/* ================================================
   ECH Admin Dashboard - Sidebar Layout
   ================================================ */

:root {
    --admin-sidebar-width: 260px;
    --admin-sidebar-collapsed: 72px;
    --admin-topbar-height: 64px;
    --admin-bg: #f1f5f9;
    --admin-sidebar-bg: #1e293b;
    --admin-sidebar-text: #94a3b8;
    --admin-sidebar-text-hover: #ffffff;
    --admin-sidebar-active-bg: rgba(99, 102, 241, 0.15);
    --admin-sidebar-active-text: #818cf8;
    --admin-topbar-bg: #ffffff;
    --admin-topbar-border: #e2e8f0;
    --admin-card-bg: #ffffff;
    --admin-text: #1e293b;
    --admin-text-muted: #64748b;
    --admin-border: #e2e8f0;
    --admin-primary: #6366f1;
    --admin-primary-light: rgba(99, 102, 241, 0.1);
    --admin-success: #22c55e;
    --admin-warning: #f59e0b;
    --admin-danger: #ef4444;
    --admin-cyan: #06b6d4;
    --admin-radius: 12px;
    --admin-radius-sm: 8px;
    --admin-shadow: 0 1px 3px rgba(0,0,0,0.08);
    --admin-shadow-lg: 0 4px 20px rgba(0,0,0,0.1);
    --admin-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark mode */
.dark-mode {
    --admin-bg: #0f172a;
    --admin-topbar-bg: #1e293b;
    --admin-topbar-border: #334155;
    --admin-card-bg: #1e293b;
    --admin-text: #e2e8f0;
    --admin-text-muted: #94a3b8;
    --admin-border: #334155;
    --admin-shadow: 0 1px 3px rgba(0,0,0,0.3);
    --admin-shadow-lg: 0 4px 20px rgba(0,0,0,0.4);
}

/* ==================== Base & Font ==================== */
.admin-body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--admin-bg);
    color: var(--admin-text);
    min-height: 100vh;
    overflow-x: hidden;
    margin: 0;
}

/* ==================== Sidebar ==================== */
.admin-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--admin-sidebar-width);
    height: 100vh;
    background: var(--admin-sidebar-bg);
    display: flex;
    flex-direction: column;
    z-index: 1040;
    transition: width var(--admin-transition);
    overflow: hidden;
}

.admin-sidebar.collapsed {
    width: var(--admin-sidebar-collapsed);
}

/* Sidebar Header */
.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 16px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    min-height: 64px;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-logo-img {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    flex-shrink: 0;
    object-fit: cover;
}

.collapsed .sidebar-logo-text {
    display: none;
}

.sidebar-toggle {
    background: rgba(255,255,255,0.08);
    border: none;
    color: #94a3b8;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.sidebar-toggle:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

.collapsed .sidebar-toggle i {
    transform: rotate(180deg);
}

/* Sidebar Navigation */
.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 12px 0;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
}

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

.sidebar-item {
    margin: 2px 8px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    color: var(--admin-sidebar-text);
    text-decoration: none;
    border-radius: var(--admin-radius-sm);
    transition: all 0.2s;
    white-space: nowrap;
    font-size: 0.875rem;
    font-weight: 500;
}

.sidebar-link:hover {
    color: var(--admin-sidebar-text-hover);
    background: rgba(255,255,255,0.06);
}

.sidebar-link i {
    font-size: 1.15rem;
    width: 22px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-item.active .sidebar-link {
    color: var(--admin-sidebar-active-text);
    background: var(--admin-sidebar-active-bg);
}

.collapsed .sidebar-link span {
    display: none;
}

/* Sidebar divider */
.sidebar-divider {
    height: 1px;
    background: rgba(255,255,255,0.06);
    margin: 8px 16px;
}

.sidebar-section-title {
    padding: 8px 20px 4px;
    color: rgba(148,163,184,0.6);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.collapsed .sidebar-section-title span {
    display: none;
}

/* Sidebar Footer */
.sidebar-footer {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 8px;
}

.sidebar-link-btn {
    width: 100%;
    border: none;
    background: none;
    text-align: left;
    cursor: pointer;
    font-family: inherit;
}

/* ==================== Main Area ==================== */
.admin-main {
    margin-left: var(--admin-sidebar-width);
    min-height: 100vh;
    transition: margin-left var(--admin-transition);
}

.admin-main.expanded {
    margin-left: var(--admin-sidebar-collapsed);
}

/* ==================== Top Bar ==================== */
.admin-topbar {
    position: sticky;
    top: 0;
    z-index: 1020;
    height: var(--admin-topbar-height);
    background: var(--admin-topbar-bg);
    border-bottom: 1px solid var(--admin-topbar-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    box-shadow: var(--admin-shadow);
}

