:root{--bg:#fff;--bg-elev:#f6f8fa;--border:#d0d7de;--text:#1f2328;--muted:#59636e;--accent:#1f883d;--accent-hover:#1a7f37;--link:#0969da;--danger:#cf222e;--radius:10px}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif;line-height:1.5}a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}header{border-bottom:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:16px 24px;display:flex}header h1{margin:0;font-size:18px;font-weight:600}.subtitle{color:var(--muted);margin-top:2px;font-size:13px}.star-btn{background:var(--bg-elev);border:1px solid var(--border);color:var(--text);cursor:pointer;border-radius:8px;align-items:center;gap:8px;padding:8px 14px;font-size:14px;font-weight:600;display:inline-flex}.star-btn:hover{background:#eaeef2;border-color:#afb8c1;text-decoration:none}main{grid-template-columns:320px 1fr;gap:24px;max-width:1100px;margin:0 auto;padding:24px;display:grid}@media (width<=820px){main{grid-template-columns:1fr}}.panel{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.field{margin-bottom:16px}.field:last-child{margin-bottom:0}fieldset.field{border:0;min-width:0;margin:0 0 16px;padding:0}legend{padding:0}label,.field-label{margin-bottom:6px;font-size:13px;font-weight:600;display:block}.hint{color:var(--muted);font-size:12px;font-weight:400}input[type=text],input[type=date],select{background:var(--bg);border:1px solid var(--border);width:100%;color:var(--text);border-radius:8px;padding:8px 10px;font-family:inherit;font-size:14px}input:focus,select:focus{border-color:var(--link);outline:none;box-shadow:0 0 0 2px #0969da4d}input.invalid{border-color:var(--danger)}.error-text{color:var(--danger);min-height:16px;margin-top:6px;font-size:12px}.seg{gap:8px;display:flex}.seg label{text-align:center;border:1px solid var(--border);cursor:pointer;border-radius:8px;flex:1;margin:0;padding:8px;font-weight:500}.seg input{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.seg input:checked+span{color:var(--accent)}.seg label:has(input:checked){border-color:var(--accent);background:#1f883d1a}.seg label:has(input:focus-visible){outline:2px solid var(--link);outline-offset:2px}.types{grid-template-columns:1fr 1fr;gap:8px;display:grid}.types label{cursor:pointer;align-items:center;gap:8px;margin:0;font-weight:400;display:flex}.preview-box{border:1px solid var(--border);border-radius:var(--radius);background:repeating-conic-gradient(#eef1f4 0% 25%,#fff 0% 50%) 50%/24px 24px;justify-content:center;align-items:center;min-height:240px;margin-bottom:16px;padding:16px;display:flex}.preview-box img{max-width:100%;height:auto}.preview-status{color:var(--muted);font-size:14px}.preview-box img.is-loading{display:none}.preview-spinner{align-items:center;gap:10px;display:inline-flex}.spinner{border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;width:18px;height:18px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.snippet{margin-bottom:14px}.snippet-head{justify-content:space-between;align-items:center;margin-bottom:6px;display:flex}.snippet-label{font-size:13px;font-weight:600}.copy-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:7px;padding:5px 12px;font-size:13px;font-weight:600}.copy-btn:hover{background:var(--accent-hover)}.copy-btn:disabled{opacity:.5;cursor:not-allowed}textarea{background:var(--bg);border:1px solid var(--border);width:100%;color:var(--text);resize:vertical;border-radius:8px;min-height:52px;padding:10px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px}footer{text-align:center;color:var(--muted);border-top:1px solid var(--border);padding:24px;font-size:13px}