/* ========================================
   设计系统 - Design Tokens
   ======================================== */
:root {
    /* 主色调 - 现代蓝紫渐变风 */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;

    /* 辅助色 */
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --accent-cyan: #06b6d4;

    /* 中性色 */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* 语义色 */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    /* 背景色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;

    /* 文字色 */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;

    /* 边框色 */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --border-dark: #94a3b8;

    /* 阴影系统 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* 圆角系统 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-2xl: 28px;
    --radius-full: 9999px;

    /* 间距系统 (8px grid) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;

    /* 字体系统 */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 30px;
    --font-size-4xl: 36px;

    /* 行高 */
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* 过渡动画 */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* 布局 */
    --max-width: 1280px;
    --nav-height: 72px;
}

/* ========================================
   全局重置与基础样式
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #e2e8f0 100%);
    background-attachment: fixed;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

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

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

input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ========================================
   导航栏 - Navbar
   ======================================== */
.nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.nav:hover {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex !important;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

.nav-logo:hover {
    transform: scale(1.02);
}

.nav-logo img {
    width: 42px !important;
    height: 42px !important;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    object-fit: cover;
    flex-shrink: 0;
}

.nav-logo span {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.ul {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    height: 100%;
}

.nav-li {
    position: relative;
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-li::before {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 24px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-500), var(--accent-purple));
    border-radius: var(--radius-full);
    transition: transform var(--transition-normal);
}

.nav-li:hover {
    color: var(--primary-600);
    background: var(--primary-50);
}

.nav-li:hover::before {
    transform: translateX(-50%) scaleX(1);
}

.nav-li.active {
    color: var(--primary-600);
    background: linear-gradient(135deg, var(--primary-50), #faf5ff);
    font-weight: 600;
}

.nav-li.active::before {
    transform: translateX(-50%) scaleX(1);
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.menu-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--primary-600);
}

/* ========================================
   主体内容 - Main
   ======================================== */
.box {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-8) var(--space-6);
    min-height: calc(100vh - var(--nav-height));
}

.page {
    display: none;
    animation: fadeInUp 0.4s ease;
}

.page.active {
    display: block;
}

#home.page.active {
    display: flex;
}

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

/* ========================================
   导航栏滚动效果
   ======================================== */
.nav.scrolled {
    box-shadow: var(--shadow-md);
    background: rgba(255, 255, 255, 0.92);
}

/* ========================================
   首页布局 - Home
   ======================================== */
.main {
    display: flex;
    gap: var(--space-8);
    align-items: flex-start;
}

.page:not(.active).main {
    display: none;
}

.main-one {
    flex: 1 1 auto;
    min-width: 0;
}

.main-two {
    flex: 0 0 320px;
    position: sticky;
    top: calc(var(--nav-height) + var(--space-6));
}

/* 区块标题 */
.main-title,
.hot-title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
    padding: var(--space-4) var(--space-5);
    background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.main-title h2,
.hot-title h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: white;
    margin: 0;
    letter-spacing: 0.5px;
}

.main-title::before,
.hot-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-full);
}

/* 搜索筛选区 */
.search-sticky-wrapper {
    position: sticky;
    top: calc(var(--nav-height) + var(--space-3));
    z-index: 100;
    margin-bottom: var(--space-6);
    transition: all var(--transition-normal);
}

.search-sticky-wrapper.scroll-down {
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    margin-bottom: 0;
}

/* 移动端热门文章菜单 - 默认隐藏 */
.mobile-hot-section {
    display: none;
}

.search-sticky-wrapper.stuck .search-filter-bar {
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.search-sticky-wrapper.stuck .page-search-bar {
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.search-filter-bar {
    display: flex;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

.search-box {
    flex: 1 1 auto;
    min-width: 0;
}

#search-input {
    width: 100%;
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

#search-input:hover {
    background: var(--bg-tertiary);
}

#search-input:focus {
    outline: none;
    background: var(--bg-card);
    border-color: var(--primary-400);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* 自定义下拉框 */
.custom-select {
    position: relative;
    min-width: 140px;
}

