/* ===================================
   CSS Variables (Design Tokens)
   =================================== */
:root {
    /* Colors */
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    /* Text */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-inverse: #ffffff;
    
    /* Borders */
    --border-color: #e2e8f0;
    --border-radius: 8px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Font */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* ===================================
   Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* ===================================
   Auth Pages
   =================================== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.auth-container {
    width: 100%;
    max-width: 450px;
}

.auth-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-2xl);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.auth-header h1 {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.auth-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===================================
   Forms
   =================================== */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: var(--font-family);
    background-color: var(--input-bg);
    color: var(--text-primary);
    transition: all 0.2s;
}

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

.form-help {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.form-actions {
    margin-top: var(--spacing-md);
}

.form-links {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    align-items: center;
}

.separator {
    color: var(--border-color);
}

/* ===================================
   Buttons
   =================================== */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--text-inverse);
    width: 100%;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

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

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

.btn-link {
    background: none;
    border: none;
    color: var(--primary);
    padding: 0;
    font-size: 0.875rem;
}

.btn-link:hover {
    text-decoration: underline;
}

.link {
    color: var(--primary);
    text-decoration: none;
}

.link:hover {
    text-decoration: underline;
}

/* ===================================
   Messages
   =================================== */
.error-message,
.success-message {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-lg);
    font-size: 0.875rem;
}

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

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

/* ===================================
   Navbar
   =================================== */
.navbar {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.navbar-brand h1 {
    font-size: 1.25rem;
    color: var(--primary);
}

.navbar-menu {
    flex: 1;
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all 0.2s;
    font-size: 0.875rem;
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background-color: var(--primary-light);
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-name {
    font-weight: 600;
    color: var(--text-primary);
}

/* ===================================
   Main Content
   =================================== */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.container {
    width: 100%;
}

.page-title {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

/* ===================================
   Stats Grid
   =================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.stat-icon {
    font-size: 2.5rem;
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===================================
   Dashboard Grid
   =================================== */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.dashboard-section {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.section-header h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.content-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.content-item {
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: all 0.2s;
}

.content-item:hover {
    box-shadow: var(--shadow);
    border-color: var(--primary-light);
}

.loading {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl);
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-2xl);
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 768px) {
    .navbar-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .navbar-menu {
        flex-direction: column;
        width: 100%;
    }
    
    .navbar-user {
        width: 100%;
        justify-content: space-between;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Invoice & Quote Details Pages
   =================================== */
.invoice-details-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.detail-header {
    padding: var(--spacing-xl);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.detail-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.detail-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.detail-status {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 0.875rem;
}

.detail-section {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.detail-section:last-child {
    border-bottom: none;
}

.detail-section h4 {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.detail-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.detail-value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* Items Table */
.items-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
}

.items-table thead {
    background: var(--bg-tertiary);
}

.items-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.items-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.items-table tbody tr:hover {
    background: var(--bg-tertiary);
}

.items-table tbody tr:last-child td {
    border-bottom: none;
}

/* Totals Section */
.totals-section {
    max-width: 400px;
    margin-left: auto;
}

.total-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    color: var(--text-primary);
}

.total-row.total-final {
    border-top: 2px solid var(--border-color);
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-md);
    font-size: 1.125rem;
    font-weight: 700;
}

.total-row.total-due {
    color: var(--danger);
    font-weight: 700;
    font-size: 1.125rem;
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--bg-tertiary);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===================================
   Quote Actions (Approve/Reject)
   =================================== */
.quote-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.quote-actions-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: italic;
}

.alert {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 0.9375rem;
    font-weight: 500;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #10b981;
}

.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
    border: 1px solid #3b82f6;
}

.btn-success {
    background-color: var(--success);
    color: var(--text-inverse);
    flex: 1;
}

.btn-success:hover {
    background-color: #059669;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-danger {
    background-color: var(--danger);
    color: var(--text-inverse);
    flex: 1;
}

.btn-danger:hover {
    background-color: #dc2626;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-success:disabled,
.btn-danger:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Responsive adjustments for details */
@media (max-width: 768px) {
    .detail-header {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .detail-grid {
        grid-template-columns: 1fr;
    }
    
    .items-table {
        font-size: 0.875rem;
    }
    
    .items-table th,
    .items-table td {
        padding: var(--spacing-sm);
    }
    
    .totals-section {
        max-width: 100%;
    }

    .quote-actions {
        flex-direction: column;
    }
}

/* ===================================
   NOTIFICATIONS CLIENT - Phase 6.3
   =================================== */

.notification-wrapper {
    position: relative;
    display: inline-block;
}

.notification-bell {
    position: relative;
    background: none;
    border: none;
    padding: var(--spacing-sm);
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.2s;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.notification-bell:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary);
}

.notification-bell.has-notifications {
    animation: bellRing 0.5s ease-in-out;
}

