/* ---- tech fields (work01 prototype) ---- */
  .tf-tabs{ position:sticky; top:64px; z-index:40; background:rgba(245,243,238,.92); backdrop-filter:blur(10px); border-bottom:1px solid var(--paper-line); }
  .tf-tabs .wrap{ display:flex; gap:8px; overflow-x:auto; padding-top:12px; padding-bottom:12px; }
  .tf-tabs a{ display:flex; align-items:center; gap:10px; padding:10px 18px; border:1px solid var(--paper-line); background:#fff; font-size:.88rem; font-weight:600; color:var(--navy); white-space:nowrap; transition:all .3s var(--ease); }
  .tf-tabs a svg{ width:20px; height:20px; stroke:var(--copper); fill:none; stroke-width:2; }
  .tf-tabs a:hover, .tf-tabs a.on{ background:var(--navy); color:#fff; border-color:var(--navy); }
  .tf-field{ scroll-margin-top:130px; }
  .tf-field:nth-of-type(even){ background:#fff; border-top:1px solid var(--paper-line); border-bottom:1px solid var(--paper-line); }
  .tf-fhead{ display:grid; grid-template-columns:1fr 340px; gap:56px; align-items:end; margin-bottom:48px; }
  .tf-fnum{ font-family:var(--f-head); font-size:clamp(4rem,9vw,7rem); line-height:1; color:transparent; -webkit-text-stroke:1px var(--copper); display:block; margin-bottom:8px; }
  .tf-fhead h2{ font-size:clamp(2rem,4vw,3rem); color:var(--navy); line-height:1.3; }
  .tf-fhead .tf-line{ width:64px; height:2px; background:var(--copper); margin-top:22px; }
  .tf-lead{ font-family:var(--f-head); font-size:clamp(1.1rem,1.8vw,1.35rem); line-height:2; color:var(--navy); margin-top:20px; max-width:34em; }
  .tf-video{ position:relative; aspect-ratio:21/8; overflow:hidden; margin:0 0 56px; background:var(--navy); }
  .tf-video video{ width:100%; height:100%; object-fit:cover; display:block; }
  .tf-video::after{ content:""; position:absolute; inset:0; background:linear-gradient(90deg, rgba(14,27,51,.55), transparent 55%); pointer-events:none; }
  .tf-prose{ max-width:44em; }
  .tf-prose p{ font-size:1rem; line-height:2.05; color:var(--ink); margin-bottom:1.5em; }
  .tf-prose p:first-child{ font-family:var(--f-head); font-size:1.2rem; line-height:2; color:var(--navy); }
  .tf-prose strong, .tf-app strong, .tf-sys strong{ color:var(--navy); font-weight:700; background:linear-gradient(transparent 64%, rgba(233,192,140,.55) 64%); }
  .tf-prose a, .tf-app a{ color:var(--blue); border-bottom:1px solid currentColor; }
  .tf-apps-label{ display:flex; align-items:center; gap:14px; margin:88px 0 36px; font-size:.8rem; letter-spacing:.14em; color:var(--copper-deep); font-weight:700; }
  .tf-apps-label::after{ content:""; flex:1; height:1px; background:var(--paper-line); }
  .tf-app{ display:grid; grid-template-columns:5fr 7fr; gap:48px; align-items:start; padding:40px 0; border-top:1px solid var(--paper-line); }
  .tf-app:nth-child(even){ grid-template-columns:7fr 5fr; }
  .tf-app:nth-child(even) .tf-app-media{ order:2; }
  .tf-app-media{ position:relative; aspect-ratio:4/3; overflow:hidden; background:var(--navy); }
  .tf-app-media video{ width:100%; height:100%; object-fit:cover; display:block; }
  .tf-app-media span{ position:absolute; left:14px; top:12px; font-family:var(--f-head); font-size:2.4rem; color:#fff; line-height:1; text-shadow:0 2px 12px rgba(0,0,0,.4); }
  .tf-app h3{ font-size:1.35rem; color:var(--navy); line-height:1.6; margin-bottom:18px; }
