:root{
    --ink:#101a33;
    --paper:#f6f7fa;
    --paper-dim:#eceff5;
    --concrete:#a7aebb;
    --line:#dde1e9;
    --steel:#3552a8;
    --navy:#0e1a3f;
    --slate:#8891a0;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:'Noto Sans JP', sans-serif;
    font-weight:400;
    line-height:1.85;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3{
    font-family:'Zen Kaku Gothic New', sans-serif;
    font-weight:700;
    margin:0;
    letter-spacing:.03em;
  }
  .eyebrow{
    font-family:'JetBrains Mono', monospace;
    font-size:.72rem;
    letter-spacing:.18em;
    text-transform:uppercase;
    color:var(--steel);
    display:flex;
    align-items:center;
    gap:.6em;
  }
  .eyebrow::before{
    content:"";
    width:1.6em;
    height:1px;
    background:var(--steel);
    display:inline-block;
  }
  a{color:inherit;}
  img{max-width:100%;}

  /* ---------- layout helpers ---------- */
  .wrap{
    max-width:1120px;
    margin:0 auto;
    padding:0 32px;
  }
  section{
    padding:96px 0;
    border-bottom:1px solid var(--line);
    position:relative;
    isolation:isolate;
  }
  @media (max-width:720px){
    .wrap{padding:0 22px;}
    section{padding:64px 0;}
  }

  /* faint blueprint grid on paper sections */
  .grid-bg{
    background-image:
      linear-gradient(var(--line) 1px, transparent 1px),
      linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size:64px 64px;
    background-position:center top;
    opacity:1;
  }
  .grid-bg::before{
    content:"";
    position:absolute; inset:0;
    z-index:-1;
    background:linear-gradient(180deg, var(--paper) 0%, rgba(246,247,250,.55) 40%, var(--paper) 100%);
    pointer-events:none;
  }

  /* ---------- header ---------- */
  header{
    position:sticky; top:0; z-index:40;
    background:rgba(246,247,250,.92);
    backdrop-filter:blur(6px);
    border-bottom:1px solid var(--line);
  }
  .nav{
    display:flex; align-items:center; justify-content:space-between;
    padding:20px 32px;
    max-width:1120px; margin:0 auto;
  }
  .logo{
    font-family:'Shippori Mincho', serif;
    font-weight:800;
    font-size:1.15rem;
    letter-spacing:.06em;
    display:flex; align-items:center;
  }
  .logo-mark{height:34px; width:auto; display:block;}
  .nav-links{
    display:flex; gap:34px;
    font-family:'JetBrains Mono', monospace;
    font-size:.72rem;
    letter-spacing:.1em;
    text-transform:uppercase;
  }
  .nav-links a{
    text-decoration:none;
    padding-bottom:4px;
    border-bottom:1px solid transparent;
    transition:border-color .25s, color .25s;
  }
  .nav-links a:hover, .nav-links a:focus-visible{ border-color:var(--steel); color:var(--steel);}
  .nav-toggle{display:none;}
  @media (max-width:720px){
    .nav-links{
      position:fixed; inset:64px 0 auto 0;
      background:var(--paper);
      flex-direction:column; gap:0;
      border-bottom:1px solid var(--line);
      max-height:0; overflow:hidden;
      transition:max-height .3s ease;
    }
    .nav-links.open{max-height:320px;}
    .nav-links a{padding:16px 22px; border-bottom:1px solid var(--line); width:100%;}
    .nav-toggle{
      display:block; background:none; border:1px solid var(--ink);
      width:38px; height:32px; position:relative; cursor:pointer;
    }
    .nav-toggle span{
      position:absolute; left:8px; right:8px; height:1px; background:var(--ink);
    }
    .nav-toggle span:nth-child(1){top:11px;}
    .nav-toggle span:nth-child(2){top:16px;}
    .nav-toggle span:nth-child(3){top:21px;}
  }

  /* ---------- hero ---------- */
  .hero{
    padding-top:120px; padding-bottom:110px;
    overflow:hidden;
  }
  .hero .wrap{position:relative; z-index:1;}
  .hero h1{
    font-size:clamp(2.3rem, 5.4vw, 4.1rem);
    line-height:1.35;
    margin:26px 0 30px;
  }
  .hero h1 .accent{color:var(--steel);}
  .hero p.lead{
    max-width:560px;
    font-size:1.02rem;
    color:#495265;
  }
  .doc-frame{
    margin-top:56px;
    border:1px solid var(--line);
    display:grid;
    grid-template-columns:repeat(3, 1fr);
  }
  .doc-frame div{
    padding:20px 26px;
    border-right:1px solid var(--line);
  }
  .doc-frame div:last-child{border-right:none;}
  .doc-frame .k{
    font-family:'JetBrains Mono', monospace;
    font-size:.68rem;
    letter-spacing:.12em;
    text-transform:uppercase;
    color:var(--steel);
    display:block; margin-bottom:8px;
  }
  .doc-frame .v{font-size:.94rem;}
  .doc-frame .v.dim{color:#9aa2b0; font-size:.86rem;}
  .doc-frame.cols-4{margin-top:64px; grid-template-columns:repeat(4,1fr);}
  .doc-frame.cols-3{margin-top:64px; grid-template-columns:repeat(3,1fr);}
  .doc-frame.cols-2{margin-top:64px; grid-template-columns:repeat(2,1fr);}
  @media (max-width:900px){
    .doc-frame.cols-4{grid-template-columns:repeat(2,1fr);}
    .doc-frame.cols-3{grid-template-columns:repeat(2,1fr);}
  }
  @media (max-width:560px){
    .doc-frame.cols-4{grid-template-columns:1fr;}
    .doc-frame.cols-4 div{border-right:none; border-bottom:1px solid var(--line);}
    .doc-frame.cols-4 div:last-child{border-bottom:none;}
    .doc-frame.cols-3{grid-template-columns:1fr;}
    .doc-frame.cols-3 div{border-right:none; border-bottom:1px solid var(--line);}
    .doc-frame.cols-3 div:last-child{border-bottom:none;}
    .doc-frame.cols-2{grid-template-columns:1fr;}
    .doc-frame.cols-2 div{border-right:none; border-bottom:1px solid var(--line);}
    .doc-frame.cols-2 div:last-child{border-bottom:none;}
  }
  @media (max-width:720px){
    .doc-frame{grid-template-columns:1fr;}
    .doc-frame div{border-right:none; border-bottom:1px solid var(--line);}
    .doc-frame div:last-child{border-bottom:none;}
  }

  /* ---------- section headings ---------- */
  .s-head{
    display:flex; justify-content:space-between; align-items:flex-end;
    gap:24px; margin-bottom:52px; flex-wrap:wrap;
  }
  .s-head h1{font-size:clamp(1.55rem, 3vw, 2.1rem);}
  .s-num{
    font-family:'JetBrains Mono', monospace;
    font-size:.75rem; color:var(--concrete);
    letter-spacing:.08em;
  }

  /* ---------- 会社概要 ---------- */
  .lead-text{
    max-width:680px; font-size:1.02rem;
  }
  .about-grid{
    margin-top:56px;
    display:grid; grid-template-columns:1fr 1px 1fr; gap:0 48px;
  }
  .about-grid .divider{background:var(--line);}
  .about-grid h3{
    font-size:1.05rem; margin-bottom:16px; font-family:'Zen Kaku Gothic New', sans-serif; font-weight:700;
  }
  @media (max-width:720px){
    .about-grid{grid-template-columns:1fr; gap:36px;}
    .about-grid .divider{display:none;}
  }

  /* 理念リスト */
  .tenet-list{list-style:none; margin:0; padding:0;}
  .tenet-list li{
    display:flex; gap:18px;
    padding:20px 0;
    border-top:1px solid var(--line);
  }
  .tenet-list li:last-child{border-bottom:1px solid var(--line);}
  .tenet-mark{
    flex:0 0 auto;
    width:9px; height:9px;
    margin-top:9px;
    background:var(--steel);
    transform:rotate(45deg);
  }
  .tenet-text b{font-weight:700; font-family:'Zen Kaku Gothic New', sans-serif;}
  .tenet-text{font-size:.98rem;}

  /* ---------- 事業カード ---------- */
  .biz-cards{
    display:grid; grid-template-columns:1fr 1fr; gap:1px;
    background:var(--line);
    border:1px solid var(--line);
  }
  .biz-card{
    background:var(--paper);
    padding:40px 38px;
  }
  .biz-card .tag{
    font-family:'JetBrains Mono', monospace;
    font-size:.68rem; letter-spacing:.12em; text-transform:uppercase;
    color:var(--steel); display:block; margin-bottom:18px;
  }
  .biz-card h3{
    font-size:1.28rem; margin-bottom:16px; line-height:1.5;
  }
  .biz-card p{font-size:.95rem; color:#495265;}
  .node-diagram{
    margin-top:26px; height:64px; position:relative;
  }
  .node-diagram svg{width:100%; height:100%; display:block;}
  @media (max-width:720px){
    .biz-cards{grid-template-columns:1fr;}
  }
  .biz-cards.cols-3-cards{grid-template-columns:1fr 1fr 1fr;}
  @media (max-width:960px){
    .biz-cards.cols-3-cards{grid-template-columns:1fr;}
  }

