:root{font-family:"Segoe UI","Microsoft YaHei",sans-serif;color:#2d435a;background:#eef5fc;font-size:14px}
*{box-sizing:border-box}body{margin:0}a{color:#286996;text-underline-offset:3px}
header{display:flex;justify-content:space-between;align-items:center;padding:20px 28px;background:white;border-bottom:1px solid #cdddea}
.brand{font-weight:700;font-size:19px;text-decoration:none}main{max-width:1680px;margin:auto;padding:20px 28px 36px}
h1{margin:10px 0;font-size:29px}h1 span{font-weight:400;color:#71869b}h2{font-size:17px;margin:0 0 18px}p{line-height:1.65}
nav{display:flex;flex-wrap:wrap;gap:10px 24px;padding:12px 0}.note,.description{font-size:12px;color:#617b90}.description{min-height:36px}
code,textarea,pre{font-family:Consolas,monospace}code{overflow-wrap:anywhere}.workspace{display:grid;grid-template-columns:minmax(310px,390px) minmax(0,1fr);gap:20px;margin-top:20px}
section{background:#fff;border:1px solid #c7dbee;border-radius:12px;padding:20px;min-width:0}
label{display:block;font-weight:600;margin:14px 0 8px}select,textarea,button{font:inherit;color:inherit;border:1px solid #bdd1e2;border-radius:7px;background:white}
select,textarea{width:100%;padding:10px}textarea{font-family:Consolas,monospace;resize:vertical;font-size:12px;line-height:1.5;min-height:138px}
#result{min-height:240px;background:#f5f9fd}button{padding:10px 22px;color:white;background:#397bac;cursor:pointer}button:disabled{opacity:.45;cursor:default}
button:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #74b6d4;outline-offset:2px}
#status{font-size:12px;color:#286996}details{margin-top:16px}summary{cursor:pointer}pre{font-size:11px;white-space:pre-wrap;overflow-wrap:anywhere}
.preview{padding:20px 0 0}.preview h2{padding:0 20px}iframe{display:block;width:100%;height:810px;border:0;border-radius:0 0 12px 12px}
@media(max-width:1000px){.workspace{grid-template-columns:1fr}.console{order:0}.preview{order:1}iframe{height:850px}main{padding:16px}header{padding:18px 16px}}
@media(max-width:480px){header{font-size:12px}.brand{font-size:17px}h1{font-size:25px}section{padding:16px}.preview{padding:16px 0 0}iframe{height:820px}}