:root{--ink:#181512;--paper:#f7f5f0;--gold:#cfaa59;--muted:#736c64;--line:#ded8cf}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans CJK SC",sans-serif;line-height:1.75}.top{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 1120px)/2));position:sticky;top:0;background:rgba(247,245,240,.94);backdrop-filter:blur(14px);z-index:10;border-bottom:1px solid var(--line)}.brand{text-decoration:none;color:var(--ink);display:flex;gap:12px;align-items:baseline;font-family:Georgia,serif;letter-spacing:.06em}.brand i{color:var(--gold);font-size:14px}.lang{border:1px solid var(--line);border-radius:24px;padding:3px}.lang button{border:0;background:transparent;padding:7px 12px;border-radius:20px;color:var(--muted)}.lang button.active{background:var(--ink);color:#fff}main>section{max-width:1120px;margin:auto;padding:86px 24px}.hero{min-height:74vh;display:flex;flex-direction:column;justify-content:center;background:radial-gradient(circle at 85% 20%,#ead6a955,transparent 34%)}.eyebrow{color:var(--gold);letter-spacing:.12em;font-weight:600}.hero h1{font-family:Georgia,"Songti SC",serif;font-size:clamp(44px,8vw,94px);line-height:1.08;margin:.25em 0}.lead{max-width:650px;font-size:clamp(18px,2.2vw,25px);color:var(--muted)}.primary,.contact a{display:inline-block;align-self:flex-start;background:var(--ink);color:white;padding:14px 24px;border-radius:2px;text-decoration:none;margin-top:18px}.intro{border-top:1px solid var(--line)}h2{font-family:Georgia,"Songti SC",serif;font-size:clamp(32px,5vw,55px);line-height:1.2;margin:0 0 20px}.intro>p{max-width:800px;font-size:20px}.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:44px}.facts article{background:var(--paper);padding:28px}.facts strong,.facts span{display:block}.facts strong{color:var(--gold);font-size:19px;margin-bottom:10px}.section-head{display:flex;gap:24px;align-items:flex-start;margin-bottom:40px}.section-head>span{color:var(--gold);font-family:Georgia;font-size:20px}.section-head h2{margin:0}.section-head p{margin:6px 0;color:var(--muted)}.split{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}.split img{width:100%;max-height:720px;object-fit:contain;background:white}.split h3{font-size:23px;margin-top:28px}.dark{max-width:none!important;background:#151311;color:#f7f5f0;padding-left:max(24px,calc((100vw - 1120px)/2))!important;padding-right:max(24px,calc((100vw - 1120px)/2))!important}.dark .section-head p,.dark .fine{color:#bdb6ad}.gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.gallery figure{margin:0;background:#24211e}.gallery img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block}.gallery figcaption{padding:15px 18px;color:#dec689}.fine{font-size:14px}.videos{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}.video-card{background:#fff;border:1px solid var(--line);padding:10px}.video-card video{display:block;width:100%;max-height:640px;background:#111}.video-card p{margin:8px 8px 2px;color:var(--muted)}.qa details{border-top:1px solid var(--line);padding:20px 0}.qa details:last-child{border-bottom:1px solid var(--line)}summary{font-size:20px;font-weight:600;cursor:pointer}.qa details p{color:var(--muted);max-width:760px}.contact{text-align:center;background:#e8d9b7}.contact small{letter-spacing:.16em}.contact h2{max-width:720px;margin:20px auto}.contact a{align-self:auto}footer{text-align:center;padding:28px;color:var(--muted);font-size:13px}@media(max-width:720px){.top{height:62px}.brand i{display:none}main>section{padding:60px 18px}.hero{min-height:67vh}.facts,.split,.gallery,.videos{grid-template-columns:1fr}.facts article{padding:22px}.split{gap:22px}.gallery{gap:12px}.videos{gap:16px}.section-head{gap:14px}.video-card{padding:6px}}

.material-compare{background:#eee7d8}.compare-videos .video-card{border-color:#d1b879}.compare-videos .video-card p{font-size:20px;font-weight:700;color:var(--ink)}
.full-copy{border-top:1px solid var(--line)}.full-copy.alt{background:#efeae0}.copy-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:start}.copy-grid.image-left{grid-template-columns:.85fr 1.15fr}.copy-grid img{width:100%;max-height:760px;object-fit:contain}.copy-text h3,.compare-copy h3{font-size:24px;margin:0 0 12px}.copy-text p,.copy-text li,.compare-copy p{font-size:17px;color:#4f4943}.copy-text.wide{max-width:900px}.compare-copy{display:grid;grid-template-columns:1fr 1fr;gap:24px}.compare-copy article{background:#fff;padding:28px;border-top:4px solid var(--gold)}.capacity{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.capacity article{background:white;padding:12px}.capacity b{display:block;padding:8px 4px 14px;color:#9f7829}.capacity img{width:100%;aspect-ratio:4/3;object-fit:cover}@media(max-width:720px){.copy-grid,.copy-grid.image-left,.compare-copy,.capacity{grid-template-columns:1fr}.copy-text p,.copy-text li,.compare-copy p{font-size:16px}.capacity{gap:12px}}

