:root{
  --ink:#12181c;
  --ink-soft:#3b4a53;
  --slate:#1b252b;
  --slate-2:#243038;
  --paper:#f4f2ed;
  --paper-2:#e8e5dd;
  --grass:#2f8f4e;
  --grass-soft:#7dbb8f;
  --line:#d6d2c8;
  --amber:#c98a2e;
  --radius:14px;
  --max:1180px;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16.5px;
  line-height:1.85;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--grass);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.35;letter-spacing:-.01em}
h1{font-size:2.05rem;margin:.2em 0 .5em}
h2{font-size:1.32rem;margin:2em 0 .6em;padding-top:.2em}
h3{font-size:1.1rem;margin:1.5em 0 .4em}
p{margin:0 0 1.05em}
ul,ol{padding-left:1.3em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* ---------- header ---------- */
.site-head{
  background:var(--slate);
  color:#e9efe9;
  border-bottom:3px solid var(--grass);
  position:sticky;
  top:0;
  z-index:60;
}
.head-in{
  max-width:var(--max);
  margin:0 auto;
  padding:12px 20px;
  display:flex;
  align-items:center;
  gap:18px;
}
.brand{display:flex;align-items:center;gap:11px;color:#f2f6f2;text-decoration:none}
.brand img{width:42px;height:42px;border-radius:9px;border:1px solid rgba(255,255,255,.18)}
.brand-name{font-size:1.12rem;font-weight:700;letter-spacing:.04em}
.brand-tag{display:block;font-size:.7rem;font-weight:400;color:var(--grass-soft);letter-spacing:.12em}
.nav-top{margin-left:auto;display:flex;gap:2px;flex-wrap:wrap}
.nav-top a{
  color:#d8e2d8;
  font-size:.9rem;
  padding:8px 11px;
  border-radius:8px;
  text-decoration:none;
  white-space:nowrap;
}
.nav-top a:hover,.nav-top a.is-active{background:rgba(47,143,78,.24);color:#fff;text-decoration:none}
.burger{
  display:none;
  margin-left:auto;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.18);
  color:#fff;
  border-radius:9px;
  padding:8px 12px;
  font-size:.9rem;
  cursor:pointer;
  min-height:40px;
}

/* ---------- layout primitives ---------- */
.mag-grid{
  display:grid;
  grid-template-columns:2fr 1fr;
  gap:34px;
  align-items:start;
}
.rail{display:grid;gap:22px}
.card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:20px 22px;
}
.card.dark{background:var(--slate-2);color:#e7ede7;border-color:#324049}
.card.dark a{color:#bfe2c7}
.eyebrow{
  display:inline-block;
  font-size:.74rem;
  letter-spacing:.18em;
  color:var(--grass);
  font-weight:700;
  text-transform:uppercase;
}
.mini-note{font-size:.86rem;color:var(--ink-soft)}

/* ---------- home: left data rail ---------- */
.home-top{
  display:grid;
  grid-template-columns:300px 1fr;
  gap:30px;
  padding:30px 0 8px;
  align-items:start;
}
.data-rail{
  background:var(--slate);
  color:#eaf0ea;
  border-radius:var(--radius);
  padding:22px 20px;
  position:relative;
  overflow:hidden;
}
.data-rail::before{
  content:"";
  position:absolute;
  inset:auto -30% -40% auto;
  width:240px;height:240px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(47,143,78,.35),transparent 70%);
}
.data-rail h2{font-size:.95rem;letter-spacing:.14em;color:var(--grass-soft);margin:0 0 14px}
.meter{margin-bottom:16px}
.meter-top{display:flex;justify-content:space-between;font-size:.83rem;color:#c8d4c8}
.meter-bar{height:6px;border-radius:4px;background:rgba(255,255,255,.14);overflow:hidden;margin-top:7px}
.meter-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--grass),var(--grass-soft))}
.hero-block{position:relative;border-radius:var(--radius);overflow:hidden}
.hero-block img{width:100%;aspect-ratio:16/9;object-fit:cover}
.hero-copy{
  position:absolute;
  inset:auto 0 0 0;
  padding:26px 26px 22px;
  background:linear-gradient(to top,rgba(10,16,19,.92),rgba(10,16,19,.45) 62%,transparent);
  color:#f3f7f3;
}
.hero-copy h1{font-size:1.9rem;margin:.2em 0 .35em;color:#fff}
.hero-copy p{margin:0;color:#dbe5db;font-size:.95rem}
.hero-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.btn{
  display:inline-block;
  background:var(--grass);
  color:#fff;
  padding:9px 18px;
  border-radius:999px;
  font-size:.9rem;
  text-decoration:none;
}
.btn:hover{background:#257a41;text-decoration:none;color:#fff}
.btn.ghost{background:transparent;border:1px solid rgba(255,255,255,.45);color:#eef4ee}
.btn.ghost:hover{background:rgba(255,255,255,.12);color:#fff}

