/* ===========================================================================
   KEYBOARD REFLEX — prompt, keycaps and a live keyboard
   =========================================================================== */

.kb-stage {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 16px 18px;
}

.kb-prompt {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  min-height: 0;
}

.kb-group {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--game-accent);
  min-height: 1.2em;
}

.kb-action {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--arena-ink);
  min-height: 1.15em;
  text-shadow: 0 0 40px var(--game-glow);
}

.kb-action.enter {
  animation: kb-enter 0.38s var(--ease);
}

@keyframes kb-enter {
  from { opacity: 0; transform: translateY(10px) scale(0.97); filter: blur(4px); }
  to   { opacity: 1; transform: none; filter: none; }
}

/* --- Keycaps for the target combo --- */
.kb-combo {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 62px;
  flex-wrap: wrap;
  justify-content: center;
}

.kb-cap {
  min-width: 58px;
  height: 56px;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--arena-ink);
  background: linear-gradient(180deg, #2B3048, #1A1E31);
  border-radius: 12px;
  box-shadow:
    0 5px 0 #0A0C16,
    0 10px 24px -6px rgba(0, 0, 0, 0.8),
    inset 0 1px 0 rgba(255, 255, 255, 0.14),
    0 0 0 1px color-mix(in srgb, var(--game-accent) 35%, transparent);
  animation: kb-cap-in 0.32s var(--ease-spring) both;
}

.kb-cap:nth-child(3) { animation-delay: 0.04s; }
.kb-cap:nth-child(5) { animation-delay: 0.08s; }

@keyframes kb-cap-in {
  from { opacity: 0; transform: translateY(-10px) scale(0.9); }
  to { opacity: 1; transform: none; }
}

.kb-cap--hidden {
  color: var(--arena-ink-3);
  background: rgba(255, 255, 255, 0.03);
  box-shadow: inset 0 0 0 1px var(--arena-line-strong);
  border: 1px dashed var(--arena-line-strong);
}

.kb-plus {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--arena-ink-3);
}

.kb-combo.done .kb-cap {
  color: #05060D;
  background: var(--arena-good);
  transform: translateY(5px);
  box-shadow: 0 0 0 #0A0C16, 0 0 30px rgba(59, 240, 160, 0.6);
  transition: all 0.12s var(--ease);
}

.kb-combo.hinted .kb-cap {
  box-shadow: 0 5px 0 #0A0C16, inset 0 1px 0 rgba(255, 255, 255, 0.14), 0 0 0 1px var(--arena-warn);
}

.kb-combo.shake {
  animation: kb-shake 0.36s var(--ease);
}

@keyframes kb-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(7px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(3px); }
}

/* --- Round timer --- */
.kb-timer {
  width: min(320px, 70%);
  height: 4px;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.07);
  overflow: hidden;
}

.kb-timer__fill {
  display: block;
  height: 100%;
  transform-origin: left;
  transform: scaleX(0);
  background: var(--arena-good);
  box-shadow: 0 0 12px currentColor;
}

.kb-timer__fill[data-tone="warn"] { background: var(--arena-warn); }
.kb-timer__fill[data-tone="bad"] { background: var(--arena-bad); }

.kb-verdict {
  min-height: 1.5em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--arena-ink-2);
}

.kb-verdict.hit { color: var(--arena-good); }
.kb-verdict.miss { color: var(--arena-bad); }

/* ===========================
   The live keyboard
   =========================== */
.kb-board {
  --u: clamp(20px, 3.3vw, 38px);
  --gap: calc(var(--u) * 0.12);
  display: flex;
  align-items: flex-end;
  gap: calc(var(--u) * 0.5);
  padding: calc(var(--u) * 0.35);
  border-radius: calc(var(--u) * 0.4);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  box-shadow: inset 0 0 0 1px var(--arena-line), 0 30px 60px -30px rgba(0, 0, 0, 0.9);
  flex-shrink: 0;
}

.kb-main,
.kb-nav {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.kb-row {
  display: flex;
  gap: var(--gap);
}

.kb-row--fn {
  margin-bottom: calc(var(--u) * 0.18);
}

.kb-row--fn .kb-key,
.kb-nav .kb-row:first-child .kb-key {
  height: calc(var(--u) * 0.72);
}

