/* ============================================================
   AVDAPP - Design System (Tencent Cloud Style)
   高端科技风设计系统
   ============================================================ */

/* ====== CSS Reset & Variables ====== */
:root {
    /* Brand Colors */
    --primary: #0052D9;
    --primary-hover: #2670E5;
    --primary-light: #E0EFFF;
    --primary-dark: #003FA4;
    --accent: #00A4FF;
    --accent-glow: rgba(0, 164, 255, 0.3);

    /* Status Colors */
    --success: #00A870;
    --success-bg: #E6F7EF;
    --warning: #ED9F40;
    --warning-bg: #FFF3E0;
    --danger: #E34D59;
    --danger-bg: #FDE8EA;
    --info: #0052D9;
    --info-bg: #E0EFFF;
    --default: #909399;
    --default-bg: #F0F2F5;

    /* Neutral / Background */
    --bg-page: #F0F2F5;
    --bg-card: #FFFFFF;
    --bg-sidebar: #00162D;
    --bg-sidebar-hover: rgba(255, 255, 255, 0.08);
    --bg-sidebar-active: linear-gradient(90deg, rgba(0, 82, 217, 0.15) 0%, transparent 100%);
    --bg-header: rgba(255, 255, 255, 0.85);
    --bg-overlay: rgba(0, 0, 0, 0.45);

    /* Text */
    --text-primary: #1D2129;
    --text-regular: #4E5969;
    --text-secondary: #86909C;
    --text-placeholder: #C9CDD4;
    --text-on-dark: #FFFFFF;
    --text-on-dark-secondary: #8A9BB0;

    /* Border */
    --border-color: #E5E6EB;
    --border-light: #F0F2F5;
    --border-dark: #2A3F5F;

    /* Shadow */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 24px rgba(0, 82, 217, 0.15);

    /* Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-xl: 16px;

    /* Spacing */
    --sidebar-width: 240px;
    --header-height: 56px;
    --content-max-width: 1400px;

    /* Transitions */
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
                 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-page);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-hover); }

ul, ol { list-style: none; }

/* ====== Layout ====== */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    color: var(--text-on-dark);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: var(--transition);
    overflow: hidden;
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 20px;
    border-bottom: 1px solid var(--border-dark);
    flex-shrink: 0;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-on-dark);
}

.sidebar-logo .logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: white;
    font-weight: 700;
    box-shadow: 0 0 16px var(--accent-glow);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 12px 0;
}

.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-track { background: transparent; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 2px; }

.nav-group { margin-bottom: 8px; }

.nav-group-title {
    padding: 8px 20px;
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-on-dark-secondary);
    letter-spacing: 1px;
    font-weight: 500;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    color: var(--text-on-dark-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    position: relative;
    user-select: none;
}

.nav-item:hover {
    background: var(--bg-sidebar-hover);
    color: var(--text-on-dark);
}

.nav-item.active {
    background: var(--bg-sidebar-active);
    color: var(--text-on-dark);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent);
    border-radius: 0 2px 2px 0;
}

.nav-item .nav-icon {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.nav-item .nav-badge {
    margin-left: auto;
    background: var(--danger);
    color: white;
    font-size: 10px;
    padding: 1px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

/* Main */
.main-container {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: var(--transition);
}

/* Header */
.app-header {
    height: var(--header-height);
    background: var(--bg-header);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 50;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.header-breadcrumb .breadcrumb-current {
    color: var(--text-primary);
    font-weight: 500;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-search {
    position: relative;
    width: 240px;
}

.header-search input {
    width: 100%;
    height: 32px;
    padding: 0 12px 0 36px;
    background: var(--bg-page);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text-primary);
    transition: var(--transition);
    outline: none;
}

.header-search input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.header-search .search-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-placeholder);
}

.header-action {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.header-action:hover {
    background: var(--bg-page);
    color: var(--text-primary);
}

.header-action .badge-dot {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 8px;
    height: 8px;
    background: var(--danger);
    border-radius: 50%;
    border: 2px solid white;
}

.user-dropdown {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 8px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.user-dropdown:hover { background: var(--bg-page); }

