:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --ink: #0f172a;
  --muted: #5b6473;
  --line: #e5e7eb;
  --accent: #2563eb;
  --accent2: #22c55e;
  --ok: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
  --radius: 16px;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell,
    Arial;
  background: var(--bg);
  color: var(--ink);
}
.wrap {
  max-width: 1000px;
  margin: 32px auto;
  padding: 0 16px;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}
h1 {
  font-size: clamp(22px, 3vw, 28px);
  margin: 0;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
}
.section {
  margin: 16px 0;
  border: 1px dashed var(--line);
  border-radius: 14px;
  padding: 14px;
}
.section h2 {
  font-size: 18px;
  margin: 0 0 6px 0;
}
.hint {
  color: var(--muted);
  font-size: 13px;
}
.grid {
  display: grid;
  gap: 12px;
}
@media (min-width: 880px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}
label.opt {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  background: #fafbff;
}
label.opt.error {
  border: 1px solid var(--danger);
}
input[type="radio"],
input[type="checkbox"] {
  accent-color: var(--accent);
}
.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}
button {
  appearance: none;
  border: none;
  padding: 12px 16px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
}
.primary {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff;
}
.ghost {
  background: #eef2ff;
  color: #1f2953;
  border: 1px solid var(--line);
}
.inline {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
input[type="number"],
input[type="text"] {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  min-width: 120px;
}
input[type="number"].error,
input[type="text"].error {
  border: 1px solid var(--danger);
  background-color: rgba(220, 38, 38, 0.05);
}

.error-message {
  color: var(--danger);
  font-size: 12px;
  font-weight: 500;
  margin-top: 10px;
  min-height: 16px;
}
.res {
  margin-top: 18px;
  padding: 18px;
  background: #f0f7ff;
  border-left: 6px solid var(--accent);
  border-radius: 10px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  padding: 8px 12px;
  border-radius: 999px;
  margin: 6px 0;
}
.b1 {
  background: rgba(22, 163, 74, 0.12);
  color: var(--ok);
  border: 1px solid rgba(22, 163, 74, 0.35);
}
.b2 {
  background: rgba(217, 119, 6, 0.12);
  color: var(--warn);
  border: 1px solid rgba(217, 119, 6, 0.35);
}
.b3 {
  background: rgba(220, 38, 38, 0.12);
  color: var(--danger);
  border: 1px solid rgba(220, 38, 38, 0.35);
}
.list {
  margin: 6px 0 0 18px;
}
.muted {
  color: var(--muted);
}
footer {
  margin: 22px 0;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}