/* Site-wide composition; brand tokens and components come from KevaKit. */

.brand-lockup{display:inline-flex;align-items:center;gap:10px}
.brand-lockup img{display:block;width:30px;height:30px}
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:100;
  background:var(--kv-black);color:var(--kv-white);padding:10px 16px;
  font-family:var(--kv-mono);font-size:13px;text-decoration:none;
}
.skip-link:focus{left:0}

/* ---------- home ---------- */
.hero{padding:88px 0 84px}
.hero-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:56px;align-items:center}
.hero .kv-kicker{display:block;margin-bottom:16px}
.hero .kv-hero-title{max-width:18ch}
.hero .kv-body-lg{margin-top:24px;max-width:52ch}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:32px}

.topics{padding:84px 0}
.topics .kv-h2{max-width:26ch;margin-bottom:36px}
.topics .kv-card{border-bottom:1px solid var(--kv-line)}
.topics .kv-card:nth-last-child(-n+2){border-bottom:none}
.kv-card h3{font-family:var(--kv-display);font-weight:700;font-size:20px;letter-spacing:-.01em;color:var(--kv-black)}
.latest{padding:84px 0}
.latest .kv-h2{margin-bottom:36px}
.post-list{list-style:none;border-top:1px solid var(--kv-line)}
.post-list li{border-bottom:1px solid var(--kv-line)}
.post-list a{
  display:grid;grid-template-columns:110px 1fr auto;gap:24px;align-items:baseline;
  padding:20px 4px;text-decoration:none;transition:background .15s;
}
.post-list a:hover{background:var(--kv-off)}
.post-list a:hover .t{color:var(--kv-red)}
.post-list .d{font-family:var(--kv-mono);font-size:12.5px;color:var(--kv-gray-light)}
.post-list .t{font-family:var(--kv-display);font-weight:700;font-size:17px;letter-spacing:-.01em}
.post-list .tag{font-family:var(--kv-mono);font-size:12px;color:var(--kv-gray)}

.minimal-footer{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
.minimal-footer a:not(.kv-wordmark){font-size:14px;color:var(--kv-gray);text-decoration:none}
.minimal-footer a:not(.kv-wordmark):hover{color:var(--kv-red)}

.mobile-nav{display:none;position:relative}
.mobile-nav summary{
  list-style:none;border:1.5px solid var(--kv-black);cursor:pointer;
  font-family:var(--kv-mono);font-size:13px;padding:8px 14px;
}
.mobile-nav summary::-webkit-details-marker{display:none}
.mobile-nav[open] summary{background:var(--kv-black);color:var(--kv-white)}
.mobile-nav ul{
  position:absolute;right:0;top:calc(100% + 8px);min-width:180px;z-index:60;
  list-style:none;background:var(--kv-white);border:1px solid var(--kv-line);
  border-top:3px solid var(--kv-red);box-shadow:var(--kv-float);padding:8px;
}
.mobile-nav a{display:block;padding:10px 12px;text-decoration:none;font-size:14px}
.mobile-nav a:hover{background:var(--kv-off);color:var(--kv-red)}

/* ---------- topic pages ---------- */
.topic{padding:72px 0 96px}
.topic .kv-kicker{display:block;margin-bottom:14px}
.topic-title{margin-bottom:14px}
.topic-desc{max-width:56ch;margin-bottom:44px}
.topic-empty{display:block;margin-top:24px}

/* ---------- article pages ---------- */
.a-wrap{max-width:860px;margin:0 auto;padding:0 28px}
.article{padding:64px 0 96px}
.article-head .kv-kicker{display:block;margin-bottom:14px}
.article-head h1{
  font-family:var(--kv-display);font-weight:900;letter-spacing:-.02em;line-height:1.05;
  font-size:clamp(34px,5vw,52px);color:var(--kv-black);
}
.article-meta{font-family:var(--kv-mono);font-size:13px;color:var(--kv-gray);margin-top:16px}
.article-summary{font-size:18px;line-height:1.6;color:var(--kv-gray);margin-top:18px;max-width:58ch}

.toc{border:1.5px solid var(--kv-black);padding:20px 22px;margin:40px 0 8px}
.toc ol{margin:12px 0 0;padding-left:20px;font-family:var(--kv-mono);font-size:13.5px;line-height:2}
.toc a{color:var(--kv-black);text-decoration:none}
.toc a:hover{color:var(--kv-red)}

