:root{--ink:#253039;--muted:#687680;--paper:#fdfbf7;--copper:#b86132;--copper2:#d98755;--oxide:#327c72;--blue:#365f79;--gold:#d8a53d;--rock:#5d5a55;--sand:#eadcc7;--line:#dedbd4;--white:#fff;--max:1450px;--shadow:0 16px 44px rgba(37,48,57,.11)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;line-height:1.67}a{color:#256b71;text-underline-offset:.18em}a:hover{color:#9d4a28}.wrap{width:min(var(--max),calc(100% - 36px));margin:auto}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:10px;background:#fff;padding:10px;z-index:100}
header{position:sticky;top:0;z-index:50;background:rgba(253,251,247,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.top{min-height:78px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-weight:900;letter-spacing:-.025em}.mark{width:46px;height:46px;border-radius:12px;background:linear-gradient(145deg,#6c4b3c,#b86132);position:relative;overflow:hidden}.mark:before{content:"Cu";position:absolute;inset:0;display:grid;place-items:center;color:#fff;font-weight:950;font-size:1.15rem}.mark:after{content:"29";position:absolute;right:4px;top:2px;font-size:.5rem;color:#f5d3bf;font-weight:800}
nav ul{display:flex;gap:15px;list-style:none;margin:0;padding:0;flex-wrap:wrap}nav a{text-decoration:none;color:var(--ink);font-size:.9rem;font-weight:770}.menu{display:none;border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px 11px;font-weight:800}
.hero{background:linear-gradient(125deg,#eef5f2 0,#fff3e5 50%,#eee9df 100%);border-bottom:1px solid var(--line);overflow:hidden}.heroGrid{display:grid;grid-template-columns:1.02fr .98fr;gap:54px;align-items:center;padding:72px 0}.eyebrow{font-size:.75rem;letter-spacing:.14em;text-transform:uppercase;font-weight:900;color:var(--copper)}h1,h2,h3{line-height:1.14;letter-spacing:-.028em}h1{font-size:clamp(2.5rem,6vw,5rem);margin:.23em 0 .29em}.hero p,.pageHero p{font-size:1.13rem;color:#5e6d75;max-width:900px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 18px;border-radius:999px;border:1px solid #b8b6ae;background:#fff;color:var(--ink);font-weight:850;text-decoration:none}.primary{background:#315f68;border-color:#315f68;color:#fff}
.mineScene{height:420px;position:relative;border-radius:22px;overflow:hidden;border:1px solid #cfc8bb;background:linear-gradient(#a8d7dc 0 37%,#cfa574 37% 48%,#8f6c4d 48% 63%,#67503d 63%);box-shadow:var(--shadow)}.sun{position:absolute;width:64px;height:64px;border-radius:50%;background:#edbd50;right:48px;top:34px}.bench{position:absolute;left:0;right:0;height:45px;background:#76543f;clip-path:polygon(0 30%,32% 30%,38% 0,68% 0,73% 40%,100% 40%,100% 100%,0 100%)}.be1{bottom:82px}.be2{bottom:38px;background:#5f493b;transform:scaleX(.9);transform-origin:right}.plant{position:absolute;right:45px;bottom:110px;width:165px;height:105px;background:#e6e1d6;border:4px solid #5c6870}.plant:before{content:"";position:absolute;left:15px;bottom:0;width:20px;height:150px;background:#7c6e62;box-shadow:50px 35px 0 #b86132,95px 5px 0 #677b83}.plant:after{content:"";position:absolute;left:-42px;top:35px;width:85px;height:10px;background:#344e59;transform:rotate(-18deg);transform-origin:right}.truck{position:absolute;left:70px;bottom:122px;width:105px;height:42px;background:#d8a53d;border-radius:6px 15px 5px 5px}.truck:before{content:"";position:absolute;width:33px;height:26px;background:#b86132;right:-22px;bottom:0;clip-path:polygon(0 0,75% 0,100% 100%,0 100%)}.truck:after{content:"";position:absolute;width:22px;height:22px;border-radius:50%;background:#2e353a;left:16px;bottom:-14px;box-shadow:63px 0 0 #2e353a}.wire{position:absolute;left:235px;top:58px;width:4px;height:180px;background:#344e59}.wire:before{content:"";position:absolute;width:95px;height:4px;background:#344e59;left:-45px;top:22px;box-shadow:0 22px 0 #344e59}.ore{position:absolute;width:54px;height:45px;background:linear-gradient(135deg,#8f6547,#ba6b3d 55%,#2f8176 57% 66%,#79543d 68%);left:228px;bottom:42px;clip-path:polygon(50% 0,88% 24%,100% 70%,75% 100%,22% 92%,0 55%,15% 16%)}
.section{padding:62px 0}.soft{background:#edf5f2}.warm{background:#f8eee1}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.card{background:#fff;border:1px solid var(--line);border-radius:15px;padding:23px;box-shadow:0 8px 24px rgba(37,48,57,.055)}.card h3{margin-top:0}.kicker{font-size:.74rem;text-transform:uppercase;letter-spacing:.11em;color:var(--copper);font-weight:900}.pageHero{background:linear-gradient(120deg,#eaf4f1,#fff0df);border-bottom:1px solid var(--line);padding:52px 0 43px}.pageHero h1{font-size:clamp(2.15rem,5vw,4rem);max-width:1120px}.breadcrumbs{padding-top:15px;font-size:.9rem;color:var(--muted)}.breadcrumbs a{color:var(--muted)}.content{max-width:950px}.content p{font-size:1.045rem}.note{margin:26px 0;padding:18px 20px;border-left:5px solid var(--gold);background:#fff8e5;border-radius:0 12px 12px 0}.warning{border-left-color:var(--copper);background:#fff1e9}.related{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.related a{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px;text-decoration:none;font-weight:800}.tool{max-width:900px;background:#fff;border:1px solid #d4d5d0;border-radius:17px;padding:26px;box-shadow:var(--shadow)}.formgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.field{display:flex;flex-direction:column;gap:6px}.field label{font-weight:800}.field input,.field select{padding:11px 12px;border:1px solid #a9b1b3;border-radius:8px;font:inherit}.result{margin-top:17px;padding:17px;background:#ecf7f3;border:1px solid #c9dfd8;border-radius:10px}.result strong{font-size:1.35rem;color:#256b67}
footer{background:#2d3d43;color:#dfe7e8;margin-top:60px}.foot{display:grid;grid-template-columns:1.05fr 1.95fr;gap:40px;padding:46px 0}.footlinks{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px 18px}.footlinks a{color:#f2f7f7;text-decoration:none}.fine{border-top:1px solid #516169;padding:17px 0 26px;color:#b0bec3;font-size:.89rem}.cookie{background:none;border:0;padding:0;color:inherit;text-decoration:underline;font:inherit;cursor:pointer}
@media(max-width:1040px){nav{display:none}.menu{display:block}nav.open{display:block;position:absolute;top:78px;left:0;right:0;background:#fdfbf7;border-bottom:1px solid var(--line);padding:17px}nav.open ul{width:min(var(--max),calc(100% - 36px));margin:auto;display:grid;grid-template-columns:repeat(2,1fr)}.heroGrid{grid-template-columns:1fr}.mineScene{max-width:720px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.related{grid-template-columns:repeat(2,minmax(0,1fr))}.foot{grid-template-columns:1fr}}
@media(max-width:640px){.wrap{width:min(var(--max),calc(100% - 24px))}.grid,.grid2,.formgrid,.related{grid-template-columns:1fr}.footlinks{grid-template-columns:repeat(2,1fr)}.mineScene{height:340px}.section{padding:45px 0}}