:root {
  /* Semantic layer: built only from IE tokens (../../../theme/ie-tokens.css).
     Light values here; dark values in [data-theme="dark"] below. */
  --font-ui: "Montserrat", Arial, Helvetica, sans-serif;
  --font-read: "PT Serif", Georgia, "Times New Roman", serif;

  --ink: var(--ie-black);
  --muted: var(--ie-darkgrey);
  --page: var(--ie-white-ie);
  --paper: var(--ie-white);
  --card: var(--ie-white);
  --card-soft: var(--ie-softgrey);
  --line: color-mix(in srgb, var(--ie-lightgrey) 70%, transparent);
  --line-strong: var(--ie-midgrey);
  --chip: var(--ie-white-ie);
  --track: var(--ie-white-ie);

  --navy: var(--ie-oceanblue);          /* host bar + experiment panel */
  --on-navy: var(--ie-white);
  --on-navy-muted: var(--ie-lightblue);
  --blue: var(--ie-electricblue);       /* switch, primary actions, labels */
  --blue-dark: var(--ie-oceanblue);
  --on-blue: var(--ie-white);
  --cyan: var(--ie-seablue);            /* accents on the navy panels */
  --on-cyan: var(--ie-techblack);
  --stay: var(--ie-techgreen);          /* your door / stay strategy (fills only) */
  --stay-text: var(--ie-techgreen-new);
  --yellow: var(--ie-lemon);            /* door numbers and knobs */
  --focus: var(--ie-electricblue);

  --door: var(--ie-vigred);
  --door-dark: #A3000B;
  --door-shadow: #5E0007;
  --frame: #1A1A3D;
  --frame-shadow: #10102A;
  --doorway: var(--ie-techblack);

  --win-fg: var(--ie-techgreen-new);
  --win-bg: color-mix(in srgb, var(--ie-techgreen) 18%, white);
  --loss-fg: #8A0009;
  --loss-bg: color-mix(in srgb, var(--ie-vigred) 10%, white);
  --note-fg: var(--ie-oceanblue);
  --note-bg: var(--ie-iceblue);
  --note-line: var(--ie-vigred);

  --shadow: 0 18px 55px rgba(0, 0, 36, 0.10);
  font-family: var(--font-ui);
  color: var(--ink);
  background: var(--page);
  color-scheme: light;
  font-synthesis: none;
}

:root[data-theme="dark"] {
  --ink: var(--ie-white-ie);
  --muted: var(--ie-lightgrey);
  --page: var(--ie-techblack);
  --paper: var(--ie-night-surface);
  --card: var(--ie-techblack);
  --card-soft: var(--ie-techblack);
  --line: var(--ie-night-border);
  --line-strong: var(--ie-midgrey);
  --chip: var(--ie-night-border);
  --track: var(--ie-night-border);

  --navy: var(--ie-oceanblue);
  --blue: var(--ie-seablue);
  --blue-dark: var(--ie-lightblue);
  --on-blue: var(--ie-techblack);
  --stay-text: var(--ie-techgreen);
  --focus: var(--ie-seablue);

  --frame: #2B2B5E;
  --frame-shadow: #000012;
  --doorway: #00000F;
  --door-shadow: #3A0004;

  --win-fg: var(--ie-techgreen);
  --win-bg: color-mix(in srgb, var(--ie-techgreen) 16%, var(--ie-techblack));
  --loss-fg: var(--ie-red-on-dark);
  --loss-bg: color-mix(in srgb, var(--ie-vigred) 18%, var(--ie-techblack));
  --note-fg: var(--ie-lightblue);
  --note-bg: var(--ie-oceanblue);
  --note-line: var(--ie-red-on-dark);

  --shadow: 0 18px 55px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 9% 5%, color-mix(in srgb, var(--cyan) 22%, transparent), transparent 20rem),
    var(--page);
}

button {
  font: inherit;
}

button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

.theme-toggle {
  position: fixed;
  z-index: 10;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  background: var(--paper);
  box-shadow: var(--shadow);
  cursor: pointer;
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 64px 28px 40px;
  text-align: center;
}

