/* ============================================================
   LINKS ASSET — shared design system
   重厚・信頼感（大手ゼネコン風） / Navy + Teal
   ============================================================ */

/* ---- Fonts ---- */
@import url('https://fonts.googleapis.com/css2?family=Shippori+Mincho:wght@500;600;700;800&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

/* ---- Tokens ---- */
:root{
  --navy-900:#0a1f33;
  --navy-800:#102a43;
  --navy-700:#1b3a57;
  --navy-600:#27496b;
  --navy-500:#3a5d80;
  --teal:#1f7790;          /* AA: 5.1:1 on #fff */
  --teal-600:#185f74;
  --teal-300:#7bbccb;
  --teal-100:#e4f0f3;
  --teal-bright:#2b8ca5;    /* decorative only (lines/rules), never small text */
  --gold:#8a6a1e;           /* AA: 5.0:1 with #fff text */
  --ink:#16202b;
  --ink-70:#3d4a57;
  --ink-50:#697682;
  --ink-30:#9aa6b1;
  --paper:#ffffff;
  --mist:#f4f6f8;
  --mist-2:#eaeef2;
  --line:#dde3e9;
  --line-2:#eceff3;

  --maxw:1240px;
  --gut:clamp(20px,5vw,64px);
  --header-h:78px;

  --serif:"Shippori Mincho",serif;
  --sans:"Noto Sans JP",sans-serif;

  --ease:cubic-bezier(.16,.84,.44,1);
  --shadow-sm:0 2px 10px rgba(16,42,67,.06);
  --shadow-md:0 14px 40px rgba(16,42,67,.12);
  --shadow-lg:0 30px 70px rgba(10,31,51,.20);
}

/* ---- Reset ---- */
*,*::before,*::after{box-sizing:border-box;}
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0; font-family:var(--sans); color:var(--ink);
  background:var(--paper); line-height:1.8; font-weight:400;
  letter-spacing:.02em; -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;}
h1,h2,h3,h4,p,figure,ul,ol{margin:0;padding:0;}
ul,ol{list-style:none;}
::selection{background:var(--teal);color:#fff;}

/* ---- Accessibility: focus, skip link, sr-only ---- */
:focus-visible{outline:3px solid var(--teal);outline-offset:3px;border-radius:2px;}
.site-header.solid :focus-visible{outline-color:var(--teal-600);}
.bg-navy :focus-visible,.bg-navy-900 :focus-visible,.site-header:not(.solid) :focus-visible,.page-hero :focus-visible,.footer-cta :focus-visible{outline-color:#fff;}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}
.skip-link{position:fixed;top:8px;left:8px;z-index:400;background:var(--navy-900);color:#fff;padding:12px 20px;font-size:14px;font-weight:700;letter-spacing:.06em;transform:translateY(-160%);transition:transform .25s var(--ease);box-shadow:var(--shadow-md);}
.skip-link:focus{transform:none;}

/* ---- Layout helpers ---- */
.wrap{max-width:var(--maxw);margin:0 auto;padding-inline:var(--gut);}
.wrap-wide{max-width:1480px;margin:0 auto;padding-inline:var(--gut);}
section{position:relative;}
.pad{padding-block:clamp(72px,9vw,140px);}
.pad-sm{padding-block:clamp(48px,6vw,88px);}
.bg-mist{background:var(--mist);}
.bg-navy{background:var(--navy-800);color:#fff;}
.bg-navy-900{background:var(--navy-900);color:#fff;}
.center{text-align:center;}

/* ---- Type ---- */
.kicker{
  font-family:var(--sans); font-size:12px; font-weight:700;
  letter-spacing:.32em; text-transform:uppercase; color:var(--teal);
  display:inline-flex; align-items:center; gap:14px;
}
.kicker::before{content:"";width:30px;height:1px;background:var(--teal);display:inline-block;}
.kicker.solo::before{display:none;}
.kicker-jp{
  font-family:var(--sans); font-size:13px; font-weight:700;
  letter-spacing:.3em; color:var(--teal);
}

