/* ============================================================
   ZEROID — EN4 · "SWISS CLINICAL"
   International Typographic Style × Derma Lab
   ------------------------------------------------------------
   · Single stylesheet, CSS custom properties, no frameworks
   · White paper, ink-navy type, ZEROID brand navy accent (국문 사이트 기준)
   · 1px rules expose the grid; square corners; no shadows
   ------------------------------------------------------------
   INDEX
   00 · Fonts & design tokens
   01 · Reset & base
   02 · Utilities (wrap, mono labels, notes, skip link)
   03 · Header & navigation
   04 · Hero — typographic (index)
   05 · Page hero (subpages) & figures
   07 · Section heads (numbering system)
   08 · Bordered cell grids & cards
   09 · Product line cards & spec-sheet rows
   10 · Split sections
   11 · Data tables (spec / timeline / contact)
   12 · Science steps
   13 · FAQ accordion
   14 · CTA band (inverted)
   15 · Buttons & links
   16 · Footer — sitemap index table
   17 · Reveal & motion
   18 · Responsive
   19 · Reduced motion & print
   ============================================================ */

/* ---- 00 · Fonts & design tokens ---------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  /* Brand palette — aligned with zeroid.co.kr (Korean site) */
  --paper:#ffffff;
  --paper-soft:#F4F6FA;        /* pale blue-grey ground */
  --ink:#303A4B;               /* ink navy — body text & inverted panels */
  --ink-60:rgba(48,58,75,.72);
  --ink-40:rgba(48,58,75,.58);
  --accent:#284AA4;            /* ZEROID brand navy */
  --accent-deep:#1A3D79;       /* navy, pressed/hover depth */
  --muted:#89919E;             /* grey blue */
  --line:#C9D3E3;              /* 1px structural rules — soft blue-grey */
  --line-soft:rgba(48,58,75,.12);
  --logo-ink:#5F5E5E;          /* CI wordmark grey (국문 CI 기준) */

  --font-sans:"Space Grotesk","Pretendard","Noto Sans KR","Malgun Gothic",
              -apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
  --font-mono:"IBM Plex Mono","Pretendard","Noto Sans KR","Malgun Gothic",
              ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --wrap-max:1480px;
  --pad-x:clamp(20px,4vw,64px);
  --sec-pad:clamp(56px,9vw,128px);

  --ease:cubic-bezier(.16,1,.3,1);
  --dur:.4s;                   /* fast & dry */
}

/* ---- 01 · Reset & base ------------------------------------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:var(--paper);
  color:var(--ink);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4{font-weight:600;letter-spacing:-.03em;line-height:1.05}
em{font-style:normal;color:var(--accent)}
strong{font-weight:600}
::selection{background:var(--accent);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* ---- 02 · Utilities ---------------------------------------- */
.wrap{max-width:var(--wrap-max);margin-inline:auto;padding-inline:var(--pad-x)}

.mono{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  text-transform:uppercase;
}
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--accent);
}
.note{
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.7;
  color:var(--ink-60);
  border-top:1px solid var(--line);
  padding-top:16px;
  margin-top:40px;
}
.note a{color:var(--accent)}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:300;
  font-family:var(--font-mono);font-size:12px;text-transform:uppercase;
  background:var(--ink);color:#fff;padding:12px 20px;
}
.skip-link:focus{left:0}

.progress-line{
  position:fixed;top:0;left:0;z-index:210;
  width:100%;height:2px;background:var(--accent);
  transform:scaleX(0);transform-origin:left;
  pointer-events:none;
}

/* Section separators: every top-level section draws one rule */
main > section{border-top:1px solid var(--line)}
main > section:first-child{border-top:0}
.section{padding-block:var(--sec-pad)}

/* ---- 03 · Header & navigation ------------------------------ */
.site-header{
  position:sticky;top:0;z-index:120;
  background:var(--paper);
  border-bottom:1px solid var(--line);
}
.header-bar{
  display:flex;align-items:stretch;gap:0;
  min-height:64px;
}
.brand-logo{
  display:flex;align-items:center;
  font-weight:700;font-size:22px;letter-spacing:-.02em;
  color:var(--logo-ink);
  padding-right:clamp(20px,3vw,48px);
  border-right:1px solid var(--line);
}
/* Official CI wordmark (assets/logo.png · 151×26) — do not recolour or distort.
   Capped at native height so it never upscales. Alt text renders if unavailable. */
.brand-logo img{
  display:block;
  height:clamp(20px,2vw,26px);
  width:auto;
}

