:root{color-scheme:light;--ink:#172033;--muted:#667085;--line:#d9e0ea;--blue:#1769e0;--blue-dark:#0e4fab;--soft:#eef5ff;--ok:#087a4b;--bad:#b42318;--radius:18px;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif}
*{box-sizing:border-box}
body{margin:0;background:#f5f7fb;color:var(--ink);line-height:1.6;-webkit-text-size-adjust:100%}
button,input,select{font:inherit}
.shell{width:min(100% - 32px,680px);margin:0 auto;padding:38px 0 calc(28px + env(safe-area-inset-bottom))}
header{text-align:center;margin-bottom:26px}.eyebrow{color:var(--blue);font-weight:700;font-size:.85rem;margin:0 0 6px}.lead{color:var(--muted);margin:8px 0 0}h1{font-size:clamp(1.65rem,6vw,2.4rem);line-height:1.25;margin:0;letter-spacing:-.025em}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin:16px 0;box-shadow:0 5px 24px rgba(24,39,75,.05)}
h2{font-size:1.08rem;margin:0 0 16px;display:flex;align-items:center;gap:9px}h2 span{display:grid;place-items:center;background:var(--soft);color:var(--blue);border-radius:50%;width:28px;height:28px;font-size:.9rem}
.file-picker{display:flex;min-height:112px;border:2px dashed #9bb8e2;border-radius:14px;align-items:center;justify-content:center;flex-direction:column;cursor:pointer;background:#f8fbff;color:var(--blue);transition:.15s}.file-picker:active{background:var(--soft)}.file-picker small{color:var(--muted);font-size:.8rem}.hint,.custom-size small{color:var(--muted);font-size:.78rem;margin:8px 0 0}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.visually-hidden:focus+.file-info{outline:3px solid #8bb9ff}
.file-info{display:flex;gap:12px;align-items:center;margin-top:14px}.file-meta{min-width:0;flex:1}.file-info strong,.file-info span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-info span{color:var(--muted);font-size:.85rem}.thumb-wrap{width:58px;height:58px;border-radius:10px;overflow:hidden;background:#eee;flex:none}.thumb-wrap img{width:100%;height:100%;object-fit:cover}.remove-file{min-width:48px;min-height:44px;padding:0 10px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--muted);font-weight:700;cursor:pointer;flex:none}.remove-file:active{background:#f2f4f7}.remove-file:focus-visible{outline:3px solid #b6d2fa;border-color:var(--blue)}
.presets{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.preset{min-height:48px;border:1px solid var(--line);border-radius:11px;background:#fff;color:var(--ink);font-weight:700;cursor:pointer}.preset.selected{border-color:var(--blue);background:var(--soft);color:var(--blue);box-shadow:inset 0 0 0 1px var(--blue)}
.custom-size{margin-top:18px}.custom-size label{font-weight:700;font-size:.9rem}.input-row{display:grid;grid-template-columns:1fr 92px;gap:8px;margin-top:5px}.input-row input,.input-row select{width:100%;min-height:48px;border:1px solid #b9c3d0;border-radius:10px;background:#fff;padding:8px 12px;font-size:16px}.input-row input:focus,.input-row select:focus{outline:3px solid #b6d2fa;border-color:var(--blue)}
.notice{background:#fff8e6;color:#664d03;border-radius:10px;padding:10px 12px;font-size:.82rem;margin:16px 0 0}
.primary,.download{display:flex;align-items:center;justify-content:center;width:100%;min-height:56px;border:0;border-radius:14px;background:var(--blue);color:#fff;font-weight:800;font-size:1.05rem;text-decoration:none;cursor:pointer;box-shadow:0 5px 14px rgba(23,105,224,.23)}.primary:active,.download:active{background:var(--blue-dark)}.primary:disabled{opacity:.6;cursor:wait}
.message{padding:13px 15px;border-radius:12px;margin:14px 0}.error{background:#fff0ee;color:var(--bad);border:1px solid #f4b4ad}.working{background:var(--soft);color:var(--blue);text-align:center}.spinner{display:inline-block;width:16px;height:16px;border:2px solid #b6d2fa;border-top-color:var(--blue);border-radius:50%;vertical-align:-3px;margin-right:7px;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.result{border-color:#9dd7bd}.result .success{background:#ecfdf3;color:var(--ok);font-weight:800;border-radius:10px;padding:10px 12px}.result dl{margin:16px 0}.result dl div{display:flex;justify-content:space-between;gap:16px;border-bottom:1px solid #edf0f4;padding:10px 0}.result dt{color:var(--muted)}.result dd{font-weight:700;text-align:right;margin:0;overflow-wrap:anywhere}.download{margin-top:18px}
footer{text-align:center;color:var(--muted);font-size:.78rem;margin-top:24px}
[hidden]{display:none!important}
@media(min-width:560px){.shell{padding-top:55px}.card{padding:26px}.presets{grid-template-columns:repeat(5,1fr)}}
@media(prefers-reduced-motion:reduce){.spinner{animation:none}}