/* ════════════════════════════════════════════════════════════════
   fluxdepo.com — one stylesheet for every page
   v10: one dark surface from top to bottom, no light/dark switching.

   1  tokens          6  hero + facts      11 products
   2  base            7  film band         12 company / history
   3  type            8  applications      13 insights strip + contact
   4  buttons         9  cell (explode)    14 footer, root chooser
   5  header         10  anode, deposition 15 insight pages · 16 Korean · 17 motion
   ════════════════════════════════════════════════════════════════ */

@font-face{
  font-family:'Archivo';
  font-style:normal;
  font-display:swap;
  font-weight:100 900;
  font-stretch:62% 125%;
  src:url(/assets/fonts/archivo-var.woff2) format('woff2-variations');
}

/* ── 1 tokens ──────────────────────────────────────────────────── */
:root{
  --bg:#0A0D12;          /* vacuum black — also the colour the cell film is rendered onto */
  --bg-2:#0E1218;        /* raised band */
  --bg-3:#141921;        /* panels, table heads */
  --line:#1C222B;        /* hairlines */
  --line-2:#2A313C;      /* stronger rules */
  --t1:#EDF0F4;          /* headings, values            17.0:1 on --bg */
  --t2:#A9B2BE;          /* body copy                    9.1:1 */
  --t3:#848E9B;          /* labels, meta, older history  5.9:1 */
  --blue:#2558A7;        /* brand blue — fills only (white text on it 6.9:1) */
  --blue-2:#3567B8;
  --sky:#7FAAF0;         /* brand blue lifted for text on black   8.3:1 */
  --copper:#C98A63;      /* 6.8:1 */
  --li:#C9D1DB;
  --maxw:1280px;
  --gutter:clamp(16px,4.4vw,56px);
  --hdr:72px;
  --sans:Archivo,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --ease:cubic-bezier(.2,.7,.2,1);
}

/* ── 2 base ────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;background:var(--bg)}
body{
  margin:0;background:var(--bg);color:var(--t2);
  font-family:var(--sans);font-size:17px;line-height:1.62;
  font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img,video,svg{display:block;max-width:100%;height:auto}
h1,h2,h3{text-wrap:balance}
p,li,dd{text-wrap:pretty}
html{scrollbar-color:var(--line-2) var(--bg);scrollbar-width:thin}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--line-2);border:2px solid var(--bg);border-radius:6px}
.skip{position:absolute;left:12px;top:-80px;z-index:100;padding:12px 16px;background:var(--blue);color:#fff;font-weight:600;border-radius:999px}
.skip:focus{top:12px}
/* bigger tap area without changing how the pills look */
nav a::after,.lang a::after,.btn--sm::after{content:'';position:absolute;inset:-6px -2px;min-height:44px}
.lang a::after{inset:-8px -6px}
.notfound{font-size:clamp(4rem,12vw,7rem);font-weight:300;letter-spacing:-.05em;margin:0 0 12px}
.text-link{display:inline-flex;align-items:center;min-height:44px;color:var(--t1);font-weight:600;
  text-decoration:underline;text-decoration-color:var(--line-2);text-underline-offset:6px}
.text-link:hover{text-decoration-color:var(--sky)}
a{color:inherit;text-decoration:none}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}
figure{margin:0}
::selection{background:var(--blue);color:#fff}
:focus-visible{outline:2px solid var(--sky);outline-offset:3px;border-radius:2px}
.wrap{max-width:var(--maxw);margin:0 auto;padding-inline:var(--gutter)}
[id]{scroll-margin-top:calc(var(--hdr) + 12px)}
.dark{background:var(--bg);color:var(--t2)}       /* kept for templates; everything is dark now */
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ── 3 type ────────────────────────────────────────────────────── */
h1,h2,h3{margin:0;color:var(--t1);font-weight:600;letter-spacing:-.03em;line-height:1.04}
h1{font-size:clamp(2.5rem,5.6vw,5.2rem);font-weight:560;font-stretch:104%;letter-spacing:-.042em;line-height:.98}
h2{font-size:clamp(1.95rem,3.9vw,3.4rem);font-weight:560;font-stretch:104%;letter-spacing:-.036em;max-width:18ch}
h3{font-size:1.16rem;font-weight:620;letter-spacing:-.014em;line-height:1.25}
.lede{font-size:clamp(1.04rem,1.35vw,1.2rem);line-height:1.6;color:var(--t2);max-width:54ch}
.note{font-size:.9rem;color:var(--t3)}
/* section label: condensed caps, numbered like a drawing sheet */
.eyebrow{display:flex;align-items:center;gap:12px;margin:0 0 22px;
  font-size:.78rem;font-weight:600;font-stretch:78%;letter-spacing:.16em;text-transform:uppercase;color:var(--sky)}
.eyebrow b{font-weight:600;color:var(--t3)}
.eyebrow::after{content:"";flex:0 0 44px;height:1px;background:currentColor;opacity:.5}
.num{font-weight:300;font-stretch:100%;letter-spacing:-.045em;color:var(--t1);line-height:1}
.unit{font-weight:400;letter-spacing:0;color:var(--t3)}