.kb-row--spacer {
  height: calc(var(--u) * 0.72 + var(--u) * 0.18 - var(--gap));
}

.kb-key {
  width: calc(var(--u) * var(--w) + var(--gap) * (var(--w) - 1));
  height: var(--u);
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  padding: calc(var(--u) * 0.1) calc(var(--u) * 0.14);
  font-family: var(--font-mono);
  font-size: calc(var(--u) * 0.32);
  font-weight: 600;
  line-height: 1;
  color: var(--arena-ink-3);
  background: linear-gradient(180deg, #1C2033, #141727);
  border-radius: calc(var(--u) * 0.16);
  box-shadow: 0 2px 0 #07080F, inset 0 1px 0 rgba(255, 255, 255, 0.06);
  transition: background 0.18s var(--ease), color 0.18s var(--ease), transform 0.06s linear,
              box-shadow 0.18s var(--ease);
  flex-shrink: 0;
}

.kb-key--word {
  font-size: calc(var(--u) * 0.26);
}

.kb-key--gap {
  background: none;
  box-shadow: none;
}

.kb-key.target {
  color: var(--arena-ink);
  background: linear-gradient(180deg, color-mix(in srgb, var(--game-accent) 40%, #1C2033), color-mix(in srgb, var(--game-accent) 25%, #141727));
  box-shadow: 0 2px 0 #07080F, 0 0 0 1px var(--game-accent), 0 0 18px var(--game-glow);
  animation: kb-target 1.2s ease-in-out infinite;
}

@keyframes kb-target {
  50% { box-shadow: 0 2px 0 #07080F, 0 0 0 1px var(--game-accent), 0 0 30px var(--game-glow); }
}

.kb-key.down {
  color: #05060D;
  background: #EEF1FF;
  transform: translateY(2px);
  box-shadow: 0 0 0 #07080F, 0 0 20px rgba(255, 255, 255, 0.5);
  transition-duration: 0.04s;
}

.kb-key.hit {
  color: #05060D;
  background: var(--arena-good);
  box-shadow: 0 0 22px rgba(59, 240, 160, 0.7);
}

.kb-key.wrong {
  animation: kb-wrong 0.5s var(--ease);
}

@keyframes kb-wrong {
  0%, 60% { background: var(--arena-bad); color: #fff; box-shadow: 0 0 22px rgba(255, 84, 104, 0.7); }
  100% { }
}

/* ===========================
   Quiz (touch)
   =========================== */
.kb-choices {
  display: none;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  width: min(520px, 100%);
}

.kb-stage[data-mode="quiz"] .kb-choices { display: grid; }
.kb-stage[data-mode="quiz"] .kb-board { display: none; }
.kb-stage[data-mode="quiz"] .kb-combo { display: none; }

.kb-choice {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 5px;
  padding: 10px 8px;
  border-radius: var(--r-md);
  background: var(--arena-chip);
  border: 1px solid var(--arena-line-strong);
  touch-action: manipulation;
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease), opacity var(--t-base) var(--ease);
}

.kb-choice:active { transform: scale(0.96); }

.kb-choice .kb-cap {
  min-width: 0;
  height: 34px;
  padding: 0 9px;
  font-size: 0.82rem;
  border-radius: 8px;
  box-shadow: 0 3px 0 #0A0C16, inset 0 1px 0 rgba(255, 255, 255, 0.14);
  animation: none;
}

.kb-choice .kb-plus { font-size: 0.8rem; }

.kb-choice.right {
  border-color: var(--arena-good);
  background: rgba(59, 240, 160, 0.14);
  box-shadow: 0 0 30px rgba(59, 240, 160, 0.35);
}

.kb-choice.wrong {
  border-color: var(--arena-bad);
  background: rgba(255, 84, 104, 0.1);
  opacity: 0.55;
  animation: kb-shake 0.36s var(--ease);
}

/* Narrow desktop windows: the keyboard keeps its proportions but shrinks. */
@media (max-width: 760px) {
  .kb-board { display: none; }
  .kb-cap { min-width: 48px; height: 48px; font-size: 1rem; padding: 0 12px; }
}