:root{
  --teal:#0f6b5c;
  --teal-dark:#0a4a40;
  --teal-deep:#073a33;
  --cream:#faf6ef;
  --cream-2:#f1e9db;
  --ink:#1f2b28;
  --ink-soft:#4c5a56;
  --line:#ded5c3;
  --white:#ffffff;
  --accent:#d97b3c;
  --radius:14px;
  --shadow:0 8px 24px rgba(15,107,92,.12);
  --maxw:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",system-ui,sans-serif;
  color:var(--ink);background:var(--cream);line-height:1.75;font-size:16px;
}
a{color:var(--teal);text-decoration:none}
a:hover{color:var(--accent)}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* header */
.site-header{
  background:var(--teal-deep);color:var(--cream);position:sticky;top:0;z-index:50;
  box-shadow:0 2px 10px rgba(0,0,0,.15);
}
.header-inner{display:flex;align-items:center;gap:28px;height:76px}
.brand{display:flex;align-items:center;gap:12px}
.brand img{height:44px;width:44px;object-fit:contain;border-radius:10px;background:var(--cream)}
.brand-text{line-height:1.25}
.brand-text strong{font-size:20px;letter-spacing:.5px;display:block}
.brand-text span{font-size:12px;opacity:.75}
.main-nav{display:flex;gap:4px;margin-left:auto}
.main-nav a{color:var(--cream-2);padding:8px 12px;border-radius:8px;font-size:15px;white-space:nowrap}
.main-nav a:hover{color:#fff;background:rgba(255,255,255,.08)}
.main-nav a.active{background:var(--teal);color:#fff}
.header-cta{background:var(--accent);color:#fff;padding:9px 18px;border-radius:30px;font-size:14px;font-weight:600}
.header-cta:hover{color:#fff;background:#c8692f}

/* layout: left rail + main */
.layout{display:grid;grid-template-columns:230px 1fr;gap:28px;padding:28px 0;align-items:start}
.side-rail{position:sticky;top:100px;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.side-rail h3{font-size:14px;letter-spacing:2px;color:var(--teal);margin-bottom:12px;text-transform:uppercase}
.rail-list{list-style:none}
.rail-list li{margin-bottom:6px}
.rail-list a{display:block;padding:9px 12px;border-radius:9px;color:var(--ink-soft);font-size:15px;border-left:3px solid transparent}
.rail-list a:hover{background:var(--cream-2);color:var(--teal);border-left-color:var(--teal)}
.rail-list a.active{background:var(--teal);color:#fff;border-left-color:var(--teal-dark)}
.rail-note{margin-top:14px;padding-top:14px;border-top:1px solid var(--line);font-size:12px;color:var(--ink-soft)}

.main-col{min-width:0}

/* hero */
.hero{background:linear-gradient(135deg,var(--teal-deep),var(--teal));color:var(--cream);border-radius:var(--radius);overflow:hidden;display:grid;grid-template-columns:1.2fr 1fr;gap:20px;margin-bottom:28px}
.hero-copy{padding:34px 30px}
.hero-copy h1{font-size:32px;line-height:1.3;margin-bottom:14px}
.hero-copy h1 span{color:var(--accent)}
.hero-copy p{font-size:15px;opacity:.9;margin-bottom:22px;max-width:52ch}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:11px 22px;border-radius:30px;font-weight:600;font-size:15px}
.btn-primary{background:var(--accent);color:#fff}
.btn-ghost{border:1.5px solid var(--cream-2);color:var(--cream)}
.btn-ghost:hover{background:rgba(255,255,255,.1);color:#fff}
.hero-media{padding:20px}
.hero-media img{height:100%;width:100%;object-fit:cover;border-radius:10px}

/* section headers */
.section-h{display:flex;align-items:baseline;justify-content:space-between;margin:30px 0 14px}
.section-h h2{font-size:22px;color:var(--teal-deep)}
.section-h .more{font-size:14px;color:var(--teal)}

/* feature cards (numbered, 2-col) */
.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.feature-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:grid;grid-template-columns:1fr;transition:transform .2s}
.feature-card:hover{transform:translateY(-3px)}
.feature-card .fc-media{aspect-ratio:16/9;overflow:hidden}
.feature-card .fc-media img{width:100%;height:100%;object-fit:cover}
.feature-card .fc-body{padding:16px 18px}
.feature-card .fc-body h3{font-size:17px;margin-bottom:6px}
.feature-card .fc-body p{font-size:14px;color:var(--ink-soft)}
.feature-card .fc-body a{font-size:13px;font-weight:600}

