@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{--green:#008048;--ink:#172a24;--muted:#4f5f58;--line:#d4dfd9;--pale:#f2f6f3;--tint:#e7f3ec}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;font-family:'IBM Plex Sans',Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.6}
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(--green);outline-offset:3px}
h1,h2,h3{margin:0;letter-spacing:-.025em;line-height:1.1}
p{margin:0}
.w{max-width:1200px;margin:0 auto;padding:0 40px}
.mono{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:1.3px;color:var(--green);font-weight:500}
.btn{display:inline-block;background:var(--green);color:#fff;text-decoration:none;padding:13px 26px;border-radius:999px;font-weight:500;font-size:15px}
.btn:hover{background:var(--ink);color:#fff}
.btn-line{background:none;color:var(--ink);border:1.5px solid var(--ink)}
.btn-line:hover{background:var(--ink);color:#fff}
.lines{position:relative;isolation:isolate}
.lines::before{content:'';position:absolute;inset:0;z-index:-1;background:url('../assets/cable-lines.svg') center top/1440px 1100px no-repeat;opacity:.8;pointer-events:none}

.has-img{position:relative;overflow:hidden}
.hero-img{position:absolute;right:0;top:0;width:48%;height:100%;object-fit:cover;filter:grayscale(1) contrast(.9);opacity:.5;z-index:-1;-webkit-mask-image:linear-gradient(90deg,transparent 0%,#000 55%);mask-image:linear-gradient(90deg,transparent 0%,#000 55%);pointer-events:none}
.has-img>.w{position:relative}
.tile-img{margin:-24px -24px 20px;width:calc(100% + 48px);max-width:none;height:140px;object-fit:cover;filter:grayscale(1);opacity:.85;transition:filter .3s,opacity .3s}
.tile:hover .tile-img{filter:grayscale(0);opacity:1}

/* Header (shared markup with Variant B) */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);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:44px;height:42px;object-fit:contain}
.brand span{font-size:27px;font-weight:600;letter-spacing:-1px}
.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 a:hover,.nav button:hover{color:var(--green)}
.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{display:none;position:absolute;left:0;right:0;top:76px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 18px 40px rgba(23,42,36,.12)}
.mega.open{display:block}
.mega .w{display:grid;grid-template-columns:repeat(4,minmax(0,1fr)) 280px;gap:20px;padding-top:28px;padding-bottom:32px;height:auto}
.mega-item{display:flex;flex-direction:column;gap:8px;padding:18px;border:1px solid var(--line);color:var(--ink);text-decoration:none}
.mega-item:hover,.mega-item.current{border-color:var(--green);background:var(--tint)}
.mega-item strong{font-size:18px;font-weight:600;line-height:1.25}
.mega-item span:last-child{font-size:14px;color:var(--muted)}
.mega-help{padding:18px 22px;background:var(--pale);border-left:3px solid var(--green);display:flex;flex-direction:column;gap:10px;font-size:15px}
.mega-help .mono{color:var(--green)!important}
.mega-help a{margin-top:auto;font-weight:500}
.mobile-menu{display:none}
@media (max-width:960px){
.nav,.head-tel{display:none}
.menu-toggle{display:flex}
.head-right .btn{display:none}
.site-header .w{height:64px}
.mega{top:64px}
.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(--green)}
.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(--pale);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(--ink);color:var(--ink)}
}

