:root {
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --bg: #f8fafc;
    --sidebar-bg: #1e293b;
    --sidebar-text: #94a3b8;
    --sidebar-active: #4f46e5;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --radius: 8px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

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

.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: width 0.3s;
}

.sidebar.collapsed { width: 70px; }
.sidebar.collapsed .sidebar-brand span,
.sidebar.collapsed .nav-item span { display: none; }

.sidebar-brand {
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-brand i { font-size: 1.5rem; color: var(--primary-light); }

.sidebar-nav {
    flex: 1;
    padding: 12px 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.nav-item:hover { background: rgba(255,255,255,0.05); color: #fff; }
.nav-item.active, .nav-item:focus { background: var(--sidebar-active); color: #fff; }
.nav-item i { width: 20px; text-align: center; font-size: 0.9rem; }

.main-content {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.top-bar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 50;
}

.menu-toggle {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text);
    cursor: pointer;
    padding: 4px 8px;
}

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

/* User menu dropdown */
.user-menu {
    position: relative;
}

.user-menu-trigger {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px 12px;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: 'Inter', sans-serif;
}

.user-menu-trigger:hover {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
}

.user-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-caret {
    font-size: 0.7rem;
    color: var(--text-light);
    transition: transform 0.2s;
}

.user-menu-dropdown {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    min-width: 240px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
    z-index: 200;
}

.user-menu-dropdown.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-menu-header {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
}

.user-menu-header strong {
    display: block;
    font-size: 0.85rem;
    color: var(--text);
    word-break: break-all;
}

.user-menu-header span {
    font-size: 0.75rem;
    color: var(--text-light);
}

.logout-form {
    margin: 0;
}

.logout-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    background: #fee2e2;
    color: #b91c1c;
    border: 1px solid #fecaca;
    border-radius: var(--radius);
    padding: 10px 12px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
    font-family: 'Inter', sans-serif;
    text-align: left;
}

.logout-btn:hover {
    background: #ef4444;
    color: #fff;
    border-color: #ef4444;
}

.logout-btn i {
    font-size: 0.9rem;
    width: 16px;
    text-align: center;
}

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

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    border: 1px solid var(--border);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.card-title { font-size: 1rem; font-weight: 600; color: var(--text); }

/* KPI Cards */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.kpi-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 16px;
}

.kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: #fff;
}

.kpi-icon.blue { background: var(--info); }
.kpi-icon.green { background: var(--success); }
.kpi-icon.yellow { background: var(--warning); }
.kpi-icon.red { background: var(--danger); }
.kpi-icon.purple { background: var(--primary); }

.kpi-info h3 { font-size: 1.5rem; font-weight: 700; color: var(--text); margin: 0; }
.kpi-info p { font-size: 0.8rem; color: var(--text-light); margin: 0; }

/* Tables */
.table-container { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

th {
    background: #f8fafc;
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--text-light);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

tr:hover { background: #f8fafc; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: #f8fafc; }
.btn-sm { padding: 4px 10px; font-size: 0.8rem; }

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success { background: #dcfce7; color: #166534; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #dbeafe; color: #1e40af; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 6px; color: var(--text); }

.form-control,
.form-select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text);
    background-color: #fff;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: 'Inter', sans-serif;
    height: 42px;
}

.form-control::placeholder { color: #9ca3af; }
.form-control:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

textarea.form-control {
    height: auto;
    resize: vertical;
}

.form-select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2364748b' d='M1.4 0l4.6 4.6L10.6 0 12 1.4 6 7.4 0 1.4z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 40px;
    cursor: pointer;
}

.form-select option {
    padding: 8px;
    color: var(--text);
}

.input-validation-error,
.form-control.input-validation-error,
.form-select.input-validation-error {
    border-color: var(--danger);
}

.field-validation-error { color: var(--danger); font-size: 0.8rem; }
.text-danger { color: var(--danger) !important; }

.form-check-box {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.form-check-box input { accent-color: var(--primary); width: 18px; height: 18px; cursor: pointer; }

/* Grid */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-title { font-size: 1.5rem; font-weight: 700; color: var(--text); }
.page-subtitle { font-size: 0.875rem; color: var(--text-light); }

/* Empty State */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-light);
}

.empty-state i { font-size: 3rem; margin-bottom: 16px; opacity: 0.3; }
.empty-state h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--text); }

/* Responsive */
@media (max-width: 768px) {
    .sidebar { width: 70px; }
    .sidebar .sidebar-brand span,
    .sidebar .nav-item span { display: none; }
    .main-content { margin-left: 70px; }
    .kpi-grid { grid-template-columns: repeat(2, 1fr); }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ===== DataTables theme ===== */
.dataTables_wrapper {
    font-size: 0.875rem;
    color: var(--text);
}

.dataTables_wrapper .dataTables_length,
.dataTables_wrapper .dataTables_filter,
.dataTables_wrapper .dataTables_info,
.dataTables_wrapper .dataTables_paginate {
    color: var(--text-light);
    margin: 10px 0;
}

.table.data-table {
    border-collapse: separate;
    border-spacing: 0;
}

.dataTables_wrapper .dataTables_filter {
    float: right;
    text-align: right;
    margin-bottom: 12px;
}

.dataTables_wrapper .dataTables_filter input {
    height: 36px;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.875rem;
    font-family: 'Inter', sans-serif;
    color: var(--text);
    margin-left: 8px;
    min-width: 220px;
}

.dataTables_wrapper .dataTables_filter input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.dataTables_wrapper .dataTables_length select {
    height: 32px;
    padding: 4px 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    color: var(--text);
    margin: 0 6px;
}

.dataTables_wrapper .dataTables_length select:focus {
    outline: none;
    border-color: var(--primary);
}

.dataTables_wrapper .dataTables_paginate .paginate_button {
    border: 1px solid var(--border) !important;
    border-radius: 6px;
    margin-left: 4px;
    padding: 6px 12px !important;
    color: var(--text) !important;
    background: #fff !important;
    cursor: pointer;
}

.dataTables_wrapper .dataTables_paginate .paginate_button:hover {
    background: #f8fafc !important;
    color: var(--primary) !important;
}

.dataTables_wrapper .dataTables_paginate .paginate_button.current {
    background: var(--primary) !important;
    color: #fff !important;
    border-color: var(--primary) !important;
}

.dataTables_wrapper .dataTables_paginate .paginate_button.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.dataTables_wrapper table.dataTable thead th {
    border-bottom: 2px solid var(--border);
}

.dataTables_wrapper table.dataTable.no-footer {
    border-bottom: 1px solid var(--border);
}

.dataTables_wrapper .dataTable > thead > tr > th.sorting_asc,
.dataTables_wrapper .dataTable > thead > tr > th.sorting_desc {
    color: var(--primary);
}

/* ===== Print (hide app chrome for invoice/printable views) ===== */
@media print {
    .sidebar,
    .top-bar,
    .menu-toggle,
    .logout-form,
    .user-menu {
        display: none !important;
    }

    .main-content {
        margin-left: 0 !important;
        padding: 0 !important;
    }

    .content-area {
        padding: 0 !important;
    }

    .app-container {
        display: block !important;
    }

    .card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
}