:root{--bg: #fafbfc;--surface: #ffffff;--ink: #111827;--ink-soft: #5b6478;--muted: #6b7280;--border: #e3e8f2;--brand: #4f46e5;--brand-hover: #4338ca;--success: #22c55e;--shadow-soft: 0 16px 36px rgba(15,23,42,.09);--shadow-card: 0 10px 24px rgba(15,23,42,.08);--font-ui: "Inter","Nunito","Noto Sans JP","Hiragino Sans","Yu Gothic",system-ui,sans-serif;--radius: 16px;--radius-sm: 10px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-family:var(--font-ui);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}body{min-height:100dvh}.page{max-width:720px;margin:0 auto;padding:0 16px 32px;display:flex;flex-direction:column;min-height:100dvh}.app-header{display:flex;align-items:center;justify-content:space-between;padding:16px 0;gap:12px;flex-wrap:wrap}.app-header-left{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.brand-mark{display:flex;align-items:center;gap:6px;text-decoration:none;color:var(--brand);font-weight:800;font-size:1rem}.brand-logo{width:28px;height:28px}.app-header-title{font-family:"Nunito",var(--font-ui);font-size:clamp(1.1rem,3vw,1.4rem);font-weight:800;color:var(--ink)}.locale-select-wrap{display:flex;align-items:center;gap:6px}.locale-select-label{font-size:.8rem;color:var(--muted)}.locale-select{font-family:var(--font-ui);font-size:.85rem;padding:6px 10px;border:1.5px solid var(--border);border-radius:8px;background:var(--surface);color:var(--ink);cursor:pointer;min-height:36px}.main-content{flex:1;display:flex;flex-direction:column;align-items:center;gap:16px;padding:8px 0}.total-display{display:flex;align-items:baseline;gap:8px}.total-label{font-size:1rem;color:var(--muted)}.total-value{font-family:"Nunito",var(--font-ui);font-size:3rem;font-weight:800;color:var(--brand)}.total-yen{font-size:1.2rem;font-weight:700;color:var(--ink-soft)}.challenge-bar{display:flex;flex-direction:column;align-items:center;gap:8px;padding:12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);width:100%;max-width:400px}.challenge-target{font-size:1.05rem;color:var(--ink-soft)}.challenge-target strong{color:var(--brand);font-size:1.2rem}.challenge-success{font-size:1.1rem;font-weight:800;color:var(--success);animation:pop-in .3s ease}.challenge-actions{display:flex;gap:8px}.challenge-btn{font-family:var(--font-ui);font-size:.85rem;font-weight:600;padding:8px 16px;border:1.5px solid var(--brand);border-radius:20px;background:var(--brand);color:#fff;cursor:pointer;min-height:36px;transition:all .15s ease}.challenge-btn:hover{background:var(--brand-hover)}.challenge-btn--secondary{background:var(--surface);color:var(--ink-soft);border-color:var(--border)}.challenge-btn--secondary:hover{border-color:var(--brand);color:var(--brand)}.challenge-start-btn{font-family:var(--font-ui);font-size:.95rem;font-weight:700;padding:10px 24px;border:2px solid var(--brand);border-radius:20px;background:var(--surface);color:var(--brand);cursor:pointer;min-height:44px;transition:all .15s ease}.challenge-start-btn:hover{background:var(--brand);color:#fff}.coin-area{width:100%;max-width:400px;min-height:100px;padding:16px;background:var(--surface);border:2px dashed var(--border);border-radius:var(--radius);display:flex;flex-direction:column;align-items:center;justify-content:center}.coin-area-empty{color:var(--muted);font-size:.95rem}.coin-area-grid{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}.coin-area-item{background:none;border:2px solid transparent;border-radius:50%;cursor:pointer;padding:2px;transition:all .15s ease}.coin-area-item:hover{border-color:#ef4444;transform:scale(1.1)}.coin-palette{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;width:100%;max-width:400px}.coin-palette-btn{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px;border:1.5px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);cursor:pointer;transition:all .15s ease;min-width:64px}.coin-palette-btn:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:var(--shadow-card)}.coin-palette-btn:active{transform:scale(.96)}.coin-palette-label{font-size:.7rem;font-weight:600;color:var(--ink-soft)}.clear-btn{font-family:var(--font-ui);font-size:.9rem;font-weight:600;padding:8px 20px;border:1.5px solid var(--border);border-radius:20px;background:var(--surface);color:var(--ink-soft);cursor:pointer;min-height:40px;transition:all .15s ease}.clear-btn:hover{border-color:#ef4444;color:#ef4444}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-soft)}.app-modal{width:100%;max-width:480px;max-height:80vh;overflow-y:auto;padding:24px;animation:pop-in .2s ease}.app-modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.app-modal-header h2{font-size:1.2rem;font-weight:700}.app-modal-close{font-family:var(--font-ui);font-size:.85rem;padding:6px 14px;border:1.5px solid var(--border);border-radius:8px;background:var(--surface);color:var(--muted);cursor:pointer}.app-modal-body{font-size:.95rem;line-height:1.7;color:var(--ink-soft)}.app-modal-body p{margin-bottom:12px}.app-modal-body ol{padding-left:1.5em}.app-modal-body li{margin-bottom:8px}.site-footer{margin-top:auto;padding:24px 0 16px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.site-footer-brand{display:flex;align-items:center;gap:12px}.site-footer-copy{font-size:.75rem;color:var(--muted)}.site-footer-links{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.site-footer-link,.site-footer-button{font-family:var(--font-ui);font-size:.8rem;color:var(--muted);text-decoration:none;background:none;border:none;cursor:pointer;padding:4px 0}.site-footer-link:hover,.site-footer-button:hover{color:var(--brand)}@keyframes pop-in{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}@media (max-width: 480px){.total-value{font-size:2.4rem}.coin-palette-btn{min-width:56px}.site-footer{flex-direction:column;align-items:flex-start}}