/* ============================================================
   TechSeeker — Corporate Site Design System
   Tone: 信頼・誠実 / クリーン・明るい / 明朝見出し × テックの精度
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Shippori+Mincho+B1:wght@400;500;600;700;800&family=Noto+Sans+JP:wght@400;500;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root{
  /* Ink & paper */
  --ink:        #0c1322;
  --ink-soft:   #2b3650;
  --muted:      #5d6b85;
  --muted-2:    #8b96ad;
  --navy:       #070d1c;   /* deepest hero */
  --navy-2:     #0d1730;
  --navy-3:     #142347;
  --paper:      #ffffff;
  --paper-2:    #f4f7fc;   /* alt section */
  --paper-3:    #eef2f9;

  /* Brand */
  --blue:       #1f57e8;
  --blue-2:     #3d74ff;
  --blue-ink:   #16317e;
  --cyan:       #2bd4ee;
  --cyan-soft:  #7fe6f5;

  /* Lines & surfaces */
  --line:       rgba(12,19,34,.12);
  --line-2:     rgba(12,19,34,.07);
  --line-dark:  rgba(255,255,255,.14);
  --field:      #fbfcfe;

  /* Type */
  --serif: "Shippori Mincho B1", serif;
  --sans:  "Noto Sans JP", sans-serif;
  --mono:  "Space Grotesk", sans-serif;

  /* Metrics */
  --maxw: 1200px;
  --gut: clamp(20px, 5vw, 64px);
  --radius: 4px;
  --radius-lg: 8px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.8;
  font-size:16px;
  letter-spacing:.01em;
  font-feature-settings:"palt" 1;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
::selection{ background:var(--blue); color:#fff; }

/* ---------- layout ---------- */
.wrap{ max-width:var(--maxw); margin:0 auto; padding-inline:var(--gut); }
.section{ padding-block:clamp(72px,11vw,140px); position:relative; }
.section--paper2{ background:var(--paper-2); }
.section--dark{ background:var(--navy); color:#eaf0fb; }

/* ---------- typography ---------- */
.eyebrow{
  font-family:var(--mono);
  font-weight:600;
  font-size:13px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--blue);
  display:inline-flex;
  align-items:center;
  gap:12px;
}
.eyebrow::before{
  content:""; width:28px; height:1px; background:var(--blue); display:inline-block;
}
.section--dark .eyebrow{ color:var(--cyan); }
.section--dark .eyebrow::before{ background:var(--cyan); }

.h-display{
  font-family:var(--serif);
  font-weight:700;
  line-height:1.28;
  letter-spacing:.02em;
  font-size:clamp(30px,4.6vw,56px);
}
.h-section{
  font-family:var(--serif);
  font-weight:700;
  line-height:1.35;
  letter-spacing:.03em;
  font-size:clamp(26px,3.6vw,42px);
}
.h-sub{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(20px,2.4vw,27px);
  line-height:1.5;
  letter-spacing:.02em;
}
.lead{
  font-size:clamp(15px,1.25vw,17px);
  color:var(--ink-soft);
  line-height:2;
  max-width:60ch;
}
.section--dark .lead{ color:#b9c6e0; }
.muted{ color:var(--muted); }

.section-head{ margin-bottom:clamp(40px,6vw,68px); }
.section-head .h-section{ margin-top:18px; }
.section-head .lead{ margin-top:22px; }

/* ---------- buttons ---------- */
.btn{
  --bg:var(--blue); --fg:#fff;
  font-family:var(--sans); font-weight:700; font-size:15px;
  display:inline-flex; align-items:center; gap:12px;
  padding:16px 30px; border-radius:var(--radius);
  background:var(--bg); color:var(--fg);
  border:1px solid transparent; cursor:pointer;
  transition:transform .4s var(--ease), box-shadow .4s var(--ease), background .3s;
  box-shadow:0 10px 28px -12px rgba(31,87,232,.6);
}
.btn:hover{ transform:translateY(-2px); box-shadow:0 18px 38px -12px rgba(31,87,232,.7); }
.btn .arrow{ transition:transform .35s var(--ease); }
.btn:hover .arrow{ transform:translateX(5px); }
.btn--ghost{
  --bg:transparent; --fg:var(--ink);
  border-color:var(--line); box-shadow:none;
}
.btn--ghost:hover{ background:var(--paper-2); box-shadow:none; }
.btn--light{ --bg:#fff; --fg:var(--navy-2); box-shadow:0 10px 30px -14px rgba(0,0,0,.5); }
.btn--lg{ padding:19px 38px; font-size:16px; }

.textlink{
  display:inline-flex; align-items:center; gap:9px;
  font-weight:700; font-size:14px; color:var(--blue);
  font-family:var(--mono); letter-spacing:.02em;
}
.textlink .arrow{ transition:transform .35s var(--ease); }
.textlink:hover .arrow{ transform:translateX(5px); }

