-form label {
    display: block;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-gray);
    margin-bottom: 10px;
}

.login-form input {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border-light);
    padding: 12px 0;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-sans);
    transition: border-color 0.3s;
}

.login-form input:focus {
    outline: none;
    border-color: var(--text-primary);
}

.login-form input::placeholder {
    color: var(--text-muted);
}

.login-btn {
    width: 100%;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    padding: 16px;
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    cursor: pointer;
    margin-top: 20px;
    transition: all 0.3s;
}

.login-btn:hover {
    background: var(--accent-hover);
}

.login-bg-toggle {
    position: absolute;
    bottom: 40px;
    right: 40px;
    z-index: 20;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    padding: 12px 24px;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s;
}

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

/* ========================================
   阴阳鱼切换按钮
   ======================================== */
.taiji-toggle {
    position: absolute;
    bottom: 40px;
    right: 40px;
    z-index: 20;
    width: 48px;
    height: 48px;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.3s;
    padding: 8px;
}

.taiji-toggle:hover {
    opacity: 1;
}

.taiji {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: linear-gradient(to bottom, #ffffff 50%, #000000 50%);
    position: relative;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
    animation: taiji-rotate 20s linear infinite;
}

.taiji::before,
.taiji::after {
    content: '';
    position: absolute;
    width: 50%;
    height: 50%;
    border-radius: 50%;
}

/* 黑色鱼头（上半部分）中的白点 */
.taiji::before {
    top: 0;
    left: 25%;
    background: #000000;
    border: 6px solid #ffffff;
    box-sizing: border-box;
}

/* 白色鱼头（下半部分）中的黑点 */
.taiji::after {
    bottom: 0;
    left: 25%;
    background: #ffffff;
    border: 6px solid #000000;
    box-sizing: border-box;
}

@keyframes taiji-rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* 故宫主题时的反转效果 */
[data-bg="palace"] .taiji {
    box-shadow: 0 0 30px rgba(255, 200, 100, 0.3);
}

/* ========================================
   导航栏 - 不规则设计
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--bg-glass, rgba(10, 10, 10, 0.95));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.navbar-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.1em;
}

.nav-brand span {
    color: var(--text-gray);
}

.nav-menu {
    display: flex;
    gap: 48px;
    list-style: none;
}

.nav-menu a {
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
    position: relative;
    padding-bottom: 4px;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--text-primary);
    transition: width 0.3s;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--text-primary);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-avatar {
    width: 36px;
    height: 36px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    cursor: pointer;
    transition: border-color 0.3s;
    user-select: none;
}

.nav-avatar:hover {
    border-color: var(--text-primary);
}

/* ========================================
   极简日历
   ======================================== */
.calendar {
    padding: 8px 0;
}

.calendar-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    margin-bottom: 8px;
}

.calendar-header span {
    font-size: 0.75rem;
    color: var(--text-gray);
    padding: 8px 0;
}

.calendar-body {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: default;
    transition: all 0.2s;
    position: relative;
}

.calendar-day.empty {
    cursor: default;
}

.calendar-day.has-posts {
    cursor: pointer;
    color: var(--text-primary);
    font-weight: 500;
}

.calendar-day.has-posts::after {
    content: '';
    position: absolute;
    bottom: 4px;
    width: 4px;
    height: 4px;
    background: var(--accent);
    border-radius: 50%;
}

.calendar-day.has-posts:hover {
    background: var(--bg-hover);
}

.calendar-day.today {
    border: 1px solid var(--accent);
}

.calendar-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    backdrop-filter: var(--backdrop);
    border: 1px solid var(--border);
    padding: 6px 10px;
    font-size: 0.75rem;
    white-space: nowrap;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
    pointer-events: none;
}

.calendar-day.has-posts:hover .calendar-tooltip {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   主题切换器
   ======================================== */
.theme-switcher-wrapper {
    position: relative;
}

.theme-current {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--border-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.theme-current:hover {
    border-color: var(--text-secondary);
}

