@charset "UTF-8";
:root{--ink:#102e43;--muted:#4b6778;--blue:#007caa;--cyan:#06b7ce;--ice:#edf7fa;--line:#d5e5eb;--paper:#fff;--navy:#102f44;--max:1220px;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;font-size:17px;line-height:1.65}a{color:inherit;text-underline-offset:5px}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #007caa;outline-offset:5px}img,svg{max-width:100%;display:block}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-weight:500;letter-spacing:-.045em;line-height:1.08}h1{font-size:clamp(48px,5.8vw,86px);max-width:920px;margin-bottom:26px}h2{font-size:clamp(34px,4vw,54px);margin-bottom:25px}h3{font-size:27px;line-height:1.2}p{margin-bottom:22px}small,.small{font-size:13px;line-height:1.6;color:var(--muted)}.wrap{max-width:var(--max);margin:auto;width:calc(100% - 80px)}.skip{position:absolute;left:15px;top:-80px;background:white;padding:10px;z-index:99}.skip:focus{top:10px}.header{position:sticky;top:0;background:#ffffffef;backdrop-filter:blur(18px);border-bottom:1px solid var(--line);z-index:30}.header-inner{display:flex;align-items:center;gap:26px;min-height:90px}.brand{text-decoration:none;display:flex;flex-direction:column;line-height:1;gap:7px;flex-shrink:0}.brand strong{font-size:30px;letter-spacing:.15em}.brand small{font-size:9px;letter-spacing:.29em}.nav{display:flex;align-items:center;justify-content:center;gap:23px;margin-left:auto}.nav a{text-decoration:none;font-size:14px;line-height:1.2;padding:12px 0;white-space:nowrap}.nav a[aria-current=page]{color:var(--blue);border-bottom:2px solid var(--cyan)}.language{border:1px solid var(--line);border-radius:30px;padding:9px 15px;text-decoration:none;font-size:13px;white-space:nowrap}.menu{display:none;border:1px solid var(--line);background:white;padding:8px 12px;border-radius:30px}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.19em;font-weight:700;color:var(--blue);margin-bottom:22px}.lead{font-size:22px;line-height:1.6;max-width:740px;color:var(--muted)}.hero{position:relative;isolation:isolate;min-height:690px;display:flex;align-items:center;background:#f3f9fb;overflow:hidden}.hero-image{position:absolute;right:0;top:0;width:79%;height:100%;object-fit:cover;z-index:-2}.hero:after{content:'';position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,#f5fafc 2%,#f5fafcf5 27%,#f5fafc66 51%,transparent 67%)}.hero-copy{max-width:560px;padding:75px 0 90px}.hero .lead{font-size:20px;max-width:440px}.hero h1{font-size:clamp(52px,6vw,86px)}.hero-caption{position:absolute;bottom:12px;right:32px;font-size:11px;color:#466377;background:#ffffffd9;padding:4px 10px;border-radius:5px;max-width:42%}.actions{display:flex;gap:16px;flex-wrap:wrap;align-items:center;margin-top:30px}.button{background:var(--ink);color:white;border:1px solid var(--ink);border-radius:5px;padding:14px 22px;text-decoration:none;display:inline-flex;align-items:center;gap:18px;font-size:15px;font-weight:600;line-height:1.5}.button:hover{background:#006b90;border-color:#006b90}.button.light{background:white;color:var(--ink);border-color:var(--line)}.text-link{color:var(--blue);font-size:15px;font-weight:700}.section{padding:90px 0;border-bottom:1px solid var(--line)}.section.ice{background:var(--ice)}.section.dark{background:var(--navy);color:white}.section.dark p{color:#d1e5ed}.section.dark .eyebrow{color:#84e4f4}.split{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:start}.split>*,.grid>*,.article-grid>*{min-width:0}.intro{padding:78px 