:root {
  --font: "Plus Jakarta Sans", Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ink: #102033;
  --muted: #52677c;
  --panel: rgba(255, 255, 255, .92);
  --orange: #f97316;
  --gold: #facc15;
  --teal: #0f766e;
  --blue: #38bdf8;
  --danger: #dc2626;
  --progress: 0;
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #172033;
  color: var(--ink);
  font-family: var(--font);
}

button {
  font: inherit;
  touch-action: manipulation;
}

.forge-app {
  position: relative;
  width: 100%;
  height: 100svh;
  min-height: 560px;
  overflow: hidden;
  background:
    radial-gradient(circle at 14% 12%, rgba(255, 255, 255, .76), transparent 16%),
    radial-gradient(circle at 82% 18%, rgba(250, 204, 21, .42), transparent 18%),
    linear-gradient(180deg, #9be8ff 0%, #dff7ff 42%, #f7b267 70%, #71451f 100%);
  isolation: isolate;
  user-select: none;
}

.asset-loader,
.game-overlay {
  position: absolute;
  inset: 0;
  z-index: 70;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background:
    linear-gradient(180deg, rgba(15, 23, 42, .34), rgba(15, 23, 42, .58)),
    radial-gradient(circle at 50% 18%, rgba(255, 255, 255, .38), transparent 36%);
  backdrop-filter: blur(10px);
}

.forge-app.is-loading .asset-loader,
.game-overlay.is-visible {
  display: flex;
}

.rotate-overlay {
  position: absolute;
  inset: 0;
  z-index: 85;
  display: none;
  align-items: center;
  justify-content: center;
  padding: max(18px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) max(18px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));
  background:
    radial-gradient(circle at 26% 18%, rgba(255,255,255,.86), transparent 22%),
    linear-gradient(145deg, rgba(23,32,51,.94), rgba(15,118,110,.9) 48%, rgba(113,63,18,.92));
  backdrop-filter: blur(12px);
}

.rotate-card {
  width: min(430px, 100%);
  padding: 24px 22px;
  border: 1px solid rgba(255,255,255,.7);
  border-radius: 8px;
  background: rgba(255,255,255,.95);
  box-shadow: 0 28px 76px rgba(15,23,42,.34);
  color: var(--ink);
  text-align: center;
}

.rotate-card::before {
  content: "";
  width: 82px;
  height: 54px;
  display: block;
  margin: 0 auto 14px;
  border: 8px solid var(--teal);
  border-radius: 16px;
  background:
    radial-gradient(circle at 74% 50%, var(--gold) 0 7px, transparent 8px),
    linear-gradient(90deg, #f8fafc, #dbeafe);
  box-shadow: inset 0 0 0 4px rgba(255,255,255,.72), 0 14px 28px rgba(15,118,110,.18);
  transform: rotate(90deg);
  animation: rotateCue 1.45s ease-in-out infinite;
}

.rotate-card strong {
  display: block;
  font-size: clamp(24px, 8vw, 36px);
  line-height: 1.05;
}

.rotate-card p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
  font-weight: 800;
  line-height: 1.45;
}

.asset-loader {
  z-index: 90;
  background:
    radial-gradient(circle at 22% 18%, rgba(255, 255, 255, .92), transparent 18%),
    radial-gradient(circle at 78% 25%, rgba(250, 204, 21, .38), transparent 24%),
    linear-gradient(135deg, #172033 0%, #0f766e 48%, #713f12 100%);
}

.loader-card,
.overlay-card {
  width: min(620px, 100%);
  border: 1px solid rgba(255, 255, 255, .66);
  border-radius: 8px;
  background: rgba(255, 255, 255, .95);
  box-shadow: 0 28px 84px rgba(15, 23, 42, .32);
  padding: clamp(20px, 5vw, 34px);
  text-align: center;
}

.brand-loader {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(255,255,255,.98), rgba(255,247,237,.94));
}

.brand-loader::before {
  content: "";
  position: absolute;
  inset: -45% -18% auto;
  height: 140px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .82), transparent);
  transform: rotate(-8deg) translateX(-55%);
  animation: loaderSweep 2.2s ease-in-out infinite;
  pointer-events: none;
}

