:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --accent: #2d6cdf;
  --border: #d0d0d0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #f0f0f0;
    --accent: #6ea8ff;
    --border: #3a3a3a;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 16px;
  padding-bottom: calc(16px + env(safe-area-inset-bottom));
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, 'Hiragino Sans', sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

main {
  max-width: 480px;
  margin: 0 auto;
}

h1 {
  font-size: 1.3rem;
}

.notice {
  font-size: 0.85rem;
  color: var(--fg);
  opacity: 0.75;
  border-left: 3px solid var(--accent);
  padding-left: 10px;
}

.step {
  margin: 20px 0;
}

h2 {
  font-size: 1rem;
  margin-bottom: 8px;
}

select,
input[type="file"] {
  width: 100%;
  min-height: 44px;
  font-size: 1rem;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
}

button {
  min-height: 44px;
  min-width: 44px;
  padding: 8px 16px;
  margin-right: 8px;
  margin-bottom: 8px;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
}

button:disabled {
  opacity: 0.4;
}

.status {
  font-size: 0.9rem;
  white-space: pre-wrap;
}