/* ============================================================
   SANKAKU YELL — LIGHT / CORPORATE TRUST 案
   ブランドカラー（#050F78 / #1F5A9E / #74C4DF / #B1D4FA）はそのまま
   ============================================================ */
:root{
  --navy:#050F78;
  --blue:#1F5A9E;
  --cyan:#74C4DF;
  --cyan-dp:#54A2BE;
  --sky:#B1D4FA;
  --sky-2:#E3EEFA;

  --ink:#0E1830;          /* 見出し */
  --text:#43526B;         /* 本文 */
  --muted:#6E7F97;
  --dim:#93A2B6;

  --bg:#FFFFFF;
  --soft:#F4F8FC;
  --tint:#EAF2FA;
  --line:#E3EAF3;
  --line-2:#CFDCEA;

  --grad:linear-gradient(120deg,var(--cyan) 0%,var(--blue) 55%,var(--navy) 100%);

  --jp:"Noto Sans JP","Noto Sans CJK JP","Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  --en:"Inter","Noto Sans JP",sans-serif;
  --sr:"EB Garamond",Georgia,serif;

  --gut:clamp(20px,5vw,80px);
  --max:1200px;
  --sh:0 18px 46px -26px rgba(5,15,120,.28);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--text);
  font-family:var(--jp);font-weight:400;
  line-height:2.05;letter-spacing:.045em;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--sky);color:var(--navy)}

/* ---------- ambient ---------- */
.bg-fx{position:fixed;inset:0;z-index:0;pointer-events:none}
.bg-fx .grid{
  position:absolute;inset:0;opacity:.85;
  background-image:
    linear-gradient(rgba(5,15,120,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(5,15,120,.035) 1px,transparent 1px);
  background-size:96px 96px;
  mask-image:radial-gradient(ellipse 100% 60% at 50% 0%,#000 5%,transparent 70%);
}
.bg-fx .glow{position:absolute;border-radius:50%;filter:blur(120px);opacity:.55}
.bg-fx .g1{width:760px;height:760px;top:-360px;right:-200px;background:radial-gradient(circle,rgba(177,212,250,.75),transparent 66%)}
.bg-fx .g2{width:520px;height:520px;top:16%;left:-260px;background:radial-gradient(circle,rgba(116,196,223,.30),transparent 66%)}
.bg-fx .g3{display:none}
.bg-fx .noise{display:none}

/* ---------- header ---------- */
header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;gap:24px;
  padding:0 var(--gut);height:88px;
  background:rgba(255,255,255,.82);backdrop-filter:blur(16px) saturate(150%);
  border-bottom:1px solid transparent;transition:.4s;
}
header::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad)}
header.solid{height:72px;background:rgba(255,255,255,.96);border-bottom-color:var(--line);box-shadow:0 10px 30px -24px rgba(5,15,120,.4)}
.brand{display:flex;align-items:center;gap:14px;flex:0 0 auto}
.brand img{height:36px;width:auto;transition:.4s}
header.solid .brand img{height:31px}
.brand .rule{width:1px;height:26px;background:var(--line-2)}
.brand small{font-family:var(--en);font-size:9.5px;letter-spacing:.3em;color:var(--dim);line-height:1.5;text-transform:uppercase}
nav{margin-left:auto;display:flex;align-items:center;gap:clamp(14px,2.2vw,34px)}
nav a.nv{
  font-size:12.5px;font-weight:500;letter-spacing:.16em;color:var(--muted);
  position:relative;padding:8px 0;transition:.3s;white-space:nowrap;
}
nav a.nv::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--grad);transition:.35s}
nav a.nv:hover,nav a.nv.on{color:var(--navy)}
nav a.nv:hover::after,nav a.nv.on::after{width:100%}
.btn-cta{
  font-size:12px;letter-spacing:.16em;font-weight:600;
  padding:13px 26px;border-radius:999px;color:#fff;background:var(--navy);
  position:relative;overflow:hidden;transition:.35s;white-space:nowrap;border:1px solid var(--navy);
}
.btn-cta span{position:relative;z-index:2}
.btn-cta::before{content:"";position:absolute;inset:0;background:var(--grad);opacity:0;transition:.4s}
.btn-cta:hover::before{opacity:1}
.btn-cta:hover{box-shadow:var(--sh);transform:translateY(-1px)}
.burger{display:none;width:42px;height:42px;border:1px solid var(--line-2);border-radius:8px;background:#fff;cursor:pointer;position:relative}
.burger i{position:absolute;left:12px;width:18px;height:1.5px;background:var(--navy);transition:.3s}
.burger i:nth-child(1){top:15px}.burger i:nth-child(2){top:20px}.burger i:nth-child(3){top:25px}
.burger.x i:nth-child(1){top:20px;transform:rotate(45deg)}
.burger.x i:nth-child(2){opacity:0}
.burger.x i:nth-child(3){top:20px;transform:rotate(-45deg)}