@keyframes bellRing {
    0%, 100% { transform: rotate(0deg); }
    10%, 30%, 50%, 70%, 90% { transform: rotate(-10deg); }
    20%, 40%, 60%, 80% { transform: rotate(10deg); }
}

.notification-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    background-color: var(--danger);
    color: white;
    border-radius: 10px;
    padding: 2px 6px;
    font-size: 11px;
    font-weight: 600;
    min-width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.notification-panel {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 380px;
    max-height: 500px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    display: none;
    flex-direction: column;
    z-index: 1000;
}

.notification-panel.open {
    display: flex;
}

.notification-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-secondary);
}

.notification-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.notification-list {
    overflow-y: auto;
    max-height: 420px;
    flex: 1;
}

.notification-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
    position: relative;
}

.notification-item:hover {
    background-color: var(--bg-secondary);
}

.notification-item.unread {
    background-color: #eff6ff;
}

.notification-item.unread:hover {
    background-color: #dbeafe;
}

.notification-icon {
    font-size: 24px;
    flex-shrink: 0;
}

.notification-content {
    flex: 1;
    min-width: 0;
}

.notification-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    font-size: 0.875rem;
}

.notification-message {
    color: var(--text-secondary);
    font-size: 0.813rem;
    line-height: 1.4;
    margin-bottom: 4px;
}

.notification-time {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.notification-dot {
    position: absolute;
    top: 16px;
    right: 12px;
    width: 8px;
    height: 8px;
    background-color: var(--primary);
    border-radius: 50%;
}

.notification-empty {
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--text-secondary);
}

.notification-empty .empty-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.notification-empty p {
    margin: 0;
    font-size: 0.875rem;
}

.notification-loading {
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--text-secondary);
}

.notification-loading .spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    animation: spin 0.8s linear infinite;
}

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

/* Couleurs selon le level */
.notification-item.level-success .notification-icon {
    color: var(--success);
}

.notification-item.level-warning .notification-icon {
    color: var(--warning);
}

.notification-item.level-danger .notification-icon {
    color: var(--danger);
}

.notification-item.level-info .notification-icon {
    color: var(--info);
}

/* Responsive notifications */
@media (max-width: 480px) {
    .notification-panel {
        width: 100vw;
        max-width: calc(100vw - 32px);
        right: -16px;
    }
}

/* ===================================
   DARK THEME
   =================================== */
body.theme-dark {
    /* Colors - Dark Mode */
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.1);
    --secondary: #94a3b8;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Backgrounds - Dark Mode */
    --bg-primary: #111827;
    --bg-secondary: #0a0e1a;
    --bg-tertiary: #1a2332;
    
    /* Text - Dark Mode */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-inverse: #1e293b;
    
    /* Borders - Dark Mode */
    --border-color: #2d3748;
    
    /* Shadows - Dark Mode */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

/* Override specific elements for dark theme */
body.theme-dark .auth-card,
body.theme-dark .navbar,
body.theme-dark .stat-card,
body.theme-dark .dashboard-section,
body.theme-dark .invoice-card,
body.theme-dark .quote-card,
body.theme-dark .appointment-card,
body.theme-dark .maintenance-card,
body.theme-dark .vehicle-card,
body.theme-dark .payment-card {
    background: var(--bg-primary);
    color: var(--text-primary);
}

body.theme-dark input,
body.theme-dark select,
body.theme-dark textarea {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

body.theme-dark input:focus,
body.theme-dark select:focus,
body.theme-dark textarea:focus {
    border-color: var(--primary);
    background: var(--bg-primary);
}

body.theme-dark .btn-outline {
    border-color: var(--border-color);
    color: var(--text-primary);
}

body.theme-dark .btn-outline:hover {
    background: var(--bg-tertiary);
}

body.theme-dark .table th {
    background: var(--bg-tertiary);
}

body.theme-dark .table tr:hover {
    background: var(--bg-tertiary);
}

body.theme-dark .notification-panel {
    background: var(--bg-primary);
}

body.theme-dark .notification-item:not(.read) {
    background: var(--bg-tertiary);
}

body.theme-dark .notification-item:hover {
    background: rgba(99, 102, 241, 0.05);
}

body.theme-dark .badge-pending {
    background: rgba(245, 158, 11, 0.2);
    color: #fbbf24;
}

body.theme-dark .badge-paid {
    background: rgba(16, 185, 129, 0.2);
    color: #4ade80;
}

body.theme-dark .badge-overdue {
    background: rgba(239, 68, 68, 0.2);
    color: #f87171;
}

body.theme-dark .modal-content {
    background: var(--bg-primary);
}

body.theme-dark .section-header h2 {
    color: var(--text-primary);
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
}

.theme-toggle-icon {
    font-size: 1.25rem;
}