:root {
  color-scheme: light dark;
  --bg: #101418;
  --fg: #e8ecef;
  --muted: #9aa7b0;
  --accent: #4cc2ff;
  --card: #1a2027;
  --border: #2c3640;
  --danger: #ff7a7a;
  --ok: #7ddf9a;
  font-size: 17px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa;
    --fg: #14202a;
    --muted: #51616e;
    --accent: #0069a8;
    --card: #ffffff;
    --border: #ccd6dd;
    --danger: #b3261e;
    --ok: #1b7d40;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  max-width: 60rem;
  padding: 1rem 1.25rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 0.5rem 1rem;
  z-index: 10;
}

.skip-link:focus { left: 0.5rem; top: 0.5rem; }

h1 { font-size: 1.6rem; margin-bottom: 0.25rem; }

.tagline { color: var(--muted); margin-top: 0; }

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

.field { margin: 1rem 0; }

label { display: block; font-weight: 600; margin-bottom: 0.25rem; }

.hint { color: var(--muted); font-size: 0.9rem; margin: 0.25rem 0 0.5rem; }

textarea, select {
  width: 100%;
  font: inherit;
  color: var(--fg);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.55rem 0.7rem;
}

textarea { resize: vertical; }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: end;
}

.field-inline { margin: 0; }
.field-inline select { width: auto; }

button {
  font: inherit;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  border: none;
  border-radius: 6px;
  padding: 0.55rem 1.1rem;
  cursor: pointer;
}

button:hover { filter: brightness(1.1); }

button:focus-visible, textarea:focus-visible, select:focus-visible, a:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

button[disabled] { opacity: 0.55; cursor: wait; }

button.secondary {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
}

button[aria-pressed="true"] {
  background: var(--danger);
  color: #fff;
}

.status { min-height: 1.5rem; margin: 1rem 0 0; color: var(--ok); font-weight: 600; }
.errors { color: var(--danger); font-weight: 600; margin: 0.5rem 0; }

.prompt-history {
  margin: 0.5rem 0 0;
  padding-left: 1.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.variant-list { list-style: none; padding: 0; margin: 1rem 0 0; }

.variant {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
}

.variant h3 { margin: 0 0 0.2rem; font-size: 1.1rem; }

.variant .desc { margin: 0 0 0.7rem; color: var(--muted); }

.variant .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.variant details { margin-top: 0.8rem; }

.variant summary { cursor: pointer; font-weight: 600; }

.variant pre {
  overflow-x: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem;
  font-size: 0.85rem;
  tab-size: 2;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

footer { margin-top: 3rem; color: var(--muted); font-size: 0.9rem; }

@media (prefers-reduced-motion: no-preference) {
  button { transition: filter 120ms ease; }
}