@import url("/knowledge/assets/site.css");

:root{
  --ink:#111111;
  --text:#3a3a3c;
  --muted:#737373;
  --line:#e7e7e7;
  --soft:#f7f7f7;
  --page:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:#fff;
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Inter,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
.page{
  width:min(var(--page),calc(100% - 64px));
  margin:0 auto;
  padding:88px 0 112px;
}
.hero{max-width:760px}
h1{
  margin:0;
  font-size:clamp(44px,5vw,64px);
  line-height:1;
  letter-spacing:-.045em;
  font-weight:700;
}
.hero p{
  max-width:680px;
  margin:20px 0 0;
  color:var(--text);
  font-size:19px;
  line-height:1.55;
  letter-spacing:-.012em;
}
.search{
  position:relative;
  max-width:720px;
  margin-top:40px;
}
.search svg{
  position:absolute;
  left:18px;
  top:50%;
  width:19px;
  height:19px;
  transform:translateY(-50%);
  fill:none;
  stroke:#6f6f73;
  stroke-width:1.7;
  stroke-linecap:round;
  pointer-events:none;
}
.search input{
  width:100%;
  height:58px;
  padding:0 18px 0 50px;
  border:1px solid #cfcfcf;
  border-radius:12px;
  outline:none;
  background:#fff;
  color:var(--ink);
  font-size:16px;
  transition:border-color .14s ease,box-shadow .14s ease;
}
.search input::placeholder{color:#8a8a8e}
.search input:focus{
  border-color:#111;
  box-shadow:0 0 0 3px rgba(0,0,0,.055);
}
.library{
  margin-top:96px;
}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:32px;
  padding-bottom:18px;
  border-bottom:1px solid var(--line);
}
h2{
  margin:0;
  font-size:28px;
  line-height:1.15;
  letter-spacing:-.032em;
  font-weight:680;
}
.section-head p{
  margin:0;
  color:var(--muted);
  font-size:14px;
  line-height:1.4;
}
.category-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  column-gap:56px;
}
.category{
  min-width:0;
  display:block;
  padding:24px 0 26px;
  border-bottom:1px solid var(--line);
  transition:background-color .12s ease;
}
.category:hover{background:#fafafa}
.category:focus-visible{
  outline:2px solid #111;
  outline-offset:4px;
  border-radius:4px;
}
.category strong{
  display:block;
  font-size:18px;
  line-height:1.3;
  letter-spacing:-.018em;
  font-weight:640;
}
.category span{
  display:block;
  max-width:430px;
  margin-top:7px;
  color:var(--muted);
  font-size:14px;
  line-height:1.5;
}
.category[hidden]{display:none}
.empty{
  display:none;
  padding:28px 0;
  color:var(--muted);
  font-size:15px;
}
.empty.show{display:block}
.footer-note{
  margin-top:72px;
  padding-top:24px;
  border-top:1px solid var(--line);
  color:var(--muted);
  font-size:13px;
  line-height:1.5;
}
@media (max-width:760px){
  .page{
    width:min(100% - 40px,var(--page));
    padding:56px 0 80px;
  }
  h1{font-size:42px;letter-spacing:-.04em}
  .hero p{margin-top:16px;font-size:17px;line-height:1.5}
  .search{margin-top:30px}
  .search input{height:54px;border-radius:10px}
  .library{margin-top:68px}
  .section-head{display:block;padding-bottom:14px}
  h2{font-size:24px}
  .section-head p{margin-top:7px}
  .category-grid{grid-template-columns:1fr;column-gap:0}
  .category{padding:20px 0 21px}
  .category strong{font-size:17px}
  .category span{margin-top:6px;font-size:13.5px}
  .footer-note{margin-top:56px}
}
@media (max-width:360px){
  .page{width:calc(100% - 32px);padding-top:44px}
  h1{font-size:38px}
  .hero p{font-size:16px}
  .library{margin-top:60px}
}
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important;transition:none!important}
}

/* Hierarchy additions within the locked crystal-minimal language. */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  gap:7px;
  align-items:center;
  margin:0 0 48px;
  color:var(--muted);
  font-size:12px;
  line-height:1.4;
}
.breadcrumb a:hover{color:var(--ink)}
.topic-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  column-gap:56px;
}
.topic,.article-row{
  min-width:0;
  display:block;
  padding:24px 0 26px;
  border-bottom:1px solid var(--line);
  transition:background-color .12s ease;
}
.topic:hover,.article-row:hover{background:#fafafa}
.topic:focus-visible,.article-row:focus-visible{
  outline:2px solid #111;
  outline-offset:4px;
  border-radius:4px;
}
.topic strong,.article-row strong{
  display:block;
  font-size:18px;
  line-height:1.3;
  letter-spacing:-.018em;
  font-weight:640;
}
.topic span,.article-row span{
  display:block;
  max-width:680px;
  margin-top:7px;
  color:var(--muted);
  font-size:14px;
  line-height:1.5;
}
.article-list{display:flex;flex-direction:column}
.article-row.is-planned{pointer-events:none;cursor:default}
.article-row.is-planned strong{color:#444}
.article-row.is-planned span{color:#909090}
@media (max-width:760px){
  .breadcrumb{margin-bottom:36px}
  .topic-grid{grid-template-columns:1fr;column-gap:0}
  .topic,.article-row{padding:20px 0 21px}
  .topic strong,.article-row strong{font-size:17px}
  .topic span,.article-row span{margin-top:6px;font-size:13.5px}
}