  .tf-app p{ font-size:.96rem; line-height:2; margin-bottom:1.2em; }
  .tf-sys-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; margin:8px 0 40px; }
  .tf-sys{ background:var(--paper); border:1px solid var(--paper-line); padding:0 0 24px; transition:transform .4s var(--ease), box-shadow .4s var(--ease); }
  .tf-field:nth-of-type(odd) .tf-sys{ background:#fff; }
  .tf-sys:hover{ transform:translateY(-4px); box-shadow:0 18px 40px -24px rgba(14,27,51,.35); }
  .tf-sys .tf-vis{ margin-bottom:20px; aspect-ratio:16/9; }
  .tf-sys p{ padding:0 22px; font-size:.9rem; line-height:1.9; color:var(--muted); }
  .tf-sys p strong{ display:block; font-size:1.02rem; margin-bottom:8px; background:none; color:var(--navy); }
  /* visuals: icon / photo placeholder */
  .tf-vis{ position:relative; aspect-ratio:4/3; overflow:hidden; }
  .tf-ic{ position:absolute; inset:0; display:flex; align-items:center; justify-content:center; background:var(--navy);
          background-image:linear-gradient(rgba(158,180,216,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(158,180,216,.08) 1px,transparent 1px); background-size:28px 28px; }
  .tf-ic svg{ width:42%; height:auto; stroke:var(--copper-soft); fill:none; stroke-width:1.4; stroke-linecap:round; stroke-linejoin:round; }
  .tf-ph{ position:absolute; inset:0; display:flex; flex-direction:column; gap:10px; align-items:center; justify-content:center; text-align:center; padding:12px;
          background:repeating-linear-gradient(-45deg,#EDEAE2 0 12px,#F5F3EE 12px 24px); border:1px dashed #CFC8B6; color:var(--muted); font-size:.78rem; }
  .tf-ph svg{ width:34px; height:34px; stroke:var(--muted); fill:none; stroke-width:1.5; }
  body.vis-icon .tf-ph{ display:none; } body.vis-photo .tf-ic{ display:none; }
  /* entry cards */
  .tf-cards{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
  .tf-card{ display:flex; flex-direction:column; background:#fff; border:1px solid var(--paper-line); transition:transform .5s var(--ease), box-shadow .5s var(--ease), border-color .5s; }
  .tf-card:hover{ transform:translateY(-6px); box-shadow:0 30px 60px -30px rgba(14,27,51,.45); border-color:var(--copper-soft); }
  .tf-card-body{ padding:26px 26px 28px; display:flex; flex-direction:column; flex:1; }
  .tf-card-num{ font-family:var(--f-head); color:var(--copper); font-size:.95rem; letter-spacing:.1em; }
  .tf-card h3{ font-size:1.5rem; color:var(--navy); margin:6px 0 14px; }
  .tf-card ul{ list-style:none; margin-bottom:18px; }
  .tf-card li{ font-size:.84rem; color:var(--muted); padding:7px 0; border-top:1px dashed var(--paper-line); }
  .tf-card .tf-sum{ font-size:.92rem; line-height:1.9; color:var(--ink); margin-bottom:16px; }
  .tf-tags{ display:flex; flex-wrap:wrap; gap:6px; margin-bottom:18px; }
  .tf-tags span{ font-size:.72rem; padding:4px 10px; background:var(--paper); border:1px solid var(--paper-line); color:var(--navy); }
  .tf-more{ margin-top:auto; display:flex; align-items:center; justify-content:space-between; font-size:.85rem; font-weight:700; color:var(--navy); padding-top:14px; border-top:1px solid var(--paper-line); }
  .tf-more i{ font-style:normal; width:34px; height:34px; border-radius:50%; display:flex; align-items:center; justify-content:center; background:var(--navy); color:#fff; transition:transform .4s var(--ease), background .4s; }
