:root{
    --bg:#ffffff;
    --bg-raised:#f3f5f7;
    --line:#dde2e6;
    --line-soft:#ebeef1;
    --text:#182335;
    --text-dim:#57626f;
    --text-faint:#8a929b;
    --bronze:#2f6fb0;
    --bronze-soft:#1f4d7a;
    --steel:#16284a;
    --radius:2px;
    --wrap:1180px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--text);
    font-family:'Inter',sans-serif;
    font-size:16px;
    line-height:1.55;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,.display{
    font-family:'Space Grotesk',sans-serif;
    font-weight:600;
    letter-spacing:-0.01em;
    margin:0;
  }
  a{color:inherit;text-decoration:none;}
  img{max-width:100%;display:block;}
  .wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px;}
  @media (max-width:640px){.wrap{padding:0 20px;}}

  /* focus visibility */
  a:focus-visible, button:focus-visible{
    outline:2px solid var(--bronze);
    outline-offset:3px;
  }

  /* ---------- Header ---------- */
  header{
    position:sticky; top:0; z-index:50;
    background:rgba(255,255,255,0.9);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line-soft);
  }
  .nav{
    display:flex; align-items:center; justify-content:space-between;
    height:76px;
  }
  .logo{
    font-family:'Space Grotesk',sans-serif;
    font-weight:700;
    font-size:1.35rem;
    letter-spacing:-0.02em;
  }
  .logo span{color:var(--bronze);}
  .nav-links{
    display:flex; align-items:center; gap:36px;
    font-size:0.95rem;
    color:var(--text-dim);
  }
  .nav-links a{transition:color .15s ease;}
  .nav-links a:hover{color:var(--text);}
  .nav-cta{
    padding:10px 22px;
    border:1px solid var(--bronze-soft);
    color:var(--text);
    font-size:0.9rem;
    font-weight:500;
    border-radius:var(--radius);
    transition:background .15s ease, border-color .15s ease;
  }
  .nav-cta:hover{background:rgba(47,111,176,0.08); border-color:var(--bronze);}
  .nav-toggle{display:none; background:none; border:none; color:var(--text); font-size:1.6rem; cursor:pointer;}
  @media (max-width:860px){
    .nav-links{
      position:fixed; top:76px; left:0; right:0;
      background:var(--bg-raised);
      flex-direction:column; align-items:flex-start;
      gap:0; border-bottom:1px solid var(--line);
      max-height:0; overflow:hidden; transition:max-height .25s ease;
    }
    .nav-links.open{max-height:340px;}
    .nav-links a, .nav-links .nav-cta{
      width:100%; padding:16px 32px; border-bottom:1px solid var(--line-soft);
    }
    .nav-cta{border:none; margin:0;}
    .nav-toggle{display:block;}
  }

  /* ---------- Hero ---------- */
  .hero{
    padding:96px 0 88px;
    border-bottom:1px solid var(--line-soft);
  }
  .hero-grid{
    display:grid;
    grid-template-columns:1.15fr 0.85fr;
    gap:64px;
    align-items:center;
  }
  .hero h1{
    font-size:clamp(2.4rem, 4.6vw, 3.6rem);
    line-height:1.08;
    max-width:15ch;
  }
  .hero p.lede{
    margin-top:22px;
    font-size:1.1rem;
    color:var(--text-dim);
    max-width:46ch;
  }
  .hero-actions{margin-top:36px; display:flex; gap:16px; flex-wrap:wrap;}
  .btn{
    display:inline-block;
    padding:14px 26px;
    font-size:0.95rem;
    font-weight:500;
    border-radius:var(--radius);
    transition:transform .12s ease, background .15s ease, border-color .15s ease;
  }
  .btn-solid{background:var(--bronze); color:#ffffff;}
  .btn-solid:hover{background:#3f83c4;}
  .btn-line{border:1px solid var(--line);}
  .btn-line:hover{border-color:var(--text-faint);}

  .hero-art{display:flex; justify-content:center;}
  .hero-art svg{width:100%; max-width:380px; height:auto;}