/* ---------- layout ---------- */
main{position:relative;z-index:2}
.page{display:none}
.page.live{display:block;animation:pin .7s cubic-bezier(.2,.7,.3,1)}
@keyframes pin{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.wrap{max-width:var(--max);margin-inline:auto;padding-inline:var(--gut)}
section{position:relative;padding:clamp(66px,8vw,120px) 0}
#works{padding-top:clamp(26px,3vw,44px)}

/* ---------- type ---------- */
.eyebrow{
  font-family:var(--en);font-size:10.5px;font-weight:600;letter-spacing:.42em;
  color:var(--blue);text-transform:uppercase;display:flex;align-items:center;gap:14px;
}
.eyebrow::before{content:"";width:34px;height:2px;background:var(--grad)}
.h-sec{
  font-size:clamp(25px,3.4vw,44px);font-weight:700;line-height:1.55;letter-spacing:.09em;
  margin:20px 0 0;color:var(--ink);text-wrap:balance;
}
.h-sec em{font-style:normal;color:var(--navy);position:relative;white-space:nowrap}
.h-sec em::after{content:"";position:absolute;left:0;right:0;bottom:.05em;height:.22em;background:rgba(177,212,250,.45);z-index:-1;border-radius:1px}
.lead{color:var(--text);font-size:clamp(13.5px,1.05vw,15px);line-height:2.3;letter-spacing:.06em}
.lead + .lead{margin-top:1.4em}

.vlabel{
  writing-mode:vertical-rl;font-size:15px;font-weight:600;letter-spacing:.5em;
  color:var(--navy);display:flex;align-items:flex-start;gap:20px;height:max-content;padding-top:4px;
}
.vlabel::after{content:"";width:1px;flex:0 0 1px;height:130px;background:linear-gradient(180deg,var(--blue),rgba(31,90,158,0))}

.pill{
  display:inline-flex;align-items:center;gap:12px;
  font-family:var(--sr);font-style:italic;font-size:16px;letter-spacing:.06em;
  padding:13px 30px;border:1px solid var(--line-2);border-radius:999px;
  color:var(--navy);background:#fff;position:relative;overflow:hidden;transition:.4s;
}
.pill span{position:relative;z-index:2;display:flex;align-items:center;gap:10px}
.pill::before{content:"";position:absolute;inset:0;background:var(--grad);transform:translateX(-101%);transition:.45s cubic-bezier(.2,.7,.3,1)}
.pill:hover::before{transform:translateX(0)}
.pill:hover{border-color:transparent;color:#fff;box-shadow:var(--sh)}
.pill .ar{width:22px;height:1px;background:currentColor;position:relative}
.pill .ar::after{content:"";position:absolute;right:0;top:-3px;width:7px;height:7px;border-top:1px solid currentColor;border-right:1px solid currentColor;transform:rotate(45deg)}

/* ---------- HERO ---------- */
.hero{
  min-height:clamp(640px,94vh,1000px);display:flex;align-items:center;
  padding:clamp(150px,16vh,200px) 0 clamp(60px,8vh,90px);overflow:hidden;
  background:linear-gradient(180deg,#fff 0%,#fff 40%,var(--soft) 100%);
}
.hero-art{position:absolute;inset:0;z-index:0;pointer-events:none}
.hero-art svg{position:absolute;top:48%;left:70%;transform:translate(-50%,-50%);width:min(820px,84vw);opacity:.9}
.tri{fill:none;stroke-width:1.2;transform-origin:300px 300px}
.tri.a{stroke:url(#gA);animation:spin 48s linear infinite}
.tri.b{stroke:url(#gB);animation:spin 66s linear infinite reverse}
.tri.c{stroke:rgba(5,15,120,.10);animation:spin 96s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.hero .wrap{position:relative;z-index:3;width:100%}
.hero-in{max-width:830px}
.h1{
  font-size:clamp(32px,5.4vw,72px);font-weight:900;line-height:1.42;letter-spacing:.05em;
  margin:26px 0 0;color:var(--ink);
}
.h1 .g{color:var(--navy);position:relative;display:inline-block}
.h1 .g::after{content:"";position:absolute;left:0;right:0;bottom:.10em;height:.24em;background:rgba(177,212,250,.6);z-index:-1}
.hero-sub{margin-top:34px;max-width:640px}
.hero-cta{margin-top:46px;display:flex;gap:16px;flex-wrap:wrap}
.hero-facts{
  margin-top:clamp(48px,7vw,86px);display:grid;gap:0;
  grid-template-columns:repeat(3,1fr);border:1px solid var(--line);background:#fff;
  box-shadow:var(--sh);border-radius:4px;overflow:hidden;
}
.hero-facts div{padding:24px 26px;border-right:1px solid var(--line);position:relative}
.hero-facts div:last-child{border-right:0}
.hero-facts div::before{content:"";position:absolute;top:0;left:0;width:100%;height:3px;background:var(--grad);opacity:0;transition:.35s}
.hero-facts div:hover::before{opacity:1}
.hero-facts b{display:block;font-family:var(--en);font-size:11px;letter-spacing:.3em;color:var(--blue);font-weight:600}
.hero-facts p{margin-top:8px;font-size:13.5px;font-weight:500;letter-spacing:.08em;line-height:1.7;color:var(--ink)}

