/* 何が消えた？ (what_disappeared) — builds on /assets/styles.css tokens. A storybook room: the picture in a honey wood frame, a cream
   cover between the two pictures, four picture-and-word choices. Right / wrong are marked with ✓ / ✗, not colour only. */
:root {
  --wd-wood: #c9955f;
  --wd-cream: #fffaf0;
  --wd-paper: #f3e4cc;
  --wd-ok: #1f7a4d;
  --wd-ok-soft: #e7f6ee;
  --wd-ng: #b42318;
  --wd-ng-soft: #fdecea;
}

main.wd-main { width: min(100% - 1rem, 68rem); padding-block: .25rem 2.5rem; }
.wd-heading { display: flex; flex-wrap: wrap; align-items: baseline; gap: .1rem .6rem; margin: 0 0 .35rem; padding-inline: .25rem; }
.wd-heading h1 { margin: 0; font-size: clamp(1.45rem, 5vw, 2.1rem); line-height: 1.15; letter-spacing: -.02em; }
.wd-subtitle { margin: 0; color: var(--muted); font-size: .9rem; font-weight: 700; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; }

.wd-panel { display: grid; gap: .5rem; padding: .35rem; border: 1px solid var(--line-strong); border-radius: 1.1rem; background: linear-gradient(#fffaf2, #fff 45%); box-shadow: 0 10px 28px rgba(16, 35, 63, .08); }
.wd-panel [hidden] { display: none !important; }

/* Start */
.wd-start { display: grid; gap: .6rem; padding: .4rem; }
.wd-start-art { margin: 0; border-radius: .9rem; overflow: hidden; box-shadow: inset 0 0 0 3px var(--wd-wood); background: var(--wd-paper); }
.wd-start-art img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; max-height: 16rem; object-fit: cover; object-position: 60% 50%; }
.wd-modes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .4rem; margin: 0; padding: 0; border: 0; }
.wd-modes legend { margin-bottom: .3rem; padding: 0; color: var(--muted); font-size: .82rem; font-weight: 750; }
.wd-mode { display: grid; justify-items: start; gap: .05rem; min-height: 3.6rem; padding: .4rem .7rem; border: 1px solid var(--line-strong); border-radius: .8rem; background: #fff; color: var(--accent-dark); font: inherit; text-align: left; line-height: 1.25; cursor: pointer; touch-action: manipulation; }
.wd-mode-name { font-size: 1rem; font-weight: 820; }
.wd-mode-note { color: var(--muted); font-size: .76rem; font-weight: 650; }
.wd-mode[aria-pressed="true"] { border: 2px solid var(--accent); background: var(--accent); color: #fff; }
.wd-mode[aria-pressed="true"] .wd-mode-note { color: #e6f0fb; }
.wd-mode[aria-pressed="true"] .wd-mode-name::before { content: "✓ "; }
.wd-mode-all { grid-column: 1 / -1; }
.wd-start .primary-button[disabled] { opacity: .6; cursor: progress; }

/* Play: picture first; beside the controls from 56rem */
.wd-play { display: grid; gap: .5rem; grid-template-areas: "bar" "stage" "side"; }
.wd-bar { grid-area: bar; }
.wd-stage { grid-area: stage; }
.wd-side { grid-area: side; }
@media (min-width: 56rem) {
  .wd-play { grid-template-columns: auto minmax(18rem, 1fr); grid-template-areas: "bar bar" "stage side"; align-items: start; padding: .2rem; }
  .wd-play .wd-stage { width: min(36rem, max(17rem, 100svh - 12rem)); }
}
.wd-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .3rem .6rem; padding: 0 .2rem; font-weight: 750; font-size: .9rem; }
.wd-chip { padding: .05rem .6rem; border-radius: 999px; background: var(--soft); color: var(--accent-dark); font-size: .8rem; }
.wd-progress { font-variant-numeric: tabular-nums; }

.wd-stage { position: relative; width: min(100%, max(17rem, 100svh - 13rem)); aspect-ratio: 1; margin-inline: auto; border-radius: .9rem; overflow: hidden; background: var(--wd-paper); box-shadow: 0 0 0 3px var(--wd-wood), 0 4px 0 rgba(91, 58, 41, .18); }
.wd-canvas { display: block; width: 100%; height: 100%; }
.wd-ring { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.wd-ring circle { fill: none; stroke: #fff; stroke-width: 18; }
.wd-ring circle + circle { stroke: var(--focus); stroke-width: 9; stroke-dasharray: 22 12; }
.wd-ring.is-on { animation: wd-pop 420ms cubic-bezier(.3, .7, .4, 1.3); }
@keyframes wd-pop { from { opacity: 0; transform: scale(1.25); } to { opacity: 1; transform: scale(1); } }
.wd-ring { transform-origin: var(--ring-x, 50%) var(--ring-y, 50%); }

/* The cover between A and B: fully opaque while the picture is swapped. */
.wd-curtain { position: absolute; inset: 0; z-index: 3; display: grid; place-items: center; opacity: 0; background: radial-gradient(circle at 25% 30%, #f6e6c8 0 6%, transparent 7%) 0 0 / 5rem 5rem, radial-gradient(circle at 75% 75%, #f6e6c8 0 6%, transparent 7%) 0 0 / 5rem 5rem, var(--wd-cream); pointer-events: none; }
.wd-curtain svg { width: 28%; height: auto; color: #e2c597; }
.wd-curtain.is-moving { transition: opacity 150ms ease; }

