:root{color-scheme:light}
*{box-sizing:border-box}
body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial;background:#fafafa;color:#111}
.wrap{max-width:1100px;margin:24px auto;padding:0 16px}
.card{background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:16px;box-shadow:0 1px 2px rgba(0,0,0,.04);margin-bottom:12px}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.head{justify-content:space-between;margin-bottom:8px}
.title{font-size:20px;font-weight:700;margin:0 0 8px}
.title.sm{font-size:16px}
.btn{border:1px solid #e5e7eb;background:#fff;border-radius:12px;padding:8px 12px;cursor:pointer;text-decoration:none;color:#111}
.btn:hover{box-shadow:0 2px 8px rgba(0,0,0,.08)}
.muted{color:#6b7280}
.tiny{font-size:11px}
.tip{margin-top:8px;font-size:12px}
.canvas{width:100%;aspect-ratio:16/9;background:#f3f4f6;border:1px dashed #e5e7eb;border-radius:16px;overflow:hidden}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px}
.mt8{margin-top:8px}.mt12{margin-top:12px}
.jc-between{justify-content:space-between}
input[type="file"]{direction:ltr}