:root{--primary: #8899ff;--primary-dark: #6b7bcc;--primary-soft: #eef0ff;--secondary: #ff99cc;--bg: #fafbff;--card: #ffffff;--text: #1f2330;--muted: #6b7080;--line: #e3e6f2;--error: #d9534f;--error-soft: #fff1f0;--radius: 16px;color-scheme:light}@media(prefers-color-scheme:dark){:root{--primary: #9aa8ff;--primary-dark: #b7c1ff;--primary-soft: #262a3d;--bg: #14161e;--card: #1d2029;--text: #eef0f6;--muted: #a0a5b8;--line: #2e3242;--error: #ff7b76;--error-soft: #3a2426;color-scheme:dark}}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Hiragino Sans,Hiragino Kaku Gothic ProN,Noto Sans JP,Yu Gothic,Meiryo,sans-serif;font-size:16px;line-height:1.7;padding-bottom:env(safe-area-inset-bottom)}.sheet{max-width:560px;margin:0 auto;padding:16px 16px 40px}.brand{display:flex;align-items:center;gap:8px;padding:8px 4px 16px;font-weight:700;color:var(--primary-dark);letter-spacing:.02em}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px;margin-bottom:16px}.card.center{text-align:center;padding:40px 20px}h1{font-size:1.35rem;line-height:1.4;margin:0 0 12px}.lead{margin:0;white-space:pre-line}.hint{color:var(--muted);font-size:.85rem;margin:12px 0 0}.audience{display:inline-block;margin:0 0 12px;padding:2px 12px;border-radius:999px;background:var(--primary-soft);color:var(--primary-dark);font-size:.85rem;font-weight:600}.question{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:12px;transition:border-color .15s}.question.has-error{border-color:var(--error);background:var(--error-soft)}.question h2{font-size:1.05rem;line-height:1.5;margin:0 0 12px;display:flex;flex-wrap:wrap;align-items:baseline;gap:8px}.qnum{color:var(--primary-dark);font-weight:700;font-size:.9rem}.required,.optional{font-size:.72rem;font-weight:600;padding:1px 8px;border-radius:999px;margin-left:auto}.required{color:#fff;background:var(--secondary)}.optional{color:var(--muted);border:1px solid var(--line)}.help{margin:-6px 0 12px;color:var(--muted);font-size:.9rem}.options{display:flex;flex-direction:column;gap:8px}.option{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;cursor:pointer;-webkit-tap-highlight-color:transparent}.option:has(input:checked){border-color:var(--primary);background:var(--primary-soft)}.option input{width:20px;height:20px;margin:0;accent-color:var(--primary);flex-shrink:0}.other-wrap{margin-top:8px}textarea,.other-input{width:100%;font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px 14px;resize:vertical}textarea:focus,.other-input:focus{outline:2px solid var(--primary);outline-offset:1px;border-color:transparent}.counter{display:block;text-align:right;color:var(--muted);font-size:.8rem;margin-top:4px}.error{color:var(--error);font-size:.85rem;margin:8px 0 0;min-height:0}.error:empty{display:none}.actions{padding:8px 0 0;text-align:center}.form-error{margin-bottom:12px}button.primary{width:100%;font:inherit;font-size:1.05rem;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--primary),var(--secondary));border:0;border-radius:999px;padding:14px 20px;cursor:pointer;box-shadow:0 6px 18px #8899ff59}button.primary:disabled{opacity:.6;cursor:default;box-shadow:none}.reward-box{margin-top:16px;padding:14px 16px;border-radius:12px;background:var(--primary-soft);text-align:left}.reward-title{margin:0 0 8px;font-size:.85rem;font-weight:700;color:var(--primary-dark)}.rewards{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}.rewards li{display:flex;align-items:center;gap:10px;font-weight:600}.rewards img{width:32px;height:32px;border-radius:8px;object-fit:cover}.reward-dot{width:10px;height:10px;border-radius:50%;background:var(--secondary);margin:0 11px}.check{width:64px;height:64px;margin:0 auto 16px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;font-size:2rem;font-weight:700;display:flex;align-items:center;justify-content:center}.spinner{width:36px;height:36px;margin:0 auto;border:4px solid var(--line);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.foot{text-align:center;color:var(--muted);font-size:.8rem;padding:0 16px 32px}