/* =========================================================
   株式会社トランスポーター (Transporter, Inc.) Corporate Site
   Design System — Near-White Sapphire / mRNA Molecular Science
   ========================================================= */

:root{
  /* near-white sapphire — the page background family */
  --bg-950:#d3e2f5;   /* deepest pale sapphire — veils, scrolled header */
  --bg-800:#dde8f7;   /* card / band tone — slightly deeper than the main bg */
  --bg-700:#eef3fb;   /* MAIN base — body background (near-white, sapphire tint) */
  --bg-600:#f6f9fd;   /* lightest tint — highlight blooms, near-pure white */

  /* dark navy text scale, tuned for AA contrast against --bg-700 */
  --ink-900:#10294a;  /* headings, primary text */
  --ink-800:#1f3a5f;  /* body copy */
  --ink-700:#3a5578;  /* secondary links / notes */
  --ink-500:#4a6690;  /* muted labels, de-emphasised text */

  /* vivid sapphire accent, distinct pop colour for eyebrows/icons/CTA */
  --accent-500:#1d4ed8;
  --accent-700:#163f7a; /* deeper sapphire — hover / stronger accent */

  /* isolated dark-navy surfaces (avatar chips) + their on-dark text */
  --surface-dark:#10294a;
  --on-dark:#ffffff;

  --gold-400:#d9b876; /* light gold — only ever used as text/icon ON --surface-dark */
  --gold-700:#6b4a12; /* dark bronze — gold-family text usable directly on the bright bg */

  --font-serif:"Noto Serif JP","Shippori Mincho",serif;
  --font-sans:"Noto Sans JP","Hiragino Kaku Gothic ProN",sans-serif;
  --font-display:"Cormorant Garamond","Noto Serif JP",serif;

  --max-w:1180px;
  --pad:clamp(20px,5vw,64px);
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--bg-700);
  color:var(--ink-800);
  font-family:var(--font-sans);
  line-height:1.9;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg,canvas{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;}
button{font-family:inherit;cursor:pointer;}

.container{
  max-width:var(--max-w);
  margin:0 auto;
  padding:0 var(--pad);
}

/* ---------- background texture (soft blooms + mRNA watermark, near-white sapphire) ---------- */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-color:var(--bg-700);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(255,255,255,.7), transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(29,78,216,.07), transparent 60%),
    url("../assets/images/mrna-watermark.svg");
  background-repeat:no-repeat, no-repeat, no-repeat;
  background-position:center, center, center 8%;
  background-size:auto, auto, min(1300px, 130vw) auto;
}

/* ---------- typography helpers ---------- */
.eyebrow{
  font-family:var(--font-display);
  font-style:italic;
  letter-spacing:.14em;
  font-size:14px;
  color:var(--accent-500);
  text-transform:uppercase;
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-bottom:18px;
}
.eyebrow::before{
  content:"";
  width:26px;height:1px;
  background:var(--accent-500);
  display:inline-block;
}
h1,h2,h3,h4{
  font-family:var(--font-serif);
  font-weight:600;
  color:var(--ink-900);
  letter-spacing:.01em;
}
h1{font-size:clamp(30px,4.4vw,52px);line-height:1.5;}
h2{font-size:clamp(24px,3.2vw,36px);line-height:1.55;}
h3{font-size:clamp(19px,2.2vw,23px);line-height:1.6;}
p{color:var(--ink-800);}
.lead{font-size:18px;color:var(--ink-800);}

.section{
  position:relative;
  padding:clamp(70px,11vw,130px) 0;
  z-index:1;
}
.section-alt{
  background:rgba(16,41,74,.04);
  border-top:1px solid rgba(16,41,74,.09);
  border-bottom:1px solid rgba(16,41,74,.09);
}
.section-head{
  max-width:720px;
  margin-bottom:52px;
}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.divider-line{
  width:1px;height:60px;
  background:linear-gradient(to bottom, transparent, var(--ink-500));
  margin:0 auto;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:12px;
  padding:15px 34px;
  border:1px solid var(--accent-500);
  color:var(--accent-500);
  font-size:14px;
  letter-spacing:.08em;
  border-radius:999px;
  background:rgba(29,78,216,.05);
  transition:all .4s var(--ease);
  position:relative;
  overflow:hidden;
}
.btn:hover{
  background:var(--accent-500);
  color:var(--on-dark);
  box-shadow:0 8px 28px rgba(29,78,216,.30);
}
.btn .arrow{transition:transform .4s var(--ease);}
.btn:hover .arrow{transform:translateX(4px);}k-500
.btn.ghost{border-color:var(--ink-700);color:var(--ink-900);}
.btn.ghost:hover{background:var(--surface-dark);color:var(--on-dark);border-color:var(--surface-dark);}

