:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #666666;
  --border: #cccccc;
  --accent: #2563eb;
  --error: #b91c1c;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e5e5e5;
    --bg: #121212;
    --muted: #999999;
    --border: #444444;
    --accent: #60a5fa;
    --error: #f87171;
  }
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--fg);
  background: var(--bg);
  margin: 0;
  padding: 2rem 1rem;
}

main {
  max-width: 640px;
  margin: 0 auto;
}

h1 {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 1.5rem 0;
}

label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

input {
  padding: 0.55rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9rem;
  width: 100%;
}

button {
  padding: 0.6rem;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: #ffffff;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 0.75rem;
}

button:hover {
  filter: brightness(1.05);
}

#result {
  margin-top: 1.5rem;
  overflow-wrap: anywhere;
}

.status {
  color: var(--muted);
}

.error {
  color: var(--error);
}

.preview-text {
  white-space: pre-wrap;
  word-break: break-word;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1rem;
  max-height: 60vh;
  overflow: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
}

.preview-image {
  max-width: 100%;
  max-height: 60vh;
  border-radius: 4px;
  display: block;
}

.preview-unsupported {
  color: var(--muted);
}

.download-button {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--accent);
  border-radius: 4px;
  color: var(--accent);
  text-decoration: none;
}

.download-button:hover {
  background: var(--accent);
  color: #ffffff;
}

.share-link {
  width: 100%;
  padding: 0.55rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  margin: 0.5rem 0;
}