.search-filter-bar .custom-select {
    flex: 0 0 140px;
    width: 140px !important;
    min-width: 140px !important;
}

.custom-select-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.custom-select-trigger:hover {
    background: var(--bg-tertiary);
}

.custom-select.open .custom-select-trigger {
    background: var(--bg-card);
    border-color: var(--primary-400);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.custom-select-arrow {
    font-size: 10px;
    color: var(--text-tertiary);
    transition: transform var(--transition-fast);
}

.custom-select.open .custom-select-arrow {
    transform: rotate(180deg);
}

.custom-select-options {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 1000;
}

.custom-select.open .custom-select-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.custom-select-option {
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 1px solid var(--border-light);
}

.custom-select-option:last-child {
    border-bottom: none;
}

.custom-select-option:hover {
    background: var(--primary-50);
    color: var(--primary-700);
}

.custom-select-option.active {
    background: linear-gradient(135deg, var(--primary-500), var(--accent-purple));
    color: white;
}

#categoryFilter {
    display: none;
}

/* ========================================
   文章卡片 - Article Card
   ======================================== */
.content-ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.content {
    position: relative;
    display: flex;
    gap: var(--space-5);
    padding: var(--space-5);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    overflow: hidden;
}

.content::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary-500), var(--accent-purple));
    transform: scaleY(0);
    transition: transform var(--transition-normal);
}

.content:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.content:hover::before {
    transform: scaleY(1);
}

.content-img-a {
    flex: 0 0 220px;
    height: 160px;
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
}

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

.content:hover .content-img {
    transform: scale(1.08);
}

.content-div {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-3);
    min-width: 0;
}

.content-div h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: var(--line-height-tight);
    color: var(--text-primary);
    transition: color var(--transition-fast);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.content:hover .content-div h2 {
    color: var(--primary-600);
}

.content-div h2 a {
    font-size: inherit;
    color: inherit;
}

.content-intro {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    color: var(--text-tertiary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.content-classify {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-top: auto;
}

.content-classify span {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.content-classify span:first-child::before {
    content: '🕐';
    font-size: 12px;
}

/* 分类标签 */
.category-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.category-tag.学习笔记 {
    background: linear-gradient(135deg, #dbeafe, #e0e7ff);
    color: var(--primary-700);
}

.category-tag.网络技术 {
    background: linear-gradient(135deg, #dcfce7, #d1fae5);
    color: #047857;SS
}

/* .category-tag.生活娱乐 {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    color: #b45309;
} */

.content-link-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    opacity: 0;
}

/* ========================================
   热门文章 - Hot Articles
   ======================================== */
.hot-ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.hot {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.hot:hover {
    background: var(--bg-secondary);
    transform: translateX(4px);
}

.hot-rank {
    flex: 0 0 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: 700;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
}

.hot:nth-child(1) .hot-rank {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: white;
    box-shadow: 0 2px 8px rgba(251, 191, 36, 0.4);
    font-size: 0;
}

.hot:nth-child(1) .hot-rank::before {
    content: '🥇';
    font-size: 14px;
}

.hot:nth-child(2) .hot-rank {
    background: linear-gradient(135deg, #e5e7eb, #9ca3af);
    color: white;
    box-shadow: 0 2px 8px rgba(156, 163, 175, 0.4);
    font-size: 0;
}

.hot:nth-child(2) .hot-rank::before {
    content: '🥈';
    font-size: 14px;
}

.hot:nth-child(3) .hot-rank {
    background: linear-gradient(135deg, #fdba74, #ea580c);
    color: white;
    box-shadow: 0 2px 8px rgba(249, 115, 22, 0.4);
    font-size: 0;
}

.hot:nth-child(3) .hot-rank::before {
    content: '🥉';
    font-size: 14px;
}

.hot-img-a {
    flex: 0 0 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.hot-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hot-div {
    flex: 1 1 auto;
    min-width: 0;
}

.hot-div a {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    line-height: var(--line-height-tight);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color var(--transition-fast);
}

.hot:hover .hot-div a {
    color: var(--primary-600);
}

/* ========================================
   分页 - Pagination
   ======================================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-10);
    flex-wrap: wrap;
}

