body { font-family: system-ui, sans-serif; margin: 0; background: #f5f7fb; color: #222; }
.topbar { display:flex; justify-content:space-between; align-items:center; padding: 12px 18px; background:#fff; border-bottom:1px solid #ddd; }
.topbar nav a { margin-left: 12px; text-decoration:none; color:#333; }
.container { max-width: 1100px; margin: 24px auto; padding: 0 16px; }
.card { background:#fff; border:1px solid #ddd; border-radius: 12px; padding:16px; margin-bottom: 16px; }
.card.small { max-width: 420px; }
.grid { display:grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.big { font-size: 2rem; margin: 0; }
table { width:100%; border-collapse: collapse; }
th, td { text-align:left; border-bottom:1px solid #eee; padding:8px; font-size: 14px; }
code { white-space: pre-wrap; word-break: break-word; font-size: 12px; }
input, button { padding: 8px; margin-top: 6px; width: 100%; box-sizing: border-box; }
button { cursor: pointer; }
.flash { padding: 10px; border-radius: 8px; margin-bottom: 12px; }
.flash.success { background: #e7f7e7; }
.flash.error { background: #ffe8e8; }
.hint { color:#666; font-size: 13px; }
@media (max-width: 800px) {
  .grid { grid-template-columns: 1fr; }
}