.hero__eyebrow,
.section-label {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-read);
  font-size: clamp(3.4rem, 9vw, 6.8rem);
  font-weight: 700;
  letter-spacing: -0.065em;
  line-height: 0.94;
}

.hero h1 em {
  color: var(--blue);
  font-weight: inherit;
}

.hero__subtitle {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
}

main,
footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

section {
  margin-bottom: 28px;
}

.game-card,
.dashboard,
.explanation {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.game-card {
  padding: 34px clamp(18px, 5vw, 56px) 44px;
  overflow: hidden;
}

.game-card__topline,
.dashboard__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

h2 {
  margin: 0;
  font-size: clamp(1.55rem, 3vw, 2.25rem);
  letter-spacing: -0.035em;
}

.button {
  min-height: 46px;
  padding: 0 20px;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 800;
  transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button:active {
  transform: translateY(0);
}

.button--quiet {
  color: var(--muted);
  background: var(--chip);
}

.button--primary,
.button--switch {
  color: var(--on-blue);
  background: var(--blue);
  box-shadow: 0 8px 20px color-mix(in srgb, var(--blue) 25%, transparent);
}

.button--primary:hover,
.button--switch:hover {
  background: var(--blue-dark);
}

.button--stay {
  color: var(--ink);
  background: var(--yellow);
  box-shadow: none;
}

.host-message {
  display: flex;
  align-items: center;
  gap: 12px;
  width: fit-content;
  max-width: 100%;
  margin: 30px auto 8px;
  padding: 12px 18px;
  border-radius: 14px;
  color: var(--on-navy);
  background: var(--navy);
  font-weight: 700;
}

.host-message__icon {
  font-size: 1.25rem;
}

.doors {
  display: grid;
  grid-template-columns: repeat(3, minmax(110px, 190px));
  justify-content: center;
  gap: clamp(18px, 6vw, 66px);
  padding: 52px 0 56px;
}

/* Each door = a fixed doorway (.door__inside, holds the prize)
   + a leaf (.door__leaf) that swings open on its left hinge.
   The prize lives in the doorway, so it stays put and is seen *behind* the open leaf. */
.door {
  position: relative;
  aspect-ratio: 0.58;
  padding: 0;
  border: 0;
  border-radius: 6px 6px 2px 2px;
  color: #fff;
  background: transparent;
  cursor: pointer;
  perspective: 1400px;
  perspective-origin: 15% 50%;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.door:disabled {
  cursor: default;
}

.door:not(:disabled):hover {
  transform: translateY(-6px);
}

.door__inside {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border: 9px solid var(--frame);
  border-bottom-width: 12px;
  border-radius: inherit;
  background:
    radial-gradient(ellipse at 50% 85%, color-mix(in srgb, var(--yellow) 22%, transparent), transparent 60%),
    var(--doorway);
  box-shadow: 0 13px 0 var(--frame-shadow), 0 23px 25px rgba(0, 0, 36, 0.18);
}

.door__prize {
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  line-height: 1;
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 260ms ease 220ms, transform 360ms cubic-bezier(0.2, 1.4, 0.4, 1) 220ms;
}

.door.is-open .door__prize {
  opacity: 1;
  transform: scale(1);
}

.door__leaf {
  position: absolute;
  inset: 0;
  border: 9px solid var(--door-dark);
  border-bottom-width: 12px;
  border-radius: inherit;
  background: var(--door);
  box-shadow: 0 13px 0 var(--door-shadow), 0 23px 25px rgba(0, 0, 36, 0.18);
  transform-origin: left center;
  transition: transform 650ms cubic-bezier(0.2, 0.85, 0.3, 1), filter 650ms ease;
}

.door:not(:disabled):hover .door__leaf {
  filter: brightness(1.08);
}

.door.is-open .door__leaf {
  transform: rotateY(-82deg);
  filter: brightness(0.7);
  box-shadow: none;
}

.door__number {
  position: absolute;
  top: 7%;
  left: 50%;
  width: 47px;
  height: 47px;
  display: grid;
  place-items: center;
  border: 3px solid color-mix(in srgb, var(--yellow) 40%, white);
  border-radius: 50%;
  color: var(--ink);
  background: var(--yellow);
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.3);
  font-family: var(--font-read);
  font-size: 1.6rem;
  font-weight: 800;
  transform: translateX(-50%);
}

