:root {
  color-scheme: light dark;
  --bg: #0f1115;
  --card: #171a21;
  --border: #2a2f3a;
  --fg: #e8ecf1;
  --muted: #9aa3b2;
  --accent: #6aa9ff;
  --accent-fg: #0b1220;
  --ok: #4ade80;
  --warn: #fbbf24;
  --err: #f87171;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6f8;
    --card: #ffffff;
    --border: #dee2e8;
    --fg: #14181f;
    --muted: #5b6472;
    --accent: #2563eb;
    --accent-fg: #ffffff;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue',
    Arial, 'Noto Sans JP', sans-serif;
  line-height: 1.6;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.01em;
}

header .sub {
  margin: 0 0 24px;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  margin-bottom: 16px;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 17px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card h2 .num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-fg);
  font-size: 13px;
  font-weight: 700;
}

.card p {
  margin: 4px 0 12px;
  color: var(--muted);
}

.card .hint {
  font-size: 13px;
  color: var(--muted);
}

.row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin: 8px 0;
}

button {
  font: inherit;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

button:hover:not(:disabled) {
  border-color: var(--accent);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
  font-weight: 600;
}

button.primary:hover:not(:disabled) {
  filter: brightness(1.08);
}

input[type='text'],
input[type='file'] {
  font: inherit;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--fg);
  flex: 1;
  min-width: 140px;
}

code {
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 0.92em;
  background: color-mix(in srgb, var(--fg) 8%, transparent);
  padding: 1px 6px;
  border-radius: 4px;
}

.status {
  font-size: 13px;
  color: var(--muted);
}

.status.ok {
  color: var(--ok);
}
.status.warn {
  color: var(--warn);
}
.status.err {
  color: var(--err);
}

.compat ul {
  list-style: none;
  padding: 0;
  margin: 4px 0 0;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  color: var(--muted);
}

.progress {
  height: 8px;
  background: color-mix(in srgb, var(--fg) 8%, transparent);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 10px;
}

#progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.15s;
}

.logs pre {
  margin: 0;
  max-height: 240px;
  overflow: auto;
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 12.5px;
  background: color-mix(in srgb, var(--fg) 5%, transparent);
  padding: 10px 12px;
  border-radius: 8px;
  white-space: pre-wrap;
  word-break: break-all;
}

details {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
}

details summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 13px;
  padding: 4px 0;
}

footer {
  margin-top: 24px;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

footer a {
  color: var(--muted);
}