:root {
  --bg: #0a0a0a;
  --bg-elev: #111;
  --bg-frame: #0d0d0d;
  --ink: #e6e6e6;
  --ink-dim: #9a9a9a;
  --muted: #5a5a5a;
  --line: #1f1f1f;
  --line-strong: #2a2a2a;
  --accent: #d9ff4a;
  --accent-dim: rgba(217, 255, 74, 0.18);
  --green: #6dd58c;
  --red: #e96565;
  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  padding: 2.5rem 1rem 0.5rem;
}

.wordmark {
  font-family: var(--mono);
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  font-weight: 500;
  letter-spacing: -0.04em;
  color: var(--ink);
  line-height: 1;
}

.kicker {
  margin-top: 0.5rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: lowercase;
}

main {
  flex: 1;
  width: 100%;
  max-width: 580px;
  margin: 0 auto;
  padding: 1.75rem 1.25rem 2rem;
}

footer {
  padding: 1.5rem 1rem 1.75rem;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
}
footer .brand { color: var(--ink-dim); }

.screen { display: none; }
.screen.active { display: block; animation: fadein 0.35s ease; }

@keyframes fadein {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hidden { display: none !important; }

/* intro */
.explainer {
  font-size: 1rem;
  color: var(--ink);
  margin-bottom: 1rem;
  max-width: 50ch;
}
.explainer em { font-style: italic; color: var(--ink); }
.explainer.subtle {
  color: var(--ink-dim);
  font-size: 0.85rem;
  margin-top: 1.5rem;
}
.explainer.subtle a {
  color: var(--ink-dim);
  border-bottom: 1px dotted var(--muted);
  text-decoration: none;
}
.explainer.subtle a:hover { color: var(--accent); border-color: var(--accent); }

.kbd {
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 1px 6px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  color: var(--ink);
  background: var(--bg-elev);
}

.notes-panel {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  font-size: 0.85rem;
  color: var(--ink-dim);
}
.notes-panel p { margin-bottom: 0.6rem; }
.notes-panel p:last-child { margin-bottom: 0; }

/* buttons */
.primary {
  display: inline-block;
  margin-top: 1.25rem;
  padding: 0.7rem 1.4rem;
  font-family: var(--mono);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  color: var(--bg);
  background: var(--accent);
  border: none;
  border-radius: 2px;
  cursor: pointer;
  transition: filter 0.15s ease;
}
.primary:hover { filter: brightness(1.08); }
.primary:active { transform: translateY(1px); }

.ghost {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.55rem 1rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-dim);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  cursor: pointer;
}
.ghost:hover { color: var(--ink); border-color: var(--ink-dim); }

/* game */
.round-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: lowercase;
  margin-bottom: 1.5rem;
}
.round-meta .round-num { color: var(--ink); }
.round-meta .round-sep { margin: 0 0.25em; color: var(--line-strong); }

.question {
  font-family: var(--sans);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 1.5rem;
  min-height: 2.5em;
  line-height: 1.4;
}

.response-frame {
  border: 1px solid var(--line);
  background: var(--bg-frame);
  padding: 0.85rem 1rem 1rem;
  margin-bottom: 1.5rem;
}
.response-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  margin-bottom: 0.55rem;
  text-transform: uppercase;
}
.response {
  font-family: var(--mono);
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink);
  white-space: pre-wrap;
  min-height: 3em;
}
.response .cursor {
  display: inline-block;
  width: 0.5em;
  height: 1em;
  background: var(--ink-dim);
  vertical-align: text-bottom;
  margin-left: 1px;
  animation: blink 0.9s steps(1) infinite;
}
@keyframes blink {
  50% { opacity: 0; }
}

.choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.choice {
  font-family: var(--mono);
  font-size: 1rem;
  letter-spacing: 0.04em;
  padding: 0.95rem;
  color: var(--ink);
  background: var(--bg-elev);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}
.choice:hover:not(:disabled) {
  background: #161616;
  border-color: var(--ink-dim);
}
.choice:disabled { cursor: default; opacity: 0.4; }
.choice.picked { border-color: var(--accent); color: var(--accent); }
.choice.correct { border-color: var(--green); color: var(--green); }
.choice.wrong { border-color: var(--red); color: var(--red); }

.verdict {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-dim);
  min-height: 1.2em;
  margin-bottom: 1rem;
}
.verdict.right { color: var(--green); }
.verdict.wrong { color: var(--red); }

.trail {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}
.trail-dot {
  width: 14px;
  height: 14px;
  border: 1px solid var(--line-strong);
  border-radius: 1px;
}
.trail-dot.right { background: var(--green); border-color: var(--green); }
.trail-dot.wrong { background: var(--red); border-color: var(--red); }

/* reveal */
.reveal-title {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}
.reveal-rule {
  font-family: var(--sans);
  font-size: 1.35rem;
  line-height: 1.35;
  color: var(--ink);
  margin-bottom: 1.5rem;
}
.reveal-rule .hl {
  background: var(--accent-dim);
  padding: 0 4px;
  color: var(--accent);
  border-radius: 2px;
}
.reveal-meta {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-dim);
  margin-bottom: 1.5rem;
}
.reveal-meta span { color: var(--ink); }
.reveal-grid {
  font-family: var(--mono);
  font-size: 1.5rem;
  letter-spacing: 0.2em;
  margin-bottom: 1rem;
}
.reveal-result {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--ink);
  margin-bottom: 1.75rem;
}
.reveal-result .caught { color: var(--accent); }

/* share */
.share-box {
  border: 1px solid var(--line);
  background: var(--bg-frame);
  padding: 0.85rem;
  margin-bottom: 1rem;
}
.share-box textarea {
  width: 100%;
  min-height: 5.5em;
  background: transparent;
  border: none;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.5;
  resize: none;
  outline: none;
}
.copy-feedback {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--green);
  min-height: 1em;
  margin-top: 0.4rem;
}

/* responsive */
@media (max-width: 480px) {
  main { padding: 1.25rem 1rem 1.5rem; }
  .question { font-size: 1.05rem; }
  .response { font-size: 0.88rem; }
  .choice { padding: 0.85rem; font-size: 0.95rem; }
}