.door__panel {
  position: absolute;
  left: 14%;
  right: 14%;
  border: 4px solid color-mix(in srgb, var(--door-dark) 85%, transparent);
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.14);
}

.door__panel--top {
  top: 31%;
  height: 24%;
}

.door__panel--bottom {
  bottom: 9%;
  height: 26%;
}

.door__knob {
  position: absolute;
  top: 61%;
  right: 10%;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: 0 2px 0 color-mix(in srgb, var(--yellow) 55%, black);
}

/* Tag under the door: "Your pick", "Switch?", "Final pick", "First pick" */
.door__tag {
  position: absolute;
  z-index: 3;
  left: 50%;
  bottom: -40px;
  width: max-content;
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--on-cyan);
  background: var(--cyan);
  font-size: 0.75rem;
  font-weight: 850;
  transform: translateX(-50%);
  transition: background 150ms ease, color 150ms ease;
}

.door__tag:empty {
  display: none;
}

.door.is-selected {
  box-shadow: 0 0 0 6px var(--stay);
}

.door.is-selected .door__tag {
  background: var(--stay);
}

/* Deciding phase: the other closed door is offered as the switch */
.door.is-offer {
  box-shadow: 0 0 0 4px var(--blue);
  animation: offer-pulse 1.8s ease-in-out infinite;
}

.door.is-offer .door__tag {
  color: var(--on-blue);
  background: var(--blue);
}

.door.is-offer:hover,
.door.is-offer:focus-visible {
  animation: none;
  box-shadow: 0 0 0 6px var(--blue);
}

.doors.is-deciding .door.is-selected:hover .door__tag,
.doors.is-deciding .door.is-selected:focus-visible .door__tag {
  color: var(--on-cyan);
  background: var(--stay);
}

.door.is-previous {
  box-shadow: 0 0 0 3px var(--line-strong);
}

.door.is-previous .door__tag {
  color: var(--muted);
  background: var(--chip);
}

@keyframes offer-pulse {
  0%, 100% { box-shadow: 0 0 0 4px var(--blue); }
  50% { box-shadow: 0 0 0 4px var(--blue), 0 0 0 12px color-mix(in srgb, var(--blue) 18%, transparent); }
}

.result-actions {
  margin-top: 14px;
  text-align: center;
}

.dashboard {
  padding: 36px clamp(22px, 5vw, 52px);
}

.text-button {
  padding: 8px;
  border: 0;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-weight: 750;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.strategy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 30px;
}

.strategy {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
}

.strategy__heading {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
}

.strategy__heading h3,
.strategy__heading strong {
  margin: 0;
  font-size: 1.2rem;
}

.strategy__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--stay);
}

.strategy--switch .strategy__dot {
  background: var(--blue);
}

.meter {
  height: 12px;
  margin: 17px 0 13px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--track);
}

.meter span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--stay);
  transition: width 500ms ease;
}

.strategy--switch .meter span {
  background: var(--blue);
}

.strategy p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.history-block {
  margin-top: 28px;
}

.history-block__label {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.history {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 31px;
}

.history__empty {
  color: var(--muted);
  font-size: 0.92rem;
}

.history__item {
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--win-fg);
  background: var(--win-bg);
  font-size: 0.78rem;
  font-weight: 800;
}

.history__item.is-loss {
  color: var(--loss-fg);
  background: var(--loss-bg);
}

.experiment {
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  border-radius: 28px;
  color: var(--on-navy);
  background: var(--navy);
  box-shadow: var(--shadow);
}

.experiment__copy,
.experiment__visual {
  padding: clamp(30px, 5vw, 54px);
}

.section-label--light {
  color: var(--cyan);
}

.experiment h2 {
  max-width: 420px;
  color: var(--on-navy);
}

.experiment__copy > p:not(.section-label) {
  max-width: 520px;
  margin: 16px 0 26px;
  color: var(--on-navy-muted);
  line-height: 1.6;
}

