:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666666;
  --border: #d0d0d0;
  --accent: #2b2b2b;
  --warning-bg: #fff4e5;
  --warning-fg: #7a4a00;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --fg: #eaeaea;
    --muted: #9a9a9a;
    --border: #3a3b3f;
    --accent: #eaeaea;
    --warning-bg: #3a2e12;
    --warning-fg: #f0c674;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  display: flex;
  justify-content: center;
  padding: 48px 16px;
}

main {
  width: 100%;
  max-width: 480px;
}

h1 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.naming-guide {
  font-size: 0.85rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  margin-bottom: 24px;
  line-height: 1.5;
}

.naming-guide code {
  border: 1px solid var(--border);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.85em;
}

form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
}

fieldset.field {
  border: none;
  padding: 0;
  margin: 0;
}

legend {
  font-size: 0.9rem;
  padding: 0;
  margin-bottom: 4px;
}

fieldset label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: normal;
  margin-bottom: 4px;
}

input[type="file"],
input[type="url"],
select {
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 10px;
}

.hint {
  font-size: 0.82rem;
  color: var(--muted);
  min-height: 1.2em;
}

.warning {
  font-size: 0.82rem;
  color: var(--warning-fg);
  background: var(--warning-bg);
  border-radius: 6px;
  padding: 8px 10px;
}

.hidden {
  display: none;
}

button {
  font: inherit;
  font-weight: 600;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 6px;
  padding: 11px 16px;
  cursor: pointer;
}

button:disabled {
  opacity: 0.6;
  cursor: default;
}

.status {
  font-size: 0.85rem;
  min-height: 1.2em;
}

.status.error {
  color: #c0392b;
}

.status.success {
  color: #2e7d32;
}

.validator-link,
.validator-link:link,
.validator-link:visited {
  display: block;
  text-align: center;
  margin-top: 28px;
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: underline;
}

.validator-link:hover {
  color: var(--fg);
}