/* FOFStudio管理平台 - 简洁商业化设计 */

:root {
    --primary: #1e80ff;
    --primary-hover: #1171ee;
    --primary-deep: #0d5fcc;
    --primary-light: rgba(30, 128, 255, 0.06);
    --primary-lighter: rgba(30, 128, 255, 0.03);
    --primary-border: rgba(30, 128, 255, 0.3);
    
    --accent-orange: #ff7d00;
    --accent-red: #f53f3f;
    --accent-green: #00b42a;
    --accent-purple: #722ed1;
    --accent-cyan: #00b2a9;
    
    --bg: #f4f5f5;
    --bg-card: #ffffff;
    --bg-hover: #f7f8fa;
    --bg-secondary: #f7f8fa;
    --bg-tertiary: #eef0f2;
    
    --border: #e5e6eb;
    --border-light: #f2f3f5;
    --border-medium: #c9cdd4;
    
    --text: #1d2129;
    --text-secondary: #4e5969;
    --text-muted: #86909c;
    --text-inverse: #ffffff;
    
    --success: #00b42a;
    --success-light: rgba(0, 180, 42, 0.08);
    --warning: #ff7d00;
    --warning-light: rgba(255, 125, 0, 0.08);
    --danger: #f53f3f;
    --danger-light: rgba(245, 63, 63, 0.08);
    --info: #1e80ff;
    --info-light: rgba(30, 128, 255, 0.08);
    
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.08);
    
    --radius-xs: 2px;
    --radius-sm: 4px;
    --radius: 6px;
    --radius-md: 8px;
    --radius-lg: 10px;
    
    --transition-fast: all 0.15s ease;
    --transition: all 0.2s ease;
    --transition-slow: all 0.25s ease;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Inter', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: 'tnum';
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: 2px;
}

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

.switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border);
    transition: .3s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    box-shadow: var(--shadow-sm);
}

input:checked+.slider {
    background-color: var(--primary);
}

input:checked+.slider:before {
    transform: translateX(22px);
}

.slider.round {
    border-radius: 26px;
}

.slider.round:before {
    border-radius: 50%;
}

.navbar {
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    height: 60px;
    position: sticky;
    top: 0;
}

.menu-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition-fast);
    display: none;
}

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

.user-menu-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition-fast);
    display: none;
}

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

.navbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    position: relative;
}

.user-dropdown {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.user-dropdown-menu {
    position: absolute;
    top: calc(100% + var(--spacing-sm));
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-sm) 0;
    min-width: 200px;
    z-index: 1000;
    display: none;
}

.user-dropdown-menu.open {
    display: block;
}

.user-dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: 0.875rem;
    border-left: 3px solid transparent;
}

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

.user-info-item {
    font-weight: 600;
    color: var(--text);
    cursor: default;
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    margin-bottom: var(--spacing-xs);
}

.user-info-item:hover {
    background: none;
    color: var(--text);
}

.logout-btn-mobile {
    background: var(--danger-light);
    border: 1px solid var(--danger);
    color: var(--danger);
    width: 90%;
    margin: var(--spacing-sm) auto;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
    text-align: center;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.logout-btn-mobile:hover {
    background: var(--danger);
    color: white;
}

.desktop-only {
    display: block;
}

.navbar-brand {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-brand::before {
    content: '';
    width: 28px;
    height: 28px;
    background: url('../images/AI_code.png') center/contain no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
}

.navbar-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.back-home-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition-fast);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.user-info {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.logout-btn {
    background: var(--danger-light);
    border: 1px solid var(--danger);
    color: var(--danger);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

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

.main-container {
    display: flex;
    flex: 1;
}

.sidebar {
    width: 220px;
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    padding: var(--spacing-md) 0;
    flex-shrink: 0;
    height: calc(100vh - 60px);
    overflow-y: auto;
    position: sticky;
    top: 60px;
    z-index: 99;
    transition: width 0.3s ease;
}

.sidebar-menu {
    list-style: none;
    padding: 0;
}

.sidebar-item {
    margin-bottom: 2px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    padding: 0.65rem 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
}

.sidebar-link:hover {
    background: var(--bg-hover);
    color: var(--text);
}

.sidebar-link.active {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
}

.sidebar-icon {
    margin-right: 0.75rem;
    font-size: 0.95rem;
    width: 18px;
    text-align: center;
}

.sidebar-item.has-submenu {
    position: relative;
}

.sidebar-item.has-submenu .sidebar-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
}

.submenu-arrow {
    transition: transform 0.2s ease;
    font-size: 0.75rem;
    margin-left: auto;
}

.sidebar-item.has-submenu.open .submenu-arrow {
    transform: rotate(180deg);
}

.sidebar-submenu {
    list-style: none;
    padding: 0;
    margin: 2px 0;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.25s ease;
}

