/* ========================================
   Knowledge Base — Design System
   Matching Playhem CRM design tokens
   ======================================== */

/* CSS Variables */
:root {
    --bg-page: #0a0e1a;
    --bg-surface: #111827;
    --bg-elevated: #1e293b;
    --bg-input: #0f172a;

    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-soft: rgba(59, 130, 246, 0.15);

    --success: #22c55e;
    --success-soft: rgba(34, 197, 94, 0.15);
    --danger: #ef4444;
    --danger-soft: rgba(239, 68, 68, 0.15);
    --warning: #f59e0b;
    --warning-soft: rgba(245, 158, 11, 0.15);

    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border: #1e3a5f;
    --border-subtle: rgba(59, 130, 246, 0.15);
    --border-hover: rgba(59, 130, 246, 0.3);

    --sidebar-width: 260px;
    --topbar-height: 60px;

    --radius: 8px;
    --radius-lg: 12px;

    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.4);

    --transition: 0.2s ease;

    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 14px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--accent-hover);
}

/* ========================================
   Layout
   ======================================== */

.app-layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-surface);
    border-right: 1px solid var(--border-subtle);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent);
    border-bottom: 1px solid var(--border-subtle);
}

.sidebar-logo img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    object-fit: contain;
}

.sidebar-logo i {
    width: 24px;
    height: 24px;
}

.sidebar-nav {
    flex: 1;
    padding: 12px 8px;
    overflow-y: auto;
}

.nav-section-title {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    padding: 12px 14px 6px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition);
    cursor: pointer;
    text-decoration: none;
}

.nav-item:hover {
    background: var(--accent-soft);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent);
    color: #fff;
}

.nav-item i {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.sidebar-footer {
    border-top: 1px solid var(--border-subtle);
    padding: 12px;
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.sidebar-user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-weight: 600;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.sidebar-user-info {
    flex: 1;
    min-width: 0;
}

.sidebar-user-name {
    color: var(--text-primary);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-role {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: capitalize;
}

.sidebar-logout {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px;
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition);
    text-decoration: none;
    margin-top: 4px;
}

.sidebar-logout:hover {
    background: var(--danger-soft);
    color: var(--danger);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Topbar */
.topbar {
    height: var(--topbar-height);
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    border-bottom: 1px solid var(--border-subtle);
    background: var(--bg-surface);
    position: sticky;
    top: 0;
    z-index: 50;
}

.topbar-hamburger {
    display: none;
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 6px 8px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
}

.topbar-hamburger:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.topbar-title {
    font-size: 1.2rem;
    font-weight: 600;
    flex: 1;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Content Area */
.content {
    flex: 1;
    padding: 24px;
}

/* ========================================
   Components
   ======================================== */

/* Cards */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 20px;
    backdrop-filter: blur(10px);
    transition: border-color var(--transition);
}

.card:hover {
    border-color: var(--border-hover);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
}

/* Stat Cards */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 20px;
    backdrop-filter: blur(10px);
    transition: border-color var(--transition);
}

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

.stat-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
}

.stat-card.accent .stat-value { color: var(--accent); }
.stat-card.success .stat-value { color: var(--success); }
.stat-card.warning .stat-value { color: var(--warning); }
.stat-card.danger .stat-value { color: var(--danger); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 500;
    font-family: var(--font);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    line-height: 1.4;
}

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

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

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

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

.btn-success:hover {
    background: #16a34a;
    color: #fff;
}

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

.btn-danger:hover {
    background: #dc2626;
    color: #fff;
}

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

.btn-ghost:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.btn-sm {
    padding: 5px 10px;
    font-size: 0.8rem;
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 9px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.9rem;
    transition: border-color var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

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

.form-help {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.form-error {
    font-size: 0.78rem;
    color: var(--danger);
    margin-top: 4px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.form-section {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-subtle);
}

.form-section-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 16px;
}

/* Tables */
.table-wrap {
    overflow: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

thead th {
    background: var(--bg-elevated);
    padding: 12px 16px;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: left;
    white-space: nowrap;
}

tbody td {
    padding: 12px 16px;
    border-top: 1px solid var(--border-subtle);
    color: var(--text-primary);
}

tbody tr:hover {
    background: rgba(59, 130, 246, 0.05);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.badge-success {
    background: var(--success-soft);
    color: var(--success);
}

.badge-danger {
    background: var(--danger-soft);
    color: var(--danger);
}

.badge-warning {
    background: var(--warning-soft);
    color: var(--warning);
}

.badge-info {
    background: var(--accent-soft);
    color: var(--accent);
}

.badge-muted {
    background: rgba(100, 116, 139, 0.15);
    color: var(--text-muted);
}

/* Flash Messages */
.flash {
    margin: 0 0 16px;
    padding: 12px 16px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.9rem;
}

.flash-success {
    background: var(--success-soft);
    color: var(--success);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.flash-error {
    background: var(--danger-soft);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.flash-warning {
    background: var(--warning-soft);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.flash-close {
    background: none;
    border: none;
    color: inherit;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 4px;
    opacity: 0.7;
}

.flash-close:hover {
    opacity: 1;
}

/* Modals */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

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

.modal {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 600px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 1.05rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.3rem;
    padding: 4px;
    cursor: pointer;
    transition: color var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.empty-state i {
    width: 48px;
    height: 48px;
    opacity: 0.5;
    margin-bottom: 12px;
}

.empty-state p {
    margin-top: 8px;
    font-size: 0.9rem;
}

/* Tags */
.tag {
    display: inline-block;
    padding: 2px 8px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin: 2px;
}

/* Toggle Switch */
.toggle {
    position: relative;
    width: 44px;
    height: 24px;
    cursor: pointer;
    display: inline-block;
}

.toggle input {
    display: none;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 999px;
    transition: all var(--transition);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--text-muted);
    left: 2px;
    bottom: 2px;
    transition: all var(--transition);
}

.toggle input:checked + .toggle-slider {
    background: var(--accent);
    border-color: var(--accent);
}

.toggle input:checked + .toggle-slider::before {
    transform: translateX(20px);
    background: #fff;
}

/* Spinner */
.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* Search Box */
.search-box {
    position: relative;
}

.search-box input {
    padding-left: 36px;
}

.search-box i {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-muted);
    pointer-events: none;
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 16px;
    justify-content: center;
}

.pagination a,
.pagination span {
    padding: 6px 12px;
    border-radius: var(--radius);
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition);
}

.pagination a:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.pagination .active {
    background: var(--accent);
    color: #fff;
}

/* Grid Layouts */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

/* ========================================
   Auth Pages
   ======================================== */

.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-page);
    padding: 20px;
}

.auth-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 440px;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
}

.auth-logo {
    text-align: center;
    margin-bottom: 32px;
}

.auth-logo i {
    width: 40px;
    height: 40px;
    color: var(--accent);
}

.auth-logo h1 {
    font-size: 1.4rem;
    margin-top: 10px;
    color: var(--text-primary);
}

.auth-logo p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 4px;
}

.auth-error {
    background: var(--danger-soft);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius);
    padding: 10px 14px;
    margin-bottom: 16px;
    font-size: 0.85rem;
}

.auth-submit {
    width: 100%;
    padding: 11px;
    font-size: 0.95rem;
    justify-content: center;
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--accent);
    font-weight: 500;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

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

    .topbar-hamburger {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
    }

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

    .stat-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .content {
        padding: 16px;
    }

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

    .auth-card {
        padding: 24px;
    }
}