.theme-current::before {
    content: '';
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-primary);
}

.theme-selector {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px;
    min-width: 140px;
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s;
    z-index: 1000;
}

.theme-selector.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.theme-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.theme-option:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.theme-option.active {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.theme-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ========================================
   磨砂毛玻璃效果
   ======================================== */
.glass {
    background: var(--bg-glass);
    backdrop-filter: var(--backdrop);
    -webkit-backdrop-filter: var(--backdrop);
    border: 1px solid var(--border);
}

/* 所有卡片组件添加毛玻璃效果 */
.form-section,
.widget,
.post-item,
.member-card,
.guestbook-item,
.comment-item,
.stat-card,
.admin-item {
    background: var(--bg-card, rgba(20, 20, 20, 0.7));
    border: 1px solid var(--border, rgba(255, 255, 255, 0.1));
    transition: background-color 0.3s, border-color 0.3s;
}

/* 支持 backdrop-filter 的浏览器添加毛玻璃效果 */
@supports (backdrop-filter: blur(20px)) or (-webkit-backdrop-filter: blur(20px)) {
    .form-section,
    .widget,
    .post-item,
    .member-card,
    .guestbook-item,
    .comment-item,
    .stat-card,
    .admin-item {
        backdrop-filter: blur(20px) saturate(180%);
        -webkit-backdrop-filter: blur(20px) saturate(180%);
    }
}

/* ========================================
   用户菜单 - 鼠标悬停下拉
   ======================================== */
.user-menu-hover {
    position: relative;
}

.user-dropdown-hover {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    min-width: 160px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s;
    z-index: 1000;
}

.user-menu-hover:hover .user-dropdown-hover {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-dropdown-hover .dropdown-item {
    display: block;
    padding: 12px 16px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all 0.2s;
    border-bottom: 1px solid var(--border);
}

.user-dropdown-hover .dropdown-item:last-child {
    border-bottom: none;
}

.user-dropdown-hover .dropdown-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* ========================================
   布局
   ======================================== */
.page {
    padding-top: 70px;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ========================================
   页面头部
   ======================================== */
.page-header-section {
    padding: 80px 0 60px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 60px;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.page-subtitle {
    color: var(--text-gray);
    font-size: 1rem;
    letter-spacing: 0.1em;
}

/* ========================================
   主内容区 - 不规则网格
   ======================================== */
.main-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 80px;
}

/* ========================================
   文章列表 - 层次设计
   ======================================== */
.posts-section {
    position: relative;
}

.posts-section::before {
    content: '';
    position: absolute;
    left: -40px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--border);
}

.post-item {
    padding: 40px 0 40px 40px;
    border-bottom: 1px solid var(--border);
    position: relative;
}

.post-item::before {
    content: '';
    position: absolute;
    left: -3px;
    top: 48px;
    width: 6px;
    height: 6px;
    background: var(--text-gray);
    transition: background 0.3s;
}

.post-item:hover::before {
    background: var(--text-primary);
}

.post-meta-line {
    display: flex;
    gap: 20px;
    margin-bottom: 16px;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.post-category {
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 4px 12px;
}

.post-date {
    color: var(--text-gray);
    line-height: 24px;
}

.post-title {
    font-size: 1.6rem;
    font-weight: 500;
    margin-bottom: 16px;
    line-height: 1.4;
}

.post-title a:hover {
    opacity: 0.8;
}

.post-excerpt {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.post-footer-line {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-gray);
}

/* ========================================
   侧边栏
   ======================================== */
.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.widget {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 32px;
    margin-bottom: 24px;
    position: relative;
}

.widget::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--text-primary);
}

.widget-title {
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-gray);
    margin-bottom: 20px;
}

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

.user-info-large {
    text-align: center;
}

.user-avatar-large {
    width: 80px;
    height: 80px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.user-name {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.user-role {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-gray);
    margin-bottom: 16px;
}

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

/* ========================================
   按钮
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    padding: 14px 28px;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s;
}

