:root{
  --bg:#f5f6f8;--card:#fff;--text:#111827;--muted:#6b7280;--border:#e5e7eb;--primary:#111827;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif}
.wrap{max-width:1100px;margin:0 auto;padding:20px 16px}
.topbar{background:#fff;border-bottom:1px solid var(--border)}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;gap:12px}
.brand{font-weight:700;color:var(--text);text-decoration:none}
.nav{display:flex;gap:10px}
.nav a{color:var(--muted);text-decoration:none;padding:8px 10px;border-radius:10px}
.nav a:hover{background:#f9fafb;color:var(--text);border:1px solid var(--border)}
.hero{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;margin-bottom:14px}
.hero h1{margin:0;font-size:22px}
.hero p{margin:6px 0 0 0;color:var(--muted);font-size:13px}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px;margin-bottom:14px}
.grid{display:grid;grid-template-columns:1fr;gap:14px}
@media(min-width:980px){.grid{grid-template-columns:1fr 1fr}}
.muted{color:var(--muted);font-size:13px}
.textarea{width:100%;min-height:220px;resize:vertical;padding:10px;border:1px solid var(--border);border-radius:10px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px}
.input{padding:8px 10px;border:1px solid var(--border);border-radius:10px;outline:none}
.btn{padding:9px 12px;border-radius:10px;border:1px solid var(--primary);background:var(--primary);color:#fff;cursor:pointer;font-size:13px}
.btn:hover{filter:brightness(.95)}
.btn-ghost{background:#fff;color:var(--text);border:1px solid var(--border)}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:10px}
.between{justify-content:space-between}
.pre{white-space:pre-wrap;background:#0b1020;color:#e5e7eb;border-radius:10px;padding:12px;margin:0;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px;min-height:140px}
.filter{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end}
.item{border:1px solid var(--border);border-radius:12px;padding:12px;margin-top:10px;background:#fff}
.footer{color:var(--muted);font-size:12px;text-align:center;padding:18px 0}
code{background:#f3f4f6;padding:2px 6px;border-radius:6px;border:1px solid var(--border)}