0 65px;background:linear-gradient(130deg,#fff,#e8f6fb);border-bottom:1px solid var(--line)}.intro h1{max-width:960px}.breadcrumb{font-size:13px;margin-bottom:35px;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}.tile{padding:30px 0;border-top:2px solid #b4dce7}.tile .num{display:block;font-size:13px;color:var(--blue);font-weight:700;letter-spacing:.1em;margin-bottom:25px}.tile p{color:var(--muted);font-size:16px}.statement{font-size:clamp(27px,3vw,42px);line-height:1.3;letter-spacing:-.035em;max-width:970px}.article-grid{display:grid;grid-template-columns:230px 1fr;gap:70px}.toc{position:sticky;top:125px;align-self:start}.toc p{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--blue);font-weight:bold}.toc a{display:block;text-decoration:none;font-size:14px;color:var(--muted);padding:10px 0;border-bottom:1px solid var(--line)}.chapter{padding:0 0 65px;margin-bottom:60px;border-bottom:1px solid var(--line);scroll-margin-top:120px}.chapter:last-child{border:0;margin-bottom:0;padding-bottom:0}.chapter h2{font-size:clamp(33px,3.2vw,46px)}.chapter .body{max-width:800px}.diagram{background:var(--ice);padding:30px;border-radius:10px;margin:28px 0}.diagram svg{width:100%;max-height:280px}.diagram figcaption{font-size:13px;color:var(--muted);margin-top:20px}.flow{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:30px 0}.flow>div{padding:23px;background:var(--ice);border-top:3px solid var(--cyan);font-size:15px}.flow strong{display:block;margin-bottom:10px;font-size:18px;line-height:1.25}.note{border-left:3px solid var(--cyan);padding:22px 27px;background:#f3f9fb;margin:28px 0}.note p:last-child{margin-bottom:0}.note h3{font-size:22px}.source{font-size:13px;margin:22px 0;color:var(--muted);overflow-wrap:anywhere}.source a{color:#006e91}.study{background:white;border:1px solid var(--line);padding:32px;margin:30px 0;border-radius:8px}.study h3{font-size:25px}.study dl{margin:0}.study dt{font-size:12px;text-transform:uppercase;letter-spacing:.1em;font-weight:bold;color:var(--blue);margin:20px 0 8px}.study dd{margin:0;font-size:16px}.metric{font-size:54px;line-height:1.1;letter-spacing:-.05em;color:var(--blue);display:block;margin:20px 0 12px}.mineral-symbols{display:flex;gap:18px;align-items:center;justify-content:center;min-height:260px;background:radial-gradient(ellipse,#d1f3f7,transparent 70%);margin:30px 0}.mineral-symbols span{width:120px;height:120px;border:1px solid #9ccddd;border-radius:50%;display:grid;place-content:center;background:linear-gradient(140deg,#fff,#d9f0f6);box-shadow:8px 15px 25px #1e77841a;font-size:40px;color:#087a9f}.mineral-symbols span:nth-child(2){transform:translateY(-25px)}.calculator{background:var(--navy);color:white;padding:35px;border-radius:10px}.calculator h3{color:white}.calculator p{color:#d6e9ef}.fields{display:grid;grid-template-columns:1fr 1fr;gap:20px}.fields label{font-size:14px;display:block}.fields input,.brief input,.brief textarea,.brief select{display:block;width:100%;padding:12px;margin-top:8px;border:1px solid #98bac7;border-radius:4px;background:white;color:var(--ink)}.calculator output{font-size:46px;display:block;margin:25px 0 5px;line-height:1.2}.calculator .small{color:#c9e4ed}.brief{padding:35px;background:var(--ice);border-radius:10px}.brief label{display:block;font-size:15px;margin-bottom:20px}.brief textarea{min-height:110px}.brief .status{font-size:14px;margin-top:18px}.region{border-left:3px solid var(--cyan);padding-left:25px}.region