.btn:hover {
    opacity: 0.9;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
}

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

.btn-sm {
    padding: 10px 18px;
    font-size: 0.75rem;
}

.btn-danger {
    background: transparent;
    border: 1px solid #444;
    color: #888;
}

.btn-danger:hover {
    border-color: #ff4444;
    color: #ff4444;
}

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

/* ========================================
   文章详情页
   ======================================== */
.post-detail {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 0;
}

.post-detail-header {
    margin-bottom: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border);
}

.post-detail-meta {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
    font-size: 0.85rem;
    color: var(--text-gray);
}

.post-detail-title {
    font-size: 2.5rem;
    font-weight: 400;
    line-height: 1.3;
    margin-bottom: 30px;
}

.post-detail-content {
    font-size: 1.1rem;
    line-height: 2;
    color: var(--text-secondary);
}

.post-detail-content p {
    margin-bottom: 28px;
}

.post-detail-content h2 {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    margin: 48px 0 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.post-detail-content ul,
.post-detail-content ol {
    margin-bottom: 28px;
    padding-left: 28px;
}

.post-detail-content li {
    margin-bottom: 12px;
}

.post-detail-content code {
    background: var(--bg-card);
    padding: 3px 8px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-primary);
}

.post-detail-content pre {
    background: var(--bg-card);
    padding: 24px;
    overflow-x: auto;
    margin-bottom: 28px;
    border-left: 2px solid var(--text-primary);
}

.post-detail-content pre code {
    background: none;
    padding: 0;
}

/* ========================================
   文章时间轴
   ======================================== */
.post-timeline {
    position: relative;
    margin: 40px 0 60px;
    padding-left: 24px;
}

.timeline-line {
    position: absolute;
    left: 5px;
    top: 8px;
    bottom: 0;
    width: 1px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 16px;
}

.timeline-dot {
    position: absolute;
    left: -24px;
    top: 6px;
    width: 11px;
    height: 11px;
    background: var(--bg-primary);
    border: 2px solid var(--text-gray);
    border-radius: 50%;
}

.timeline-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.timeline-label {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-gray);
    padding: 4px 10px;
    border: 1px solid var(--border);
}

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

.post-nav {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

/* ========================================
   评论区
   ======================================== */
.comments-section {
    margin-top: 80px;
    padding-top: 60px;
    border-top: 1px solid var(--border);
}

.comments-title {
    font-size: 1.2rem;
    font-weight: 400;
    margin-bottom: 32px;
    letter-spacing: 0.05em;
}

.comment-item {
    padding: 28px 0;
    border-bottom: 1px solid var(--border);
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
}

.comment-author {
    font-weight: 500;
    color: var(--text-primary);
}

.comment-date {
    font-size: 0.85rem;
    color: var(--text-gray);
}

.comment-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========================================
   表单
   ======================================== */
.form-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 40px;
    margin-top: 40px;
}

.form-group {
    margin-bottom: 28px;
}

.form-group label {
    display: block;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-gray);
    margin-bottom: 12px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    background: var(--bg-primary, #0a0a0a);
    border: 1px solid var(--border, rgba(255,255,255,0.1));
    padding: 14px 18px;
    color: var(--text-primary, #ffffff);
    font-size: 1rem;
    font-family: var(--font-sans);
    transition: all 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--text-primary, #ffffff);
    background: var(--bg-primary, #0a0a0a);
}

.form-group textarea {
    resize: vertical;
    line-height: 1.7;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted, #444444);
    opacity: 0.7;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.form-hint {
    font-size: 0.85rem;
    color: var(--text-gray);
    margin-top: 8px;
}

/* ========================================
   留言板
   ======================================== */
.guestbook-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.guestbook-form-section {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.guestbook-list {
    max-height: 800px;
    overflow-y: auto;
}

.guestbook-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 28px;
    margin-bottom: 20px;
}

.guestbook-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.guestbook-author {
    font-weight: 500;
}

