html,body{overscroll-behavior:none;height:100%;margin:0;padding:0;overflow:hidden}body{-webkit-overflow-scrolling:touch;background:#f5f5f5;font-family:system-ui,sans-serif;overflow-y:auto}.app{padding-top:calc(16px + env(safe-area-inset-top));max-width:500px;padding-left:16px;padding-right:16px;padding-bottom:env(safe-area-inset-bottom);margin:0 auto}.title{text-align:center;margin-bottom:16px;font-size:28px}.scan-input{box-sizing:border-box;border:1px solid #ddd;border-radius:12px;outline:none;width:100%;padding:14px 12px;font-size:18px}.card{background:#fff;border-radius:16px;margin-top:16px;padding:20px;box-shadow:0 4px 12px #0000001a}.book-title{text-align:center;margin-bottom:10px;font-size:22px;font-weight:700}.meta{color:#666;text-align:center;margin-bottom:10px;font-size:16px}.offer{text-align:center}.price{color:#2e7d32;text-align:center;font-size:24px;font-weight:700}.no-offer{color:#fd0000;text-align:center;font-size:24px}.history{-webkit-overflow-scrolling:touch;touch-action:pan-y;max-height:50vh;margin-top:20px;overflow-y:auto}.history-title{color:#333;text-align:center;margin-bottom:10px;font-size:18px}.history-item{background:#fff;border-radius:12px;margin-bottom:10px;padding:12px;box-shadow:0 2px 6px #00000014}.h-title{text-align:center;font-size:16px;font-weight:600}.h-isbn{color:#666;text-align:center;font-size:12px}.h-price{color:#2e7d32;text-align:center;font-size:14px}.top-bar{justify-content:space-between;align-items:center;display:flex}.settings-btn{cursor:pointer;background:0 0;border:none;font-size:20px}.settings-page{padding:20px}.vendor-item{cursor:pointer;-webkit-user-select:none;user-select:none;border:2px solid #0000;border-radius:10px;align-items:center;gap:12px;padding:10px 12px;transition:background .2s,transform 80ms;display:flex}.vendor-item:active{transform:scale(.98)}.vendor-item:hover{background:var(--accent-bg);border-color:var(--accent-border)}.vendor-item input{display:none}.checkbox-ui{border:2px solid var(--border);background:0 0;border-radius:6px;justify-content:center;align-items:center;width:20px;height:20px;transition:all .2s;display:inline-flex;position:relative}.vendor-item input:checked+.checkbox-ui{background:var(--accent);border-color:var(--accent);transform:scale(1.05)}.checkbox-ui:after{content:"";opacity:0;border:2px solid #000;border-width:0 2px 2px 0;width:5px;height:10px;transition:transform .18s cubic-bezier(.2,.9,.3,1.3),opacity .15s;position:absolute;transform:rotate(45deg)scale(0)}.vendor-item input:checked+.checkbox-ui:after{opacity:1;transform:rotate(45deg)scale(1)}.vendor-name{color:var(--text-h);font-size:14px}.back-btn{background:var(--accent-bg);min-height:44px;color:var(--text-h);cursor:pointer;-webkit-user-select:none;user-select:none;border:2px solid #000;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:12px 16px;font-size:15px;font-weight:600;transition:transform 80ms,background .2s,border-color .2s;display:inline-flex}.back-btn:hover{background:var(--accent-bg);filter:brightness(1.05)}.back-btn:active{transform:scale(.97)}.back-btn:focus-visible{outline:2px solid var(--accent);outline-offset:3px}