.loader-eyebrow,
.overlay-kicker,
.target-label,
.hud-item span,
.forge-meter-label,
.game-kicker {
  color: #0f766e;
  font-size: 11px;
  font-weight: 950;
  letter-spacing: .1em;
  line-height: 1.2;
  text-transform: uppercase;
}

.loader-eyebrow {
  margin: 0 0 12px;
}

.loader-brand {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  gap: 0;
  width: 100%;
  max-width: 100%;
  margin: 0;
  overflow: visible;
  white-space: nowrap;
  font-size: clamp(28px, 10vw, 58px);
  font-weight: 950;
  line-height: 1.04;
}

.loader-brand span {
  flex: 0 0 auto;
  display: inline-block;
  background: linear-gradient(135deg, #102033 0%, #0f766e 52%, #f97316 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: 0;
  transform: translateX(-28px) translateY(8px) rotate(-5deg);
  animation: brandLetterIn .68s cubic-bezier(.18, .86, .25, 1.18) forwards;
  animation-delay: calc(var(--i) * .075s);
}

.loader-card p,
.overlay-card p {
  margin: 12px 0 0;
  color: var(--muted);
  font-weight: 750;
  line-height: 1.55;
}

.loader-bar {
  height: 10px;
  margin-top: 18px;
  overflow: hidden;
  border-radius: 999px;
  background: #fde6c8;
}

.loader-bar span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #0f766e, #38bdf8, #f97316);
  transition: width .25s ease;
}

.game-topbar {
  position: absolute;
  top: max(12px, env(safe-area-inset-top));
  left: max(12px, env(safe-area-inset-left));
  right: max(12px, env(safe-area-inset-right));
  z-index: 24;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 66px;
  padding: 10px 12px;
  border: 1px solid rgba(255, 255, 255, .68);
  border-radius: 8px;
  background: rgba(255, 255, 255, .84);
  box-shadow: 0 14px 40px rgba(15, 23, 42, .18);
  backdrop-filter: blur(14px);
}

.game-title {
  min-width: 0;
  display: grid;
  gap: 3px;
}

.game-title strong {
  overflow: hidden;
  color: #102033;
  font-size: clamp(16px, 2.8vw, 23px);
  line-height: 1.1;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hud {
  display: flex;
  gap: 8px;
}

.hud-item {
  min-width: 70px;
  padding: 7px 9px;
  border: 1px solid rgba(16, 32, 51, .1);
  border-radius: 8px;
  background: rgba(255, 255, 255, .74);
  text-align: center;
}

.hud-item strong {
  display: block;
  margin-top: 2px;
  color: #102033;
  font-size: 18px;
  line-height: 1.05;
}

.stage-wrap {
  position: absolute;
  inset: 0 0 114px;
  padding: 92px 12px 8px;
}

.stage {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255,255,255,.18), transparent 42%),
    radial-gradient(circle at 78% 20%, rgba(255,255,255,.28), transparent 18%);
}

.factory-backdrop {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.factory-backdrop span {
  position: absolute;
  pointer-events: none;
}

.beam {
  width: 8px;
  height: 58%;
  left: 19%;
  top: 12%;
  border-radius: 999px;
  background: rgba(255, 255, 255, .34);
  transform: rotate(28deg);
}

.beam-two {
  left: 78%;
  height: 50%;
  transform: rotate(-31deg);
}

.gear {
  width: 94px;
  height: 94px;
  left: 10%;
  top: 16%;
  border: 12px dashed rgba(255, 255, 255, .42);
  border-radius: 50%;
  animation: spin 16s linear infinite;
}

.gear-two {
  left: auto;
  right: 9%;
  top: 22%;
  width: 68px;
  height: 68px;
  animation-duration: 12s;
  animation-direction: reverse;
}