  .stat-strip{
    margin-top:72px;
    display:grid;
    grid-template-columns:repeat(4,1fr);
    border-top:1px solid var(--line-soft);
    padding-top:32px;
  }
  .stat-strip div + div{border-left:1px solid var(--line-soft); padding-left:28px;}
  .stat-num{font-family:'Space Grotesk',sans-serif; font-size:1.9rem; font-weight:600; color:var(--text);}
  .stat-label{font-size:0.85rem; color:var(--text-faint); margin-top:4px;}
  @media (max-width:860px){
    .hero-grid{grid-template-columns:1fr; gap:48px;}
    .hero-art{order:-1;}
    .hero-art svg{max-width:260px;}
    .stat-strip{grid-template-columns:repeat(2,1fr); row-gap:28px;}
    .stat-strip div:nth-child(3){border-left:none;}
  }

  /* ---------- Section shell ---------- */
  section{padding:96px 0;}
  section + section{border-top:1px solid var(--line-soft);}
  .section-head{max-width:640px; margin-bottom:56px;}
  .section-head h2{font-size:clamp(1.7rem,3vw,2.2rem);}
  .section-head p{margin-top:14px; color:var(--text-dim); font-size:1.02rem;}

  /* ---------- Systems ---------- */
  .cat-group{margin-bottom:64px;}
  .cat-group:last-child{margin-bottom:0;}
  .cat-title{
    display:flex; align-items:baseline; gap:14px;
    margin-bottom:28px;
    padding-bottom:14px;
    border-bottom:1px solid var(--line-soft);
  }
  .cat-title h3{font-size:1.3rem;}
  .cat-title span{color:var(--text-faint); font-size:0.9rem;}

  .card-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:1px;
    background:var(--line-soft);
    border:1px solid var(--line-soft);
  }
  @media (max-width:940px){.card-grid{grid-template-columns:repeat(2,1fr);}}
  @media (max-width:640px){.card-grid{grid-template-columns:1fr;}}

  .card{
    background:var(--bg);
    padding:28px 26px 24px;
    transition:background .15s ease;
  }
  .card:hover{background:var(--bg-raised);}
  .card-icon{
    width:100%; height:96px; color:var(--bronze); margin-bottom:20px;
    background:var(--bg-raised); border:1px solid var(--line-soft);
    display:flex; align-items:center; justify-content:center;
  }
  .card-icon svg{width:78%; height:78%;}
  .card h4{font-size:1.05rem; font-weight:600; font-family:'Space Grotesk',sans-serif;}
  .card .series-code{color:var(--text-faint); font-size:0.82rem; margin-top:2px;}
  .card .desc{color:var(--text-dim); font-size:0.92rem; margin-top:12px; min-height:42px;}
  .spec-row{
    margin-top:18px; padding-top:16px;
    border-top:1px solid var(--line-soft);
    display:flex; flex-direction:column; gap:6px;
    font-size:0.84rem;
  }
  .spec-row div{display:flex; justify-content:space-between; color:var(--text-dim);}
  .spec-row b{color:var(--text); font-weight:500;}

  .full-spec{margin-top:2px; border-top:none;}
  .full-spec summary{
    list-style:none; cursor:pointer;
    display:flex; align-items:center; justify-content:space-between;
    padding:11px 0 0;
    font-size:0.82rem; color:var(--bronze);
    font-weight:500;
  }
  .full-spec summary::-webkit-details-marker{display:none;}
  .full-spec summary::after{content:"+"; font-size:1.1rem; line-height:1;}
  .full-spec[open] summary::after{content:"\2212";}
  .full-spec table{
    width:100%; border-collapse:collapse; margin-top:14px; font-size:0.82rem;
  }
  .full-spec td{
    padding:8px 0; border-top:1px solid var(--line-soft);
    color:var(--text-dim); vertical-align:top;
  }
  .full-spec td:first-child{color:var(--text-faint); width:42%; padding-right:10px;}
  .full-spec td b{color:var(--text); font-weight:500;}

  /* ---------- Why ---------- */
  .why-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:48px;
  }
  @media (max-width:860px){.why-grid{grid-template-columns:1fr; gap:40px;}}
  .why-item .num{
    font-family:'Space Grotesk',sans-serif;
    color:var(--bronze-soft);
    font-size:0.95rem;
    margin-bottom:14px;
    letter-spacing:0.02em;
  }
  .why-item h3{font-size:1.15rem; margin-bottom:12px;}
  .why-item p{color:var(--text-dim); font-size:0.96rem;}

