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/* v1.5.0: リッチな問題表示 */
.question-box--rich{position:relative;overflow:hidden;background:linear-gradient(135deg,#fff7ed,#eef7ff 48%,#f5f3ff);border:1px solid rgba(124,58,237,.16);box-shadow:inset 0 1px 0 rgba(255,255,255,.92),0 18px 42px rgba(39,48,92,.08)}.question-box--rich:before{content:"";position:absolute;inset:-45% auto auto -18%;width:260px;height:260px;border-radius:999px;background:radial-gradient(circle,rgba(255,255,255,.95),rgba(255,255,255,0) 68%);pointer-events:none}.question-box--rich:after{content:"";position:absolute;right:-70px;bottom:-90px;width:210px;height:210px;border-radius:58px;background:linear-gradient(135deg,rgba(6,182,212,.18),rgba(124,58,237,.16));transform:rotate(18deg);pointer-events:none}.question-box--rich>div{position:relative;z-index:1}.calc-tile,.digit-tile{display:inline-grid;place-items:center;min-width:1.15em;margin:.04em .07em;padding:.04em .16em;border-radius:.22em;background:linear-gradient(145deg,#fff,#eef2ff);box-shadow:0 .14em .34em rgba(33,42,80,.13),inset 0 .05em 0 rgba(255,255,255,.95);border:1px solid rgba(124,58,237,.12)}.calc-op{display:inline-grid;place-items:center;margin:0 .1em;color:var(--accent);text-shadow:0 .08em .16em rgba(124,58,237,.18)}.memory-digits .digit-tile{font-variant-numeric:tabular-nums;letter-spacing:0;color:#172033}.color-word-rich{display:inline-block;padding:.04em .32em;border-radius:.24em;background:#fff;box-shadow:0 .16em .38em rgba(33,42,80,.15),inset 0 .05em 0 rgba(255,255,255,.92)}.choice-grid button.color-choice{display:flex;align-items:center;justify-content:center;gap:10px}.color-dot{width:1.05em;height:1.05em;border-radius:999px;background:var(--token-color);box-shadow:inset 0 .15em .28em rgba(255,255,255,.46),0 .18em .38em rgba(33,42,80,.16)}.number-tile,.kana-tile,.word-tile{background:linear-gradient(145deg,#fff,#f1f5ff)!important;border:1px solid rgba(124,58,237,.12)!important;box-shadow:0 12px 26px rgba(36,45,82,.12),inset 0 1px 0 rgba(255,255,255,.95)!important}.number-tile{font-size:1.25rem}.kana-tile{font-size:1.35rem}.word-tile{font-size:1rem;letter-spacing:.04em}.nback-number{display:inline-block;padding:.08em .38em;border-radius:.28em;background:#fff;box-shadow:0 .16em .38em rgba(33,42,80,.15)}.spot-symbol,.kanji-tile span{display:inline-grid;place-items:center;min-width:1.8em;min-height:1.8em;border-radius:.52em;background:linear-gradient(145deg,#fff,#eef2ff);box-shadow:inset 0 1px 0 rgba(255,255,255,.95),0 8px 18px rgba(36,45,82,.11);font-weight:950}.kanji-tile span{font-size:1.18em}.instant-question-label{display:inline-block;padding:.1em .38em;border-radius:.22em;background:rgba(255,255,255,.72);box-shadow:0 .12em .28em rgba(36,45,82,.12)}.visual-choice{display:grid!important;grid-template-rows:auto auto;place-items:center;gap:8px;min-height:112px!important;padding:12px 10px!important}.visual-choice>span:last-child{font-size:.86rem;color:#475569;line-height:1.25}.brain-token{--token-color:#7c3aed;--token-rotate:0deg;position:relative;display:inline-grid;place-items:center;width:1.9em;height:1.9em;border-radius:.5em;background:linear-gradient(145deg,rgba(255,255,255,.96),rgba(226,232,240,.9));box-shadow:0 .2em .48em