@import url('https://fonts.googleapis.com/css2?family=Barlow+Semi+Condensed:wght@500;700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@500&display=swap');

:root{--ink:#0f2a22;--ink2:#163a2f;--line-dark:#2b5646;--green:#00804a;--mint:#5fd3a0;--muted:#3d544b;--muted-dark:#b9cfc3;--line:#d5e0da;--soft:#f5f8f6;--tint:#e6f4ec}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;font-family:Inter,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.5}
img{max-width:100%;display:block}
a{color:var(--green)}a:hover{color:var(--ink)}
a:focus-visible,button:focus-visible{outline:3px solid var(--mint);outline-offset:3px}
h1,h2,h3{font-family:'Barlow Semi Condensed',sans-serif;font-weight:700;margin:0}
p{margin:0}
.w{max-width:1200px;margin:0 auto;padding:0 40px}
.mono{font-family:'IBM Plex Mono',monospace;font-size:13px;letter-spacing:1.2px;color:var(--green)}
.dark .mono{color:var(--mint)}
.btn{display:inline-block;background:var(--green);color:#fff;text-decoration:none;padding:14px 26px;border-radius:999px;font-weight:500;border:0;font:inherit;font-weight:500;cursor:pointer}
.btn:hover{background:var(--ink);color:#fff}
.btn-ghost{background:none;border:1.5px solid var(--ink);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid #e2e9e5;backdrop-filter:blur(8px)}
.site-header .w{display:flex;align-items:center;justify-content:space-between;gap:24px;height:76px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand img{width:40px;height:38px;object-fit:contain}
.brand span{font-family:'Barlow Semi Condensed',sans-serif;font-weight:700;font-size:26px}
.nav{display:flex;align-items:center;gap:30px;font-size:15px;font-weight:500}
.nav a,.nav button{color:var(--ink);text-decoration:none;background:none;border:0;font:inherit;font-weight:500;cursor:pointer;padding:6px 0;border-bottom:2px solid transparent}
.nav [aria-current="page"],.nav .active{color:var(--green);border-bottom-color:var(--green)}
.nav button svg{margin-left:6px;transition:transform .2s}
.nav button[aria-expanded="true"] svg{transform:rotate(180deg)}
.head-right{display:flex;align-items:center;gap:18px}
.head-tel{font-size:14px;color:var(--muted);text-decoration:none}
.menu-toggle{display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:999px;background:#fff;align-items:center;justify-content:center;cursor:pointer}

/* Mega menu */
.mega{display:none;position:absolute;left:0;right:0;top:76px;background:#fff;box-shadow:0 18px 40px rgba(15,42,34,.18)}
.mega.open{display:block}
.mega .w{display:grid;grid-template-columns:repeat(4,minmax(0,1fr)) 300px;gap:24px;padding-top:32px;padding-bottom:36px;height:auto}
.mega-item{display:flex;flex-direction:column;gap:10px;padding:20px;border-radius:6px;color:var(--ink);text-decoration:none}
.mega-item:hover,.mega-item.current{background:var(--tint);color:var(--ink)}
.mega-item strong{font-family:'Barlow Semi Condensed',sans-serif;font-size:22px;line-height:1.15}
.mega-item span:last-child{font-size:14px;color:var(--muted)}
.mega-help{padding:20px 24px;background:var(--ink);color:#fff;border-radius:6px;display:flex;flex-direction:column;gap:12px}
.mega-help a{margin-top:auto;color:var(--mint);font-weight:500}

