:root{color-scheme:dark;font-family:Inter,SF Pro Display,SF Pro Text,-apple-system,BlinkMacSystemFont,Hiragino Sans,Yu Gothic UI,sans-serif;color:#f4f7fb;background:#07101c;font-synthesis:none;text-rendering:optimizeLegibility;--background: #07101c;--surface: rgba(17, 29, 47, .82);--surface-strong: #142238;--surface-soft: rgba(255, 255, 255, .055);--border: rgba(255, 255, 255, .1);--muted: #96a5bb;--teal: #35d6c2;--teal-dark: #143b3c;--violet: #8695ff;--red: #ff7d89;--shadow: 0 30px 80px rgba(0, 0, 0, .3)}*{box-sizing:border-box}html{min-height:100%;background:var(--background)}body{min-width:320px;min-height:100vh;margin:0;background:radial-gradient(circle at 15% 0%,rgba(53,214,194,.13),transparent 34rem),radial-gradient(circle at 90% 18%,rgba(134,149,255,.11),transparent 30rem),var(--background)}button,select,input{font:inherit}button,select{-webkit-tap-highlight-color:transparent}button:focus-visible,select:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid 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rgba(53,214,194,.25);border-radius:999px;color:var(--teal);background:#35d6c214;font-size:.72rem;font-weight:850;letter-spacing:.16em}.sentence-text{width:100%;max-height:150px;overflow:hidden;color:#f7faff;font-weight:720;line-height:1.36;letter-spacing:-.026em;white-space:pre-line;text-wrap:balance;line-break:strict;word-break:normal;overflow-wrap:normal}.sentence-text.english{font-family:Inter,SF Pro Display,-apple-system,BlinkMacSystemFont,sans-serif}.sentence-text.japanese{font-weight:680;letter-spacing:-.04em}.sentence-text.message{color:#c8d3e3;font-size:clamp(1.35rem,5vw,2.1rem)}.stage-hint{min-height:1.4em;margin:23px 0 0;color:var(--muted);font-size:.88rem}.quiz-actions{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:0 22px 22px}.quiz-actions[hidden]{display:none}.answer-button{display:flex;min-height:88px;padding:14px 20px;border:1px solid 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