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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --success: #16a34a;
    --success-light: #dcfce7;
    --warning: #d97706;
    --warning-light: #fef3c7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
}

/* ─── Navbar ───────────────────────────────────── */
.navbar {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}
.nav-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-brand .logo { font-size: 24px; }
.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-links a {
    text-decoration: none;
    padding: 8px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    transition: all 0.15s;
}
.nav-links a:hover { background: var(--gray-100); color: var(--gray-900); }
.nav-links a.active { background: var(--primary-light); color: var(--primary); }

/* ─── Buttons ──────────────────────────────────── */
.btn-primary {
    background: var(--primary);
    color: white !important;
    font-weight: 600;
}
.btn-primary:hover { background: var(--primary-dark) !important; }
.btn-secondary {
    background: white;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}
.btn-secondary:hover { background: var(--gray-100); }
.btn-sm {
    padding: 4px 12px;
    font-size: 13px;
    border-radius: 6px;
    text-decoration: none;
    color: var(--primary);
    font-weight: 500;
}
.btn-sm:hover { background: var(--primary-light); }
.btn-lg { padding: 12px 28px; font-size: 16px; }
.btn-add-ligne {
    background: var(--gray-100);
    border: 2px dashed var(--gray-300);
    color: var(--gray-600);
    padding: 8px 16px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    width: 100%;
    margin-top: 8px;
    transition: all 0.15s;
}
.btn-add-ligne:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.btn-remove-ligne {
    background: none;
    border: none;
    color: var(--gray-400);
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    line-height: 1;
}
.btn-remove-ligne:hover { color: var(--danger); background: var(--danger-light); }

/* ─── Container ────────────────────────────────── */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 24px;
}
h1 { font-size: 28px; font-weight: 700; margin-bottom: 24px; color: var(--gray-900); }
h2 { font-size: 20px; font-weight: 600; margin: 32px 0 16px; color: var(--gray-800); }
h3 { font-size: 14px; font-weight: 600; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }

/* ─── Stats Grid ───────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 8px;
}
.stat-card {
    background: white;
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    border-left: 4px solid var(--gray-300);
}
.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
}
.stat-label {
    font-size: 13px;
    color: var(--gray-500);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.stat-brouillon { border-left-color: var(--gray-400); }
.stat-envoyee { border-left-color: var(--primary); }
.stat-payee { border-left-color: var(--success); }
.stat-retard { border-left-color: var(--danger); }
.stat-ca { border-left-color: var(--warning); }
.stat-ca .stat-number { font-size: 24px; }

/* ─── Badges ───────────────────────────────────── */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}
.badge-lg { padding: 5px 14px; font-size: 14px; }
.badge-brouillon { background: var(--gray-100); color: var(--gray-600); }
.badge-envoyee { background: var(--primary-light); color: var(--primary); }
.badge-payee { background: var(--success-light); color: var(--success); }
.badge-retard { background: var(--danger-light); color: var(--danger); }

/* ─── Tables ───────────────────────────────────── */
.table-wrapper {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
}
thead th {
    background: var(--gray-50);
    padding: 12px 16px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--gray-200);
}
tbody td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-100);
    font-size: 14px;
}
tbody tr:hover { background: var(--gray-50); }
tfoot td {
    padding: 10px 16px;
    font-size: 14px;
    border-top: 1px solid var(--gray-200);
}
.total-final-row td {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary);
    border-top: 2px solid var(--primary);
}
.montant { text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; }
.text-right { text-align: right; }
.text-danger { color: var(--danger); font-weight: 600; }

/* ─── Filter Bar ───────────────────────────────── */
.filter-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.filter-chip {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    color: var(--gray-600);
    background: white;
    border: 1px solid var(--gray-200);
    transition: all 0.15s;
}
.filter-chip:hover { border-color: var(--primary); color: var(--primary); }
.filter-chip.active { background: var(--primary); color: white; border-color: var(--primary); }

/* ─── Empty State ──────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-500);
}
.empty-state p { font-size: 16px; margin-bottom: 16px; }

