/* 
 * 现代化视频网站样式表
 * 统一的设计语言和组件样式
 */

/* CSS变量定义 - 主题色系 */
:root {
    /* 主色调 - 现代蓝色系 */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-dark: #1e40af;
    
    /* 辅助色彩 */
    --secondary-color: #64748b;
    --accent-color: #0ea5e9;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    /* 中性色彩 */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* 背景渐变 */
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-gradient-light: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --bg-gradient-blue: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    /* 阴影效果 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 边框半径 */
    --radius-sm: 0.25rem;
    --radius: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* 过渡动画 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 字体 */
    --font-sans: 'Inter', 'Segoe UI', 'Roboto', 'Helvetica Neue', 'Arial', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
}

/* 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 容器和布局 */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
}

.container-sm {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 1rem;
}

.container-lg {
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 头部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow);
    z-index: 1000;
    backdrop-filter: blur(8px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    max-width: 1280px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--gray-900);
    font-weight: 700;
    font-size: 1.5rem;
    transition: var(--transition);
}

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

.logo img {
    height: 2.5rem;
    width: auto;
}

/* 导航菜单 */
.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: var(--gray-100);
}

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

/* 按钮组件 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    user-select: none;
}

.btn:focus {
    outline: 2px solid transparent;
    outline-offset: 2px;
    box-shadow: 0 0 0 2px var(--primary-color);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 按钮变体 */
.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

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

.btn-secondary {
    background-color: var(--gray-200);
    color: var(--gray-800);
}

.btn-secondary:hover {
    background-color: var(--gray-300);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

/* 表单控件 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--gray-700);
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--gray-800);
    background-color: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control::placeholder {
    color: var(--gray-400);
}

.form-control:disabled {
    background-color: var(--gray-100);
    opacity: 0.6;
    cursor: not-allowed;
}

/* 卡片组件 */
.card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

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

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    background-color: var(--gray-50);
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--gray-200);
    background-color: var(--gray-50);
}

/* 表格样式 */
.table-container {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

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

.table th,
.table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background-color: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table tbody tr:hover {
    background-color: var(--gray-50);
}

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

/* 消息提示 */
.alert {
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border-color: rgba(16, 185, 129, 0.2);
}

.alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
    border-color: rgba(245, 158, 11, 0.2);
}

.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border-color: rgba(239, 68, 68, 0.2);
}

.alert-info {
    background-color: rgba(6, 182, 212, 0.1);
    color: var(--info-color);
    border-color: rgba(6, 182, 212, 0.2);
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--gray-300);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

/* 页面加载器 */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(4px);
}

.loader-spinner {
    width: 3rem;
    height: 3rem;
    border: 4px solid var(--gray-300);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        padding: 0.75rem 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-link {
        padding: 0.375rem 0.75rem;
        font-size: 0.875rem;
    }
    
    .container {
        padding: 0 0.75rem;
    }
    
    .table-container {
        overflow-x: auto;
        border-radius: var(--radius);
        box-shadow: var(--shadow);
    }
    
    .table {
        min-width: 600px;
    }
    
    .table th,
    .table td {
        padding: 0.75rem 0.5rem;
        font-size: 0.875rem;
    }
    
    .search-form {
        flex-direction: column;
        gap: 0.75rem;
        width: 100%;
    }
    
    .search-form input,
    .search-form select {
        width: 100%;
        max-width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .video-card {
        padding: 1rem;
    }
    
    .video-card img {
        max-width: 120px;
        max-height: 120px;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 0.625rem 1.25rem;
        font-size: 0.8125rem;
    }
    
    .form-control {
        padding: 0.625rem 0.875rem;
        font-size: 0.8125rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .card-header {
        padding: 1rem;
    }
    
    .header {
        padding: 1rem 0.75rem;
    }
    
    .header h1 {
        font-size: 1.25rem;
    }
    
    .table th,
    .table td {
        padding: 0.5rem 0.375rem;
        font-size: 0.8125rem;
    }
    
    .modal img {
        max-width: 95vw;
        max-height: 85vh;
    }
    
    .action-buttons {
        position: static;
        margin-bottom: 1rem;
        display: flex;
        gap: 0.5rem;
        flex-wrap: wrap;
    }
    
    .action-buttons button {
        flex: 1;
        min-width: 120px;
    }
}

/* 工具类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--gray-600); }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }

