:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --sidebar-bg: #0f172a;
    --sidebar-hover: #1e293b;
    --sidebar-active: #2563eb;
    --card-bg: #ffffff;
    --body-bg: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--body-bg);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Login Page */
.login-page {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 400px;
}

.login-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 32px 24px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.login-header {
    text-align: center;
    margin-bottom: 24px;
}

.login-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
}

.logo-icon {
    font-size: 28px;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--sidebar-bg);
}

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

.login-header h1 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 4px;
}

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

.login-form .form-group {
    margin-bottom: 16px;
}

.login-form label {
    display: block;
    font-weight: 600;
    font-size: 13px;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.input-icon {
    position: relative;
}

.input-icon i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 14px;
}

.input-icon input {
    width: 100%;
    padding: 12px 12px 12px 40px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.input-icon input:focus {
    outline: none;
    border-color: var(--primary);
}

.login-footer {
    text-align: center;
    margin-top: 16px;
}

.login-footer a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
}

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

/* Alert */
.alert {
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 16px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.alert-error {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.alert-success {
    background: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    color: #fff;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 1000;
    transition: transform 0.3s;
}

.sidebar-header {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    flex-shrink: 0;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: #fff;
}

.sidebar-logo .logo-icon {
    font-size: 22px;
}

.sidebar-logo .logo-text {
    font-size: 16px;
    font-weight: 700;
}

.sidebar-logo .logo-text span {
    color: var(--primary-light);
}

.sidebar-close {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    padding: 4px;
}

.sidebar-nav {
    flex: 1;
    padding: 12px 10px;
    overflow-y: auto;
    min-height: 0;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    border-radius: 8px;
    margin-bottom: 2px;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s;
}

.sidebar-link:hover {
    background: var(--sidebar-hover);
    color: #fff;
}

.sidebar-link.active {
    background: var(--sidebar-active);
    color: #fff;
}

.sidebar-link i {
    width: 18px;
    text-align: center;
    font-size: 14px;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    margin-left: auto;
}

.badge-red { background: #fef2f2; color: #dc2626; }
.badge-green { background: #f0fdf4; color: #16a34a; }
.badge-blue { background: #eff6ff; color: #2563eb; }
.badge-yellow { background: #fefce8; color: #ca8a04; }
.badge-gray { background: #f8fafc; color: #64748b; }

.sidebar-footer {
    padding: 10px;
    border-top: 1px solid rgba(255,255,255,0.1);
    flex-shrink: 0;
    background: var(--sidebar-bg);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    min-height: 100vh;
}

.topbar {
    background: var(--card-bg);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px;
}

.topbar-right {
    margin-left: auto;
}

.admin-name {
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.content-wrapper {
    padding: 20px;
}

/* Page Header */
.page-header {
    margin-bottom: 20px;
}

.page-header h1 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 2px;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 13px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.stat-icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.stat-info h3 {
    font-size: 20px;
    font-weight: 700;
}

.stat-info p {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    margin-bottom: 16px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
}

.card-header h2 {
    font-size: 14px;
    font-weight: 600;
}

.card-body {
    padding: 16px;
}

/* Grid */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* Table */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 -16px;
    padding: 0 16px;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    min-width: 600px;
}

.table th {
    text-align: left;
    padding: 10px 12px;
    font-weight: 600;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

.table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.table tr:hover {
    background: #f8fafc;
}

.table tr.row-new {
    background: #eff6ff;
}

.table-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.avatar-placeholder {
    font-size: 20px;
}

.actions {
    white-space: nowrap;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s;
    margin-right: 2px;
}

.btn-icon:hover {
    background: #f1f5f9;
    color: var(--primary);
}

.btn-icon-red:hover {
    background: #fef2f2;
    color: var(--danger);
}

.btn-icon-green:hover {
    background: #f0fdf4;
    color: var(--success);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    background: var(--card-bg);
    color: var(--text-primary);
    white-space: nowrap;
}

.btn:hover {
    background: #f8fafc;
}

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

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

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* Forms */
.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 13px;
    margin-bottom: 5px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 9px 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 13px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group small {
    display: block;
    margin-top: 4px;
    font-size: 11px;
    color: var(--text-secondary);
}

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.checkbox-label input {
    width: 16px;
    height: 16px;
}

/* Filters */
.filters {
    display: flex;
    gap: 6px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    text-decoration: none;
    color: var(--text-secondary);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.filter-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.filter-btn:hover:not(.active) {
    background: #f1f5f9;
}

/* Bulk Actions */
.table-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.bulk-select {
    padding: 6px 10px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 12px;
    font-family: inherit;
}

/* Progress */
.progress-item {
    margin-bottom: 14px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    margin-bottom: 4px;
}

.progress-bar {
    height: 6px;
    background: #e2e8f0;
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.5s;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 30px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 36px;
    margin-bottom: 10px;
    display: block;
    opacity: 0.5;
}

.empty-state p {
    font-size: 14px;
}

/* Message Preview */
.msg-preview {
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-secondary);
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--card-bg);
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    max-height: 85vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: var(--card-bg);
}

.modal-header h3 {
    font-size: 15px;
}

.modal-close {
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 2px;
}

.modal-body {
    padding: 16px;
}

.message-detail p {
    margin-bottom: 10px;
    font-size: 13px;
    word-wrap: break-word;
}

.message-detail p strong {
    color: var(--text-primary);
}

/* Responsive - Tablet */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-2 {
        grid-template-columns: 1fr;
    }
}

/* Responsive - Mobile */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .sidebar-close {
        display: block;
    }
    .main-content {
        margin-left: 0;
    }
    .menu-toggle {
        display: block;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
    .stat-card {
        padding: 12px;
        gap: 10px;
    }
    .stat-icon {
        width: 38px;
        height: 38px;
        min-width: 38px;
        font-size: 16px;
    }
    .stat-info h3 {
        font-size: 18px;
    }
    .stat-info p {
        font-size: 11px;
    }
    .content-wrapper {
        padding: 14px;
    }
    .page-header h1 {
        font-size: 18px;
    }
    .table {
        min-width: 500px;
    }
    .table th,
    .table td {
        padding: 8px 10px;
    }
    .card-header {
        padding: 12px 14px;
    }
    .card-body {
        padding: 14px;
    }
    .btn {
        padding: 7px 12px;
        font-size: 12px;
    }
    .filters {
        gap: 4px;
    }
    .filter-btn {
        padding: 5px 10px;
        font-size: 11px;
    }
    .modal {
        max-height: 90vh;
    }
}

/* Responsive - Small Mobile */
@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .stat-card {
        flex-direction: row;
    }
    .topbar {
        padding: 10px 14px;
    }
    .admin-name span {
        display: none;
    }
    .content-wrapper {
        padding: 10px;
    }
    .page-header h1 {
        font-size: 16px;
    }
    .page-header p {
        font-size: 12px;
    }
}