:root{
    --navy:#0A3D91; --blue:#1E6BCE; --red:#D62828; --gray:#6B7280;
    --ink:#0C1526; --bg:#F5F6F8; --paper:#FFFFFF;
    --line:rgba(10,61,145,.16);
    --hero:#08122B;
    box-sizing:border-box;
    padding-top:env(safe-area-inset-top,0px);
    padding-bottom:env(safe-area-inset-bottom,0px);
  }
  *{box-sizing:inherit; margin:0; padding:0;}
  html{scroll-padding-top:80px;}
  html,body{height:100%;}
  body{
    background:var(--bg); color:var(--ink);
    font-family:'Montserrat',sans-serif; font-size:16px; line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%; display:block;}
  h1,h2,h3{font-family:'Exo 2',sans-serif; font-weight:700; letter-spacing:-.01em;}
  .mono{font-family:'JetBrains Mono',monospace;}
  .wrap{max-width:1120px; margin:0 auto; padding:0 28px;}
  a{color:inherit; text-decoration:none;}

  /* Nav */
  header.site{
    position:sticky; top:0; z-index:50; background:var(--paper);
    border-bottom:1px solid var(--line);
    padding-top:env(safe-area-inset-top,0px);
  }
  .nav{display:flex; align-items:center; justify-content:space-between; height:84px;}
  .nav img.logo{height:48px; width:auto;}
  .nav-links{display:flex; gap:32px; align-items:center;}
  .nav-links a{font-size:14.5px; font-weight:600; color:var(--ink); padding:6px 2px; border-bottom:2px solid transparent;}
  .nav-links a:hover{border-color:var(--red);}
  .lang{font-family:'JetBrains Mono',monospace; font-size:12.5px; font-weight:500; color:var(--gray); border:1px solid var(--line); padding:5px 10px;}
  @media(max-width:760px){
    html{scroll-padding-top:128px;}
    .nav{height:auto; flex-wrap:wrap; padding:10px 28px 4px; row-gap:6px;}
    .nav img.logo{height:40px;}
    .nav-links{order:3; width:100%; gap:22px; overflow-x:auto; white-space:nowrap; padding-bottom:6px;}
    .nav-links a{font-size:13.5px;}
  }

  /* Hero */
  .hero{
    background:var(--hero); color:#fff; position:relative; overflow:hidden;
    padding:88px 0 96px;
    background-image:
      repeating-linear-gradient(0deg, rgba(30,107,206,.14) 0 1px, transparent 1px 64px),
      repeating-linear-gradient(90deg, rgba(30,107,206,.14) 0 1px, transparent 1px 64px);
  }
  .hero::after{
    content:""; position:absolute; right:-10%; top:-20%; width:60%; height:140%;
    background:linear-gradient(135deg, rgba(214,40,40,.16), transparent 55%);
    clip-path:polygon(30% 0,100% 0,100% 100%,0% 100%);
  }
  .hero-inner{position:relative;}
  .kicker{font-family:'JetBrains Mono',monospace; font-size:13px; color:#9FB6E8; letter-spacing:.04em;}
  .hero h1{font-size:44px; line-height:1.14; margin:18px 0 20px; max-width:640px;}
  .hero h1 em{font-style:normal; color:#fff; background:linear-gradient(180deg,transparent 62%, var(--red) 62%);}
  .hero p{font-size:17px; color:#C7D3EA; max-width:520px; margin-bottom:34px;}
  .btn{
    display:inline-block; font-weight:700; font-size:14.5px; padding:14px 26px;
    background:var(--red); color:#fff; clip-path:polygon(0 0,100% 0,100% 70%,94% 100%,0 100%);
  }
  .btn:hover{background:#B81E1E;}
  .btn.ghost{background:transparent; color:#fff; border:1px solid rgba(255,255,255,.35); clip-path:none; margin-left:14px;}