.pipe-left,
.pipe-right {
  top: 0;
  left: 4%;
  width: 44px;
  height: 42%;
  border-radius: 0 0 18px 18px;
  background: linear-gradient(90deg, rgba(15,23,42,.25), rgba(255,255,255,.36), rgba(15,23,42,.18));
}

.pipe-right {
  left: auto;
  right: 5%;
  height: 36%;
}

.spark {
  left: 28%;
  top: 28%;
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: var(--gold);
  box-shadow: 0 0 22px rgba(250, 204, 21, .8);
  animation: spark 1.8s ease-in-out infinite;
}

.spark-two {
  left: 70%;
  top: 34%;
  animation-delay: .7s;
}

.conveyor {
  left: -4%;
  right: -4%;
  top: auto;
  bottom: -6%;
  height: 28%;
  border-radius: 50% 50% 0 0;
  background:
    repeating-linear-gradient(90deg, rgba(15,23,42,.22) 0 14px, rgba(255,255,255,.22) 14px 28px),
    linear-gradient(180deg, rgba(120, 53, 15, .25), rgba(120, 53, 15, .56));
}

.forge-meter {
  position: absolute;
  left: max(6px, env(safe-area-inset-left));
  top: 12px;
  bottom: 14px;
  z-index: 22;
  width: 76px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px 10px 18px;
  border: 1px solid rgba(255,255,255,.62);
  border-radius: 16px;
  background: rgba(255,255,255,.36);
  box-shadow: 0 22px 52px rgba(15,23,42,.18);
  backdrop-filter: blur(16px);
}

.forge-meter-label {
  color: #fff;
  text-shadow: 0 2px 8px rgba(15,23,42,.32);
}

.forge-meter-track {
  position: relative;
  width: 18px;
  flex: 1 1 auto;
  min-height: 0;
  border-radius: 999px;
  background: rgba(255,255,255,.24);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.36);
}

.forge-meter-fill {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: calc(var(--progress) * 1%);
  border-radius: inherit;
  background: linear-gradient(0deg, #0f766e, #38bdf8, #facc15);
  box-shadow: 0 0 18px rgba(255,255,255,.38);
  transition: height .45s ease;
}

.forge-meter-robot {
  position: absolute;
  left: 50%;
  bottom: calc((var(--progress) * 1%) - 4px);
  width: 34px;
  height: 36px;
  border: 3px solid #102033;
  border-radius: 12px;
  background:
    radial-gradient(circle at 33% 42%, #38bdf8 0 4px, transparent 5px),
    radial-gradient(circle at 67% 42%, #38bdf8 0 4px, transparent 5px),
    linear-gradient(180deg, #fff, #dbeafe);
  transform: translate(-50%, 50%);
  transition: bottom .45s ease;
}

.heart-bar {
  position: absolute;
  top: 12px;
  right: max(12px, env(safe-area-inset-right));
  z-index: 25;
  display: flex;
  gap: 5px;
  padding: 6px 9px;
  border-radius: 999px;
  background: rgba(255,255,255,.78);
  box-shadow: 0 12px 26px rgba(15,23,42,.14);
  backdrop-filter: blur(12px);
}

.heart {
  color: #f43f5e;
  font-size: 18px;
  line-height: 1;
  transition: opacity .25s ease, transform .25s ease;
}

.heart.is-lost {
  opacity: .24;
  transform: scale(.72);
  filter: grayscale(1);
}

.mission-panel {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: minmax(120px, .72fr) minmax(260px, 1.35fr);
  align-items: center;
  gap: clamp(12px, 3vw, 28px);
  padding: 22px 22px 0 94px;
}

.robot-bay {
  display: grid;
  place-items: center;
  min-width: 0;
}

.forge-robot {
  width: clamp(138px, 22vw, 238px);
  filter: drop-shadow(0 20px 22px rgba(15,23,42,.28));
  transform-origin: 50% 100%;
}

.forge-robot.is-happy {
  animation: robotHappy .72s ease;
}

.forge-robot.is-wrong {
  animation: robotWrong .42s ease;
}

.robot-svg-body {
  animation: robotIdle 2.8s ease-in-out infinite;
  transform-origin: 50% 80%;
}