/* ============ HEADER ============ */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  padding:22px 0;
  transition:background .4s var(--ease), padding .4s var(--ease), border-color .4s var(--ease);
  border-bottom:1px solid transparent;
}
.site-header.scrolled{
  background:rgba(211,226,245,.92);
  backdrop-filter:blur(14px);
  padding:14px 0;
  border-color:rgba(16,41,74,.10);
}
.site-header .container{
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.logo{
  font-family:var(--font-display);
  font-size:24px;
  letter-spacing:.05em;
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--ink-900);
}
.logo .logo-img{
  height:64px;
  width:auto;
  display:block;
}
.logo small{
  font-family:var(--font-sans);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--ink-900);
  font-style:normal;
}
.logo .dot{color:var(--accent-500);}

.nav-desktop{
  display:flex;
  align-items:center;
  gap:42px;
}
.nav-desktop a{
  font-size:14px;
  letter-spacing:.04em;
  color:var(--ink-700);
  position:relative;
  padding:6px 0;
  transition:color .3s;
}
.nav-desktop a::after{
  content:"";
  position:absolute;left:0;bottom:0;
  width:0;height:1px;
  background:var(--accent-500);
  transition:width .35s var(--ease);
}
.nav-desktop a:hover,.nav-desktop a.active{color:var(--ink-900);}
.nav-desktop a:hover::after,.nav-desktop a.active::after{width:100%;}
.nav-desktop a.btn{color:var(--accent-500);}
.nav-desktop a.btn::after{display:none;}

.nav-toggle{
  display:none;
  width:40px;height:32px;
  position:relative;
  z-index:200;
  background:none;border:none;
}
.nav-toggle span{
  position:absolute;left:0;right:0;height:1px;background:var(--ink-900);
  transition:all .35s var(--ease);
}
.nav-toggle span:nth-child(1){top:6px;}
.nav-toggle span:nth-child(2){top:16px;}
.nav-toggle span:nth-child(3){top:26px;}
.nav-toggle.open span:nth-child(1){top:16px;transform:rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){top:16px;transform:rotate(-45deg);}

.nav-mobile{
  position:fixed;inset:0;
  background:var(--bg-700);
  z-index:150;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:34px;
  transform:translateY(-100%);
  opacity:0;
  transition:transform .5s var(--ease), opacity .5s var(--ease);
  visibility:hidden;
}
.nav-mobile.open{transform:translateY(0);opacity:1;visibility:visible;}
.nav-mobile a{font-family:var(--font-serif);font-size:26px;color:var(--ink-900);}

/* ============ HERO ============ */
.hero{
  position:relative;
  min-height:100vh;
  display:flex;
  align-items:center;
  overflow:hidden;
  padding-top:120px;
  padding-bottom:80px;
}
.hero-canvas{
  position:absolute;inset:0;
  z-index:0;
  opacity:.85;
}
.hero-veil{
  position:absolute;inset:0;
  z-index:0;
  background:linear-gradient(180deg, rgba(211,226,245,.05) 0%, rgba(211,226,245,.35) 70%, var(--bg-800) 100%);
}
.hero .container{position:relative;z-index:2;text-align:center;}
.hero h1{
  margin:0 auto 28px;
  max-width:1000px;
}
.hero h1 .accent{color:var(--accent-500);}
.hero .lead{
  max-width:860px;
  margin:0 auto 40px;
  font-size:16px;
}
.hero-cta{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;}
.hero-note{
  margin-top:60px;
  font-family:var(--font-display);
  font-style:italic;
  color:var(--ink-500);
  font-size:14px;
  letter-spacing:.06em;
}

/* ============ HERITAGE ============ */
.heritage-panel{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  gap:60px;
  align-items:center;
}
.heritage-visual{
  aspect-ratio:1/1;
  position:relative;
  border-radius:50%;
  border:1px solid rgba(16,41,74,.14);
}
.heritage-text p + p{margin-top:20px;}