  /* ---------- Process ---------- */
  .process{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:0;
    border-top:1px solid var(--line-soft);
    border-left:1px solid var(--line-soft);
  }
  @media (max-width:760px){.process{grid-template-columns:repeat(2,1fr);}}
  .process div{
    padding:28px 24px;
    border-right:1px solid var(--line-soft);
    border-bottom:1px solid var(--line-soft);
  }
  .process .step-n{color:var(--bronze); font-family:'Space Grotesk',sans-serif; font-weight:600; font-size:1.1rem;}
  .process h4{margin-top:10px; font-size:1rem; font-family:'Space Grotesk',sans-serif;}
  .process p{margin-top:8px; color:var(--text-dim); font-size:0.88rem;}

  /* ---------- Contact ---------- */
  .contact{
    background:var(--bg-raised);
    border-top:1px solid var(--line-soft);
    border-bottom:1px solid var(--line-soft);
  }
  .contact-grid{
    display:grid;
    grid-template-columns:1.1fr 0.9fr;
    gap:64px;
  }
  @media (max-width:860px){.contact-grid{grid-template-columns:1fr; gap:40px;}}
  .contact h2{font-size:clamp(1.7rem,3vw,2.2rem); max-width:16ch;}
  .contact p.lede{color:var(--text-dim); margin-top:16px; max-width:48ch;}
  .contact-list{margin-top:36px; display:flex; flex-direction:column; gap:20px;}
  .contact-list a{font-size:1.05rem; border-bottom:1px solid var(--line); padding-bottom:14px; display:block; transition:color .15s ease, border-color .15s ease;}
  .contact-list a:hover{color:var(--bronze); border-color:var(--bronze-soft);}
  .contact-list .label{display:block; font-size:0.8rem; color:var(--text-faint); margin-bottom:4px;}

  form{display:flex; flex-direction:column; gap:16px;}
  form input, form select, form textarea{
    background:var(--bg);
    border:1px solid var(--line);
    color:var(--text);
    padding:14px 16px;
    font-family:'Inter',sans-serif;
    font-size:0.95rem;
    border-radius:var(--radius);
  }
  form label{font-size:0.82rem; color:var(--text-faint); margin-bottom:6px; display:block;}
  form textarea{resize:vertical; min-height:100px;}
  form button{
    margin-top:6px;
    align-self:flex-start;
    background:var(--bronze);
    color:#ffffff;
    border:none;
    padding:14px 30px;
    font-size:0.95rem;
    font-weight:600;
    border-radius:var(--radius);
    cursor:pointer;
    font-family:'Inter',sans-serif;
    transition:background .15s ease;
  }
  form button:hover{background:#3f83c4;}
  .form-note{font-size:0.82rem; color:var(--text-faint); margin-top:4px;}

  /* ---------- Footer ---------- */
  footer{padding:48px 0;}
  .foot-grid{
    display:flex; justify-content:space-between; align-items:center;
    flex-wrap:wrap; gap:20px;
  }
  .foot-grid .logo{font-size:1.1rem;}
  footer .fine{color:var(--text-faint); font-size:0.85rem;}

  @media (prefers-reduced-motion: reduce){
    html{scroll-behavior:auto;}
    *{transition:none !important;}
  }

  .nav-item{position:relative;}
  .nav-parent{display:flex; align-items:center; gap:6px; cursor:pointer;}
  .mega-menu{
    display:none; position:absolute; top:calc(100% + 1px); left:50%; transform:translateX(-50%);
    background:var(--bg-raised); border:1px solid var(--line); border-top:2px solid var(--bronze);
    padding:28px; z-index:60; width:640px; box-shadow:0 20px 40px rgba(0,0,0,0.35);
  }
  .nav-item.has-mega:hover .mega-menu{display:block;}
  .mega-inner{display:grid; grid-template-columns:repeat(4,1fr); gap:28px;}
  .mega-col h5{font-family:'Space Grotesk',sans-serif; font-size:0.78rem; color:var(--text-faint); text-transform:uppercase; letter-spacing:0.06em; margin-bottom:14px; font-weight:600;}
  .mega-col a{display:block; font-size:0.86rem; color:var(--text-dim); padding:7px 0; transition:color .15s ease;}
  .mega-col a span{display:block; font-size:0.74rem; color:var(--text-faint); margin-top:1px;}
  .mega-col a:hover, .mega-col a.active{color:var(--bronze);}
  .mega-cta a{color:var(--steel); font-weight:500;}
  @media (max-width:860px){
    .mega-menu{display:none !important; position:static; transform:none; width:auto; border:none; box-shadow:none; padding:0 0 0 32px; background:transparent;}
    .nav-item.has-mega.open .mega-menu{display:block !important;}
    .mega-inner{grid-template-columns:1fr; gap:4px;}
    .mega-col{border-bottom:1px solid var(--line-soft); padding:10px 0;}
    .mega-col:last-child{border-bottom:none;}
    .nav-parent{width:100%; padding:16px 32px; border-bottom:1px solid var(--line-soft); justify-content:space-between;}
  }