  /* Value strip */
  .strip{background:var(--paper); border-bottom:1px solid var(--line);}
  .strip .wrap{display:grid; grid-template-columns:repeat(3,1fr); gap:0;}
  .strip div{padding:26px 28px; border-left:1px solid var(--line);}
  .strip div:first-child{border-left:none;}
  .strip h3{font-size:15px; margin-bottom:6px;}
  .strip p{font-size:14px; color:var(--gray); line-height:1.5;}
  @media(max-width:760px){ .strip .wrap{grid-template-columns:1fr;} .strip div{border-left:none; border-top:1px solid var(--line);} .strip div:first-child{border-top:none;} }

  section{padding:72px 0;}
  section.wrap{padding-top:48px; padding-bottom:48px;}
  .section-head{display:flex; justify-content:space-between; align-items:flex-end; margin-bottom:32px; gap:20px; flex-wrap:wrap;}
  .section-head h2{font-size:28px;}
  .section-head p{color:var(--gray); font-size:14.5px; max-width:380px;}

  /* Featured article */
  .feature{background:var(--paper); border:1px solid var(--line); display:grid; grid-template-columns:1.1fr 1fr;}
  .feature-body{padding:40px;}
  .tag{display:inline-block; font-family:'JetBrains Mono',monospace; font-size:11.5px; color:var(--blue); background:rgba(30,107,206,.09); padding:4px 9px; margin-bottom:16px;}
  .feature h3{font-size:24px; margin-bottom:12px;}
  .feature p{color:var(--gray); font-size:15px; margin-bottom:22px;}
  .feature-visual{
    background:radial-gradient(120% 130% at 30% 20%, #123a7a 0%, var(--navy) 45%, #061b40 100%);
    position:relative; overflow:hidden;
    display:flex; align-items:center; justify-content:center; padding:30px;
    box-shadow:inset 0 0 0 1px rgba(255,255,255,.06);
  }
  .feature-visual::before{
    content:""; position:absolute; inset:0;
    background-image:repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 2px, transparent 2px 30px);
  }
  .feature-visual img{
    position:relative; width:104px; height:auto;
    filter:drop-shadow(0 10px 24px rgba(0,0,0,.45));
  }
  .link-arrow{font-weight:700; font-size:14.5px; color:var(--navy); border-bottom:2px solid var(--red); padding-bottom:2px;}
  @media(max-width:760px){ .feature{grid-template-columns:1fr;} .feature-visual{min-height:160px;} }

  /* Topics */
  .topics{display:flex; flex-wrap:wrap; gap:10px;}
  .topics span{font-family:'JetBrains Mono',monospace; font-size:13px; border:1px solid var(--line); padding:9px 14px; color:var(--ink); background:var(--paper);}

  /* Areas (pillars) */
  .pillars{display:grid; grid-template-columns:repeat(4,1fr); gap:20px;}
  .pillar{background:var(--paper); border:1px solid var(--line); padding:28px; display:block;}
  a.pillar:hover{border-color:var(--red);}
  .pillar h3{font-size:19px; margin:10px 0 8px;}
  .pillar p{font-size:14.5px; color:var(--gray);}
  .pillar .tag{margin-bottom:0;}
  .pillar.muted{background:transparent; border-style:dashed;}
  @media(max-width:980px){ .pillars{grid-template-columns:repeat(2,1fr);} }
  @media(max-width:760px){ .pillars{grid-template-columns:1fr;} }

  /* Article cards (home) */
  .cards{display:grid; grid-template-columns:repeat(2,1fr); gap:20px;}
  .cards .pillar h3{font-size:18px; line-height:1.3;}
  @media(max-width:760px){ .cards{grid-template-columns:1fr;} }

  /* Calculators teaser */
  .calc-teaser{background:var(--paper); border:1px solid var(--line); border-left:3px solid var(--red); padding:28px 32px; display:flex; justify-content:space-between; align-items:center; gap:20px; flex-wrap:wrap;}
  .calc-teaser h3{font-size:19px; margin:10px 0 6px;}
  .calc-teaser p{color:var(--gray); font-size:14.5px;}

  /* Calculators */
  .calcs{display:grid; grid-template-columns:repeat(3,1fr); gap:20px;}
  .calc{background:var(--paper); border:1px solid var(--line); padding:26px;}
  .calc h3{font-size:17px; margin:8px 0 6px;}
  .calc p{font-size:14px; color:var(--gray);}
  @media(max-width:760px){ .calcs{grid-template-columns:1fr;} }

