:root{--bg:#f4f6f8;--card:#fff;--text:#111827;--muted:#6b7280;--line:#e5e7eb;--accent:#2563eb;--accent2:#1d4ed8;--soft:#eff6ff;--shadow:0 14px 35px rgba(15,23,42,.08)}
:root.dark{--bg:#0b1020;--card:#121a2c;--text:#eef2ff;--muted:#9ca3af;--line:#263149;--accent:#60a5fa;--accent2:#3b82f6;--soft:#16233d;--shadow:0 14px 35px rgba(0,0,0,.25)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,"Noto Sans JP",system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.65}.topbar{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100% - 1100px)/2));background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.brand{display:flex;align-items:center;gap:12px}.brand small{display:block;color:var(--muted);font-size:11px}.logo{width:38px;height:38px;border-radius:10px;background:var(--text);color:var(--card);display:grid;place-items:center;font-weight:900}.ghost{border:1px solid var(--line);background:transparent;color:var(--text);border-radius:10px;padding:9px 13px;cursor:pointer}.wide{width:100%;margin-top:12px}main{max-width:1100px;margin:auto;padding:46px 20px 70px}.hero{text-align:center;max-width:760px;margin:0 auto 32px}.hero h1{font-size:clamp(30px,5vw,54px);line-height:1.12;margin:13px 0}.hero p{color:var(--muted);font-size:17px}.badge{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.12em;background:var(--soft);color:var(--accent);padding:6px 10px;border-radius:999px}.card{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}.workspace{padding:22px}.dropzone{min-height:310px;border:2px dashed var(--line);border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;cursor:pointer;transition:.2s}.dropzone:hover,.dropzone.drag{border-color:var(--accent);background:var(--soft)}.dropzone h2{margin:10px 0 2px}.dropzone p,.dropzone small{color:var(--muted);margin:0}.dropicon{width:58px;height:58px;border-radius:50%;display:grid;place-items:center;background:var(--soft);color:var(--accent);font-size:34px}.hidden{display:none!important}.editor{display:grid;grid-template-columns:minmax(260px,1fr) minmax(330px,1.25fr);gap:28px}.previewPane{min-width:0}.previewPane img{display:block;width:100%;height:360px;object-fit:contain;background:repeating-conic-gradient(#eee 0 25%,#fff 0 50%) 50%/20px 20px;border-radius:14px;border:1px solid var(--line)}:root.dark .previewPane img{background:#0a0f1c}.filemeta{padding:10px 2px}.filemeta strong,.filemeta span{display:block;overflow:hidden;text-overflow:ellipsis}.filemeta span{color:var(--muted);font-size:13px}.tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;background:var(--bg);padding:5px;border-radius:12px;margin-bottom:20px}.tab{border:0;background:transparent;color:var(--muted);padding:9px 5px;border-radius:9px;cursor:pointer;font-size:12px}.tab.active{background:var(--card);color:var(--text);font-weight:700;box-shadow:0 2px 8px rgba(0,0,0,.08)}.panel{display:none}.panel.active{display:block}.panel h3{margin-top:0}.panel label{display:block;font-weight:650;font-size:13px;margin:14px 0}.panel input[type=number],.panel select{width:100%;padding:11px;border-radius:9px;border:1px solid var(--line);background:var(--card);color:var(--text);margin-top:5px}.inline{display:grid;grid-template-columns:1fr 100px;gap:8px}.twocol{display:grid;grid-template-columns:1fr 1fr;gap:12px}.check{display:flex!important;align-items:center;gap:8px}.panel input[type=range]{width:100%;accent-color:var(--accent)}.hint{font-size:12px;color:var(--muted)}.primary{border:0;border-radius:11px;padding:12px 18px;background:var(--accent);color:white;font-weight:800;cursor:pointer}.primary:hover{background:var(--accent2)}.process{width:100%;margin-top:14px}.primary:disabled{opacity:.5;cursor:wait}.result{margin-top:18px;padding:20px 24px;display:flex;justify-content:space-between;align-items:center;gap:18px}.result h2{margin:4px 0}.result p{margin:0;color:var(--muted)}.success{color:#16a34a;font-size:12px;font-weight:800}.features{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:28px 0}.features article{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:17px}.features p{color:var(--muted);font-size:13px;margin-bottom:0}.info{padding:24px;margin-top:18px}.info p{color:var(--muted)}footer{text-align:center;color:var(--muted);padding:25px;font-size:12px;border-top:1px solid var(--line)}@media(max-width:760px){.topbar{padding:0 16px}.brand small{display:none}main{padding-top:28px}.editor{grid-template-columns:1fr}.previewPane img{height:260px}.tabs{grid-template-columns:1fr 1fr}.features{grid-template-columns:1fr 1fr}.result{align-items:stretch;flex-direction:column}.result .primary{width:100%}}@media(max-width:430px){.features{grid-template-columns:1fr}.workspace{padding:12px}.twocol{grid-template-columns:1fr 1fr}}