:root{
  --k-ink:#0B1F1A;
  --k-ink-2:#122E26;
  --k-ink-3:#0E2721;
  --k-mint:#3BF0B0;
  --k-mint-dark:#1E7A5B;
  --k-amber:#FFA23A;
  --k-paper:#F2EAD8;
  --k-black:#171310;
  --k-muted:#8FA79C;
  --k-blue:#7FD3E8;
  --k-alert:#D9552F;
  --k-rail:72px;
  --k-gap:24px;
  --k-pad:clamp(18px,4vw,40px);
  --k-max:1240px;
  --k-shadow-1:0 3px 0 0 var(--k-black);
  --k-shadow-2:0 6px 0 0 var(--k-black);
  --k-shadow-3:0 10px 0 0 var(--k-black);
  --k-line:2px solid var(--k-black);
  --k-line-thin:1px solid rgba(23,19,16,.35);
  --k-radius:0;
  --k-ease:cubic-bezier(.22,.61,.36,1);
  --k-fs-14:14px;--k-fs-16:16px;--k-fs-20:20px;--k-fs-25:25px;
  --k-fs-31:31px;--k-fs-39:39px;--k-fs-49:49px;--k-fs-61:61px;--k-fs-76:76px;
  --k-font-display:"Oswald","Archivo Narrow","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --k-font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --k-font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--k-ink);
  color:var(--k-paper);
  font-family:var(--k-font-body);
  font-size:var(--k-fs-16);
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--k-font-display);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.1;
  margin:0 0 .5em;
  text-wrap:balance;
}
h1{font-size:clamp(var(--k-fs-49),7vw,var(--k-fs-76))}
h2{font-size:clamp(var(--k-fs-31),4.4vw,var(--k-fs-49))}
h3{font-size:clamp(var(--k-fs-25),3vw,var(--k-fs-31))}
h4{font-size:var(--k-fs-20)}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
a{color:var(--k-mint);text-decoration:none;text-underline-offset:.22em}
a:hover{text-decoration:underline}
ul,ol{margin:0 0 1em;padding-left:1.25em}
li{margin:.15em 0}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit}
strong,b{font-weight:700;color:#fff}
code,kbd,samp,pre{font-family:var(--k-font-mono)}
hr{border:0;border-top:var(--k-line);margin:2em 0}
::selection{background:var(--k-mint);color:var(--k-black)}
:focus-visible{
  outline:2px solid var(--k-mint);
  outline-offset:2px;
  border-radius:0;
}
.k-paper :focus-visible,.k-panel--paper :focus-visible{outline-color:var(--k-black);outline-offset:3px}

/* ---------- skip link ---------- */
.k-skip{
  position:fixed;
  top:0;left:0;
  z-index:200;
  transform:translateY(-120%);
  background:var(--k-mint);
  color:var(--k-black);
  font-weight:700;
  padding:12px 20px;
  border:var(--k-line);
  transition:transform 160ms var(--k-ease);
}
.k-skip:focus{transform:translateY(0);text-decoration:none}

/* ---------- scroll progress ---------- */
.k-scroll-progress{
  position:fixed;
  top:0;left:0;
  height:4px;
  width:100%;
  transform:scaleX(var(--k-progress,0));
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--k-mint),var(--k-blue) 60%,var(--k-amber));
  z-index:150;
  transition:transform 120ms linear;
  pointer-events:none;
}

/* ---------- frame ---------- */
.k-frame{
  display:grid;
  grid-template-columns:var(--k-rail) minmax(0,1fr);
  grid-template-rows:auto 1fr auto;
  grid-template-areas:
    "rail topbar"
    "rail body"
    "rail foot";
  min-height:100vh;
  max-width:1600px;
  margin:0 auto;
  background:var(--k-ink);
  position:relative;
}
.k-frame__body{grid-area:body;min-width:0;padding:0 var(--k-pad) 0 0}