.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

.user-name { font-size: 13px; color: var(--text-primary); font-weight: 500; }

/* Content */
.app-content {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 16px;
}

.page-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.page-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.page-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

/* ====== Card ====== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: var(--transition);
}

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

.card-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body { padding: 24px; }

.card-glow {
    position: relative;
    overflow: hidden;
}

.card-glow::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
}

/* ====== Stat Cards ====== */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 20px;
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

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

.stat-card .stat-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 12px;
}

.stat-card .stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-card .stat-trend {
    font-size: 12px;
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.stat-trend.up { color: var(--success); }
.stat-trend.down { color: var(--danger); }

/* ====== Table ====== */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

thead {
    background: var(--bg-page);
}

th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
}

tbody tr {
    transition: var(--transition);
}

tbody tr:hover {
    background: var(--bg-page);
}

.table-row-actions {
    display: flex;
    gap: 4px;
}

/* ====== Button ====== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    color: var(--text-regular);
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
    outline: none;
    white-space: nowrap;
    font-family: inherit;
    line-height: 1.4;
}

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

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

.btn-primary:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    color: white;
    box-shadow: var(--shadow-glow);
}

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

.btn-success:hover { background: #00C078; border-color: #00C078; color: white; }

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

.btn-danger:hover { background: #F05A5A; border-color: #F05A5A; color: white; }

.btn-ghost {
    background: transparent;
    border-color: transparent;
    padding: 6px 8px;
}

.btn-ghost:hover {
    background: var(--bg-page);
    border-color: transparent;
}

.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-lg { padding: 10px 24px; font-size: 14px; }
.btn-icon { padding: 7px; width: 32px; height: 32px; justify-content: center; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ====== Tag / Badge ====== */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 400;
    line-height: 1.6;
    white-space: nowrap;
}

.tag-primary { background: var(--info-bg); color: var(--info); }
.tag-success { background: var(--success-bg); color: var(--success); }
.tag-warning { background: var(--warning-bg); color: var(--warning); }
.tag-danger { background: var(--danger-bg); color: var(--danger); }
.tag-default { background: var(--default-bg); color: var(--default); }

/* ====== Form ====== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 13px;
    color: var(--text-regular);
    margin-bottom: 6px;
    font-weight: 500;
}

.form-label.required::after {
    content: ' *';
    color: var(--danger);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    height: 34px;
    padding: 0 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text-primary);
    background: var(--bg-card);
    transition: var(--transition);
    outline: none;
    font-family: inherit;
}

.form-textarea {
    height: auto;
    padding: 8px 12px;
    min-height: 80px;
    resize: vertical;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

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

.form-row {
    display: flex;
    gap: 16px;
}

.form-row > .form-group { flex: 1; }

/* ====== Modal ====== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s;
}

.modal {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 560px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.25s;
}

.modal-large { max-width: 800px; }
.modal-small { max-width: 400px; }

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.modal-body {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-light);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* ====== Pagination ====== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4px;
    padding: 16px 0;
}

.page-btn {
    min-width: 32px;
    height: 32px;
    padding: 0 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-regular);
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
}

.page-btn:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
}

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

.page-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ====== Upload ====== */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-page);
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.upload-icon {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 16px;
}

.upload-text {
    font-size: 14px;
    color: var(--text-regular);
    margin-bottom: 8px;
}

.upload-hint {
    font-size: 12px;
    color: var(--text-secondary);
}

/* ====== Empty State ====== */
.empty-state {
    text-align: center;
    padding: 48px 24px;
}

.empty-icon {
    font-size: 64px;
    color: var(--text-placeholder);
    margin-bottom: 16px;
}

.empty-text {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ====== Loading ====== */
.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.loading-page {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px;
}

/* ====== Tree ====== */
.tree-container {
    user-select: none;
}

.tree-node {
    margin-left: 0;
}

.tree-node-content {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.tree-node-content:hover {
    background: var(--bg-page);
}

.tree-node-content.selected {
    background: var(--primary-light);
}

.tree-toggle {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    flex-shrink: 0;
    transition: var(--transition);
}

.tree-toggle.expanded { transform: rotate(90deg); }

.tree-children {
    margin-left: 16px;
    border-left: 1px dashed var(--border-color);
    padding-left: 8px;
}