/* Home */
.hero{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(280px,1fr);gap:64px;align-items:center;padding-top:96px;padding-bottom:88px}
.hero h1{font-size:clamp(42px,5vw,68px);font-weight:700}
.hero h1 em{font-style:normal;color:var(--green);font-weight:600}
.lead{font-size:19px;color:var(--muted);max-width:620px;margin:26px 0 34px}
.btns{display:flex;gap:14px;flex-wrap:wrap}
.stat{display:flex;gap:18px;align-items:center;margin-top:44px;padding-top:24px;border-top:1px solid var(--line);max-width:600px}
.stat strong{font-size:56px;font-weight:600;letter-spacing:-3px;line-height:1}
.stat strong span{color:var(--green);font-size:38px;vertical-align:top}
.stat p{font-size:14px;color:var(--muted)}
.person{background:rgba(255,255,255,.9);border-left:2px solid var(--green);padding:18px 0 20px 24px}
.person-top{display:flex;gap:18px;align-items:center;margin:16px 0 18px}
.person-top img{width:96px;height:120px;object-fit:cover;filter:saturate(.7)}
.person h2{font-size:28px;font-weight:600}
.person-top p{font-size:13px;color:var(--muted);margin-top:6px}
.person>p{font-size:14px;color:var(--muted);margin-bottom:14px}
.anchor-bar{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff}
.anchor-bar .w{display:flex;gap:8px;flex-wrap:wrap;padding-top:14px;padding-bottom:14px}
.anchor-bar a{font-size:14px;color:var(--ink);text-decoration:none;padding:8px 14px;border:1px solid var(--line);border-radius:999px}
.anchor-bar a:hover{border-color:var(--green);color:var(--green)}
.sec{padding-top:88px;padding-bottom:88px}
.pale{background:rgba(242,246,243,.94);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.head3{display:grid;grid-template-columns:1fr 2.4fr 1.6fr;gap:35px;align-items:start;margin-bottom:44px}
.head3 h2{font-size:clamp(30px,3.2vw,44px);font-weight:600}
.head3>p:last-child{font-size:15px;color:var(--muted);padding-top:6px}
.tiles{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.tile{display:flex;flex-direction:column;justify-content:space-between;min-height:280px;padding:24px;background:#fff;border:1px solid #b9c9c0;color:var(--ink);text-decoration:none}
.tile:hover{border-color:var(--green)}
.tile-top{display:flex;justify-content:space-between;align-items:flex-start}
.tile-top span{font-size:42px;font-weight:300;line-height:1;color:var(--green)}
.tile h3{font-size:20px;font-weight:600;text-transform:uppercase;letter-spacing:.2px;margin-bottom:10px}
.tile p{font-size:14px;color:var(--muted)}
.strip{background:var(--ink);color:#fff;overflow:hidden}
.strip .w{display:grid;grid-template-columns:1fr 1.15fr;gap:8%;align-items:center;padding-top:72px;padding-bottom:72px}
.strip .mono{color:#a5dfb8}
.strip h2{font-size:40px;font-weight:600;margin:16px 0 20px}
.strip p{color:#c5d8ca;max-width:440px;margin-bottom:24px}
.strip a{color:#c1e6c9;font-weight:500}
.strip figure{margin:0;background:#fff;padding:18px}
.strip figure img{width:100%;aspect-ratio:298/123;object-fit:contain}
.strip figcaption{font-size:12px;color:var(--muted);padding-top:12px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:10%;align-items:start}
.big{font-size:27px;line-height:1.35;letter-spacing:-.01em;margin:18px 0 22px}
.langs{font-size:14px;color:var(--muted)}
.langs strong{display:block;color:var(--green);font-weight:500;margin-top:4px}
.ticks div{display:flex;gap:18px;align-items:flex-start;padding:18px 0;border-top:1px solid var(--line)}
.ticks svg{flex-shrink:0;margin-top:3px}
.ticks strong{display:block;font-size:17px;margin-bottom:4px}
.ticks p{font-size:15px;color:var(--muted)}
.papers a{display:block;padding:22px 0;border-top:1px solid var(--line);color:var(--ink);text-decoration:none}
.papers a:last-child{border-bottom:1px solid var(--line)}
.papers span{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--muted);letter-spacing:.6px}
.papers h3{font-size:23px;font-weight:500;margin-top:8px}
.papers a:hover h3{color:var(--green)}
.cta-center{text-align:center;padding-top:72px;padding-bottom:88px}
.cta-center h2{font-size:clamp(30px,3.4vw,44px);font-weight:600;margin-bottom:14px}
.cta-center p{color:var(--muted);margin-bottom:30px}
.foot{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px;border-top:1px solid #9aa8a1;padding-top:44px;padding-bottom:36px;font-size:13px}
.foot div{display:flex;flex-direction:column;gap:16px;letter-spacing:.6px}
.foot div a{color:var(--ink);text-decoration:none}
.foot div a:hover{color:var(--green)}
.foot address{font-style:normal;font-size:15px;line-height:1.6}
.copy{text-align:center;font-size:12px;color:var(--muted);padding:16px 0 32px}

/* Detail pages */
.page-hero{border-bottom:1px solid var(--line)}
.page-hero .w{padding-top:28px;padding-bottom:64px}
.crumbs{display:flex;gap:10px;font-size:14px;color:var(--muted);margin-bottom:48px;flex-wrap:wrap}
.crumbs a{color:var(--muted)}
.crumbs span:last-child{color:var(--ink)}
.page-hero h1{font-size:clamp(40px,5vw,64px);font-weight:700;margin:12px 0 20px;max-width:900px}
.page-hero .lead{margin:0}
.layout{display:flex;flex-wrap:wrap;gap:64px;padding-top:64px;padding-bottom:64px}
.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:10px}
.toc a{display:block;padding:9px 0 9px 14px;border-left:2px solid var(--line);color:var(--ink);text-decoration:none;font-size:15px}
.toc a:hover{border-left-color:var(--green)}
.sib a{display:block;padding:7px 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:0 0 40px;padding:20px;background:#fff;border:1px solid var(--line)}
.content .fig img{width:100%;aspect-ratio:298/123;object-fit:contain}
.content .fig figcaption{font-size:13px;color:var(--muted);margin-top:12px}
.block{position:relative;display:grid;grid-template-columns:1fr 1.6fr;gap:48px;padding:32px 0;border-top:1px solid var(--line)}
.block::before{content:'';position:absolute;left:-20px;top:44px;width:7px;height:7px;border-radius:50%;background:var(--green)}
.block h2{font-size:28px;font-weight:600}
.block p{color:var(--muted);margin-bottom:12px}
.block>p{grid-column:2}
.block>h2{grid-row:1/3}
.source{font-size:14px;color:var(--muted);margin-top:8px}
.ask{display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-top:32px;padding:26px 30px;background:var(--pale);border-left:3px solid var(--green)}
.ask p{font-size:18px;font-weight:500}
.pager{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;padding-bottom:72px}
.pager a{display:flex;flex-direction:column;gap:6px;padding:22px 24px;border:1px solid var(--line);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)}

@media (max-width:1050px){.head3{grid-template-columns:1fr 2fr}.head3>p:last-child{grid-column:2}.tiles{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:960px){.hero-img{width:100%;opacity:.18}.hero,.two,.strip .w{grid-template-columns:1fr}.hero{gap:40px;padding-top:56px}.side{max-width:none}}
@media (max-width:680px){
.w{padding:0 20px}
.head3{display:block}.head3 h2{margin:12px 0}
.tiles,.pager,.foot{grid-template-columns:1fr}
.block{display:block}.block::before{display:none}.block h2{margin-bottom:12px}
.lines::before{background-size:900px auto;background-position:40% top}
.sec{padding-top:56px;padding-bottom:56px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}