.pagination-btn {
    min-width: 40px;
    height: 40px;
    padding: 0 var(--space-4);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pagination-btn:hover:not(:disabled):not(.active) {
    color: var(--primary-600);
    border-color: var(--primary-300);
    background: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.pagination-btn.active {
    background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-md);
}

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

.pagination-ellipsis {
    padding: 0 var(--space-2);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.pagination-input {
    width: 60px;
    height: 40px;
    padding: 0 var(--space-3);
    text-align: center;
    font-size: var(--font-size-sm);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.pagination-input:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* ========================================
   分类页面 - Category Pages
   ======================================== */
.studyNotes,
.networkTechniques,
.lifeEntertainment {
    width: 100%;
}

.StudyNotes-container,
.NetworkTechniques-container,
.lifeEntertainment-container {
    max-width: 800px;
    margin: 0 auto;
}

/* 分类页面搜索框 */
.page-search-bar {
    padding: var(--space-4);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    margin-bottom: var(--space-6);
    transition: all var(--transition-normal);
}

.page-search-bar:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-200);
}

.page-search-box {
    width: 100%;
}

.page-search-box input {
    width: 100%;
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.page-search-box input:hover {
    background: var(--bg-tertiary);
}

.page-search-box input:focus {
    outline: none;
    background: var(--bg-card);
    border-color: var(--primary-400);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.StudyNotes-ul,
.NetworkTechniques-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

/* 生活娱乐页面 */
.lifeEntertainment-content {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-5);
}

.lifeEntertainment-item {
    padding: var(--space-6);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.lifeEntertainment-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.lifeEntertainment-item-title {
    margin-bottom: var(--space-3);
}

.lifeEntertainment-item-title h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.lifeEntertainment-item-title h3 a {
    font-size: inherit;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.lifeEntertainment-item-title h3 a:hover {
    color: var(--primary-600);
}

.lifeEntertainment-item-title span {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.lifeEntertainment-item-meta {
    display: flex;
    gap: var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.code-item {
    grid-column: 1 / -1;
    padding: var(--space-6);
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border-radius: var(--radius-lg);
}

.code-title {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

#code-password {
    flex: 1 1 auto;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.8);
    transition: all var(--transition-fast);
}

#code-password:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.code-title button {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.code-title button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

#encrypted-content {
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius-md);
}

.download-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-top: var(--space-3);
}

.download-list li a {
    font-size: var(--font-size-sm);
    color: var(--primary-600);
    font-size: var(--font-size-sm);
}

#password-error {
    margin-top: var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--error);
}

/* ========================================
   音乐页面 - Music
   ======================================== */
.music {
    width: 100%;
}

.music-div {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.music-page-header {
    text-align: center;
    padding: var(--space-8) 0 var(--space-4);
}

.music-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.music-icon {
    font-size: var(--font-size-3xl);
}

.music-title h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.music-subtitle {
    font-size: var(--font-size-base);
    color: var(--text-tertiary);
    margin: 0;
}

/* ===== 底部播放器 ===== */
.global-player {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: none;
    align-items: center;
    gap: var(--space-6);
    padding: var(--space-3) var(--space-6);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-light);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
    user-select: none;
}

.global-player.visible {
    display: flex;
}

body.has-player {
    padding-bottom: 90px;
}

.player-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    flex-shrink: 0;
    width: 280px;
    min-width: 0;
}

.global-player .player-cover {
    position: relative;
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transform: rotate(0deg);
    animation: coverRotate 20s linear infinite;
    animation-play-state: paused;
}

.global-player .player-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.global-player.playing .player-cover {
    animation-play-state: running;
}

.global-player.playing .player-cover img {
    animation: none;
}

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

.global-player .player-song-info {
    min-width: 0;
    flex: 1;
}

.global-player .player-song-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 2px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

.global-player .player-song-artist {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.global-player .player-lyric {
    font-size: 12px;
    color: var(--primary-500);
    margin: 2px 0 0 0;
    white-space: nowrap;
    overflow: hidden;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
    max-width: 100%;
    text-align: center;
}