.display{
  font-family:var(--serif); font-weight:700; line-height:1.18;
  letter-spacing:.04em; color:var(--navy-900);
}
.bg-navy .display,.bg-navy-900 .display{color:#fff;}
.h-xxl{font-size:clamp(34px,5.4vw,72px);}
.h-xl{font-size:clamp(30px,4.2vw,52px);}
.h-lg{font-size:clamp(25px,3.2vw,38px);}
.h-md{font-size:clamp(21px,2.4vw,28px);}
.sect-head{ margin-bottom:clamp(36px,4vw,60px); }
.sect-head .display{margin-top:18px;}
.lede{ font-size:clamp(15px,1.25vw,17px); color:var(--ink-70); line-height:2.0; max-width:58ch; text-align:justify; }
.bg-navy .lede,.bg-navy-900 .lede{color:rgba(255,255,255,.78);}
.muted{color:var(--ink-50);}
.en{font-family:var(--sans);font-weight:500;letter-spacing:.14em;}
.num{font-family:var(--sans);font-weight:700;font-style:italic;color:var(--teal);letter-spacing:.04em;}

/* ---- Buttons ---- */
.btn{
  display:inline-flex; align-items:center; gap:14px;
  font-size:14px; font-weight:700; letter-spacing:.12em;
  padding:16px 30px; border:1px solid transparent; background:var(--navy-800);
  color:#fff; transition:.45s var(--ease); position:relative; overflow:hidden;
}
.btn .arr{transition:transform .45s var(--ease);}
.btn:hover{background:var(--teal);}
.btn:hover .arr{transform:translateX(5px);}
.btn--ghost{ background:transparent; border-color:rgba(255,255,255,.4); color:#fff; }
.btn--ghost:hover{ background:#fff; color:var(--navy-800); border-color:#fff; }
.btn--line{ background:transparent; border-color:var(--line); color:var(--navy-800); }
.btn--line:hover{ background:var(--navy-800); color:#fff; border-color:var(--navy-800); }
.btn--teal{background:var(--teal);}
.btn--teal:hover{background:var(--teal-600);}
.btn--lg{padding:19px 40px;font-size:15px;}

.link-more{
  display:inline-flex;align-items:center;gap:12px;font-size:13px;font-weight:700;
  letter-spacing:.14em;color:var(--navy-800);transition:.4s var(--ease);
}
.link-more .arr{display:inline-flex;width:32px;height:32px;border:1px solid var(--line);
  border-radius:50%;align-items:center;justify-content:center;transition:.4s var(--ease);}
.link-more:hover .arr{background:var(--teal);border-color:var(--teal);color:#fff;transform:translateX(4px);}
.bg-navy .link-more,.bg-navy-900 .link-more{color:#fff;}
.bg-navy .link-more .arr{border-color:rgba(255,255,255,.3);}

/* ============================================================
   HEADER
   ============================================================ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;height:var(--header-h);
  display:flex;align-items:center;
  transition:background .4s var(--ease),box-shadow .4s var(--ease),border-color .4s var(--ease);
  border-bottom:1px solid transparent;
}
.site-header .wrap-wide{display:flex;align-items:center;justify-content:space-between;width:100%;}
.brand{display:flex;align-items:center;gap:14px;}
.brand .brand-logo{height:30px;width:auto;display:block;color:#fff;transition:color .4s var(--ease);}
.site-header.solid .brand .brand-logo{color:var(--navy-900);}
.brand .mark{width:38px;height:38px;flex:none;}
.brand .mark .p1{fill:var(--teal);}
.brand .mark .p2{fill:#fff;}
.brand .name{display:flex;flex-direction:column;line-height:1;gap:5px;}
.brand .name .jp{font-family:var(--serif);font-weight:700;font-size:19px;letter-spacing:.12em;color:#fff;}
.brand .name .en{font-size:9px;font-weight:600;letter-spacing:.34em;color:rgba(255,255,255,.6);}

.nav{display:flex;align-items:center;gap:clamp(14px,2vw,34px);}
.nav a{
  position:relative;font-size:14px;font-weight:500;letter-spacing:.08em;color:rgba(255,255,255,.86);
  padding:6px 0;transition:color .3s;
}
.nav a .en{display:block;font-size:9px;letter-spacing:.2em;color:rgba(255,255,255,.66);margin-top:3px;font-weight:600;}
.nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--teal);transition:width .35s var(--ease);}
.nav a:hover::after,.nav a.active::after{width:100%;}
.nav a:hover,.nav a.active{color:#fff;}
.header-cta{display:flex;align-items:center;gap:18px;}
.header-tel{display:flex;flex-direction:column;line-height:1;color:#fff;text-align:right;}
.header-tel .lab{font-size:9px;letter-spacing:.24em;color:rgba(255,255,255,.5);font-weight:600;}
.header-tel .no{font-family:var(--serif);font-weight:700;font-size:18px;letter-spacing:.04em;margin-top:4px;}
.header-contact{
  display:inline-flex;align-items:center;gap:10px;background:var(--teal);color:#fff;
  font-size:13px;font-weight:700;letter-spacing:.1em;padding:13px 22px;transition:.4s var(--ease);
}
.header-contact:hover{background:#fff;color:var(--navy-800);}