  .tf-card:hover .tf-more i{ transform:translateX(4px); background:var(--copper); }
  /* summary version */
  .tf-points{ display:grid; grid-template-columns:repeat(3,1fr); gap:0; border:1px solid var(--paper-line); background:#fff; margin-bottom:72px; }
  .tf-point{ padding:30px 28px; border-right:1px solid var(--paper-line); }
  .tf-point:last-child{ border-right:none; }
  .tf-point b{ display:block; font-family:var(--f-head); font-size:2rem; color:var(--copper); line-height:1; margin-bottom:14px; }
  .tf-point h4{ font-size:1.05rem; color:var(--navy); margin-bottom:10px; }
  .tf-point p{ font-size:.88rem; line-height:1.9; color:var(--muted); }
  .tf-label{ display:inline-block; font-size:.72rem; font-weight:700; letter-spacing:.14em; color:#fff; background:var(--navy); padding:5px 12px; margin-bottom:16px; }
  .tf-lang{ display:flex; gap:12px; flex-wrap:wrap; margin:10px 0 64px; }
  .tf-lang div{ flex:1; min-width:150px; padding:22px; background:var(--navy); color:#fff; }
  .tf-lang div b{ font-family:var(--f-en); font-size:1.8rem; color:var(--copper-soft); display:block; line-height:1.1; }
  .tf-lang div small{ font-size:.78rem; color:var(--muted-on-navy); }
  .tf-app .tf-tags{ margin-top:6px; }
  details.tf-full{ margin-top:72px; border-top:2px solid var(--navy); }
  details.tf-full summary{ cursor:pointer; list-style:none; display:flex; justify-content:space-between; align-items:center; padding:22px 0; font-weight:700; color:var(--navy); }
  details.tf-full summary::-webkit-details-marker{ display:none; }
  details.tf-full summary::after{ content:"＋"; font-size:1.2rem; color:var(--copper); }
  details.tf-full[open] summary::after{ content:"－"; }
  details.tf-full .tf-prose{ padding-bottom:20px; }
  .tf-related{ display:grid; grid-template-columns:1fr 1fr; gap:20px; }
  .tf-related a{ display:flex; align-items:center; gap:18px; padding:22px 24px; background:var(--navy); color:#fff; transition:background .3s; }
  .tf-related a:hover{ background:var(--navy-soft); }
  .tf-related a svg{ width:40px; height:40px; stroke:var(--copper-soft); fill:none; stroke-width:1.4; flex-shrink:0; }
  .tf-related a b{ font-family:var(--f-head); font-size:1.15rem; flex:1; }
  .tf-subnav{ padding:48px 0; } .tf-subnav ul{ list-style:none; display:flex; flex-wrap:wrap; gap:10px 28px; font-size:.85rem; }
  .tf-subnav a{ color:var(--muted); } .tf-subnav a:hover{ color:var(--navy); }
  .tf-proto-x{ position:fixed; right:16px; bottom:16px; z-index:99; background:var(--navy-deep); color:#fff; font-size:.72rem; padding:8px 12px; opacity:.9; }
  .tf-proto-x a{ color:var(--copper-soft); margin-left:8px; border-bottom:1px solid; }
  @media (max-width:900px){
    .tf-fhead{ grid-template-columns:1fr; gap:28px; } .tf-fhead .tf-vis{ display:none; }
    .tf-app, .tf-app:nth-child(even){ grid-template-columns:1fr; gap:22px; } .tf-app:nth-child(even) .tf-app-media{ order:0; }
    .tf-sys-grid, .tf-cards, .tf-points, .tf-related{ grid-template-columns:1fr; }
    .tf-point{ border-right:none; border-bottom:1px solid var(--paper-line); }
    .tf-video{ aspect-ratio:16/9; }
  }
body.vis-icon .tf-ph{display:none}
/* 3.0.0：専用ブロックで写真を選んだとき（アイコンの代わりに写真） */
.tf-vis.has-photo .tf-photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block;max-width:none}