:root {
  --sweet-salmon: #fe938c;
  --desert-sand: #e6b89c;
  --wheat: #ead2ac;
  --cool-steel: #9cafb7;
  --cerulean: #4281a4;
  --bg: #ffffff;
  --ink: #142f3d;
  --coin-ink: #142f3d;
  --muted: #4281a4;
  --line: var(--desert-sand);
  --coin-face: var(--wheat);
  --coin-rim: var(--sweet-salmon);
  --coin-shadow: rgba(66, 129, 164, 0.28);
  --focus: var(--cerulean);
  --button: var(--cerulean);
  --button-text: var(--wheat);
  --button-disabled: var(--cool-steel);
  --ease-out: cubic-bezier(0.19, 1, 0.22, 1);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  text-rendering: optimizeLegibility;
}

button,
input {
  font: inherit;
}

img {
  display: block;
}

button {
  cursor: pointer;
}

button:disabled,
input:disabled {
  cursor: not-allowed;
}

button:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 5px;
}

.site-header {
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  width: 100%;
  padding: 18px;
  pointer-events: none;
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100%, 960px);
  margin: 0 auto;
  pointer-events: auto;
}

.brand-link {
  display: inline-flex;
  width: 100px;
  height: 32px;
  border-radius: 12px;
}

.brand-logo {
  display: block;
  width: 100%;
  height: 100%;
}

.site-nav {
  display: flex;
  align-items: center;
  min-height: 32px;
}

.site-nav-link {
  color: var(--cerulean);
  text-decoration-color: currentColor;
  text-underline-offset: 0.16em;
}

.site-nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: underline;
}

.site-nav-link:hover,
.site-nav-link:focus-visible {
  text-decoration: underline;
}

.app-shell {
  display: grid;
  grid-template-rows: auto auto auto auto;
  flex: 1 0 auto;
  justify-items: center;
  align-content: start;
  width: min(100%, 680px);
  min-height: 0;
  margin: 0 auto;
  padding: 56px 20px 44px;
}

.site-footer {
  flex-shrink: 0;
  width: 100%;
  padding: 0 20px 28px;
  color: var(--ink);
  font-size: 0.94rem;
  line-height: 1.4;
  text-align: center;
}

.site-footer a {
  color: var(--muted);
  text-decoration: underline;
  text-decoration-color: currentColor;
}

.question-form,
.result-question {
  width: min(100%, 420px);
  margin: 0 0 26px;
}

.question-input {
  display: block;
  width: 100%;
  min-height: 48px;
  border: 0;
  border-bottom: 2px solid var(--line);
  border-radius: 0;
  color: var(--ink);
  background: transparent;
  font-size: 1.18rem;
  line-height: 1.35;
  text-align: center;
  transition: border-color 160ms ease, opacity 160ms ease;
}

.question-input::placeholder {
  color: rgba(20, 47, 61, 0.42);
}

.question-input:focus {
  border-bottom-color: var(--cerulean);
}

.question-input:disabled {
  opacity: 0.48;
}

.prompt-example {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  gap: 0.15rem;
  margin: 10px auto 0;
  border: 0;
  padding: 0;
  background: transparent;
  color: rgba(20, 47, 61, 0.56);
  font-size: 0.95rem;
  font-family: inherit;
  line-height: 1.35;
  text-align: center;
}

.prompt-example:not(:disabled) {
  cursor: pointer;
}

.prompt-example-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35ch;
  width: 100%;
}

.prompt-example-prefix,
.prompt-example-text {
  color: rgba(20, 47, 61, 0.56);
}

.prompt-example-action {
  color: var(--cerulean);
  text-decoration: underline;
  text-underline-offset: 0.16em;
}

.prompt-example:disabled {
  cursor: not-allowed;
  opacity: 0.52;
}

.prompt-example:not(:disabled):hover .prompt-example-text,
.prompt-example:not(:disabled):focus-visible .prompt-example-text {
  color: var(--ink);
}

.result-question {
  display: -webkit-box;
  overflow: hidden;
  color: var(--muted);
  font-size: 1.08rem;
  font-style: italic;
  line-height: 1.35;
  text-align: center;
  overflow-wrap: anywhere;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.result-question[hidden],
.result-panel[hidden],
.toast[hidden],
.question-form[hidden],
.idle-actions[hidden] {
  display: none;
}