.challenge-card {
  min-width: 0;
  max-width: 720px;
  display: grid;
  gap: 12px;
  justify-items: center;
  padding: clamp(16px, 4vw, 28px);
  border: 1px solid rgba(255,255,255,.7);
  border-radius: 8px;
  background: rgba(255,255,255,.9);
  box-shadow: 0 26px 70px rgba(15,23,42,.22);
  text-align: center;
}

.target-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.target-label {
  color: var(--teal);
}

.target-fraction {
  min-width: 86px;
  padding: 7px 12px;
  border-radius: 8px;
  background: #102033;
  color: #fff;
  font-size: clamp(24px, 4.8vw, 44px);
  font-weight: 950;
  line-height: 1;
}

.visual-zone {
  width: 100%;
  min-height: 180px;
  display: grid;
  place-items: center;
}

.core-builder {
  width: min(430px, 100%);
  display: grid;
  gap: 12px;
  justify-items: center;
}

.core-grid {
  width: min(390px, 100%);
  display: grid;
  grid-template-columns: repeat(var(--parts), minmax(0, 1fr));
  gap: 8px;
  padding: 12px;
  border-radius: 16px;
  background:
    radial-gradient(circle at 50% 0, rgba(56,189,248,.26), transparent 52%),
    #172033;
  box-shadow: inset 0 0 0 2px rgba(255,255,255,.12), 0 18px 34px rgba(15,23,42,.18);
}

.core-piece {
  aspect-ratio: 1;
  min-height: 48px;
  border: 0;
  border-radius: 10px;
  background:
    linear-gradient(180deg, rgba(255,255,255,.96), rgba(226,232,240,.92));
  color: #102033;
  box-shadow: inset 0 0 0 2px rgba(16,32,51,.16), 0 8px 0 rgba(15,23,42,.16);
  font-weight: 950;
  cursor: pointer;
}

.core-piece.is-selected {
  background:
    radial-gradient(circle at 50% 34%, rgba(255,255,255,.9), transparent 35%),
    linear-gradient(180deg, #facc15, #f97316);
  color: #fff;
  box-shadow: inset 0 0 0 2px rgba(255,255,255,.58), 0 0 24px rgba(249,115,22,.42);
  transform: translateY(3px);
}

.selection-note {
  min-height: 22px;
  color: var(--muted);
  font-weight: 850;
}

.cake-card {
  width: min(360px, 100%);
  justify-items: center;
  padding: 14px;
  background:
    radial-gradient(circle at 50% 20%, rgba(255,255,255,.92), rgba(255,247,237,.78)),
    rgba(255,255,255,.84);
}

.cake-card strong {
  min-width: 86px;
  padding: 6px 12px;
  border-radius: 8px;
  background: #102033;
  color: #fff;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1;
}

.cake-visual {
  display: grid;
  justify-items: center;
  gap: 6px;
  width: min(230px, 100%);
}

.cake-svg {
  width: min(190px, 58vw);
  height: auto;
  overflow: visible;
  filter: drop-shadow(0 18px 20px rgba(15,23,42,.18));
}

.cake-shadow {
  fill: rgba(15, 23, 42, .18);
}

.cake-plate {
  fill: #f8fafc;
  stroke: rgba(16, 32, 51, .18);
  stroke-width: 5;
}

.cake-slice {
  fill: #fff7ed;
  stroke: #7c2d12;
  stroke-width: 2.6;
}

.cake-slice.is-filled {
  fill: #f97316;
}

.cake-slice:nth-of-type(odd).is-filled {
  fill: #facc15;
}

.cake-center {
  fill: #7c2d12;
  stroke: #fff7ed;
  stroke-width: 3;
}

.cake-crumb {
  fill: #7c2d12;
  stroke: #fff7ed;
  stroke-width: 1.5;
}

.cake-label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

.fraction-strip {
  width: min(430px, 100%);
  display: grid;
  grid-template-columns: repeat(var(--parts), minmax(0, 1fr));
  gap: 4px;
  padding: 7px;
  border-radius: 12px;
  background: #172033;
}