/* ---------- sections ---------- */
section{scroll-margin-top:78px}
.sec-head{
  display:flex;
  align-items:baseline;
  gap:14px;
  border-bottom:1px solid var(--line);
  padding-bottom:10px;
  margin:44px 0 22px;
}
.sec-head h2{margin:0;font-size:1.24rem}
.sec-head .sec-nav{margin-left:auto;font-size:.86rem}

.split-posts{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.split-posts .post{padding:0;overflow:hidden}
.post-img{display:block;overflow:hidden}
.post-img img{width:100%;aspect-ratio:5/3;object-fit:cover;transition:transform .5s ease}
.post:hover .post-img img{transform:scale(1.04)}
.post-body{padding:16px 20px 20px}
.post-body h3{font-size:1.06rem;margin:.35em 0 .4em}
.post-body h3 a{color:var(--ink);text-decoration:none}
.post-body h3 a:hover{color:var(--grass);text-decoration:none}
.post-body p{font-size:.92rem;color:var(--ink-soft);margin:0}

.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:20px}
.tile{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 20px;
}
.tile .fail{display:block;font-size:.74rem;letter-spacing:.14em;color:var(--amber)}

.offer-strip{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:0;
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
  background:#fff;
}
.offer-strip > div{padding:22px 24px;border-right:1px solid var(--line)}
.offer-strip > div:last-child{border-right:0}
.offer-strip strong{display:block;font-size:1.5rem;color:var(--slate);line-height:1.3}
.offer-strip span{font-size:.86rem;color:var(--ink-soft)}

.method-flow{
  list-style:none;
  padding:0;
  margin:0;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
  counter-reset:step;
}
.method-flow li{
  background:#fff;
  border:1px solid var(--line);
  border-top:3px solid var(--grass);
  border-radius:12px;
  padding:18px 18px 20px;
  counter-increment:step;
  position:relative;
}
.method-flow li::before{
  content:counter(step);
  font-size:1.5rem;
  font-weight:700;
  color:var(--paper-2);
  position:absolute;
  top:8px;right:14px;
}
.method-flow strong{display:block;margin-bottom:.35em}
.method-flow p{font-size:.88rem;color:var(--ink-soft);margin:0}

.wide-feature{
  display:grid;
  grid-template-columns:1.1fr 1fr;
  gap:0;
  border-radius:var(--radius);
  overflow:hidden;
  background:var(--slate);
  color:#e9efe9;
}
.wide-feature img{height:100%;width:100%;aspect-ratio:4/3;object-fit:cover}
.wide-feature .wf-copy{padding:28px}
.wide-feature h2{color:#fff;margin-top:.2em}
.wide-feature p{color:#cdd9cd;font-size:.94rem}

.timeline{list-style:none;padding:0;margin:0;border-left:2px solid var(--line)}
.timeline li{padding:0 0 20px 22px;position:relative}
.timeline li::before{
  content:"";position:absolute;left:-7px;top:10px;width:12px;height:12px;
  border-radius:50%;background:var(--grass);border:2px solid var(--paper);
}
.timeline time{display:block;font-size:.78rem;letter-spacing:.1em;color:var(--ink-soft)}
.timeline strong{display:block;margin:.2em 0 .15em}
.timeline p{margin:0;font-size:.9rem;color:var(--ink-soft)}

