:root {
    --bg: #f5f6f8;
    --fg: #1f2328;
    --muted: #57606a;
    --border: #d0d7de;
    --accent: #0969da;
    --danger: #cf222e;
    --success: #1a7f37;
    --warn: #9a6700;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, Segoe UI, Helvetica, Arial, sans-serif; background: var(--bg); color: var(--fg); }
.topbar { display: flex; justify-content: space-between; align-items: center; padding: 12px 20px; background: #fff; border-bottom: 1px solid var(--border); }
.topbar .brand { font-weight: 700; color: var(--fg); text-decoration: none; }
.topbar nav a { margin-left: 16px; color: var(--accent); text-decoration: none; }
.topbar nav .who { margin-left: 16px; color: var(--muted); }
main { max-width: 960px; margin: 24px auto; padding: 0 16px; }

h1 { margin-top: 0; }
.hint { color: var(--muted); }

.flash { padding: 10px 14px; border-radius: 6px; margin: 12px 0; border: 1px solid; }
.flash-error   { background: #ffebe9; border-color: #ffcecb; color: var(--danger); }
.flash-success { background: #dafbe1; border-color: #aceebb; color: var(--success); }
.flash-warn    { background: #fff8c5; border-color: #eac54f; color: var(--warn); }

.auth-box { max-width: 360px; margin: 40px auto; background: #fff; padding: 24px; border: 1px solid var(--border); border-radius: 8px; }
.auth-box label { display: block; margin: 10px 0; }
.auth-box input { width: 100%; padding: 8px; border: 1px solid var(--border); border-radius: 6px; }
button, .btn { display: inline-block; padding: 8px 14px; border: 1px solid var(--border); border-radius: 6px; background: #fff; color: var(--fg); text-decoration: none; cursor: pointer; }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-secondary { background: #fff; }

.canvas-list { list-style: none; padding: 0; }
.canvas-list li { background: #fff; padding: 16px; margin: 10px 0; border: 1px solid var(--border); border-radius: 8px; }
.canvas-list h3 { margin: 0 0 6px; }

.card { background: #fff; padding: 20px; border: 1px solid var(--border); border-radius: 8px; }
.card dl { display: grid; grid-template-columns: max-content 1fr; gap: 4px 14px; }
.card dt { color: var(--muted); }
.warn { color: var(--warn); }

table.history { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
table.history th, table.history td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: left; font-size: 14px; }
table.history tr.row-failed td { background: #fff5f5; }
table.history tr.row-detail pre { margin: 0; white-space: pre-wrap; font-size: 12px; color: var(--muted); }
.pager { margin-top: 16px; display: flex; gap: 12px; }
code { background: #eff1f3; padding: 1px 5px; border-radius: 4px; font-size: 90%; }

.btn-sm { padding: 4px 8px; font-size: 13px; }
.badge { display: inline-block; padding: 2px 7px; border-radius: 10px; font-size: 12px; font-weight: 600; }
.badge-green { background: #dafbe1; color: var(--success); }
.badge-gray  { background: #f0f0f0; color: var(--muted); }
.badge-blue  { background: #ddf4ff; color: var(--accent); }
.admin-form { max-width: 600px; background: #fff; padding: 24px; border: 1px solid var(--border); border-radius: 8px; margin-top: 24px; }
.admin-form label { display: block; margin: 10px 0 4px; }
.admin-form input[type=text], .admin-form input[type=number], .admin-form textarea { width: 100%; padding: 8px; border: 1px solid var(--border); border-radius: 6px; }
.admin-form textarea { min-height: 80px; }