.guestbook-date {
    font-size: 0.85rem;
    color: var(--text-gray);
}

.guestbook-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========================================
   关于页
   ======================================== */
.about-layout {
    max-width: 800px;
    margin: 0 auto;
}

.about-intro {
    text-align: center;
    margin-bottom: 80px;
}

.about-avatar {
    width: 120px;
    height: 120px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    margin: 0 auto 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.about-intro h2 {
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 12px;
}

.about-intro p {
    color: var(--text-gray);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-size: 0.85rem;
}

.about-content-block {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 48px;
    margin-bottom: 32px;
}

.about-content-block h3 {
    font-size: 1rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-gray);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.about-content-block p {
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: 16px;
}

.members-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 20px;
}

.member-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    padding: 24px;
    text-align: center;
}

.member-avatar {
    width: 60px;
    height: 60px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.member-name {
    font-weight: 500;
    margin-bottom: 4px;
}

.member-role {
    font-size: 0.75rem;
    color: var(--text-gray);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* ========================================
   管理后台
   ======================================== */
.admin-layout {
    max-width: 1000px;
    margin: 0 auto;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 48px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.admin-title {
    font-size: 1.5rem;
    font-weight: 400;
}

.admin-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 48px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 28px;
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-gray);
}

.admin-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.admin-tab {
    background: transparent;
    border: none;
    color: var(--text-gray);
    padding: 16px 24px;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.3s;
}

.admin-tab:hover {
    color: var(--text-secondary);
}

.admin-tab.active {
    color: var(--text-primary);
    border-bottom-color: var(--text-primary);
}

.admin-content {
    display: none;
}

.admin-content.active {
    display: block;
}

.admin-section-title {
    font-size: 1rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-gray);
    margin-bottom: 24px;
}

.admin-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 24px;
    margin-bottom: 16px;
}

.admin-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.status-badge {
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 4px 10px;
    border: 1px solid;
}

.status-badge.pending {
    color: #f5a623;
    border-color: #f5a623;
}

.status-badge.published {
    color: #7ed321;
    border-color: #7ed321;
}

.status-badge.draft {
    color: var(--text-gray);
    border-color: var(--border-light);
}

.role-badge {
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 4px 10px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
}

.role-badge.admin {
    color: var(--text-primary);
    border-color: var(--text-primary);
}

.admin-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.user-avatar-small {
    width: 40px;
    height: 40px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

/* 背景设置 */
.bg-preview {
    width: 100%;
    height: 200px;
    background-size: cover;
    background-position: center;
    border: 1px solid var(--border);
    margin-bottom: 24px;
}

.bg-input-group {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.bg-input-group input {
    flex: 1;
}

/* ========================================
   空状态
   ======================================== */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-gray);
}

/* ========================================
   提示消息
   ======================================== */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-glass, rgba(10, 10, 10, 0.95));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    padding: 16px 32px;
    color: var(--text-primary);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    z-index: 2000;
    opacity: 0;
    transition: all 0.3s;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.error {
    border-color: #ff4444;
    color: #ff6666;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    border-top: 1px solid var(--border);
    padding: 40px 0;
    margin-top: 120px;
    text-align: center;
}

.footer p {
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    color: var(--text-gray);
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--border);
}

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

/* ========================================
   响应式
   ======================================== */
@media (max-width: 900px) {
    .main-layout,
    .guestbook-layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        margin-top: 60px;
    }

    .nav-menu {
        display: none;
    }

    .posts-section::before {
        display: none;
    }

    .post-item {
        padding-left: 0;
    }

    .post-item::before {
        display: none;
    }

    .admin-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .login-box {
        padding: 32px 24px;
    }

    .container,
    .navbar-inner {
        padding: 0 20px;
    }

    .post-detail-title {
        font-size: 1.8rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .admin-stats {
        grid-template-columns: 1fr;
    }