/* Mobile menu */
.mobile-menu{display:none}
@media (max-width:960px){
.nav,.head-tel{display:none}
.menu-toggle{display:flex}
.head-right .btn{display:none}
.mobile-menu{position:fixed;inset:64px 0 0 0;background:#fff;z-index:49;flex-direction:column;overflow-y:auto}
.mobile-menu.open{display:flex}
.mobile-menu nav{padding:12px 20px;flex-grow:1}
.mobile-menu a.sub{display:flex;gap:14px;align-items:center;min-height:52px;border-bottom:1px solid #edf2ef;color:var(--ink);text-decoration:none;font-size:17px}
.mobile-menu a.sub span{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--muted)}
.mobile-menu a.main{display:flex;align-items:center;min-height:56px;border-bottom:1px solid #edf2ef;color:var(--ink);text-decoration:none;font-size:20px;font-weight:500}
.mobile-menu .cta{padding:20px;background:var(--ink);display:flex;flex-direction:column;gap:12px}
.mobile-menu .cta a{display:flex;justify-content:center;align-items:center;min-height:52px;border-radius:999px;text-decoration:none;font-weight:500}
.mobile-menu .cta a:first-child{background:var(--green);color:#fff}
.mobile-menu .cta a:last-child{border:1.5px solid var(--mint);color:#fff}
.site-header .w{height:64px}
.mega{top:64px}
}

/* Home */
.hero{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:48px;align-items:end;padding-top:88px;padding-bottom:40px;position:relative;z-index:2}
.hero h1{font-size:clamp(46px,6vw,76px);line-height:.98;letter-spacing:-.5px}
.hero .lead{margin:26px 0 34px;font-size:19px;line-height:1.6;color:var(--muted);max-width:560px}
.btns{display:flex;gap:14px;flex-wrap:wrap}
.hero-media{position:relative;height:560px;border-radius:6px;overflow:hidden}
.hero-media>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:50% 40%;filter:saturate(.75)}
.hero-media::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,42,34,0) 45%,rgba(15,42,34,.55) 100%)}
.card-person{position:absolute;left:20px;right:20px;bottom:20px;z-index:1;display:flex;gap:18px;align-items:center;padding:18px;background:#fff;border-radius:6px}
.card-person img{width:84px;height:100px;object-fit:cover;border-radius:4px}
.card-person p{font-size:14px;color:var(--muted)}
.card-person strong{font-size:17px;display:block;color:var(--ink)}
.mountains{display:block;width:100%;height:400px;margin-top:-60px}
.dark{background:var(--ink);color:#fff}
.route{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border-top:2px solid var(--mint);margin-bottom:72px;padding-top:0}
.route a{display:flex;flex-direction:column;gap:10px;color:#fff;text-decoration:none}
.route a::before{content:'';width:16px;height:16px;margin-top:-9px;border-radius:50%;background:var(--ink);border:2px solid var(--mint)}
.route a span{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--mint)}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:32px;flex-wrap:wrap;margin-bottom:40px}
.section-head h2{font-size:clamp(36px,4vw,52px);line-height:1.02}
.section-head p{max-width:420px;font-size:16px;line-height:1.6;color:var(--muted-dark)}
.g4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.svc{display:flex;flex-direction:column;background:var(--ink2);border:1px solid var(--line-dark);border-radius:6px;color:#fff;text-decoration:none;overflow:hidden;padding-bottom:28px}
.svc img{width:100%;height:150px;object-fit:cover;filter:saturate(.6);margin-bottom:24px}
.svc>div{display:flex;flex-direction:column;gap:14px;padding:0 24px;flex-grow:1}
.svc .n{font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--mint)}
.svc h3{font-size:26px;line-height:1.1}
.svc p{font-size:14px;line-height:1.6;color:var(--muted-dark);flex-grow:1}
.svc .more{font-size:14px;font-weight:500;color:var(--mint)}
.svc:hover{border-color:var(--mint);color:#fff}
.g2{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:56px;align-items:center}
.pad{padding-top:100px;padding-bottom:100px}
.soft{background:var(--soft)}
.h2{font-size:46px;line-height:1.05;margin:16px 0 20px}
.body{font-size:17px;line-height:1.65;color:var(--muted)}
.fig{margin:0;padding:28px;background:#fff;border:1px solid var(--line);border-radius:6px}
.fig img{width:100%;height:auto;aspect-ratio:298/123;object-fit:contain}
.fig figcaption{margin-top:14px;font-size:13px;color:var(--muted)}
.g3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.box{padding:28px;border:1px solid var(--line);border-radius:6px}
.box h3{font-size:28px;margin-bottom:10px}
.box p{font-size:15px;line-height:1.6;color:var(--muted)}
.papers a{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:26px 0;border-top:1px solid var(--line);color:var(--ink);text-decoration:none}
.papers a:last-child{border-bottom:1px solid var(--line)}
.papers .meta{font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--muted);min-width:120px}
.papers .t{font-size:22px;font-weight:500}
.papers a:hover .t{color:var(--green)}
.contact-links{display:flex;flex-direction:column;gap:14px}
.contact-links a{display:flex;justify-content:space-between;padding:22px 24px;background:var(--ink2);border-radius:6px;color:#fff;text-decoration:none;font-size:20px}
.contact-links a span{color:var(--mint)}
.contact-links a:hover{background:#1d4a3c;color:#fff}
.footer{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;padding-top:24px;padding-bottom:32px;border-top:1px solid var(--line-dark);font-size:13px;color:var(--muted-dark)}
.footer a{color:var(--muted-dark)}
.footer div{display:flex;gap:24px}