/* ---------- page banner ---------- */
.banner{
  padding:clamp(150px,17vw,225px) 0 clamp(48px,6vw,74px);overflow:hidden;
  background:linear-gradient(150deg,var(--tint) 0%,#fff 62%);
  border-bottom:1px solid var(--line);
}
.banner::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse 55% 100% at 88% 10%,rgba(116,196,223,.22),transparent 70%);
}
.banner .mesh{
  position:absolute;inset:0;opacity:.55;
  background-image:
    repeating-linear-gradient(60deg,rgba(5,15,120,.05) 0 1px,transparent 1px 62px),
    repeating-linear-gradient(-60deg,rgba(5,15,120,.05) 0 1px,transparent 1px 62px);
  mask-image:linear-gradient(90deg,transparent 40%,#000 100%);
}
.banner h1{position:relative;font-size:clamp(30px,5vw,58px);font-weight:900;letter-spacing:.14em;line-height:1.4;color:var(--ink)}
.banner .en{
  position:relative;display:block;font-family:var(--en);font-size:11px;font-weight:600;
  letter-spacing:.5em;color:var(--blue);text-transform:uppercase;margin-bottom:18px;
}
.crumb{position:relative;margin-top:22px;font-size:11px;letter-spacing:.18em;color:var(--dim);font-family:var(--en)}

/* ---------- message ---------- */
.msg{display:grid;grid-template-columns:auto 1fr;gap:clamp(28px,6vw,80px);align-items:start}
.msg-body{max-width:770px}
.figure{position:relative;margin-top:clamp(36px,5vw,60px);margin-bottom:26px}
.figure img{width:100%;border-radius:3px}
.figure::after{content:"";position:absolute;inset:0;pointer-events:none;box-shadow:inset 0 0 0 1px rgba(5,15,120,.08);border-radius:3px}
.figure .tag{
  position:absolute;left:0;bottom:0;transform:translateY(50%);
  background:#fff;border:1px solid var(--line-2);padding:11px 22px;border-radius:2px;
  font-family:var(--en);font-size:10px;letter-spacing:.34em;color:var(--blue);z-index:2;box-shadow:var(--sh);
}

/* ---------- service ---------- */
.svc{border-top:1px solid var(--line);padding:clamp(46px,6vw,80px) 0;position:relative}
.svc:last-of-type{border-bottom:1px solid var(--line)}
.svc-head{display:flex;align-items:flex-start;gap:clamp(18px,3vw,36px)}
.num{
  font-family:var(--en);font-size:clamp(52px,7.6vw,108px);font-weight:700;line-height:.82;
  color:transparent;-webkit-text-stroke:1.2px rgba(31,90,158,.42);flex:0 0 auto;letter-spacing:-.02em;
}
.svc-title{font-size:clamp(21px,2.8vw,33px);font-weight:700;letter-spacing:.14em;padding-top:6px;color:var(--ink)}
.svc-title .slash{color:var(--cyan);font-weight:400;margin-right:.4em}
.svc-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,64px);margin-top:clamp(26px,3.5vw,44px)}
.blist{list-style:none;display:grid;gap:14px;margin-top:26px}
.blist li{
  position:relative;padding:20px 24px 20px 48px;font-size:13.5px;line-height:2.15;color:var(--text);
  border:1px solid var(--line);background:#fff;border-radius:3px;transition:.35s;
}
.blist li::before{
  content:"";position:absolute;left:22px;top:29px;width:10px;height:10px;
  background:var(--grad);clip-path:polygon(50% 0,100% 100%,0 100%);
}
.blist li:hover{border-color:var(--line-2);box-shadow:var(--sh);transform:translateY(-2px)}
.thumbs{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px;margin-top:28px}
.thumb{
  position:relative;overflow:hidden;border:1px solid var(--line);border-radius:3px;
  background:#fff;aspect-ratio:3/2;transition:.45s;
}
.thumb img{width:100%;height:100%;object-fit:cover;transition:.5s}
.thumb::after{content:"";position:absolute;inset:0;pointer-events:none;transition:.5s;
  background:linear-gradient(180deg,transparent 55%,rgba(5,15,120,.55))}
.thumb span{
  position:absolute;left:12px;bottom:11px;z-index:3;
  font-family:var(--en);font-size:9px;letter-spacing:.26em;color:#fff;text-transform:uppercase;
}
.thumb:hover{border-color:var(--line-2);transform:translateY(-4px);box-shadow:var(--sh)}
.thumb:hover img{transform:scale(1.04)}