/* ── 4 buttons ─────────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 24px;border-radius:999px;
  font-size:.96rem;font-weight:600;line-height:1;white-space:nowrap;cursor:pointer;
  background:var(--blue);color:#fff;border:1px solid var(--blue);
  transition:background .2s,border-color .2s,color .2s}
.btn:hover{background:var(--blue-2);border-color:var(--blue-2)}
.btn--ghost,.btn--ghost-ink{background:transparent;color:var(--t1);border-color:var(--line-2)}
.btn--ghost:hover,.btn--ghost-ink:hover{background:rgba(255,255,255,.06);border-color:#4A5462}
.btn--sm{position:relative;padding:10px 18px;font-size:.9rem}
.btn:active{transform:scale(.97)}
.btn .arr{transition:transform .2s var(--ease)}
@media (hover:hover) and (pointer:fine){ .btn:hover .arr{transform:translateX(3px)} }
.actions{display:flex;flex-wrap:wrap;gap:12px}

/* ── 5 header ──────────────────────────────────────────────────── */
header{position:fixed;inset:0 0 auto;z-index:60;
  transition:background .3s,border-color .3s,backdrop-filter .3s;border-bottom:1px solid transparent}
header.solid,header.open{background:rgba(10,13,18,.86);
  -webkit-backdrop-filter:blur(14px) saturate(140%);backdrop-filter:blur(14px) saturate(140%);
  border-bottom-color:var(--line)}
.bar{display:flex;align-items:center;gap:28px;height:var(--hdr)}
.bar>a:first-child{display:flex;align-items:center;min-height:44px;line-height:0;flex:none}
.bar img{height:22px;width:auto}
nav{margin-left:auto;display:flex;gap:4px}
nav a{position:relative;padding:8px 12px;border-radius:999px;font-size:.93rem;font-weight:500;color:#B5BEC9;transition:color .2s,background .2s}
nav a:hover{color:#fff}
nav a.is-current{color:#fff;background:rgba(255,255,255,.07)}
nav .nav-mail{display:none}
.lang{display:flex;gap:2px;align-items:center;font-size:.86rem;flex:none}
.lang a{position:relative;padding:5px 9px;border-radius:999px;color:#9AA4B1;font-weight:600;letter-spacing:.04em}
.lang a[aria-current]{color:#fff;background:rgba(255,255,255,.1)}
.lang a:hover{color:#fff}
.menu{display:none;flex:none;width:44px;height:44px;margin-right:-8px;padding:0;border:0;background:none;color:#fff;cursor:pointer}
.menu span,.menu span::before,.menu span::after{display:block;width:18px;height:1.5px;margin:auto;background:currentColor;
  position:relative;transition:transform .25s var(--ease),background .2s}
.menu span::before,.menu span::after{content:"";position:absolute;left:0}
.menu span::before{top:-6px}.menu span::after{top:6px}
header.open .menu span{background:transparent}
header.open .menu span::before{transform:translateY(6px) rotate(45deg)}
header.open .menu span::after{transform:translateY(-6px) rotate(-45deg)}

/* ── 6 hero + facts ────────────────────────────────────────────── */
.hero{position:relative;overflow:hidden;padding:calc(var(--hdr) + clamp(28px,6vw,72px)) 0 0;isolation:isolate}
/* a faint measurement grid, fading out toward the edges */
.hero::before{content:"";position:absolute;inset:0;z-index:-1;
  background-image:linear-gradient(to right,rgba(255,255,255,.045) 1px,transparent 1px),
                   linear-gradient(to bottom,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:64px 64px;background-position:center top;
  -webkit-mask-image:radial-gradient(70% 62% at 66% 42%,#000 20%,transparent 75%);
          mask-image:radial-gradient(70% 62% at 66% 42%,#000 20%,transparent 75%)}
.hero::after{content:"";position:absolute;z-index:-1;width:min(900px,90vw);aspect-ratio:1;right:-12%;top:-8%;
  background:radial-gradient(closest-side,rgba(53,103,184,.30),rgba(53,103,184,.08) 55%,transparent);filter:blur(10px)}
.hero__inner{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:clamp(24px,4vw,64px);align-items:center;
  min-height:min(calc(100svh - var(--hdr) - 190px),660px)}
.hero h1{margin-bottom:28px;max-width:13ch}
/* the English headline breaks after "deposited"; size it so that line fits the copy column */
html[lang="en"] .hero h1{max-width:none;font-size:clamp(2.1rem,4.9vw,4.6rem)}
.hero .lede{margin-bottom:36px;max-width:50ch}
.hero__art{position:relative;justify-self:center;width:min(100%,430px);padding-block:12px 28px}
.hero__art img{position:relative;width:100%;
  filter:drop-shadow(0 40px 50px rgba(0,0,0,.6)) drop-shadow(0 0 1px rgba(255,255,255,.12))}
.hero__art::before{content:"";position:absolute;inset:10% -12% 4%;border-radius:50%;
  background:radial-gradient(closest-side,rgba(170,192,226,.22),transparent);filter:blur(30px)}
.hero__art figcaption{position:absolute;right:-6px;bottom:0;display:flex;align-items:center;gap:10px;
  font-size:.74rem;font-weight:600;font-stretch:78%;letter-spacing:.16em;text-transform:uppercase;color:var(--t3)}
.hero__art figcaption::before{content:"";width:32px;height:1px;background:var(--line-2)}

.facts{position:relative;margin-top:clamp(36px,5vw,64px);border-top:1px solid var(--line)}
.facts dl{display:grid;grid-template-columns:repeat(4,1fr);margin:0}
.facts dl>div{padding:28px 26px 34px;border-left:1px solid var(--line);display:flex;flex-direction:column-reverse;justify-content:flex-end;gap:12px}
.facts dl>div:first-child{border-left:0;padding-left:0}
.facts dt{font-size:.88rem;color:var(--t3);line-height:1.4}
.facts dd{margin:0;display:flex;align-items:baseline;gap:.28em;white-space:nowrap}
.facts .num{font-size:clamp(2.1rem,3.6vw,3.3rem)}
.facts .unit{font-size:clamp(.95rem,1.3vw,1.15rem)}