/* ─── Facture Detail ───────────────────────────── */
.facture-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}
.facture-header h1 { margin-bottom: 0; }
.facture-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}
.inline-form { display: inline; }
.statut-changer select {
    padding: 8px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    background: white;
    cursor: pointer;
}
.facture-details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.detail-card {
    background: white;
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}
.detail-card .client-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 4px;
}
.detail-card p { font-size: 14px; color: var(--gray-600); margin-bottom: 2px; }
.detail-row {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    font-size: 14px;
}
.detail-row span:first-child { color: var(--gray-500); }
.detail-row span:last-child { font-weight: 500; }
.total-row {
    border-top: 1px solid var(--gray-200);
    margin-top: 4px;
    padding-top: 10px;
    font-size: 16px;
    font-weight: 700;
    color: var(--primary);
}
.notes-card {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-bottom: 24px;
    border-left: 4px solid var(--warning);
}
.notes-card p { font-size: 14px; color: var(--gray-700); }
.back-link { margin-top: 24px; }
.back-link a { color: var(--gray-500); text-decoration: none; font-size: 14px; }
.back-link a:hover { color: var(--primary); }

/* ─── Forms ────────────────────────────────────── */
fieldset {
    border: none;
    background: white;
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}
legend {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 16px;
    padding: 0;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 12px;
}
.form-group { display: flex; flex-direction: column; }
.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-600);
    margin-bottom: 4px;
}
.form-group input,
.form-group select,
.form-group textarea {
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.15s;
    background: white;
}
.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-group textarea { resize: vertical; }

/* ─── Lignes de facture ────────────────────────── */
.ligne-row {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
}
.ligne-desc { flex: 3; }
.ligne-qte { flex: 1; }
.ligne-prix { flex: 1.5; }
.ligne-total {
    flex: 1;
    text-align: right;
    font-weight: 600;
    font-size: 14px;
    color: var(--gray-700);
    padding: 0 8px;
}
.ligne-row input {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 14px;
}
.ligne-row input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

/* ─── Totals Summary ───────────────────────────── */
.totals-summary {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 2px solid var(--gray-200);
    max-width: 350px;
    margin-left: auto;
}
.total-line {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    font-size: 14px;
}
.total-line span:first-child { color: var(--gray-500); }
.total-line span:last-child { font-weight: 600; }
.total-final {
    border-top: 2px solid var(--primary);
    margin-top: 6px;
    padding-top: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
}

/* ─── Form Actions ─────────────────────────────── */
.form-actions {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-top: 8px;
}

/* ─── Auth Pages ───────────────────────────────── */
.auth-page {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 50%, #f0f9ff 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.auth-container {
    width: 100%;
    max-width: 420px;
    padding: 24px;
}
.auth-card {
    background: white;
    border-radius: 12px;
    padding: 40px 32px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
}
.auth-header {
    text-align: center;
    margin-bottom: 28px;
}
.auth-header .logo { font-size: 40px; display: block; margin-bottom: 8px; }
.auth-header h1 { font-size: 24px; margin-bottom: 4px; }
.auth-header p { color: var(--gray-500); font-size: 14px; }
.auth-card .form-group { margin-bottom: 16px; }
.auth-card .form-group input {
    padding: 12px 14px;
    font-size: 15px;
}
.btn-full { width: 100%; }
.auth-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-100);
    font-size: 14px;
    color: var(--gray-500);
}
.auth-footer a {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
}
.auth-footer a:hover { text-decoration: underline; }

/* ─── Flash Messages ───────────────────────────── */
.flash-messages {
    margin-bottom: 20px;
}
.flash {
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 8px;
    border-left: 4px solid;
}
.flash-success {
    background: var(--success-light);
    color: var(--success);
    border-color: var(--success);
}
.flash-error {
    background: var(--danger-light);
    color: var(--danger);
    border-color: var(--danger);
}
.flash-warning {
    background: var(--warning-light);
    color: var(--warning);
    border-color: var(--warning);
}
.flash-info {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
}

/* ─── Nav User ──────────────────────────────────── */
.nav-user {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    padding: 4px 10px;
    background: var(--gray-100);
    border-radius: 6px;
    margin-left: 4px;
}
.nav-logout {
    font-size: 13px;
    color: var(--gray-500) !important;
    padding: 6px 10px !important;
}
.nav-logout:hover { color: var(--danger) !important; background: var(--danger-light) !important; }

/* ─── Responsive ───────────────────────────────── */
@media (max-width: 768px) {
    .navbar { padding: 0 16px; }
    .nav-links { gap: 4px; }
    .nav-links a { padding: 6px 10px; font-size: 13px; }
    .container { padding: 20px 16px; }
    h1 { font-size: 22px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .form-row { grid-template-columns: 1fr; }
    .facture-details-grid { grid-template-columns: 1fr; }
    .facture-header { flex-direction: column; align-items: flex-start; }
    .ligne-row { flex-wrap: wrap; }
    .ligne-desc { flex: 100%; }
    .ligne-qte, .ligne-prix { flex: 1; }
    .ligne-total { flex: 1; }
}