/* scrolled / solid state */
.site-header.solid{background:rgba(255,255,255,.96);backdrop-filter:saturate(1.4) blur(8px);border-bottom-color:var(--line);box-shadow:0 4px 24px rgba(16,42,67,.06);}
.site-header.solid .brand .name .jp{color:var(--navy-900);}
.site-header.solid .brand .name .en{color:var(--ink-50);}
.site-header.solid .brand .mark .p2{fill:var(--navy-800);}
.site-header.solid .nav a{color:var(--ink-70);}
.site-header.solid .nav a .en{color:var(--ink-50);}
.site-header.solid .nav a:hover,.site-header.solid .nav a.active{color:var(--navy-900);}
.site-header.solid .header-tel{color:var(--navy-900);}
.site-header.solid .header-tel .lab{color:var(--ink-50);}

/* burger */
.burger{display:none;flex-direction:column;gap:6px;width:30px;height:22px;justify-content:center;background:none;border:none;padding:0;}
.burger span{height:2px;width:100%;background:#fff;transition:.35s var(--ease);}
.site-header.solid .burger span{background:var(--navy-800);}

/* mobile drawer */
.drawer{position:fixed;inset:0;z-index:200;background:var(--navy-900);transform:translateX(100%);transition:transform .5s var(--ease);display:flex;flex-direction:column;padding:88px var(--gut) 40px;visibility:hidden;}
.drawer.open{transform:none;visibility:visible;}
.drawer-close{position:absolute;top:26px;right:var(--gut);width:34px;height:34px;background:none;border:none;}
.drawer-close::before,.drawer-close::after{content:"";position:absolute;top:16px;left:4px;width:26px;height:2px;background:#fff;}
.drawer-close::before{transform:rotate(45deg);}
.drawer-close::after{transform:rotate(-45deg);}
.drawer a{padding:18px 0;border-bottom:1px solid rgba(255,255,255,.1);color:#fff;display:flex;justify-content:space-between;align-items:baseline;}
.drawer a .jp{font-family:var(--serif);font-size:22px;font-weight:600;}
.drawer a .en{font-size:10px;letter-spacing:.24em;color:var(--teal-300);}
.drawer .drawer-foot{margin-top:auto;display:flex;gap:14px;padding-top:30px;}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{background:var(--navy-900);color:#fff;}
.footer-cta{
  background:linear-gradient(120deg,var(--navy-800),var(--navy-700));
  position:relative;overflow:hidden;
}
.footer-cta .wrap{position:relative;z-index:2;display:flex;flex-wrap:wrap;gap:30px;align-items:center;justify-content:space-between;padding-block:clamp(56px,7vw,96px);}
.footer-cta .blueprint{position:absolute;inset:0;opacity:.4;}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-block:clamp(56px,6vw,84px);}
.footer-brand .brand-logo{height:38px;width:auto;display:block;color:#fff;margin-bottom:22px;}
.footer-brand .mark{width:46px;height:46px;margin-bottom:20px;}
.footer-brand .mark .p1{fill:var(--teal);}
.footer-brand .mark .p2{fill:#fff;}
.footer-brand .fname{font-family:var(--serif);font-size:22px;font-weight:700;letter-spacing:.1em;}
.footer-brand .fen{font-size:10px;letter-spacing:.3em;color:var(--teal-300);margin-top:6px;}
.footer-brand address{font-style:normal;color:rgba(255,255,255,.6);font-size:13px;line-height:2;margin-top:24px;}
.footer-col h4{font-size:12px;letter-spacing:.2em;color:var(--teal-300);font-weight:700;margin-bottom:20px;}
.footer-col a{display:block;color:rgba(255,255,255,.74);font-size:14px;padding:7px 0;transition:.3s;}
.footer-col a:hover{color:#fff;padding-left:6px;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-block:26px;display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center;}
.footer-bottom .copy{font-size:12px;color:rgba(255,255,255,.5);letter-spacing:.06em;}
.footer-bottom .legal{display:flex;gap:24px;flex-wrap:wrap;}
.footer-bottom .legal a{font-size:12px;color:rgba(255,255,255,.6);}
.footer-bottom .legal a:hover{color:#fff;}

