:root{--bg:#f6f6f3;--ink:#111;--muted:#6f716f;--line:#d9dad6;--dark:#161716;--accent:#d6ff42;--paper:#fff}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,"Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}button,input,select{font:inherit}.container{width:min(1160px,92%);margin:auto}
.site-header{height:76px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(246,246,243,.94);backdrop-filter:blur(14px);z-index:50}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:12px}.brand-mark{width:38px;height:38px;background:var(--dark);color:var(--accent);display:grid;place-items:center;font-weight:700;font-size:10px}.brand-copy strong{display:block;font-size:15px}.brand-copy span{font-size:9px;letter-spacing:1.7px;color:#8b8d88}.nav{display:flex;gap:25px;align-items:center}.nav a{font-size:10px;color:#666962}.nav a.active{color:#000}.nav-cta{background:#111!important;color:#fff!important;padding:10px 14px}.mobile-nav{display:none}
.hero{padding:85px 0 65px;border-bottom:1px solid var(--line)}.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:end}.eyebrow,.section-kicker{font-size:9px;letter-spacing:2px;color:#7d8079}.hero h1{font-size:66px;line-height:.98;letter-spacing:-3px;margin:18px 0 0;font-weight:700}.hero p{font-size:12px;line-height:1.9;color:#72756f;max-width:620px;margin-top:22px}.scale{height:210px;background:#111;color:#fff;padding:24px;position:relative;overflow:hidden}.scale:before{content:"";position:absolute;left:0;right:0;bottom:38px;height:58px;background:repeating-linear-gradient(90deg,transparent 0 23px,#6f7468 24px 25px)}.scale:after{content:"01  02  03  04  05  06  07  08";position:absolute;left:24px;bottom:15px;letter-spacing:14px;font-size:9px;color:#747a6d}.scale b{font-size:12px;color:var(--accent)}.scale strong{display:block;font-size:42px;margin-top:20px}
.hero-actions{display:flex;gap:9px;margin-top:27px}.btn{border:1px solid #d3d5d0;background:#fff;padding:11px 15px;font-size:10px;cursor:pointer;display:inline-flex;justify-content:center}.btn.primary{background:#111;color:#fff;border-color:#111}
.section{padding:90px 0}.section-head{display:grid;grid-template-columns:.6fr 1.4fr;gap:55px;margin-bottom:40px}.section-head h2{font-size:36px;letter-spacing:-1.4px;margin:0}.section-head p{font-size:10px;line-height:1.9;color:#757872}.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.card{border-top:2px solid #111;padding-top:15px}.card .n{font-size:9px;color:#8d9089}.card h3{font-size:14px;margin-top:25px}.card p{font-size:10px;color:#70736d;line-height:1.9}
.page-hero{padding:56px 0 38px;background:#fff;border-bottom:1px solid var(--line)}.page-hero h1{font-size:44px;letter-spacing:-1.8px;margin:10px 0 0}.page-hero p{font-size:11px;color:#71746f;line-height:1.9;max-width:700px}
.tool-wrap{padding:36px 0 86px}.tool-panel{background:#fff;border:1px solid #d9dad6;padding:28px}.tabs{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:24px}.tab{border:1px solid #d8dad5;background:#f8f8f5;padding:9px 13px;font-size:10px;cursor:pointer}.tab.active{background:#111;color:#fff;border-color:#111}.convert{display:grid;grid-template-columns:1fr 70px 1fr;gap:18px;align-items:end}.field label{display:block;font-size:9px;color:#777b74;margin-bottom:7px}.field input,.field select{width:100%;height:48px;border:1px solid #d8dad5;background:#fafaf8;padding:0 12px;outline:0}.swap{height:48px;border:1px solid #d8dad5;background:#f4f4f0;font-size:18px;cursor:pointer}.result{margin-top:24px;background:#111;color:#fff;padding:22px;display:flex;align-items:center;justify-content:space-between}.result small{font-size:9px;color:#8d928a;display:block}.result strong{font-size:28px}.result .btn{border-color:#343434;background:#1b1b1b;color:#fff}
.info-layout{display:grid;grid-template-columns:.75fr 1.25fr;gap:50px}.info-nav{position:sticky;top:100px;align-self:start;border-left:2px solid #111}.info-nav a{display:block;padding:8px 13px;font-size:10px;color:#777b74}.prose{background:#fff;border:1px solid #d9dad6;padding:28px}.prose h2{font-size:25px;margin:0 0 12px}.prose h3{font-size:14px;margin:28px 0 9px}.prose p,.prose li{font-size:10px;line-height:2;color:#70736d}.prose ul{padding-left:18px}.info-table{border-top:1px solid var(--line);margin-top:18px}.info-row{display:grid;grid-template-columns:140px 1fr;padding:13px 0;border-bottom:1px solid var(--line);font-size:10px}.info-row span:first-child{color:#888b85}
.site-footer{background:#111;color:#787c74;padding:30px 0 42px}.footer-inner{display:flex;justify-content:space-between}.footer-title{color:#ddd;font-size:11px}.footer-copy,.footer-meta{font-size:9px;line-height:1.9}.footer-meta{text-align:right}.notfound{min-height:100vh;display:grid;place-items:center;text-align:center}.code{font-size:100px;font-weight:700;color:#d6d7d2}
@media(max-width:850px){.nav{display:none}.mobile-nav{display:block;font-size:10px}.hero-grid,.section-head,.info-layout{grid-template-columns:1fr}.hero h1{font-size:45px}.cards{grid-template-columns:1fr 1fr}.convert{grid-template-columns:1fr}.info-nav{display:none}}