/* ============================================================
   HEADER / NAV
   ============================================================ */
.site-header{
  position:fixed; inset:0 0 auto 0; z-index:100;
  height:78px; display:flex; align-items:center;
  transition:background .4s var(--ease), box-shadow .4s var(--ease), height .4s var(--ease);
}
.site-header .wrap{ display:flex; align-items:center; justify-content:space-between; width:100%; }
.site-header.scrolled{
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(14px) saturate(1.4);
  box-shadow:0 1px 0 var(--line-2), 0 12px 30px -24px rgba(12,19,34,.5);
  height:66px;
}
.brand{ display:flex; align-items:center; gap:12px; }
.brand__mark{ width:40px; height:38px; flex:none; object-fit:contain; }
.brand__name{ font-family:var(--mono); font-weight:700; font-size:20px; letter-spacing:.01em; color:#fff; transition:color .4s; }
.brand__sub{ display:block; font-family:var(--sans); font-weight:500; font-size:10.5px; letter-spacing:.34em; color:rgba(255,255,255,.6); margin-top:1px; transition:color .4s; }
.scrolled .brand__name, .header--solid .brand__name{ color:var(--ink); }
.scrolled .brand__sub, .header--solid .brand__sub{ color:var(--muted); }

.nav{ display:flex; align-items:center; gap:4px; }
.nav a{
  font-size:14px; font-weight:500; padding:10px 16px; border-radius:var(--radius);
  color:rgba(255,255,255,.82); position:relative; transition:color .3s;
}
.nav a:hover{ color:#fff; }
.scrolled .nav a, .header--solid .nav a{ color:var(--ink-soft); }
.scrolled .nav a:hover, .header--solid .nav a:hover{ color:var(--blue); }
.nav a.active{ color:#fff; }
.scrolled .nav a.active, .header--solid .nav a.active{ color:var(--blue); }
.nav a.active::after{
  content:""; position:absolute; left:16px; right:16px; bottom:2px; height:2px;
  background:currentColor; border-radius:2px;
}
.header-cta{ margin-left:14px; }
.header-cta.btn{ padding:11px 22px; font-size:14px; box-shadow:none; }
.scrolled .header-cta, .header--solid .header-cta{ box-shadow:0 10px 28px -14px rgba(31,87,232,.6); }

.nav-toggle{ display:none; flex-direction:column; gap:5px; width:42px; height:42px; align-items:center; justify-content:center; background:none; border:none; cursor:pointer; }
.nav-toggle span{ width:22px; height:2px; background:#fff; transition:.35s var(--ease); }
.scrolled .nav-toggle span, .header--solid .nav-toggle span{ background:var(--ink); }

@media (max-width:980px){
  .nav, .header-cta{ display:none; }
  .nav-toggle{ display:flex; }
  .nav.open{
    display:flex; position:fixed; inset:0; z-index:90;
    flex-direction:column; align-items:flex-start; justify-content:center;
    gap:8px; padding:0 var(--gut);
    background:rgba(255,255,255,.98); backdrop-filter:blur(8px);
  }
  .nav.open a{ color:var(--ink); font-family:var(--serif); font-size:24px; padding:14px 0; }
  .nav.open .header-cta{ display:inline-flex; margin:20px 0 0; }
  body.menu-open{ overflow:hidden; }
  .nav-toggle.is-open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
  .nav-toggle.is-open span:nth-child(2){ opacity:0; }
  .nav-toggle.is-open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{ background:var(--navy); color:#c2cee6; padding-block:clamp(64px,8vw,96px) 0; }
.footer-top{ display:grid; grid-template-columns:1.4fr 1fr 1fr; gap:48px; padding-bottom:56px; border-bottom:1px solid var(--line-dark); }
.footer-brand .brand__name{ color:#fff; }
.footer-brand .brand__sub{ color:rgba(255,255,255,.5); }
.footer-brand p{ margin-top:22px; font-size:14px; line-height:2; color:#92a1c0; max-width:34ch; }
.footer-col h4{ font-family:var(--mono); font-size:12px; letter-spacing:.18em; text-transform:uppercase; color:var(--cyan); margin-bottom:20px; font-weight:600; }
.footer-col ul{ list-style:none; display:flex; flex-direction:column; gap:13px; }
.footer-col a{ font-size:14.5px; color:#aebbd6; transition:color .3s, padding .3s; }
.footer-col a:hover{ color:#fff; padding-left:5px; }
.footer-bottom{ display:flex; align-items:center; justify-content:space-between; padding-block:28px; flex-wrap:wrap; gap:12px; }
.footer-bottom small{ font-size:12.5px; color:#7585a3; font-family:var(--mono); letter-spacing:.04em; }
@media (max-width:860px){ .footer-top{ grid-template-columns:1fr 1fr; } .footer-brand{ grid-column:1/-1; } }
@media (max-width:560px){ .footer-top{ grid-template-columns:1fr; } }