/* ── 7 film band ───────────────────────────────────────────────── */
.film{position:relative;height:clamp(380px,46vw,660px);overflow:hidden;background:#000}
.film video,.film>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.film__shade{position:absolute;inset:0;
  background:linear-gradient(to bottom,var(--bg) 0,rgba(10,13,18,0) 22%,rgba(10,13,18,0) 48%,rgba(10,13,18,.82) 86%,var(--bg))}
.film__cap{position:absolute;inset:auto 0 0;left:50%;transform:translateX(-50%);width:100%;
  display:flex;align-items:flex-end;justify-content:space-between;gap:28px;padding-bottom:clamp(26px,4vw,50px)}
.film__line{margin:0;max-width:17ch;color:#fff;font-size:clamp(1.6rem,3.4vw,2.9rem);font-weight:560;font-stretch:104%;
  letter-spacing:-.036em;line-height:1.06;text-shadow:0 2px 24px rgba(0,0,0,.45)}
.chapters{display:flex;gap:18px;flex:none}
.chapters li{width:clamp(110px,11vw,150px);font-size:.8rem;font-weight:600;font-stretch:84%;letter-spacing:.06em;
  text-transform:uppercase;color:rgba(255,255,255,.6);transition:color .3s}
.chapters li.on{color:#fff}
.chapters i{display:block;height:2px;margin-top:10px;background:rgba(255,255,255,.22);position:relative;overflow:hidden}
.chapters i::after{content:"";position:absolute;inset:0;background:#fff;transform-origin:left;transform:scaleX(var(--p,0))}

/* ── shared section frame ──────────────────────────────────────── */
.sec{position:relative;padding-block:clamp(72px,9vw,132px)}
h2+.lede{margin-top:22px}
.sec+.sec{border-top:1px solid var(--line)}
.sec__head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(20px,4vw,64px);
  align-items:end;margin-bottom:clamp(44px,6vw,80px)}
.sec__head .lede{margin:0}
.sec__head .sec-link{margin-top:22px}
.sec__head h2{max-width:16ch}

/* ── 8 applications ────────────────────────────────────────────── */
.sec--apps{padding-top:clamp(40px,6vw,80px)}
.uses{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,80px)}
.uses h3{display:flex;align-items:baseline;justify-content:space-between;padding-bottom:16px;margin-bottom:4px;
  font-size:1.5rem;font-weight:560;letter-spacing:-.025em;border-bottom:1px solid var(--line-2)}
.uses h3 small{font-size:.74rem;font-weight:600;font-stretch:78%;letter-spacing:.16em;color:var(--t3)}
.uses li{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:20px;padding:18px 0;border-bottom:1px solid var(--line)}
.uses li b{font-weight:600;color:var(--t1)}
.uses li span{font-size:.95rem}

/* ── 9 cell (exploded view) ────────────────────────────────────── */
.split{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:clamp(32px,5vw,88px);align-items:center}
.explode{position:relative}
.explode__frame{position:relative;width:100%;max-width:620px;margin-inline:auto;aspect-ratio:1}
/* the film is rendered onto exactly --bg; a 4% feather on each edge hides any
   1-level colour shift from video compression, so the frame never shows as a box
   (the render keeps the cell 5.5% clear of every edge, so nothing is cut) */
.explode__frame video,.explode__frame img{position:absolute;inset:0;width:100%;height:100%;
  -webkit-mask-image:linear-gradient(to right,transparent,#000 4%,#000 96%,transparent),
                     linear-gradient(to bottom,transparent,#000 4%,#000 96%,transparent);
  -webkit-mask-composite:source-in;
          mask-image:linear-gradient(to right,transparent,#000 4%,#000 96%,transparent),
                     linear-gradient(to bottom,transparent,#000 4%,#000 96%,transparent);
          mask-composite:intersect}
/* without JS the open still and its numbers simply show; with JS the film runs first */
.js .explode__frame img{opacity:0;transition:opacity .4s}
.js .explode.still .explode__frame img{opacity:1}
.explode.still .explode__frame video{visibility:hidden}
.dot{position:absolute;z-index:2;display:grid;place-items:center;width:26px;height:26px;margin:-13px 0 0 -13px;
  border-radius:50%;background:var(--bg);border:1px solid var(--t1);color:var(--t1);
  font-size:.74rem;font-weight:700;line-height:1}
.dot::after{content:"";position:absolute;inset:-7px;border-radius:50%;border:1px solid rgba(237,240,244,.25)}
.js .dot{opacity:0;transform:scale(.6);transition:opacity .35s,transform .35s var(--ease)}
.js .explode.done .dot{opacity:1;transform:none}
.explode.done .dot:nth-of-type(2){transition-delay:.12s}
.explode.done .dot:nth-of-type(3){transition-delay:.24s}
.replay{display:none}
.js .replay{position:absolute;left:0;bottom:0;display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:999px;
  border:1px solid var(--line-2);background:transparent;color:var(--t2);font:inherit;font-size:.84rem;cursor:pointer;
  opacity:0;pointer-events:none;transition:opacity .3s,color .2s,border-color .2s}
.replay:hover{color:#fff;border-color:#4A5462}
.js .explode.done .replay{opacity:1;pointer-events:auto}
.js .explode.still .replay{display:none}
.legend{counter-reset:n;margin:30px 0 0;border-top:1px solid var(--line-2)}
.legend li{display:grid;grid-template-columns:26px 1fr auto;gap:16px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}
.legend li::before{counter-increment:n;content:counter(n);display:grid;place-items:center;width:26px;height:26px;border-radius:50%;
  border:1px solid var(--t1);color:var(--t1);font-size:.74rem;font-weight:700}
.legend b{font-weight:600;color:var(--t1)}
.legend span{font-size:.88rem;color:var(--t3);text-align:right}
.traits{display:grid;grid-template-columns:1fr 1fr;margin:36px 0 0;gap:0}
.traits div{padding:18px 18px 18px 0}
.traits div:nth-child(2n){padding-left:20px;border-left:1px solid var(--line)}
.traits div:nth-child(n+3){border-top:1px solid var(--line)}
.traits dt{font-weight:600;color:var(--t1);margin-bottom:4px}
.traits dd{margin:0;font-size:.93rem}

