:root{--bg:#0B0F14;--bg2:#111926;--paper:#F3F1EA;--ink:#111A22;--tx:#E7EDF2;--dim:#8C9BA8;--line:rgba(231,237,242,.13);--ac:#5FD4C0;--acD:#2E7D6F;--am:#E8A33D;--rd:#D95A4E;--disp:'Space Grotesk',system-ui,sans-serif;--body:'IBM Plex Sans',system-ui,sans-serif;--mono:'IBM Plex Mono',ui-monospace,monospace;--max:1120px}
html[lang=fa],html[lang=ar]{--disp:'Vazirmatn',system-ui,sans-serif;--body:'Vazirmatn',system-ui,sans-serif;--mono:'Vazirmatn',system-ui,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--tx);font:400 17px/1.78 var(--body);-webkit-font-smoothing:antialiased}a{color:inherit}::selection{background:var(--ac);color:#06231E}.wrap{max-width:var(--max);margin:auto;padding:0 clamp(18px,4.5vw,54px)}
.skip{position:fixed;top:8px;inset-inline-start:10px;z-index:100;transform:translateY(-150%);background:var(--ac);color:#06231E;padding:9px 13px;text-decoration:none}.skip:focus{transform:none}
header{position:sticky;top:0;z-index:40;background:rgba(11,15,20,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.bar{min-height:66px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:9px;text-decoration:none;font:700 18px var(--disp)}.brand svg{width:26px;height:26px}.nav{margin-inline-start:auto;display:flex;gap:20px;align-items:center}.nav a,.langs a{font:500 10px var(--mono);letter-spacing:.12em;text-transform:uppercase;text-decoration:none;color:var(--dim)}.nav a:hover,.langs a:hover{color:var(--tx)}.langs{display:flex;border:1px solid var(--line);border-radius:3px;overflow:hidden}.langs a{padding:8px 9px}.langs a[aria-current=page]{background:var(--ac);color:#06231E}.menu{display:none}
.hero{padding:clamp(72px,10vw,124px) 0 62px;border-bottom:1px solid var(--line);position:relative;overflow:hidden}.hero:after{content:'';position:absolute;inset:-10% -20%;pointer-events:none;background:radial-gradient(circle at 75% 25%,rgba(95,212,192,.12),transparent 32%),radial-gradient(circle at 20% 80%,rgba(232,163,61,.06),transparent 28%)}.kicker{font:500 11px var(--mono);letter-spacing:.2em;text-transform:uppercase;color:var(--ac);position:relative;z-index:1}.hero h1{font:700 clamp(2.6rem,7vw,5rem)/1.02 var(--disp);letter-spacing:-.035em;max-width:15ch;margin:16px 0 22px;position:relative;z-index:1}.hero p{max-width:66ch;color:var(--dim);font-size:clamp(1.05rem,2vw,1.25rem);position:relative;z-index:1}.crumbs{font:500 10px var(--mono);letter-spacing:.08em;color:var(--dim);margin-bottom:24px}.crumbs a{text-decoration:none;color:var(--ac)}
main section{padding:64px 0;border-bottom:1px solid var(--line)}h2{font:700 clamp(1.7rem,3.3vw,2.7rem)/1.1 var(--disp);letter-spacing:-.025em;margin:0 0 18px}h3{font:700 1.25rem var(--disp);margin:30px 0 10px}p{margin:0 0 18px}.lede{font-size:1.18rem;color:var(--dim);max-width:70ch}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:28px}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:28px}.card{border:1px solid var(--line);background:var(--bg2);padding:24px;border-radius:5px}.card h3{margin-top:0}.card p{color:var(--dim);font-size:.96rem}.card a{color:var(--ac);text-decoration:none;font:600 11px var(--mono);letter-spacing:.08em;text-transform:uppercase}
.diagram{border:1px solid var(--line);background:#0D1319;border-radius:5px;overflow:hidden;margin:32px 0}.diagram figcaption{padding:10px 14px;border-bottom:1px solid var(--line);font:500 10px var(--mono);letter-spacing:.13em;text-transform:uppercase;color:var(--dim)}.diagram svg{display:block;width:100%;height:auto}.dline{stroke:#718594;stroke-width:2;fill:none;stroke-dasharray:5 8}.mline{stroke:var(--ac);stroke-width:3;fill:none;stroke-dasharray:1;stroke-dashoffset:1;animation:draw 2.6s ease-in-out infinite}.packet{fill:var(--ac);filter:drop-shadow(0 0 5px rgba(95,212,192,.5));animation:pulse 1.8s ease-in-out infinite}.offline{opacity:.25}.warn{stroke:var(--rd);fill:none}.node{fill:#CFE3EE}.node2{fill:var(--ac)}.amber{fill:var(--am)}@keyframes draw{0%{stroke-dashoffset:1}45%,100%{stroke-dashoffset:0}}@keyframes pulse{50%{opacity:.35}}
