:root{
  --ink:#13312f;
  --ink-soft:#3d5b58;
  --teal:#0f4c48;
  --teal-deep:#0a3532;
  --teal-pale:#e6efed;
  --amber:#c8862a;
  --amber-pale:#faf1e2;
  --paper:#fbfaf7;
  --line:#d5dedb;
  --line-soft:#e8eeec;
  --radius:10px;
  --wrap:1160px;
  --font-serif:"Noto Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16.5px;
  line-height:1.85;
  color:var(--ink);
  background:var(--paper);
}
img{max-width:100%;height:auto;display:block}
a{color:var(--teal);text-decoration:none}
a:hover{color:var(--amber)}
h1,h2,h3,h4{font-family:var(--font-serif);line-height:1.4;color:var(--teal-deep);margin:0 0 .6em}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 22px}

/* ---------- header ---------- */
.site-header{
  background:var(--teal-deep);
  color:#eaf3f1;
  border-bottom:3px solid var(--amber);
}
.site-header .wrap{
  display:flex;align-items:center;justify-content:space-between;
  gap:18px;min-height:74px;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:12px}
.brand img{width:42px;height:42px;border-radius:8px;flex:0 0 auto}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{font-family:var(--font-serif);font-size:1.16rem;font-weight:700;color:#fff;letter-spacing:.02em}
.brand-tag{font-size:.74rem;color:#9dbfba;letter-spacing:.12em;text-transform:uppercase}
.nav-toggle{
  display:none;background:transparent;border:1px solid #3f6b67;color:#d8e7e4;
  border-radius:8px;padding:7px 12px;font-size:.9rem;cursor:pointer;font-family:var(--font-sans);
}
.site-nav ul{display:flex;flex-wrap:wrap;gap:4px;list-style:none;margin:0;padding:0}
.site-nav a{
  display:block;padding:8px 12px;border-radius:7px;
  color:#cfe3df;font-size:.94rem;letter-spacing:.01em;
}
.site-nav a:hover{background:#154f4a;color:#fff}
.site-nav a.is-current{background:#fff;color:var(--teal-deep);font-weight:600}

/* ---------- hero / home ---------- */
.hero{
  background:linear-gradient(160deg,#0a3532 0%,#134f4a 62%,#1c635b 100%);
  color:#eef6f4;padding:54px 0 46px;position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;right:-90px;top:-70px;width:340px;height:340px;
  border-radius:50%;background:radial-gradient(circle,rgba(200,134,42,.32),transparent 68%);
}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:40px;align-items:center;position:relative;z-index:1}
.hero h1{color:#fff;font-size:2.3rem;margin-bottom:.45em;letter-spacing:.01em}
.hero p{color:#c4dbd7;font-size:1.03rem;margin:0 0 1.3em;max-width:34em}
.hero-figure{margin:0}
.hero-figure img{border-radius:var(--radius);box-shadow:0 18px 40px rgba(4,28,26,.45)}
.eyebrow{
  display:inline-block;font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--amber);margin-bottom:.9em;font-weight:600;
}
.btn{
  display:inline-block;background:var(--amber);color:#25190a;font-weight:600;
  padding:11px 22px;border-radius:8px;font-size:.96rem;
}
.btn:hover{background:#d99a3c;color:#1d1406}
.btn-ghost{
  display:inline-block;border:1px solid #4f7d78;color:#d9e9e6;
  padding:11px 22px;border-radius:8px;font-size:.96rem;margin-left:10px;
}
.btn-ghost:hover{background:#17544e;color:#fff}

/* ---------- sections ---------- */
.section{padding:52px 0}
.section-head{margin-bottom:30px;max-width:44em}
.section-head h2{font-size:1.62rem;margin-bottom:.35em}
.section-head p{color:var(--ink-soft);margin:0;font-size:.98rem}
.section-alt{background:#fff;border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}

.cat-wall{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.cat-card{
  display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 22px 20px;transition:border-color .2s ease,transform .2s ease;
}
.cat-card:hover{border-color:var(--teal);transform:translateY(-2px)}
.cat-card h3{font-size:1.1rem;margin-bottom:.35em}
.cat-card p{margin:0;color:var(--ink-soft);font-size:.92rem;line-height:1.7}
.cat-card .count{display:block;margin-top:.9em;font-size:.8rem;color:var(--amber);letter-spacing:.08em}