/* ---------- left rail ---------- */
.k-rail{
  grid-area:rail;
  position:sticky;
  top:0;
  align-self:start;
  height:100vh;
  width:var(--k-rail);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:28px;
  padding:20px 8px 20px;
  background:var(--k-ink-2);
  border-right:2px solid var(--k-black);
  box-shadow:var(--k-shadow-1);
  z-index:60;
}
.k-brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--k-paper);
  text-decoration:none;
  font-family:var(--k-font-display);
  font-weight:800;
  letter-spacing:-.02em;
}
.k-brand:hover{text-decoration:none;color:var(--k-mint)}
.k-brand__mark{
  display:grid;
  place-items:center;
  width:38px;height:38px;
  flex:0 0 auto;
  background:var(--k-mint);
  color:var(--k-black);
  font-family:var(--k-font-display);
  font-size:22px;
  font-weight:900;
  line-height:1;
  border:2px solid var(--k-black);
  box-shadow:var(--k-shadow-1);
  transform:skewY(-4deg);
}
.k-brand__text{
  writing-mode:vertical-rl;
  text-orientation:upright;
  font-size:15px;
  letter-spacing:.16em;
  line-height:1.15;
}
.k-nav{width:100%;flex:1 1 auto;min-height:0;overflow:auto;scrollbar-width:none}
.k-nav::-webkit-scrollbar{display:none}
.k-nav__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.k-nav__item{margin:0}
.k-nav__link{
  position:relative;
  display:block;
  padding:10px 6px;
  color:var(--k-paper);
  font-size:13px;
  line-height:1.35;
  text-align:center;
  letter-spacing:.04em;
  border:1px solid transparent;
  transition:background 160ms var(--k-ease),color 160ms var(--k-ease),transform 160ms var(--k-ease);
}
.k-rail .k-nav__link{writing-mode:vertical-rl;text-orientation:upright;margin-inline:auto;min-height:66px}
.k-nav__link:hover{
  background:var(--k-ink-3);
  color:var(--k-mint);
  text-decoration:none;
  transform:translateY(-2px);
}
.k-nav__link[aria-current="page"]{
  color:var(--k-black);
  background:var(--k-mint);
  font-weight:700;
  border-color:var(--k-black);
  box-shadow:var(--k-shadow-1);
}
.k-nav__link[aria-current="page"]::before{
  content:"";
  position:absolute;
  top:0;bottom:0;left:-1px;
  width:4px;
  background:var(--k-amber);
}
.k-rail__note{
  margin:0;
  font-size:11px;
  line-height:1.5;
  color:var(--k-muted);
  writing-mode:vertical-rl;
  text-orientation:upright;
  letter-spacing:.06em;
  max-height:150px;
  overflow:hidden;
}

/* ---------- topbar ---------- */
.k-topbar{
  grid-area:topbar;
  display:flex;
  align-items:center;
  gap:20px;
  flex-wrap:wrap;
  padding:14px var(--k-pad) 14px 20px;
  background:var(--k-ink-2);
  border-bottom:2px solid var(--k-black);
  box-shadow:var(--k-shadow-1);
  position:sticky;
  top:0;
  z-index:55;
}
.k-topbar__brand{display:flex;flex-direction:column;margin:0;line-height:1.3}
.k-topbar__line{
  font-family:var(--k-font-display);
  font-weight:800;
  font-size:15px;
  letter-spacing:-.01em;
  color:var(--k-paper);
}
.k-topbar__tag{
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--k-muted);
}
.k-topbar__utility{flex:1 1 180px;min-width:0}
.k-topbar__cta{flex:0 0 auto}

/* ---------- utility ---------- */
.k-utility{
  margin:0;
  font-size:13px;
  line-height:1.6;
  color:var(--k-muted);
  letter-spacing:.01em;
}

/* ---------- buttons ---------- */
.k-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  font-family:var(--k-font-display);
  font-weight:700;
  font-size:15px;
  line-height:1.2;
  letter-spacing:.01em;
  border:2px solid var(--k-black);
  border-radius:0;
  cursor:pointer;
  text-decoration:none;
  transition:transform 160ms var(--k-ease),box-shadow 160ms var(--k-ease),background 160ms var(--k-ease),color 160ms var(--k-ease);
}
.k-btn:hover{text-decoration:none;transform:translateY(-2px)}
.k-btn--solid{background:var(--k-mint);color:var(--k-black);box-shadow:var(--k-shadow-1)}
.k-btn--solid:hover{background:var(--k-amber);box-shadow:var(--k-shadow-2)}
.k-btn--ghost{background:transparent;color:var(--k-mint);border-color:var(--k-mint);box-shadow:0 3px 0 0 rgba(59,240,176,.35)}
.k-btn--ghost:hover{background:var(--k-mint);color:var(--k-black);box-shadow:var(--k-shadow-1)}

