:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0a66ff;
  --accent-text: #ffffff;
  --border: #d2d2d7;
  --error: #c62828;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --card: #1c1c1f;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #4d8dff;
    --border: #3a3a3f;
    --error: #ff6b6b;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 20px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 2px 16px rgb(0 0 0 / 0.08);
}

h1 { margin: 0 0 20px; font-size: 1.5rem; line-height: 1.25; }
.stack { display: flex; flex-direction: column; gap: 14px; }
.muted { color: var(--muted); font-size: 0.9rem; }
.error { color: var(--error); margin: 0; }
.error:empty { display: none; }
.big { font-size: 1.25rem; font-weight: 600; }
code { word-break: break-all; }

label { display: flex; flex-direction: column; gap: 6px; font-weight: 500; }

input[type="text"], input[type="password"], textarea {
  width: 100%;
  padding: 12px;
  font: inherit;
  color: inherit;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.picker { position: relative; align-items: center; text-align: center; }
.picker input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.picker__button {
  display: block;
  width: 100%;
  padding: 28px 16px;
  border: 2px dashed var(--accent);
  border-radius: var(--radius);
  color: var(--accent);
  font-weight: 600;
}
.picker__hint { color: var(--muted); font-size: 0.9rem; font-weight: 400; }

button {
  width: 100%;
  padding: 14px;
  font: inherit;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  border: 0;
  border-radius: var(--radius);
  cursor: pointer;
}
button:disabled { opacity: 0.4; cursor: default; }
button.secondary { color: var(--accent); background: transparent; border: 1px solid var(--accent); }

progress { width: 100%; height: 14px; accent-color: var(--accent); }