.header-nav{display:flex;align-items:stretch;flex:1}
.nav-menu{display:flex;align-items:stretch}
.nav-menu li{display:flex}
.nav-menu a{
  display:flex;align-items:center;gap:8px;
  padding:0 clamp(12px,1.6vw,24px);
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.1em;text-transform:uppercase;
  position:relative;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-menu a .no{color:var(--accent);font-size:10px}
.nav-menu a:hover{background:var(--ink);color:#fff}
.nav-menu a[aria-current="page"]{background:var(--ink);color:#fff}
.nav-menu a[aria-current="page"] .no{color:var(--accent)}

.nav-cta{
  margin-left:auto;
  display:flex;align-items:stretch;
  border-left:1px solid var(--line);
}
.lang-pill{
  display:flex;align-items:center;
  padding:0 20px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  border-right:1px solid var(--line);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.lang-pill:hover{background:var(--ink);color:#fff}
.nav-cta .btn{border:0;border-left:0}

.nav-toggle{
  display:none;
  width:64px;
  border-left:1px solid var(--line);
  flex-direction:column;align-items:center;justify-content:center;gap:6px;
}
.nav-toggle span{
  display:block;width:24px;height:2px;background:var(--ink);
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.site-header.open .nav-toggle span:nth-child(1){transform:translateY(8px) rotate(45deg)}
.site-header.open .nav-toggle span:nth-child(2){opacity:0}
.site-header.open .nav-toggle span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

/* ---- 04 · Hero — typographic (index) ----------------------- */
.hero{
  padding-top:clamp(40px,6vw,88px);
  background:linear-gradient(180deg,var(--paper-soft) 0%,var(--paper) 78%);
}
.hero-meta{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 24px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ink-60);
  border-bottom:1px solid var(--line);
  padding-bottom:14px;
}
.hero-meta .dot::before{content:"";display:inline-block;width:8px;height:8px;background:var(--accent);margin-right:10px;vertical-align:baseline}
.hero h1{
  font-size:clamp(3.1rem,10.5vw,9rem);
  line-height:.94;
  letter-spacing:-.03em;
  text-transform:uppercase;
  margin:clamp(28px,5vw,60px) 0;
  max-width:14ch;
}
.hero-cols{
  display:grid;grid-template-columns:1.15fr .85fr;
  border-top:1px solid var(--line);
}
.hero-cols > div{padding:clamp(24px,3.4vw,48px) 0}
.hero-cols > div:first-child{border-right:1px solid var(--line);padding-right:clamp(24px,4vw,64px)}
.hero-cols > div:last-child{padding-left:clamp(24px,4vw,64px)}
.hero-lead{
  font-size:clamp(16px,1.4vw,19px);
  line-height:1.7;color:var(--ink-60);
  max-width:56ch;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}

.hero-stats{width:100%}
.hero-stats > div{
  display:flex;align-items:baseline;justify-content:space-between;gap:24px;
  padding:18px 0;
  border-bottom:1px solid var(--line);
}
.hero-stats > div:first-child{padding-top:0}
.hero-stats dt{
  font-size:clamp(2rem,3.4vw,3.2rem);
  font-weight:600;letter-spacing:-.03em;line-height:1;
}
.hero-stats dd{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink-60);text-align:right;
}

.hero-figure{
  display:grid;grid-template-columns:2fr 1fr;
  border-top:1px solid var(--line);
  margin-top:clamp(32px,5vw,64px);
}
.hero-figure img{
  width:100%;height:100%;min-height:260px;max-height:440px;
  object-fit:cover;
  border-right:1px solid var(--line);
}
.hero-figure figcaption{
  display:flex;flex-direction:column;justify-content:center;gap:12px;
  padding:clamp(24px,3vw,44px);
}
.hero-figure figcaption strong{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--accent);font-weight:500;
}
.hero-figure figcaption p{color:var(--ink-60);font-size:15px;line-height:1.7}