/* ── 10 anode thickness, deposition ────────────────────────────── */
.scale{--u:3.2px;display:grid;grid-template-columns:1fr 1fr;gap:clamp(18px,3vw,40px);align-items:end;
  padding:34px clamp(18px,3vw,36px) 28px;border:1px solid var(--line);border-radius:4px;background:var(--bg-2)}
.scale figure{display:flex;flex-direction:column;justify-content:flex-end;min-height:calc(var(--u) * 80 + 86px)}
.scale .layer{position:relative;height:calc(var(--u) * var(--um))}
.scale .layer--c{background:#2E3238 url(/assets/tex-graphite.webp) center/cover;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.18)}
.scale .layer--c::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(255,255,255,.08),rgba(0,0,0,.35))}
.scale .layer--li{background:linear-gradient(180deg,#F2F5F9 0%,#C3CBD5 55%,#9CA6B2 100%);
  box-shadow:inset 0 1px 0 #fff}
.scale .cu{height:14px;background:linear-gradient(180deg,#D99A72,#9D6744)}
/* dimension line on the left edge of each layer */
.scale .layer::after{content:attr(data-dim);position:absolute;left:0;bottom:calc(100% + 10px);
  font-size:clamp(1.5rem,2.6vw,2.2rem);font-weight:300;letter-spacing:-.04em;color:var(--t1);line-height:1;white-space:nowrap}
.scale figcaption{margin-top:14px;font-size:.92rem;font-weight:600;color:var(--t1)}
.scale__note{grid-column:1/-1;margin:4px 0 0;padding-top:16px;border-top:1px solid var(--line);font-size:.86rem;color:var(--t3)}
/* the lithium layer starts at graphite height and settles to its own: the 75% you save */
.js .scale .layer--li{height:calc(var(--u) * 80);transition:height 1.6s var(--ease) .25s}
.js .scale.is-in .layer--li{height:calc(var(--u) * var(--um))}
.readout{margin-top:28px}
.readout div{display:flex;justify-content:space-between;gap:18px;padding:14px 0;border-bottom:1px solid var(--line)}
.readout div:first-child{border-top:1px solid var(--line-2)}
.readout b{font-weight:600;color:var(--t1);white-space:nowrap}
.readout .hl b{color:var(--sky)}

.vs{width:100%;border-collapse:collapse;font-size:.97rem;margin-bottom:clamp(56px,7vw,96px)}
.vs th,.vs td{text-align:left;vertical-align:top;padding:16px 18px 16px 0;border-bottom:1px solid var(--line)}
.vs thead th{font-size:.78rem;font-weight:600;font-stretch:78%;letter-spacing:.16em;text-transform:uppercase;color:var(--t3);
  border-bottom:1px solid var(--line-2)}
.vs thead th:last-child{color:var(--sky)}
.vs tbody th{width:18%;font-weight:500;color:var(--t3)}
.vs td{width:41%}
.vs td:last-child{color:var(--t1);font-weight:600}

/* multi-material PVD: one wide loop, labels set as type under each stream */
.mats{margin-bottom:clamp(64px,8vw,112px)}
.mats__head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:8px 32px;margin-bottom:clamp(18px,2.4vw,28px)}
.mats__head h3{margin:0}
.mats__head p{margin:0;color:var(--t2);font-size:.97rem}
.mats__stage{position:relative;margin:0;aspect-ratio:2/1;overflow:hidden}
.mats__video{width:100%;height:100%;object-fit:cover;object-position:50% 50%;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 7%,#000 93%,transparent),linear-gradient(180deg,transparent,#000 9%,#000 88%,transparent);
  -webkit-mask-composite:source-in;
          mask-image:linear-gradient(90deg,transparent,#000 7%,#000 93%,transparent),linear-gradient(180deg,transparent,#000 9%,#000 88%,transparent);
          mask-composite:intersect}
.mats__list,.mats__roles{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;padding-inline:var(--mats-inset,7%)}
.mats__list{list-style:none;margin:0}
.mats__list li{padding-top:14px;text-align:center}
.mats__list b{display:block;font-size:clamp(1.3rem,2vw,1.7rem);font-weight:600;letter-spacing:-.01em;color:var(--t1)}
.mats__list b::after{content:"";display:block;width:22px;height:2px;margin:10px auto 0;background:var(--c);border-radius:1px}
.mats__roles{margin-top:14px}
.mats__roles p{margin:0;padding-top:12px;border-top:1px solid var(--line-2);text-align:center;font-size:.9rem;color:var(--t2)}
/* Ag and LiF share one line: both belong to the anode-free family */
.mats__roles .mats__group{grid-column:span 2;border-top-color:var(--t3)}
@media (max-width:640px){
  .mats__list,.mats__roles{gap:6px}
  .mats__list li{padding-top:10px}
  .mats__list b{font-size:1.1rem}
  .mats__list b::after{width:16px;margin-top:7px}
  .mats__roles p{font-size:.76rem;line-height:1.4;padding-top:9px}
}