.global-player .player-lyric .lyric-text {
    display: inline-block;
    white-space: nowrap;
    position: relative;
}

.global-player .player-lyric .melody-text {
    color: var(--text-secondary);
    font-style: italic;
}

.player-center {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    min-width: 0;
    max-width: 600px;
    margin: 0 auto;
}

.player-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-5);
}

.control-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    padding: 0;
}

.control-btn:hover {
    color: var(--primary-600);
    background: var(--primary-50);
    transform: scale(1.05);
}

.control-btn:active {
    transform: scale(0.95);
}

.control-btn.play-btn {
    width: 44px;
    height: 44px;
    font-size: var(--font-size-lg);
    color: white;
    background: linear-gradient(135deg, var(--primary-500), var(--accent-purple));
    box-shadow: var(--shadow-md);
}

.control-btn.play-btn:hover {
    transform: scale(1.08);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
    color: white;
}

.control-btn.play-btn .fa-pause {
    display: none;
}

.global-player.playing .control-btn.play-btn .fa-play {
    display: none;
}

.global-player.playing .control-btn.play-btn .fa-pause {
    display: inline;
}

.player-progress {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
}

.time-text {
    font-size: 11px;
    color: var(--text-tertiary);
    font-variant-numeric: tabular-nums;
    min-width: 40px;
    text-align: center;
    flex-shrink: 0;
    line-height: 1;
}

.progress-bar-wrapper {
    position: relative;
    flex: 1;
    height: 20px;
    display: flex;
    align-items: center;
    cursor: pointer;
}

.progress-bar-bg {
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 6px;
    background: var(--border-light);
    border-radius: var(--radius-full);
    overflow: hidden;
    transition: background-color var(--transition-fast);
}

.progress-bar-wrapper:hover .progress-bar-bg {
    background: var(--border-medium);
}

.progress-bar-fill {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 6px;
    width: 0%;
    background: var(--primary-500);
    border-radius: var(--radius-full);
    transition: width 0.1s linear, background-color var(--transition-fast);
}

.progress-bar-wrapper:hover .progress-bar-fill {
    background: var(--primary-600);
}

.progress-bar-thumb {
    position: absolute;
    top: 50%;
    left: 0%;
    transform: translate(-50%, -50%) scale(1);
    width: 12px;
    height: 12px;
    background: var(--primary-500);
    border: 2px solid white;
    border-radius: 50%;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
    pointer-events: none;
    transition: transform var(--transition-fast), background-color var(--transition-fast);
    z-index: 2;
}

.progress-bar-wrapper:hover .progress-bar-thumb {
    transform: translate(-50%, -50%) scale(1.15);
}

.progress-bar-wrapper:active .progress-bar-thumb {
    transform: translate(-50%, -50%) scale(1.3);
    background: var(--primary-600);
}

#progressBar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    cursor: pointer;
    z-index: 3;
    margin: 0;
    opacity: 0;
}

.player-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
    width: 280px;
    justify-content: flex-end;
}

.volume-control {
    position: relative;
    display: flex;
    align-items: center;
}

.volume-control::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 20px;
    background: transparent;
}

.volume-vertical-container {
    position: absolute;
    bottom: calc(100% + 10px);
    right: 50%;
    transform: translateX(50%);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
    pointer-events: none;
}

.volume-control:hover .volume-vertical-container,
.volume-vertical-container.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(50%) translateY(-4px);
    pointer-events: auto;
}

.volume-slider-vertical {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-2);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.volume-track {
    position: relative;
    width: 6px;
    height: 100px;
    background: var(--border-light);
    border-radius: var(--radius-full);
    overflow: visible;
}

.volume-fill {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: var(--primary-500);
    border-radius: var(--radius-full);
    pointer-events: none;
    transition: height 0.05s linear;
}

.volume-thumb {
    position: absolute;
    bottom: calc(50% - 6px);
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 12px;
    background: white;
    border: 2px solid var(--primary-500);
    border-radius: 50%;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
    pointer-events: none;
    transition: bottom 0.05s linear, transform var(--transition-fast);
}

.volume-control:hover .volume-thumb {
    transform: translateX(-50%) scale(1.15);
}