    .admin-tabs {
        flex-wrap: wrap;
    }
}

/* ========================================
   阅读进度条
   ======================================== */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--text-primary);
    z-index: 1000;
    transition: width 0.1s;
}

/* ========================================
   返回顶部按钮
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 48px;
    height: 48px;
    background: var(--bg-glass, var(--bg-card));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 99;
    font-size: 1.2rem;
}

.back-to-top:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
    transform: translateY(-4px);
}

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

/* ========================================
   文章目录导航 (TOC)
   ======================================== */
.toc-sidebar {
    position: fixed;
    left: 40px;
    top: 120px;
    width: 200px;
    max-height: calc(100vh - 160px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.toc-sidebar.visible {
    opacity: 1;
    visibility: visible;
}

.toc-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-gray);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

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

.toc-list li {
    margin: 8px 0;
}

.toc-list a {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 4px 0;
    border-left: 2px solid transparent;
    padding-left: 12px;
    transition: all 0.2s;
}

.toc-list a:hover {
    color: var(--text-primary);
    border-left-color: var(--border-light);
}

.toc-list a.active {
    color: var(--text-primary);
    border-left-color: var(--text-primary);
}

.toc-list .toc-h2 {
    padding-left: 12px;
}

.toc-list .toc-h3 {
    padding-left: 24px;
    font-size: 0.8rem;
}

/* ========================================
   代码高亮
   ======================================== */
pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 20px;
    overflow-x: auto;
    margin: 24px 0;
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 3px;
}

pre code {
    background: none;
    padding: 0;
    border-radius: 0;
}

/* 代码语言标签 */
pre[data-language]::before {
    content: attr(data-language);
    display: block;
    font-size: 0.75rem;
    color: var(--text-gray);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ========================================
   图片灯箱
   ======================================== */
.image-lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    cursor: zoom-out;
}

.image-lightbox.active {
    opacity: 1;
    visibility: visible;
}

.image-lightbox img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    transform: scale(0.9);
    transition: transform 0.3s;
}

.image-lightbox.active img {
    transform: scale(1);
}

.image-lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 文章内容中的图片可点击 */
.post-detail-content img {
    cursor: zoom-in;
    transition: transform 0.3s;
}

.post-detail-content img:hover {
    transform: scale(1.01);
}

/* ========================================
   文章互动按钮
   ======================================== */
.post-actions {
    display: flex;
    gap: 16px;
    padding: 32px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin: 48px 0;
}

.post-action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s;
}

.post-action-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.post-action-btn.active {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

.post-action-btn svg {
    width: 18px;
    height: 18px;
}

/* ========================================
   文章标签
   ======================================== */
.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 24px 0;
}

.post-tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.post-tag:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

/* ========================================
   相关文章推荐
   ======================================== */
.related-posts {
    margin-top: 64px;
    padding-top: 48px;
    border-top: 1px solid var(--border);
}

.related-posts-title {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 24px;
    letter-spacing: 0.05em;
}

.related-posts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.related-post-card {
    padding: 20px;
    border: 1px solid var(--border);
    transition: all 0.3s;
}

.related-post-card:hover {
    border-color: var(--text-primary);
    transform: translateY(-4px);
}

.related-post-card .post-date {
    font-size: 0.75rem;
    color: var(--text-gray);
    margin-bottom: 8px;
}

.related-post-card .post-title {
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 12px;
}

.related-post-card .post-excerpt {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========================================
   阅读统计
   ======================================== */
.reading-stats {
    display: flex;
    gap: 24px;
    font-size: 0.8rem;
    color: var(--text-gray);
    margin-top: 16px;
}

.reading-stats span {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ========================================
   响应式扩展
   ======================================== */
@media (max-width: 1200px) {
    .toc-sidebar {
        display: none;
    }
    
    .related-posts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
    
    .related-posts-grid {
        grid-template-columns: 1fr;
    }
    
    .post-actions {
        flex-wrap: wrap;
    }
    
    .post-action-btn {
        flex: 1;
        justify-content: center;
    }
}