/* ============================================================
   PLACEHOLDER IMAGERY (blueprint style)
   ============================================================ */
.ph{
  position:relative;overflow:hidden;background:var(--navy-800);
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(135deg,var(--navy-700),var(--navy-900));
  background-size:34px 34px,34px 34px,100% 100%;
}
.ph::after{
  content:attr(data-label);position:absolute;left:16px;bottom:14px;
  font-size:11px;letter-spacing:.18em;color:rgba(255,255,255,.55);font-weight:600;
  display:flex;align-items:center;gap:8px;
}
.ph::before{
  content:"";position:absolute;left:16px;top:16px;width:26px;height:26px;
  border:1.5px solid rgba(255,255,255,.3);
  -webkit-mask:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M4 7h4l2-2h4l2 2h4v12H4z' fill='none' stroke='black' stroke-width='1.6'/><circle cx='12' cy='13' r='3.2' fill='none' stroke='black' stroke-width='1.6'/></svg>") center/contain no-repeat;
  mask:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M4 7h4l2-2h4l2 2h4v12H4z' fill='none' stroke='black' stroke-width='1.6'/><circle cx='12' cy='13' r='3.2' fill='none' stroke='black' stroke-width='1.6'/></svg>") center/contain no-repeat;
  background:rgba(255,255,255,.4);
}
.ph--light{
  background-image:
    linear-gradient(rgba(16,42,67,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(16,42,67,.06) 1px,transparent 1px),
    linear-gradient(135deg,#eef1f4,#dfe5eb);
}
.ph--light::after{color:var(--ink-50);}
.ph--light::before{border-color:rgba(16,42,67,.3);background:rgba(16,42,67,.35);}
.ph--teal{ background-image:
    linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px),
    linear-gradient(135deg,var(--teal-600),var(--navy-800));
}
.ph--image{background:none;}
.ph--image img{width:100%;height:100%;display:block;object-fit:cover;}
.ph--image::before,.ph--image::after{display:none;}

/* ============================================================
   PAGE HERO (sub pages)
   ============================================================ */
.page-hero{position:relative;background:var(--navy-900);color:#fff;overflow:hidden;padding-top:var(--header-h);}
.page-hero .ph-bg{position:absolute;inset:0;opacity:.5;}
.page-hero .veil{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,31,51,.7),rgba(10,31,51,.92));}
.page-hero .wrap{position:relative;z-index:2;padding-block:clamp(70px,8vw,120px);}
.page-hero .en-big{font-size:clamp(13px,1.4vw,15px);letter-spacing:.3em;color:var(--teal-300);font-weight:600;}
.page-hero h1{font-family:var(--serif);font-weight:700;font-size:clamp(32px,4.6vw,58px);letter-spacing:.06em;margin-top:14px;}
.breadcrumb{display:flex;gap:12px;align-items:center;font-size:12px;color:rgba(255,255,255,.6);letter-spacing:.06em;margin-top:26px;}
.breadcrumb a:hover{color:#fff;}
.breadcrumb .sep{opacity:.5;}

/* ============================================================
   REVEAL ANIMATION
   ============================================================ */
.reveal{opacity:0;transform:translateY(22px);transition:opacity 1s var(--ease),transform 1s var(--ease);}
.reveal.in{opacity:1;transform:none;}
.reveal-d1{transition-delay:.1s;}
.reveal-d2{transition-delay:.2s;}
.reveal-d3{transition-delay:.3s;}
.reveal-d4{transition-delay:.4s;}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none;}
  html{scroll-behavior:auto;}
}

/* ============================================================
   CARDS / GRIDS — shared building blocks
   ============================================================ */
.grid{display:grid;gap:clamp(20px,2.4vw,34px);}
.g-2{grid-template-columns:repeat(2,1fr);}
.g-3{grid-template-columns:repeat(3,1fr);}
.g-4{grid-template-columns:repeat(4,1fr);}

/* work card */
.work-card{display:block;background:#fff;group:work;transition:.5s var(--ease);}
.work-card .thumb{position:relative;aspect-ratio:4/3;overflow:hidden;}
.work-card .thumb .ph{position:absolute;inset:0;transition:transform 1.1s var(--ease);}
.work-card:hover .thumb .ph{transform:scale(1.06);}
.work-card .cat{position:absolute;top:0;left:0;z-index:3;background:var(--navy-800);color:#fff;font-size:11px;font-weight:700;letter-spacing:.14em;padding:8px 14px;}
.work-card .body{padding:22px 4px 4px;}
.work-card .ttl{font-family:var(--serif);font-size:19px;font-weight:600;color:var(--navy-900);line-height:1.5;transition:color .3s;}
.work-card:hover .ttl{color:var(--teal);}
.work-card .meta{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:var(--ink-50);margin-top:12px;letter-spacing:.04em;}
.work-card .meta span{position:relative;padding-left:14px;}
.work-card .meta span::before{content:"";position:absolute;left:0;top:8px;width:5px;height:5px;background:var(--teal);}

