/* ================================================
   网盘链接转二维码管理系统 - 简洁优雅风格
   ================================================ */

/* CSS Variables - 现代化色彩系统 */
:root {
    /* 主色调 */
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.1);
    
    /* 辅助色 */
    --success-color: #10b981;
    --success-hover: #059669;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    
    /* 中性色 */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* 阴影系统 */
    --shadow-sm: 0 1px 2px 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);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* 侧边栏 */
    --sidebar-width: 260px;
    --sidebar-bg: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
}

/* Global Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ================================================
   Sidebar - 现代化侧边栏
   ================================================ */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    color: white;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.sidebar-header {
    padding: 24px;
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.sidebar-header h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
    color: white;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-header h2::before {
    content: '📦';
    font-size: 24px;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
}

.sidebar-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-nav li {
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    transition: all var(--transition-normal);
}

.sidebar-nav a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateX(4px);
}

.sidebar-nav a.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

/* ================================================
   Main Content - 主内容区
   ================================================ */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    background: var(--bg-primary);
}

/* Top Navigation */
.top-nav {
    background: var(--bg-secondary);
    padding: 20px 32px;
    margin: 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.top-nav h1 {
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.logout-btn {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 10px 20px;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.logout-btn:hover {
    background: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Page Content */
.page-content {
    padding: 32px;
}

/* ================================================
   Dashboard Cards - 仪表盘卡片
   ================================================ */
.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.card {
    background: var(--bg-secondary);
    padding: 28px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: left;
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), #818cf8);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

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

.card h3 {
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card .number {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card .desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 8px;
}

/* Card variants */
.card.success::before {
    background: linear-gradient(90deg, var(--success-color), #34d399);
}

.card.warning::before {
    background: linear-gradient(90deg, var(--warning-color), #fbbf24);
}

.card.danger::before {
    background: linear-gradient(90deg, var(--danger-color), #f87171);
}

/* ================================================
   Chart Container - 图表容器
   ================================================ */
.chart-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-md);
    margin-bottom: 32px;
    border: 1px solid var(--border-light);
}

.chart-container h3 {
    margin: 0 0 24px 0;
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
}

#scanChart {
    height: 280px !important;
    width: 100% !important;
}

/* ================================================
   Table Styles - 表格样式
   ================================================ */
.table-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-bottom: 24px;
    border: 1px solid var(--border-light);
}

.table-container h3 {
    padding: 20px 24px;
    margin: 0;
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.table-container table {
    width: 100%;
    border-collapse: collapse;
    table-layout: auto;
}

.table-container th,
.table-container td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
    font-size: 13px;
    white-space: nowrap;
}

.table-container th {
    background: var(--bg-primary);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.table-container tr {
    transition: background-color var(--transition-fast);
}

.table-container tbody tr:hover {
    background: var(--bg-tertiary);
}

.table-container tbody tr:last-child td {
    border-bottom: none;
}

/* Text alignment utilities */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

/* QR Image in table */
.table-container img[src*=".png"] {
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

.table-container img[src*=".png"]:hover {
    transform: scale(1.1);
}

/* ================================================
   Form Styles - 表单样式
   ================================================ */
.form-container {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid var(--border-light);
}

.form-container h2 {
    margin-bottom: 32px;
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 600;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--text-primary);
    background: var(--bg-secondary);
    transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-light);
}

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

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* Upload Info Box */
.upload-info {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border: 1px solid #bfdbfe;
    border-left: 4px solid var(--primary-color);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    margin-bottom: 24px;
    font-size: 14px;
    color: #1e40af;
}

.upload-info h4 {
    margin: 0 0 12px 0;
    color: var(--primary-color);
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.upload-info h4::before {
    content: '💡';
}

.upload-info ul {
    margin: 12px 0;
    padding-left: 20px;
}

.upload-info li {
    margin-bottom: 8px;
    line-height: 1.6;
}

.upload-info code {
    background: rgba(99, 102, 241, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 13px;
    color: var(--primary-color);
}

.upload-info .example {
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 13px;
    margin: 12px 0;
    border: 1px dashed var(--border-color);
    overflow-x: auto;
}

/* ================================================
   Button Styles - 按钮样式
   ================================================ */
.btn {
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: var(--shadow-sm);
}

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

.btn:active {
    transform: translateY(0);
}

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

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

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

.btn-danger {
    background: var(--danger-color);
}

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

.btn-warning {
    background: var(--warning-color);
    color: white;
}

.btn-small {
    padding: 8px 16px;
    font-size: 13px;
    border-radius: var(--radius-sm);
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-icon {
    padding: 10px;
    width: 40px;
    height: 40px;
}

/* ================================================
   Alert Styles - 提示信息
   ================================================ */
.alert {
    padding: 16px 20px;
    margin-bottom: 24px;
    border-radius: var(--radius-md);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    color: #92400e;
    border: 1px solid #fde68a;
}

.alert-info {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

/* ================================================
   Pagination - 分页
   ================================================ */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 32px 0;
    gap: 8px;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    text-decoration: none;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-normal);
}

