:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --bg-color: #ffffff;
    --surface-color: #f8fafc;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.login-header p {
    color: var(--text-muted);
}

.login-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-muted);
}

.header {
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header-title {
    font-size: 20px;
    font-weight: 600;
}

.menu-toggle {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-color);
    display: none;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background 0.2s;
}

.theme-toggle:hover {
    background: var(--border-color);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-name {
    font-weight: 500;
}

.container {
    display: flex;
    min-height: calc(100vh - 70px);
}

.sidebar {
    width: 250px;
    background: var(--surface-color);
    border-right: 1px solid var(--border-color);
    padding: 20px 0;
    transition: transform 0.3s;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--text-color);
    text-decoration: none;
    transition: background 0.2s;
}

.nav-item:hover {
    background: var(--border-color);
}

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

.nav-icon {
    font-size: 20px;
}

.main-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 28px;
    font-weight: 600;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    font-size: 36px;
}

.stat-info h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-info p {
    color: var(--text-muted);
    font-size: 14px;
}

.card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 20px;
    overflow: hidden;
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.card-header h2 {
    font-size: 20px;
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

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

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

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-weight: 600;
    background: var(--bg-color);
}

.table tbody tr:hover {
    background: rgba(37, 99, 235, 0.06);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    text-align: center;
}

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

.btn-primary:hover {
    background: #1d4ed8;
}

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

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

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

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

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

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

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-block {
    display: block;
    width: 100%;
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.badge-secondary {
    background: var(--border-color);
    color: var(--text-muted);
}

.badge-info {
    background: #dbeafe;
    color: #1e40af;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 14px;
}

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

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--surface-color);
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-header h2 {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-muted);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

.barbers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.barber-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.barber-photo {
    width: 120px;
    height: 120px;
    margin: 0 auto 15px;
    border-radius: 50%;
    overflow: hidden;
}

.barber-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.barber-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--border-color);
    font-size: 48px;
}

.barber-info h3 {
    margin-bottom: 10px;
}

.barber-info p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.barber-actions {
    margin-top: 15px;
    display: flex;
    gap: 10px;
    justify-content: center;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.schedule-day {
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 15px;
    background: var(--bg-color);
}

.day-header {
    margin-bottom: 10px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.day-times {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.public-link-section {
    max-width: 600px;
}

.link-display {
    display: flex;
    gap: 10px;
    margin: 15px 0 30px;
}

.link-display input {
    flex: 1;
}

.qr-code-display {
    text-align: center;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.header-actions {
    display: flex;
    gap: 10px;
}

.settings-tabs {
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
    overflow-x: auto;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    margin-bottom: -1px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    font: inherit;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 600;
}

.tab-heading {
    margin-bottom: 24px;
}

.tab-heading h3 {
    margin-bottom: 4px;
}

.setting-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px;
    margin-bottom: 12px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.setting-toggle h4 {
    margin-bottom: 4px;
}

.setting-toggle input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    flex-shrink: 0;
}

.devices-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.devices-toolbar h4,
.devices-section h4 {
    font-size: 15px;
    font-weight: 600;
}

.devices-section {
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.devices-section h4 {
    margin-bottom: 12px;
}

.devices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

.devices-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 24px;
    color: var(--text-muted);
}

.device-card {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.device-card h4 {
    font-size: 15px;
    font-weight: 600;
}

.device-card-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
}

.device-meta {
    font-size: 13px;
    color: var(--text-color);
}

.device-meta p {
    margin: 3px 0;
}

.devices-label {
    color: var(--text-muted);
}

.logs-tabs {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding: 0 8px;
    border-bottom: 1px solid var(--border-color);
}

.logs-tab {
    padding: 12px 20px;
    border: none;
    background: none;
    color: var(--text-muted);
    font: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px 8px 0 0;
    white-space: nowrap;
}

.logs-tab:hover {
    background: var(--border-color);
}

.logs-tab.active {
    background: var(--primary-color);
    color: #fff;
}

.logs-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.logs-header h3 {
    margin-bottom: 4px;
}

.logs-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.logs-toolbar input,
.logs-toolbar select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    color: var(--text-color);
    font: inherit;
    font-size: 14px;
}

.logs-toolbar input {
    flex: 1;
    min-width: 200px;
}

.logs-pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
}

.log-cell-muted {
    font-size: 12px;
    color: var(--text-muted);
}

.test-email-section {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.tab-panel {
    display: none;
}

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

code {
    background: var(--border-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .sidebar {
        position: fixed;
        left: 0;
        top: 70px;
        height: calc(100vh - 70px);
        transform: translateX(-100%);
        z-index: 99;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        padding: 20px;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .link-display {
        flex-direction: column;
    }
}

.backup-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.backup-status {
    margin-top: 16px;
    margin-bottom: 0;
}

.backup-status:empty {
    display: none;
}

.table-toolbar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 16px;
}

.table-search {
    width: 100%;
    max-width: 320px;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    color: var(--text-color);
    font: inherit;
    font-size: 14px;
}

.table-search:focus {
    outline: none;
    border-color: var(--primary-color);
}

[data-theme="dark"] .badge-success { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; }
[data-theme="dark"] .badge-danger { background: rgba(239, 68, 68, 0.2); color: #fca5a5; }
[data-theme="dark"] .badge-warning { background: rgba(245, 158, 11, 0.2); color: #fcd34d; }
[data-theme="dark"] .badge-info { background: rgba(59, 130, 246, 0.2); color: #93c5fd; }
[data-theme="dark"] .alert-error { background: rgba(239, 68, 68, 0.15); color: #fca5a5; border-color: rgba(239, 68, 68, 0.3); }
[data-theme="dark"] .alert-success { background: rgba(16, 185, 129, 0.15); color: #6ee7b7; border-color: rgba(16, 185, 129, 0.3); }
[data-theme="dark"] .alert-info { background: rgba(59, 130, 246, 0.15); color: #93c5fd; border-color: rgba(59, 130, 246, 0.3); }

@media (max-width: 768px) {
    .user-name {
        display: none;
    }

    .header-title {
        font-size: 16px;
    }

    .table-search {
        max-width: none;
    }
}