*{box-sizing:border-box}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;margin:0;background:#fff;color:#111}
.container{max-width:1100px;margin:24px auto;padding:0 16px}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid #eee;background:#fff;position:sticky;top:0}
.topbar .brand{font-weight:700}
.topbar nav a{margin-left:12px;color:#111;text-decoration:none}
h1,h2,h3{margin:12px 0}
.btn{display:inline-block;padding:8px 12px;border:1px solid #333;border-radius:6px;text-decoration:none;color:#111;background:#f8f8f8;margin-right:8px}
.btn.primary{background:#111;color:#fff}
.btn.danger{background:#b91c1c;color:#fff;border-color:#b91c1c}
.table{width:100%;border-collapse:collapse;margin-top:12px}
.table th,.table td{border-bottom:1px solid #eee;padding:8px;text-align:left}
label{display:block;margin-top:10px;margin-bottom:4px}
input,select,textarea{width:100%;padding:8px;border:1px solid #ccc;border-radius:6px}
.row{display:flex;gap:10px;align-items:center;margin-top:10px}
.flash{background:#ecfdf5;color:#065f46;padding:10px;border:1px solid #a7f3d0;border-radius:6px;margin:10px 0}
.error{background:#fef2f2;color:#991b1b;padding:10px;border:1px solid #fecaca;border-radius:6px;margin:10px 0}
.mb{margin-bottom:12px}
.mt{margin-top:18px}
.note{font-size:12px;color:#666;margin:6px 0}
.tabs{display:flex;gap:8px;margin:12px 0}
.tab-btn{padding:6px 10px;border:1px solid #ccc;border-radius:6px;background:#f8f8f8;cursor:pointer}
.tab-btn.active{background:#111;color:#fff;border-color:#111}
.tab-pane{display:none}
.tab-pane.active{display:block}
.grid3{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:8px 0}
@media (max-width:900px){.grid3{grid-template-columns:repeat(2,minmax(0,1fr))}}