.foils{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,56px)}
.foil img{width:100%;aspect-ratio:4/3;object-fit:contain;padding:clamp(18px,3vw,40px);
  background:radial-gradient(closest-side,#1A2029,var(--bg-2));border:1px solid var(--line);border-radius:4px}
.foil figcaption{padding-top:20px}
.foil h3{margin-bottom:8px}
.foil p{margin:0;font-size:.97rem;max-width:46ch}

.sei{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(28px,5vw,80px);align-items:center;
  margin-top:clamp(64px,8vw,112px)}
.sei h3{font-size:clamp(1.4rem,2.2vw,1.9rem);font-weight:560;letter-spacing:-.03em;margin-bottom:16px}
.sei .lede{font-size:1.02rem}
.sei__pair{display:grid;grid-template-columns:1fr 1fr;gap:clamp(14px,2vw,24px)}
.sei__pair figure{border:1px solid var(--line);border-radius:4px;background:var(--bg-2);padding:16px 16px 14px}
.sei__pair figure.ok{border-color:#2B4570}
.sei__pair svg{width:100%;height:auto}
.sei__pair figcaption{margin-top:12px;font-size:.86rem;line-height:1.45;color:var(--t3)}
.sei__pair figcaption b{display:block;color:var(--t1);font-weight:600;margin-bottom:2px}
.sei__pair .ok figcaption b{color:var(--sky)}
.svg-lbl{font-family:var(--sans);font-size:11px;font-weight:600;letter-spacing:.02em}
.equip{display:flex;gap:16px;align-items:flex-start;margin-top:30px;padding-top:22px;border-top:1px solid var(--line)}
.equip svg{flex:none;width:34px;height:34px;color:var(--sky)}
.equip p{margin:0;font-size:.95rem}
.equip b{color:var(--t1);font-weight:600}

/* ── 11 products ───────────────────────────────────────────────── */
.prod-head{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(24px,4vw,64px);align-items:center;
  margin-bottom:clamp(36px,5vw,64px)}
.prod-head h2{margin-bottom:0}
/* the still is rendered onto exactly --bg; a soft edge hides the frame */
.prod-visual img{width:100%;max-width:520px;margin-inline:auto;
  -webkit-mask-image:linear-gradient(to right,transparent,#000 4%,#000 96%,transparent),linear-gradient(to bottom,transparent,#000 4%,#000 96%,transparent);
  -webkit-mask-composite:source-in;
  mask-image:linear-gradient(to right,transparent,#000 4%,#000 96%,transparent),linear-gradient(to bottom,transparent,#000 4%,#000 96%,transparent);
  mask-composite:intersect}
.cells{display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,3vw,32px)}
.cell{border:1px solid var(--line);border-radius:4px;background:var(--bg-2);padding:clamp(22px,3vw,36px)}
.cell__top{display:grid;grid-template-columns:auto 1fr;gap:clamp(18px,3vw,36px);align-items:end;
  padding-bottom:24px;border-bottom:1px solid var(--line-2)}
/* both outlines are drawn at 1.4 px per mm and shown at their intrinsic size,
   never stretched to a common height — that is what keeps them to the same scale */
.cell__draw{min-height:221px;display:flex;align-items:flex-end}
.cell__draw svg{width:auto;height:auto;flex:none;overflow:visible}
.cell h3{font-size:clamp(1.8rem,2.8vw,2.4rem);font-weight:560;font-stretch:104%;letter-spacing:-.04em}
.cell h3+p{margin:6px 0 18px;font-size:.88rem;font-weight:600;font-stretch:84%;letter-spacing:.08em;text-transform:uppercase;color:var(--t3)}
.cell__big{display:flex;gap:28px}
.cell__big div{display:flex;flex-direction:column}
.cell__big .num{font-size:clamp(1.8rem,2.6vw,2.6rem);white-space:nowrap}
.cell__big small{font-size:.82rem;color:var(--t3);margin-top:4px}
.spec{width:100%;border-collapse:collapse;font-size:.96rem;margin-top:8px}
.spec th{text-align:left;font-weight:400;color:var(--t3);padding:12px 0;border-bottom:1px solid var(--line);width:56%}
.spec td{text-align:right;font-weight:600;color:var(--t1);padding:12px 0;border-bottom:1px solid var(--line)}
.spec tr:last-child th,.spec tr:last-child td{border-bottom:0}
.cells-foot{display:flex;flex-wrap:wrap;gap:18px;justify-content:space-between;align-items:center;margin-top:28px}
.cells-foot .note{margin:0;max-width:62ch}