  .breadcrumb{font-size:0.85rem; color:var(--text-faint); margin-bottom:28px;}
  .breadcrumb a{color:var(--text-dim);}
  .breadcrumb a:hover{color:var(--bronze);}
  .sys-hero{padding:56px 0 0;}
  .sys-kicker{color:var(--bronze); font-size:0.85rem; font-weight:500; margin-bottom:10px;}
  .sys-hero h1{font-size:clamp(2rem,4vw,2.8rem); max-width:20ch;}
  .sys-type{color:var(--text-dim); font-size:1.15rem; margin-top:8px;}
  .sys-desc{color:var(--text-dim); font-size:1.02rem; max-width:62ch; margin-top:22px; line-height:1.6;}
  .sys-visual-grid{display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--line-soft); border:1px solid var(--line-soft); margin-top:48px;}
  @media (max-width:760px){.sys-visual-grid{grid-template-columns:1fr;}}
  .sys-visual{background:var(--bg); padding:40px; display:flex; flex-direction:column; align-items:center; justify-content:center; min-height:320px;}
  .sys-visual svg{width:100%; max-width:280px; height:auto; color:var(--bronze);}
  .sys-visual .cap{margin-top:20px; font-size:0.82rem; color:var(--text-faint);}
  .sys-spec-table{width:100%; border-collapse:collapse; margin-top:20px;}
  .sys-spec-table td{padding:16px 4px; border-top:1px solid var(--line-soft); font-size:0.95rem;}
  .sys-spec-table td:first-child{color:var(--text-faint); width:36%;}
  .sys-spec-table td b{color:var(--text); font-weight:500;}
  .sys-cta-row{margin-top:40px; display:flex; gap:16px; flex-wrap:wrap;}
  .related-title{font-size:1.1rem; margin-bottom:24px;}
  .related-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:20px;}
  @media (max-width:760px){.related-grid{grid-template-columns:1fr;}}
  .related-card{border:1px solid var(--line-soft); padding:22px; transition:border-color .15s ease, background .15s ease;}
  .related-card:hover{border-color:var(--bronze-soft); background:var(--bg-raised);}
  .related-card .rc-code{font-family:'Space Grotesk',sans-serif; font-weight:600; font-size:1.05rem;}
  .related-card .rc-type{color:var(--text-faint); font-size:0.82rem; margin-top:2px;}

  .profile-items-block{margin-top:56px; padding-top:40px; border-top:1px solid var(--line-soft);}
  .profile-items-title{font-size:1.1rem;}
  .profile-items-note{color:var(--text-dim); font-size:0.9rem; max-width:60ch; margin-top:10px; line-height:1.55;}
  .profile-items-table{width:100%; border-collapse:collapse; margin-top:22px; font-size:0.88rem;}
  .profile-items-table th{
    text-align:left; font-family:'Space Grotesk',sans-serif; font-weight:600;
    font-size:0.78rem; color:var(--text-faint); text-transform:uppercase; letter-spacing:0.04em;
    padding:0 14px 12px 0; border-bottom:1px solid var(--line);
  }
  .profile-items-table td{padding:12px 14px 12px 0; border-bottom:1px solid var(--line-soft); color:var(--text-dim);}
  .profile-items-table td:first-child{color:var(--text); font-weight:500; font-family:'Space Grotesk',sans-serif;}
  .profile-items-table tr:hover td{background:var(--bg-raised);}