.volume-value {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 32px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

#loopBtn.looping {
    color: var(--primary-600);
}

#loopBtn.looping::before {
    content: '';
    position: absolute;
    top: 4px;
    right: 4px;
    width: 6px;
    height: 6px;
    background: var(--primary-500);
    border-radius: 50%;
}

#loopBtn {
    position: relative;
}

/* ===== 音乐列表区 ===== */
.music-section {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-light);
}

.section-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.section-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.section-count {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    background: var(--bg-secondary);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
}

.section-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-lg);
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    user-select: none;
}

.section-btn:hover {
    background: var(--primary-100);
    color: var(--primary-600);
}

.section-btn.danger:hover {
    background: var(--error-100);
    color: var(--error-600);
}

.section-btn i {
    font-size: 12px;
}

.music-ul {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--space-5);
    list-style: none;
    padding: 0;
    margin: 0;
    min-height: 120px;
}

.music-ul > p {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-secondary);
    padding: var(--space-12) var(--space-4);
    margin: 0;
    line-height: 1.8;
}

.music-li {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius-xl);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    background: var(--bg-secondary);
}

.music-li:hover {
    transform: translateY(-6px) scale(1.03);
    box-shadow: var(--shadow-2xl);
}

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

.music-li:hover img {
    transform: scale(1.1);
}

.music-li::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(0, 0, 0, 0.8));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.music-li:hover::after {
    opacity: 1;
}

.music-play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: white;
    background: linear-gradient(135deg, var(--primary-500), var(--accent-purple));
    border-radius: 50%;
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-normal);
    z-index: 2;
    padding-left: 4px;
}

.music-li:hover .music-play-overlay {
    transform: translate(-50%, -50%) scale(1);
}

.music-div-span {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-4) var(--space-3) var(--space-3);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.85), transparent);
    color: white;
    font-size: var(--font-size-xs);
    z-index: 1;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.music-li:hover .music-div-span {
    opacity: 1;
}

.music-div-span span {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
    font-weight: 500;
}

.music-li.playing {
    box-shadow: 0 0 0 3px var(--primary-400), var(--shadow-2xl);
}

/* ===== 上传区 ===== */
.upload-music {
    padding: var(--space-10);
    text-align: center;
    background: linear-gradient(145deg, var(--bg-card), var(--bg-secondary));
    border: 2px dashed var(--border-medium);
    border-radius: var(--radius-2xl);
    transition: all var(--transition-normal);
}

.upload-music:hover {
    border-color: var(--primary-400);
    background: linear-gradient(145deg, var(--primary-50), var(--bg-card));
}

.upload-icon {
    font-size: 48px;
    margin-bottom: var(--space-4);
}

.upload-music h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--space-5) 0;
}

.upload-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary-500), var(--accent-purple));
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-lg);
}

.upload-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-2xl);
}

.upload-btn:active {
    transform: translateY(-1px);
}

.upload-music input[type="file"] {
    display: none;
}

.upload-hint {
    margin-top: var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

#coverPreview {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-3);
    margin-top: var(--space-6);
}

#coverPreview img {
    width: 64px;
    height: 64px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* ===== 工具按钮 ===== */
.music-tools {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
}

.tool-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tool-btn:hover {
    color: var(--primary-600);
    border-color: var(--primary-300);
    background: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tool-btn.danger:hover {
    color: var(--error-600);
    border-color: var(--error-300);
    background: var(--error-50);
}

/* ===== 弹窗 ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius-2xl);
    width: 90%;
    max-width: 480px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transform: translateY(20px) scale(0.95);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-content {
    transform: translateY(0) scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--border-light);
}

.modal-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-6);
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border-light);
}

.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-lg);
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

/* ===== 表单 ===== */
.form-group {
    margin-bottom: var(--space-5);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.form-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    outline: none;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.form-select:focus {
    border-color: var(--primary-400);
    background: var(--bg-card);
}

.form-input-small {
    width: 70px;
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    outline: none;
    transition: all var(--transition-fast);
    text-align: center;
}

.form-input-small:focus {
    border-color: var(--primary-400);
    background: var(--bg-card);
}