.fraction-strip span {
  min-height: 44px;
  border-radius: 8px;
  background: rgba(255,255,255,.9);
}

.fraction-strip span.is-filled {
  background: linear-gradient(180deg, #facc15, #f97316);
  box-shadow: 0 0 20px rgba(249,115,22,.35);
}

.comparison-grid {
  width: min(560px, 100%);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
}

.compare-card,
.option-card {
  display: grid;
  gap: 8px;
  min-width: 0;
  padding: 12px;
  border-radius: 8px;
  background: rgba(255,255,255,.76);
  box-shadow: inset 0 0 0 1px rgba(16,32,51,.1);
  color: #102033;
  font-weight: 950;
}

.compare-vs {
  color: var(--teal);
  font-size: 18px;
  font-weight: 950;
}

#promptText {
  margin: 0;
  color: #102033;
  font-size: clamp(26px, 5vw, 48px);
  line-height: 1.04;
}

#detailText {
  min-height: 24px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(15px, 2.4vw, 18px);
  font-weight: 800;
  line-height: 1.4;
}

.answer-dock {
  position: absolute;
  left: max(10px, env(safe-area-inset-left));
  right: max(10px, env(safe-area-inset-right));
  bottom: max(10px, env(safe-area-inset-bottom));
  z-index: 30;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  padding: 10px;
  border: 1px solid rgba(255,255,255,.66);
  border-radius: 8px;
  background: rgba(255,255,255,.86);
  box-shadow: 0 18px 44px rgba(15,23,42,.22);
  backdrop-filter: blur(14px);
}

.answer-dock.is-builder {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.choice-button,
.forge-action {
  min-height: 64px;
  border: 0;
  border-radius: 8px;
  background: linear-gradient(180deg, #fff, #f1f8fb);
  color: #102033;
  box-shadow: inset 0 0 0 1px rgba(16,32,51,.1), 0 8px 0 rgba(16,32,51,.16);
  font-size: clamp(18px, 4vw, 30px);
  font-weight: 950;
  line-height: 1.08;
  padding: 8px 10px;
  overflow-wrap: anywhere;
  cursor: pointer;
}

.choice-button small {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
}

.choice-button:active,
.forge-action:active {
  transform: translateY(4px);
  box-shadow: inset 0 0 0 1px rgba(16,32,51,.1), 0 4px 0 rgba(16,32,51,.16);
}

.choice-button.correct,
.forge-action.primary {
  background: linear-gradient(180deg, #dcfce7, #86efac);
}

.choice-button.wrong {
  background: linear-gradient(180deg, #fee2e2, #fca5a5);
}

.forge-action.primary {
  color: #064e3b;
}

.forge-action.secondary {
  background: linear-gradient(180deg, #fff, #e0f2fe);
}

.feedback {
  position: absolute;
  left: 50%;
  top: 18%;
  z-index: 38;
  min-width: 150px;
  padding: 12px 18px;
  border-radius: 999px;
  background: rgba(16,32,51,.9);
  color: #fff;
  box-shadow: 0 18px 44px rgba(15,23,42,.22);
  font-size: clamp(19px, 4vw, 32px);
  font-weight: 950;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px) scale(.9);
}

.feedback.show {
  animation: feedback .85s ease;
}

.overlay-card h2 {
  margin: 0;
  color: #102033;
  font-size: clamp(28px, 6vw, 48px);
  line-height: 1.05;
}

.menu-robot-mark {
  width: 76px;
  height: 76px;
  margin: 0 auto 12px;
  display: grid;
  place-items: center;
  border-radius: 22px;
  background: linear-gradient(135deg, var(--teal), var(--blue));
  box-shadow: 0 14px 30px rgba(15,23,42,.16);
}

