:root {
    --bg-main: #0b1120;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --bg-input: #0f172a;
    --border-color: #334155;
    --primary: #38bdf8;
    --primary-hover: #0284c7;
    --accent: #6366f1;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
}

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

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

/* Layout App Sidebar & Main */
.app-container {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: #0f172a;
    border-right: 1px solid var(--border-color);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.logo-icon {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}

.logo-text {
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--text-main);
}

.logo-sub {
    font-size: 0.75rem;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.75rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-item a:hover, .nav-item.active a {
    background: var(--bg-card);
    color: var(--primary);
}

.user-profile {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    font-size: 0.9rem;
}

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

/* Contenu Principal */
.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

.header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 700;
}

.page-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Cartesian Cards Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

.stat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Badges Statut */
.badge {
    padding: 0.25rem 0.65rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-block;
}

.badge-draft { background: rgba(148, 163, 184, 0.2); color: #cbd5e1; border: 1px solid #64748b; }
.badge-submitted { background: rgba(245, 158, 11, 0.2); color: #fcd34d; border: 1px solid #d97706; }
.badge-approved { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; border: 1px solid #059669; }
.badge-rejected { background: rgba(239, 68, 68, 0.2); color: #fca5a5; border: 1px solid #dc2626; }
.badge-paid { background: rgba(99, 102, 241, 0.2); color: #a5b4fc; border: 1px solid #4f46e5; }

/* Boutons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.25rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
}

.btn-primary:hover {
    opacity: 0.9;
    box-shadow: 0 4px 12px rgba(56, 189, 248, 0.3);
}

.btn-secondary {
    background: var(--bg-card-hover);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    border: 1px solid #dc2626;
}

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

/* Tables */
.table-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.custom-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.custom-table th {
    background: #0f172a;
    padding: 1rem 1.25rem;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border-color);
}

.custom-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.custom-table tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* OCR Dropzone & Scanner */
.dropzone {
    border: 2px dashed var(--primary);
    border-radius: var(--radius-md);
    background: rgba(56, 189, 248, 0.03);
    padding: 2.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
}

.dropzone:hover, .dropzone.dragover {
    background: rgba(56, 189, 248, 0.08);
    border-color: var(--accent);
}

.dropzone-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.ocr-scanner-active {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(56, 189, 248, 0.2);
    border-left-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Modals & Form Control */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-size: 0.95rem;
    transition: border-color 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

/* Notifications Flash */
.flash-messages {
    margin-bottom: 1.5rem;
}

.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.alert-success { background: rgba(16, 185, 129, 0.15); border: 1px solid var(--success); color: #6ee7b7; }
.alert-danger { background: rgba(239, 68, 68, 0.15); border: 1px solid var(--danger); color: #fca5a5; }
.alert-warning { background: rgba(245, 158, 11, 0.15); border: 1px solid var(--warning); color: #fcd34d; }
.alert-info { background: rgba(56, 189, 248, 0.15); border: 1px solid var(--primary); color: #93c5fd; }