.bg-white { background-color: var(--white); }
.bg-gray-50 { background-color: var(--gray-50); }
.bg-gray-100 { background-color: var(--gray-100); }
.bg-primary { background-color: var(--primary-color); }

.rounded { border-radius: var(--radius); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }

.p-0 { padding: 0; }
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }

.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }

/* 响应式表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background: var(--white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.table th,
.table td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background-color: var(--gray-50);
    font-weight: 600;
    color: var(--gray-900);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.table tbody tr:hover {
    background-color: var(--gray-50);
}

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

.table img {
    max-width: 100px;
    max-height: 100px;
    border-radius: var(--radius);
    object-fit: cover;
    cursor: pointer;
    transition: transform var(--transition);
}

.table img:hover {
    transform: scale(1.05);
}

/* 移动端表格优化 */
@media (max-width: 768px) {
    .table-responsive {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        margin: 0 -0.75rem;
        padding: 0 0.75rem;
    }
    
    .table-mobile {
        border-radius: 0;
        box-shadow: none;
    }
    
    .table-mobile th,
    .table-mobile td {
        padding: 0.75rem 0.5rem;
        font-size: 0.8125rem;
    }
    
    .table-mobile img {
        max-width: 80px;
        max-height: 80px;
    }
    
    /* 移动端表格卡片样式 */
    .table-card {
        display: block;
    }
    
    .table-card thead,
    .table-card tbody,
    .table-card th,
    .table-card td,
    .table-card tr {
        display: block;
    }
    
    .table-card thead tr {
        position: absolute;
        top: -9999px;
        left: -9999px;
    }
    
    .table-card tr {
        border: 1px solid var(--gray-200);
        border-radius: var(--radius-md);
        margin-bottom: 1rem;
        padding: 1rem;
        background: var(--white);
        box-shadow: var(--shadow-sm);
    }
    
    .table-card td {
        border: none;
        border-bottom: 1px solid var(--gray-100);
        position: relative;
        padding: 0.75rem 0 0.75rem 35%;
        white-space: normal;
        word-wrap: break-word;
    }
    
    .table-card td:last-child {
        border-bottom: none;
    }
    
    .table-card td:before {
        content: attr(data-label) ": ";
        position: absolute;
        left: 0.75rem;
        width: 30%;
        padding-right: 0.75rem;
        white-space: nowrap;
        font-weight: 600;
        color: var(--gray-700);
        font-size: 0.875rem;
    }
}

/* 移动端表格特殊样式 */
@media (max-width: 480px) {
    .table-mobile th,
    .table-mobile td {
        padding: 0.5rem 0.375rem;
        font-size: 0.75rem;
    }
    
    .table-mobile img {
        max-width: 60px;
        max-height: 60px;
    }
    
    .table-card td {
        padding: 0.5rem 0 0.5rem 40%;
        font-size: 0.8125rem;
    }
    
    .table-card td:before {
        font-size: 0.75rem;
        width: 35%;
    }
}

/* 搜索表单响应式优化 */
.search-form {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.search-form input,
.search-form select {
    flex: 1;
    min-width: 150px;
}

@media (max-width: 768px) {
    .search-form {
        flex-direction: column;
        gap: 0.75rem;
        width: 100%;
    }
    
    .search-form input,
    .search-form select {
        width: 100%;
        max-width: 100%;
        min-width: auto;
    }
}

/* 移动端操作按钮 */
@media (max-width: 768px) {
    .action-buttons {
        position: static !important;
        margin-bottom: 1rem;
        display: flex;
        gap: 0.5rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .action-buttons button {
        flex: 1;
        min-width: 120px;
        font-size: 0.875rem;
        padding: 0.75rem 1rem;
    }
}

/* 模态框响应式 */
.modal {
    padding: 1rem;
}

.modal img {
    max-width: 95vw;
    max-height: 85vh;
    border-radius: var(--radius-lg);
}

@media (max-width: 480px) {
    .modal {
        padding: 0.5rem;
    }
    
    .modal img {
        max-width: 98vw;
        max-height: 80vh;
    }
}

/* 视频网格响应式 */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 1rem 0;
}

.video-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.video-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

@media (max-width: 768px) {
    .video-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .video-card {
        padding: 1rem;
    }
    
    .video-card img {
        max-width: 120px;
        max-height: 120px;
    }
}