.menu-robot-mark span {
  width: 48px;
  height: 42px;
  border: 5px solid #102033;
  border-radius: 14px;
  background:
    radial-gradient(circle at 34% 45%, #38bdf8 0 5px, transparent 6px),
    radial-gradient(circle at 66% 45%, #38bdf8 0 5px, transparent 6px),
    #fff;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.mode-card {
  min-height: 142px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 7px;
  border: 0;
  border-radius: 8px;
  background: linear-gradient(180deg, #fff, #eef8fb);
  color: #102033;
  box-shadow: inset 0 -5px 0 rgba(16,32,51,.08), 0 14px 26px rgba(15,23,42,.12);
  cursor: pointer;
}

.mode-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--teal), var(--blue));
  color: #fff;
  font-size: 20px;
  font-weight: 950;
}

.mode-card strong {
  font-size: 18px;
  line-height: 1.1;
}

.mode-card span:last-child {
  width: min(180px, 100%);
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  line-height: 1.28;
}

.overlay-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 22px;
}

.action-button {
  min-width: 132px;
  min-height: 52px;
  border: 0;
  border-radius: 8px;
  background: var(--teal);
  color: #fff;
  font-size: 16px;
  font-weight: 950;
  cursor: pointer;
}

.action-button.secondary {
  background: #fff;
  color: #102033;
  box-shadow: inset 0 0 0 1px rgba(16,32,51,.13);
}

@keyframes brandLetterIn {
  0% { opacity: 0; transform: translateX(-28px) translateY(8px) rotate(-5deg); }
  68% { opacity: 1; transform: translateX(3px) translateY(0) rotate(1deg); }
  100% { opacity: 1; transform: translateX(0) translateY(0) rotate(0); }
}

@keyframes loaderSweep {
  0%, 18% { transform: rotate(-8deg) translateX(-62%); }
  62%, 100% { transform: rotate(-8deg) translateX(62%); }
}

@keyframes rotateCue {
  0%, 100% { transform: rotate(90deg); }
  48% { transform: rotate(0deg); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes spark {
  0%, 100% { opacity: .35; transform: translateY(0) scale(.8) rotate(0); }
  50% { opacity: 1; transform: translateY(-14px) scale(1.15) rotate(28deg); }
}

@keyframes robotIdle {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

@keyframes robotHappy {
  0%, 100% { transform: translateY(0) rotate(0); }
  44% { transform: translateY(-24px) rotate(-5deg); }
  72% { transform: translateY(-8px) rotate(4deg); }
}

@keyframes robotWrong {
  20% { transform: translateX(-9px) rotate(-4deg); }
  50% { transform: translateX(8px) rotate(4deg); }
  75% { transform: translateX(-4px) rotate(-2deg); }
}

@keyframes feedback {
  0% { opacity: 0; transform: translate(-50%, 12px) scale(.9); }
  18%, 72% { opacity: 1; transform: translate(-50%, 0) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -14px) scale(.95); }
}

@media (max-width: 760px) {
  .forge-app {
    min-height: 0;
  }

  .stage-wrap {
    inset-bottom: 124px;
    padding: 86px 6px 6px;
  }

  .mission-panel {
    grid-template-columns: minmax(94px, .54fr) minmax(228px, 1.46fr);
    align-content: center;
    gap: 8px;
    padding: 10px 8px 0 66px;
  }

  .robot-bay {
    display: grid;
  }

  .forge-robot {
    width: clamp(96px, 18vw, 168px);
  }

  .challenge-card {
    gap: 9px;
    padding: 14px 10px;
  }

  .visual-zone {
    min-height: 154px;
  }

  .forge-meter {
    top: 8px;
    bottom: 76px;
    width: 52px;
    padding: 8px 5px 12px;
  }

  .forge-meter-label {
    font-size: 9px;
  }

  .forge-meter-track {
    width: 15px;
  }

  .forge-meter-robot {
    width: 28px;
    height: 30px;
    border-width: 2px;
  }

  .heart-bar {
    top: 8px;
    right: 8px;
    padding: 5px 7px;
  }

  .heart {
    font-size: 15px;
  }

  .answer-dock,
  .answer-dock.is-builder {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    padding: 9px;
  }

