:root {
    --bg: #f4f6fb;
    --text: #1d2433;
    --panel: #ffffff;
    --line: #d8deea;
    --brand: #0c5ecf;
    --brand-dark: #07439a;
    --danger: #b63333;
    --success: #1f8a44;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, sans-serif;
    background: var(--bg);
    color: var(--text);
}

a { color: var(--brand); text-decoration: none; }

.sidebar {
    position: fixed;
    width: 230px;
    top: 0;
    left: 0;
    bottom: 0;
    padding: 24px;
    background: #0f1728;
    color: #fff;
}
.sidebar h2 { margin-top: 0; font-size: 20px; }
.sidebar a {
    display: block;
    padding: 10px 12px;
    margin-bottom: 8px;
    border-radius: 8px;
    color: #cbd5e8;
}
.sidebar a.active,
.sidebar a:hover { background: #1d2c4d; color: #fff; }

.main { margin-left: 230px; padding: 24px; }
.topbar { margin-bottom: 16px; }
.topbar h1 { margin: 0; }
.topbar p { margin: 4px 0 0; color: #53617d; }

.card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 16px;
    margin-bottom: 16px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(4, minmax(160px, 1fr));
    gap: 12px;
}
.cards.compact { grid-template-columns: repeat(2, minmax(200px, 1fr)); margin: 16px 0; }

.stat-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 14px;
}
.stat-card h3 { margin: 0; font-size: 13px; color: #55607a; }
.stat-card p { margin: 8px 0 0; font-size: 22px; font-weight: 700; }

.form-grid { display: grid; gap: 8px; }
.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}
label { font-size: 13px; color: #55607a; }
input, select, textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #c8d0e0;
    border-radius: 8px;
    background: #fff;
}

.btn {
    border: 0;
    background: var(--brand);
    color: #fff;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    display: inline-block;
}
.btn:hover { background: var(--brand-dark); }
.btn.secondary { background: #e7ecf8; color: #24314e; }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: #932828; }

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

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { border-bottom: 1px solid #e3e8f2; text-align: left; padding: 10px; }
th { color: #53617d; font-weight: 600; }

.inline { display: inline-block; }
.link-btn {
    border: 0;
    background: transparent;
    color: var(--danger);
    cursor: pointer;
    padding: 0;
}

.alert {
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 12px;
    font-size: 14px;
}
.alert.error { background: #fdeced; color: #8e1f2d; }
.alert.success { background: #e8f8ee; color: #146833; }

.auth-wrap {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}
.auth-wrap .card {
    width: 100%;
    max-width: 460px;
}

.line-item {
    display: grid;
    grid-template-columns: 1fr 120px 48px;
    gap: 8px;
    margin-bottom: 8px;
}

.summary-box {
    background: #f7f9ff;
    border: 1px solid #dae4f7;
    border-radius: 10px;
    padding: 10px 12px;
}
.summary-box p { margin: 6px 0; }

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}
.badge.success,
.badge.paid { background: #e8f8ee; color: #146833; }
.badge.partial { background: #fff4dd; color: #9f5a00; }
.badge.unpaid,
.badge.danger { background: #fdeced; color: #8e1f2d; }

.admin-main {
    max-width: 1300px;
    margin: 0 auto;
    padding: 24px;
}
.admin-topbar h1 { margin: 0; }
.admin-topbar p { margin: 4px 0 18px; color: #53617d; }

.admin-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.admin-toolbar h2 { margin: 0 0 4px; }
.admin-toolbar p { margin: 0; color: #53617d; }

.admin-grid {
    align-items: start;
}

.admin-table-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

@media (max-width: 900px) {
    .sidebar { position: static; width: 100%; }
    .main { margin-left: 0; }
    .cards, .grid-2 { grid-template-columns: 1fr; }
    .line-item { grid-template-columns: 1fr; }
}