:root {
    --primary: #1e3a5f;
    --accent: #d4a017;
    --bg: #f4f6f9;
    --card: #ffffff;
    --text: #223;
    --muted: #667;
    --success: #1e8e5a;
    --danger: #c0392b;
    --border: #e2e6ec;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}
a { text-decoration: none; color: inherit; }

/* Auth pages */
body.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1e3a5f, #0f1f33);
}
.auth-box {
    background: var(--card);
    padding: 40px;
    border-radius: 10px;
    width: 360px;
    box-shadow: 0 10px 40px rgba(0,0,0,.3);
}
.auth-box h1 { margin: 0 0 4px; color: var(--primary); }
.auth-box .subtitle { color: var(--muted); margin-top: 0; margin-bottom: 20px; }
.auth-box label { display: block; margin: 12px 0 4px; font-size: 14px; color: var(--muted); }
.auth-box input {
    width: 100%; padding: 10px; border: 1px solid var(--border);
    border-radius: 6px; font-size: 14px;
}
.auth-box button {
    margin-top: 20px; width: 100%; padding: 12px; background: var(--primary);
    color: #fff; border: none; border-radius: 6px; font-size: 15px; cursor: pointer;
}
.auth-box button:hover { background: #16304f; }
.auth-box .hint { font-size: 12px; color: var(--muted); margin-top: 16px; text-align: center; }
.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 10px; font-size: 14px; }
.alert-error { background: #fdecea; color: var(--danger); }
.alert-success { background: #e9f8f0; color: var(--success); }

/* Layout */
.layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 230px; background: var(--primary); color: #fff;
    display: flex; flex-direction: column; padding: 20px 0; flex-shrink: 0;
}
.brand { font-size: 20px; font-weight: bold; padding: 0 20px 20px; letter-spacing: 1px; }
.brand span { color: var(--accent); }
.sidebar nav { flex: 1; }
.sidebar nav a {
    display: block; padding: 12px 20px; color: #cdd6e3; font-size: 14px;
    border-left: 3px solid transparent;
}
.sidebar nav a:hover { background: rgba(255,255,255,.08); color: #fff; }
.sidebar nav a.active { background: rgba(255,255,255,.12); color: #fff; border-left-color: var(--accent); }
.sidebar-footer { padding: 15px 20px; border-top: 1px solid rgba(255,255,255,.15); font-size: 13px; }
.sidebar-footer .user { margin-bottom: 8px; color: #cdd6e3; }
.sidebar-footer .logout { color: var(--accent); }

.content { flex: 1; padding: 28px 34px; overflow-x: auto; }
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 22px; }
.page-header h1 { margin: 0; font-size: 24px; color: var(--primary); }

.btn {
    display: inline-block; padding: 9px 16px; border-radius: 6px; border: none;
    background: var(--primary); color: #fff; cursor: pointer; font-size: 14px;
}
.btn:hover { background: #16304f; }
.btn-accent { background: var(--accent); color: #23231a; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 5px 10px; font-size: 12px; }

.cards-row { display: flex; gap: 18px; margin-bottom: 24px; flex-wrap: wrap; }
.stat-card {
    background: var(--card); border-radius: 10px; padding: 18px 22px; flex: 1; min-width: 160px;
    box-shadow: 0 2px 8px rgba(0,0,0,.05); border-left: 4px solid var(--primary);
}
.stat-card .num { font-size: 26px; font-weight: bold; color: var(--primary); }
.stat-card .label { font-size: 13px; color: var(--muted); margin-top: 4px; }
.stat-card.accent { border-left-color: var(--accent); }
.stat-card.danger { border-left-color: var(--danger); }
.stat-card.success { border-left-color: var(--success); }

.card { background: var(--card); border-radius: 10px; padding: 22px; box-shadow: 0 2px 8px rgba(0,0,0,.05); margin-bottom: 20px; }

table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { background: #f0f3f8; color: var(--muted); font-weight: 600; position: sticky; top: 0; }
tr:hover td { background: #fafbfd; }

.badge { padding: 3px 9px; border-radius: 12px; font-size: 11.5px; font-weight: 600; }
.badge-paid { background: #e9f8f0; color: var(--success); }
.badge-unpaid, .badge-incomplete { background: #fdecea; color: var(--danger); }
.badge-default { background: #eef1f6; color: var(--muted); }

.toolbar { display: flex; gap: 10px; margin-bottom: 18px; flex-wrap: wrap; align-items: center; }
.toolbar input[type=text], .toolbar select {
    padding: 9px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;
}
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 20px; }
.form-grid.full { grid-template-columns: 1fr; }
.form-group label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 9px 11px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;
}
.form-actions { margin-top: 20px; display: flex; gap: 10px; }
.actions-cell { white-space: nowrap; }
.actions-cell a { margin-right: 6px; }
.pagination { display: flex; gap: 6px; margin-top: 16px; }
.pagination a, .pagination span {
    padding: 6px 12px; border-radius: 6px; border: 1px solid var(--border); font-size: 13px;
}
.pagination a.active { background: var(--primary); color: #fff; }
.empty-state { text-align: center; padding: 40px; color: var(--muted); }