.callout{border-inline-start:2px solid var(--ac);padding:4px 0 4px 18px;margin:28px 0;color:var(--dim)}.callout strong{color:var(--tx)}.states{display:grid;gap:8px;margin-top:20px}.state{display:grid;grid-template-columns:150px 1fr;gap:16px;padding:12px 0;border-bottom:1px solid var(--line)}.state b{font:600 12px var(--mono);letter-spacing:.08em;color:var(--ac);text-transform:uppercase}.state span{color:var(--dim)}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 18px;border:1px solid var(--acD);color:var(--ac);text-decoration:none;font:600 11px var(--mono);letter-spacing:.12em;text-transform:uppercase;border-radius:3px}.btn:hover{background:var(--ac);color:#06231E}.btn.ghost{border-color:var(--line);color:var(--dim)}
footer{padding:42px 0}.foot{display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:26px}.foot h4{font:600 10px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}.foot ul{list-style:none;padding:0;margin:12px 0 0}.foot li{margin:8px 0}.foot a{text-decoration:none;color:var(--dim)}.foot a:hover{color:var(--ac)}.fine{border-top:1px solid var(--line);padding-top:18px;margin-top:30px;color:var(--dim);font-size:.82rem}
html[dir=rtl] .hero h1,html[dir=rtl] .hero p,html[dir=rtl] main{text-align:right}html[dir=rtl] .callout{padding:4px 18px 4px 0}
@media(max-width:850px){.nav{display:none}.bar{gap:12px}.langs{margin-inline-start:auto}.grid2,.cards,.foot{grid-template-columns:1fr}.hero{padding-top:64px}.state{grid-template-columns:1fr}.diagram{margin-inline:-4px}}
@media(max-width:430px){.wrap{padding-inline:14px}.brand{font-size:15px}.langs a{padding:8px 7px;font-size:9px}.hero h1{font-size:2.45rem}.card{padding:18px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important}.mline{stroke-dashoffset:0}}


/* ---------- PHASE 2 HEADER REBUILD ---------- */
header{background:linear-gradient(180deg,rgba(5,12,18,.97),rgba(8,16,24,.92));border-bottom:1px solid rgba(157,239,255,.1);box-shadow:0 12px 34px rgba(0,0,0,.12)}
.bar{min-height:72px;gap:16px;position:relative}
.brand{font:700 20px/1 var(--disp);letter-spacing:-.025em;gap:9px;white-space:nowrap}
.brand svg{display:none!important}
.brand::before{content:"";width:36px;height:36px;flex:none;background:linear-gradient(135deg,#F0FBFF 0%,#8FEDE3 58%,#55DFFF 100%);-webkit-mask:url("/assets/brand/rezmesh-mark.svg") center/contain no-repeat;mask:url("/assets/brand/rezmesh-mark.svg") center/contain no-repeat;filter:drop-shadow(0 0 8px rgba(95,212,192,.32))}
.nav{gap:16px}
.nav a{font:500 11px/1 var(--body);letter-spacing:.01em;text-transform:none;padding:27px 0 24px;position:relative;color:#B7C5CF}
.nav a::after{content:"";position:absolute;inset-inline:0;bottom:18px;height:2px;background:#55DFFF;transform:scaleX(0);transition:transform .25s}
.nav a:hover,.nav a[aria-current="page"]{color:#fff}
.nav a:hover::after,.nav a[aria-current="page"]::after{transform:scaleX(1)}
.langs{border-radius:999px;background:rgba(9,19,28,.52);padding:2px}
.langs a{padding:8px 8px;border-radius:999px}
.langs a[aria-current=page]{background:rgba(95,212,192,.16);color:#8EF1E0}
.nav-menu{display:none;margin-inline-start:auto;position:relative}
.nav-menu summary{list-style:none;width:38px;height:38px;border:1px solid rgba(207,227,238,.17);border-radius:999px;display:grid;place-items:center;cursor:pointer}
.nav-menu summary::-webkit-details-marker{display:none}
.nav-menu summary span,.nav-menu summary::before,.nav-menu summary::after{content:"";display:block;width:16px;height:1.5px;background:var(--tx);transition:.2s}
.nav-menu summary{gap:4px}
.nav-menu[open] summary::before{transform:translateY(5.5px) rotate(45deg)}
.nav-menu[open] summary span{opacity:0}
.nav-menu[open] summary::after{transform:translateY(-5.5px) rotate(-45deg)}
.nav-menu nav{position:absolute;top:48px;inset-inline-end:0;width:min(300px,calc(100vw - 28px));background:rgba(5,12,18,.99);border:1px solid rgba(157,239,255,.14);border-radius:10px;padding:8px 14px;box-shadow:0 24px 60px rgba(0,0,0,.4)}
.nav-menu nav a{display:block;text-decoration:none;color:#C6D2DA;padding:13px 4px;border-bottom:1px solid rgba(231,237,242,.08);font:500 13px/1 var(--body)}
.nav-menu nav a:last-child{border-bottom:0}
.nav-menu nav a[aria-current="page"]{color:var(--ac)}
@media(max-width:1180px){
  .nav{display:none}
  .nav-menu{display:block}
  .langs{margin-inline-start:0}
}
@media(max-width:430px){
  .bar{gap:8px;min-height:66px}
  .brand{font-size:16px;gap:7px}
  .brand::before{width:30px;height:30px}
  .nav-menu summary{width:34px;height:34px}
  .langs a{padding:7px 6px;font-size:8.5px}
  .wrap{padding-inline:14px}
}