:root{
    --navy:#121212;
    --navy-soft:#333333;
    --red:#e0322d;
    --ink:#1a1a1a;
    --text:#42506b;
    --muted:#93a4c4;
    --muted-2:#aab7d1;
    --line:#dbe2ec;
    --bg:#ffffff;
    --bg-gray:#f4f6f9;
    --maxw:1400px;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{
    font-family:"Noto Sans JP","Hiragino Kaku Gothic ProN",sans-serif;
    color:var(--text);background:var(--bg);line-height:1.9;
    -webkit-font-smoothing:antialiased;overflow-x:hidden;
  }
  img{max-width:100%;display:block}
  a{color:inherit;text-decoration:none}
  .en{font-family:"Barlow",sans-serif;letter-spacing:.18em}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 48px}

  .kick{font-family:"Barlow",sans-serif;font-size:12px;letter-spacing:.24em;color:var(--muted);font-weight:600}
  .kick::after{content:"";display:block;width:28px;height:2px;background:var(--muted);opacity:.55;margin-top:14px}

  .btn{display:inline-flex;align-items:center;gap:16px;padding:15px 28px;font-size:13px;font-weight:700;border:1px solid var(--navy);transition:.2s;font-family:inherit}
  .btn.solid{background:var(--navy);color:#fff}
  .btn.solid:hover{background:var(--navy-soft)}
  .btn.ghost{color:var(--navy)}
  .btn.ghost:hover{background:var(--navy);color:#fff}
  .btn.lg{padding:24px 40px;font-size:15px;gap:22px}

  /* ---------- header ---------- */
  header{
    position:fixed;top:0;left:0;right:0;z-index:100;
    background:rgba(255,255,255,.9);
    backdrop-filter:blur(10px);
    border-bottom:1px solid rgba(215,222,231,.6);
  }
  .nav{
    max-width:var(--maxw);margin:0 auto;
    display:flex;align-items:center;gap:40px;
    padding:18px 48px;
  }
  .logo{display:inline-flex;align-items:center}
  .logo svg{height:30px;width:auto;flex:none}
  .nav-links{display:flex;gap:34px;margin-left:20px}
  .nav-links a{font-size:14px;font-weight:500;color:var(--ink);transition:color .2s}
  .nav-links a:hover{color:var(--red)}
  .nav-cta{margin-left:auto;display:flex;gap:14px}
  .nav-cta .btn{padding:14px 26px;font-size:13px;gap:14px}
  .burger{display:none;margin-left:auto;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
  .burger span{width:26px;height:2px;background:var(--ink)}
  .nav-item{position:static}
  .nav-item > a{font-size:14px;font-weight:500;color:var(--ink);transition:color .2s;padding:16px 0;display:inline-flex;align-items:center;gap:7px;position:relative}
  .nav-item > a:hover{color:var(--red)}
  .nav-item.has-drop > a::after{content:"";width:6px;height:6px;border-right:1.5px solid var(--muted);border-bottom:1.5px solid var(--muted);transform:rotate(45deg) translateY(-2px);transition:.2s}
  .nav-item.has-drop:hover > a{color:var(--red);font-weight:700}
  .nav-item.has-drop:hover > a::after{border-color:var(--red)}
  .nav-item.has-drop:hover > a::before{content:"";position:absolute;left:0;right:13px;bottom:9px;height:2px;background:var(--red)}
  .mega{position:absolute;left:0;right:0;top:100%;background:var(--bg-gray);border-top:1px solid var(--line);box-shadow:0 34px 60px -34px rgba(20,35,63,.28);z-index:120;opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .2s ease,transform .2s ease,visibility .2s}
  .mega::before{content:"";position:absolute;left:0;right:0;top:-26px;height:26px}
  .nav-item.has-drop:hover .mega{opacity:1;visibility:visible;transform:translateY(0)}
  .mega-inner{max-width:var(--maxw);margin:0 auto;padding:46px 48px 52px}
  .mega-grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
  .mcard{position:relative;aspect-ratio:2/1;overflow:hidden;background:var(--navy);display:block}
  .mcard img{width:100%;height:100%;object-fit:cover;opacity:.7;transition:.3s}
  .mcard::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,35,63,.12),rgba(20,35,63,.78))}
  .mcard:hover img{opacity:.55;transform:scale(1.04)}
  .mcard .t{position:absolute;left:22px;bottom:22px;z-index:2;color:#fff;font-size:17px;font-weight:700;letter-spacing:.04em}
  .mcard .go{position:absolute;right:18px;bottom:16px;z-index:2;width:36px;height:36px;border:1px solid rgba(255,255,255,.55);border-radius:50%;display:grid;place-items:center;color:#fff;font-size:13px;transition:.2s}
  .mcard:hover .go{background:#fff;color:var(--navy);border-color:#fff}
  .msrow{display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:start}
  .mslabel{font-family:"Barlow";font-size:12px;letter-spacing:.24em;color:var(--muted);font-weight:600;margin-bottom:18px}
  .mslist{display:flex;flex-direction:column}
  .msitem{display:grid;grid-template-columns:auto 1fr auto;gap:22px;align-items:center;padding:17px 8px;border-top:1px solid var(--line);transition:background .15s}
  .mslist .msitem:last-child{border-bottom:1px solid var(--line)}
  .msitem:hover,.msitem.is-active{background:#fff}
  .msitem.is-active .ar{transform:translateX(4px)}
  .msitem .ar{transition:transform .15s;color:var(--navy);font-size:15px}
  .msitem .n{font-family:"Barlow";font-size:21px;font-weight:300;color:var(--navy);border-right:1px solid var(--line);padding-right:22px}
  .msitem .tx b{display:block;font-size:16px;font-weight:700;color:var(--navy);margin-bottom:3px}
  .msitem .tx em{font-style:normal;font-size:12px;color:var(--muted)}
  .msfeat{overflow:hidden}
  .msfeat img{width:100%;height:300px;object-fit:cover;margin-bottom:18px;transition:opacity .18s ease,transform .55s cubic-bezier(.2,.6,.2,1)}
  .msrow:hover .msfeat img{transform:scale(1.06)}
  .msfeat .fh{display:flex;align-items:baseline;gap:16px;margin-bottom:10px}
  .msfeat .fh .n{font-family:"Barlow";font-size:13px;letter-spacing:.12em;color:var(--muted)}
  .msfeat .fh h4{font-size:16px;font-weight:700;color:var(--navy)}
  .msfeat p{font-size:12.5px;color:var(--text);line-height:1.9}
  .msfeat .more{display:inline-flex;align-items:center;gap:14px;margin-top:16px;font-size:13px;font-weight:700;color:var(--navy)}

  .mmenu{display:none;position:fixed;inset:0;z-index:99;background:#fff;padding:100px 28px 40px;flex-direction:column;gap:8px}
  .mmenu.open{display:flex}
  .mmenu a{padding:16px 0;border-bottom:1px solid var(--line);font-weight:500;color:var(--ink)}
  .mmenu .btn{margin-top:20px;justify-content:center}
  /* ---------- blog hero ---------- */
  .bhero{padding-top:132px;position:relative;overflow:hidden;
    background:radial-gradient(150% 120% at 100% 0%,rgba(18,18,18,.05),transparent 52%),linear-gradient(180deg,#fff 0%,#f5f7fb 100%)}
  .bhero .wrap{position:relative;z-index:2}
  .crumb{display:flex;align-items:center;gap:14px;font-size:12.5px;color:var(--muted);padding:26px 0 30px}
  .crumb .cur{color:var(--muted-2)}
  .bhero-top{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:56px;align-items:end;padding-bottom:52px;border-bottom:1px solid var(--line)}
  .bhero-top .kick{margin-bottom:20px}
  .bhero-top h1{font-size:clamp(34px,3.4vw,50px);font-weight:900;color:var(--navy);line-height:1.18;letter-spacing:.02em}
  .bhero-lead{border-left:1px solid var(--line);padding-left:26px;font-size:14px;color:var(--text)}
  .bhero-lead .en{display:block;margin-top:18px;font-size:11px;letter-spacing:.2em;color:var(--muted);line-height:2}

  /* ---------- case studies: shared ---------- */
  /* 事例詳細のヘッダー（キービジュアル画像なし・パンくずのみ） */
  .cd-head{padding-top:132px;border-bottom:1px solid var(--line);
    background:radial-gradient(150% 120% at 100% 0%,rgba(18,18,18,.05),transparent 52%),linear-gradient(180deg,#fff 0%,#f5f7fb 100%)}

  .cscard{position:relative;isolation:isolate;overflow:hidden;display:flex;flex-direction:column;justify-content:flex-end;
    min-height:360px;padding:32px 28px;background:var(--navy)}
  .cscard .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2;opacity:.75;
    transition:transform .65s cubic-bezier(.2,.6,.2,1)}
  .cscard::after{content:"";position:absolute;inset:0;z-index:-1;
    background:linear-gradient(180deg,rgba(18,18,18,.1) 0%,rgba(18,18,18,.5) 55%,rgba(18,18,18,.88) 100%)}
  .cscard:hover .bg{transform:scale(1.06)}
  .cscard .ind{font-family:"Barlow";font-size:10px;font-weight:600;letter-spacing:.16em;color:rgba(255,255,255,.7);
    display:flex;align-items:center;gap:11px;margin-bottom:16px}
  .cscard .ind::before{content:"";width:20px;height:2px;background:var(--red)}
  .cscard .ind .jp{font-family:"Noto Sans JP",sans-serif;font-size:11px;letter-spacing:.08em;color:#fff;font-weight:700}
  .cscard h3{font-size:17px;font-weight:900;color:#fff;line-height:1.6;margin-bottom:10px}
  .cscard p{font-size:12.5px;color:rgba(255,255,255,.82);line-height:1.85;
    display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  .cscard .more{margin-top:16px;display:inline-flex;align-items:center;gap:12px;font-size:12px;font-weight:700;color:#fff}

  @media(max-width:900px){
  }

  /* ---------- case studies: detail ---------- */
  .cd-top{padding:64px 0 10px}
  .cd-top .ind{font-family:"Barlow";font-size:11px;font-weight:600;letter-spacing:.18em;color:var(--muted);
    display:flex;align-items:center;gap:11px;margin-bottom:18px}
  .cd-top .ind::before{content:"";width:24px;height:2px;background:var(--red)}
  .cd-top .ind .jp{font-family:"Noto Sans JP",sans-serif;font-size:12px;letter-spacing:.06em;color:var(--navy);font-weight:700}
  .cd-top h1{font-size:clamp(28px,3.4vw,44px);font-weight:900;color:var(--navy);line-height:1.5;letter-spacing:.02em;margin-bottom:24px}
  .cd-summary{font-size:15px;color:var(--text);line-height:2;max-width:780px}

  .cd-ba{display:grid;grid-template-columns:1fr 64px 1fr;margin:60px 0 10px;border:1px solid var(--line)}
  .cd-ba .col{padding:34px 32px}
  .cd-ba .t{font-family:"Barlow";font-size:12px;letter-spacing:.2em;color:var(--muted);margin-bottom:18px;display:block}
  .cd-ba .col.after .t{color:var(--navy)}
  .cd-ba ul{list-style:none;margin:0;padding:0}
  .cd-ba li{padding:11px 0;border-top:1px solid var(--line);font-size:13px;color:var(--text)}
  .cd-ba li:first-child{border-top:0}
  .cd-ba .mid{display:flex;align-items:center;justify-content:center;color:var(--muted-2);font-size:20px;background:var(--bg-gray)}

  .cd-block{padding:50px 0;border-top:1px solid var(--line)}
  .cd-block .lb{font-family:"Barlow";font-size:12px;font-weight:700;letter-spacing:.2em;color:var(--muted);margin-bottom:18px}
  .cd-block h2{font-size:23px;font-weight:900;color:var(--navy);margin-bottom:20px}
  .cd-block > p{font-size:14px;color:var(--text);line-height:2.05;max-width:780px}

  .cd-results{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin:26px 0}
  .cd-result{background:#fff;padding:34px 26px;text-align:center}
  .cd-result .n{font-family:"Barlow";font-size:clamp(28px,3vw,40px);font-weight:300;color:var(--navy)}
  .cd-result .n .u{font-size:15px;font-weight:600;margin-left:3px}
  .cd-result .l{font-size:12.5px;color:var(--muted);margin-top:10px}

  /* 技術的な記載：技術タグ・技術構成・設計・技術的な工夫・導入の流れ */
  .cd-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px;max-width:900px}
  .cd-tags span{font-family:"Barlow","Noto Sans JP",sans-serif;font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--navy);border:1px solid var(--line);background:var(--bg-gray);padding:5px 12px}
  .cd-tags + .cd-block{margin-top:48px}

  /* システム構成図（SVG）：狭い画面では横スクロールで読めるようにする */
  .cd-diagram{margin:6px 0 0}
  .cd-assumed{display:inline-block;vertical-align:middle;margin-left:12px;font-size:11px;font-weight:700;color:var(--red);border:1px solid var(--red);padding:2px 8px;letter-spacing:.08em}
  .cd-diagram .sc{border:1px solid var(--line);background:#fff;padding:24px;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .cd-diagram img{display:block;width:100%;min-width:760px;height:auto}
  .cd-diagram .sc-hint{display:none;font-size:11.5px;color:var(--muted);margin-top:8px;text-align:center}
  .cd-diagram figcaption{font-size:12.5px;color:var(--muted);line-height:1.9;margin-top:14px;max-width:900px}

  /* 処理の流れ（横並びのフロー。スマホでは縦並び） */
  .cd-pipe{list-style:none;margin:6px 0 0;padding:0;display:grid;grid-auto-flow:column;grid-auto-columns:minmax(0,1fr);gap:34px}
  .cd-pipe li{position:relative;border:1px solid var(--line);background:#fff;padding:18px 16px 20px;border-top:3px solid var(--muted-2)}
  .cd-pipe li + li::before{content:"→";position:absolute;left:-26px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:16px}
  .cd-pipe .no{display:block;font-family:"Barlow";font-size:12px;letter-spacing:.12em;color:var(--muted)}
  .cd-pipe .t{display:block;font-size:14.5px;font-weight:900;color:var(--navy);margin:6px 0 8px;line-height:1.5}
  .cd-pipe .d{display:block;font-size:12.5px;color:var(--text);line-height:1.8}
  .cd-pipe li.k-user{border-top-color:var(--muted-2);background:var(--bg-gray)}
  .cd-pipe li.k-sys{border-top-color:var(--navy-soft)}
  .cd-pipe li.k-api{border-top-color:var(--navy);border-style:dashed solid solid}
  .cd-pipe li.k-ai{border-top-color:var(--red)}
  .cd-pipe li.k-out{background:var(--navy);border-color:var(--navy)}
  .cd-pipe li.k-out .t{color:#fff}
  .cd-pipe li.k-out .d,.cd-pipe li.k-out .no{color:#c9d2e3}
  .cd-pipe-legend{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:18px;font-size:12px;color:var(--muted)}
  .cd-pipe-legend span::before{content:"";display:inline-block;width:18px;height:3px;margin-right:8px;vertical-align:middle;background:var(--muted-2)}
  .cd-pipe-legend .k-sys::before{background:var(--navy-soft)}
  .cd-pipe-legend .k-api::before{background:none;height:0;border-top:2px dashed var(--navy)}
  .cd-pipe-legend .k-ai::before{background:var(--red)}
  @media(max-width:900px){
    .cd-diagram .sc{padding:14px}
    .cd-pipe{grid-auto-flow:row;grid-auto-columns:auto;gap:30px}
    .cd-pipe li + li::before{content:"↓";left:50%;top:-29px;transform:translateX(-50%)}
    .cd-diagram .sc-hint{display:block}
  }
  .cd-stack{margin:6px 0 0;border-top:1px solid var(--navy)}
  .cd-stack .row{display:grid;grid-template-columns:200px minmax(0,1fr);gap:30px;padding:18px 4px;border-bottom:1px solid var(--line)}
  .cd-stack dt{font-size:13.5px;font-weight:700;color:var(--navy)}
  .cd-stack dd{margin:0;font-size:13.5px;color:var(--text);line-height:1.9}
  .cd-steps,.cd-flow{list-style:none;margin:0;padding:0;counter-reset:st}
  .cd-steps li,.cd-flow li{counter-increment:st;position:relative;padding:14px 0 14px 52px;border-bottom:1px solid var(--line);font-size:13.5px;color:var(--text);line-height:1.9}
  .cd-steps li:first-child,.cd-flow li:first-child{border-top:1px solid var(--line)}
  .cd-steps li::before,.cd-flow li::before{content:counter(st,decimal-leading-zero);position:absolute;left:4px;top:14px;font-family:"Barlow";font-size:15px;color:var(--muted)}
  .cd-flow{margin-top:24px}
  .cd-points{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line)}
  .cd-points .pt{background:#fff;padding:30px 28px}
  .cd-points .no{font-family:"Barlow";font-size:13px;color:var(--muted);letter-spacing:.12em}
  .cd-points h3{font-size:16.5px;font-weight:900;color:var(--navy);margin:8px 0 12px;line-height:1.6}
  .cd-points p{font-size:13px;color:var(--text);line-height:1.95}
  @media(max-width:900px){
    .cd-stack .row{grid-template-columns:1fr;gap:6px}
    .cd-points{grid-template-columns:1fr}
  }

  .cd-voice{background:var(--bg-gray);padding:48px 44px;margin-top:28px;position:relative}
  .cd-voice::before{content:"\201C";position:absolute;top:2px;left:28px;font-size:60px;color:var(--line);font-family:Georgia,serif}
  .cd-voice p{font-size:16px;font-weight:700;color:var(--navy);line-height:1.9;position:relative;z-index:2}
  .cd-voice .role{margin-top:18px;font-size:12.5px;color:var(--muted)}