.checkbox-group {
    display: flex;
    gap: var(--space-4);
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    user-select: none;
}

.checkbox-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-500);
    cursor: pointer;
}

.checkbox-item span {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.range-group {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.range-group span {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.form-hint {
    font-size: 12px;
    color: var(--text-tertiary);
    margin: var(--space-2) 0 0 0;
    line-height: 1.4;
}

/* ===== 自定义下拉 ===== */
.custom-select {
    position: relative;
    width: 100%;
}

.custom-select-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.custom-select-header:hover {
    border-color: var(--primary-300);
    background: var(--bg-card);
}

.custom-select.open .custom-select-header {
    border-color: var(--primary-400);
    background: var(--bg-card);
}

.custom-select-arrow {
    font-size: 10px;
    color: var(--text-tertiary);
    transition: transform var(--transition-fast);
}

.custom-select.open .custom-select-arrow {
    transform: rotate(180deg);
    color: var(--primary-500);
}

.custom-select-options {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: all var(--transition-fast);
    z-index: 100;
    overflow: hidden;
}

.custom-select.open .custom-select-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.custom-select-option {
    padding: var(--space-3) var(--space-4);
    cursor: pointer;
    transition: background var(--transition-fast);
    border-bottom: 1px solid var(--border-light);
}

.custom-select-option:last-child {
    border-bottom: none;
}

.custom-select-option:hover {
    background: var(--primary-50);
}

.custom-select-option.selected {
    background: var(--primary-100);
}

.option-title {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.option-desc {
    display: block;
    font-size: 12px;
    color: var(--text-tertiary);
    line-height: 1.4;
}

/* ===== 文件夹路径输入框 ===== */
.folder-path-input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.folder-path-icon {
    position: absolute;
    left: var(--space-4);
    color: var(--primary-500);
    font-size: var(--font-size-base);
    z-index: 1;
}

.folder-path-input-group .form-input {
    padding-left: 40px;
    width: 100%;
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    font-family: 'Courier New', monospace;
}

.folder-path-input-group .form-input:focus {
    outline: none;
    border-color: var(--primary-400);
    background: var(--bg-card);
    box-shadow: 0 0 0 3px var(--primary-100);
}

/* ===== 扫描进度 ===== */
.scan-progress-info {
    text-align: center;
}

.scan-current-song {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.scan-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-3);
}

.scan-progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

.scan-progress-text {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* ========================================
   响应式设计 - Responsive
   ======================================== */

/* 大屏桌面 (1200px以下) */
@media (max-width: 1200px) {
    :root {
        --max-width: 100%;
    }

    .main-two {
        flex: 0 0 280px;
    }

    .content-img-a {
        flex: 0 0 200px;
        height: 150px;
    }
}

/* 平板横屏 (1024px以下) */
@media (max-width: 1024px) {
    .nav-container {
        padding: 0 var(--space-5);
    }

    .nav-li {
        padding: var(--space-2) var(--space-3);
        font-size: var(--font-size-sm);
    }

    .main {
        gap: var(--space-6);
    }

    .content {
        padding: var(--space-4);
        gap: var(--space-4);
    }

    .content-img-a {
        flex: 0 0 180px;
        height: 135px;
    }
}

/* 平板竖屏 (900px以下) */
@media (max-width: 900px) {
    :root {
        --nav-height: 64px;
    }

    .main {
        flex-direction: column;
    }

    .main-two {
        flex: 0 0 auto;
        width: 100%;
        position: static;
        order: -1;
    }

    .hot-ul {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: var(--space-3);
    }

    .box {
        padding: var(--space-5);
    }

    .section-title {
        font-size: var(--font-size-xl);
        padding: var(--space-4) var(--space-5);
    }

    .content-img-a {
        flex: 0 0 200px;
        height: 150px;
    }
}

/* 移动端 (768px以下) */
@media (max-width: 768px) {
    :root {
        --nav-height: 60px;
    }

    body {
        font-size: 15px;
    }

    .box {
        padding: var(--space-4);
    }

    /* 移动端导航 */
    .menu-toggle {
        display: flex;
    }

    .ul {
        position: fixed;
        top: var(--nav-height);
        left: -100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        width: 280px;
        height: calc(100vh - var(--nav-height));
        padding: var(--space-4) 0;
        background: var(--bg-card);
        box-shadow: var(--shadow-xl);
        z-index: 999;
        transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
    }