/* category grid */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.cat-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);border-top:4px solid var(--teal)}
.cat-card:nth-child(2){border-top-color:var(--accent)}
.cat-card:nth-child(3){border-top-color:#5b7a9c}
.cat-card:nth-child(4){border-top-color:#8a6bbd}
.cat-card:nth-child(5){border-top-color:#c0663d}
.cat-card:nth-child(6){border-top-color:#4d8f6e}
.cat-card h3{font-size:17px;margin-bottom:4px}
.cat-card p{font-size:13.5px;color:var(--ink-soft);min-height:3em;margin-bottom:10px}
.cat-card a{font-size:13.5px;font-weight:600}

/* article list */
.article-list{display:flex;flex-direction:column;gap:14px}
.article-item{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow);display:grid;grid-template-columns:130px 1fr;gap:16px;align-items:center}
.article-item .ai-media{aspect-ratio:4/3;overflow:hidden;border-radius:8px}
.article-item .ai-media img{width:100%;height:100%;object-fit:cover}
.article-item h3{font-size:17px;margin-bottom:5px}
.article-item h3 a{color:var(--ink)}
.article-item h3 a:hover{color:var(--teal)}
.article-item p{font-size:13.5px;color:var(--ink-soft)}
.article-item .ai-meta{font-size:12.5px;color:var(--ink-soft);margin-top:6px}
.article-item .cat-tag{display:inline-block;background:var(--cream-2);color:var(--teal);font-size:12px;padding:2px 9px;border-radius:20px;margin-right:8px}

/* footer */
.site-footer{background:var(--teal-deep);color:var(--cream-2);padding:26px 0;margin-top:40px}
.footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;align-items:center}
.footer-nav a{color:var(--cream-2);margin-right:14px;font-size:14px}
.footer-nav a:hover{color:#fff}
.footer-copy{font-size:12.5px;opacity:.8}
.footer-links{display:flex;gap:14px;font-size:12.5px}
.footer-links a{color:var(--cream-2);text-decoration:underline}

/* article page */
.article-wrap{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:34px 38px;box-shadow:var(--shadow)}
.breadcrumb{font-size:13px;color:var(--ink-soft);margin-bottom:14px}
.breadcrumb a{color:var(--teal)}
.article-wrap h1{font-size:28px;line-height:1.4;margin-bottom:8px}
.art-meta{font-size:13px;color:var(--ink-soft);margin-bottom:22px;border-bottom:1px solid var(--line);padding-bottom:16px}
.art-lead{font-size:16.5px;color:var(--ink-soft);background:var(--cream-2);border-left:4px solid var(--teal);padding:14px 18px;border-radius:6px;margin-bottom:20px}
.article-wrap h2{font-size:21px;color:var(--teal-deep);margin:26px 0 10px;padding-bottom:6px;border-bottom:1px dashed var(--line)}
.article-wrap h3{font-size:18px;color:var(--ink);margin:20px 0 8px}
.article-wrap p{margin-bottom:14px}
.article-wrap ul,.article-wrap ol{margin:0 0 16px 22px}
.article-wrap li{margin-bottom:6px}
.article-wrap img{width:100%;border-radius:10px;margin:8px 0 14px}
.article-wrap table{width:100%;border-collapse:collapse;margin:16px 0}
.article-wrap th,.article-wrap td{border:1px solid var(--line);padding:10px 12px;font-size:14px;text-align:left}
.article-wrap th{background:var(--cream-2);color:var(--teal-deep)}
.callout{background:var(--cream-2);border-radius:10px;padding:14px 18px;margin:16px 0;font-size:14.5px}
.callout strong{color:var(--teal)}
.article-grid{display:grid;grid-template-columns:1fr 260px;gap:26px}
.related-box{position:sticky;top:100px;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.related-box h4{font-size:15px;color:var(--teal-deep);margin-bottom:12px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.related-box ol{list-style:none;margin:0}
.related-box li{margin-bottom:12px;padding-bottom:10px;border-bottom:1px dashed var(--line);font-size:14px}
.related-box li:last-child{border-bottom:none}
.related-box li a{color:var(--ink);line-height:1.5}
.related-box li a:hover{color:var(--teal)}

/* category page */
.cat-head{background:linear-gradient(135deg,var(--teal),var(--teal-dark));color:var(--cream);border-radius:var(--radius);padding:26px 30px;margin-bottom:22px}
.cat-head h1{font-size:26px;margin-bottom:6px}
.cat-head p{font-size:14.5px;opacity:.9;max-width:60ch}

@media(max-width:960px){
  .layout{grid-template-columns:1fr}
  .side-rail{position:static}
  .hero{grid-template-columns:1fr}
  .feature-grid,.cat-grid{grid-template-columns:1fr}
  .article-grid{grid-template-columns:1fr}
  .main-nav{display:none}
}