  .choice-button,
  .forge-action {
    min-height: 54px;
  }

  .mode-grid {
    grid-template-columns: 1fr;
  }

  .mode-card {
    min-height: 116px;
  }
}

@media (max-width: 760px) and (orientation: portrait) {
  .forge-app:not(.is-loading) .rotate-overlay {
    display: flex;
  }
}

@media (max-height: 520px) and (orientation: landscape) {
  .forge-app {
    min-height: 0;
  }

  .game-topbar {
    top: max(8px, env(safe-area-inset-top));
    left: max(8px, env(safe-area-inset-left));
    right: max(8px, env(safe-area-inset-right));
    min-height: 50px;
    padding: 6px 8px;
  }

  .game-kicker {
    display: none;
  }

  .hud-item {
    min-width: 54px;
    padding: 5px 6px;
  }

  .hud-item span {
    font-size: 9px;
  }

  .hud-item strong {
    font-size: 14px;
  }

  .stage-wrap {
    inset: 0 0 82px;
    padding: 64px 6px 6px;
  }

  .mission-panel {
    grid-template-columns: minmax(80px, .46fr) minmax(220px, 1.54fr);
    gap: 6px;
    padding: 6px 6px 0 56px;
  }

  .forge-robot {
    width: clamp(82px, 15vw, 132px);
  }

  .challenge-card {
    gap: 6px;
    padding: 10px;
  }

  .target-row {
    gap: 7px;
  }

  .target-fraction {
    min-width: 64px;
    padding: 5px 9px;
    font-size: clamp(20px, 3.2vw, 28px);
  }

  .visual-zone {
    min-height: 122px;
  }

  .core-builder {
    gap: 7px;
  }

  .core-grid {
    gap: 5px;
    padding: 8px;
  }

  .core-piece {
    min-height: 32px;
  }

  .cake-card,
  .compare-card,
  .option-card {
    padding: 8px;
  }

  .cake-svg {
    width: min(124px, 22vw);
  }

  .comparison-grid {
    gap: 7px;
  }

  .fraction-strip {
    gap: 3px;
    padding: 5px;
  }

  .fraction-strip span {
    min-height: 28px;
  }

  #promptText {
    font-size: clamp(18px, 3vw, 24px);
  }

  #detailText {
    min-height: 18px;
    font-size: 13px;
    line-height: 1.25;
  }

  .forge-meter {
    top: 6px;
    bottom: 58px;
    width: 46px;
    padding: 7px 4px 10px;
  }

  .forge-meter-label {
    display: none;
  }

  .heart-bar {
    top: 6px;
    right: 6px;
  }

  .answer-dock,
  .answer-dock.is-builder {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
    padding: 6px;
  }

  .choice-button,
  .forge-action {
    min-height: 44px;
    padding: 6px 8px;
    font-size: clamp(15px, 2.6vw, 20px);
  }
}

@media (max-width: 430px) and (orientation: portrait) {
  .loader-card {
    padding-inline: 12px;
  }

  .loader-brand {
    font-size: clamp(24px, 9.6vw, 34px);
  }

  .game-topbar {
    min-height: 62px;
    gap: 8px;
  }

  .hud-item {
    min-width: 58px;
    padding-inline: 7px;
  }

  .hud-item span {
    font-size: 9px;
  }

  .hud-item strong {
    font-size: 15px;
  }

  .core-grid {
    gap: 6px;
    padding: 9px;
  }

  .core-piece {
    min-height: 38px;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .compare-vs {
    display: none;
  }

  .fraction-strip span {
    min-height: 34px;
  }
}

@media (max-height: 520px) and (orientation: landscape) {
  .game-overlay {
    align-items: stretch !important;
    justify-content: center !important;
    padding: 2px max(42px, env(safe-area-inset-right)) 2px max(2px, env(safe-area-inset-left)) !important;
    overflow: hidden !important;
  }

  .game-overlay.is-visible {
    display: flex !important;
  }

  .overlay-card {
    align-self: stretch !important;
    width: min(760px, calc(100vw - 48px)) !important;
    max-height: calc(100dvh - 4px) !important;
    overflow-y: auto !important;
    padding: 8px 10px !important;
    border-radius: 8px !important;
  }