.coin-stage {
  display: grid;
  place-items: center;
  width: clamp(236px, 59vw, 426px);
  aspect-ratio: 1;
  margin: 0 0 28px;
  perspective: 1600px;
  perspective-origin: center center;
}

.coin-button {
  position: relative;
  display: grid;
  place-items: center;
  width: clamp(213px, 53vw, 384px);
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  -webkit-tap-highlight-color: transparent;
}

.coin-button:disabled {
  cursor: default;
}

.app-shell[data-phase="flipping"] .coin-button:disabled {
  cursor: wait;
}

.coin-shadow {
  position: absolute;
  inset: 78% 15% 9%;
  border-radius: 999px;
  background: var(--coin-shadow);
  filter: blur(18px);
  opacity: 0.72;
  transform: scaleX(0.82);
  will-change: transform, opacity;
}

.coin {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  will-change: transform;
}

.coin-tilt {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transform: rotateX(-12deg) rotateZ(-3deg);
}

.coin-assembly {
  display: block;
  position: absolute;
  inset: 0;
  z-index: 1;
  transform-style: preserve-3d;
  will-change: transform;
}

.coin-side {
  display: block;
  position: absolute;
  top: 3%;
  bottom: 3%;
  left: 50%;
  width: clamp(24px, 8%, 38px);
  z-index: 2;
  transform: translateX(-50%) translateZ(4px) scaleX(0.9);
  transform-origin: center center;
  opacity: 0;
  pointer-events: none;
  will-change: transform, opacity;
}

.coin-face {
  display: block;
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform-style: preserve-3d;
}

.coin-face-tails {
  transform: rotateY(180deg);
}

.coin-art {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 28px 40px rgba(66, 129, 164, 0.16));
  user-select: none;
  -webkit-user-drag: none;
}

.coin-side-art {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 12px 14px rgba(66, 129, 164, 0.18));
  user-select: none;
  -webkit-user-drag: none;
}

.button {
  min-height: 48px;
  border: 2px solid var(--button);
  border-radius: 999px;
  padding: 0 26px;
  font-weight: 800;
  line-height: 1;
  transition:
    background-color 160ms ease,
    color 160ms ease,
    border-color 160ms ease,
    opacity 160ms ease,
    transform 160ms ease;
}

.button:not(:disabled):active {
  transform: translateY(1px) scale(0.99);
}

.button-primary {
  color: var(--button-text);
  background: var(--button);
}

.button-secondary {
  color: var(--cerulean);
  background: transparent;
  border-color: var(--cerulean);
}

.button:disabled {
  border-color: var(--button-disabled);
  color: var(--wheat);
  background: var(--button-disabled);
}

.flip-button {
  min-width: 132px;
  letter-spacing: 0;
}

.idle-actions,
.result-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.idle-actions {
  margin-top: 2px;
}

.result-panel {
  display: grid;
  justify-items: center;
  margin-top: 4px;
  animation: result-in 280ms ease both;
}

.result-text {
  margin: 0 0 24px;
  font-size: clamp(3.75rem, 16vw, 5.8rem);
  font-weight: 950;
  line-height: 0.9;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 20;
  max-width: calc(100vw - 32px);
  border-radius: 999px;
  padding: 12px 18px;
  color: var(--button-text);
  background: var(--cerulean);
  font-size: 0.95rem;
  font-weight: 700;
  box-shadow: 0 16px 40px rgba(66, 129, 164, 0.28);
  transform: translateX(-50%);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

@keyframes result-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 420px) {
  .site-header {
    padding: 16px;
  }

  .site-header-inner {
    width: 100%;
  }

  .brand-link {
    width: 88px;
    height: 28px;
  }

  .site-nav-link {
    min-height: 28px;
    font-size: 0.94rem;
  }

  .app-shell {
    padding-top: 72px;
    padding-inline: 18px;
  }

  .button {
    padding-inline: 22px;
  }
}

@media (min-width: 768px) {
  .coin-stage {
    width: clamp(228px, 42vw, 402px);
  }

  .coin-button {
    width: clamp(206px, 38vw, 362px);
  }
}

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

  .button,
  .question-input {
    transition-duration: 1ms !important;
  }

  .result-panel {
    animation-duration: 1ms !important;
  }
}