.pagination a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.pagination .active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination .disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* ================================================
   Login Page - 登录页面
   ================================================ */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(5%, 5%); }
}

.login-container {
    background: var(--bg-secondary);
    padding: 48px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 440px;
    width: 100%;
    text-align: center;
    position: relative;
    z-index: 1;
    animation: slideUp 0.6s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-container .logo {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), #818cf8);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 40px;
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

.login-container h2 {
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 28px;
    font-weight: 700;
}

.login-container .subtitle {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 32px;
}

.login-form .form-group {
    text-align: left;
}

.login-form .form-group label {
    font-size: 14px;
    margin-bottom: 8px;
}

.login-form .btn {
    width: 100%;
    margin-top: 8px;
    padding: 16px;
    font-size: 16px;
    border-radius: var(--radius-md);
}

/* ================================================
   Resource View Page - 资源详情页
   ================================================ */
.view-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 20px;
}

.view-container {
    background: var(--bg-secondary);
    padding: 48px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    text-align: center;
    max-width: 480px;
    width: 100%;
    animation: slideUp 0.5s ease;
}

.view-container .icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--success-color), #34d399);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 48px;
    box-shadow: 0 8px 32px rgba(16, 185, 129, 0.3);
}

.view-container h2 {
    color: var(--text-primary);
    margin-bottom: 24px;
    font-size: 24px;
    font-weight: 600;
}

.view-container .countdown {
    color: var(--text-secondary);
    font-size: 16px;
    margin: 32px 0;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.view-container .countdown strong {
    color: var(--primary-color);
    font-size: 20px;
}

.view-container .tip {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 24px;
}

.view-container .btn {
    min-width: 200px;
    padding: 16px 32px;
}

/* ================================================
   Resource List - 资源列表
   ================================================ */
.resource-list {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--border-light);
}

.resource-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.resource-header h1 {
    color: var(--text-primary);
    font-size: 20px;
    font-weight: 600;
}

.resource-header .actions {
    display: flex;
    gap: 12px;
}

.resource-table {
    width: 100%;
    border-collapse: collapse;
}

.resource-table th,
.resource-table td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.resource-table th {
    background: var(--bg-primary);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.resource-table tbody tr {
    transition: background-color var(--transition-fast);
}

.resource-table tbody tr:hover {
    background: var(--bg-tertiary);
}

.resource-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* ================================================
   Landing Page - 落地页
   ================================================ */
.landing-page {
    min-height: 100vh;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.landing-container {
    background: var(--bg-secondary);
    padding: 48px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    text-align: center;
    max-width: 500px;
    width: 100%;
    animation: slideUp 0.6s ease;
}

.landing-wrapper {
    text-align: center;
}

.landing-wrapper .landing-qr {
    max-width: 220px;
    width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.25);
    margin-bottom: 24px;
}

.landing-wrapper .qr-placeholder {
    width: 220px;
    height: 220px;
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 64px;
}

.landing-wrapper .landing-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding: 0 16px;
}

.landing-wrapper .landing-tip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #e0e7ff, #c7d2fe);
    color: #4338ca;
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
}

.landing-wrapper .tip-icon {
    font-size: 18px;
}

/* ================================================
   Responsive Design - 响应式设计
   ================================================ */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 80px;
    }
    
    .sidebar-header h2 span {
        display: none;
    }
    
    .sidebar-nav a span {
        display: none;
    }
    
    .sidebar-nav a {
        justify-content: center;
        padding: 16px;
    }
    
    .sidebar-nav a::before {
        font-size: 24px;
        margin-right: 0;
    }
    
    .top-nav {
        padding: 16px 24px;
    }
    
    .page-content {
        padding: 24px;
    }
    
    .dashboard-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 0;
    }
    
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }
    
    .sidebar.open {
        transform: translateX(0);
        width: 260px;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .top-nav {
        padding: 16px 20px;
    }
    
    .top-nav h1 {
        font-size: 18px;
    }
    
    .page-content {
        padding: 16px;
    }
    
    .dashboard-cards {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .card {
        padding: 20px;
    }
    
    .card .number {
        font-size: 28px;
    }
    
    .table-container th,
    .table-container td {
        padding: 12px 16px;
        font-size: 13px;
    }
    
    .form-container {
        padding: 24px;
    }
    
    .login-container,
    .view-container,
    .landing-container {
        padding: 32px 24px;
    }
    
    .resource-header {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }
    
    .resource-header .actions {
        width: 100%;
    }
    
    .resource-header .actions .btn {
        flex: 1;
    }
    
    .pagination {
        flex-wrap: wrap;
    }
}

/* ================================================
   Utility Classes - 实用工具类
   ================================================ */
.text-primary { color: var(--primary-color); }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }
.text-muted { color: var(--text-muted); }

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

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.p-1 { padding: 8px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }
.p-4 { padding: 32px; }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.hidden { display: none !important; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Animation Classes */
.animate-fade-in { animation: fadeIn 0.3s ease; }
.animate-slide-up { animation: slideUp 0.4s ease; }
.animate-slide-down { animation: slideDown 0.4s ease; }

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

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

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

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