/* Detail pages */
.page-hero{position:relative;overflow:hidden}
.page-hero>img{position:absolute;right:0;top:0;width:55%;height:100%;object-fit:cover;filter:saturate(.6)}
.page-hero::after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#0f2a22 45%,rgba(15,42,34,.55) 75%,rgba(15,42,34,.25) 100%)}
.page-hero .w{position:relative;z-index:1;padding-top:28px;padding-bottom:72px}
.crumbs{display:flex;gap:10px;font-size:14px;color:var(--muted-dark);margin-bottom:56px;flex-wrap:wrap}
.crumbs a{color:var(--muted-dark)}
.crumbs span:last-child{color:#fff}
.page-hero h1{font-size:clamp(44px,6vw,72px);line-height:1;margin:12px 0 22px}
.page-hero .lead{max-width:640px;font-size:19px;line-height:1.6;color:#d5e4dc}
.layout{display:flex;flex-wrap:wrap;gap:64px;padding-top:72px;padding-bottom:72px}
.side{flex:1 1 240px;max-width:280px;display:flex;flex-direction:column;gap:28px}
.side p{font-size:13px;font-weight:600;color:var(--muted);margin-bottom:12px}
.toc a{display:block;padding:10px 0 10px 14px;border-left:2px solid var(--line);color:var(--ink);text-decoration:none;font-size:15px}
.toc a:first-of-type,.toc a:hover{border-left-color:var(--green)}
.sib a{display:block;padding:8px 0;font-size:15px}
.sib a[aria-current="page"]{color:var(--ink);font-weight:600;text-decoration:none}
.content{flex:999 1 560px;min-width:0}
.content .fig{margin-bottom:48px;background:var(--soft);border:0}
.block{padding:32px 0;border-top:1px solid var(--line)}
.block h2{font-size:32px;margin-bottom:14px}
.block p{font-size:17px;line-height:1.7;color:var(--muted);margin-bottom:12px}
.source{font-size:14px;color:var(--muted)}
.ask{display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-top:32px;padding:28px 32px;background:var(--tint);border-radius:6px}
.ask p{font-size:18px;font-weight:500}
.pager{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;padding-bottom:80px}
.pager a{display:flex;flex-direction:column;gap:6px;padding:24px;border:1px solid var(--line);border-radius:6px;color:var(--ink);text-decoration:none}
.pager a:last-child{text-align:right}
.pager a span:first-child{font-size:13px;color:var(--muted)}
.pager a span:last-child{font-size:18px;font-weight:500}
.pager a:hover{border-color:var(--green)}
.page-footer{background:var(--ink);color:var(--muted-dark)}
.page-footer .footer{border-top:0}

@media (max-width:960px){
.hero,.g2{grid-template-columns:1fr}
.hero-media{height:420px}
.g4{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:1fr}
.route{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.side{max-width:none}
.page-hero>img{width:100%;opacity:.35}
}
@media (max-width:560px){
.w{padding:0 20px}
.g4,.pager{grid-template-columns:1fr}
.h2{font-size:36px}
.mountains{height:220px;margin-top:-30px}
.papers .t{font-size:18px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}