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

.topbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.topbar-menu-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--admin-text);
    cursor: pointer;
    padding: 4px;
}

.topbar-search {
    position: relative;
    display: flex;
    align-items: center;
}

.topbar-search i {
    position: absolute;
    left: 12px;
    color: var(--admin-text-muted);
    font-size: 0.9rem;
}

.topbar-search-input {
    background: var(--admin-bg);
    border: 1px solid var(--admin-border);
    border-radius: 8px;
    padding: 8px 12px 8px 36px;
    font-size: 0.875rem;
    color: var(--admin-text);
    width: 280px;
    transition: all 0.2s;
    font-family: inherit;
}

.topbar-search-input:focus {
    outline: none;
    border-color: var(--admin-primary);
    box-shadow: 0 0 0 3px var(--admin-primary-light);
}

.topbar-action-btn {
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.8rem;
    padding: 6px 14px;
}

.topbar-icon-btn {
    background: var(--admin-bg);
    border: 1px solid var(--admin-border);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--admin-text-muted);
    transition: all 0.2s;
}

.topbar-icon-btn:hover {
    color: var(--admin-text);
    border-color: var(--admin-primary);
}

.topbar-user-btn {
    background: none;
    border: none;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 8px;
    transition: background 0.2s;
    color: var(--admin-text);
}

.topbar-user-btn:hover {
    background: var(--admin-bg);
}

.topbar-user-btn::after {
    display: none; /* Hide default dropdown caret */
}

.topbar-avatar {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    object-fit: cover;
}

.topbar-username {
    font-weight: 500;
    font-size: 0.875rem;
}

/* ==================== Content Area ==================== */
.admin-content {
    padding: 24px;
    min-height: calc(100vh - var(--admin-topbar-height));
}

/* ==================== Common Admin Components ==================== */

/* Cards */
.admin-card {
    background: var(--admin-card-bg);
    border-radius: var(--admin-radius);
    border: 1px solid var(--admin-border);
    box-shadow: var(--admin-shadow);
}

.admin-card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--admin-border);
    font-weight: 600;
    font-size: 0.95rem;
}

.admin-card-body {
    padding: 20px;
}

/* Stat Cards */
.stat-card {
    background: var(--admin-card-bg);
    border-radius: var(--admin-radius);
    padding: 20px;
    border: 1px solid var(--admin-border);
    box-shadow: var(--admin-shadow);
    transition: all 0.3s ease;
}

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

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--admin-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
}

.stat-card .stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat-card .stat-label {
    font-size: 0.8rem;
    color: var(--admin-text-muted);
    font-weight: 500;
}

/* Tables */
.admin-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.875rem;
}

.admin-table th {
    background: var(--admin-bg);
    color: var(--admin-text-muted);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--admin-border);
}

.admin-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--admin-border);
    vertical-align: middle;
}

.admin-table tbody tr:hover {
    background: var(--admin-primary-light);
}

.admin-table tbody tr:nth-child(even) {
    background: rgba(0,0,0,0.01);
}

.dark-mode .admin-table tbody tr:nth-child(even) {
    background: rgba(255,255,255,0.02);
}

/* ==================== Mobile Overlay ==================== */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1035;
    backdrop-filter: blur(2px);
}

.sidebar-overlay.show {
    display: block;
}

/* ==================== Responsive ==================== */
@media (max-width: 1199.98px) {
    .admin-sidebar {
        transform: translateX(-100%);
        width: var(--admin-sidebar-width) !important;
    }

    .admin-sidebar.mobile-open {
        transform: translateX(0);
    }

    .admin-main {
        margin-left: 0 !important;
    }
}

@media (max-width: 767.98px) {
    .admin-content {
        padding: 16px;
    }

    .admin-topbar {
        padding: 0 16px;
    }
}

/* ==================== Animations ==================== */
@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--admin-success);
    display: inline-block;
    animation: pulse-dot 1.5s ease-in-out infinite;
}

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

.spin {
    animation: spin 1s linear infinite;
}

/* ==================== Utility: hover-lift ==================== */
.hover-lift {
    transition: all 0.3s ease;
}
.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--admin-shadow-lg) !important;
}

/* ==================== Admin Page Header ==================== */
.admin-page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.admin-page-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2px;
    color: var(--admin-text);
}

.admin-page-header .page-subtitle {
    font-size: 0.875rem;
    color: var(--admin-text-muted);
    margin: 0;
}

/* ==================== Admin Filter Card ==================== */
.admin-filter-card {
    background: var(--admin-card-bg);
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius);
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: var(--admin-shadow);
}

