/* ---------- 英雄区 + 战术沙盘视觉 ---------- */
.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}
.cta-row .btn{font-size:14px;padding:13px 24px}
.page-head .wrap{position:relative;padding:32px 24px 40px;min-height:360px}
.crumb{position:relative;z-index:2}
.head-text{position:relative;z-index:2;display:flex;flex-direction:column;gap:14px;max-width:560px;padding:8px 0 0}
.head-text .intel-stats,.head-text .cta-row{align-self:flex-start}
.head-visual{position:absolute;top:50%;right:0;transform:translateY(-50%);width:50%;aspect-ratio:1.618/1;height:auto;background:radial-gradient(circle at 70% 55%,rgba(166,201,74,.16),transparent 62%),radial-gradient(circle at 18% 28%,rgba(213,56,44,.14),transparent 58%);overflow:hidden;-webkit-mask:radial-gradient(125% 145% at 50% 50%,#000 50%,transparent 100%);mask:radial-gradient(125% 145% at 50% 50%,#000 50%,transparent 100%)}
.head-visual svg{position:absolute;inset:0;width:100%;height:100%;display:block}
.head-visual .corner{position:absolute;width:18px;height:18px;border:1.5px solid var(--gold)}
.head-visual .corner.tl{top:10px;left:10px;border-right:none;border-bottom:none}
.head-visual .corner.tr{top:10px;right:10px;border-left:none;border-bottom:none}
.head-visual .corner.bl{bottom:10px;left:10px;border-right:none;border-top:none}
.head-visual .corner.br{bottom:10px;right:10px;border-left:none;border-top:none}
.head-visual .v-tag{position:absolute;top:14px;right:18px;font-family:var(--mono);font-size:10.5px;color:var(--green);letter-spacing:.22em;border:1px solid rgba(166,201,74,.5);padding:3px 8px;background:rgba(166,201,74,.08)}
.head-visual .v-meta{position:absolute;left:18px;bottom:14px;font-family:var(--mono);font-size:10.5px;color:var(--muted);letter-spacing:.16em;display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.head-visual .v-meta b{color:var(--gold);font-weight:600}
@keyframes signal-pulse{0%{transform:scale(.4);opacity:.9}100%{transform:scale(1.6);opacity:0}}
.head-visual .pulse{transform-origin:0 0;animation:signal-pulse 3.2s ease-out infinite}
.head-visual .pulse.d2{animation-delay:1.06s}
.head-visual .pulse.d3{animation-delay:2.13s}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.25}}
.head-visual .led{animation:blink 1.4s step-end infinite}
@media(max-width:860px){
  .page-head .wrap{display:flex;flex-direction:column;gap:18px;padding:24px 24px 28px;min-height:auto}
  .head-visual{position:relative;inset:auto;top:auto;right:auto;transform:none;width:100%;height:200px;order:-1}
  .head-text{padding-top:0}
}

/* ---------- 板块导航 ---------- */
.boards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.board{position:relative;border:1px solid var(--line);background:var(--panel);padding:20px 20px 18px;display:flex;flex-direction:column;gap:10px;overflow:hidden;transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease}
.board:hover{border-color:var(--accent,var(--gold));transform:translateY(-3px);box-shadow:0 6px 20px rgba(217,164,65,.14)}
.board::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent,var(--gold))}
.board .bcode{font-family:var(--mono);font-size:10px;letter-spacing:.22em;color:var(--muted)}
.board h3{font-family:var(--disp);font-weight:400;font-size:21px;letter-spacing:.06em;color:var(--ink)}
.board .bsub{font-size:12.5px;color:var(--muted);flex:1;line-height:1.6}
.board .bnums{display:flex;gap:16px;font-family:var(--mono);font-size:11.5px;color:var(--muted)}
.board .bnums b{color:var(--accent,var(--gold));font-weight:600;display:block;font-size:14px}
.board.c-red{--accent:var(--red)} .board.c-gold{--accent:var(--gold)}
.board.c-green{--accent:var(--green)} .board.c-blue{--accent:var(--blue)}
.board.c-purple{--accent:var(--purple)} .board.c-muted{--accent:var(--muted)}
@media(max-width:900px){.boards{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.boards{grid-template-columns:1fr}}

/* ---------- 主区 + 侧栏 ---------- */
.forum{display:grid;grid-template-columns:1.7fr 1fr;gap:32px;align-items:start}
@media(max-width:980px){.forum{grid-template-columns:1fr}}

.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.filters button{font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--muted);background:transparent;border:1px solid var(--line);padding:7px 14px;cursor:pointer;transition:all .15s}
.filters button:hover{color:var(--ink);border-color:var(--muted)}
.filters button.on{color:#fff;background:var(--red);border-color:var(--red)}