/* ---------- news ---------- */
.news-empty{
  border:1px dashed var(--line-2);padding:clamp(36px,5vw,64px);text-align:center;color:var(--muted);
  background:var(--soft);font-size:13px;letter-spacing:.14em;border-radius:3px;
}

/* ---------- company ---------- */
.ceo{display:grid;grid-template-columns:300px 1fr;gap:clamp(28px,5vw,64px);align-items:start}
.ceo-photo{position:relative;border:1px solid var(--line);padding:10px;background:#fff;box-shadow:var(--sh);border-radius:3px}
.ceo-photo img{width:100%}
.sign{margin-top:30px;display:flex;align-items:baseline;gap:16px}
.sign small{font-size:11px;letter-spacing:.24em;color:var(--dim)}
.sign b{font-size:19px;font-weight:600;letter-spacing:.26em;color:var(--ink)}
.dl{display:grid;grid-template-columns:repeat(2,1fr);gap:0 clamp(28px,5vw,70px);margin-top:clamp(34px,5vw,56px)}
.dl div{display:grid;grid-template-columns:110px 1fr;gap:20px;padding:20px 0;border-bottom:1px solid var(--line);align-items:start}
.dl dt{font-size:11.5px;letter-spacing:.24em;color:var(--blue);font-weight:600;padding-top:3px}
.dl dd{font-size:14px;letter-spacing:.06em;line-height:1.95;color:var(--ink)}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(14px,2vw,22px);margin-top:clamp(34px,5vw,54px)}
.card{
  position:relative;padding:clamp(28px,3vw,42px) clamp(22px,2.4vw,32px);
  border:1px solid var(--line);overflow:hidden;background:#fff;border-radius:3px;transition:.45s;
}
.card::before{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:var(--grad);transition:.5s}
.card:hover::before{width:100%}
.card:hover{transform:translateY(-6px);box-shadow:var(--sh);border-color:var(--line-2)}
.card i{font-family:var(--en);font-style:normal;font-size:12px;letter-spacing:.3em;color:var(--blue);font-weight:600}
.card h3{margin-top:22px;font-size:clamp(16px,1.6vw,20px);font-weight:700;line-height:1.85;letter-spacing:.1em;color:var(--ink)}
.card .mark{position:absolute;right:-16px;bottom:-16px;width:96px;opacity:.10;transition:.5s}
.card:hover .mark{opacity:.2;transform:rotate(14deg) scale(1.05)}

