/* Admin Panel — Modern, minimal */

:root {
    --admin-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --admin-bg: #f8fafc;
    --admin-surface: #ffffff;
    --admin-border: #e2e8f0;
    --admin-border-light: #f1f5f9;
    --admin-text: #0f172a;
    --admin-text-muted: #64748b;
    --admin-text-subtle: #94a3b8;
    --admin-accent: #475569;
    --admin-accent-hover: #334155;
    --admin-primary: #3b82f6;
    --admin-primary-hover: #2563eb;
    --admin-success: #22c55e;
    --admin-danger: #ef4444;
    --admin-warning: #f59e0b;
    --admin-radius: 12px;
    --admin-radius-sm: 8px;
    --admin-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --admin-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --sidebar-w: 240px;
}

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

.admin-body {
    font-family: var(--admin-font);
    font-size: 15px;
    line-height: 1.5;
    background: var(--admin-bg);
    color: var(--admin-text);
    -webkit-font-smoothing: antialiased;
}

.admin-shell {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.admin-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-w);
    height: 100vh;
    background: var(--admin-surface);
    border-right: 1px solid var(--admin-border-light);
    display: flex;
    flex-direction: column;
    z-index: 40;
    overflow-y: auto;
}

.admin-sidebar__brand {
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid var(--admin-border-light);
}

.admin-sidebar__brand-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--admin-text);
    font-weight: 600;
    font-size: 1rem;
}

.admin-sidebar__logo {
    width: 36px;
    height: 36px;
    border-radius: var(--admin-radius-sm);
    background: var(--admin-accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
}

.admin-sidebar__title {
    letter-spacing: -0.01em;
}

.admin-sidebar__nav {
    flex: 1;
    padding: 1rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.admin-sidebar__link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.875rem;
    border-radius: var(--admin-radius-sm);
    color: var(--admin-text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: background 0.15s, color 0.15s;
}

.admin-sidebar__link:hover {
    background: var(--admin-border-light);
    color: var(--admin-text);
}

.admin-sidebar__link--active {
    background: var(--admin-border-light);
    color: var(--admin-text);
    font-weight: 600;
}

.admin-sidebar__icon {
    width: 1.25rem;
    text-align: center;
    font-size: 0.875rem;
    opacity: 0.85;
}

.admin-sidebar__link--sm {
    font-size: 0.875rem;
    padding: 0.5rem 0.875rem;
}

.admin-sidebar__external {
    margin-left: auto;
    font-size: 0.7rem;
    opacity: 0.5;
}

.admin-sidebar__tools {
    padding: 0 0.75rem 1rem;
    border-top: 1px solid var(--admin-border-light);
}

.admin-sidebar__label {
    display: block;
    padding: 0.5rem 0.875rem 0.25rem;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--admin-text-subtle);
}

.admin-sidebar__footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--admin-border-light);
    background: var(--admin-bg);
}

.admin-sidebar__user {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--admin-text);
    margin-bottom: 0.5rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.admin-sidebar__logout {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    color: var(--admin-text-muted);
    text-decoration: none;
    padding: 0.375rem 0;
    transition: color 0.15s;
}

.admin-sidebar__logout:hover {
    color: var(--admin-danger);
}

/* Main area */
.admin-main {
    flex: 1;
    margin-left: var(--sidebar-w);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow: auto;
}

.admin-content {
    flex: 1;
    padding: 2rem;
    overflow: auto;
}

/* Header */
.admin-header {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 2rem;
    background: var(--admin-surface);
    border-bottom: 1px solid var(--admin-border-light);
}

.admin-header__title {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--admin-text);
}

.admin-header__user {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.admin-header__avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}

.admin-header__name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--admin-text-muted);
}

/* Cards */
.stat-card,
.admin-card {
    background: var(--admin-surface);
    border-radius: var(--admin-radius);
    border: 1px solid var(--admin-border-light);
    box-shadow: var(--admin-shadow);
    padding: 1.5rem;
    transition: box-shadow 0.2s, border-color 0.2s;
}

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

.stat-card {
    padding: 1.25rem 1.5rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--admin-radius-sm);
    font-family: var(--admin-font);
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, opacity 0.15s;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--admin-primary-hover);
}