/* ---- 05 · Page hero (subpages) & figures ------------------- */
.page-hero{
  padding-top:clamp(40px,6vw,80px);
  background:linear-gradient(180deg,var(--paper-soft) 0%,var(--paper) 82%);
}
.crumbs{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink-60);
  border-bottom:1px solid var(--line);
  padding-bottom:14px;
  display:flex;flex-wrap:wrap;gap:8px 14px;
}
.crumbs a{color:var(--ink)}
.crumbs a:hover{color:var(--accent)}
.crumbs .sep{color:var(--ink-40)}
.crumbs .pg-no{margin-left:auto;color:var(--accent)}
.page-hero h1{
  font-size:clamp(2.7rem,8vw,7rem);
  line-height:.95;text-transform:uppercase;
  margin:clamp(24px,4.4vw,52px) 0 clamp(18px,2.4vw,28px);
  max-width:16ch;
}
.page-hero .lead{
  font-size:clamp(16px,1.4vw,19px);line-height:1.7;
  color:var(--ink-60);max-width:64ch;
  padding-bottom:clamp(32px,5vw,64px);
}
/* <picture> 래퍼 — WebP/JPEG 폴백 구조가 기존 img 레이아웃을 그대로 따르도록 */
picture{display:block;height:100%}
picture > img{display:block}

.page-figure{border-top:1px solid var(--line)}
.page-figure img{
  width:100%;height:clamp(240px,38vw,440px);object-fit:cover;
}
.page-figure figcaption{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink-60);
  border-top:1px solid var(--line);
  padding:12px 0;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
}

/* ---- 07 · Section heads (numbering system) ------------------ */
.sec-head{margin-bottom:clamp(36px,5vw,64px)}
.sec-meta{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  text-transform:uppercase;
  border-bottom:1px solid var(--line);
  padding-bottom:12px;
  margin-bottom:clamp(20px,3vw,40px);
}
.sec-no{color:var(--accent)}
.sec-label{color:var(--ink-60)}
.sec-title{
  font-size:clamp(2rem,4.6vw,4rem);
  text-transform:uppercase;
  max-width:22ch;
}
.sec-lead{
  margin-top:20px;
  font-size:clamp(15px,1.3vw,18px);line-height:1.75;
  color:var(--ink-60);max-width:62ch;
}

/* ---- 08 · Bordered cell grids & cards ----------------------- */
.cell-grid{
  display:grid;
  border:1px solid var(--line);
  border-right:0;border-bottom:0;
}
.cols-3{grid-template-columns:repeat(3,1fr)}
.cell-grid > *{
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.cell{
  padding:clamp(24px,2.6vw,40px);
  display:flex;flex-direction:column;gap:14px;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.cell .cell-no{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  color:var(--accent);
}
.cell h3{font-size:clamp(18px,1.6vw,22px);text-transform:uppercase;letter-spacing:-.01em}
.cell p{font-size:15px;line-height:1.7;color:var(--ink-60)}
.cell:hover{background:var(--ink);color:#fff}
.cell:hover p{color:rgba(255,255,255,.72)}

/* ---- 09 · Product line cards & spec-sheet rows -------------- */
.line-grid{
  display:grid;grid-template-columns:repeat(3,1fr);
  border:1px solid var(--line);border-right:0;border-bottom:0;
}
.line-card{
  display:flex;flex-direction:column;
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.line-thumb{
  aspect-ratio:4/3;
  display:flex;align-items:center;justify-content:center;
  background:var(--paper);
  border-bottom:1px solid var(--line);
  padding:28px;
}
.line-thumb img{max-height:100%;width:auto;max-width:100%;object-fit:contain}
.line-body{padding:clamp(20px,2.2vw,32px);display:flex;flex-direction:column;gap:10px;flex:1}
.line-tag{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--accent);
}
.line-card h3{font-size:20px;text-transform:uppercase}
.line-card p{font-size:14px;line-height:1.65;color:var(--ink-60)}
.line-for{
  margin-top:auto;padding-top:16px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink-60);
  border-top:1px solid var(--line-soft);
}
a.line-card:hover{background:var(--ink);color:#fff}
a.line-card:hover p,a.line-card:hover .line-for{color:rgba(255,255,255,.7)}
a.line-card:hover .line-for{border-top-color:rgba(255,255,255,.3)}