/* ==================== Admin Empty State ==================== */
.admin-empty-state {
    text-align: center;
    padding: 48px 20px;
    color: var(--admin-text-muted);
}

.admin-empty-state i {
    font-size: 4rem;
    opacity: 0.4;
    margin-bottom: 16px;
    display: block;
}

.admin-empty-state h4 {
    color: var(--admin-text);
    margin-bottom: 8px;
    font-weight: 600;
}

.admin-empty-state p {
    color: var(--admin-text-muted);
    margin-bottom: 20px;
}

/* ==================== Admin Badge Status ==================== */
.admin-badge {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.admin-badge i {
    font-size: 0.65rem;
}

.admin-badge-success {
    background: rgba(34, 197, 94, 0.1);
    color: #16a34a;
}

.admin-badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: #d97706;
}

.admin-badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
}

.admin-badge-info {
    background: rgba(6, 182, 212, 0.1);
    color: #0891b2;
}

.admin-badge-secondary {
    background: rgba(100, 116, 139, 0.1);
    color: #64748b;
}

.dark-mode .admin-badge-success {
    background: rgba(34, 197, 94, 0.15);
    color: #4ade80;
}

.dark-mode .admin-badge-warning {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
}

.dark-mode .admin-badge-danger {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
}

.dark-mode .admin-badge-info {
    background: rgba(6, 182, 212, 0.15);
    color: #22d3ee;
}

.dark-mode .admin-badge-secondary {
    background: rgba(100, 116, 139, 0.15);
    color: #94a3b8;
}

/* ==================== Dark Mode: Bootstrap Overrides ==================== */

/* Cards */
.dark-mode .card {
    background: var(--admin-card-bg);
    border-color: var(--admin-border);
    color: var(--admin-text);
}

.dark-mode .card-header {
    background: var(--admin-card-bg);
    border-color: var(--admin-border);
    color: var(--admin-text);
}

.dark-mode .card-header.bg-white {
    background: var(--admin-card-bg) !important;
}

/* Tables */
.dark-mode .table {
    color: var(--admin-text);
    border-color: var(--admin-border);
}

.dark-mode .table > :not(caption) > * > * {
    background-color: transparent;
    border-color: var(--admin-border);
    color: var(--admin-text);
}

.dark-mode .table-light {
    --bs-table-bg: rgba(255, 255, 255, 0.03);
    --bs-table-border-color: var(--admin-border);
    color: var(--admin-text-muted);
}

.dark-mode .table-light th {
    background: rgba(255, 255, 255, 0.03);
    color: var(--admin-text-muted);
    border-color: var(--admin-border);
}

.dark-mode .table-hover > tbody > tr:hover > * {
    background-color: var(--admin-primary-light);
    color: var(--admin-text);
}

/* Forms */
.dark-mode .form-control,
.dark-mode .form-select {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--admin-border);
    color: var(--admin-text);
}

.dark-mode .form-control:focus,
.dark-mode .form-select:focus {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: var(--admin-primary);
    color: var(--admin-text);
    box-shadow: 0 0 0 3px var(--admin-primary-light);
}

.dark-mode .form-control::placeholder {
    color: var(--admin-text-muted);
}

.dark-mode .form-label {
    color: var(--admin-text);
}

.dark-mode .form-check-label {
    color: var(--admin-text);
}

.dark-mode .input-group-text {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--admin-border);
    color: var(--admin-text-muted);
}

/* Modals */
.dark-mode .modal-content {
    background: var(--admin-card-bg);
    border-color: var(--admin-border);
    color: var(--admin-text);
}

.dark-mode .modal-header {
    border-color: var(--admin-border);
}

.dark-mode .modal-footer {
    border-color: var(--admin-border);
}

.dark-mode .btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}

/* Alerts */
.dark-mode .alert-success {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.2);
    color: #4ade80;
}

.dark-mode .alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.2);
    color: #f87171;
}

.dark-mode .alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.2);
    color: #fbbf24;
}

.dark-mode .alert-info {
    background: rgba(6, 182, 212, 0.1);
    border-color: rgba(6, 182, 212, 0.2);
    color: #22d3ee;
}

/* Pagination */
.dark-mode .page-link {
    background-color: var(--admin-card-bg);
    border-color: var(--admin-border);
    color: var(--admin-text);
}

.dark-mode .page-link:hover {
    background-color: var(--admin-primary-light);
    border-color: var(--admin-primary);
    color: var(--admin-primary);
}

.dark-mode .page-item.disabled .page-link {
    background-color: rgba(255, 255, 255, 0.03);
    border-color: var(--admin-border);
    color: var(--admin-text-muted);
}