.btn-secondary {
    background: var(--admin-border-light);
    color: var(--admin-text);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--admin-border);
}

.btn-success {
    background: var(--admin-success);
    color: #fff;
}

.btn-success:hover:not(:disabled) {
    filter: brightness(0.95);
}

.btn-danger {
    background: var(--admin-danger);
    color: #fff;
}

.btn-danger:hover:not(:disabled) {
    filter: brightness(0.95);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--admin-text);
}

.form-input,
.form-select,
.form-textarea,
.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-family: var(--admin-font);
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--admin-text);
    background: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius-sm);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus,
.form-control:focus {
    outline: none;
    border-color: var(--admin-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

/* Tables */
table,
.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

thead {
    background: var(--admin-bg);
    border-bottom: 1px solid var(--admin-border);
}

th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--admin-text-muted);
}

td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--admin-border-light);
    color: var(--admin-text);
}

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

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-primary {
    background: rgba(59, 130, 246, 0.12);
    color: var(--admin-primary);
}

.badge-success {
    background: rgba(34, 197, 94, 0.12);
    color: var(--admin-success);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.12);
    color: var(--admin-danger);
}

/* Alerts */
.alert {
    padding: 0.875rem 1rem;
    border-radius: var(--admin-radius-sm);
    font-size: 0.9375rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

.alert-success {
    background: rgba(34, 197, 94, 0.08);
    border-color: rgba(34, 197, 94, 0.2);
    color: #166534;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.08);
    border-color: rgba(239, 68, 68, 0.2);
    color: #991b1b;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.08);
    border-color: rgba(245, 158, 11, 0.2);
    color: #92400e;
}

.alert-info {
    background: rgba(59, 130, 246, 0.08);
    border-color: rgba(59, 130, 246, 0.2);
    color: #1e40af;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    padding: 0.875rem 1.25rem;
    border-radius: var(--admin-radius-sm);
    background: var(--admin-surface);
    border: 1px solid var(--admin-border);
    box-shadow: var(--admin-shadow-md);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    z-index: 9999;
    font-size: 0.9375rem;
    animation: toastIn 0.25s ease;
}

.toast.success { border-left: 3px solid var(--admin-success); }
.toast.error { border-left: 3px solid var(--admin-danger); }
.toast.info { border-left: 3px solid var(--admin-primary); }

@keyframes toastIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Spinner */
.spinner {
    display: inline-block;
    width: 1.5rem;
    height: 1.5rem;
    border: 2px solid var(--admin-border);
    border-top-color: var(--admin-primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.4);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 1rem;
}

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

/* Question card */
.question-card {
    background: var(--admin-surface);
    border-radius: var(--admin-radius);
    border: 1px solid var(--admin-border-light);
    padding: 1.25rem 1.5rem;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.question-card:hover {
    box-shadow: var(--admin-shadow-md);
    border-color: var(--admin-border);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--admin-border-light);
}

::-webkit-scrollbar-thumb {
    background: var(--admin-border);
    border-radius: 4px;
}

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

/* Settings tabs */
.settings-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.625rem 1rem;
    font-family: var(--admin-font);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--admin-text-muted);
    background: transparent;
    border: none;
    border-left: 3px solid transparent;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    text-align: left;
}
.settings-tab:hover {
    background: var(--admin-border-light);
    color: var(--admin-text);
}
.settings-tab.active {
    background: var(--admin-border-light);
    color: var(--admin-text);
    border-left-color: var(--admin-primary);
    font-weight: 600;
}
.settings-content {
    display: none;
}
.settings-content.active {
    display: block;
}

/* Utilities */
.text-center { text-align: center; }
.text-muted { color: var(--admin-text-muted); }
.hidden { display: none !important; }
.loading { opacity: 0.6; pointer-events: none; }

/* Responsive */
@media (max-width: 768px) {
    .admin-sidebar {
        transform: translateX(-100%);
        transition: transform 0.2s;
    }
    .admin-sidebar.open {
        transform: translateX(0);
    }
    .admin-main {
        margin-left: 0;
    }
    .admin-content {
        padding: 1rem;
    }
    .admin-header {
        padding: 0.75rem 1rem;
    }
    .admin-header__title {
        font-size: 1.125rem;
    }
}