.feature-split{display:grid;grid-template-columns:1.15fr .85fr;gap:34px;align-items:start}
.feature-lead{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.feature-lead img{aspect-ratio:16/9;object-fit:cover;width:100%}
.feature-lead .body{padding:24px 26px 26px}
.feature-lead h3{font-size:1.35rem;margin-bottom:.4em}
.feature-lead p{color:var(--ink-soft);margin:0 0 1em}

.side-list{list-style:none;margin:0;padding:0}
.side-list li{border-bottom:1px solid var(--line-soft);padding:14px 0}
.side-list li:first-child{padding-top:0}
.side-list a{font-family:var(--font-serif);font-size:1.02rem;color:var(--teal-deep);display:block}
.side-list span{display:block;color:#7b8f8c;font-size:.82rem;margin-top:3px}

.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  display:flex;flex-direction:column;
}
.card img{aspect-ratio:4/3;object-fit:cover;width:100%}
.card-body{padding:18px 20px 22px;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:1.06rem;margin-bottom:.4em}
.card-body p{margin:0 0 1em;color:var(--ink-soft);font-size:.9rem;line-height:1.68}
.card-meta{margin-top:auto;font-size:.78rem;color:#7b8f8c;letter-spacing:.04em}

.fact-strip{
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;
}
.fact{padding:20px 22px;border-right:1px solid var(--line-soft)}
.fact:last-child{border-right:0}
.fact strong{display:block;font-family:var(--font-serif);font-size:1.5rem;color:var(--amber)}
.fact span{font-size:.86rem;color:var(--ink-soft)}

/* ---------- article layout ---------- */
.breadcrumb{
  font-size:.84rem;color:#7b8f8c;padding:16px 0 0;
}
.breadcrumb a{color:var(--ink-soft)}
.breadcrumb span{margin:0 6px;color:#b7c5c2}

.doc-layout{
  display:grid;grid-template-columns:230px minmax(0,1fr) 268px;gap:34px;
  align-items:start;padding:22px 0 56px;
}
.doc-nav{position:sticky;top:18px;font-size:.9rem}
.doc-nav h4{font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:#7b8f8c;font-family:var(--font-sans);margin-bottom:.9em}
.doc-nav ul{list-style:none;margin:0;padding:0;border-left:2px solid var(--line-soft)}
.doc-nav li a{display:block;padding:7px 0 7px 14px;color:var(--ink-soft);border-left:2px solid transparent;margin-left:-2px}
.doc-nav li a:hover{color:var(--teal)}
.doc-nav li a.is-current{color:var(--teal-deep);font-weight:600;border-left-color:var(--amber)}

.article-main{min-width:0}
.article-main h1{font-size:2rem;margin-bottom:.5em}
.article-lead{font-size:1.05rem;color:var(--ink-soft);margin:0 0 1.4em;padding-bottom:1.2em;border-bottom:1px solid var(--line-soft)}
.byline{display:flex;flex-wrap:wrap;gap:14px;font-size:.83rem;color:#7b8f8c;margin-bottom:1.6em}
.byline span::before{content:"";display:inline-block;width:4px;height:4px;border-radius:50%;background:var(--amber);margin-right:7px;vertical-align:middle}
.article-main figure{margin:0 0 1.7em}
.article-main figure img{border-radius:var(--radius)}
.article-main figcaption{font-size:.8rem;color:#7b8f8c;margin-top:.6em;line-height:1.6}
.article-body h2{font-size:1.34rem;margin:1.9em 0 .7em}
.article-body h3{font-size:1.1rem;margin:1.5em 0 .5em}
.article-body p{margin:0 0 1.15em}
.article-body ul,.article-body ol{margin:0 0 1.2em;padding-left:1.35em}
.article-body li{margin-bottom:.45em}
.article-body blockquote{
  margin:1.6em 0;padding:14px 20px;border-left:3px solid var(--amber);
  background:var(--amber-pale);border-radius:0 8px 8px 0;color:var(--ink-soft);
}
.table-wrap{overflow-x:auto;margin:0 0 1.6em}
table{border-collapse:collapse;width:100%;font-size:.92rem;background:#fff}
th,td{border:1px solid var(--line);padding:10px 13px;text-align:left}
th{background:var(--teal-pale);color:var(--teal-deep);font-weight:600}
.callout{
  border:1px solid var(--line);border-left:3px solid var(--teal);
  background:#fff;border-radius:0 8px 8px 0;padding:16px 20px;margin:0 0 1.6em;font-size:.94rem;color:var(--ink-soft);
}
.article-aside{position:sticky;top:18px}
.aside-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 20px 8px;margin-bottom:20px}
.aside-box h3{font-size:.95rem;font-family:var(--font-sans);letter-spacing:.06em;color:var(--teal-deep);margin-bottom:.9em;padding-bottom:.7em;border-bottom:1px solid var(--line-soft)}
.aside-box ul{list-style:none;margin:0;padding:0}
.aside-box li{padding:0 0 14px}
.aside-box li a{font-size:.91rem;line-height:1.6;color:var(--ink);display:block}
.aside-box li a:hover{color:var(--amber)}
.aside-box .aside-meta{display:block;font-size:.76rem;color:#7b8f8c;margin-top:3px}
.aside-note{font-size:.86rem;color:var(--ink-soft);line-height:1.7}