/* Spec-sheet rows — products page */
.spec-list{border-top:1px solid var(--line)}
.spec-row{
  display:grid;
  grid-template-columns:72px 200px 1fr 240px;
  border-bottom:1px solid var(--line);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.spec-row > *{
  padding:clamp(20px,2.4vw,36px);
  border-right:1px solid var(--line);
  min-width:0;
}
.spec-row > *:last-child{border-right:0}
.spec-no{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:var(--accent);padding-left:0;
}
.spec-thumb{
  display:flex;align-items:center;justify-content:center;
  background:var(--paper);
}
.spec-thumb img{max-height:150px;width:auto;max-width:100%;object-fit:contain}
.spec-body .line-tag{display:block;margin-bottom:8px}
.spec-body h3{font-size:clamp(20px,2vw,26px);text-transform:uppercase;margin-bottom:10px}
.spec-body p{font-size:15px;line-height:1.7;color:var(--ink-60);max-width:56ch}
.spec-for{
  display:flex;align-items:flex-end;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink-60);line-height:1.8;
}
.spec-row:hover{background:var(--ink);color:#fff}
.spec-row:hover .spec-body p,.spec-row:hover .spec-for{color:rgba(255,255,255,.7)}
.spec-row:hover .spec-thumb{background:var(--paper)}

/* ---- 10 · Split sections ------------------------------------ */
.split{
  display:grid;grid-template-columns:1fr 1fr;
  border-top:1px solid var(--line);
}
.split > *{padding:clamp(24px,3.4vw,52px) 0;min-width:0}
.split > *:first-child{border-right:1px solid var(--line);padding-right:clamp(24px,4vw,64px)}
.split > *:last-child{padding-left:clamp(24px,4vw,64px)}
.split img{width:100%;height:100%;object-fit:cover}
.split .img-cell{padding:0;border-right:0}
.split > .img-cell:first-child{padding:0;border-right:1px solid var(--line)}
.split > .img-cell:last-child{padding:0}
.split h3{font-size:clamp(20px,2vw,26px);text-transform:uppercase;margin-bottom:14px}
.split p{font-size:15.5px;line-height:1.75;color:var(--ink-60)}
.split p + p{margin-top:14px}

/* ---- 11 · Data tables --------------------------------------- */
.data-table{
  width:100%;border-collapse:collapse;
  border-top:1px solid var(--line);
}
.data-table tr{
  border-bottom:1px solid var(--line);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.data-table th{
  text-align:left;vertical-align:top;
  font-size:clamp(1.4rem,2.4vw,2.1rem);
  font-weight:600;letter-spacing:-.02em;line-height:1.1;
  padding:clamp(18px,2vw,28px) 24px clamp(18px,2vw,28px) 0;
  width:140px;white-space:nowrap;
}
.data-table td{
  padding:clamp(18px,2vw,28px) 0;
  font-size:15.5px;line-height:1.7;color:var(--ink-60);
  vertical-align:middle;
}
.data-table td .mono-cell{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--accent);display:block;margin-bottom:6px;
}
.data-table tbody tr:hover{background:var(--ink);color:#fff}
.data-table tbody tr:hover td{color:rgba(255,255,255,.72)}
.data-table tbody tr:hover th{color:#fff}
.data-table tbody tr:hover{padding-inline:12px}
.data-table th,.data-table td{padding-left:12px}
.sr-only{
  position:absolute;width:1px;height:1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;
}

/* Contact / spec key-value table */
.kv-table{width:100%;border-collapse:collapse;border-top:1px solid var(--line)}
.kv-table tr{border-bottom:1px solid var(--line)}
.kv-table th{
  text-align:left;vertical-align:top;width:220px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  text-transform:uppercase;font-weight:500;color:var(--accent);
  padding:20px 24px 20px 12px;white-space:nowrap;
}
.kv-table td{padding:20px 12px;font-size:15.5px;line-height:1.7;color:var(--ink-60)}
.kv-table td a{color:var(--ink);border-bottom:1px solid var(--line)}
.kv-table td a:hover{color:var(--accent);border-color:var(--accent)}

/* ---- 12 · Science steps ------------------------------------- */
.science-steps{border-top:1px solid var(--line)}
.science-step{
  display:grid;grid-template-columns:110px 1fr;
  border-bottom:1px solid var(--line);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.science-step .num{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;
  color:var(--accent);
  padding:clamp(20px,2.4vw,32px) 12px;
  border-right:1px solid var(--line);
}
.science-step .step-body{padding:clamp(20px,2.4vw,32px) clamp(16px,2vw,32px)}
.science-step h3{font-size:clamp(17px,1.6vw,21px);text-transform:uppercase;margin-bottom:8px}
.science-step p{font-size:15px;line-height:1.7;color:var(--ink-60);max-width:66ch}
.science-step:hover{background:var(--ink);color:#fff}
.science-step:hover p{color:rgba(255,255,255,.72)}

