:root {
  color-scheme: light dark;
  --bg: #f6f6f4;
  --card: #ffffff;
  --text: #1a1a1a;
  --muted: #5c5c5c;
  --border: #d8d8d4;
  --accent: #1db954;
  --error: #b00020;
  --code-bg: #ececea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --card: #1e1e1e;
    --text: #f0f0f0;
    --muted: #a8a8a8;
    --border: #333333;
    --code-bg: #2a2a2a;
  }
}

* { box-sizing: border-box; }

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

.page {
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

header h1 { margin: 0 0 0.5rem; font-size: 1.75rem; font-weight: 600; }
.lede { margin: 0 0 1.5rem; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.card h2 { margin: 0 0 0.75rem; font-size: 1.1rem; font-weight: 600; }
.card p { margin: 0 0 0.75rem; }
.hint { color: var(--muted); font-size: 0.9rem; }

.copy-list { margin: 0 0 0.75rem; }
.copy-list > div { margin-bottom: 0.75rem; }
.copy-list dt { font-size: 0.85rem; font-weight: 600; margin-bottom: 0.25rem; }
.copy-list dd { margin: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }

code {
  background: var(--code-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9rem;
  word-break: break-all;
}

a { color: var(--accent); }

form { display: flex; flex-direction: column; gap: 0.75rem; }
label { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.9rem; font-weight: 500; }

input {
  font: inherit;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
}

button { font: inherit; cursor: pointer; }

.primary {
  margin-top: 0.25rem;
  padding: 0.65rem 1rem;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

.copy-btn {
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.8rem;
}

.error { color: var(--error); font-size: 0.9rem; margin: 0.5rem 0 0; }

#qr-output { display: flex; justify-content: center; padding: 1rem 0; }
#qr-output canvas { display: block; image-rendering: pixelated; }

.security ul { margin: 0; padding-left: 1.25rem; color: var(--muted); font-size: 0.9rem; }
.security li + li { margin-top: 0.35rem; }