/* ── 12 company / history ──────────────────────────────────────── */
.company{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(32px,6vw,96px);align-items:start}
.company h2{margin-bottom:28px}
.about{margin:0;border-top:1px solid var(--line-2)}
.about div{display:flex;justify-content:space-between;gap:16px;padding:13px 0;border-bottom:1px solid var(--line);font-size:.95rem}
.about dt{color:var(--t3)}
.about dd{margin:0;color:var(--t1);text-align:right}
/* newest first; each older entry steps down in tone (all still ≥ 5.9:1) */
.timeline{position:relative;border-left:1px solid var(--line-2);margin-left:6px}
.timeline li{position:relative;display:grid;grid-template-columns:96px 1fr;gap:20px;padding:0 0 30px 32px;color:var(--t3)}
.timeline li:last-child{padding-bottom:0}
.timeline li::before{content:"";position:absolute;left:-4px;top:.55em;width:7px;height:7px;border-radius:50%;
  background:var(--bg);border:1px solid var(--line-2)}
.timeline time{font-weight:600;letter-spacing:.01em}
.timeline li:nth-child(2){color:#C4CBD4}
.timeline li:nth-child(3){color:var(--t2)}
.timeline li:nth-child(4){color:#98A2AF}
.timeline li:nth-child(5){color:#8D97A4}
.timeline li:nth-child(2) time,.timeline li:nth-child(3) time{color:var(--t1)}
.timeline li.latest{padding-bottom:40px;color:var(--t1)}
.timeline li.latest::before{left:-7px;width:13px;height:13px;background:var(--sky);border:0;box-shadow:0 0 0 5px rgba(127,170,240,.18)}
.timeline li.latest time{color:var(--sky)}
.timeline .ev{margin:0}
.timeline li.latest .ev{font-size:clamp(1.2rem,1.9vw,1.55rem);font-weight:560;letter-spacing:-.02em;line-height:1.3}
.timeline .tag{display:inline-block;margin:0 0 10px;padding:3px 9px;border-radius:999px;
  font-size:.7rem;font-weight:700;font-stretch:84%;letter-spacing:.12em;text-transform:uppercase;
  color:var(--bg);background:var(--sky)}

/* ── 13 insights strip + contact ───────────────────────────────── */
.latest-issues{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(16px,2vw,24px)}
.latest-issues a,.latest-issues__row{display:flex;flex-direction:column;height:100%;padding:24px 24px 26px;border:1px solid var(--line);border-radius:4px;
  background:var(--bg-2);transition:border-color .2s,background .2s}
.latest-issues a:hover{border-color:#3A4B66;background:#111722}
.latest-issues time{font-size:.8rem;font-weight:600;color:var(--sky);margin-bottom:14px}
.latest-issues h3{font-size:1.12rem;margin-bottom:10px}
.latest-issues p{margin:0;font-size:.92rem;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.sec-link{display:inline-flex;align-items:center;gap:8px;min-height:44px;color:var(--t1);font-weight:600;font-size:.95rem;
  border-bottom:1px solid var(--line-2);padding-bottom:4px}
.sec-link:hover{border-bottom-color:var(--sky)}

.contact{position:relative;overflow:hidden;isolation:isolate}
.contact::before{content:"";position:absolute;z-index:-1;width:min(1100px,120vw);aspect-ratio:2;left:50%;bottom:-40%;transform:translateX(-50%);
  background:radial-gradient(closest-side,rgba(53,103,184,.26),transparent)}
.contact__grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,.7fr);gap:clamp(32px,6vw,96px);align-items:end}
.contact h2{max-width:14ch;margin-bottom:30px}
.mail{display:inline-block;min-height:44px;font-size:clamp(1.5rem,4vw,3.2rem);font-weight:400;letter-spacing:-.04em;color:#fff;line-height:1.1;
  border-bottom:1px solid var(--line-2);padding-bottom:8px;margin-bottom:22px;word-break:break-word;transition:border-color .2s}
.mail:hover{border-bottom-color:var(--sky)}
address{font-style:normal;line-height:1.8;color:var(--t2)}
.contact h3{margin-bottom:12px}

/* ── 14 footer, root chooser ───────────────────────────────────── */
footer{border-top:1px solid var(--line);padding:40px 0 52px;font-size:.88rem;color:var(--t3);background:var(--bg)}
.foot{display:flex;flex-wrap:wrap;gap:26px 40px;justify-content:space-between;align-items:flex-start}
.foot img{height:24px;width:auto;margin-bottom:12px}
.foot a{display:inline-flex;align-items:center;min-height:44px;color:var(--t2)}
.foot a:hover{color:#fff}

.choose{min-height:100svh;display:grid;place-items:center;text-align:center;padding:40px 24px}
.choose img{height:38px;width:auto;margin:0 auto 26px}
.choose p{color:var(--t2);max-width:46ch;margin:0 auto 34px}
.choose .actions{justify-content:center}

/* ── 15 insight pages (templates/insight.html, insights-index.html) ─ */
header.light-bar{position:sticky;top:0;background:rgba(10,13,18,.9);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
header.light-bar nav a[aria-current]{color:#fff;background:rgba(255,255,255,.07)}
.page-head{padding-block:clamp(56px,8vw,104px) clamp(34px,4vw,52px)}
.page-head h1{font-size:clamp(2.1rem,4.4vw,3.6rem);max-width:20ch;margin-bottom:20px}
.page-head .lede{max-width:58ch}
.issues{border-top:1px solid var(--line-2)}
.issues li{border-bottom:1px solid var(--line)}
.issues a{display:grid;grid-template-columns:170px 1fr;gap:clamp(18px,3vw,40px);
  padding:clamp(24px,3vw,36px) 0;align-items:baseline;transition:background .2s}
.issues a:hover h2{color:var(--sky)}
.issues time{font-weight:600;color:var(--sky);font-size:.95rem}
.issues h2{font-size:clamp(1.2rem,2vw,1.6rem);font-weight:560;max-width:32ch;margin-bottom:8px;transition:color .2s}
.issues p{margin:0;color:var(--t2);font-size:.97rem;max-width:66ch}