/* ---- 13 · FAQ accordion ------------------------------------- */
.faq{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  display:flex;align-items:baseline;gap:20px;width:100%;
  text-align:left;
  padding:clamp(20px,2.4vw,30px) 12px;
  font-size:clamp(16px,1.5vw,20px);font-weight:600;letter-spacing:-.01em;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.faq-q::before{
  content:attr(data-no);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  font-weight:400;color:var(--accent);
  flex:0 0 44px;
}
.faq-q::after{
  content:"+";
  margin-left:auto;
  font-family:var(--font-mono);font-size:18px;font-weight:400;
  color:var(--accent);
  transition:transform var(--dur) var(--ease);
}
.faq-item.open .faq-q::after{content:"–"}
.faq-q:hover{background:var(--ink);color:#fff}
.faq-a{
  overflow:hidden;max-height:0;
  transition:max-height .35s var(--ease);
}
.faq-a p{
  padding:0 12px clamp(20px,2.4vw,30px) 76px;
  font-size:15px;line-height:1.75;color:var(--ink-60);
  max-width:72ch;
}
.faq-a a{color:var(--accent);border-bottom:1px solid var(--accent)}

/* ---- 14 · CTA band (inverted) -------------------------------- */
.cta-band{background:var(--ink);color:#fff}
.cta-band .sec-meta{border-bottom-color:rgba(255,255,255,.3)}
.cta-band .sec-label{color:rgba(255,255,255,.6)}
.cta-band h2{
  font-size:clamp(1.9rem,4.6vw,3.8rem);
  text-transform:uppercase;max-width:24ch;
}
.cta-band p{
  margin-top:18px;font-size:clamp(15px,1.3vw,18px);
  color:rgba(255,255,255,.68);max-width:60ch;line-height:1.7;
}
.cta-band .hero-actions{margin-top:36px}

/* ---- 15 · Buttons & links ------------------------------------ */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:16px 28px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;
  border:1px solid var(--line);
  background:transparent;color:var(--ink);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn svg{width:14px;height:14px;flex:0 0 auto}
.btn--primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn--primary:hover{background:var(--accent-deep);border-color:var(--accent-deep);color:#fff}
.btn--ghost{border-color:var(--accent);color:var(--accent)}
.btn--ghost:hover{background:var(--accent);color:#fff}
.btn--light{background:#fff;color:var(--accent);border-color:#fff}
.btn--light:hover{background:var(--accent-deep);border-color:var(--accent-deep);color:#fff}
.cta-band .btn--ghost{color:#fff;border-color:rgba(255,255,255,.5)}
.cta-band .btn--ghost:hover{background:#fff;color:var(--ink);border-color:#fff}

/* Underline-slide text link */
.go{
  display:inline-block;position:relative;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  text-transform:uppercase;
  padding-bottom:4px;
}
.go::after{
  content:"";position:absolute;left:0;bottom:0;
  width:100%;height:1px;background:currentColor;
  transform:scaleX(0);transform-origin:right;
  transition:transform var(--dur) var(--ease);
}
.go:hover::after,.cell:hover .go::after{transform:scaleX(1);transform-origin:left}

/* ---- 16 · Footer — sitemap index table ----------------------- */
.site-footer{border-top:1px solid var(--line)}
.footer-mark{
  padding:clamp(28px,5vw,56px) 0 clamp(20px,3vw,40px);
  border-bottom:1px solid var(--line);
}
.footer-mark .brand-logo{
  border:0;padding:0;
  font-size:clamp(2.4rem,7vw,4.4rem);
  line-height:.9;letter-spacing:-.04em;font-weight:700;
  color:var(--logo-ink);
}
/* CI is used at its native 151×26 — never stretched to fill the column. */
.footer-mark .brand-logo img{
  height:26px;
  width:151px;
}
.footer-tag{
  margin-top:14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--ink-60);
}
.footer-index{width:100%;border-collapse:collapse}
.footer-index tr{
  border-bottom:1px solid var(--line);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.footer-index td{padding:16px 12px;vertical-align:middle}
.footer-index .fi-no{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:var(--accent);width:64px;
}
.footer-index .fi-title a{
  font-size:clamp(16px,1.6vw,20px);font-weight:600;
  text-transform:uppercase;letter-spacing:-.01em;
}
.footer-index .fi-sub{
  text-align:right;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink-60);
}
.footer-index .fi-sub a:hover{color:var(--accent)}
.footer-index tr:hover{background:var(--ink);color:#fff}
.footer-index tr:hover .fi-sub{color:rgba(255,255,255,.65)}