    .ul.active {
        left: 0;
    }

    .nav-li {
        padding: var(--space-4) var(--space-6);
        font-size: var(--font-size-base);
        border-radius: 0;
        justify-content: flex-start;
    }

    .nav-li::before {
        display: none;
    }

    .nav-li.active {
        background: linear-gradient(90deg, var(--primary-50), transparent);
        border-left: 4px solid var(--primary-500);
    }

    /* 移动端热门文章菜单 */
    .mobile-hot-section {
        display: block;
        margin-top: var(--space-4);
        padding: 0 var(--space-4);
        border-top: 1px solid var(--border-light);
    }

    .mobile-hot-title {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: var(--space-4) var(--space-2);
        font-size: var(--font-size-sm);
        font-weight: 600;
        color: var(--text-secondary);
        cursor: pointer;
    }

    .mobile-hot-toggle {
        font-size: var(--font-size-xs);
        color: var(--text-tertiary);
        font-weight: 400;
    }

    .mobile-hot-section.open .mobile-hot-toggle {
        color: var(--primary-color);
    }

    .mobile-hot-ul {
        display: none;
        flex-direction: column;
        gap: var(--space-2);
        padding-bottom: var(--space-4);
    }

    .mobile-hot-section.open .mobile-hot-ul {
        display: flex;
    }

    .mobile-hot-ul .hot {
        padding: var(--space-3);
        border-radius: var(--radius-md);
    }

    .mobile-hot-ul .hot:hover {
        background: var(--bg-secondary);
        transform: none;
    }

    /* 隐藏首页热门文章侧边栏 */
    .main-two {
        display: none;
    }

    /* 搜索筛选区 */
    .search-filter-bar {
        flex-direction: row;
        gap: var(--space-3);
    }

    .search-box {
        width: 100%;
    }

    .custom-select {
        width: 100%;
        min-width: auto;
    }

    .custom-select-options {
        position: fixed;
        top: 50% !important;
        left: 50% !important;
        right: auto !important;
        transform: translate(-50%, -50%) scale(0.95);
        min-width: 260px;
        max-height: 70vh;
        overflow-y: auto;
    }

    .custom-select.open .custom-select-options {
        transform: translate(-50%, -50%) scale(1);
    }

    /* 文章卡片 - 移动端上下布局 */
    .content {
        flex-direction: column;
        gap: var(--space-4);
        padding: var(--space-4);
    }

    .content::before {
        width: 100%;
        height: 4px;
        top: 0;
        left: 0;
        right: 0;
        bottom: auto;
        transform: scaleX(0);
    }

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

    .content-img-a {
        flex: 0 0 auto;
        width: 100%;
        height: 200px;
    }

    .content-div h2 {
        font-size: var(--font-size-lg);
    }

    /* 热门文章 - 移动端 */
    .hot-ul {
        grid-template-columns: 1fr;
    }

    /* 音乐页面 */
    .music-div {
        padding: var(--space-5) var(--space-4);
    }

    .music-title h2 {
        font-size: var(--font-size-2xl);
    }

    .global-player {
        padding: var(--space-2) var(--space-4);
        gap: var(--space-3);
    }

    body.has-player {
        padding-bottom: 70px;
    }

    .player-left {
        width: auto;
        max-width: 180px;
    }

    .global-player .player-cover {
        width: 48px;
        height: 48px;
    }

    .global-player .player-song-title {
        font-size: var(--font-size-xs);
    }

    .global-player .player-song-artist {
        font-size: 10px;
    }

    .player-right {
        width: auto;
    }

    .volume-vertical-container {
        display: none;
    }

    .volume-control:hover .volume-vertical-container {
        display: none;
    }

    .music-section {
        padding: var(--space-4);
    }

    .music-ul {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: var(--space-3);
    }