/* ---------- mobile nav toggle ---------- */
.k-nav-toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:44px;height:44px;
  padding:0 10px;
  background:var(--k-ink);
  border:2px solid var(--k-mint);
  cursor:pointer;
}
.k-nav-toggle__bar{
  display:block;
  height:2px;
  width:100%;
  background:var(--k-mint);
  transition:transform 180ms var(--k-ease),opacity 180ms var(--k-ease);
}
.k-nav-toggle[aria-expanded="true"]{background:var(--k-mint)}
.k-nav-toggle[aria-expanded="true"] .k-nav-toggle__bar{background:var(--k-black)}
.k-nav-toggle[aria-expanded="true"] .k-nav-toggle__bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.k-nav-toggle[aria-expanded="true"] .k-nav-toggle__bar:nth-child(2){opacity:0}
.k-nav-toggle[aria-expanded="true"] .k-nav-toggle__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- mobile nav panel ---------- */
.k-nav-panel{
  position:fixed;
  inset:0 0 0 auto;
  width:min(320px,86vw);
  background:var(--k-ink-2);
  border-left:2px solid var(--k-black);
  box-shadow:-6px 0 0 0 rgba(23,19,16,.9);
  padding:88px 20px 28px;
  z-index:120;
  overflow:auto;
}
.k-nav-panel[hidden]{display:none}
.k-nav__list--stacked{flex-direction:column;gap:2px}
.k-nav__list--stacked .k-nav__link{
  writing-mode:horizontal-tb;
  text-align:left;
  font-size:16px;
  padding:14px 12px;
  border-bottom:1px solid rgba(143,167,156,.22);
}
.k-nav__list--stacked .k-nav__link[aria-current="page"]{box-shadow:none}
.k-nav__list--stacked .k-nav__link[aria-current="page"]::before{left:0;width:5px}

/* ---------- main / sections ---------- */
.k-main{display:block;min-width:0}
.k-main:focus{outline:none}
.k-section{
  position:relative;
  padding:clamp(32px,5vw,64px) 0 clamp(32px,5vw,64px) var(--k-pad);
  border-bottom:2px solid var(--k-black);
}
.k-section--ink{background:var(--k-ink)}
.k-section--deep{background:var(--k-ink-2)}
.k-section--tilt{
  clip-path:polygon(0 0,100% 2.2%,100% 100%,0 97.8%);
  margin-block:6px;
}
.k-section--paper{background:var(--k-paper);color:var(--k-black)}
.k-section--paper a{color:var(--k-mint-dark)}
.k-section--paper a:hover{color:var(--k-black)}
.k-section__inner{max-width:var(--k-max);margin:0 auto}
.k-eyebrow{
  margin:0 0 14px;
  font-family:var(--k-font-mono);
  font-size:13px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--k-mint);
}
.k-section--paper .k-eyebrow{color:var(--k-mint-dark)}
.k-lede{font-size:var(--k-fs-20);line-height:1.65;max-width:38em;color:#DDEAE4}
.k-section--paper .k-lede{color:#3A322B}

/* ---------- breadcrumb ---------- */
.k-breadcrumb{padding:18px 0 0 var(--k-pad);max-width:var(--k-max);margin:0 auto}
.k-breadcrumb__list{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0;
  padding:0;
  font-family:var(--k-font-mono);
  font-size:13px;
  color:var(--k-muted);
}
.k-breadcrumb__list li{margin:0;display:flex;align-items:center;gap:8px}
.k-breadcrumb__list li+li::before{content:"/";color:var(--k-muted);opacity:.6}
.k-breadcrumb__link{color:var(--k-muted)}
.k-breadcrumb__link:hover{color:var(--k-mint)}
.k-breadcrumb__current{color:var(--k-paper)}

