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

:root {
    --bg: #f5f5f5;
    --surface: #ffffff;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}

header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header h1 {
    font-size: 18px;
    font-weight: 600;
}

header .sync-status {
    font-size: 12px;
    color: var(--text-muted);
}

nav {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    display: flex;
    gap: 0;
}

nav a {
    padding: 10px 16px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all 0.15s;
}

nav a:hover, nav a.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px 24px;
}

.filters {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
    display: flex;
    gap: 12px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.filter-group label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-muted);
}

.filter-group select,
.filter-group input {
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    background: var(--surface);
}

.btn {
    padding: 7px 16px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

thead th {
    background: #f8fafc;
    padding: 10px 12px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    border-bottom: 1px solid var(--border);
}

tbody td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

tbody tr:hover {
    background: #f8fafc;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 500;
}

.badge-ok { background: #dcfce7; color: var(--success); }
.badge-sin_stock { background: #fef2f2; color: var(--danger); }
.badge-stock_bajo { background: #fefce8; color: var(--warning); }
.badge-sin_ventas { background: #f1f5f9; color: var(--text-muted); }

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.view { display: none; }
.view.active { display: block; }

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 16px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
}

.stat-card .label {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.stat-card .value {
    font-size: 24px;
    font-weight: 700;
}

.text-right { text-align: right; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }