:root{--opc-blue:#000000;--opc-red:#ffd400;--opc-ink:#1f2530;--opc-muted:#687180;--opc-line:#e2e6ed;--opc-paper:#f5f6f8}
*{box-sizing:border-box}body.opc-community-body{margin:0;color:var(--opc-ink);background:var(--opc-paper);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7}.opc-skip{position:absolute;left:-9999px}.opc-skip:focus{left:20px;top:12px;background:#fff;padding:8px;z-index:10}.opc-site-head{height:72px;padding:0 max(24px,calc((100vw - 1180px)/2));display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid var(--opc-line)}.opc-brand{display:flex;align-items:center;color:var(--opc-blue);text-decoration:none}.opc-brand-logo{display:block;width:auto;height:52px}.opc-site-head nav{display:flex;gap:28px}.opc-site-head nav a{color:var(--opc-ink);text-decoration:none}.opc-site-head nav a:hover{color:#000}.opc-site-main{width:min(1180px,calc(100% - 40px));margin:44px auto 72px}.opc-content-card{background:#fff;border:1px solid var(--opc-line);border-radius:var(--radius);padding:clamp(24px,5vw,64px)}.opc-page-title{padding-bottom:24px;border-bottom:1px solid var(--opc-line);margin-bottom:32px}.opc-page-title p{font-size:12px;color:var(--opc-blue);letter-spacing:.16em;margin:0 0 12px}.opc-page-title h1{font-size:clamp(32px,5vw,48px);line-height:1.15;margin:0}.opc-entry{font-size:18px}.opc-entry a{color:var(--opc-blue)}.opc-list-item{padding:24px 0;border-top:1px solid var(--opc-line)}.opc-list-item h2{margin:0 0 8px}.opc-list-item a{color:var(--opc-ink);text-decoration:none}.opc-comments{margin-top:56px;padding-top:32px;border-top:1px solid var(--opc-line)}.comment-list{padding-left:0;list-style:none}.comment-list .comment{padding:20px 0;border-top:1px solid var(--opc-line)}.comment-meta{font-size:14px;color:var(--opc-muted)}.comment-form textarea,.comment-form input{width:100%;padding:12px;border:1px solid #cbd2dc;border-radius:var(--radius);font:inherit}.comment-form input[type=submit],.button,.bbp-submit-wrapper button{width:auto;background:var(--opc-blue);color:#fff;border:0;border-radius:var(--radius);padding:12px 24px;cursor:pointer}.opc-member-box{max-width:680px}.opc-member-box .muted,.comment-note{color:var(--opc-muted);font-size:14px}#bbpress-forums{font-size:16px!important}#bbpress-forums li.bbp-header{background:var(--opc-blue)!important;color:#fff!important;border:0!important}#bbpress-forums ul.bbp-forums,#bbpress-forums ul.bbp-topics{border:1px solid var(--opc-line)!important}
@media(max-width:700px){.opc-site-head{height:auto;padding:20px 20px;align-items:center}.opc-brand-logo{height:36px}.opc-site-head nav{gap:16px;font-size:14px;flex-wrap:wrap;justify-content:flex-end}.opc-site-main{width:min(100% - 24px,1180px);margin:20px auto 40px}.opc-content-card{padding:24px 20px;border-radius:var(--radius)}.opc-page-title h1{font-size:32px}}
.opc-entry .opc-member-box a.button{display:inline-block;background:#000000;color:#fff !important;text-decoration:none;border-radius:var(--radius);padding:12px 24px;line-height:1.4}
.opc-site-head{height:auto;min-height:72px;gap:28px;flex-wrap:wrap}
.opc-nav-panel{display:flex;align-items:center;gap:28px;flex:1}
.opc-nav-mine,.opc-nav-more{display:none}
.opc-head-actions{display:flex;align-items:center;gap:16px;margin-left:auto}
.opc-head-mine{color:var(--opc-ink);text-decoration:none}
.opc-head-mine:hover{color:#000}
.opc-head-button{display:inline-flex;background:#000;color:#fff !important;text-decoration:none;border-radius:var(--radius);padding:8px 16px;font-size:14px}
.opc-nav-panel a[aria-current="page"],.opc-head-mine[aria-current="page"]{box-shadow:inset 0 -2px 0 #000;font-weight:600}
.opc-nav-more summary{list-style:none;cursor:pointer;border:1px solid #111;border-radius:var(--radius);padding:8px 12px;font-size:14px}
.opc-nav-more summary::-webkit-details-marker{display:none}




