.chess-page{max-width:1448px;margin:auto;padding:20px 24px 0;color:var(--portal-text);font-family:system-ui,sans-serif}
.chess-page-title{font-size:clamp(23px,3vw,34px);line-height:1.2;margin:0 0 20px;color:var(--portal-text);-webkit-text-fill-color:var(--portal-text)}
.chess-guide{max-width:1080px;margin:40px auto;color:var(--portal-text);font-size:16px;line-height:1.8}
.chess-guide section{margin:32px 0;scroll-margin-top:20px}
.chess-guide h2,.chess-guide h3{line-height:1.3;color:var(--portal-text);-webkit-text-fill-color:var(--portal-text)}
.chess-guide h2{font-size:clamp(23px,3vw,30px)}.chess-guide h3{font-size:21px}
.chess-guide p{color:var(--portal-muted)}.chess-guide strong{color:var(--portal-text)}
.chess-guide a{color:var(--portal-link);text-underline-offset:3px}
.chess-toc{display:block;background:var(--portal-panel);border:1px solid var(--portal-line);border-radius:14px;padding:20px}
.chess-toc ul{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 26px;margin-bottom:0;padding-left:20px;font-size:14px}
.chess-guide figure{margin:24px 0 30px;max-width:960px}
.chess-guide figure img{width:100%;height:auto;border-radius:14px;border:1px solid var(--portal-line)}
.chess-guide figcaption{font-size:13px;line-height:1.5;color:var(--portal-muted);margin-top:7px}
.chess-guide figcaption small{display:block;margin-top:4px}

#chess-frame{display:block;width:100%;border:0;border-radius:14px;background:#070b22}
#chess-frame.chess-focus{position:fixed;inset:0;width:100vw;height:100vh!important;height:100dvh!important;z-index:2147483000;border-radius:0}
.chess-guide nav{background:var(--portal-panel);border:1px solid var(--portal-line);border-radius:14px;padding:20px}.chess-guide nav ul{columns:2;list-style:none;padding:0}.chess-guide nav li{break-inside:avoid;margin-bottom:8px;font-size:14px}
.chess-guide [id]{scroll-margin-top:24px}.chess-guide figure img{display:block;max-width:100%;height:auto}.chess-guide .faq-item{margin:24px 0}
@media(max-width:760px){.chess-page{padding:14px 12px 0}.chess-guide{font-size:15px}.chess-guide nav ul{columns:1}}