/* number feature */
.feature{position:relative;padding-top:30px;border-top:1px solid var(--line);}
.feature .fnum{font-family:var(--sans);font-style:italic;font-weight:700;font-size:15px;color:var(--teal);letter-spacing:.04em;}
.feature h3{font-family:var(--serif);font-size:clamp(20px,2vw,24px);font-weight:600;color:var(--navy-900);margin:16px 0 14px;line-height:1.5;}
.feature p{font-size:14.5px;color:var(--ink-70);line-height:1.95;}
.bg-navy .feature{border-top-color:rgba(255,255,255,.2);}
.bg-navy .feature h3{color:#fff;}
.bg-navy .feature p{color:rgba(255,255,255,.72);}

/* stat */
.stat .v{font-family:var(--serif);font-weight:700;color:var(--navy-900);font-size:clamp(38px,5vw,64px);line-height:1;letter-spacing:.02em;}
.stat .v .u{font-size:.42em;font-weight:600;margin-left:6px;letter-spacing:.04em;}
.stat .l{font-size:13px;color:var(--ink-50);letter-spacing:.1em;margin-top:14px;font-weight:500;}
.bg-navy .stat .v,.bg-navy-900 .stat .v{color:#fff;}
.bg-navy .stat .v .u{color:var(--teal-300);}
.bg-navy .stat .l,.bg-navy-900 .stat .l{color:rgba(255,255,255,.6);}

/* news list */
.news-row{display:grid;grid-template-columns:140px 130px 1fr auto;gap:24px;align-items:center;padding:24px 0;border-bottom:1px solid var(--line);transition:.4s var(--ease);}
.news-row:hover{background:var(--mist);padding-inline:18px;}
.news-row .date{font-family:var(--sans);font-weight:500;color:var(--ink-50);font-size:13px;letter-spacing:.06em;}
.news-row .tag{justify-self:start;font-size:11px;font-weight:700;letter-spacing:.1em;padding:6px 14px;border:1px solid var(--line);color:var(--navy-700);}
.news-row .tag.is-ir{background:var(--navy-800);color:#fff;border-color:var(--navy-800);}
.news-row .tag.is-news{background:var(--teal);color:#fff;border-color:var(--teal);}
.news-row .tag.is-recruit{background:var(--gold);color:#fff;border-color:var(--gold);}
.news-row .ttl{font-size:15px;color:var(--navy-900);font-weight:500;transition:color .3s;}
.news-row:hover .ttl{color:var(--teal);}
.news-row .arr{color:var(--ink-30);transition:.3s;}
.news-row:hover .arr{color:var(--teal);transform:translateX(4px);}

/* data table */
.data-table{width:100%;border-collapse:collapse;}
.data-table th,.data-table td{text-align:left;padding:20px 24px;border-bottom:1px solid var(--line);font-size:14.5px;vertical-align:top;}
.data-table th{width:200px;font-weight:700;color:var(--navy-900);background:var(--mist);letter-spacing:.06em;}
.data-table td{color:var(--ink-70);line-height:1.9;}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:10px;}
.chip{font-size:12px;letter-spacing:.06em;padding:8px 16px;border:1px solid var(--line);color:var(--ink-70);background:#fff;}
.chip--on{background:var(--navy-800);color:#fff;border-color:var(--navy-800);}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:520px){
  .brand .brand-logo{height:24px;}
}
@media (max-width:1080px){
  .footer-top{grid-template-columns:1fr 1fr;gap:36px;}
}
@media (max-width:980px){
  .nav,.header-tel{display:none;}
  .burger{display:flex;}
  .g-4{grid-template-columns:repeat(2,1fr);}
  .news-row{grid-template-columns:110px 1fr;gap:8px 18px;}
  .news-row .ttl{grid-column:1/-1;}
  .news-row .arr{display:none;}
}
@media (max-width:720px){
  .g-2,.g-3,.g-4{grid-template-columns:1fr;}
  .footer-top{grid-template-columns:1fr;}
  .header-tel{display:none;}
  .data-table th{width:120px;padding:14px;}
  .data-table td{padding:14px;}
}