:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1c1e21;
  --muted: #5f6672;
  --border: #d9dde3;
  --accent: #2563eb;
  --on-accent: #ffffff;
  --log-bg: #11151c;
  --log-text: #d6e2f0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --card: #181c22;
    --text: #e8eaed;
    --muted: #9aa3af;
    --border: #2b313a;
    --accent: #60a5fa;
    --on-accent: #0b1220;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 16px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
}

main, header { max-width: 720px; margin: 0 auto; }

header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 16px; }
h1 { font-size: 1.25rem; margin: 0; }
h2 { font-size: 1rem; margin: 0 0 12px; }
nav a { margin-right: 12px; color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

label { display: block; font-size: 0.875rem; color: var(--muted); margin: 8px 0 4px; }

input, textarea {
  width: 100%;
  padding: 8px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}

textarea { font-family: ui-monospace, Menlo, Consolas, monospace; min-height: 80px; }

button {
  margin: 8px 8px 0 0;
  padding: 8px 14px;
  font: inherit;
  color: var(--on-accent);
  background: var(--accent);
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}

dl { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 4px 12px; }
dt { color: var(--muted); }
dd { margin: 0; word-break: break-all; }

pre, #log {
  margin: 8px 0 0;
  padding: 10px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.8125rem;
  white-space: pre-wrap;
  word-break: break-word;
  border-radius: 6px;
}

pre { background: var(--bg); border: 1px solid var(--border); }
#log { background: var(--log-bg); color: var(--log-text); max-height: 320px; overflow-y: auto; }

#link-result[hidden] { display: none; }
#link-url { word-break: break-all; }