.footer-cols{
  display:grid;grid-template-columns:1.2fr 1fr 1fr;
  border-top:1px solid var(--line);
}
.footer-cols > div{
  padding:clamp(24px,3vw,44px) clamp(16px,2vw,32px) clamp(24px,3vw,44px) 12px;
  border-right:1px solid var(--line);
}
.footer-cols > div:last-child{border-right:0}
.footer-cols h4{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;font-weight:500;color:var(--accent);
  margin-bottom:16px;
}
.footer-cols p{font-size:14px;line-height:1.75;color:var(--ink-60)}
.footer-cols p + p{margin-top:10px}
.footer-cols a{border-bottom:1px solid var(--line-soft)}
.footer-cols a:hover{color:var(--accent);border-color:var(--accent)}
.footer-legal strong{color:var(--ink)}

.footer-bottom{
  border-top:1px solid var(--line);
  padding:18px 0 clamp(24px,3vw,40px);
  display:flex;flex-wrap:wrap;gap:8px 32px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--ink-60);
}
.footer-bottom a{text-decoration:underline;text-underline-offset:3px}
.footer-bottom a:hover{color:var(--accent)}
.footer-bottom .disclaimer{flex-basis:100%;color:var(--ink-40)}

/* ---- 17 · Reveal & motion ------------------------------------ */
.reveal{
  opacity:0;transform:translateY(14px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.reveal.in{opacity:1;transform:none}

/* ---- 18 · Responsive ----------------------------------------- */
@media (max-width:1100px){
  .nav-menu a .no{display:none}
}
@media (max-width:1000px){
  .header-bar{min-height:60px;justify-content:space-between}
  .brand-logo{border-right:0}
  .nav-toggle{display:flex}
  .header-nav{
    position:absolute;top:100%;left:0;right:0;
    background:var(--paper);
    border-bottom:1px solid var(--line);
    display:none;
  }
  .site-header.open .header-nav{display:block}
  .nav-menu{flex-direction:column;align-items:stretch}
  .nav-menu li{display:block;border-top:1px solid var(--line)}
  .nav-menu a{padding:18px var(--pad-x);font-size:14px;justify-content:flex-start}
  .nav-menu a .no{display:inline}
  .nav-cta{border-left:0}
  .nav-cta .btn{display:none}
  .lang-pill{border-right:0;border-left:1px solid var(--line)}

  .hero-cols,.split{grid-template-columns:1fr}
  .hero-cols > div:first-child,.split > *:first-child{
    border-right:0;border-bottom:1px solid var(--line);padding-right:0;
  }
  .hero-cols > div:last-child,.split > *:last-child{padding-left:0}
  .split > .img-cell:first-child{border-right:0}
  .hero-figure{grid-template-columns:1fr}
  .hero-figure img{border-right:0;border-bottom:1px solid var(--line);max-height:320px}

  .cols-3,.line-grid{grid-template-columns:repeat(2,1fr)}
  .footer-cols{grid-template-columns:1fr}
  .footer-cols > div{border-right:0;border-bottom:1px solid var(--line);padding-right:12px}
  .footer-cols > div:last-child{border-bottom:0}

  .spec-row{grid-template-columns:64px 1fr}
  .spec-thumb{border-right:0}
  .spec-body{grid-column:1 / -1;border-right:0;border-top:1px solid var(--line)}
  .spec-for{grid-column:1 / -1;border-right:0;border-top:1px solid var(--line);padding-top:16px;padding-bottom:16px}
}
@media (max-width:640px){
  .cols-3,.line-grid{grid-template-columns:1fr}
  .data-table th{width:90px;font-size:1.2rem}
  .kv-table th{width:130px;white-space:normal}
  .faq-q::before{flex-basis:32px}
  .faq-a p{padding-left:56px}
  .science-step{grid-template-columns:64px 1fr}
  .footer-index .fi-sub{display:none}
  .hero-meta span:nth-child(3){display:none}
}

/* ---- 19 · Reduced motion & print ------------------------------ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .reveal{opacity:1;transform:none}
  .progress-line{display:none}
}
@media print{
  .site-header,.progress-line,.nav-toggle{display:none}
  main > section{border-top-color:#ccc}
}