/* 黄色仓库 - 全局样式表
   设计语言：档案黄 + 深棕，知识库式布局
   规范：BEM 命名 + CSS 变量 + Flex/Grid 响应式
*/
:root{
  --primary:#F9A825;
  --secondary:#F57F17;
  --bg:#FFFDE7;
  --card-bg:#FFFFFF;
  --accent:#FBC02D;
  --text:#3E2723;
  --text-light:#6D4C41;
  --border:#E8D9A5;
  --shadow-sm:0 1px 3px rgba(62,39,35,.08);
  --shadow-md:0 4px 12px rgba(62,39,35,.12);
  --shadow-lg:0 10px 30px rgba(62,39,35,.15);
  --radius:8px;
  --radius-lg:14px;
  --font-serif:"Noto Serif SC","Source Han Serif SC",Georgia,serif;
  --font-sans:Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei",Arial,sans-serif;
  --font-mono:"Fira Code",Consolas,Monaco,monospace;
  --gap:1rem;
  --nav-w:280px;
  --header-h:64px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  font-size:15px;
  min-height:100vh;
}
h1,h2,h3,h4,h5{font-family:var(--font-serif);color:var(--text);line-height:1.3;margin-bottom:.6em}
h1{font-size:2.2rem}h2{font-size:1.7rem}h3{font-size:1.3rem}
a{color:var(--secondary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary)}
img{max-width:100%;height:auto;display:block}
code,pre{font-family:var(--font-mono);background:#FFF8E1;padding:2px 6px;border-radius:4px;font-size:.92em}
pre{padding:1rem;overflow-x:auto;border-left:4px solid var(--primary)}
ul,ol{padding-left:1.5em}
blockquote{border-left:4px solid var(--accent);background:#FFF8E1;padding:.8rem 1.2rem;margin:1rem 0;color:var(--text-light)}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:var(--card-bg);
  border-bottom:1px solid var(--border);
  box-shadow:var(--shadow-sm);
  height:var(--header-h);
  display:flex;align-items:center;
  padding:0 1.5rem;
  gap:1.5rem;
}
.site-header__logo{display:flex;align-items:center;gap:.6rem;font-family:var(--font-serif);font-weight:700;font-size:1.2rem;color:var(--text)}
.site-header__logo img{width:36px;height:36px}
.site-header__nav{display:flex;gap:1.4rem;flex:1}
.site-header__nav a{color:var(--text);font-weight:500;font-size:.95rem}
.site-header__nav a:hover,.site-header__nav a.is-active{color:var(--primary)}
.site-header__search{
  flex:0 1 360px;display:flex;background:var(--bg);
  border:1px solid var(--border);border-radius:24px;
  padding:.4rem .9rem;align-items:center;gap:.5rem;
}
.site-header__search input{flex:1;border:0;background:transparent;outline:none;font-size:.92rem;color:var(--text)}
.site-header__cta{background:var(--primary);color:#fff;padding:.5rem 1rem;border-radius:6px;font-weight:600;font-size:.9rem}
.site-header__cta:hover{background:var(--secondary);color:#fff}
.menu-toggle{display:none;background:none;border:0;font-size:1.6rem;color:var(--text);cursor:pointer}

/* ===== Layout: knowledge base shell ===== */
.kb-shell{display:grid;grid-template-columns:var(--nav-w) 1fr;min-height:calc(100vh - var(--header-h))}
.kb-tree{
  background:var(--card-bg);
  border-right:1px solid var(--border);
  padding:1.2rem 1rem;overflow-y:auto;
  position:sticky;top:var(--header-h);
  height:calc(100vh - var(--header-h));
}
.kb-tree__title{font-family:var(--font-serif);font-size:.95rem;color:var(--text-light);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.8rem}
.tree{list-style:none;padding:0}
.tree li{margin:.15rem 0}
.tree__node{display:flex;align-items:center;gap:.35rem;padding:.4rem .55rem;border-radius:6px;cursor:pointer;font-size:.92rem;color:var(--text);transition:background .15s}
.tree__node:hover{background:var(--bg)}
.tree__node.is-open>.tree__arrow{transform:rotate(90deg)}
.tree__arrow{display:inline-block;transition:transform .2s;font-size:.7rem;color:var(--text-light);width:10px}
.tree__icon{color:var(--primary)}
.tree__children{list-style:none;padding-left:1.2rem;max-height:0;overflow:hidden;transition:max-height .3s ease}
.tree li.is-open>.tree__children{max-height:1000px}
.tree__badge{margin-left:auto;background:var(--accent);color:var(--text);font-size:.7rem;padding:1px 6px;border-radius:8px}

.kb-content{padding:2rem 2.5rem;max-width:1100px;width:100%}
@media (max-width:960px){
  .kb-shell{grid-template-columns:1fr}
  .kb-tree{display:none;position:fixed;z-index:60;width:80%;max-width:320px}
  .kb-tree.is-open{display:block}
  .kb-content{padding:1.2rem}
  .menu-toggle{display:block}
  .site-header__nav{display:none}
  .site-header__search{flex-basis:auto}
}