  .menu-card {
    display: grid !important;
    align-content: start !important;
    gap: 8px !important;
  }

  .menu-robot-mark {
    display: none !important;
  }

  .overlay-kicker {
    margin: 0 0 2px !important;
    font-size: 9px !important;
  }

  .overlay-card h2 {
    margin: 0 !important;
    font-size: clamp(26px, 9vh, 42px) !important;
    line-height: .95 !important;
  }

  .menu-card > p {
    display: none !important;
  }

  .mode-grid,
  .mode-grid.two-col {
    grid-template-columns: repeat(auto-fit, minmax(104px, 1fr)) !important;
    gap: 6px !important;
  }

  .mode-card,
  .big-card {
    min-height: 86px !important;
    padding: 7px 6px !important;
    border-radius: 10px !important;
  }

  .mode-icon {
    width: 40px !important;
    height: 40px !important;
    margin: 0 auto 4px !important;
    border-radius: 10px !important;
    font-size: 15px !important;
  }

  .mode-card strong {
    font-size: clamp(13px, 3.8vh, 17px) !important;
    line-height: 1.08 !important;
  }

  .mode-card span:last-child {
    margin-top: 2px !important;
    font-size: 10px !important;
    line-height: 1.12 !important;
  }

  .overlay-actions {
    margin-top: 8px !important;
    gap: 8px !important;
  }

  .action-button,
  .forge-action {
    min-height: 36px !important;
    padding: 8px 12px !important;
    border-radius: 10px !important;
    font-size: 14px !important;
  }
}

/* Builder mode: small denominators should not leave blank columns or oversized plates. */
.answer-dock {
  left: max(4px, env(safe-area-inset-left)) !important;
  right: max(4px, env(safe-area-inset-right)) !important;
  width: auto !important;
  max-width: none !important;
  box-sizing: border-box !important;
}

.answer-dock.is-builder {
  grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
}

.core-grid[data-parts="2"] {
  width: min(240px, 100%) !important;
}

.core-grid[data-parts="3"] {
  width: min(330px, 100%) !important;
}

@media (max-height: 520px) and (orientation: landscape) {
  .answer-dock.is-builder {
    grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
  }

  .core-grid[data-parts="2"] {
    width: min(226px, 100%) !important;
  }

  .core-grid[data-parts="3"] {
    width: min(306px, 100%) !important;
  }

  .core-grid[data-parts="2"] .core-piece,
  .core-grid[data-parts="3"] .core-piece {
    min-height: 0 !important;
  }
}

/* Equivalent mode: keep the question visible in short mobile landscape. */
@media (max-height: 520px) and (orientation: landscape) {
  .forge-app[data-mode="equivalent"] .challenge-card {
    grid-template-rows: auto auto minmax(0, 1fr) !important;
    align-content: start !important;
    gap: 4px !important;
    padding: 7px 8px !important;
    overflow: hidden !important;
  }

  .forge-app[data-mode="equivalent"] .target-row {
    order: 1 !important;
  }

  .forge-app[data-mode="equivalent"] #promptText {
    order: 2 !important;
    margin: 0 !important;
    font-size: clamp(17px, 2.65vw, 22px) !important;
    line-height: 1.05 !important;
  }

  .forge-app[data-mode="equivalent"] .visual-zone {
    order: 3 !important;
    min-height: 0 !important;
    align-self: stretch !important;
    place-items: start center !important;
    overflow: hidden !important;
  }

  .forge-app[data-mode="equivalent"] #detailText {
    display: none !important;
  }

  .forge-app[data-mode="equivalent"] .cake-card {
    padding: 5px !important;
  }

  .forge-app[data-mode="equivalent"] .cake-visual {
    gap: 3px !important;
  }

  .forge-app[data-mode="equivalent"] .cake-svg {
    width: min(108px, 16vw, 24svh) !important;
  }

  .forge-app[data-mode="equivalent"] .cake-label {
    font-size: 11px !important;
    line-height: 1.12 !important;
  }
}