.experiment__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button--light {
  color: var(--on-navy);
  background: rgba(255, 255, 255, 0.12);
}

.button--light:hover {
  background: rgba(255, 255, 255, 0.2);
}

.button--yellow {
  color: var(--on-cyan);
  background: var(--cyan);
}

.experiment__visual {
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: rgba(255, 255, 255, 0.055);
}

#simulation-count {
  margin: 0 0 22px;
  color: var(--cyan);
  font-size: 0.83rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.comparison__row {
  display: grid;
  grid-template-columns: 62px 1fr 54px;
  align-items: center;
  gap: 12px;
  margin: 15px 0;
}

.comparison__row span {
  color: var(--on-navy-muted);
  font-weight: 750;
}

.comparison__row b {
  text-align: right;
}

.comparison__track {
  height: 24px;
  overflow: hidden;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.1);
}

.comparison__track i {
  display: block;
  width: 0;
  height: 100%;
  background: var(--stay);
  transition: width 750ms cubic-bezier(0.2, 0.8, 0.3, 1);
}

.comparison__row:nth-child(2) .comparison__track i {
  background: var(--cyan);
}

.experiment__note {
  min-height: 44px;
  margin: 22px 0 0;
  color: var(--on-navy-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.explanation {
  overflow: hidden;
}

.explanation__toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px clamp(22px, 5vw, 50px);
  border: 0;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  text-align: left;
}

.explanation__toggle small {
  display: block;
  margin-bottom: 5px;
  color: var(--blue);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.explanation__toggle strong {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

.explanation__plus {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--on-blue);
  background: var(--blue);
  font-size: 1.7rem;
  transition: transform 200ms ease;
}

.explanation__toggle[aria-expanded="true"] .explanation__plus {
  transform: rotate(45deg);
}

.explanation__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  padding: 0 clamp(22px, 5vw, 50px) 40px;
}

.explanation__body[hidden] {
  display: none;
}

.probability {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px;
  border-radius: 18px;
  background: var(--card-soft);
  border: 1px solid var(--line);
}

.probability > span {
  flex: 0 0 auto;
  font-family: var(--font-read);
  font-size: 3rem;
  font-weight: 750;
}

.probability--third > span {
  color: var(--stay-text);
}

.probability--twothirds > span {
  color: var(--blue);
}

.probability h3 {
  margin: 0 0 5px;
}

.probability p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.rule-callout {
  grid-column: 1 / -1;
  padding: 16px 20px;
  border-left: 5px solid var(--note-line);
  border-radius: 5px 12px 12px 5px;
  color: var(--note-fg);
  background: var(--note-bg);
  line-height: 1.5;
}

footer {
  display: flex;
  justify-content: space-between;
  padding: 18px 8px 40px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

[hidden] {
  display: none !important;
}

@media (max-width: 760px) {
  .hero {
    padding-top: 44px;
  }

  .doors {
    gap: 18px;
    padding-top: 42px;
  }

  .door__inside,
  .door__leaf {
    border-width: 6px;
    border-bottom-width: 9px;
  }

  .door__number {
    width: 38px;
    height: 38px;
    font-size: 1.25rem;
  }

  .door__knob {
    width: 10px;
    height: 10px;
  }

  .strategy-grid,
  .experiment,
  .explanation__body {
    grid-template-columns: 1fr;
  }

  .rule-callout {
    grid-column: auto;
  }
}

@media (max-width: 520px) {
  main,
  footer {
    width: min(100% - 20px, 1120px);
  }

  .game-card__topline,
  .dashboard__header {
    align-items: flex-start;
  }

  .button--quiet {
    min-height: 38px;
    padding: 0 12px;
    font-size: 0.78rem;
  }

  .doors {
    grid-template-columns: repeat(3, minmax(75px, 1fr));
    gap: 11px;
  }

  .door__tag {
    bottom: -31px;
    font-size: 0.63rem;
  }

  .host-message {
    font-size: 0.85rem;
  }

  footer {
    flex-direction: column;
    gap: 5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .door.is-offer {
    animation: none;
  }
}