.material-insight{margin-top:48px;padding:clamp(20px,4vw,42px);background:#f8f6ef;border:1px solid #e3ddce;border-radius:20px;box-shadow:0 10px 30px #3e352015}
.material-insight-heading{text-align:center;margin:0 auto 28px}
.material-kicker{display:inline-block;color:#56766b;font-size:13px;font-weight:700;letter-spacing:.18em;text-transform:uppercase}
.material-insight-heading h3{margin:8px 0;font-family:Georgia,"Songti SC",serif;font-size:clamp(29px,4vw,44px);line-height:1.2}
.material-insight-heading>p{margin:0;color:var(--muted)}
.insight-table-head,.insight-row{display:grid;grid-template-columns:1.1fr 1fr 1.15fr;gap:0 18px}
.insight-table-head{margin-bottom:8px}
.insight-table-head>span{padding:10px 16px;background:#365e54;color:#fff;text-align:center;font-weight:700}
.insight-table-head>span:first-child{border-radius:11px 0 0 11px}
.insight-table-head>span:last-child{border-radius:0 11px 11px 0}
.insight-row{margin-bottom:10px;padding:20px 16px;background:#fffefa;border:1px solid #e8e2d6;border-radius:14px;align-items:center}
.insight-row-featured{background:#fff8e8;border:2px solid #c2a15b;box-shadow:0 5px 18px #9b7a351a}
.insight-material,.insight-mechanism,.insight-caution{min-width:0;padding:5px 12px}
.insight-mechanism,.insight-caution{border-left:1px solid #ddd6c8}
.exclusive-tag,.material-kind{display:inline-block;margin-bottom:8px;color:#45675b;font-size:12px;font-weight:700;letter-spacing:.04em}
.exclusive-tag{padding:4px 9px;background:#e5efe8;border:1px solid #b4cbba;border-radius:20px;color:#315d4b}
.insight-material h4{margin:0 0 6px;font-family:Georgia,"Songti SC",serif;font-size:19px;line-height:1.45}
.insight-material .multiline-heading{white-space:pre-line}
.insight-material p,.insight-mechanism p,.insight-caution p{margin:0;color:#58554e;font-size:14px;line-height:1.75}
.insight-material .insight-ratio{margin:8px 0;color:#896723;font-weight:800;font-size:16px}
.material-illustration{display:block;width:min(100%,150px);height:84px;margin:0 auto 5px}
.insight-mechanism>p{text-align:center;font-size:13px;color:#706b62}
.insight-caution p{position:relative;padding-left:24px}
.insight-caution p+p{margin-top:10px}
.insight-caution p::before{position:absolute;left:0;top:1px;display:grid;width:16px;height:16px;place-items:center;border-radius:50%;font-size:11px;font-weight:800;line-height:1}
.insight-point::before{content:"✓";background:#dceadf;color:#3f7155}
.insight-risk::before{content:"!";background:#f4e9ce;color:#936f28}
.insight-row-featured .insight-material h4{color:#315b4b}
.insight-row-featured .insight-caution p{white-space:pre-line}
.insight-disclaimer{margin:18px 4px 0;color:#716b62;font-size:13px;line-height:1.8}
.section-head + .material-insight{margin-top:0;margin-bottom:24px}
#exclusive-materials{scroll-margin-top:72px}
@media(max-width:720px){.material-insight{margin-top:34px;padding:20px 14px;border-radius:16px}.material-insight-heading{margin-bottom:20px}.insight-table-head{display:none}.insight-row,.insight-row-featured{grid-template-columns:1fr;margin-bottom:14px;padding:16px 13px}.insight-material,.insight-mechanism,.insight-caution{padding:10px 5px}.insight-mechanism,.insight-caution{border-left:0;border-top:1px solid #e4ded2}.insight-mechanism{display:flex;align-items:center;gap:14px}.material-illustration{flex:none;width:112px;height:70px;margin:0}.insight-mechanism>p{text-align:left}.insight-caution p{font-size:14px}.insight-disclaimer{font-size:12px}}

:root{--topbar-height:72px;--section-nav-height:48px}
.section-nav{position:sticky;top:var(--topbar-height);z-index:9;height:var(--section-nav-height);border-bottom:1px solid var(--line);background:rgba(247,245,240,.96);backdrop-filter:blur(14px)}
.section-nav-links{height:100%;display:flex;align-items:center;gap:4px;max-width:1120px;margin:0 auto;padding:0 24px;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:none}
.section-nav-links::-webkit-scrollbar{display:none}
.section-nav a{flex:none;padding:8px 11px;color:var(--muted);font-size:13px;line-height:1.2;text-decoration:none;white-space:nowrap;border-radius:2px;transition:color .18s ease,background-color .18s ease}
.section-nav a:hover{color:var(--ink);background:#eae4d8}
.section-nav a:focus-visible{outline:2px solid var(--gold);outline-offset:2px;color:var(--ink)}
main>section[id]{scroll-margin-top:calc(var(--topbar-height) + var(--section-nav-height) + 12px)}
#exclusive-materials{scroll-margin-top:calc(var(--topbar-height) + var(--section-nav-height) + 12px)}
main>section[id]:focus{outline:none}
@media(max-width:720px){:root{--topbar-height:62px;--section-nav-height:44px}.section-nav-links{padding:0 12px;gap:2px}.section-nav a{padding:8px 10px;font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.section-nav a{transition:none}}