.issue{max-width:740px;margin:0 auto}
.issue h1{font-size:clamp(2rem,4vw,3.1rem);line-height:1.08;max-width:22ch}
.issue-meta{display:flex;flex-wrap:wrap;gap:12px;align-items:center;
  padding-bottom:22px;border-bottom:1px solid var(--line-2);margin-bottom:clamp(30px,4vw,48px)}
.issue-meta time{font-weight:600;color:var(--sky)}
.issue-meta .tag{font-size:.8rem;color:var(--t2);border:1px solid var(--line-2);border-radius:999px;padding:3px 11px}
.prose{font-size:1.05rem;line-height:1.75;color:#C4CBD4}
.prose h2{font-size:clamp(1.35rem,2.3vw,1.8rem);max-width:30ch;margin:clamp(42px,5vw,60px) 0 16px}
.prose h3{font-size:1.12rem;margin:32px 0 10px}
.prose p{margin:0 0 1.2em}
.prose strong{color:var(--t1)}
.prose ul,.prose ol{margin:0 0 1.3em;padding-left:1.3em}
.prose ul{list-style:disc}.prose ol{list-style:decimal}
.prose li{margin-bottom:.5em}
.prose li::marker{color:var(--t3)}
.prose a{color:var(--sky);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{text-decoration-thickness:2px}
.prose blockquote{margin:1.6em 0;padding:4px 0 4px 22px;border-left:2px solid var(--copper);color:var(--t2)}
.prose blockquote p:last-child{margin:0}
.prose code{background:var(--bg-3);padding:2px 6px;border-radius:3px;font-size:.9em}
.prose hr{border:0;border-top:1px solid var(--line-2);margin:clamp(36px,5vw,54px) 0}
.prose table{display:block;overflow-x:auto;width:100%;border-collapse:collapse;margin:1.6em 0;font-size:.94rem}
.prose th,.prose td{text-align:left;padding:11px 14px 11px 0;border-bottom:1px solid var(--line);vertical-align:top}
.prose th{font-weight:600;color:var(--t1);border-bottom:1px solid var(--line-2);white-space:nowrap}
.prose img{margin:1.8em 0;width:100%;border-radius:4px}
.prose figcaption{font-size:.88rem;color:var(--t3);margin-top:-1.1em;margin-bottom:1.8em}
.redacted{background:var(--bg-3);color:var(--t2);padding:1px 7px;border-radius:3px;font-size:.95em;white-space:nowrap}
.issue-foot{max-width:740px;margin:clamp(52px,6vw,80px) auto 0;padding-top:28px;border-top:1px solid var(--line-2);
  display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center}
.issue-foot .note{margin:0}

/* ── responsive ────────────────────────────────────────────────── */
@media (max-width:1100px){
  .chapters li{width:auto}
  .film__cap{flex-direction:column;align-items:flex-start}
}
@media (max-width:1180px){
  .cell__top{grid-template-columns:1fr;align-items:start}
}
@media (max-width:980px){
  :root{--hdr:64px}
  .menu{display:block}
  nav{position:absolute;top:100%;left:0;right:0;display:none;flex-direction:column;gap:0;margin:0;
    padding:8px var(--gutter) 20px;background:rgba(10,13,18,.97);border-bottom:1px solid var(--line)}
  header.open nav{display:flex}
  nav a{padding:14px 0;border-radius:0;border-bottom:1px solid var(--line);font-size:1rem}
  nav a.is-current{background:none}
  .lang{margin-left:auto}
  .hero__inner,.split,.sec__head,.prod-head,.uses,.foils,.sei,.cells,.company,.contact__grid{grid-template-columns:minmax(0,1fr)}
  .hero__inner{min-height:0}
  .hero__art{order:-1;width:min(56%,260px)}
  .hero__art figcaption{display:none}
  .hero h1{max-width:16ch}
  .facts dl{grid-template-columns:1fr 1fr}
  .facts dl>div{padding:22px 18px 24px}
  .facts dl>div:nth-child(2n+1){border-left:0;padding-left:0}
  .facts dl>div:nth-child(n+3){border-top:1px solid var(--line)}
  .sec__head{align-items:start}
  .latest-issues{grid-template-columns:1fr}
  .vs tbody th{width:22%}
}
@media (max-width:640px){
  body{font-size:16px}
  .bar{gap:12px}
  .bar img{height:19px}
  .bar>.btn{display:none}
  nav .nav-mail{display:block;color:var(--sky)}
  .film{height:auto;aspect-ratio:auto;display:flex;flex-direction:column}
  .film video,.film>img{position:relative;height:auto;aspect-ratio:1440/690}
  .film__shade{background:linear-gradient(to bottom,var(--bg) 0,rgba(10,13,18,0) 18%,rgba(10,13,18,0) 70%,var(--bg) 100%);bottom:auto;aspect-ratio:1440/690}
  .film__cap{position:relative;left:auto;transform:none;padding-top:18px}
  .chapters{width:100%;gap:10px}
  .chapters li{flex:1;font-size:.7rem;letter-spacing:.03em}
  .uses li{grid-template-columns:1fr;gap:2px}
  .scale{--u:2px;padding:26px 16px 20px}
  .traits{grid-template-columns:1fr}
  .traits div,.traits div:nth-child(2n){padding:14px 0;border-left:0}
  .traits div:nth-child(n+2){border-top:1px solid var(--line)}
  .vs thead{display:none}
  .vs,.vs tbody,.vs tr,.vs th,.vs td{display:block;width:auto}
  .vs tr{padding:14px 0;border-bottom:1px solid var(--line)}
  .vs th,.vs td{padding:2px 0;border:0}
  .vs tbody th{width:auto;font-size:.8rem;font-weight:600;font-stretch:84%;letter-spacing:.1em;text-transform:uppercase;margin-bottom:4px}
  .vs td::before{content:attr(data-h);display:inline-block;min-width:5.5em;margin-right:8px;color:var(--t3);font-weight:400;font-size:.86rem}
  .sei__pair{grid-template-columns:1fr}
  .cell__top{grid-template-columns:1fr}
  .timeline li{grid-template-columns:1fr;gap:2px;padding-left:24px}
  .issues a{grid-template-columns:1fr;gap:6px;padding:22px 0}
  .legend span{display:none}
}