.dark-mode .page-item.active .page-link {
    background-color: var(--admin-primary);
    border-color: var(--admin-primary);
}

/* Nav Tabs */
.dark-mode .nav-tabs {
    border-color: var(--admin-border);
}

.dark-mode .nav-tabs .nav-link {
    color: var(--admin-text-muted);
}

.dark-mode .nav-tabs .nav-link:hover {
    border-color: var(--admin-border);
    color: var(--admin-text);
}

.dark-mode .nav-tabs .nav-link.active {
    background: var(--admin-card-bg);
    border-color: var(--admin-border) var(--admin-border) var(--admin-card-bg);
    color: var(--admin-primary);
}

/* Buttons */
.dark-mode .btn-light {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--admin-border);
    color: var(--admin-text);
}

.dark-mode .btn-light:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--admin-text);
}

.dark-mode .btn-outline-secondary {
    border-color: var(--admin-border);
    color: var(--admin-text-muted);
}

.dark-mode .btn-outline-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--admin-text);
}

/* Badges */
.dark-mode .badge.bg-success {
    background: rgba(34, 197, 94, 0.15) !important;
    color: #4ade80;
}

.dark-mode .badge.bg-danger {
    background: rgba(239, 68, 68, 0.15) !important;
    color: #f87171;
}

.dark-mode .badge.bg-warning {
    background: rgba(245, 158, 11, 0.15) !important;
    color: #fbbf24;
}

.dark-mode .badge.bg-info {
    background: rgba(6, 182, 212, 0.15) !important;
    color: #22d3ee;
}

.dark-mode .badge.bg-secondary {
    background: rgba(100, 116, 139, 0.15) !important;
    color: #94a3b8;
}

.dark-mode .badge.bg-primary {
    background: rgba(99, 102, 241, 0.15) !important;
    color: #818cf8;
}

/* Dropdowns */
.dark-mode .dropdown-menu {
    background: var(--admin-card-bg);
    border-color: var(--admin-border);
}

.dark-mode .dropdown-item {
    color: var(--admin-text);
}

.dark-mode .dropdown-item:hover {
    background: var(--admin-primary-light);
    color: var(--admin-text);
}

.dark-mode .dropdown-divider {
    border-color: var(--admin-border);
}

/* Text Utilities */
.dark-mode .text-dark {
    color: var(--admin-text) !important;
}

.dark-mode .text-muted {
    color: var(--admin-text-muted) !important;
}

.dark-mode .bg-light {
    background-color: rgba(255, 255, 255, 0.03) !important;
}

.dark-mode .bg-white {
    background-color: var(--admin-card-bg) !important;
}

.dark-mode .border {
    border-color: var(--admin-border) !important;
}

.dark-mode .border-bottom {
    border-color: var(--admin-border) !important;
}

.dark-mode .shadow-sm {
    box-shadow: var(--admin-shadow) !important;
}

/* Images */
.dark-mode .img-thumbnail {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--admin-border);
}

/* Code */
.dark-mode code {
    color: #c084fc;
    background: rgba(192, 132, 252, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
}

/* Custom Toast (dark mode) */
.dark-mode .custom-toast {
    background: var(--admin-card-bg);
    border-color: var(--admin-border);
    color: var(--admin-text);
}

/* ==================== Admin Mini Stats ==================== */
.admin-stat-mini {
    background: var(--admin-card-bg);
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius);
    padding: 16px 20px;
    box-shadow: var(--admin-shadow);
}

.admin-stat-mini h6 {
    color: var(--admin-text-muted);
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 4px;
}

.admin-stat-mini h3 {
    font-weight: 700;
    margin: 0;
    font-size: 1.5rem;
}

/* ==================== Admin Action Buttons ==================== */
.admin-btn-group .btn {
    padding: 6px 10px;
    font-size: 0.8rem;
    border-radius: 6px;
}

.admin-btn-group .btn + .btn {
    margin-left: 4px;
}

/* ==================== Custom Toast ==================== */
.custom-toast {
    position: fixed;
    top: 80px;
    right: 24px;
    z-index: 9999;
    min-width: 300px;
    max-width: 420px;
    padding: 14px 20px;
    border-radius: var(--admin-radius-sm);
    box-shadow: var(--admin-shadow-lg);
    background: var(--admin-card-bg);
    border: 1px solid var(--admin-border);
    transform: translateX(120%);
    transition: transform 0.3s ease;
}

.custom-toast.show {
    transform: translateX(0);
}

.custom-toast-success {
    border-left: 4px solid var(--admin-success);
}

.custom-toast-error {
    border-left: 4px solid var(--admin-danger);
}

.custom-toast-content {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.875rem;
    color: var(--admin-text);
}