:root{
  --paper:#fafafa;
  --sheet:#fff;
  --ink:#1c1c1c;
  --muted:#5c5c5c;
  --faint:#8a8a8a;
  --line:#d5d5d5;
  --red:#b83d29;
  --red-hover:#9d3220;
  font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  color:var(--ink);
  background:var(--paper);
  font-synthesis:none;
  font-size:14px;
}
*{box-sizing:border-box}
body{margin:0}
button,input,textarea{font:inherit;color:inherit}
button,a,input,label{-webkit-tap-highlight-color:transparent}
button{cursor:pointer}
button:disabled{cursor:not-allowed;opacity:.42}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,.drop-zone:focus-within{outline:2px solid var(--red);outline-offset:3px}
button:hover:not(:disabled){background-color:var(--red-hover)}
[hidden]{display:none!important}

.masthead{max-width:1280px;margin:auto;padding:18px 44px;display:flex;align-items:center;border-bottom:1px solid var(--line);background:var(--sheet)}
.brand{color:inherit;text-decoration:none;font-size:18px;font-weight:700;display:flex;align-items:center;gap:8px}
.brand-mark{color:var(--ink);font-size:22px;font-family:"Hiragino Mincho ProN","Yu Mincho",serif;line-height:1}

main{max-width:1192px;margin:0 auto;padding:28px 0 0}
.howto{display:flex;align-items:flex-start;gap:36px;margin:0 0 22px;padding:0 0 18px;list-style:none;border-bottom:1px solid var(--line)}
.howto li{flex:1;position:relative;min-width:0;font-size:12px;line-height:1.7;color:var(--muted)}
.howto li+li::before{content:"→";position:absolute;top:0;left:-26px;width:16px;height:calc(14px * 1.4);display:flex;align-items:center;justify-content:center;color:var(--ink);font-size:16px;line-height:1}
.howto strong{display:block;color:var(--ink);font-size:14px;line-height:1.4;margin:0 0 2px}
.howto li>span{display:block}
.workspace{display:grid;grid-template-columns:310px minmax(0,1fr);gap:20px}
.card{background:var(--sheet);border:1px solid var(--line);border-radius:2px;padding:20px}
.section-label{font-size:15px;font-weight:700;margin:0 0 8px}
.color-label{margin-top:16px}
input[type=color]{display:block;width:100%;height:36px;margin:8px 0 0;padding:3px;border:1px solid var(--line);background:#fff;cursor:pointer}
.section-note{font-size:12px;line-height:1.7;color:var(--muted);margin:0 0 16px}

.drop-zone{border:1px dashed var(--line);border-radius:2px;display:flex;align-items:center;flex-direction:column;text-align:center;padding:22px 8px 16px;background:var(--sheet);position:relative;cursor:pointer}
.drop-zone.drag-over{border-color:var(--red);background:#fff6f4}
.drop-zone svg{color:var(--muted);margin-bottom:10px}
.drop-zone strong{font-size:13px;font-weight:600}
.drop-zone>span{font-size:12px;margin-top:6px;color:var(--muted)}
.drop-zone small{font-size:11px;color:var(--faint);margin-top:14px}
.drop-zone input{position:absolute;inset:0;opacity:0;width:100%;height:100%;cursor:pointer}
.drop-zone:has(input:disabled){opacity:.55;cursor:wait}
.drop-zone input:disabled{cursor:not-allowed}
.engine-status{font-size:12px;color:var(--red);line-height:1.7;overflow-wrap:anywhere;margin:0 0 12px}

.settings{margin-top:16px}
.setting-label{display:flex;justify-content:space-between;align-items:center;font-size:13px}
.setting-label output{border:1px solid var(--line);border-radius:2px;padding:2px 6px;font-size:12px;color:var(--ink)}
input[type=range]{width:100%;accent-color:var(--red);margin:16px 0 4px;height:4px}
.range-labels{display:flex;justify-content:space-between;font-size:11px;color:var(--faint)}
.accuracy,.render-mode-note{font-size:12px;color:var(--muted);line-height:1.7;margin:14px 2px 0}

.preview-panel{background:var(--sheet);border:1px solid var(--line);border-radius:2px;overflow:hidden;display:flex;flex-direction:column;min-width:0}
.preview-toolbar{height:52px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;border-bottom:1px solid var(--line);background:var(--sheet)}
.preview-title{font-size:14px;font-weight:700}
.zoom-control{display:flex;align-items:center;gap:8px}
.zoom-control button,.pagination button{background:transparent;border:0;color:var(--ink);width:28px;height:28px;border-radius:2px}
.zoom-control button:hover:not(:disabled),.pagination button:hover:not(:disabled){background:#f0f0f0}
.zoom-control output{font-size:12px;min-width:36px;text-align:center;color:var(--muted)}
.preview-viewport{
  background-color:#fff;
  flex:1;min-height:500px;max-height:800px;overflow:auto;position:relative;padding:28px 20px;display:flex;align-items:flex-start
}
.empty-state{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:24px}
.empty-state .drop-zone{width:min(280px,100%);background:var(--red);border:1px solid var(--red);color:#fff}
.empty-state .drop-zone svg,.empty-state .drop-zone>span,.empty-state .drop-zone small{color:inherit}
.empty-state .drop-zone>span,.empty-state .drop-zone small{opacity:.9}
.empty-state .drop-zone:hover:has(input:not(:disabled)),.empty-state .drop-zone.drag-over{background:var(--red-hover)}
.preview-wait{position:absolute;inset:0;z-index:1;display:flex;align-items:center;justify-content:center;pointer-events:none}
.spinner{width:32px;height:32px;border:2px solid #e4e4e4;border-top-color:var(--red);border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@media(prefers-reduced-motion:reduce){.spinner{animation:none;border-color:var(--red)}}
.preview-footer{min-height:60px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;border-top:1px solid var(--line);background:var(--sheet)}
.pagination{display:flex;align-items:center;gap:10px}
.pagination span{font-size:13px;color:var(--ink)}
.download-button{border:1px solid var(--line);border-radius:2px;background:var(--sheet);display:flex;align-items:center;gap:8px;padding:9px 12px;font-size:13px;color:var(--ink)}
.download-button:hover:not(:disabled){background:#f3f3f3}
.download-button.download-ready{background:var(--red);border-color:var(--red);color:#fff;padding:11px 16px;font-weight:700}
.download-button.download-ready:hover:not(:disabled){background:var(--red-hover)}
.download-button.download-ready:disabled{opacity:.55}
.download-notice{margin:0;padding:12px 16px;background:#fff;color:var(--red);font-size:12px;line-height:1.7;border-top:1px solid var(--line)}
.preview-footer:has(.download-ready){min-height:72px}
#score-image{display:block;max-width:none;flex-shrink:0;background:#fff;margin:0 auto}