/* ============================================================
   PAGE HERO (sub-pages)
   ============================================================ */
.page-hero{
  position:relative; background:var(--navy); color:#fff; overflow:hidden;
  padding-top:160px; padding-bottom:clamp(56px,8vw,96px);
}
.page-hero__canvas{ position:absolute; inset:0; width:100%; height:100%; opacity:.55; }
.page-hero .wrap{ position:relative; z-index:2; }
.page-hero__crumb{ font-family:var(--mono); font-size:12.5px; letter-spacing:.12em; color:var(--cyan); display:flex; gap:10px; align-items:center; margin-bottom:22px; }
.page-hero__crumb a{ color:rgba(255,255,255,.6); }
.page-hero__crumb a:hover{ color:#fff; }
.page-hero h1{ font-family:var(--serif); font-weight:700; font-size:clamp(32px,5vw,58px); line-height:1.25; letter-spacing:.03em; }
.page-hero .latin{ font-family:var(--mono); font-weight:500; font-size:14px; letter-spacing:.3em; text-transform:uppercase; color:var(--cyan-soft); margin-top:18px; display:block; }
.page-hero .lead{ color:#c0cde6; margin-top:24px; }

/* ============================================================
   REVEAL ANIMATION
   ============================================================ */
.reveal{ opacity:0; transform:translateY(22px); transition:opacity 1.1s var(--ease), transform 1.1s var(--ease); }
.reveal.in{ opacity:1; transform:none; }
.reveal.d1{ transition-delay:.08s; } .reveal.d2{ transition-delay:.16s; }
.reveal.d3{ transition-delay:.24s; } .reveal.d4{ transition-delay:.32s; }
/* instant fallback: hidden/throttled tabs freeze transitions — show content immediately */
.reveal-instant .reveal{ opacity:1 !important; transform:none !important; transition:none !important; }
@media (prefers-reduced-motion:reduce){ .reveal{ opacity:1; transform:none; transition:none; } }

/* ============================================================
   SHARED COMPONENTS
   ============================================================ */
/* card grid */
.grid{ display:grid; gap:clamp(20px,2.4vw,30px); }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-2{ grid-template-columns:repeat(2,1fr); }
@media (max-width:900px){ .grid-3{ grid-template-columns:1fr; } .grid-2{ grid-template-columns:1fr; } }

.card{
  background:var(--paper); border:1px solid var(--line); border-radius:var(--radius-lg);
  padding:38px 34px; transition:transform .5s var(--ease), box-shadow .5s var(--ease), border-color .5s;
  position:relative; overflow:hidden;
}
.card:hover{ transform:translateY(-6px); box-shadow:0 30px 60px -34px rgba(12,19,34,.4); border-color:transparent; }
.card__no{ font-family:var(--mono); font-size:13px; font-weight:600; letter-spacing:.14em; color:var(--blue); }
.card__title{ font-family:var(--serif); font-weight:700; font-size:22px; margin:16px 0 6px; letter-spacing:.02em; }
.card__en{ font-family:var(--mono); font-size:12px; letter-spacing:.16em; color:var(--muted-2); text-transform:uppercase; }
.card__body{ font-size:14.5px; color:var(--ink-soft); line-height:1.95; margin-top:18px; }
.card__icon{
  width:68px; height:68px; border-radius:18px;
  display:flex; align-items:center; justify-content:center;
  background:linear-gradient(150deg, rgba(31,87,232,.1), rgba(43,212,238,.07));
  border:1px solid rgba(31,87,232,.15);
  color:var(--blue); margin-bottom:24px;
  transition:transform .55s var(--ease), box-shadow .55s var(--ease);
}
.card__icon svg{ width:38px; height:38px; }
.card:hover .card__icon{ transform:translateY(-3px) scale(1.04); box-shadow:0 14px 30px -14px rgba(31,87,232,.5); }

.tag{ display:inline-block; white-space:nowrap; font-family:var(--mono); font-size:11.5px; letter-spacing:.1em; text-transform:uppercase; color:var(--blue); background:rgba(31,87,232,.08); padding:5px 11px; border-radius:100px; font-weight:600; }

/* spec table */
.spec{ width:100%; border-top:1px solid var(--line); }
.spec dl{ display:grid; grid-template-columns:220px 1fr; border-bottom:1px solid var(--line); }
.spec dt{ font-weight:700; padding:24px 20px 24px 4px; font-size:14.5px; color:var(--ink); background:transparent; }
.spec dd{ padding:24px 4px; font-size:15px; color:var(--ink-soft); line-height:1.9; }
@media (max-width:640px){ .spec dl{ grid-template-columns:1fr; } .spec dd{ padding-top:0; } .spec dt{ padding-bottom:6px; } }

/* CTA band */
.cta-band{ background:var(--navy); color:#fff; position:relative; overflow:hidden; }
.cta-band canvas{ position:absolute; inset:0; opacity:.4; }
.cta-band .wrap{ position:relative; z-index:2; text-align:center; padding-block:clamp(64px,9vw,120px); }
.cta-band .h-section{ color:#fff; }
.cta-band .lead{ color:#bdcaE5; color:#bdcae5; margin:22px auto 36px; text-align:center; }
.cta-actions{ display:flex; gap:16px; justify-content:center; flex-wrap:wrap; }

/* utility */
.center{ text-align:center; }
.mt-s{ margin-top:16px; } .mt-m{ margin-top:28px; } .mt-l{ margin-top:48px; }
.flex{ display:flex; } .gap{ gap:16px; } .wrap-actions{ display:flex; gap:16px; flex-wrap:wrap; align-items:center; }