.mindmap{border:1.5px solid var(--kv-black);margin:18px 0 8px}
.mindmap summary{cursor:pointer;padding:16px 22px;list-style:none}
.mindmap summary::-webkit-details-marker{display:none}
.mindmap summary .kv-label::after{content:" ▸";color:var(--kv-red)}
.mindmap[open] summary .kv-label::after{content:" ▾"}
.mindmap concept-map{display:block;padding:4px 20px 18px;font-family:var(--kv-mono);font-size:12.5px;line-height:1.5;overflow-x:auto}
concept-map ul{list-style:none;margin:0;padding-left:20px}
concept-map ul.cm-root{padding-left:0}
concept-map li{position:relative;margin:6px 0;padding-left:16px}
concept-map li::before{content:"";position:absolute;left:0;top:0;height:100%;border-left:1px solid #c9c6c1}
concept-map li::after{content:"";position:absolute;left:0;top:12px;width:12px;border-top:1px solid #c9c6c1}
concept-map li:last-child::before{height:12px}
concept-map .cm-root>li{padding-left:0}
concept-map .cm-root>li::before,concept-map .cm-root>li::after{display:none}
concept-map .cm-node{display:inline-block;padding:2px 9px;background:var(--kv-white)}
concept-map .cm-root>li>.cm-node{border:1.5px solid var(--kv-red);color:var(--kv-red);font-weight:500}
concept-map .cm-root>li>ul>li>.cm-node{border:1px solid var(--kv-black);font-weight:500}
concept-map .cm-root>li>ul>li>ul .cm-node{padding:1px 4px;color:#444}
concept-map li.has>.cm-node{cursor:pointer}
concept-map li.has>.cm-node:hover{color:var(--kv-red)}
concept-map li.has>.cm-node::after{content:" ▾";font-size:9px;color:#999}
concept-map li.folded>.cm-node::after{content:" ▸";font-size:9px;color:var(--kv-red)}
concept-map li.folded>ul{display:none}

.prose{font-size:16.5px;line-height:1.68;color:var(--kv-black)}
.prose p{margin:18px 0}
.prose h2{
  font-family:var(--kv-display);font-weight:900;letter-spacing:-.02em;
  font-size:clamp(24px,3.2vw,32px);margin:64px 0 6px;
}
.prose h3{
  font-family:var(--kv-display);font-weight:700;letter-spacing:-.01em;
  font-size:20px;margin:40px 0 2px;
}
.prose a{color:var(--kv-black);text-decoration:underline;text-decoration-color:var(--kv-red);text-underline-offset:3px;overflow-wrap:anywhere}
.prose a:hover{color:var(--kv-red)}
.prose ul,.prose ol{margin:18px 0;padding-left:26px}
.prose li{margin:8px 0}
.prose strong{font-weight:700}
.prose code{font-family:var(--kv-mono);font-size:.88em;background:var(--kv-off);padding:2px 5px}
.prose pre{
  border:1.5px solid var(--kv-black);padding:18px 20px;margin:24px 0;
  overflow-x:auto;font-size:13.5px;line-height:1.6;
}
.prose pre code{background:none;padding:0;font-size:inherit}
.prose blockquote{border-left:3px solid var(--kv-red);margin:24px 0;padding:4px 0 4px 20px;color:var(--kv-gray)}
.prose table{border-collapse:collapse;width:100%;margin:24px 0;font-size:15px;line-height:1.55}
.prose th,.prose td{border:1px solid var(--kv-line,#ddd);padding:10px 14px;text-align:left;vertical-align:top}
.prose th{background:var(--kv-off);font-family:var(--kv-mono);font-size:12.5px;font-weight:500;letter-spacing:.02em}
.prose td:first-child{font-weight:500}
@media (max-width:640px){
  .prose table{display:block;overflow-x:auto}
}

.sim-embed{margin:8px 0}

.article-foot{margin-top:72px;border-top:1px solid var(--kv-line);padding-top:24px}
.back-link{font-family:var(--kv-mono);font-size:13px;color:var(--kv-gray);text-decoration:none;display:inline-block;margin-bottom:14px}
.back-link:hover{color:var(--kv-red)}
.article-foot .kv-meta a{color:inherit}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .kv-cards{grid-template-columns:1fr}
  .kv-card{border-right:none;border-bottom:1px solid var(--kv-line)}
  .kv-card:last-child{border-bottom:none}
}
@media (max-width:640px){
  .kv-nav-links{display:none}
  .mobile-nav{display:block}
  .hero{padding:64px 0}
  .post-list a{grid-template-columns:1fr;gap:4px}
  .minimal-footer{align-items:flex-start;flex-direction:column}
  .a-wrap{padding:0 20px}
}