  .cd-more{padding:70px 0 100px}
  .cd-more .lb2{font-family:"Barlow";font-size:12px;font-weight:700;letter-spacing:.2em;color:var(--muted);margin-bottom:26px}
  .cd-more-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}

  .cd-cta{background:var(--navy);padding:90px 0;text-align:center}
  .cd-cta .kick{color:rgba(255,255,255,.7);justify-content:center;display:flex}
  .cd-cta .kick::after{margin-left:auto;margin-right:auto;background:rgba(255,255,255,.5)}
  .cd-cta h2{font-size:clamp(24px,3vw,36px);font-weight:900;color:#fff;margin:22px 0 34px;line-height:1.6}
  .cd-cta .btn{background:#fff;color:var(--navy);border-color:#fff}
  .cd-cta .btn:hover{background:transparent;color:#fff}

  #notfound{padding:140px 0;text-align:center}
  #notfound h1{font-size:28px;font-weight:900;color:var(--navy);margin-bottom:20px}
  #notfound p{font-size:14px;color:var(--muted);margin-bottom:34px}

  @media(max-width:900px){
    .cd-ba{grid-template-columns:1fr}
    .cd-ba .mid{padding:14px 0;transform:rotate(90deg)}
    .cd-results{grid-template-columns:1fr}
    .cd-more-grid{grid-template-columns:1fr}
  }

  /* ---------- footer ---------- */
  footer{border-top:2px solid var(--navy);padding:72px 0 36px}
  .foot-grid{max-width:var(--maxw);margin:0 auto;padding:0 48px;display:grid;grid-template-columns:1fr 1fr;gap:60px}
  .foot-brand .logo{margin-bottom:30px}
  .foot-brand .logo svg{height:40px}
  .foot-brand h3{font-size:30px;font-weight:900;color:var(--navy);letter-spacing:.06em;margin-bottom:12px}
  .foot-brand p{font-size:13.5px;color:var(--text);margin-bottom:36px}
  .arrow-link{display:inline-flex;align-items:center;gap:18px;font-weight:700;color:var(--navy);font-size:15px;transition:gap .25s}
  .arrow-link:hover{gap:26px}
  .foot-nav{border-left:1px solid var(--line);padding-left:60px}
  .foot-nav ul{list-style:none;display:grid;grid-template-columns:repeat(4,auto);gap:20px 44px;margin-bottom:40px}
  .foot-nav ul a{font-size:13px;font-weight:500;color:var(--ink)}
  .foot-nav ul a:hover{color:var(--red)}
  .foot-bottom{max-width:var(--maxw);margin:40px auto 0;padding:24px 48px 0;border-top:1px solid var(--line);display:flex;align-items:center;gap:30px;font-size:11px;color:var(--muted);font-family:"Barlow";letter-spacing:.12em}
  .iso-badge{height:80px;width:auto;display:block}
  .foot-bottom .pp{border-left:1px solid var(--line);padding-left:30px;color:var(--ink)}

  /* ---------- motion ---------- */
  body{animation:pgin .5s ease both}
  @keyframes pgin{from{opacity:0}to{opacity:1}}
  .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1)}
  .reveal.in{opacity:1;transform:none}
  .reveal:nth-child(2){transition-delay:.05s}
  .reveal:nth-child(3){transition-delay:.1s}
  .reveal:nth-child(4){transition-delay:.15s}
  .reveal:nth-child(5){transition-delay:.2s}
  .reveal:nth-child(6){transition-delay:.25s}
  @media(prefers-reduced-motion:reduce){
    body{animation:none}
    .reveal{opacity:1;transform:none;transition:none}
  }
  /* typing reveal for big titles */
  .ty{visibility:hidden}
  .ty.ty-init{visibility:visible}
  .ty .ty-c{opacity:0}
  .ty .ty-c.on{opacity:1;transition:opacity .1s linear}
  .ty .ty-caret{display:inline-block;width:3px;height:.92em;background:var(--red);border-radius:1px;margin:0 .04em -.03em .07em;animation:tycaret .78s steps(1,end) infinite}
  @keyframes tycaret{0%,49%{opacity:1}50%,100%{opacity:0}}
  .ty.ty-done .ty-caret{opacity:0;animation:none;transition:opacity .35s ease}
  @media(prefers-reduced-motion:reduce){
    .ty{visibility:visible}
    .ty .ty-c{opacity:1}
    .ty .ty-caret{display:none}
  }

/* ---------- スマホ対応の追加調整 ---------- */
@media(max-width:900px){
  /* 帯ごと回転すると本文に重なるため、矢印部分だけの正方形にする */
  .cd-ba .mid{width:44px;height:44px;margin:0 auto;padding:0}
}