.wd-side { display: grid; gap: .45rem; align-content: start; }
.wd-timer { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: .6rem; padding: 0 .2rem; }
.wd-timer-track { height: .7rem; border-radius: 999px; background: #eadcc6; overflow: hidden; }
.wd-timer-fill { height: 100%; border-radius: inherit; background: linear-gradient(90deg, #f0b85a, #e59a3a); transform-origin: left; }
.wd-timer-text { min-width: 5.5em; text-align: right; font-weight: 800; font-variant-numeric: tabular-nums; }
.wd-prompt { margin: 0; padding: 0 .2rem; font-size: 1.15rem; font-weight: 820; line-height: 1.35; }
.wd-prompt:focus { outline: none; }
.wd-prompt:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.wd-ready { min-height: 3rem; }

.wd-choices { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .4rem; margin: 0; padding: 0; list-style: none; }
.wd-choice { position: relative; display: grid; grid-template-columns: 2.9rem 1fr; align-items: center; gap: .45rem; width: 100%; min-height: 4.1rem; padding: .3rem .5rem .3rem .3rem; border: 2px solid var(--line-strong); border-radius: .85rem; background: #fff; color: var(--ink); font: inherit; font-size: .95rem; font-weight: 750; line-height: 1.25; text-align: left; cursor: pointer; touch-action: manipulation; -webkit-tap-highlight-color: transparent; }
.wd-choice:hover:not([aria-disabled="true"]) { border-color: var(--accent); background: #f6faff; }
.wd-choice:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.wd-choice img { width: 2.9rem; height: 2.9rem; border-radius: .6rem; background: var(--wd-cream); box-shadow: inset 0 0 0 1px #ecdcc4; }
.wd-choice-key { position: absolute; top: .2rem; right: .35rem; color: var(--muted); font-size: .7rem; font-weight: 700; }
.wd-choice[aria-disabled="true"] { cursor: default; }
.wd-choice.is-dim { opacity: .55; }
.wd-choice.is-correct { border-color: var(--wd-ok); background: var(--wd-ok-soft); opacity: 1; }
.wd-choice.is-wrong { border-color: var(--wd-ng); background: var(--wd-ng-soft); opacity: 1; }
.wd-mark { position: absolute; top: -.55rem; left: -.4rem; display: grid; place-items: center; width: 1.6rem; height: 1.6rem; border-radius: 50%; color: #fff; font-size: 1rem; font-weight: 900; line-height: 1; }
.is-correct .wd-mark { background: var(--wd-ok); }
.is-wrong .wd-mark { background: var(--wd-ng); }

.wd-feedback { display: grid; gap: .4rem; padding: .5rem .6rem; border-radius: .85rem; background: var(--soft); }
.wd-feedback-title { margin: 0; font-size: 1.25rem; font-weight: 850; }
.wd-feedback.is-correct .wd-feedback-title { color: var(--wd-ok); }
.wd-feedback.is-wrong .wd-feedback-title { color: var(--wd-ng); }
.wd-feedback p { margin: 0; }
.wd-feedback .primary-button { margin-top: 0; min-height: 3rem; }

/* Result */
.wd-result { display: grid; gap: .6rem; padding: .6rem; text-align: center; }
.wd-result h2 { margin: 0; font-size: 1.6rem; }
.wd-score { margin: 0; font-size: clamp(1.6rem, 6vw, 2.2rem); font-weight: 850; font-variant-numeric: tabular-nums; }
.wd-cheer { margin: 0; font-weight: 700; }
.wd-breakdown { display: flex; flex-wrap: wrap; justify-content: center; gap: .35rem; margin: 0; padding: 0; list-style: none; }
.wd-breakdown li { padding: .1rem .7rem; border-radius: 999px; background: var(--soft); font-size: .88rem; font-weight: 750; }
.wd-strip { display: grid; grid-template-columns: repeat(auto-fill, minmax(4.2rem, 1fr)); gap: .35rem; margin: 0; padding: 0; list-style: none; }
.wd-strip li { position: relative; display: grid; justify-items: center; gap: .1rem; padding: .3rem .2rem; border: 2px solid var(--line); border-radius: .7rem; background: #fff; font-size: .72rem; font-weight: 700; }
.wd-strip li.is-correct { border-color: var(--wd-ok); }
.wd-strip li.is-wrong { border-color: var(--wd-ng); }
.wd-strip img { width: 2.4rem; height: 2.4rem; }
.wd-result-actions { display: grid; gap: .4rem; }
.wd-secondary { min-height: 3rem; border: 1px solid var(--line-strong); border-radius: .7rem; background: #fff; color: var(--accent-dark); font: inherit; font-weight: 750; cursor: pointer; }
.wd-secondary:focus-visible, .wd-mode:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

@media (max-width: 30rem) {
  .wd-choice { min-height: 3.5rem; grid-template-columns: 2.5rem 1fr; font-size: .9rem; }
  .wd-choice img { width: 2.5rem; height: 2.5rem; }
  .wd-feedback { padding: .4rem .5rem; gap: .25rem; }
  .wd-feedback-title { font-size: 1.1rem; }
}

@media (prefers-reduced-motion: reduce) {
  .wd-curtain.is-moving { transition: none; }
  .wd-ring.is-on { animation: none; }
}