h3{margin-bottom:12px}.status-label{font-size:12px;letter-spacing:.09em;text-transform:uppercase;color:var(--blue);font-weight:bold}.footer{padding:60px 0 28px;background:#f1f7f9}.footer-top{display:flex;justify-content:space-between;align-items:start;gap:35px}.footer-links{display:flex;gap:24px;flex-wrap:wrap;font-size:14px}.footer-bottom{margin-top:45px;padding-top:22px;border-top:1px solid var(--line);font-size:12px;color:var(--muted);display:flex;justify-content:space-between;gap:30px}.footer-bottom p{max-width:740px}.wide-art{width:100%;max-height:390px;object-fit:cover;border-radius:8px}.pill-row{display:flex;gap:12px;flex-wrap:wrap}.pill{font-size:13px;padding:8px 14px;border:1px solid var(--line);border-radius:30px;background:white}.faq details{border-top:1px solid var(--line);padding:24px 0}.faq summary{cursor:pointer;font-size:21px;line-height:1.35;font-weight:500}.faq details p{padding-top:20px;margin-bottom:0;font-size:16px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:1100px){.header-inner{gap:15px}.nav{gap:15px}.nav a{font-size:12px}.wrap{width:calc(100% - 50px)}.split{gap:40px}.article-grid{grid-template-columns:180px 1fr;gap:40px}.hero-copy{max-width:510px}.hero-image{width:85%}}
@media(max-width:850px){html{scroll-padding-top:90px}.header-inner{min-height:75px}.brand strong{font-size:25px}.brand small{font-size:8px}.language{margin-left:auto}.menu{display:block}.nav{display:none;position:absolute;top:100%;left:0;right:0;padding:20px 26px;background:white;border-bottom:1px solid var(--line);box-shadow:0 20px 25px #122c4312;margin:0}.nav.open{display:grid;gap:0}.nav a{font-size:17px;padding:15px 0}.hero{min-height:770px;align-items:start}.hero-copy{padding:55px 0 320px;max-width:580px}.hero-image{width:100%;height:440px;top:auto;bottom:0;object-position:65% center}.hero:after{background:linear-gradient(180deg,#f5fafc 1%,#f5fafc 37%,transparent 70%)}.hero h1{font-size:63px}.hero-caption{max-width:85%;right:20px;font-size:10px}.hero .lead{max-width:500px}.section{padding:60px 0}.split{grid-template-columns:1fr;gap:30px}.grid{grid-template-columns:1fr}.tile{padding:23px 0}.article-grid{display:block}.toc{position:static;display:flex;gap:13px;overflow-x:auto;margin-bottom:40px;padding-bottom:12px}.toc p{display:none}.toc a{flex-shrink:0;max-width:220px;border:1px solid var(--line);border-radius:30px;padding:9px 16px}.intro{padding:50px 0}.intro h1{font-size:53px}.lead{font-size:20px}.footer-top{flex-direction:column}.flow{grid-template-columns:1fr}.chapter{padding-bottom:45px;margin-bottom:45px}.footer-bottom{flex-direction:column;gap:0}}
@media(max-width:480px){body{font-size:16px}.wrap{width:calc(100% - 36px)}.hero h1{font-size:48px}.hero-copy{padding-top:45px}.hero .lead{font-size:18px}.hero{min-height:780px}.hero-image{height:380px}.hero:after{background:linear-gradient(180deg,#f5fafc 1%,#f5fafc 44%,transparent 75%)}.intro h1{font-size:43px}.header-inner{gap:10px}.language{padding:7px 10px;font-size:12px}.menu{padding:7px 10px;font-size:13px}.brand strong{font-size:22px}.brand small{font-size:7px}.study,.brief,.calculator{padding:24px}.diagram{padding:16px;margin:24px 0}.note{padding:20px}.fields{grid-template-columns:1fr}.mineral-symbols span{width:84px;height:84px;font-size:30px}.mineral-symbols{min-height:210px;gap:12px}.footer-links{gap:18px}.actions{gap:20px}.button{padding:13px 18px}}
.chapter{scroll-margin-top:20px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}