:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --ink: #0f172a;
  --ink-2: #475569;
  --line: #e2e8f0;
  --accent: #1e293b;
  --accent-hover: #0f172a;
  --ok: #16a34a;
  --err: #dc2626;
  --hint: #94a3b8;
  --focus: #2563eb;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.4;
}

body {
  min-height: 100vh;
  display: grid;
  place-items: start center;
  padding: 24px 16px 48px;
}

.card {
  width: 100%;
  max-width: 560px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px 28px 24px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

header h1 {
  margin: 0 0 4px;
  font-size: 22px;
  letter-spacing: -0.01em;
}

header .sub {
  margin: 0 0 24px;
  color: var(--ink-2);
  font-size: 14px;
}

form { display: grid; gap: 16px; }

fieldset.type {
  border: 0;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

fieldset.type legend {
  font-weight: 600;
  font-size: 13px;
  color: var(--ink-2);
  padding: 0;
  margin-bottom: 4px;
}

.opt {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}

.opt:has(input:checked) {
  border-color: var(--accent);
  background: #f8fafc;
}

.opt input { accent-color: var(--accent); }
.opt span { display: grid; gap: 2px; }
.opt strong { font-weight: 600; }
.opt em { font-style: normal; color: var(--ink-2); font-size: 13px; }

label {
  display: grid;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
}

label .hint {
  font-weight: 400;
  color: var(--hint);
  font-size: 12px;
}

input, textarea {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  transition: border-color .15s, box-shadow .15s;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

textarea { resize: vertical; min-height: 64px; }

.row { display: grid; gap: 16px; grid-template-columns: 1fr 1fr; }

@media (max-width: 480px) {
  .row { grid-template-columns: 1fr; }
}

details.advanced-toggle {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0;
}

details.advanced-toggle > summary {
  cursor: pointer;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--ink-2);
  user-select: none;
  list-style: none;
}

details.advanced-toggle > summary::-webkit-details-marker { display: none; }
details.advanced-toggle > summary::before {
  content: "▸ ";
  display: inline-block;
  margin-right: 4px;
  transition: transform .15s;
}
details.advanced-toggle[open] > summary::before {
  transform: rotate(90deg);
}

details.advanced-toggle[open] > summary {
  border-bottom: 1px solid var(--line);
}

details.advanced-toggle > label {
  padding: 12px 14px;
  display: grid;
  gap: 6px;
}

button[type="submit"] {
  margin-top: 4px;
  padding: 12px 16px;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
}

button[type="submit"]:hover { background: var(--accent-hover); }
button[type="submit"]:disabled { opacity: .6; cursor: not-allowed; }

.status {
  font-size: 14px;
  padding: 0;
  margin: 0;
}

.status.ok {
  padding: 12px 14px;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: var(--ok);
  border-radius: 8px;
}

.status.err {
  padding: 12px 14px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--err);
  border-radius: 8px;
  white-space: pre-wrap;
}

.status ul { margin: 6px 0 0 18px; padding: 0; }
.status code {
  background: rgba(15,23,42,0.06);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
}
.status .muted {
  color: var(--ink-2);
  font-size: 13px;
}