/* ---------- breadcrumbs ---------- */
.crumbs{font-size:.85rem;color:var(--ink-soft);margin:26px 0 6px}
.crumbs a{color:var(--ink-soft)}
.crumbs span{margin:0 7px;color:#a9a396}

/* ---------- category page ---------- */
.cat-head{
  display:grid;
  grid-template-columns:1fr 320px;
  gap:28px;
  align-items:end;
  padding:18px 0 26px;
  border-bottom:1px solid var(--line);
}
.cat-head h1{margin:0 0 .3em}
.cat-head p{margin:0;color:var(--ink-soft);max-width:58ch}
.cat-head img{border-radius:var(--radius);aspect-ratio:16/10;object-fit:cover}
.cat-list{list-style:none;padding:0;margin:26px 0 0;display:grid;gap:18px}
.cat-list li{
  display:grid;
  grid-template-columns:150px 1fr;
  gap:20px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
}
.cat-list img{width:100%;height:100%;aspect-ratio:4/3;object-fit:cover}
.cat-list .cl-body{padding:16px 22px 16px 0}
.cat-list h3{margin:0 0 .3em;font-size:1.05rem}
.cat-list h3 a{color:var(--ink);text-decoration:none}
.cat-list h3 a:hover{color:var(--grass)}
.cat-list p{margin:0;font-size:.9rem;color:var(--ink-soft)}
.cat-list .meta{display:block;font-size:.78rem;color:#8c8577;margin-top:8px;letter-spacing:.06em}

/* ---------- article page ---------- */
.article-shell{
  display:grid;
  grid-template-columns:190px minmax(0,1fr) 292px;
  gap:32px;
  align-items:start;
  padding-bottom:50px;
}
.toc{
  position:sticky;
  top:86px;
  font-size:.86rem;
  border-left:2px solid var(--line);
  padding-left:14px;
}
.toc strong{display:block;font-size:.74rem;letter-spacing:.14em;color:var(--grass);margin-bottom:8px}
.toc a{display:block;color:var(--ink-soft);padding:4px 0;text-decoration:none}
.toc a:hover{color:var(--grass)}
.art-main{min-width:0}
.art-head h1{font-size:1.86rem;margin:.15em 0 .5em}
.art-meta{
  display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;
  font-size:.84rem;color:var(--ink-soft);
  border-bottom:1px solid var(--line);
  padding-bottom:16px;
}
.art-meta .avatar{
  width:34px;height:34px;border-radius:50%;
  background:var(--slate);color:#bfe2c7;
  display:grid;place-items:center;
  font-size:.8rem;font-weight:700;
}
.art-lead{
  font-size:1.04rem;
  color:var(--ink-soft);
  border-left:3px solid var(--grass);
  padding-left:16px;
  margin:22px 0;
}
.figure{margin:26px 0}
.figure img{border-radius:var(--radius);width:100%}
.figure figcaption{font-size:.82rem;color:var(--ink-soft);margin-top:9px}
.prose h2{border-left:4px solid var(--grass);padding-left:12px}
.prose blockquote{
  margin:24px 0;padding:16px 20px;background:var(--paper-2);
  border-radius:12px;color:var(--ink-soft);font-size:.95rem;
}
.prose blockquote p:last-child{margin:0}
.prose table{width:100%;border-collapse:collapse;font-size:.9rem;margin:18px 0}
.prose th,.prose td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.prose th{background:var(--paper-2)}
.art-foot{
  margin-top:34px;padding-top:18px;border-top:1px solid var(--line);
  font-size:.92rem;color:var(--ink-soft);
}
.art-foot a{font-weight:600}
.art-aside{display:grid;gap:20px;position:sticky;top:86px}
.aside-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}
.aside-card h2{font-size:.92rem;letter-spacing:.08em;margin:0 0 12px;color:var(--slate)}
.aside-card ul{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.aside-card li a{display:flex;gap:10px;align-items:flex-start;color:var(--ink);font-size:.9rem;text-decoration:none;line-height:1.6}
.aside-card li img{width:62px;height:46px;object-fit:cover;border-radius:8px;flex:0 0 auto}
.aside-card li a:hover{color:var(--grass)}
.aside-card .side-meta{font-size:.76rem;color:#8c8577;display:block}

