:root {
    --bg: #f3f6fb;
    --card: #ffffff;
    --text: #1a1f36;
    --muted: #6b7280;
    --primary: #2563eb;
    --primary-soft: #dbeafe;
    --border: #e5e7eb;
    --success: #059669;
    --danger: #dc2626;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.app {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: #111827;
    color: #fff;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.brand {
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.4;
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar a {
    color: #d1d5db;
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 8px;
}

.sidebar a:hover,
.sidebar a.active {
    background: rgba(255,255,255,0.08);
    color: #fff;
}

.sidebar-footer {
    margin-top: auto;
}

.content {
    padding: 24px;
}

.page-header h1 {
    margin: 0 0 20px;
    font-size: 1.75rem;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
}

.stat {
    background: var(--bg);
    border-radius: 10px;
    padding: 16px;
}

.stat-label {
    color: var(--muted);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 1.6rem;
    font-weight: 700;
}

.toolbar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

input, select {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font: inherit;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 10px;
    border-bottom: 1px solid var(--border);
    text-align: right;
}

th {
    background: #f9fafb;
    font-size: 0.9rem;
    color: var(--muted);
}

tr:hover td {
    background: #fafafa;
}

a.link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 0.8rem;
    background: var(--primary-soft);
    color: var(--primary);
}

.badge.customer { background: #dcfce7; color: var(--success); }
.badge.supplier { background: #fee2e2; color: var(--danger); }

.amount { white-space: nowrap; font-variant-numeric: tabular-nums; }
.amount.positive { color: var(--danger); }
.amount.negative { color: var(--success); }

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.meta-list {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 8px 16px;
}

.meta-list dt { color: var(--muted); }
.meta-list dd { margin: 0; }

@media (max-width: 900px) {
    .app { grid-template-columns: 1fr; }
    .sidebar { padding: 16px; }
    .sidebar nav { flex-direction: row; flex-wrap: wrap; }
    .grid-2 { grid-template-columns: 1fr; }
}