  /* About / services */
  .about{background:var(--paper); border-top:1px solid var(--line); border-bottom:1px solid var(--line);}
  .about .wrap{display:grid; grid-template-columns:1fr 1fr; gap:56px;}
  .about h2{font-size:26px; margin-bottom:16px;}
  .about p{color:var(--gray); font-size:15px; margin-bottom:14px;}
  .services{display:flex; flex-direction:column; gap:0;}
  .services div{padding:18px 0; border-top:1px solid var(--line); display:flex; justify-content:space-between; align-items:center;}
  .services div:first-child{border-top:none;}
  .services h4{font-size:15.5px; font-weight:600;}
  .soon{font-family:'JetBrains Mono',monospace; font-size:11px; color:var(--gray);}
  @media(max-width:760px){ .about .wrap{grid-template-columns:1fr;} }

  footer{background:var(--hero); color:#9FB6E8; padding:48px 0 32px;}
  footer .wrap{display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:20px;}
  footer img{height:34px;}
  footer p{font-size:13px;}
  footer .cols{display:flex; gap:36px; font-size:13.5px;}
  footer .cols a:hover{color:#fff;}
  footer .cols{flex-wrap:wrap; gap:10px 28px;}

  /* Article page */
  .art-head{
    background-color:var(--hero); color:#fff; padding:56px 0 52px; position:relative; overflow:hidden;
    background-image:
      repeating-linear-gradient(0deg, rgba(30,107,206,.14) 0 1px, transparent 1px 64px),
      repeating-linear-gradient(90deg, rgba(30,107,206,.14) 0 1px, transparent 1px 64px);
    border-bottom:3px solid var(--red);
  }
  .art-head::after{
    content:""; position:absolute; right:-10%; top:-30%; width:55%; height:160%;
    background:linear-gradient(135deg, rgba(214,40,40,.14), transparent 55%);
    clip-path:polygon(30% 0,100% 0,100% 100%,0% 100%);
  }
  .art-head .wrap{position:relative; z-index:1;}
  .art-head .tag{background:rgba(255,255,255,.12); color:#C7D3EA;}
  .art-head h1{font-size:36px; line-height:1.2; margin:16px 0 16px; max-width:760px;}
  .band-lead{color:#C7D3EA; font-size:16px; max-width:620px;}
  .art-meta{color:#9FB6E8; font-size:13.5px; font-family:'JetBrains Mono',monospace;}
  .art-body{max-width:700px; margin:0 auto; padding:56px 28px;}
  .art-body h2{font-size:22px; margin:36px 0 14px;}
  .art-body p{margin-bottom:16px; font-size:16px; color:#232B3D;}
  .art-body ol{margin:18px 0 24px 22px;}
  .art-body li{margin-bottom:12px; font-size:15.5px;}
  .callout{border:1px solid var(--line); border-left:3px solid var(--red); background:#FBFBFC; padding:20px 24px; margin:28px 0;}
  .callout p{margin-bottom:0; font-size:14.5px; color:var(--gray);}
  .art-body ul{margin:18px 0 24px 22px;}
  .formula{font-family:'JetBrains Mono',monospace; font-size:15px; background:#F1F4FA; border:1px solid var(--line); border-left:3px solid var(--navy); padding:16px 20px; margin:22px 0; overflow-x:auto; line-height:1.9;}
  .table-wrap{overflow-x:auto; margin:22px 0;}
  .art-table{width:100%; min-width:520px; border-collapse:collapse; font-size:14.5px;}
  .art-table th{font-family:'Exo 2',sans-serif; text-align:left; background:var(--hero); color:#fff; padding:10px 14px; font-weight:600;}
  .art-table td{padding:11px 14px; border-bottom:1px solid var(--line); vertical-align:top; color:#232B3D;}
  .art-table tr:nth-child(even) td{background:#FBFBFC;}
  .art-note{font-size:13.5px; color:var(--gray);}
  .back{display:inline-block; margin:0 auto 8px; max-width:700px; padding:24px 28px 0; font-size:14px; font-weight:600;}
  @media(max-width:760px){ .art-head h1{font-size:27px;} }
  .art-table td:first-child{white-space:nowrap;}