:root {
    --primary: #4e73df;
    --primary-dark: #2e59d9;
    --primary-light: #eef2ff;
    --secondary: #858796;
    --success: #1cc88a;
    --success-light: #d4edda;
    --info: #36b9cc;
    --warning: #f6c23e;
    --danger: #e74a3b;
    --danger-light: #f8d7da;
    --dark: #5a5c69;
    --gray-100: #f8f9fc;
    --gray-200: #eaecf4;
    --gray-300: #dddfeb;
    --gray-400: #d1d3e2;
    --gray-500: #b7b9cc;
    --gray-600: #858796;
    --gray-700: #6e707e;
    --sidebar-bg: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
    --sidebar-width: 250px;
    --header-height: 70px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gray-100);
    min-height: 100vh;
    color: #333;
    font-size: 14px;
    line-height: 1.5;
}

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

.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    transition: transform 0.3s ease;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 4px; }

.sidebar-brand {
    padding: 24px 20px 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    flex-shrink: 0;
}

.sidebar-brand h4 {
    color: #fff;
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.5px;
}

.sidebar-brand h4 i { margin-right: 8px; }

.sidebar-brand small {
    color: rgba(255,255,255,0.45);
    font-size: 0.75rem;
    display: block;
    margin-top: 4px;
}

.sidebar-nav {
    list-style: none;
    padding: 12px 0;
    flex: 1;
}

.sidebar-nav li a {
    display: flex;
    align-items: center;
    padding: 11px 24px;
    color: rgba(255,255,255,0.55);
    text-decoration: none;
    transition: var(--transition);
    gap: 12px;
    font-size: 0.9rem;
    font-weight: 500;
    border-left: 3px solid transparent;
}

.sidebar-nav li a:hover {
    background: rgba(255,255,255,0.05);
    color: rgba(255,255,255,0.9);
}

.sidebar-nav li a.active {
    background: rgba(255,255,255,0.08);
    color: #fff;
    border-left-color: var(--primary);
}

.sidebar-nav li a i {
    width: 20px;
    text-align: center;
    font-size: 1rem;
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid rgba(255,255,255,0.08);
    flex-shrink: 0;
}

.sidebar-footer a {
    display: flex;
    align-items: center;
    gap: 12px;
    color: rgba(255,255,255,0.45);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.sidebar-footer a:hover { color: var(--danger); }

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

.page-content { padding: 24px; flex: 1; }

.topbar {
    background: #fff;
    padding: 0 24px;
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 999;
}

.topbar h5 { margin: 0; color: var(--dark); font-weight: 700; font-size: 1.1rem; }

.topbar-right { display: flex; align-items: center; gap: 16px; }

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 12px;
    background: var(--gray-100);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--gray-700);
}

.user-info i { font-size: 1.3rem; color: var(--gray-500); }

.btn-logout {
    background: none;
    border: none;
    color: var(--gray-500);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 1.1rem;
    transition: var(--transition);
    cursor: pointer;
}

.btn-logout:hover { color: var(--danger); background: var(--danger-light); }

.card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: none;
    margin-bottom: 24px;
}

.card-header {
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    padding: 16px 24px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--dark);
    border-radius: var(--radius) var(--radius) 0 0 !important;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-body { padding: 24px; }

.stat-card {
    border: none;
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.stat-card .card-body { padding: 20px 24px; }

.stat-card .stat-icon {
    position: absolute;
    right: 16px;
    top: 16px;
    font-size: 2.5rem;
    opacity: 0.15;
    color: inherit;
}

.stat-card .stat-label {
    color: var(--gray-600);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 4px;
}

.stat-card .stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -1px;
}

.stat-card.stat-primary { background: linear-gradient(135deg, #4e73df 0%, #2e59d9 100%); color: #fff; }
.stat-card.stat-primary .stat-label,
.stat-card.stat-primary .stat-value { color: #fff; }

.stat-card.stat-success { background: linear-gradient(135deg, #1cc88a 0%, #17a673 100%); color: #fff; }
.stat-card.stat-success .stat-label,
.stat-card.stat-success .stat-value { color: #fff; }

.stat-card.stat-info { background: linear-gradient(135deg, #36b9cc 0%, #258391 100%); color: #fff; }
.stat-card.stat-info .stat-label,
.stat-card.stat-info .stat-value { color: #fff; }

.stat-card.stat-warning { background: linear-gradient(135deg, #f6c23e 0%, #dda20a 100%); color: #fff; }
.stat-card.stat-warning .stat-label,
.stat-card.stat-warning .stat-value { color: #fff; }

.table { margin-bottom: 0; }

.table th {
    border-top: none;
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    padding: 12px 16px;
    white-space: nowrap;
}

.table td {
    padding: 12px 16px;
    vertical-align: middle;
    border-color: var(--gray-200);
    font-size: 0.9rem;
}