.tree-level-badge {
    font-size: 10px;
    padding: 1px 6px;
    border-radius: 4px;
    background: var(--bg-page);
    color: var(--text-secondary);
    flex-shrink: 0;
}

/* ====== Progress Bar ====== */
.progress {
    height: 6px;
    background: var(--bg-page);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 3px;
    transition: width 0.3s;
}

.progress-bar.success { background: var(--success); }
.progress-bar.warning { background: var(--warning); }
.progress-bar.danger { background: var(--danger); }

/* ====== Login ====== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #00162D 0%, #002950 50%, #003FA4 100%);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,164,255,0.15) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    border-radius: 50%;
}

.login-page::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0,82,217,0.1) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
    border-radius: 50%;
}

.login-card {
    width: 400px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.login-logo {
    text-align: center;
    margin-bottom: 32px;
}

.login-logo .logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: var(--radius-lg);
    font-size: 24px;
    color: white;
    font-weight: 700;
    box-shadow: 0 0 32px var(--accent-glow);
    margin-bottom: 16px;
}

.login-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.login-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
}

.login-form .form-input {
    height: 42px;
    font-size: 14px;
}

.login-btn {
    width: 100%;
    height: 42px;
    font-size: 14px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border: none;
    color: white;
    font-weight: 600;
    box-shadow: 0 4px 16px rgba(0, 82, 217, 0.3);
}

.login-btn:hover {
    box-shadow: 0 6px 24px rgba(0, 82, 217, 0.4);
    transform: translateY(-1px);
}

/* ====== Tabs ====== */
.tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.tab-item {
    padding: 10px 20px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: var(--transition);
    white-space: nowrap;
}

.tab-item:hover { color: var(--text-primary); }
.tab-item.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    font-weight: 500;
}

/* ====== Media Grid ====== */
/* Folder navigation */
.folder-crumb {
    font-size: 13px;
    color: var(--primary);
    cursor: pointer;
    padding: 2px 8px;
    border-radius: 4px;
    transition: background 0.2s;
}
.folder-crumb:hover {
    background: var(--primary-light);
}
.folder-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 120px;
    height: 100px;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    padding: 12px;
    gap: 4px;
}
.folder-item:hover {
    border-color: var(--primary-light);
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.folder-item .folder-name {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-primary);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
}
.folder-item .folder-code {
    font-size: 10px;
    color: var(--text-tertiary);
}

.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.media-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-light);
    cursor: pointer;
    transition: var(--transition);
}

.media-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.media-thumb {
    width: 100%;
    height: 140px;
    background: var(--bg-page);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

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

.media-thumb .media-type-icon {
    font-size: 36px;
    color: var(--text-placeholder);
}

.media-thumb .media-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    font-size: 11px;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.media-thumb .media-status {
    position: absolute;
    top: 8px;
    left: 8px;
}

.media-info {
    padding: 12px;
}

.media-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.media-meta {
    font-size: 11px;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
}

/* ====== Status Dot ====== */
.status-dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-right: 6px;
}

.status-dot.success { background: var(--success); }
.status-dot.warning { background: var(--warning); }
.status-dot.danger { background: var(--danger); }
.status-dot.default { background: var(--default); }
.status-dot.info { background: var(--primary); }

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

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

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

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

.fade-enter-active, .fade-leave-active {
    transition: opacity 0.2s;
}
.fade-enter-from, .fade-leave-to {
    opacity: 0;
}

.slide-enter-active, .slide-leave-active {
    transition: all 0.25s;
}
.slide-enter-from, .slide-leave-to {
    opacity: 0;
    transform: translateX(20px);
}

/* ====== Scrollbar ====== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-placeholder); }

/* ====== Tooltip ====== */
[data-tooltip] {
    position: relative;
}

[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    white-space: nowrap;
    margin-bottom: 4px;
    z-index: 999;
}

/* ====== Responsive ====== */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 0px;
    }
    .sidebar { transform: translateX(-100%); }
    .sidebar.show { transform: translateX(0); width: 240px; }
    .main-container { margin-left: 0; }
    .stat-grid { grid-template-columns: 1fr; }
    .form-row { flex-direction: column; }
}