:root{--bg:#f5f7fa;--surface:#fff;--surface-soft:#f8fafc;--text:#1f2937;--muted:#687386;--line:#dce2e9;--line-soft:#e9edf2;--blue:#2563eb;--blue-dark:#1d4ed8;--blue-soft:#eff6ff;--red:#dc2626;--shadow:0 8px 24px rgba(31,41,55,.06);--radius:10px;--max:1120px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;font-size:15px;line-height:1.55}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
button,input{font:inherit}
button{cursor:pointer}
.skip-link{position:absolute;top:-50px;left:12px;z-index:100;background:var(--text);color:#fff;padding:8px 12px;border-radius:6px}.skip-link:focus{top:10px}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:saturate(150%) blur(10px)}
.header-inner{max-width:var(--max);min-height:64px;margin:auto;padding:0 24px;display:flex;align-items:center;gap:32px}
.brand{display:inline-flex;align-items:center;gap:10px;color:#172033;font-size:18px;font-weight:750;letter-spacing:-.02em}.brand:hover{text-decoration:none}
.brand-mark{display:grid;place-items:center;width:32px;height:32px;border-radius:8px;background:var(--blue);color:#fff;font-size:15px;font-weight:800}
.site-nav{display:flex;align-items:center;gap:4px}.nav-link{padding:8px 11px;border-radius:7px;color:#4b5563;font-weight:600}.nav-link:hover,.nav-link[aria-current="page"]{background:#f1f5f9;color:#172033;text-decoration:none}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:10px}.button,.icon-button{display:inline-flex;align-items:center;justify-content:center;border-radius:7px;border:1px solid var(--line);background:#fff;color:#283548;font-weight:650;min-height:38px;padding:8px 14px}.button:hover,.icon-button:hover{text-decoration:none;background:#f8fafc}.button-primary{border-color:var(--blue);background:var(--blue);color:#fff}.button-primary:hover{background:var(--blue-dark)}
.menu-button{display:none;width:40px;padding:0}.menu-icon,.menu-icon::before,.menu-icon::after{display:block;width:18px;height:2px;background:currentColor;content:"";position:relative}.menu-icon::before{position:absolute;top:-6px}.menu-icon::after{position:absolute;top:6px}
.page-shell{max-width:var(--max);margin:0 auto;padding:32px 24px 54px;min-height:calc(100vh - 190px)}
.community-intro{display:flex;justify-content:space-between;gap:36px;align-items:flex-end;padding:12px 0 28px;border-bottom:1px solid var(--line)}
.eyebrow{color:var(--blue);font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.09em;margin:0 0 7px}.community-intro h1,.page-heading h1{font-size:31px;line-height:1.2;letter-spacing:-.035em;margin:0 0 8px;color:#172033}.community-intro p,.page-heading p{color:var(--muted);font-size:16px;margin:0;max-width:680px}
.community-stats{display:flex;gap:28px;flex-shrink:0}.stat{display:flex;flex-direction:column}.stat strong{font-size:18px;color:#172033}.stat span{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.045em}
.main-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;margin-top:26px}.section-heading{display:flex;align-items:center;justify-content:space-between;margin:0 0 12px}.section-heading h2{font-size:18px;margin:0;color:#172033}.section-heading a{font-size:13px;font-weight:650}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 1px 2px rgba(31,41,55,.025);overflow:hidden}.panel+.panel{margin-top:20px}
.discussion-row{display:grid;grid-template-columns:minmax(0,1fr) 76px 72px;gap:14px;align-items:center;padding:17px 18px;border-bottom:1px solid var(--line-soft);color:inherit}.discussion-row:last-child{border-bottom:0}.discussion-row:hover{background:#fafcff;text-decoration:none}.discussion-title{font-size:15px;font-weight:700;color:#243044;margin:0 0 4px}.discussion-title:hover{color:var(--blue)}.row-meta{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px}.category-dot{width:7px;height:7px;border-radius:50%;display:inline-block;background:var(--cat,#64748b)}.row-number{color:#4b5563;text-align:right;font-size:13px}.row-number span{display:block;color:#8a94a4;font-size:11px}.avatars{display:flex;margin-left:auto}.avatar{display:grid;place-items:center;flex:0 0 auto;width:34px;height:34px;border-radius:50%;background:var(--avatar,#64748b);color:#fff;font-size:12px;font-weight:800;border:2px solid #fff}.avatars .avatar{margin-left:-8px;width:28px;height:28px;font-size:10px}.avatars .avatar:first-child{margin-left:0}