.sidebar-item.has-submenu.open .sidebar-submenu {
    max-height: 500px;
}

.sidebar-submenu-item {
    margin: 2px 4px;
}

.sidebar-submenu-link {
    display: flex;
    align-items: center;
    padding: 0.55rem 0.85rem 0.55rem 2.75rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: 0.825rem;
    border-radius: var(--radius-sm);
}

.sidebar-submenu-link:hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.sidebar-submenu-link.active {
    background: var(--primary-lighter);
    color: var(--primary);
    font-weight: 500;
}

.main-content {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
    background: var(--bg);
    height: calc(100vh - 60px);
}

.dashboard-header {
    margin-bottom: var(--spacing-lg);
}

.dashboard-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--spacing-xs);
}

.dashboard-subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    transition: var(--transition);
}

.stat-card:hover {
    box-shadow: var(--shadow-card-hover);
    border-color: var(--primary-border);
}

.stat-icon {
    width: 44px;
    height: 44px;
    background: var(--primary-light);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: var(--primary);
    font-size: 1.1rem;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.features-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.features-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--spacing-lg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-md);
}

.feature-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    transition: var(--transition);
}

.feature-item:hover {
    border-color: var(--primary-border);
    box-shadow: var(--shadow-sm);
}

.feature-icon {
    font-size: 1.35rem;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.55;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1.1rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.92rem;
    background: var(--bg-card);
    color: var(--text);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(30, 128, 255, 0.15);
}

.form-control:hover {
    border-color: var(--border-medium);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.55rem 1.1rem;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    border: none;
    text-decoration: none;
    font-family: inherit;
}

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

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

.btn-primary:disabled {
    background: var(--border);
    color: var(--text-muted);
    cursor: not-allowed;
}

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

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

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

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
}

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

.btn-danger:hover {
    background: #e03636;
}

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

.btn-warning:hover {
    background: #e67100;
}

.mt-4 {
    margin-top: var(--spacing-md);
}

.mt-8 {
    margin-top: var(--spacing-lg);
}

.key-input-group {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.key-input {
    flex-grow: 1;
}

.key-action-btn {
    white-space: nowrap;
    padding: var(--spacing-sm) var(--spacing-md);
}

.key-actions {
    margin-top: var(--spacing-md);
}

.toast {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    z-index: 1000;
    transform: translateX(100%);
    opacity: 0;
    transition: all 0.3s ease;
    border-left: 4px solid var(--primary);
    min-width: 280px;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-success {
    border-left-color: var(--success);
}

.toast-error {
    border-left-color: var(--danger);
}

.toast-info {
    border-left-color: var(--primary);
}

.toast-warning {
    border-left-color: #faad14;
}

.toast-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.toast-success .toast-icon {
    background: var(--success-light);
    color: var(--success);
}

.toast-error .toast-icon {
    background: var(--danger-light);
    color: var(--danger);
}

.toast-info .toast-icon {
    background: rgba(30, 128, 255, 0.12);
    color: var(--primary);
}

.toast-warning .toast-icon {
    background: rgba(250, 173, 20, 0.15);
    color: #faad14;
}

.toast-content {
    flex-grow: 1;
}

.toast-message {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
}

.toast-close {
    background: none;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0;
    line-height: 1;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

.table th,
.table td {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text);
    font-size: 0.825rem;
}

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

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

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.pagination ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: 2px;
}

.page-item {
    display: inline-flex;
    margin: 0;
}

.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 34px;
    padding: 0 var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    background: var(--bg-card);
}

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

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

.page-link.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.dialog-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 0.3s ease;
}

.dialog-overlay.show {
    opacity: 1;
    visibility: visible;
}

.dialog {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(-12px);
    transition: transform 0.3s ease;
}

.dialog-overlay.show .dialog {
    transform: translateY(0);
}

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

.dialog-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.dialog-content {
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.6;
}

.dialog-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-light);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

.dialog-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    border: none;
}

.dialog-btn.cancel {
    background: var(--bg-hover);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.dialog-btn.cancel:hover {
    background: var(--bg-secondary);
}

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

.dialog-btn.confirm:hover {
    background: var(--primary-hover);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-md);
    position: relative;
}

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

.modal-header h3 {
    margin: 0;
    color: var(--text);
    font-size: 1.1rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    width: 28px;
    height: 28px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.modal-close:hover {
    background: var(--danger-light);
    color: var(--danger);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-body .form-group {
    margin-bottom: var(--spacing-lg);
}

.modal-body label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
    font-weight: 500;
    font-size: 0.875rem;
}

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

.modal-footer .btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius);
    font-weight: 500;
    transition: var(--transition-fast);
}

.modal-footer .btn-primary {
    background: var(--primary);
    color: white;
    border: none;
}

.modal-footer .btn-primary:hover {
    background: var(--primary-hover);
}

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

.modal-footer .btn-outline:hover {
    background: var(--bg-hover);
}

.section-header {
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.section-header p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.tabs-container {
    margin-bottom: var(--spacing-lg);
}