/* ── 16 Korean — Pretendard (self-hosted) for Hangul and body text ─ */
html[lang="ko"]{--sans:"Pretendard Variable",Pretendard,Archivo,-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Malgun Gothic","Noto Sans KR",sans-serif}
html[lang="ko"] body{line-height:1.72;word-break:keep-all;overflow-wrap:break-word}
html[lang="ko"] h1,html[lang="ko"] h2,html[lang="ko"] h3,html[lang="ko"] .film__line{font-stretch:100%;letter-spacing:-.03em;line-height:1.22}
html[lang="ko"] h1{font-weight:640;line-height:1.16;font-size:clamp(2.3rem,4.8vw,4.5rem)}
html[lang="ko"] h2{font-weight:640;max-width:13em}
html[lang="ko"] .hero h1{max-width:15em}
html[lang="ko"] .sec__head h2{max-width:12em}
html[lang="ko"] .lede{line-height:1.78}
html[lang="ko"] .prose{line-height:1.85}
/* figures, units, labels keep Archivo so numbers look the same in both languages */
html[lang="ko"] .num,html[lang="ko"] .unit,html[lang="ko"] .eyebrow,html[lang="ko"] .spec,html[lang="ko"] .cell h3,
html[lang="ko"] .mail,html[lang="ko"] .timeline time,html[lang="ko"] .scale .layer::after,html[lang="ko"] .lang,
html[lang="ko"] nav,html[lang="ko"] .hero__art figcaption{font-family:Archivo,var(--sans)}

/* ── 17 motion ─────────────────────────────────────────────────── */
/* hero entrance — content stays visible without JS (.js is set in <head>) */
.js .rise{opacity:0;transform:translateY(18px)}
.js .in .rise{opacity:1;transform:none;transition:opacity .8s var(--ease),transform .8s var(--ease)}
.js .in .rise:nth-child(2){transition-delay:.08s}
.js .in .rise:nth-child(3){transition-delay:.16s}
.js .in .rise:nth-child(4){transition-delay:.24s}
.js .in .hero__art.rise{transition-delay:.1s;transition-duration:1.2s}
/* section reveal — one soft rise, once */
.js .reveal{opacity:0;transform:translateY(24px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.js .reveal.is-in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .rise,.js .reveal{opacity:1;transform:none}
  .js .scale .layer--li{height:calc(var(--u) * var(--um))}
  .chapters i{display:none}
  .btn:active{transform:none}
  .btn .arr{transition:none}
}

/* ── sub pages ─────────────────────────────────────────────── */
.page-head .eyebrow{margin-bottom:18px}
.page-head .eyebrow a{color:inherit}
.page-body{padding-bottom:clamp(72px,10vw,120px)}
.page-head + .sec{padding-top:clamp(24px,3vw,40px)}
/* list rows that have no page of their own (short news) */
.issues__row{display:grid;grid-template-columns:170px 1fr;gap:clamp(18px,3vw,40px);padding:28px 0}
.issues__row h2{font-size:clamp(1.2rem,2vw,1.6rem);font-weight:560;max-width:32ch;margin-bottom:8px}
.issue-source{margin-top:36px;padding-top:18px;border-top:1px solid var(--line);font-size:.92rem;color:var(--t3)}
.issue-source p{margin:0 0 8px;font-weight:600}
.issue-source ul{margin:0;padding:0;list-style:none}
.issue-source li{margin:4px 0}
.issue-source a{color:var(--sky);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose figure{margin:0 0 2em}
.prose figure img{width:100%;height:auto;border-radius:4px}
.prose figcaption{margin-top:10px;font-size:.88rem;color:var(--t3)}
/* anode material cards (products) */
.mat-cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(14px,2vw,24px);margin-top:clamp(40px,5vw,64px)}
.mat-card{padding-top:20px;border-top:2px solid var(--c)}
.mat-card .mat-card__sym{margin:0 0 14px;font-size:clamp(2rem,3vw,2.6rem);font-weight:560;letter-spacing:-.03em;line-height:1;color:var(--t1)}
.mat-card h3{margin-bottom:12px;font-size:1.05rem}
.mat-card h3 small{display:block;margin-top:4px;font-size:.88rem;font-weight:500;color:var(--t2);letter-spacing:0}
.mat-card p{margin:0;font-size:.92rem;color:var(--t2)}
.mat-card .mat-card__status{margin-top:14px;font-size:.84rem;color:var(--t3)}
@media (max-width:980px){ .mat-cards{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:36px} }
@media (max-width:640px){
  .issues__row{grid-template-columns:1fr;gap:6px}
}