/* ============================================================
   Brain Train · 3-minute system-design rapid-fire
   ============================================================ */

.rapid-page {
  max-width: 820px;
  margin: 1.5rem auto 5rem;
  padding: 0 1rem;
}

/* ---- Intro state ---- */
.rapid-intro {
  text-align: center;
  padding: 2.5rem 1.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-md);
}
.rapid-eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
.rapid-intro h1 {
  margin: 0.5rem 0 0.6rem;
  font-size: 1.9rem;
  letter-spacing: -0.01em;
}
.rapid-intro .lead {
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 1.2rem;
  font-size: 1rem;
  line-height: 1.5;
}
.rapid-rules {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 0.6rem;
  margin: 0.8rem 0 1.4rem;
}
.rapid-rule {
  background: var(--bg-alt);
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
}
.rapid-rule strong { color: var(--text); font-weight: 800; }
.rapid-start-btn {
  font-size: 1.05rem;
  padding: 0.7rem 1.8rem;
  font-weight: 800;
}

/* ---- Play state ---- */
.rapid-stage {
  display: flex; flex-direction: column;
  gap: 1rem;
}
.rapid-hud {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}
.rapid-timer {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-align: center;
  color: var(--text);
  min-width: 100px;
}
.rapid-timer.warn  { color: var(--warn); }
.rapid-timer.crit  { color: var(--danger); animation: rapid-pulse 0.6s ease-in-out infinite; }
@keyframes rapid-pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.08); }
}
.rapid-stat {
  display: flex; flex-direction: column;
  font-size: 0.78rem;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
}
.rapid-stat.right  { text-align: right; }
.rapid-stat .num {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--text);
  margin-top: 0.15rem;
  font-family: var(--font-mono);
}
.rapid-stat .num.ok   { color: var(--success); }
.rapid-stat .num.miss { color: var(--danger); }

.rapid-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.3rem 1.3rem 1rem;
  box-shadow: var(--shadow-md);
  transition: transform 120ms ease, opacity 120ms ease;
}
.rapid-card.is-right { animation: rapid-flash-ok 350ms ease-out; }
.rapid-card.is-wrong { animation: rapid-flash-no 350ms ease-out; }
@keyframes rapid-flash-ok {
  0%   { box-shadow: 0 0 0 0 var(--success); }
  60%  { box-shadow: 0 0 0 6px color-mix(in oklab, var(--success) 30%, transparent); }
  100% { box-shadow: var(--shadow-md); }
}
@keyframes rapid-flash-no {
  0%   { box-shadow: 0 0 0 0 var(--danger); }
  60%  { box-shadow: 0 0 0 6px color-mix(in oklab, var(--danger) 30%, transparent); }
  100% { box-shadow: var(--shadow-md); }
}
.rapid-meta {
  display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
  margin-bottom: 0.6rem;
}
.rapid-track-badge {
  font-size: 0.74rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  color: white;
  background: var(--accent);
}
.rapid-level-pill {
  font-size: 0.74rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  color: var(--accent);
  border: 1px solid color-mix(in oklab, var(--accent) 40%, var(--border));
  background: color-mix(in oklab, var(--accent) 8%, transparent);
}
.rapid-q-title {
  margin: 0.4rem 0 1rem;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
}
.rapid-opts {
  list-style: none;
  margin: 0; padding: 0;
  display: flex; flex-direction: column;
  gap: 0.45rem;
}
.rapid-opts button {
  width: 100%;
  text-align: left;
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.7rem 0.85rem;
  border: 1.5px solid var(--border);
  background: var(--bg);
  border-radius: 10px;
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  line-height: 1.4;
  cursor: pointer;
  transition: border-color 80ms, background 80ms, transform 80ms;
}
.rapid-opts button:hover {
  border-color: var(--accent);
  background: var(--bg-alt);
}
.rapid-opts button .letter {
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-soft);
  flex-shrink: 0;
  width: 1.4em;
}
.rapid-opts button.is-correct {
  border-color: var(--success);
  background: var(--success-bg);
  color: var(--success-text);
}
.rapid-opts button.is-wrong {
  border-color: var(--danger);
  background: var(--danger-bg);
  color: var(--danger-text);
}
.rapid-opts button:disabled { cursor: default; }
.rapid-opts button.is-correct .letter { color: var(--success-text); }
.rapid-opts button.is-wrong   .letter { color: var(--danger-text); }
/* Transient "you clicked this" state before the API response paints the verdict */
.rapid-opts button.is-picked {
  border-color: var(--accent);
  background: color-mix(in oklab, var(--accent) 10%, var(--bg));
  color: var(--text);
}

/* Verdict pill prepended to the card after the user answers */
.rapid-verdict {
  margin: -0.4rem 0 0.7rem;
  padding: 0.4rem 0.7rem;
  border-radius: 8px;
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}
.rapid-verdict.is-ok {
  background: var(--success-bg);
  color: var(--success-text);
}
.rapid-verdict.is-no {
  background: var(--danger-bg);
  color: var(--danger-text);
}

.rapid-skip-row {
  display: flex; justify-content: flex-end;
  margin-top: 0.7rem;
}
.rapid-skip {
  background: transparent;
  border: 0;
  color: var(--text-soft);
  cursor: pointer;
  font: inherit;
  font-size: 0.85rem;
  padding: 0.3rem 0.55rem;
  border-radius: 6px;
}
.rapid-skip:hover { background: var(--bg-alt); color: var(--text); }

/* ---- Finish state ---- */
.rapid-finish {
  text-align: center;
  padding: 2rem 1.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-md);
}
.rapid-finish h2 {
  margin: 0.3rem 0 0.5rem;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
}
.rapid-bigscore {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  margin: 0.8rem 0 0.4rem;
  font-family: var(--font-mono);
}
.rapid-bigscore .big {
  font-size: 3.4rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--accent);
}
.rapid-bigscore .small { color: var(--text-soft); font-size: 1.1rem; font-weight: 700; }
.rapid-finish .verdict {
  color: var(--text-muted);
  max-width: 480px;
  margin: 0.4rem auto 1.4rem;
  font-size: 0.98rem;
  line-height: 1.5;
}
.rapid-finish-breakdown {
  display: flex; justify-content: center; gap: 1.2rem;
  margin-bottom: 1.4rem;
  flex-wrap: wrap;
}
.rapid-finish-breakdown div {
  display: flex; flex-direction: column;
  color: var(--text-soft);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
}
.rapid-finish-breakdown div .num {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--text);
  margin-top: 0.2rem;
  font-family: var(--font-mono);
}
.rapid-finish-breakdown div .num.ok   { color: var(--success); }
.rapid-finish-breakdown div .num.miss { color: var(--danger); }
.rapid-finish-actions {
  display: flex; justify-content: center; flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.4rem;
}