.prevnext{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:2.4em;border-top:1px solid var(--line-soft);padding-top:1.6em}
.prevnext a{display:block;border:1px solid var(--line);border-radius:9px;padding:14px 16px;font-size:.9rem;color:var(--ink-soft);background:#fff}
.prevnext a:hover{border-color:var(--teal);color:var(--teal)}
.prevnext strong{display:block;font-size:.74rem;letter-spacing:.1em;color:#8fa3a0;text-transform:uppercase;margin-bottom:.4em}

/* ---------- category page ---------- */
.cat-hero{background:var(--teal-pale);border-bottom:1px solid var(--line);padding:38px 0 34px}
.cat-hero h1{font-size:1.9rem;margin-bottom:.35em}
.cat-hero p{max-width:46em;color:var(--ink-soft);margin:0}
.list-page{padding:40px 0 60px;display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:38px;align-items:start}
.cat-item{
  display:grid;grid-template-columns:186px minmax(0,1fr);gap:20px;
  padding:22px 0;border-bottom:1px solid var(--line-soft);
}
.cat-item:first-child{padding-top:0}
.cat-item img{border-radius:8px;aspect-ratio:4/3;object-fit:cover;width:100%}
.cat-item h2{font-size:1.16rem;margin-bottom:.35em}
.cat-item p{margin:0 0 .7em;color:var(--ink-soft);font-size:.92rem}
.cat-item .card-meta{font-size:.78rem}

/* ---------- footer ---------- */
.site-footer{background:var(--teal-deep);color:#b9d1cd;padding:44px 0 26px;font-size:.9rem}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:30px;padding-bottom:28px;border-bottom:1px solid #1d4f4a}
.site-footer h4{color:#fff;font-family:var(--font-sans);font-size:.86rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:1em}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:.55em}
.site-footer a{color:#b9d1cd}
.site-footer a:hover{color:#fff}
.footer-brand{display:flex;gap:12px;align-items:flex-start;margin-bottom:1em}
.footer-brand img{width:38px;height:38px;border-radius:7px}
.footer-brand strong{color:#fff;font-family:var(--font-serif);font-size:1.05rem;display:block}
.footer-about p{margin:0;line-height:1.75;color:#9dbcb8;font-size:.86rem}
.footer-meta{display:flex;flex-wrap:wrap;gap:8px 20px;padding-top:20px;font-size:.8rem;color:#8dadA9;justify-content:space-between}
.footer-meta a{color:#8dadA9}

@media (max-width:1024px){
  .doc-layout{grid-template-columns:1fr;}
  .doc-nav{position:static;border-bottom:1px solid var(--line-soft);padding-bottom:14px}
  .doc-nav ul{border-left:0;display:flex;flex-wrap:wrap;gap:6px}
  .doc-nav li a{border:1px solid var(--line);border-radius:7px;padding:6px 11px;margin:0;font-size:.84rem}
  .doc-nav li a.is-current{border-color:var(--amber)}
  .article-aside{position:static}
  .list-page{grid-template-columns:1fr}
  .hero-grid{grid-template-columns:1fr}
  .feature-split{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  body{font-size:16px}
  .nav-toggle{display:inline-block}
  .site-nav{width:100%;display:none}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:2px;padding-bottom:10px}
  .cat-wall,.card-grid{grid-template-columns:1fr}
  .fact-strip{grid-template-columns:1fr 1fr}
  .fact:nth-child(2){border-right:0}
  .hero h1{font-size:1.72rem}
  .hero{padding:38px 0 34px}
  .section{padding:38px 0}
  .article-main h1{font-size:1.6rem}
  .cat-item{grid-template-columns:1fr}
  .prevnext{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .btn-ghost{margin-left:0;margin-top:10px}
}