:root{--bg: #f7f7f5;--surface: #ffffff;--line: #e3e2de;--text: #22201d;--text-weak: #6b6862;--accent: #2f6fd0;--accent-ink: #ffffff;--accent-weak: #eaf1fb;--disabled-bg: #ebeae7;--disabled-text: #8d8a84;--radius: 10px;--font: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif}*{box-sizing:border-box}[hidden]{display:none!important}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.7;font-size:15px}.site-header{max-width:1000px;margin:0 auto;padding:32px 16px 16px}.site-header h1{font-size:20px;margin:0;letter-spacing:.04em}.site-header p{margin:4px 0 0;color:var(--text-weak);font-size:14px}.layout{max-width:1000px;margin:0 auto;padding:8px max(16px,env(safe-area-inset-left)) 48px;display:grid;gap:24px;grid-template-columns:minmax(0,360px) minmax(0,1fr);align-items:start}@media (max-width: 800px){.layout{grid-template-columns:minmax(0,1fr)}}.preview{position:sticky;top:16px;display:grid;gap:16px}@media (max-width: 800px){.preview{position:static}#card{max-height:54vh;width:auto;margin:0 auto}.preview{display:none}body.has-image .preview{display:grid}}.card-frame{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px}#card{display:block;width:100%;height:auto;aspect-ratio:3 / 4;border-radius:4px;background:#e8eef5;touch-action:none;cursor:grab}#card.dragging{cursor:grabbing}.empty,.busy{position:absolute;top:12px;right:12px;bottom:12px;left:12px;display:grid;place-content:center;gap:10px;justify-items:center;border-radius:4px;color:var(--text-weak);font-size:14px;background:#e8eef5;text-align:center}.busy{background:#ffffffe0;color:var(--text)}.busy span{width:22px;height:22px;border-radius:50%;border:2px solid var(--line);border-top-color:var(--accent);animation:spin .8s linear infinite}@keyframes 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