:root{--accent: #4f46e5;--accent-light: #6366f1;--accent-dark: #3730a3;--bg-1: #eef2ff;--bg-2: #f5f3ff;--ink: #1e1b2e;--muted: #6b7280;--border: #e2e4ec;--surface: #fff;--correct: #16a34a;--incorrect: #e11d48;color-scheme:light}*{box-sizing:border-box}body{margin:0;background:linear-gradient(180deg,var(--bg-1),var(--bg-2));color:var(--ink);font-family:Hiragino Sans,Yu Gothic,Noto Sans JP,system-ui,sans-serif;line-height:1.6}#root{max-width:640px;width:100%;margin:0 auto;padding:16px 16px 48px}.page{display:flex;flex-direction:column;gap:16px}.header h1{margin:12px 0 4px;font-size:clamp(22px,5vw,30px)}.header .lead{margin:0;color:var(--muted);font-size:15px}.card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:16px;box-shadow:0 4px 16px #1e1b2e0d}.card h3{margin:0 0 8px;font-size:15px;color:var(--muted)}.filter-panel{display:flex;flex-direction:column;gap:18px}.filter-group h3{margin-bottom:8px}.chip-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:8px}.chip{display:flex;align-items:center;gap:6px;padding:8px 10px;border:1px solid var(--border);border-radius:999px;font-size:13px;cursor:pointer;background:#fafafe;-webkit-user-select:none;user-select:none}.chip input{accent-color:var(--accent)}.chip-active{background:var(--bg-1);border-color:var(--accent-light);color:var(--accent-dark);font-weight:600}.filter-hint{margin:0;color:var(--muted);font-size:13px}.filter-count{margin:0;font-size:14px}.assist-select{width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--border);font-size:15px;background:#fff}.submit{width:100%;min-height:48px;border:none;border-radius:12px;background:var(--accent);color:#fff;font-size:16px;font-weight:600;cursor:pointer;transition:background .15s ease}.submit:disabled{background:#c7c9d9;cursor:not-allowed}.submit:not(:disabled):hover{background:var(--accent-dark)}.submit-secondary{background:#fff;color:var(--accent-dark);border:1px solid var(--accent-light)}.submit-secondary:not(:disabled):hover{background:var(--bg-1)}.start-buttons{gap:10px}.link-button{background:none;border:none;color:var(--accent-dark);font-size:14px;text-decoration:underline;cursor:pointer;padding:8px 0;align-self:flex-start}.link-danger{color:var(--incorrect)}.question-card{text-align:center;padding:20px 12px;background:var(--bg-1);border-radius:12px}.question-eyebrow{margin:0 0 6px;font-size:13px;color:var(--muted)}.question-text{margin:0;font-size:clamp(18px,5vw,24px);font-weight:700}.progress-bar{display:flex;flex-direction:column;gap:6px}.progress-bar-track{height:8px;border-radius:999px;background:var(--border);overflow:hidden}.progress-bar-fill{height:100%;background:var(--accent);transition:width .2s ease}.progress-bar-label{margin:0;font-size:13px;color:var(--muted);text-align:right}.answer-form{display:flex;flex-direction:column;gap:10px}.answer-input-wrap{position:relative}.answer-input{width:100%;min-height:48px;padding:10px 14px;border:1px solid var(--border);border-radius:12px;font-size:16px}.answer-input:focus{outline:2px solid var(--accent-light);outline-offset:1px}.suggestion-list{position:absolute;z-index:10;top:calc(100% + 4px);left:0;right:0;max-height:240px;overflow-y:auto;margin:0;padding:6px;list-style:none;background:#fff;border:1px solid var(--border);border-radius:12px;box-shadow:0 8px 24px #1e1b2e1f}.suggestion-item{width:100%;text-align:left;padding:10px 12px;border:none;background:none;border-radius:8px;font-size:15px;cursor:pointer}.suggestion-item:hover,.suggestion-active{background:var(--bg-1)}.hint-panel{border:1px dashed var(--accent-light);border-radius:12px;padding:12px 14px;background:#fbfbff}.hint-panel-title{margin:0 0 8px;font-size:13px;font-weight:600;color:var(--accent-dark)}.hint-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:8px}.hint-item{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:4px 8px;font-size:14px;padding:6px 10px;background:#fff;border:1px solid var(--border);border-radius:8px;min-width:0}.hint-label{color:var(--muted);flex-shrink:0}.hint-value{font-weight:600;text-align:right}.hint-reveal-button{border:1px solid var(--accent-light);background:var(--bg-1);color:var(--accent-dark);font-size:12px;font-weight:600;padding:5px 10px;border-radius:999px;cursor:pointer}.hint-reveal-button:hover{background:var(--accent-light);color:#fff}.filter-summary{background:var(--bg-1);border-radius:10px;padding:10px 14px}.filter-summary-title{margin:0 0 4px;font-size:13px;font-weight:600;color:var(--accent-dark)}.filter-summary-list{margin:0;padding-left:18px;font-size:13px;color:var(--ink)}.attempt-history{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}.attempt-history li{display:flex;align-items:center;gap:4px;padding:4px 10px;border-radius:999px;font-size:13px;background:#f4f4f8}.attempt-correct{color:var(--correct);background:#ecfdf3}.attempt-incorrect{color:var(--incorrect);background:#fef1f4}.result-card{display:flex;flex-direction:column;gap:16px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:20px}.result-headline{margin:0;font-size:22px;font-weight:700;text-align:center}.result-win{color:var(--correct)}.result-lose{color:var(--incorrect)}.result-answer{margin:0;text-align:center;font-size:16px}.result-score{margin:0;text-align:center;font-size:28px;font-weight:700;color:var(--accent-dark)}.result-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.result-actions .submit{flex:1 1 200px}.result-row-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px}.result-row{border:1px solid var(--border);border-radius:12px;padding:12px;background:#fafafe}.result-row-correct{border-color:#bbf7d0}.result-row-incorrect{border-color:#fecdd3}.result-row-head{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);margin-bottom:6px}.result-row-mark{font-weight:700}.result-row-question{margin:0 0 4px;font-weight:600}.result-row-answer,.result-row-correct-answer{margin:0;font-size:14px}.result-row-correct-answer{color:var(--incorrect)}.history-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.history-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:16px}.history-card-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;font-size:13px;color:var(--muted)}.history-mode-badge{padding:2px 10px;border-radius:999px;background:var(--bg-1);color:var(--accent-dark);font-weight:600}@media(max-width:480px){.result-actions .submit{flex:1 1 100%}}