/* ---------- article extras ---------- */
.geo-note{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  gap:18px;
  align-items:center;
  margin:30px 0;
  padding:20px 22px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  border-left:4px solid var(--grass);
}
.geo-note h4{margin:0 0 .35em;font-size:1rem;color:var(--slate)}
.geo-note p{margin:0;font-size:.92rem;color:var(--ink-soft)}
.geo-diagram{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.78rem;
  line-height:1.55;
  white-space:pre;
  overflow-x:auto;
  background:var(--slate);
  color:#bfe2c7;
  border-radius:10px;
  padding:14px 16px;
}
.qa-list{display:grid;gap:14px;margin:18px 0 0}
.qa-list .qa,
dl.qa-list dt.qa{background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px 18px;display:block}
.qa-list .qa strong,
dl.qa-list dt.qa strong{display:block;color:var(--slate);margin-bottom:.35em;font-size:.97rem}
.qa-list .qa p,
dl.qa-list dt.qa p{margin:0;font-size:.92rem;color:var(--ink-soft)}

/* ---------- footer ---------- */
.site-foot{background:var(--slate);color:#c7d2c7;margin-top:40px;font-size:.9rem}
.foot-in{
  max-width:var(--max);margin:0 auto;padding:34px 20px 18px;
  display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:26px;
}
.foot-in h2{font-size:.95rem;color:#fff;margin:0 0 10px}
.foot-in a{color:#c7d2c7;text-decoration:none}
.foot-in a:hover{color:#fff}
.foot-in ul{list-style:none;padding:0;margin:0;line-height:2}
.foot-brand{display:flex;gap:12px;align-items:flex-start}
.foot-brand img{width:46px;height:46px;border-radius:9px}
.foot-brand p{margin:0;font-size:.87rem;color:#a9b7a9}
.legal{
  border-top:1px solid rgba(255,255,255,.12);
  max-width:var(--max);margin:0 auto;padding:14px 20px 30px;
  font-size:.82rem;color:#9daa9d;display:flex;flex-wrap:wrap;gap:6px 20px;
}
.legal a{color:#9daa9d}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .article-shell{grid-template-columns:minmax(0,1fr) 268px}
  .toc{display:none}
  .home-top{grid-template-columns:1fr}
  .cat-head{grid-template-columns:1fr}
  .cat-head img{max-width:420px}
}
@media (max-width:768px){
  body{font-size:16px;line-height:1.8}
  .head-in{padding:10px 14px;gap:10px}
  .burger{display:inline-block}
  .nav-top{
    display:none;
    width:100%;
    margin:0;
    flex-direction:column;
    gap:2px;
    padding:8px 0 4px;
    border-top:1px solid rgba(255,255,255,.12);
  }
  .nav-top.open{display:flex}
  .head-in{flex-wrap:wrap}
  .nav-top a{padding:11px 10px;font-size:.95rem}
  .wrap{padding:0 15px}
  .mag-grid,.article-shell,.split-posts,.wide-feature,.foot-in,.offer-strip,.method-flow,.tiles{
    grid-template-columns:1fr;
  }
  .offer-strip > div{border-right:0;border-bottom:1px solid var(--line)}
  .offer-strip > div:last-child{border-bottom:0}
  .art-aside{position:static}
  .cat-list li{grid-template-columns:1fr}
  .cat-list img{aspect-ratio:16/9}
  .cat-list .cl-body{padding:0 18px 18px}
  .hero-copy{position:static;background:var(--slate);padding:18px}
  .hero-copy h1{font-size:1.5rem}
  h1{font-size:1.72rem}
  .art-head h1{font-size:1.6rem}
  .figure img{border-radius:10px}
  .prose table{display:block;overflow-x:auto}
}
@media (prefers-reduced-motion:reduce){
  .post-img img{transition:none}
}