:root{--bg:#141e29;--line:#26364a;--ink:#c9d4df;--dim:#7d91a6;--accent:#ffffff;--paper:#192533;--ok:#7ed4a6;--mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;--cond:"Barlow Condensed","Arial Narrow",sans-serif}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--mono);font-size:14.5px;line-height:1.75;color:var(--ink);background-color:var(--bg);background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px),linear-gradient(rgba(38,54,74,.28) 1px,transparent 1px),linear-gradient(90deg,rgba(38,54,74,.28) 1px,transparent 1px);background-size:120px 120px,120px 120px,24px 24px,24px 24px;-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:var(--cond);font-weight:600;text-transform:uppercase;letter-spacing:1.5px;line-height:1.05;color:var(--ink)}
a{color:var(--accent)}
.sheet{max-width:1200px;margin:24px auto;border:1.5px solid var(--dim);position:relative;min-height:calc(100vh - 48px)}
.sheet::before{content:"";position:absolute;inset:8px;border:1px solid var(--line);pointer-events:none;z-index:1}
@media(max-width:600px){.sheet{margin:10px;min-height:calc(100vh - 20px)}}
nav{position:sticky;top:0;z-index:20;background:rgba(22,34,47,.92);border-bottom:1px solid var(--line);backdrop-filter:blur(4px)}
.nav-inner{max-width:1140px;margin:0 auto;padding:0 20px;height:72px;display:flex;align-items:center;gap:24px}
.brand{display:inline-flex;flex-direction:column;align-items:center;gap:5px;color:var(--ink);font-family:var(--cond);font-weight:600;font-size:1.9rem;letter-spacing:2px;text-decoration:none;line-height:1}
.brand-rule{display:block;height:15px;width:auto;color:var(--ink)}
.nav-links{display:flex;align-items:center;gap:24px;margin-left:28px}
.nav-links a,.nav-login{font-family:var(--mono);font-size:12px;letter-spacing:2px;text-transform:uppercase;font-weight:500;color:var(--dim);text-decoration:none;white-space:nowrap}
.nav-links a:hover,.nav-login:hover{color:var(--accent)}
.lang-toggle{margin-left:auto;margin-right:18px;background:transparent;border:1px solid var(--dim);color:var(--dim);font-family:var(--mono);font-size:12px;letter-spacing:2px;text-transform:uppercase;font-weight:600;padding:6px 10px;cursor:pointer}
.lang-toggle:hover{color:var(--accent);border-color:var(--accent)}
/* products dropdown */
.nav-dd{position:relative}
.nav-dd>button{background:none;border:0;cursor:pointer;font-family:var(--mono);font-size:12px;letter-spacing:2px;text-transform:uppercase;font-weight:500;color:var(--dim);padding:0;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.nav-dd>button:hover,.nav-dd.open>button{color:var(--accent)}
.nav-dd>button svg{width:10px;height:10px;fill:none;stroke:currentColor;stroke-width:1.5;transition:transform .15s ease}
.nav-dd.open>button svg{transform:rotate(180deg)}
.nav-dd-menu{position:absolute;left:0;top:calc(100% + 22px);min-width:300px;background:var(--paper);border:1px solid var(--dim);box-shadow:0 14px 34px rgba(0,0,0,.4);padding:8px 0;display:none;z-index:30}
.nav-dd.open .nav-dd-menu{display:block}
@media(hover:hover){.nav-dd:hover .nav-dd-menu{display:block}.nav-dd:hover>button{color:var(--accent)}.nav-dd:hover>button svg{transform:rotate(180deg)}.nav-dd::after{content:"";position:absolute;left:0;right:0;top:100%;height:24px}}
.nav-dd-menu a{display:flex;align-items:baseline;gap:14px;padding:10px 18px;font-size:12px;letter-spacing:1px;text-transform:uppercase;color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line)}
.nav-dd-menu a:last-child{border-bottom:0}
.nav-dd-menu a:hover,.nav-dd-menu a:focus{background:var(--bg);color:var(--accent);outline:none}
.nav-dd-menu a span{color:var(--accent);font-size:10px;letter-spacing:2px;min-width:38px}
@media(max-width:560px){.nav-inner{flex-wrap:wrap;height:auto;gap:8px 10px;padding:10px 14px}.brand{order:1;font-size:1.4rem}.lang-toggle{order:2;margin-right:10px;padding:5px 7px;font-size:11px;letter-spacing:1px}.nav-login{order:3;font-size:11px;letter-spacing:1px}.nav-links{order:4;width:100%;margin:0;gap:14px;padding-top:8px;border-top:1px solid var(--line)}.nav-dd-menu{position:fixed;left:10px;right:10px;top:118px;min-width:0}}
/* product page */
main{max-width:1140px;margin:0 auto;padding:64px 20px 96px;position:relative;z-index:2}
.sheet-label{font-size:11px;letter-spacing:3px;text-transform:uppercase;color:var(--dim);margin-bottom:18px}