/* ============ ACCORDION ITEMS ============
   Used across all four pages for "click to see details" sections.
   Progressive enhancement: on the server / no-JS render, .acc-panel is
   fully visible (max-height:none). Only once js/main.js runs and adds
   the "js" class to <html> do panels collapse and animate open/closed
   via inline max-height, toggled on .acc-item.is-open. */
.acc-list{display:flex;flex-direction:column;gap:16px;}
.acc-item{
  border:1px solid rgba(16,41,74,.16);
  background:rgba(16,41,74,.03);
  transition:border-color .35s var(--ease), background .35s var(--ease);
}
.acc-item.is-open{
  border-color:rgba(29,78,216,.45);
  background:rgba(29,78,216,.055);
}
.acc-btn{
  width:100%;
  display:flex;
  align-items:center;
  gap:20px;
  padding:24px 26px;
  background:none;
  border:none;
  text-align:left;
  color:inherit;
}
.acc-btn .acc-icon{
  width:46px;height:46px;
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:20px;
  background:rgba(29,78,216,.08);
  border:1px solid rgba(29,78,216,.30);
  flex-shrink:0;
}
.acc-btn .acc-avatar{
  width:64px;height:64px;
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-display);
  font-size:20px;
  color:var(--gold-400);
  background:linear-gradient(150deg,var(--ink-800),var(--surface-dark));
  border:1px solid rgba(217,184,118,.35);
  flex-shrink:0;
  overflow:hidden;
}
.acc-avatar-photo img{
  width:100%;
  height:100%;
  object-fit:cover;
  border-radius:50%;
}
.acc-head{flex:1;display:flex;flex-direction:column;gap:5px;min-width:0;}
.acc-eyebrow{
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--accent-500);
  text-transform:uppercase;
}
.acc-title{
  font-family:var(--font-serif);
  color:var(--ink-900);
  font-size:17.5px;
  font-weight:600;
}
.acc-teaser{font-size:13.5px;color:var(--ink-500);}
.acc-plus{
  width:24px;height:24px;
  position:relative;
  flex-shrink:0;
}
.acc-plus::before,.acc-plus::after{
  content:"";
  position:absolute;
  background:var(--accent-500);
  transition:transform .35s var(--ease), opacity .35s var(--ease);
}
.acc-plus::before{width:100%;height:1.5px;top:50%;left:0;transform:translateY(-50%);}
.acc-plus::after{height:100%;width:1.5px;left:50%;top:0;transform:translateX(-50%);}
.acc-item.is-open .acc-plus::after{opacity:0;transform:translateX(-50%) rotate(90deg);}

.acc-panel{
  overflow:hidden;
  transition:max-height .45s var(--ease);
  max-height:none;
}
html.js .acc-panel{max-height:0;}
.acc-panel-inner{padding:0 26px 26px 26px;}
.acc-panel-inner p + p{margin-top:14px;}
.acc-panel-inner .kv{display:grid;grid-template-columns:96px 1fr;gap:10px;margin-top:6px;}
.acc-panel-inner .kv dt{color:var(--ink-500);font-size:12.5px;letter-spacing:.05em;padding-top:2px;}
.acc-panel-inner .kv dd{color:var(--ink-800);font-size:14.5px;line-height:1.8;}

/* ---------- figure placeholder (for later image insertion) ---------- */
.figure-placeholder{
  margin-top:18px;
  padding:14px;
  border:1px dashed rgba(16,41,74,.30);
  background:rgba(16,41,74,.03);
}
.figure-placeholder img{
  width:100%;
  border-radius:2px;
  display:block;
  background:var(--bg-800);
}
.figure-placeholder figcaption{
  margin-top:10px;
  font-size:12px;
  color:var(--ink-500);
  line-height:1.7;
}
.figure-placeholder figcaption code{
  color:var(--ink-900);
  background:rgba(16,41,74,.07);
  padding:1px 6px;
  border-radius:2px;
  font-size:11.5px;
}

/* ============ TIMELINE (Story) ============ */
.timeline{
  position:relative;
  padding-left:34px;
  border-left:1px solid rgba(16,41,74,.18);
}
.timeline-marker{
  position:relative;
  margin-bottom:28px;
}
.timeline-marker:last-child{margin-bottom:0;}
.timeline-marker::before{
  content:"";
  position:absolute;
  left:-40px;top:26px;
  width:10px;height:10px;
  border-radius:50%;
  background:var(--accent-500);
  border:2px solid var(--bg-600);
}
.timeline-year{
  font-family:var(--font-display);
  color:var(--accent-500);
  font-size:19px;
  letter-spacing:.03em;
  margin-right:14px;
}