/* ---------- contact ---------- */
.contact{background:linear-gradient(180deg,#fff,var(--soft))}
.cgrid{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(32px,5vw,74px);align-items:start}
.cgrid .form{margin-top:0;max-width:none}
.cinfo dl{margin-top:34px;border-top:1px solid var(--line)}
.cinfo dl div{padding:18px 0;border-bottom:1px solid var(--line)}
.cinfo dt{font-size:11px;letter-spacing:.24em;color:var(--blue);font-weight:600}
.cinfo dd{margin-top:8px;font-size:13.5px;line-height:1.95;color:var(--ink)}
.form{max-width:760px;margin:clamp(36px,5vw,60px) auto 0;background:#fff;border:1px solid var(--line);
      padding:clamp(28px,4vw,52px);border-radius:4px;box-shadow:var(--sh)}
.field{margin-bottom:32px}
.field label{display:flex;align-items:center;gap:12px;font-size:12.5px;letter-spacing:.2em;font-weight:600;margin-bottom:13px;color:var(--ink)}
.req{font-size:9.5px;letter-spacing:.14em;padding:4px 9px;border-radius:3px;background:var(--navy);color:#fff;font-weight:700}
.field input,.field textarea{
  width:100%;background:#FBFCFE;border:1px solid var(--line-2);
  color:var(--ink);font-family:var(--jp);font-size:14.5px;letter-spacing:.06em;
  padding:15px 17px;transition:.3s;border-radius:3px;
}
.field textarea{min-height:170px;resize:vertical;line-height:1.95}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--blue);background:#fff;box-shadow:0 0 0 3px rgba(31,90,158,.12);
}
.pp{display:flex;flex-direction:column;gap:16px;margin:34px 0}
.pp a{font-size:12.5px;letter-spacing:.12em;border-bottom:1px solid var(--line-2);padding-bottom:4px;width:max-content;color:var(--blue);transition:.3s}
.pp a:hover{border-color:var(--blue)}
.pp label{display:flex;align-items:center;gap:12px;font-size:13px;letter-spacing:.1em;color:var(--text);cursor:pointer}
.pp input{width:17px;height:17px;accent-color:var(--navy)}
.submit{
  display:block;margin:0 auto;min-width:280px;border:none;cursor:pointer;
  padding:19px 40px;border-radius:999px;background:var(--navy);color:#fff;
  font-family:var(--jp);font-weight:700;font-size:15px;letter-spacing:.34em;
  transition:.4s;box-shadow:0 14px 34px -16px rgba(5,15,120,.7);
}
.submit:hover{transform:translateY(-3px);background:linear-gradient(120deg,var(--blue),var(--navy));box-shadow:0 22px 46px -18px rgba(5,15,120,.75)}

/* ---------- footer ---------- */
footer{position:relative;z-index:2;border-top:1px solid var(--line);background:var(--soft);
       padding:clamp(56px,7vw,88px) 0 40px;overflow:hidden}
.f-top{display:grid;grid-template-columns:1.1fr 1fr;gap:clamp(30px,5vw,70px);align-items:start}
.f-brand img{height:44px}
.f-brand p{margin-top:22px;font-size:12px;line-height:2.1;color:var(--muted);letter-spacing:.08em}
.f-nav{display:grid;grid-template-columns:repeat(2,1fr);gap:12px 20px}
.f-nav a{font-size:12.5px;letter-spacing:.18em;color:var(--text);padding:9px 0;border-bottom:1px solid var(--line);transition:.3s;display:block}
.f-nav a:hover{color:var(--navy);border-color:var(--line-2);padding-left:8px}
.f-bot{margin-top:clamp(40px,5vw,64px);padding-top:26px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.f-bot small{font-family:var(--en);font-size:10px;letter-spacing:.26em;color:var(--dim)}
.f-mark{position:absolute;right:2%;bottom:-40px;width:230px;opacity:.10;pointer-events:none}

/* ---------- reveal ---------- */
.rv{opacity:0;transform:translateY(26px);transition:opacity .9s cubic-bezier(.2,.7,.3,1),transform .9s cubic-bezier(.2,.7,.3,1)}
.rv.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media(max-width:1080px){
  .svc-grid,.ceo,.f-top,.cgrid{grid-template-columns:1fr}
  .ceo-photo{max-width:280px}
  .cards{grid-template-columns:1fr}
  .dl{grid-template-columns:1fr}
}
@media(max-width:860px){
  nav{position:fixed;inset:72px 0 auto;flex-direction:column;align-items:stretch;gap:0;
      background:#fff;border-bottom:1px solid var(--line);box-shadow:0 20px 40px -30px rgba(5,15,120,.5);
      padding:14px var(--gut) 28px;transform:translateY(-130%);transition:.45s cubic-bezier(.2,.7,.3,1)}
  nav.open{transform:none}
  nav a.nv{padding:16px 0;border-bottom:1px solid var(--line);font-size:14px}
  .btn-cta{margin-top:20px;text-align:center}
  .burger{display:block;margin-left:auto}
  .hero-facts{grid-template-columns:1fr}
  .hero-facts div{border-right:0;border-bottom:1px solid var(--line)}
  .hero-facts div:last-child{border-bottom:0}
  .msg{grid-template-columns:1fr}
  .vlabel{writing-mode:horizontal-tb;letter-spacing:.34em;align-items:center}
  .vlabel::after{height:1px;width:64px;flex:0 0 64px;background:linear-gradient(90deg,var(--blue),transparent)}
  .svc-head{flex-direction:column;gap:10px}
  .f-bot{flex-direction:column}
}
@media(max-width:560px){
  body{line-height:1.95}
  .thumbs{grid-template-columns:repeat(2,1fr)}
  .f-nav{grid-template-columns:1fr}
  .submit{width:100%;min-width:0}
}