.sheet-label b{color:var(--accent);font-weight:500}
.back{display:inline-block;font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--dim);text-decoration:none;margin-bottom:36px}
.back:hover{color:var(--accent)}
.p-head{max-width:760px;margin-bottom:36px}
.p-head h1{font-size:clamp(2.6rem,5.4vw,4.2rem);margin-bottom:14px}
.p-head .summary{font-size:15px;line-height:1.8;color:var(--dim);max-width:640px}
.dimension{position:relative;max-width:520px;height:26px;margin:22px 0 0}
.dimension .bar{position:absolute;left:0;right:0;top:12px;border-top:1px solid var(--dim)}
.dimension .bar::before,.dimension .bar::after{content:"";position:absolute;top:-6px;height:12px;border-left:1px solid var(--dim)}
.dimension .bar::before{left:0}.dimension .bar::after{right:0}
.dimension .value{position:absolute;top:2px;left:50%;transform:translateX(-50%);background:var(--bg);padding:0 12px;font-size:10px;letter-spacing:2px;color:var(--dim);text-transform:uppercase;white-space:nowrap}
.p-grid{display:grid;gap:24px}
@media(min-width:820px){.p-grid{grid-template-columns:1fr 1fr}}
.panel{background:var(--paper);border:1px solid var(--dim);padding:28px}
.panel h2{font-size:1.5rem;margin-bottom:18px}
.panel ul{list-style:none;border-top:1px solid var(--line)}
.panel li{position:relative;padding:12px 0 12px 30px;border-bottom:1px solid var(--line);font-size:14px;line-height:1.7;color:var(--ink)}
.panel li::before{content:"";position:absolute;left:0;top:19px;width:18px;border-top:1px solid var(--accent)}
.helps{margin-top:32px;border:1px solid var(--accent);padding:20px 26px;font-size:14.5px;font-weight:500;line-height:1.7}
.p-cta{margin-top:56px;display:flex;flex-wrap:wrap;gap:16px;align-items:center}
.stamp{font-family:var(--mono);font-size:13px;letter-spacing:2px;text-transform:uppercase;font-weight:600;padding:14px 26px;border:1.5px solid var(--accent);color:var(--bg);background:var(--accent);text-decoration:none;display:inline-block;line-height:1.2;transition:transform .15s ease,box-shadow .15s ease}
.stamp.secondary{background:transparent;color:var(--accent)}
.stamp:hover{background:#dfe6ee;border-color:#dfe6ee;color:var(--bg)}
.p-nav{margin-top:64px;border-top:1px solid var(--line);padding-top:24px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.p-nav a{font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--dim);text-decoration:none}
.p-nav a:hover{color:var(--accent)}
footer{border-top:1px solid var(--line);padding:28px 0}
.foot{max-width:1140px;margin:0 auto;padding:0 20px;color:var(--dim);font-size:12px;letter-spacing:1.5px;text-transform:uppercase;display:flex;gap:14px;flex-wrap:wrap}
.foot a{color:var(--dim);text-decoration:none}
.foot a:hover{color:var(--accent)}
.foot-legal{font-size:13px;letter-spacing:.3px;text-transform:none;width:100%;margin-top:8px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.stamp:hover{transform:none}}
.p-list{list-style:none;max-width:640px;border-top:1px solid var(--line)}
.p-list li{position:relative;padding:14px 0 14px 30px;border-bottom:1px solid var(--line);font-size:15px;line-height:1.7;color:var(--ink)}
.p-list li::before{content:"";position:absolute;left:0;top:21px;width:18px;border-top:1px solid var(--accent)}
.helps{max-width:640px}
.p-steps{list-style:none;max-width:640px;position:relative;margin:8px 0 0}
.p-steps::before{content:"";position:absolute;left:19px;top:14px;bottom:14px;border-left:1px dashed var(--dim)}
.p-steps li{position:relative;display:flex;gap:22px;padding:0 0 30px}
.p-steps li:last-child{padding-bottom:0}
.p-steps .num{flex:0 0 40px;width:40px;height:40px;display:flex;align-items:center;justify-content:center;border:1px solid var(--accent);background:var(--bg);color:var(--accent);font-size:12px;letter-spacing:1px;position:relative;z-index:1}
.p-steps li:last-child .num{background:var(--accent);color:var(--bg)}
.p-steps h2{font-size:1.35rem;margin:8px 0 6px}
.p-steps p{font-size:14.5px;color:var(--dim);line-height:1.7}
@media(max-width:560px){main{padding:40px 18px 72px}.back{margin-bottom:28px}.p-head h1{font-size:2.4rem}.p-cta{margin-top:40px}.p-cta .stamp{flex:1;text-align:center}.p-steps li{gap:16px}.p-steps .num{flex-basis:34px;width:34px;height:34px}.p-steps::before{left:16px}.foot{gap:8px 12px}}