/* ===== Hero ===== */
.hero{
  position:relative;
  background:linear-gradient(135deg,#F9A825 0%,#F57F17 100%);
  color:#fff;
  padding:5rem 1.5rem 4rem;
  text-align:center;
  overflow:hidden;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background-image:url('../images/hero-knowledge-vault.webp');
  background-size:cover;background-position:center;
  opacity:.18;z-index:0;
}
.hero__inner{position:relative;z-index:1;max-width:880px;margin:0 auto}
.hero h1{color:#fff;font-size:2.8rem;margin-bottom:.6rem;text-shadow:0 2px 8px rgba(0,0,0,.2)}
.hero p{font-size:1.15rem;margin-bottom:2rem;opacity:.95}
.hero__search{display:flex;background:#fff;border-radius:50px;padding:.4rem;box-shadow:var(--shadow-lg);max-width:640px;margin:0 auto}
.hero__search input{flex:1;border:0;outline:none;padding:.9rem 1.2rem;font-size:1rem;color:var(--text);background:transparent}
.hero__search button{background:var(--primary);color:#fff;border:0;padding:0 1.8rem;border-radius:50px;font-weight:600;cursor:pointer;font-size:1rem}
.hero__search button:hover{background:var(--secondary)}
.hero__hot{margin-top:1.2rem;font-size:.9rem;opacity:.9}
.hero__hot a{color:#fff;margin:0 .5rem;border-bottom:1px dotted rgba(255,255,255,.5)}

/* ===== Sections ===== */
.section{padding:3rem 1.5rem;max-width:1280px;margin:0 auto}
.section__head{text-align:center;margin-bottom:2rem}
.section__head h2{position:relative;display:inline-block;padding-bottom:.4rem}
.section__head h2::after{content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);width:60px;height:3px;background:var(--primary);border-radius:2px}
.section__subtitle{color:var(--text-light);margin-top:.4rem}

/* ===== Feature grid ===== */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.2rem}
.feature-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem;text-align:center;transition:transform .25s,box-shadow .25s}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.feature-card__icon{width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.6rem;margin:0 auto 1rem}
.feature-card h3{font-size:1.1rem;margin-bottom:.4rem}
.feature-card p{font-size:.92rem;color:var(--text-light)}

/* ===== Cards grid (knowledge bases) ===== */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.4rem}
.card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:transform .25s,box-shadow .25s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.card__img{aspect-ratio:16/10;object-fit:cover;background:#FFF8E1}
.card__body{padding:1.1rem 1.2rem;flex:1;display:flex;flex-direction:column}
.card__title{font-family:var(--font-serif);font-size:1.05rem;margin-bottom:.4rem;color:var(--text)}
.card__desc{font-size:.88rem;color:var(--text-light);margin-bottom:.8rem;flex:1}
.card__meta{display:flex;gap:1rem;font-size:.8rem;color:var(--text-light);border-top:1px dashed var(--border);padding-top:.6rem}
.card__meta span{display:flex;align-items:center;gap:.25rem}

/* ===== Timeline (latest archives) ===== */
.timeline{position:relative;padding-left:2rem;max-width:780px;margin:0 auto}
.timeline::before{content:"";position:absolute;left:8px;top:0;bottom:0;width:2px;background:var(--border)}
.timeline__item{position:relative;padding:.4rem 0 1.2rem;}
.timeline__item::before{content:"";position:absolute;left:-1.7rem;top:.9rem;width:14px;height:14px;border-radius:50%;background:var(--primary);border:3px solid var(--bg)}
.timeline__date{font-size:.8rem;color:var(--text-light);display:block;margin-bottom:.2rem}
.timeline__title{font-family:var(--font-serif);font-size:1.05rem;margin-bottom:.25rem}
.timeline__title a{color:var(--text)}.timeline__title a:hover{color:var(--primary)}
.timeline__desc{font-size:.9rem;color:var(--text-light)}

/* ===== Tag cloud ===== */
.tagcloud{display:flex;flex-wrap:wrap;gap:.6rem;justify-content:center}
.tagcloud a{
  background:var(--card-bg);border:1px solid var(--border);
  padding:.35rem .9rem;border-radius:20px;font-size:.88rem;color:var(--text);
}
.tagcloud a:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.tagcloud a.is-hot{background:var(--accent);border-color:var(--accent)}

/* ===== Stats ===== */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1rem;text-align:center}
.stat{background:var(--card-bg);border-radius:var(--radius-lg);padding:1.5rem 1rem;border:1px solid var(--border)}
.stat__num{font-family:var(--font-serif);font-size:2.2rem;color:var(--primary);font-weight:700}
.stat__label{color:var(--text-light);font-size:.9rem;margin-top:.3rem}