.tabs {
    display: flex;
    gap: 3px;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    background: var(--bg-secondary);
    padding: 3px;
    border-radius: var(--radius);
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-fast);
    flex: 1;
    min-width: 90px;
    text-align: center;
}

.tab-btn:hover {
    color: var(--primary);
    background: var(--bg-card);
}

.tab-btn.active {
    background: var(--bg-card);
    color: var(--primary);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.tab-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    display: none;
}

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

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

.content-tabs {
    display: flex;
    gap: 3px;
    margin-top: var(--spacing-sm);
    flex-wrap: wrap;
    background: var(--bg);
    padding: 3px;
    border-radius: var(--radius-sm);
}

.content-tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.825rem;
    font-weight: 500;
    transition: var(--transition-fast);
    flex: 1;
    min-width: 70px;
    text-align: center;
}

.content-tab-btn:hover {
    color: var(--primary);
    background: var(--bg-card);
}

.content-tab-btn.active {
    background: var(--bg-card);
    color: var(--primary);
    font-weight: 600;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.card-header {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.card-header h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-body {
    padding: var(--spacing-lg);
}

.loading-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.875rem;
    gap: var(--spacing-md);
}

.loading-container i {
    font-size: 1rem;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.empty-message {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.875rem;
    background: var(--bg-secondary);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
}

.error-message {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--danger);
    font-size: 0.875rem;
    background: var(--danger-light);
    border: 1px solid var(--danger);
    border-radius: var(--radius);
    margin: var(--spacing-md) 0;
}

.interaction-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.interaction-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: var(--primary);
}

.interaction-item.clickable {
    cursor: pointer;
}

.interaction-item.clickable:hover {
    box-shadow: var(--shadow-card-hover);
    border-color: var(--primary-border);
}

.interaction-header {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.interaction-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    align-items: center;
    font-size: 0.825rem;
}

.interaction-course {
    font-weight: 600;
    color: var(--primary);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.interaction-time {
    color: var(--text-muted);
    font-size: 0.825rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.interaction-user {
    font-weight: 600;
    color: var(--text);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.interaction-content {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.875rem;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border-left: 3px solid var(--primary);
}

.interaction-actions {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius);
    font-size: 0.825rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-fast);
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-secondary);
}

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

.view-btn i {
    font-size: 0.85rem;
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .user-menu-toggle {
        display: block;
    }

    .desktop-only {
        display: none !important;
    }

    .navbar {
        padding: 0 var(--spacing-md);
        flex-direction: row;
        justify-content: space-between;
        gap: var(--spacing-md);
        height: auto;
        min-height: 60px;
    }

    .navbar-left {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        flex: 1;
    }

    .navbar-brand {
        font-size: 0.95rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .sidebar {
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        height: auto;
        max-height: calc(100vh - 60px);
        background: var(--bg-card);
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: var(--spacing-md) 0;
        z-index: 9999;
        display: none;
        margin: 0;
    }

    .sidebar.open {
        display: block;
    }

    .sidebar-menu {
        display: block;
        overflow-x: visible;
    }

    .sidebar-item {
        margin-bottom: 2px;
        margin-right: 0;
    }

    .sidebar-link {
        white-space: normal;
    }

    .main-container {
        flex-direction: column;
    }

    .main-content {
        padding: var(--spacing-md);
        height: calc(100vh - 60px);
    }

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

    .features-grid {
        grid-template-columns: 1fr;
    }

    .features-section .grid {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-md) !important;
    }

    .features-section>div:not(.grid) {
        display: grid !important;
        grid-template-columns: 1fr !important;
        gap: var(--spacing-md) !important;
    }

    #bytesChart,
    #costChart {
        height: 300px !important;
    }

    .form-group>div {
        flex-direction: column !important;
        gap: var(--spacing-md) !important;
        align-items: stretch !important;
    }

    .form-group>div>div {
        flex-direction: column !important;
        gap: var(--spacing-sm) !important;
        align-items: stretch !important;
    }

    .form-group input[type="date"] {
        width: 100% !important;
        margin: 0 !important;
    }

    .form-group>div>button {
        width: 100% !important;
        margin: 0 !important;
    }

    .features-section .table-responsive {
        overflow-x: auto;
    }

    .features-section table {
        width: 100%;
        border-collapse: separate;
        border-spacing: 0;
    }

    .features-section table tbody {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .features-section table tr {
        display: flex;
        flex-direction: column;
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        overflow: hidden;
        padding: var(--spacing-md);
    }

    .features-section table td {
        border: none;
        padding: var(--spacing-sm) 0;
        display: flex;
        justify-content: space-between;
        align-items: center;
        border-bottom: 1px solid var(--border-light);
    }

    .features-section table td:last-child {
        border-bottom: none;
    }

    .features-section table td:before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--text-muted);
    }

    .features-section table thead {
        display: none;
    }

    .dialog {
        width: 95%;
        margin: var(--spacing-md);
    }
}