@media(max-width:760px){.opc-site-head{height:auto;min-height:0;flex-wrap:wrap;align-items:center;gap:8px 12px;padding:12px 16px}.opc-site-head .opc-brand{flex:1 1 auto;min-width:0;order:1}.opc-site-head .opc-head-actions{order:2;margin-left:0}.opc-site-head .opc-head-mine{display:none}.opc-site-head .opc-nav-more{display:block;order:3}.opc-site-head .opc-nav-panel{display:none;order:4;flex:1 0 100%;width:100%;margin:0;flex-direction:column;align-items:stretch;justify-content:flex-start;gap:0;border-top:1px solid var(--opc-line)}.opc-site-head .opc-nav-more[open]+.opc-nav-panel{display:flex}.opc-site-head .opc-nav-panel a,.opc-site-head .opc-nav-more[open]+.opc-nav-panel a.opc-nav-mine{display:flex;align-items:center;width:100%;min-height:44px}}

/* design-system */
:root{--radius:8px;--control:44px;--control-sm:36px;--container:1180px;--gutter:24px;--edge:max(var(--gutter),calc((100vw - var(--container))/2));--field-line:#c9ccd3}
@media(max-width:760px){:root{--gutter:20px}}
body.opc-community-body{font-size:16px}
.opc-site-head{padding-left:var(--edge);padding-right:var(--edge)}
.opc-site-main{width:min(var(--container),calc(100% - var(--gutter)*2))}
.opc-head-button,.opc-nav-more summary{display:inline-flex;align-items:center;min-height:var(--control-sm);padding:0 16px;font-size:14px;font-weight:600;border-radius:var(--radius)}
.comment-form input[type=submit],.button,.bbp-submit-wrapper button,.opc-entry .opc-member-box a.button{display:inline-flex;align-items:center;justify-content:center;min-height:var(--control);padding:0 20px;font-size:14px;font-weight:600;line-height:1.2;border-radius:var(--radius)}
.comment-form textarea,.comment-form input{font-size:16px;border:1px solid var(--field-line);border-radius:var(--radius)}
.opc-content-card{padding:clamp(20px,4vw,48px);border-radius:var(--radius)}
@media(max-width:760px){.opc-site-head{padding:12px var(--gutter)}}

.bbp-search-form{float:right}
#bbp-search-form{display:flex;justify-content:flex-end;margin:0 0 16px}
#bbp-search-form>div{display:flex;align-items:stretch;width:min(100%,360px);min-height:var(--control);border:1px solid var(--field-line);border-radius:var(--radius);overflow:hidden;background:#fff}
#bbp-search-form #bbp_search{flex:1;min-width:0;height:var(--control);margin:0;padding:0 12px;border:0;border-radius:0;background:transparent;font:inherit;font-size:16px}
#bbp-search-form #bbp_search:focus{outline:none}
#bbp-search-form #bbp_search_submit{min-height:var(--control);height:var(--control);margin:0;padding:0 16px;border:0;border-left:1px solid var(--field-line);border-radius:0;background:#111;color:#fff;font-size:14px;font-weight:600}
#bbpress-forums ul.bbp-forums,#bbpress-forums ul.bbp-topics{border-radius:var(--radius);overflow:hidden}
#bbpress-forums li.bbp-header{border-radius:0!important}
@media(max-width:760px){#bbpress-forums{display:flex;flex-direction:column}#bbpress-forums .bbp-breadcrumb{float:none;order:1;margin:0 0 12px}#bbpress-forums div.bbp-search-form{float:none;order:2;width:100%}#bbpress-forums ul.bbp-forums,#bbpress-forums ul.bbp-topics{order:3}#bbp-search-form{margin:0 0 16px}#bbp-search-form>div{width:100%}}

/* site footer — 与主站 SPA footer 同源（2026-10-08 统一） */
.footer{background:#000;color:#fff;padding:34px var(--edge) 28px;display:grid;grid-template-columns:minmax(220px,1.1fr) minmax(0,2fr);gap:28px 40px;align-items:start}
.footer .footer-logo{height:46px;margin-bottom:12px;background:transparent}
.footer p{font-size:12px;color:rgba(255,255,255,.78);margin-top:12px}
.footer small{color:rgba(255,255,255,.78)}
.footer a,.footer-cols a{color:#fff}
.footer a:hover,.footer-cols a:hover{color:#fff;text-decoration:underline;text-underline-offset:5px}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px 28px}
.footer-cols strong{display:block;margin-bottom:8px;font-size:14px;font-weight:600;padding-bottom:12px;border-bottom:1px solid rgba(255,255,255,.22)}
.footer-cols a{display:block;padding:3px 0;font-size:14px}
@media(max-width:760px){.footer{grid-template-columns:1fr}.footer-cols{grid-template-columns:1fr 1fr;row-gap:36px}.footer .footer-logo{max-height:40px;height:auto}}