:root{--bg:#f8f6f1;--card:#fff;--ink:#16140f;--muted:#6b665e;--line:#e4dfd5;--acc:#b2542c;--acc-soft:#f3e6de;--ok:#2e7d50;
--font:"Inter","Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.7 var(--font)}
a{color:var(--acc);text-underline-offset:3px}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.top{position:sticky;top:0;z-index:5;background:rgba(248,246,241,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink);text-decoration:none;letter-spacing:.02em;white-space:nowrap}
.brand-sub{font-weight:500;color:var(--muted)}
.mark{display:grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--ink);color:var(--bg);font-size:15px}
nav{display:flex;align-items:center;gap:18px;font-size:15px}
nav a{color:var(--ink);text-decoration:none;white-space:nowrap}
nav a:hover{color:var(--acc)}
.lang{border:1px solid var(--line);padding:4px 10px;border-radius:99px}
.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--acc);color:#fff!important;text-decoration:none;font-weight:700;padding:12px 22px;border-radius:12px;white-space:nowrap}
.btn:hover{filter:brightness(1.07)}
.btn.sm{padding:7px 14px;border-radius:9px;font-size:14px}
.hero{padding:72px 0 40px}
.eyebrow{color:var(--acc);font-weight:600;font-size:14px;letter-spacing:.04em;margin:0 0 12px}
.hero h1{font-size:clamp(36px,6vw,64px);line-height:1.08;letter-spacing:-.025em;margin:0 0 18px;font-weight:800}
.lede{font-size:19px;color:var(--muted);max-width:720px}
.codebox{display:flex;align-items:center;gap:14px;flex-wrap:wrap;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 18px;margin:26px 0;max-width:640px}
.codebox>div{display:flex;flex-direction:column;margin-right:auto}
.label{font-size:13px;color:var(--muted)}
.code{font-size:30px;font-weight:800;letter-spacing:.06em;line-height:1.1}
.copy{font:inherit;font-size:14px;font-weight:600;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 16px;cursor:pointer;color:var(--ink)}
.facts{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:10px}
.fact{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.fact b{display:block;font-size:28px;line-height:1.2}
.fact span{font-size:14px;color:var(--muted)}
section{margin-bottom:56px}
h2{font-size:28px;line-height:1.25;letter-spacing:-.01em;margin:48px 0 16px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;text-decoration:none;color:var(--ink);transition:border-color .15s,transform .15s}
.card:hover{border-color:var(--acc);transform:translateY(-2px)}
.card b{font-size:19px;line-height:1.35}
.cat{font-size:13px;color:var(--acc);font-weight:600}
.small{font-size:14px;color:var(--muted);line-height:1.6}
.more{font-weight:600}
.calc{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;margin:20px 0}
.calc-in{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.calc label{display:flex;flex-direction:column;font-size:14px;color:var(--muted);gap:6px}
.calc input,.calc select{font:inherit;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px;width:100%}
.calc-out{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0 8px}
.calc-out div{background:var(--bg);border-radius:12px;padding:14px}
.calc-out span{display:block;font-size:13px;color:var(--muted)}
.calc-out b{font-size:24px}
.calc-out .hi{background:var(--acc-soft)}
.calc-out .hi b{color:var(--acc)}
.checks{list-style:none;padding:0;margin:0;display:grid;gap:10px;max-width:760px}
.checks li{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 16px 12px 44px;position:relative}
.checks li:before{content:"";position:absolute;left:16px;top:20px;width:14px;height:8px;border-left:3px solid var(--ok);border-bottom:3px solid var(--ok);transform:rotate(-45deg)}
.article{max-width:780px;padding-top:36px;padding-bottom:40px}
.article h1,.page-h{font-size:clamp(32px,5vw,46px);line-height:1.12;letter-spacing:-.02em;margin:10px 0 10px}
.page-h{margin-top:36px}
.crumbs{font-size:14px;color:var(--muted)}
.crumbs a{color:var(--muted)}
.meta{font-size:14px;color:var(--muted);margin:0 0 18px}
.article ul,.article ol{padding-left:22px}
.article li{margin:6px 0}
.steps{counter-reset:s;list-style:none;padding:0!important}
.steps li{counter-increment:s;position:relative;padding-left:46px;margin:14px 0}
.steps li:before{content:counter(s);position:absolute;left:0;top:2px;width:30px;height:30px;border-radius:50%;background:var(--acc);color:#fff;display:grid;place-items:center;font-weight:700;font-size:15px}
.tbl{overflow-x:auto;margin:16px 0;border:1px solid var(--line);border-radius:14px;background:var(--card)}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
th{color:var(--muted);font-weight:600;font-size:13px}
tr:last-child td{border-bottom:0}
figure{margin:22px 0}
figure img{border-radius:12px;border:1px solid var(--line)}
figcaption{font-size:14px;color:var(--muted);margin-top:8px}
.note{background:var(--acc-soft);border-radius:12px;padding:14px 18px;margin:20px 0;font-size:16px}
details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin:10px 0}
summary{cursor:pointer;font-weight:600}
details p{margin:10px 0 2px;color:var(--muted)}
.foot{border-top:1px solid var(--line);padding:32px 0 40px;margin-top:40px}
.foot-row{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-bottom:14px}
.foot-links{display:flex;gap:18px;flex-wrap:wrap;font-size:15px}
.foot-links a{color:var(--ink);text-decoration:none}
@media (max-width:860px){.grid{grid-template-columns:1fr 1fr}.facts{grid-template-columns:1fr 1fr}}
@media (max-width:620px){body{font-size:16px}.wrap{padding:0 16px}nav a:not(.btn):not(.lang){display:none}.brand-sub{display:none}
.grid,.calc-in,.calc-out{grid-template-columns:1fr}.hero{padding:44px 0 24px}.codebox .btn{width:100%}h2{font-size:24px}}