.side-panel{padding:18px}.side-panel h3{font-size:15px;margin:0 0 10px}.side-panel p{margin:0;color:var(--muted);font-size:13px}.side-panel .button{width:100%;margin-top:15px}.online-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:13px}.online-user{display:flex;align-items:center;gap:6px;color:#485568;font-size:12px}.online-user .avatar{width:25px;height:25px;font-size:9px;border:0}
.category-list{display:grid;grid-template-columns:1fr 1fr;gap:14px}.category-card{display:grid;grid-template-columns:44px minmax(0,1fr) auto;gap:13px;align-items:start;padding:20px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);color:inherit}.category-card:hover{border-color:#bbc8d7;box-shadow:var(--shadow);text-decoration:none}.category-icon{display:grid;place-items:center;width:42px;height:42px;border-radius:9px;background:var(--cat-bg,#eef2ff);color:var(--cat,#4f46e5);font-size:18px;font-weight:800}.category-card h2{font-size:16px;margin:0 0 4px;color:#202c3e}.category-card p{margin:0;color:var(--muted);font-size:13px}.category-count{text-align:right;color:#536174;font-size:12px;white-space:nowrap}.category-count strong{display:block;color:#2a374b;font-size:13px}
.page-heading{margin:4px 0 24px}.content-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;max-width:780px}.content-card h2{font-size:20px;margin:28px 0 8px}.content-card h2:first-child{margin-top:0}.content-card p{color:#4b5563}.content-card ul{padding-left:22px}.content-card li{margin:8px 0}.notice{padding:14px 16px;border:1px solid #bfdbfe;background:var(--blue-soft);border-radius:8px;color:#1e3a5f}.notice[hidden]{display:none}.notice-head{display:flex;justify-content:space-between;gap:16px}.notice strong{display:block;margin-bottom:2px}.notice p{margin:0}.notice-close{border:0;background:transparent;color:inherit;font-size:20px;line-height:1;padding:2px}
.auth-layout{min-height:calc(100vh - 220px);display:grid;place-items:center}.auth-card{width:min(100%,430px);background:#fff;border:1px solid var(--line);border-radius:12px;padding:30px;box-shadow:var(--shadow)}.auth-card h1{font-size:24px;margin:0 0 7px}.auth-card>p{color:var(--muted);margin:0 0 22px}.form-group{margin:0 0 16px}.form-group label{display:block;font-weight:650;font-size:13px;margin-bottom:6px}.form-input{width:100%;min-height:43px;padding:9px 11px;border:1px solid #cbd3dc;border-radius:7px;background:#fff;color:var(--text)}.form-input:focus{outline:3px solid rgba(37,99,235,.16);border-color:var(--blue)}.form-row{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:4px 0 18px;font-size:13px}.check-label{display:flex;align-items:center;gap:7px}.auth-card .button-primary{width:100%}.auth-foot{text-align:center;margin:18px 0 0!important;font-size:13px}.login-message{margin:0 0 18px;padding:13px 14px;border:1px solid #fecaca;border-radius:8px;background:#fff7f7;color:#7f1d1d}.login-message h2{font-size:15px;margin:0 0 3px}.login-message p{font-size:13px;margin:0;color:#7f1d1d}
.topic-header{padding:22px 24px}.breadcrumbs{display:flex;gap:7px;align-items:center;font-size:12px;color:var(--muted);margin-bottom:12px}.topic-header h1{font-size:25px;line-height:1.25;letter-spacing:-.025em;margin:0 0 8px}.topic-meta{display:flex;flex-wrap:wrap;gap:12px;color:var(--muted);font-size:12px}.tag{display:inline-flex;align-items:center;gap:6px;background:#f1f5f9;color:#485568;padding:3px 8px;border-radius:99px;font-size:11px;font-weight:650}
