:root{--bg-primary: #0a0a1a;--bg-card: #12122a;--bg-card-hover: #1a1a3a;--text-primary: #e8e8f0;--text-secondary: #9a9ab8;--accent: #6c5ce7;--accent-glow: rgba(108, 92, 231, .3);--correct: #00b894;--correct-glow: rgba(0, 184, 148, .25);--wrong: #e17055;--wrong-glow: rgba(225, 112, 85, .25);--border: rgba(255, 255, 255, .08);--radius: 16px;--radius-sm: 10px;--font: "Noto Sans JP", sans-serif}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;overflow-x:hidden}#app{max-width:640px;margin:0 auto;padding:20px 16px;min-height:100vh}.screen{display:none}.screen.active{display:block;animation:fadeIn .4s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.hidden{display:none!important}.primary-btn{display:block;width:100%;max-width:320px;margin:24px auto 0;padding:16px 32px;background:linear-gradient(135deg,var(--accent),#8b5cf6);color:#fff;font-family:var(--font);font-size:1.05rem;font-weight:700;border:none;border-radius:var(--radius-sm);cursor:pointer;transition:transform .15s,box-shadow .15s;box-shadow:0 4px 20px var(--accent-glow)}.primary-btn:hover{transform:translateY(-2px);box-shadow:0 8px 30px var(--accent-glow)}.primary-btn:active{transform:translateY(0)}.secondary-btn{display:block;width:100%;max-width:320px;margin:12px auto 0;padding:14px 32px;background:transparent;color:var(--text-secondary);font-family:var(--font);font-size:.95rem;font-weight:600;border:1.5px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:all .15s}.secondary-btn:hover{color:var(--accent);border-color:var(--accent);background:var(--accent-glow)}.start-hero{text-align:center;padding:60px 0 40px}.start-icon{font-size:4rem;margin-bottom:16px;animation:bounce 2s infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.start-hero h1{font-size:1.8rem;font-weight:900;background:linear-gradient(135deg,#e8e8f0,#a5b4fc);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:12px}.start-desc{color:var(--text-secondary);font-size:.95rem;line-height:1.7;margin-bottom:32px}.start-info{display:flex;justify-content:center;gap:20px;margin-bottom:8px;flex-wrap:wrap}.info-item{display:flex;align-items:center;gap:6px;font-size:.85rem;color:var(--text-secondary);background:var(--bg-card);padding:8px 14px;border-radius:999px;border:1px solid var(--border)}.info-icon{font-size:1rem}.quiz-header{margin-bottom:20px}.progress-info{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}#question-counter{font-size:.9rem;font-weight:700;color:var(--accent)}.progress-bar{height:6px;background:#ffffff0f;border-radius:3px;overflow:hidden;margin-bottom:12px}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),#a78bfa);border-radius:3px;transition:width .5s ease;width:0%}.score-display{display:flex;gap:16px;font-size:.9rem;font-weight:600}.score-correct{color:var(--correct)}.score-wrong{color:var(--wrong)}.question-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;margin-bottom:16px}.question-category{display:inline-block;font-size:.75rem;font-weight:700;color:var(--accent);background:var(--accent-glow);padding:4px 12px;border-radius:999px;margin-bottom:16px;letter-spacing:.5px}.question-text{font-size:1.1rem;font-weight:700;line-height:1.7;margin-bottom:24px}.choices{display:flex;flex-direction:column;gap:10px}.choice-btn{display:flex;align-items:center;gap:12px;width:100%;padding:14px 18px;background:#ffffff08;border:1.5px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font);font-size:.95rem;font-weight:500;text-align:left;cursor:pointer;transition:all .2s}.choice-btn:hover:not(.disabled){background:var(--bg-card-hover);border-color:#6c5ce766;transform:translate(4px)}.choice-label{display:flex;align-items:center;justify-content:center;width:28px;height:28px;background:#ffffff0f;border-radius:50%;font-size:.8rem;font-weight:700;flex-shrink:0}.choice-btn.correct{background:var(--correct-glow);border-color:var(--correct);pointer-events:none}.choice-btn.correct .choice-label{background:var(--correct);color:#fff}.choice-btn.wrong{background:var(--wrong-glow);border-color:var(--wrong);pointer-events:none}.choice-btn.wrong .choice-label{background:var(--wrong);color:#fff}.choice-btn.disabled{opacity:.4;pointer-events:none}.explanation-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;animation:slideUp .35s ease}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.result-icon{font-size:2.4rem;text-align:center;margin-bottom:4px}.result-label{text-align:center;font-size:1.1rem;font-weight:900;margin-bottom:16px}.result-label.correct{color:var(--correct)}.result-label.wrong{color:var(--wrong)}.explanation-text{font-size:.9rem;line-height:1.8;color:var(--text-secondary);background:#ffffff05;padding:16px;border-radius:var(--radius-sm);border-left:3px solid var(--accent)}.result-hero{text-align:center;padding:40px 0}.result-rank-icon{font-size:5rem;margin-bottom:12px;animation:popIn .6s cubic-bezier(.175,.885,.32,1.275)}@keyframes popIn{0%{transform:scale(0);opacity:0}to{transform:scale(1);opacity:1}}.result-rank-title{font-size:1.6rem;font-weight:900;margin-bottom:16px}.result-score-big{font-size:3rem;font-weight:900;background:linear-gradient(135deg,var(--accent),#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:12px}.result-message{color:var(--text-secondary);font-size:.95rem;line-height:1.6;margin-bottom:32px}.result-breakdown{display:flex;flex-direction:column;gap:8px;max-width:400px;margin:0 auto 16px;text-align:left}.breakdown-item{display:flex;align-items:center;gap:10px;padding:10px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.85rem}.breakdown-icon{font-size:1.1rem;flex-shrink:0}.breakdown-q{flex:1;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.breakdown-result{font-weight:700;flex-shrink:0}.breakdown-result.correct{color:var(--correct)}.breakdown-result.wrong{color:var(--wrong)}.rank-s .result-rank-title{background:linear-gradient(135deg,gold,#fa0);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.rank-a .result-rank-title{color:var(--correct)}.rank-b .result-rank-title{color:#a78bfa}.rank-c .result-rank-title{color:var(--text-secondary)}.rank-d .result-rank-title{color:var(--wrong)}@media(max-width:480px){#app{padding:16px 12px}.start-hero{padding:40px 0 30px}.start-hero h1{font-size:1.5rem}.start-info{gap:8px}.info-item{font-size:.8rem;padding:6px 10px}.question-card{padding:20px 16px}.question-text{font-size:1rem}.choice-btn{padding:12px 14px;font-size:.9rem}.result-score-big{font-size:2.4rem}}