.table-hover tbody tr:hover { background: var(--primary-light); }

.btn-group-xs .btn {
    padding: 4px 10px;
    font-size: 0.8rem;
}

.status-badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.status-draft { background: var(--gray-200); color: var(--gray-700); }
.status-sent { background: #cce5ff; color: #004085; }
.status-accepted { background: var(--success-light); color: #155724; }
.status-rejected { background: var(--danger-light); color: #721c24; }

.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 16px;
    display: block;
    color: var(--gray-400);
}

.empty-state p { color: var(--gray-600); margin-bottom: 20px; }

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }
    .sidebar.open { transform: translateX(0); }
    .content { margin-left: 0; }
    .page-content { padding: 16px; }
    .topbar { padding: 0 16px; }
    .mobile-toggle { display: block !important; }
}

.mobile-toggle { display: none; background: none; border: none; font-size: 1.3rem; color: var(--dark); cursor: pointer; padding: 8px; }

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
}

.sidebar.open ~ .sidebar-overlay { display: block; }

@media (max-width: 768px) {
    .sidebar-overlay { display: none; }
    .sidebar.open ~ .sidebar-overlay { display: block; }
}

.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    padding: 24px;
}

.auth-card {
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 440px;
    overflow: hidden;
}

.auth-header {
    text-align: center;
    padding: 40px 32px 16px;
}

.auth-header .auth-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-light);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.auth-header .auth-icon i { font-size: 1.8rem; color: var(--primary); }

.auth-header h3 { font-weight: 700; color: var(--dark); font-size: 1.4rem; }
.auth-header p { color: var(--gray-600); font-size: 0.9rem; }

.auth-body { padding: 16px 32px 40px; }

.form-floating { margin-bottom: 16px; }

.form-control, .form-select {
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--gray-300);
    padding: 10px 14px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(78,115,223,0.15);
}

label { font-weight: 500; font-size: 0.85rem; color: var(--gray-700); margin-bottom: 6px; }

.btn {
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 10px 20px;
    transition: var(--transition);
}

.btn-primary { background: var(--primary); border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-1px); }

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

.logo-upload {
    width: 120px;
    height: 120px;
    border: 2.5px dashed var(--gray-400);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    overflow: hidden;
    margin: 8px auto;
    transition: var(--transition);
    background: var(--gray-100);
}

.logo-upload:hover { border-color: var(--primary); background: var(--primary-light); }

.logo-upload img { width: 100%; height: 100%; object-fit: cover; }
.logo-upload i { font-size: 2rem; color: var(--gray-400); }

.product-row {
    background: #fff;
    padding: 6px 0;
    border-radius: 6px;
    margin-bottom: 4px;
    border: 1px solid var(--gray-200);
    transition: box-shadow 0.15s ease, border-color 0.15s ease;
}

.product-row:hover {
    box-shadow: 0 1px 4px rgba(0,0,0,0.05);
    border-color: var(--gray-400);
}

.product-row .form-control-sm {
    font-size: 0.82rem;
    padding: 5px 8px;
    border-radius: 4px;
    border: 1px solid var(--gray-300);
    background: #fff;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.product-row .form-control-sm:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(78,115,223,0.15);
    background: #fff;
}

.product-row a.text-danger {
    opacity: 0.35;
    transition: opacity 0.15s ease;
    font-size: 0.95rem;
}

.product-row:hover a.text-danger {
    opacity: 1;
}

.nav-tabs {
    border-bottom: 2px solid var(--gray-200);
    gap: 4px;
}

.nav-tabs .nav-link {
    border: none;
    color: var(--gray-600);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 10px 20px;
    border-radius: 0;
    margin-bottom: -2px;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.nav-tabs .nav-link:hover { color: var(--primary); border-color: transparent; }
.nav-tabs .nav-link.active { color: var(--primary); background: none; border-bottom-color: var(--primary); }

.modal-content {
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

.modal-header {
    border-bottom: 1px solid var(--gray-200);
    padding: 20px 24px;
}

.modal-header .modal-title { font-weight: 700; font-size: 1.1rem; }

.modal-body { padding: 24px; }

.modal-footer {
    border-top: 1px solid var(--gray-200);
    padding: 16px 24px;
}

.alert {
    border-radius: var(--radius-sm);
    border: none;
    padding: 14px 20px;
    font-size: 0.9rem;
}

.alert-success { background: var(--success-light); color: #155724; }
.alert-danger { background: var(--danger-light); color: #721c24; }

.quick-action-card {
    text-align: center;
    padding: 24px;
    background: #fff;
    border-radius: var(--radius);
    border: 1.5px dashed var(--gray-300);
    transition: var(--transition);
    cursor: pointer;
}

.quick-action-card:hover {
    border-color: var(--primary);
    background: var(--primary-light);
    transform: translateY(-2px);
}

.quick-action-card i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 12px;
    display: block;
}

.quick-action-card span {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--dark);
}

.badge {
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 6px;
}

.table-responsive { border-radius: var(--radius-sm); }

.summary-table td { padding: 8px 12px; border: none; }
.summary-table tr:last-child td { border-top: 2px solid var(--primary); }