.post{display:flex;gap:16px;border:1px solid var(--line);background:var(--panel);padding:16px 18px;margin-bottom:12px;transition:border-color .2s ease,box-shadow .2s ease}
.post:hover{border-color:var(--red);box-shadow:0 4px 16px rgba(213,56,44,.12)}
.post .pavatar{flex-shrink:0;width:42px;height:42px;border:1px solid var(--line);display:grid;place-items:center;font-family:var(--disp);font-size:18px;color:var(--ink);background:var(--bg-2)}
.post .pbody{flex:1;min-width:0}
.post .ptags{display:flex;gap:8px;align-items:center;margin-bottom:12px;flex-wrap:wrap}
.post .ptag{font-family:var(--mono);font-size:10px;letter-spacing:.12em;padding:2px 8px;border:1px solid var(--accent,var(--line));color:var(--accent,var(--muted));background:rgba(14,16,10,.55)}
.post .ptag.k-red{--accent:var(--red)} .post .ptag.k-gold{--accent:var(--gold)}
.post .ptag.k-green{--accent:var(--green)} .post .ptag.k-blue{--accent:var(--blue)}
.post .ptag.k-purple{--accent:var(--purple)} .post .ptag.k-hazard{--accent:var(--hazard)}
.post h3{font-size:16px;font-weight:700;letter-spacing:.02em;color:var(--ink);line-height:1.4}
.post h3:hover{color:var(--red)}
.post .pdesc{font-size:13px;color:var(--muted);margin-top:5px;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;overflow:hidden;-webkit-box-orient:vertical}
.post .pmeta{display:flex;gap:14px;font-family:var(--mono);font-size:11px;color:var(--muted);margin-top:9px;flex-wrap:wrap}
.post .pmeta b{color:var(--ink);font-weight:600}
.post .pmeta .hot{color:var(--red)}
.post .pstat{flex-shrink:0;text-align:center;font-family:var(--mono);min-width:54px;align-self:center}
.post .pstat .n{font-size:18px;font-weight:600;color:var(--ink)}
.post .pstat .l{font-size:10px;color:var(--muted);letter-spacing:.08em}

/* ---------- 侧栏 ---------- */
.side-card{border:1px solid var(--line);background:var(--panel);padding:20px;margin-bottom:20px}
.side-card h4{font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--green);margin-bottom:16px;display:flex;justify-content:space-between}
.side-card h4 span{color:var(--muted)}
.rank-item{display:flex;align-items:center;gap:12px;padding:9px 0;border-bottom:1px dashed var(--line-soft);font-size:13px}
.rank-item:last-child{border-bottom:none}
.rank-item .idx{font-family:var(--mono);font-size:13px;color:var(--muted);width:22px}
/* 难度图例的星标：宽度自适应（★★★★ 约 48px 会超出 22px 序号宽度遮住文字）；
   flex-shrink:0 保证窄视口/大字体下星级不被压缩溢出，rt 加 min-width:0 让文字收缩换行 */
.diff-legend .rank-item{gap:14px}
.diff-legend .rank-item .idx{width:auto;min-width:22px;text-align:left;letter-spacing:.04em;flex-shrink:0;white-space:nowrap}
.rank-item .idx.top{color:var(--red);font-weight:700}
.rank-item .rt{flex:1;color:var(--ink);min-width:0}
.rank-item .rt a{color:var(--ink)}
.rank-item .rt a:hover{color:var(--red)}
.rank-item .heat{font-family:var(--mono);font-size:11px;color:var(--gold)}
.heatbar{height:4px;background:var(--bg-2);margin-top:5px;overflow:hidden}
.heatbar i{display:block;height:100%;background:linear-gradient(90deg,var(--red),var(--gold))}

/* ---------- 投稿 CTA ---------- */
.enlist{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;border:1px solid var(--line);background:linear-gradient(120deg,rgba(213,56,44,.12),var(--panel) 55%);padding:28px 30px;margin-top:8px}
.enlist h3{font-family:var(--disp);font-weight:400;font-size:23px;letter-spacing:.06em}
.enlist p{font-size:13.5px;color:var(--muted);margin-top:6px;max-width:620px}
.enlist p b{color:var(--ink);font-weight:500}
@media(max-width:640px){.enlist{padding:22px}.enlist .btn{width:100%;justify-content:center}}

/* ---------- 补丁 1：键盘无障碍 Focus 态 ---------- */
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--gold)!important;outline-offset:3px!important}

/* ---------- 补丁 2：卡片与按钮 Hover 视觉增强 ---------- */
.board{transition:transform .25s cubic-bezier(.16,1,.3,1),border-color .25s ease,box-shadow .25s ease}
.board:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.4),0 0 12px rgba(217,164,65,.15)}
.post{transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease,opacity .25s ease}
.post:hover{transform:translateX(4px);border-color:var(--red);box-shadow:-4px 0 0 0 var(--red),0 6px 20px rgba(0,0,0,.3)}

/* ---------- 补丁 3：筛选淡入淡出 ---------- */
.post.is-hidden{display:none!important}
.post.fade-enter{animation:postFadeIn .3s cubic-bezier(.16,1,.3,1) forwards}
@keyframes postFadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}

/* ---------- 补丁 4：SVG 战术沙盘光影脉冲 ---------- */
@keyframes grid-glow{0%,100%{opacity:.4}50%{opacity:.85}}
.head-visual svg path[stroke*="213,56,44"]{animation:grid-glow 3s ease-in-out infinite}

/* ---------- 补丁 5：移动端数据盒平铺 ---------- */
@media(max-width:640px){
  .intel-stats{display:grid!important;grid-template-columns:repeat(2,1fr)!important;width:100%!important}
  .intel-stats>div{border-bottom:1px solid var(--line)}
  .intel-stats>div:nth-child(2n){border-right:none}
}