:root {
    --bg: #f4f6f8;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --line: #e5e7eb;
    --primary: #1f6feb;
    --primary-dark: #1754b8;
    --danger: #dc2626;
    --success: #15803d;
    --warning: #b45309;
    --sidebar: #111827;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.app { display: flex; min-height: 100vh; }
.sidebar { width: 250px; background: var(--sidebar); color: #fff; flex-shrink: 0; position: fixed; left: 0; top: 0; bottom: 0; overflow-y: auto; }
.brand { padding: 20px 18px; font-weight: 700; font-size: 18px; border-bottom: 1px solid rgba(255,255,255,.1); }
.nav { padding: 10px; }
.nav-link { display: block; padding: 10px 12px; color: #d1d5db; border-radius: 8px; margin-bottom: 3px; }
.nav-link:hover, .nav-link.active { background: rgba(255,255,255,.1); color: #fff; text-decoration: none; }
.main { margin-left: 250px; width: calc(100% - 250px); }
.topbar { height: 64px; background: var(--card); border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 16px; padding: 0 20px; position: sticky; top: 0; z-index: 10; }
.page-title { font-size: 20px; font-weight: 700; flex: 1; }
.user-box { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 14px; }
.menu-btn { display: none; border: 0; background: transparent; font-size: 24px; cursor: pointer; }
.content { padding: 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; margin-bottom: 16px; box-shadow: 0 1px 2px rgba(0,0,0,.03); }
.card h1, .card h2, .card h3 { margin-top: 0; }
.grid { display: grid; gap: 16px; }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.stat { padding: 16px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.stat .num { font-size: 28px; font-weight: 700; margin-top: 8px; }
.stat .label { color: var(--muted); }
.table-wrap { overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: #f9fafb; color: #374151; font-size: 13px; }
tr:last-child td { border-bottom: 0; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.toolbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: end; margin-bottom: 12px; }
label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 10px; }
input, select, textarea { width: 100%; padding: 9px 10px; border: 1px solid #d1d5db; border-radius: 8px; font: inherit; background: #fff; }
textarea { min-height: 90px; resize: vertical; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.form-grid .wide { grid-column: 1 / -1; }
.form-actions { display: flex; gap: 10px; margin-top: 12px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--text); cursor: pointer; font-size: 14px; text-decoration: none; }
.btn:hover { text-decoration: none; background: #f9fafb; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.danger { color: #fff; background: var(--danger); border-color: var(--danger); }
.btn.small { padding: 6px 9px; font-size: 13px; }
.btn.full { width: 100%; }
.alert { padding: 12px; border-radius: 8px; margin-bottom: 12px; }
.alert-success { background: #dcfce7; color: #166534; }
.alert-error { background: #fee2e2; color: #991b1b; }
.alert-warning { background: #fef3c7; color: #92400e; }
.badge { display: inline-block; padding: 3px 7px; border-radius: 999px; background: #eef2ff; color: #3730a3; font-size: 12px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.login-card { width: 100%; max-width: 380px; background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 24px; box-shadow: 0 12px 30px rgba(0,0,0,.08); }
.login-card h1 { margin: 0 0 4px; font-size: 24px; }
.login-card p { margin-top: 0; color: var(--muted); }
.print-note { display: none; }
@media print {
    .sidebar, .topbar, .toolbar, .filters, .actions, .btn { display: none !important; }
    .main { margin: 0; width: 100%; }
    .content { padding: 0; }
    .card, .table-wrap { border: 0; box-shadow: none; }
    .print-note { display: block; }
}
@media (max-width: 980px) {
    .sidebar { transform: translateX(-100%); transition: transform .2s; z-index: 100; }
    .sidebar.open { transform: translateX(0); }
    .main { margin-left: 0; width: 100%; }
    .menu-btn { display: block; }
    .grid.cols-4, .grid.cols-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .form-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
    .content { padding: 12px; }
    .grid.cols-4, .grid.cols-3 { grid-template-columns: 1fr; }
    .user-box span { display: none; }
}