/* ============ QUOTE / FOUNDER ============ */
.founder-block{
  display:grid;
  grid-template-columns:.85fr 1.15fr;
  gap:60px;
  align-items:start;
}
.founder-visual{position:relative;}
.quote-mark{
  font-family:var(--font-display);
  font-size:80px;
  color:var(--accent-500);
  opacity:.55;
  line-height:1;
  margin-bottom:10px;
}
blockquote{
  font-family:var(--font-serif);
  font-size:clamp(20px,2.3vw,26px);
  color:var(--ink-900);
  line-height:1.7;
  border-left:2px solid var(--accent-500);
  padding-left:26px;
  margin-bottom:30px;
}
.founder-name{
  display:flex;
  align-items:center;
  gap:16px;
  margin-top:32px;
}
.founder-name .role{
  font-size:13px;
  color:var(--ink-500);
  letter-spacing:.03em;
}
.founder-name .name{
  font-family:var(--font-serif);
  color:var(--ink-900);
  font-size:17px;
}

/* ============ CORE TECHNOLOGY CALLOUT (Technology) ============ */
.signal-callout{
  margin-top:36px;
  padding:26px 30px;
  background:rgba(29,78,216,.05);
  border:1px solid rgba(29,78,216,.24);
  font-family:var(--font-serif);
  color:var(--ink-900);
  font-size:15.5px;
}

/* ============ COMPANY INFO TABLE ============ */
.info-table{width:100%;border-collapse:collapse;}
.info-table tr{border-bottom:1px solid rgba(16,41,74,.14);}
.info-table tr:first-child{border-top:1px solid rgba(16,41,74,.14);}
.info-table th{
  text-align:left;
  padding:20px 30px 20px 0;
  width:200px;
  font-size:13px;
  letter-spacing:.05em;
  color:var(--ink-500);
  font-weight:500;
  vertical-align:top;
}
.info-table td{
  padding:20px 0;
  color:var(--ink-800);
  font-size:15px;
}

.alliance-box{
  margin-top:40px;
  padding:32px;
  border:1px solid rgba(107,74,18,.3);
  background:rgba(107,74,18,.045);
}
.alliance-box .eyebrow{color:var(--gold-700);}
.alliance-box .eyebrow::before{background:var(--gold-700);}

/* ---------- small inline note text (e.g. image-replacement instructions) ---------- */
.form-note{font-size:12.5px;color:var(--ink-700);margin-top:20px;line-height:1.7;}

/* ============ FOOTER ============ */
.site-footer{
  border-top:1px solid rgba(16,41,74,.14);
  padding:60px 0 34px;
  position:relative;
  z-index:1;
}
.footer-top{
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:40px;
  padding-bottom:40px;
  border-bottom:1px solid rgba(16,41,74,.12);
  margin-bottom:26px;
}
.footer-nav{display:flex;gap:34px;flex-wrap:wrap;}
.footer-nav a{font-size:14px;color:var(--ink-700);}
.footer-nav a:hover{color:var(--accent-500);}
.footer-bottom{
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:12px;
  font-size:12.5px;
  color:var(--ink-700);
}
.footer-tagline{
  max-width:420px;
  font-size:13px;
  color:var(--ink-500);
  margin-top:14px;
}

/* ============ reveal animation ============
   Progressive enhancement: content is fully visible by default so it
   never depends on JavaScript. Only when the "js" class is present on
   <html> (set by an inline script, see <head>) do .reveal items start
   hidden and fade in via IntersectionObserver in js/main.js. */
.reveal{
  transition:opacity .9s var(--ease), transform .9s var(--ease);
}
html.js .reveal{
  opacity:0;
  transform:translateY(26px);
}
html.js .reveal.is-visible{opacity:1;transform:translateY(0);}

/* ============ page hero (sub pages) ============ */
.page-hero{
  padding:170px 0 70px;
  position:relative;
  overflow:hidden;
}
.page-hero .container{position:relative;z-index:2;}
.page-hero-visual{
  position:absolute;
  inset:0;
  z-index:0;
  opacity:.55;
}

/* ============ responsive ============ */
@media (max-width:980px){
  .heritage-panel,.founder-block{grid-template-columns:1fr;gap:40px;}
  .heritage-visual{max-width:320px;margin:0 auto;}
}
@media (max-width:760px){
  .nav-desktop{display:none;}
  .nav-toggle{display:block;}
  .info-table th{width:120px;padding-right:14px;}
  .footer-top{flex-direction:column;}
  .acc-btn{padding:20px;gap:14px;}
  .acc-panel-inner{padding:0 20px 22px 20px;}
  .acc-panel-inner .kv{grid-template-columns:1fr;gap:4px;}
}