/* ===== Article (doc detail) ===== */
.article{background:var(--card-bg);border-radius:var(--radius-lg);padding:2.2rem 2.5rem;box-shadow:var(--shadow-sm);border:1px solid var(--border)}
.article__meta{color:var(--text-light);font-size:.88rem;margin-bottom:1.4rem;border-bottom:1px dashed var(--border);padding-bottom:1rem}
.article__meta span{margin-right:1.2rem}
.article h2,.article h3{margin-top:1.8rem}
.article p{margin-bottom:1rem;color:var(--text)}
.article table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.92rem}
.article th,.article td{border:1px solid var(--border);padding:.5rem .8rem;text-align:left}
.article th{background:#FFF8E1;font-weight:600}
.article .tags{display:flex;gap:.4rem;flex-wrap:wrap;margin:1.2rem 0}
.article .tags span{background:#FFF8E1;border:1px solid var(--border);padding:.2rem .7rem;border-radius:12px;font-size:.8rem;color:var(--text-light)}

/* ===== Outline (right sidebar in doc) ===== */
.outline{position:sticky;top:calc(var(--header-h) + 1rem);background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1rem;font-size:.88rem;max-height:calc(100vh - 100px);overflow:auto}
.outline h4{font-size:.85rem;color:var(--text-light);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.6rem}
.outline ul{list-style:none;padding:0}
.outline li{padding:.25rem 0;border-left:2px solid transparent;padding-left:.6rem}
.outline li:hover{border-color:var(--primary)}
.outline li a{color:var(--text)}

/* ===== Search ===== */
.search-page{display:grid;grid-template-columns:240px 1fr;gap:2rem;max-width:1280px;margin:2rem auto;padding:0 1.5rem}
@media (max-width:768px){.search-page{grid-template-columns:1fr}}
.filters{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.2rem;height:fit-content}
.filters h4{font-size:.95rem;margin-top:1rem}
.filters h4:first-child{margin-top:0}
.filters label{display:flex;align-items:center;gap:.4rem;font-size:.9rem;color:var(--text-light);padding:.2rem 0;cursor:pointer}
.search-result{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.2rem 1.4rem;margin-bottom:1rem;transition:box-shadow .2s}
.search-result:hover{box-shadow:var(--shadow-md)}
.search-result h3{margin-bottom:.3rem;font-size:1.1rem}
.search-result__snippet{color:var(--text-light);font-size:.92rem;margin-bottom:.4rem}
.search-result mark{background:var(--accent);color:var(--text);padding:0 3px;border-radius:3px}
.search-result__meta{font-size:.8rem;color:var(--text-light)}

/* ===== Buttons ===== */
.btn{display:inline-block;padding:.6rem 1.4rem;border-radius:6px;border:0;cursor:pointer;font-weight:600;font-size:.95rem;transition:all .2s}
.btn--primary{background:var(--primary);color:#fff}
.btn--primary:hover{background:var(--secondary);color:#fff}
.btn--ghost{background:transparent;border:1px solid var(--primary);color:var(--primary)}
.btn--ghost:hover{background:var(--primary);color:#fff}

/* ===== Breadcrumb ===== */
.breadcrumb{font-size:.85rem;color:var(--text-light);margin-bottom:1rem}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}

/* ===== Footer ===== */
.site-footer{background:#3E2723;color:#FFF8E1;padding:3rem 1.5rem 1.5rem;margin-top:4rem}
.site-footer__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:2rem;max-width:1280px;margin:0 auto}
.site-footer h4{color:#FBC02D;font-size:1rem;margin-bottom:.8rem;font-family:var(--font-serif)}
.site-footer ul{list-style:none;padding:0}
.site-footer li{padding:.25rem 0}
.site-footer a{color:#FFF8E1;font-size:.9rem;opacity:.85}
.site-footer a:hover{opacity:1;color:var(--accent)}
.site-footer__bottom{max-width:1280px;margin:2rem auto 0;padding-top:1.2rem;border-top:1px solid rgba(255,248,225,.15);text-align:center;font-size:.85rem;opacity:.7}

/* ===== Skeleton ===== */
.skeleton{background:linear-gradient(90deg,#f5e6c8 25%,#fff8e1 50%,#f5e6c8 75%);background-size:200% 100%;animation:sk 1.4s infinite;border-radius:6px;height:1em;margin:.3em 0}
@keyframes sk{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ===== Utilities ===== */
.muted{color:var(--text-light)}
.center{text-align:center}
.mt-2{margin-top:2rem}.mt-3{margin-top:3rem}
.grid-2{display:grid;grid-template-columns:1fr 320px;gap:2rem}
@media (max-width:960px){.grid-2{grid-template-columns:1fr}}

/* ===== 404 ===== */
.notfound{min-height:60vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;text-align:center}
.notfound h1{font-size:6rem;color:var(--primary);margin-bottom:0}

/* lazy fade-in */
img[loading="lazy"]{opacity:0;transition:opacity .4s}
img[loading="lazy"].is-loaded{opacity:1}