:root{--navy: #1f3864;--navy-light: #2e5496;--border: #d5dcea;--bg: #f4f6fa;--surface: #ffffff;--text: #1a1a1a;--text-muted: #5f6b7f;--correct: #1b7f4b;--correct-bg: #e6f4ec;--wrong: #b3261e;--wrong-bg: #fdeceb;--hint: #8a5a00;--hint-bg: #fdf3e0;--radius: 12px;--tap-min: 48px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Hiragino Sans,Noto Sans JP,Yu Gothic,Meiryo,sans-serif;font-size:16px;line-height:1.6;-webkit-text-size-adjust:100%;overflow-wrap:anywhere}.app{min-height:100dvh;padding-bottom:calc(24px + env(safe-area-inset-bottom))}.main{max-width:640px;margin:0 auto;padding:12px 12px 0;display:flex;flex-direction:column;gap:12px}.main__loading,.main__empty,.main__note,.main__owner-note{margin:0;padding:8px 4px;color:var(--text-muted);font-size:14px;text-align:center}.main__note{background:var(--surface);border:1px dashed 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8px;border-radius:999px;background:#ffd9d6;color:#8c1d18}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.card--solved{border-color:#a8d5bd;background:var(--correct-bg)}.card__head{width:100%;min-height:var(--tap-min);display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px;background:none;border:0;font:inherit;color:inherit;text-align:left;cursor:pointer}.card__head-main{min-width:0}.card__label{display:block;font-size:17px;font-weight:700}.card__meta{display:block;font-size:12px;color:var(--text-muted)}.badge{flex-shrink:0;font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px}.badge--open{background:#e8ecf5;color:var(--navy-light)}.badge--solved{background:var(--correct);color:#fff}.card__body{padding:12px 12px 14px;border-top:1px solid var(--border)}.card__solved-note,.card__blocked-note,.card__attempts{margin:0 0 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transparent;font:inherit;font-size:16px;font-weight:700;cursor:pointer}.btn:disabled{opacity:.55;cursor:not-allowed}.btn--block{display:flex;align-items:center;justify-content:center;gap:8px;width:100%}.btn--primary{background:var(--navy);color:#fff}.btn--outline{background:#fff;border-color:var(--border);color:var(--navy-light)}.btn--ghost{background:transparent;color:var(--text-muted)}.btn--danger{background:var(--wrong);color:#fff}.hints{margin-top:14px;padding-top:12px;border-top:1px dashed var(--border)}.hints__title{margin:0 0 8px;font-size:13px;color:var(--text-muted)}.hints__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.hint{padding:10px 12px;border-radius:10px}.hint--opened{background:var(--hint-bg);border:1px solid #e8d3a8}.hint__label{margin:0 0 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