.post{display:grid;grid-template-columns:150px minmax(0,1fr);border-top:1px solid var(--line)}.post-author{padding:23px 18px;background:#fafbfc;border-right:1px solid var(--line-soft)}.post-author .avatar{width:42px;height:42px;margin-bottom:9px;border:0}.username{font-weight:750;color:#283548}.role{display:block;color:var(--muted);font-size:11px;margin-top:2px}.post-body{padding:20px 24px 18px;min-width:0}.post-top{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;margin-bottom:14px}.post-content{color:#384457}.post-content p{margin:0 0 13px}.post-content p:last-child{margin-bottom:0}.post-actions{display:flex;justify-content:flex-end;gap:6px;margin-top:18px}.action-button{border:0;background:transparent;color:#667285;border-radius:6px;padding:6px 9px;font-size:12px;font-weight:650}.action-button:hover{background:#f1f5f9}.like-button.is-liked{color:var(--blue);background:var(--blue-soft)}.topic-footer{padding:18px 24px;border-top:1px solid var(--line);background:#fafbfc;display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:13px}
.site-footer{background:#fff;border-top:1px solid var(--line)}.footer-inner{max-width:var(--max);margin:auto;min-height:94px;padding:22px 24px;display:flex;align-items:center;gap:24px}.footer-brand{font-weight:700;color:#354257}.footer-links{display:flex;gap:18px}.footer-links a,.copyright{color:var(--muted);font-size:13px}.copyright{margin-left:auto}
.empty-state{text-align:center;padding:64px 24px}.empty-state .code{font-size:13px;font-weight:800;color:var(--blue);letter-spacing:.09em}.empty-state h1{font-size:28px;margin:8px 0}.empty-state p{color:var(--muted);margin:0 auto 20px;max-width:460px}
:focus-visible{outline:3px solid rgba(37,99,235,.35);outline-offset:2px}
@media(max-width:820px){.header-inner{padding:0 18px;flex-wrap:wrap;gap:12px}.menu-button{display:inline-flex}.header-actions{margin-left:auto}.site-nav{display:none;order:3;width:100%;padding:0 0 12px;flex-direction:column;align-items:stretch}.site-nav.is-open{display:flex}.nav-link{width:100%}.page-shell{padding:24px 18px 44px}.community-intro{align-items:flex-start;flex-direction:column}.main-grid{grid-template-columns:1fr}.side-column{display:grid;grid-template-columns:1fr 1fr;gap:14px}.panel+.panel{margin-top:0}.category-list{grid-template-columns:1fr}.footer-inner{flex-wrap:wrap}.copyright{width:100%;margin-left:0}.post{grid-template-columns:115px 1fr}.post-author{padding:18px 13px}.post-body{padding:18px}}
@media(max-width:560px){body{font-size:14px}.header-inner{min-height:58px}.brand{font-size:16px}.brand-mark{width:29px;height:29px}.header-actions .button{padding:7px 10px;min-height:36px}.community-intro h1,.page-heading h1{font-size:26px}.community-stats{width:100%;gap:0;justify-content:space-between}.stat strong{font-size:16px}.discussion-row{grid-template-columns:minmax(0,1fr) 50px;padding:14px}.discussion-row>.row-number:last-child{display:none}.side-column{grid-template-columns:1fr}.category-card{grid-template-columns:40px minmax(0,1fr);padding:16px}.category-count{grid-column:2;text-align:left;display:flex;gap:14px}.category-count strong{display:inline}.content-card{padding:20px}.auth-card{padding:23px}.form-row{align-items:flex-start;flex-direction:column}.post{display:block}.post-author{display:flex;align-items:center;gap:9px;border-right:0;border-bottom:1px solid var(--line-soft);padding:13px 15px}.post-author .avatar{width:34px;height:34px;margin:0}.role{display:inline;margin-left:4px}.post-body{padding:16px}.topic-header{padding:19px 16px}.topic-header h1{font-size:21px}.topic-footer{padding:15px 16px}.footer-inner{align-items:flex-start;flex-direction:column;gap:12px}.footer-links{flex-wrap:wrap}}