:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --good: #16a34a;
    --bad: #dc2626;
    --border: #e2e8f0;
    --bg: #f8fafc;
    --text: #1e293b;
    --muted: #64748b;
}

* { box-sizing: border-box; }

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

.topbar {
    background: #fff;
    border-bottom: 1px solid var(--border);
}
.topbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.brand { font-weight: 700; text-decoration: none; color: var(--text); font-size: 1.1rem; }
.topbar nav a {
    margin-left: 16px;
    text-decoration: none;
    color: var(--primary);
    font-weight: 600;
}

.container { max-width: 1100px; margin: 0 auto; padding: 24px 20px 60px; }

h1 { margin-top: 0; }

.flash {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 18px;
    font-weight: 600;
}
.flash-success { background: #dcfce7; color: #166534; }
.flash-error { background: #fee2e2; color: #991b1b; }
.flash-warning { background: #fef3c7; color: #92400e; }

.search-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.search-bar input[type=text], .search-bar select {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
}
.search-bar input[type=text] { flex: 1; min-width: 220px; }

button, .btn-primary, .btn-secondary, .btn-cancel, .btn-danger, .btn-clear {
    cursor: pointer;
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
}
.btn-primary, button[type=submit] { background: var(--primary); color: #fff; }
.btn-primary:hover, button[type=submit]:hover { background: var(--primary-dark); }
.btn-secondary { background: #e2e8f0; color: var(--text); }
.btn-cancel { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-danger { background: #fee2e2; color: var(--danger); }
.btn-clear { background: transparent; color: var(--muted); text-decoration: underline; padding: 10px 4px; }

.table-wrap { overflow-x: auto; background: #fff; border-radius: 10px; border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; }
thead { background: #f1f5f9; }
th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.92rem; }
.sort-link { color: var(--text); text-decoration: none; font-weight: 700; white-space: nowrap; }
.sort-link:hover { color: var(--primary); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: #f8fafc; }

.actions a { margin-right: 10px; color: var(--primary); text-decoration: none; font-weight: 600; }
.link-danger { color: var(--danger) !important; }

.balance-due { color: var(--bad); font-weight: 700; }
.balance-clear { color: var(--good); font-weight: 700; }

.empty-state { color: var(--muted); padding: 20px 0; }

.card-form, .panel {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-grid .span-2 { grid-column: span 2; }

label { display: flex; flex-direction: column; font-size: 0.88rem; font-weight: 600; color: var(--muted); gap: 6px; }
input, select {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--text);
}
input[readonly] { background: #f1f5f9; color: var(--muted); }

.hint { color: var(--muted); font-size: 0.85rem; margin-top: -8px; }

.custom-fee-table { width: 100%; border-collapse: collapse; margin-bottom: 10px; }
.custom-fee-table td { padding: 6px 4px; border: none; }
.custom-fee-table th { text-align: left; padding: 6px 4px; font-size: 0.85rem; color: var(--muted); }
.btn-remove-row { background: transparent; color: var(--danger); padding: 4px 8px; }

.form-actions { display: flex; gap: 10px; margin-top: 20px; }

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}
.subtitle { color: var(--muted); margin: 4px 0 0; }
.detail-actions { display: flex; gap: 10px; }

.cards-row { display: flex; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.stat-card {
    flex: 1;
    min-width: 160px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.stat-label { color: var(--muted); font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em; }
.stat-value { font-size: 1.6rem; font-weight: 700; }
.stat-good { color: var(--good); }
.stat-bad { color: var(--bad); }

.two-col { display: grid; grid-template-columns: 1.2fr 1fr; gap: 20px; }
@media (max-width: 800px) { .two-col { grid-template-columns: 1fr; } .form-grid { grid-template-columns: 1fr; } .form-grid .span-2 { grid-column: span 1; } }

.kv-table { width: 100%; border-collapse: collapse; }
.kv-table td { padding: 8px 4px; border-bottom: 1px solid var(--border); font-size: 0.92rem; }
.kv-table td:last-child { text-align: right; font-variant-numeric: tabular-nums; }
.kv-table .subtotal td { font-weight: 700; border-top: 2px solid var(--border); }
.kv-table .grand-total td { font-weight: 800; font-size: 1.05rem; color: var(--primary); border-top: 2px solid var(--text); }

.payment-form { display: flex; flex-direction: column; gap: 14px; }

.footer { text-align: center; color: var(--muted); font-size: 0.85rem; padding: 20px 0 40px; }

.sub-heading {
    font-size: 0.95rem;
    color: var(--muted);
    margin: 20px 0 8px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}
.sub-heading:first-of-type { border-top: none; padding-top: 0; }

.insights-heading {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 2px solid var(--border);
}

.bar-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}
.bar-label {
    width: 110px;
    flex-shrink: 0;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.bar-track {
    flex: 1;
    background: #eef2f7;
    border-radius: 6px;
    height: 18px;
    overflow: hidden;
}
.bar-fill {
    display: block;
    height: 100%;
    background: var(--primary);
    border-radius: 6px;
    min-width: 2px;
}
.bar-value {
    width: 110px;
    flex-shrink: 0;
    text-align: right;
    font-size: 0.85rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.nav-user { margin-left: 16px; color: var(--muted); font-weight: 600; font-size: 0.9rem; }

.role-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-left: 6px;
}
.role-admin { background: #dbeafe; color: #1e40af; }
.role-viewer { background: #fef3c7; color: #92400e; }
.role-delete { background: #fee2e2; color: #991b1b; }

.checkbox-label {
    flex-direction: row !important;
    align-items: flex-start;
    gap: 8px !important;
    font-weight: 600;
    color: var(--text) !important;
}
.checkbox-label input[type="checkbox"] { margin-top: 3px; }
.checkbox-label .hint { display: block; font-weight: 400; margin-top: 2px; }

.auth-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.auth-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.04);
}
.auth-card h1 { font-size: 1.2rem; margin: 0 0 4px; }
.auth-card h2 { font-size: 1.05rem; margin: 0 0 16px; color: var(--muted); font-weight: 600; }
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-form button { margin-top: 4px; }