.status-panel{padding:14px 16px;background:var(--sheet);border-bottom:1px solid var(--line)}
.status-line{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:var(--ink)}
.status-line strong{font-weight:700}
.status-panel progress{width:100%;height:4px;accent-color:var(--red);margin-top:8px}
.error-message,.page-message{padding:12px 16px;font-size:13px;line-height:1.7;background:#fff;color:var(--red);overflow-wrap:anywhere;border-bottom:1px solid var(--line)}
.page-message{color:var(--ink)}
.layout-retry-row:has(button[hidden]){display:none}
.layout-retry-row{padding:10px 16px;background:var(--sheet);border-bottom:1px solid var(--line)}
.layout-retry{background:var(--sheet);color:var(--red);border:1px solid var(--red);border-radius:2px;padding:8px 16px;font-size:13px}
.layout-retry:hover:not(:disabled){background:#fff6f4}

.feedback{margin:24px 0 36px;background:var(--sheet);border:1px solid var(--line);border-radius:2px;padding:18px 20px 16px}
.feedback h2{margin:0 0 12px;font-size:15px;font-weight:700}
.feedback form{display:flex;flex-direction:column;gap:12px}
.feedback textarea{display:block;width:100%;min-height:120px;resize:vertical;border:1px solid var(--line);border-radius:2px;background:#fff;padding:12px;color:inherit;line-height:1.7}
.feedback-row{display:flex;align-items:center;justify-content:flex-end;gap:16px;margin:0}
.feedback-row button{border:0;border-radius:2px;background:var(--red);color:#fff;padding:10px 18px;font-size:13px}
.feedback-status{margin:0 auto 0 0;font-size:13px;color:var(--ink)}
.feedback-status.error{color:var(--red)}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

@media(max-width:1250px){main{margin:0 24px}}
@media(max-width:760px){
  .masthead{padding:16px 18px}
  main{margin:0 16px;padding-top:20px}
  .howto{flex-direction:column;align-items:stretch;gap:16px}
  .howto li+li{display:grid;grid-template-columns:16px minmax(0,1fr);column-gap:8px;align-items:center}
  .howto li+li::before{position:static;grid-row:1;grid-column:1;left:auto;top:auto}
  .howto li+li strong{grid-row:1;grid-column:2}
  .howto li+li>span{grid-row:2;grid-column:2}
  .workspace{grid-template-columns:1fr;gap:16px}
  .sidebar{display:grid;grid-template-columns:1fr;gap:12px}
  .card{padding:16px}
  .settings{margin-top:0}
  .accuracy,.render-mode-note{grid-column:1/-1;margin:0}
  .preview-viewport{min-height:380px;padding:18px 12px}
  .preview-toolbar,.preview-footer{padding-left:12px;padding-right:12px}
}
@media(max-width:430px){
  .sidebar{grid-template-columns:1fr}
  .preview-viewport{min-height:320px}
}

.hand-colors{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:16px}.hand-colors label{font-size:13px}.hand-color-note{font-size:11px;color:var(--muted);line-height:1.6;margin:8px 0 0}

.billing-panel{margin:0 0 22px;padding:22px;border:1px solid var(--line,#ddd);border-radius:14px;background:#fff}.billing-panel h2{font-size:1.1rem;margin:0 0 12px}.billing-panel p{font-size:.9rem;line-height:1.7}.account-form{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:12px}.account-form input{font:inherit;padding:9px 12px;border:1px solid #bbb;border-radius:6px;max-width:100%;min-width:0}.billing-panel button,.billing-start button{font:inherit;padding:10px 14px;border:1px solid #aaa;border-radius:7px;background:#fff;cursor:pointer}.billing-panel button:disabled,.billing-start button:disabled{opacity:.5;cursor:default}.account-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.billing-start{display:flex;align-items:center;gap:16px;justify-content:space-between;margin-bottom:18px}.billing-start span{overflow-wrap:anywhere}.billing-start button,#purchase{background:var(--red);color:white;border-color:var(--red)}.legal-links{display:flex;gap:16px;flex-wrap:wrap;font-size:.8rem;margin-top:20px}.account-form[hidden],.billing-start[hidden],.legal-links[hidden]{display:none}

.billing-panel button:hover:not(:disabled),.billing-start button:hover:not(:disabled){background:var(--red-hover);color:#fff}

.service-info{max-width:760px;margin:40px auto;padding:20px;line-height:1.85}.service-info h1{font-size:1.6rem;margin-bottom:24px}.service-info h2{font-size:1.1rem;margin-top:28px}.service-info p{margin:12px 0}.service-info section{scroll-margin-top:20px}