    .upload-music {
        padding: var(--space-6) var(--space-4);
    }

    .music-tools {
        flex-direction: column;
    }

    .tool-btn {
        width: 100%;
        justify-content: center;
    }

    /* 生活娱乐 */
    .lifeEntertainment-content {
        grid-template-columns: 1fr;
    }

    /* 分页 */
    .pagination {
        gap: var(--space-1);
    }

    .pagination-btn {
        min-width: 38px;
        height: 38px;
        padding: 0 var(--space-2);
        font-size: var(--font-size-sm);
    }

    .pagination-input {
        width: 50px;
        height: 38px;
    }
}

/* 小屏手机 (480px以下) */
@media (max-width: 480px) {
    :root {
        --nav-height: 56px;
    }

    .nav-container {
        padding: 0 var(--space-4);
    }

    .nav-logo span {
        display: none;
    }

    .nav-logo img {
        width: 36px !important;
        height: 36px !important;
    }

    .box {
        padding: var(--space-3);
    }

    .section-title {
        font-size: var(--font-size-lg);
        padding: var(--space-3) var(--space-4);
    }

    .content {
        padding: var(--space-3);
    }

    .content-img-a {
        height: 180px;
    }

    .content-div h2 {
        font-size: var(--font-size-base);
    }

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

    .upload-music {
        padding: var(--space-5) var(--space-3);
    }

    .global-player {
        padding: var(--space-2) var(--space-3);
        gap: var(--space-2);
    }

    body.has-player {
        padding-bottom: 60px;
    }

    .player-left {
        max-width: 120px;
        gap: var(--space-2);
    }

    .global-player .player-cover {
        width: 40px;
        height: 40px;
    }

    .global-player .player-song-title {
        font-size: 11px;
    }

    .global-player .player-song-artist {
        display: none;
    }

    .player-controls {
        gap: var(--space-3);
    }

    .control-btn {
        width: 30px;
        height: 30px;
        font-size: var(--font-size-sm);
    }

    .control-btn.play-btn {
        width: 38px;
        height: 38px;
        font-size: var(--font-size-base);
    }

    .player-progress {
        display: none;
    }

    .player-right {
        gap: var(--space-2);
    }

    #loopBtn {
        display: none;
    }

    .pagination-btn {
        min-width: 34px;
        height: 34px;
        font-size: var(--font-size-xs);
    }
}

/* ========================================
   滚动条美化
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* ========================================
   页面淡入动画
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.page {
    animation: fadeInUp 0.4s ease;
}

.content:nth-child(1) { animation-delay: 0.05s; }
.content:nth-child(2) { animation-delay: 0.1s; }
.content:nth-child(3) { animation-delay: 0.15s; }
.content:nth-child(4) { animation-delay: 0.2s; }
.content:nth-child(5) { animation-delay: 0.25s; }

/* ========================================
   空状态样式
   ======================================== */
.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-6);
    color: var(--text-tertiary);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.empty-state-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.empty-state-desc {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* ========================================
   移动端安全区域适配
   ======================================== */
@supports (padding: max(0px)) {
    .nav {
        padding-top: max(0px, env(safe-area-inset-top));
    }

    .global-player {
        padding-bottom: max(var(--space-3), env(safe-area-inset-bottom));
    }
}

/* ========================================
   工具类
   ======================================== */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

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

/* ========================================
   页脚 - Footer
   ======================================== */
.footer {
    background: linear-gradient(135deg, var(--gray-800), var(--gray-900));
    color: rgba(255, 255, 255, 0.8);
    margin-top: var(--space-16);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-12) var(--space-6) var(--space-6);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-10);
    margin-bottom: var(--space-10);
}

.footer-section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: white;
    margin-bottom: var(--space-4);
    position: relative;
    padding-bottom: var(--space-2);
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-400), var(--accent-purple));
    border-radius: var(--radius-full);
}

.footer-section p {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    color: rgba(255, 255, 255, 0.6);
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-section ul li {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition-fast);
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--primary-400);
}

.footer-bottom {
    padding-top: var(--space-6);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
}

/* 页脚响应式 */
@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}