  /* ---------- 運営方針 ---------- */
  .policy-table{
    margin-top:52px;
    border-top:1px solid var(--line);
  }
  .policy-row{
    display:grid; grid-template-columns:220px 1fr;
    border-bottom:1px solid var(--line);
    padding:22px 0;
    gap:20px;
  }
  .policy-row .term{
    font-family:'Zen Kaku Gothic New', sans-serif;
    font-weight:700; font-size:.98rem;
    color:var(--steel);
  }
  .policy-row .desc{font-size:.95rem;}
  @media (max-width:600px){
    .policy-row{grid-template-columns:1fr; gap:6px; padding:18px 0;}
  }

  /* ---------- 実績 ---------- */
  .col-label-solo{
    font-family:'JetBrains Mono', monospace;
    font-size:.7rem; letter-spacing:.14em; text-transform:uppercase;
    color:var(--steel);
    padding-bottom:12px; border-bottom:1px solid var(--line);
    margin-bottom:26px;
  }

  .feature-grid{display:grid; gap:24px;}
  .feature-card{
    display:grid; grid-template-columns:280px 1fr;
    border:1px solid var(--line);
  }
  .feature-card.empty{border-style:dashed;}
  .feature-photo{
    background:var(--paper-dim);
    display:flex; align-items:center; justify-content:center;
    min-height:180px;
  }
  .feature-photo span{
    font-family:'JetBrains Mono', monospace;
    font-size:.7rem; letter-spacing:.14em;
    color:var(--concrete);
  }
  .feature-body{padding:30px 34px; display:flex; flex-direction:column; justify-content:center;}
  .feature-body .tag{
    font-family:'JetBrains Mono', monospace;
    font-size:.66rem; letter-spacing:.1em; text-transform:uppercase;
    color:var(--steel); display:block; margin-bottom:12px;
  }
  .feature-body h3{font-size:1.1rem; margin-bottom:10px;}
  .feature-body p{font-size:.92rem; color:#495265; margin:0;}
  @media (max-width:700px){
    .feature-card{grid-template-columns:1fr;}
    .feature-photo{min-height:140px;}
  }

  .case-list{border-top:1px solid var(--line);}
  .case-list-row{
    padding:16px 4px;
    border-bottom:1px solid var(--line);
    font-size:.92rem;
    display:flex; justify-content:space-between; gap:16px;
  }
  .case-list-row.empty{color:#9aa2b0; font-family:'JetBrains Mono', monospace; font-size:.82rem;}

  /* ---------- お問い合わせフォーム ---------- */
  .contact-form{
    margin-top:56px;
    max-width:640px;
    border-top:1px solid var(--line);
    padding-top:44px;
  }
  .form-row{margin-bottom:22px;}
  .form-row-split{display:grid; grid-template-columns:1fr 1fr; gap:20px;}
  @media (max-width:600px){ .form-row-split{grid-template-columns:1fr;} }
  .contact-form label{
    display:block;
    font-family:'JetBrains Mono', monospace;
    font-size:.7rem; letter-spacing:.08em; text-transform:uppercase;
    color:var(--steel);
    margin-bottom:8px;
  }
  .contact-form input,
  .contact-form select,
  .contact-form textarea{
    width:100%;
    border:1px solid var(--line);
    background:var(--paper);
    padding:12px 14px;
    font-family:'Noto Sans JP', sans-serif;
    font-size:.95rem;
    color:var(--ink);
  }
  .contact-form input:focus,
  .contact-form select:focus,
  .contact-form textarea:focus{
    outline:none; border-color:var(--steel);
  }
  .contact-form textarea{resize:vertical;}
  .form-submit{
    background:var(--navy);
    color:#fff;
    border:none;
    padding:14px 32px;
    font-family:'JetBrains Mono', monospace;
    font-size:.8rem; letter-spacing:.1em; text-transform:uppercase;
    cursor:pointer;
  }
  .form-submit:hover{background:var(--steel);}
  .form-note{
    margin-top:14px; font-size:.8rem; color:#7a8296;
  }

  /* ---------- footer ---------- */
  footer{
    padding:56px 0 40px;
    background:var(--paper-dim);
  }
  .foot-grid{
    display:flex; justify-content:space-between; align-items:flex-end; flex-wrap:wrap; gap:24px;
  }
  .foot-logo{font-family:'Zen Kaku Gothic New', sans-serif; font-weight:700; font-size:1rem; display:flex; align-items:center; gap:12px;}
  .foot-logo img{height:26px; width:auto; display:block;}
  .foot-meta{
    font-family:'JetBrains Mono', monospace;
    font-size:.7rem; letter-spacing:.06em; color:#7a8296;
  }

  /* reveal on scroll */
  .reveal{opacity:0; transform:translateY(16px); transition:opacity .7s ease, transform .7s ease;}
  .reveal.in{opacity:1; transform:none;}
  @media (prefers-reduced-motion: reduce){
    .reveal{opacity:1; transform:none; transition:none;}
    html{scroll-behavior:auto;}
  }