rgba(15,23,42,.18),inset 0 .08em .08em rgba(255,255,255,.95),inset 0 -.12em .18em rgba(15,23,42,.08);transform:perspective(520px) rotateX(12deg) rotateY(-12deg) rotate(var(--token-rotate));transform-style:preserve-3d;isolation:isolate}.brain-token:before{content:"";position:absolute;inset:.18em;border-radius:inherit;background:radial-gradient(circle at 30% 25%,rgba(255,255,255,.92),transparent 32%),linear-gradient(145deg,color-mix(in srgb,var(--token-color),white 30%),var(--token-color));box-shadow:inset 0 .12em .16em rgba(255,255,255,.32),inset 0 -.16em .24em rgba(0,0,0,.18);z-index:0}.brain-token__shine{position:absolute;left:.38em;top:.28em;width:.55em;height:.22em;border-radius:999px;background:rgba(255,255,255,.72);filter:blur(.5px);z-index:1}.brain-token__glyph{position:relative;z-index:2;color:#fff;font-size:1.18em;line-height:1;text-shadow:0 .08em .12em rgba(0,0,0,.32),0 0 .2em color-mix(in srgb,var(--token-color),white 55%)}.choice-token{font-size:2rem}.brain-token--circle{border-radius:999px}.brain-token--circle:before{border-radius:999px}.brain-token--diamond{border-radius:.44em;transform:perspective(520px) rotateX(12deg) rotateY(-12deg) rotate(45deg)}.brain-token--diamond .brain-token__glyph{transform:rotate(-45deg)}.brain-token--star:before{background:radial-gradient(circle at 35% 28%,rgba(255,255,255,.92),transparent 32%),linear-gradient(145deg,color-mix(in srgb,var(--token-color),white 42%),var(--token-color))}.brain-token--heart .brain-token__glyph{font-size:1.04em}.brain-token.is-rotated{transform:perspective(520px) rotateX(14deg) rotateY(-14deg) rotate(var(--token-rotate))}.shape-rotate-stage{display:flex;align-items:center;justify-content:center;gap:clamp(12px,4vw,34px);flex-wrap:wrap}.shape-rotate-card{display:grid;place-items:center;gap:6px;min-width:130px;padding:14px;border-radius:22px;background:rgba(255,255,255,.78);box-shadow:0 14px 32px rgba(36,45,82,.11);border:1px solid rgba(124,58,237,.12)}.shape-rotate-card small{font-size:.78rem;color:#64748b;font-weight:950}.shape-rotate-token{font-size:3.35rem}.shape-rotate-vs{padding:7px 13px;border-radius:999px;background:#172033;color:#fff;font-size:.86rem;font-weight:950}.pair-grid button.pair-card{position:relative;display:grid;place-items:center;min-height:86px;padding:10px;overflow:hidden;background:linear-gradient(145deg,#fff,#f1f5ff)}.pair-grid button.pair-card:before{content:"";position:absolute;inset:7px;border-radius:14px;border:1px dashed rgba(124,58,237,.16);pointer-events:none}.pair-card-back{display:grid;place-items:center;width:2.2em;height:2.2em;border-radius:.55em;background:linear-gradient(145deg,#e0e7ff,#f8fafc);color:#64748b;box-shadow:inset 0 1px 0 rgba(255,255,255,.9);font-weight:950}.pair-token{font-size:2.2rem}.pair-symbol-raw{font-size:2rem;font-weight:950}.pair-grid button.is-open{background:linear-gradient(145deg,#eef2ff,#fff)}.pair-grid button.is-done{background:linear-gradient(145deg,#dcfce7,#f0fdf4);color:#166534}.pair-grid button.is-done:before{border-color:rgba(22,101,52,.22)}@media(max-width:640px){.visual-choice{min-height:96px!important}.choice-token{font-size:1.65rem}.shape-rotate-token{font-size:2.65rem}.shape-rotate-card{min-width:112px}.pair-token{font-size:1.9rem}}