/* ---------- panels ---------- */
.k-panel{
  position:relative;
  background:var(--k-ink-2);
  border:2px solid var(--k-black);
  box-shadow:var(--k-shadow-2);
  padding:clamp(18px,3vw,28px);
  transition:transform 160ms var(--k-ease),box-shadow 160ms var(--k-ease),background 160ms var(--k-ease);
}
.k-panel:hover,.k-panel:focus-within{
  transform:translateY(-2px);
  box-shadow:var(--k-shadow-3);
}
.k-panel__tag{
  position:absolute;
  top:0;left:0;
  transform:translateY(-100%);
  padding:4px 12px;
  background:var(--k-mint);
  color:var(--k-black);
  font-family:var(--k-font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  border:2px solid var(--k-black);
  border-bottom:0;
}
.k-panel__no{
  position:absolute;
  top:10px;right:12px;
  font-family:var(--k-font-mono);
  font-size:12px;
  color:var(--k-muted);
  letter-spacing:.08em;
}
.k-panel--paper{background:var(--k-paper);color:var(--k-black);border-color:var(--k-black)}
.k-panel--paper .k-panel__no{color:#6C6154}
.k-panel--paper .k-panel__tag{background:var(--k-black);color:var(--k-mint)}
.k-panel--live{border-color:var(--k-mint)}
.k-panel--live .k-panel__tag{background:var(--k-amber);color:var(--k-black)}

/* ---------- slab decoration ---------- */
.k-slab{
  position:absolute;
  inset:auto 0 0 auto;
  width:min(240px,42%);
  height:8px;
  background:var(--k-mint);
  transform:skewY(-6deg);
  transform-origin:right bottom;
  pointer-events:none;
  opacity:.85;
}
.k-slab--amber{background:var(--k-amber)}
.k-slab--blue{background:var(--k-blue)}

/* ---------- index grid ---------- */
.k-index{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:0;
  border-top:2px solid var(--k-black);
  border-left:2px solid var(--k-black);
}
.k-index__cell{
  border-right:2px solid var(--k-black);
  border-bottom:2px solid var(--k-black);
  padding:10px 14px;
  min-height:44px;
  display:flex;
  align-items:center;
  gap:12px;
  background:var(--k-ink-2);
  transition:background 160ms var(--k-ease);
}
.k-index__cell:hover{background:var(--k-ink-3)}
.k-index__key{
  font-family:var(--k-font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--k-blue);
  flex:0 0 auto;
}
.k-index__val{
  font-size:15px;
  color:var(--k-paper);
  min-width:0;
  overflow-wrap:anywhere;
}
.k-index__val a{color:var(--k-mint)}

/* ---------- numeric ---------- */
.k-num{
  font-family:var(--k-font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:-.01em;
}
.k-num--live{
  color:var(--k-amber);
  transition:filter 400ms var(--k-ease);
}
.k-num--live[data-pulse="on"]{filter:brightness(1.55)}

/* ---------- field label ---------- */
.k-field{
  font-family:var(--k-font-mono);
  font-size:12px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--k-blue);
}
.k-section--paper .k-field{color:var(--k-mint-dark)}

/* ---------- tags ---------- */
.k-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  font-family:var(--k-font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  border:1px solid currentColor;
  color:var(--k-muted);
  background:transparent;
  white-space:nowrap;
}
.k-tag--live{color:var(--k-amber);border-color:var(--k-amber)}
.k-tag--data{color:var(--k-blue);border-color:var(--k-blue)}
.k-tag--mint{color:var(--k-mint);border-color:var(--k-mint)}

/* ---------- prose / reading ---------- */
.k-prose{
  max-width:38em;
  font-size:var(--k-fs-16);
  line-height:1.8;
}
.k-prose h2,.k-prose h3{margin-top:1.6em}
.k-prose ul,.k-prose ol{padding-left:1.4em}
.k-prose li{margin:.35em 0}
.k-paper{background:var(--k-paper);color:var(--k-black)}
.k-paper a{color:var(--k-mint-dark)}
.k-paper a:hover{color:var(--k-black)}
.k-paper .k-field{color:var(--k-mint-dark)}

/* ---------- grid ---------- */
.k-grid{display:grid;gap:var(--k-gap)}
.k-grid--split{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.k-grid--split-rev{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.k-grid--index{grid-template-columns:repeat(3,minmax(0,1fr))}
.k-grid--duo{grid-template-columns:repeat(2,minmax(0,1fr))}
.k-grid--read{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}

/* ---------- figure ---------- */
.k-figure{
  position:relative;
  margin:0;
  overflow:hidden;
  background:linear-gradient(140deg,var(--k-ink-3),var(--k-ink-2) 55%,#174034);
  border:2px solid var(--k-black);
  box-shadow:var(--k-shadow-2);
  aspect-ratio:16/9;
}
.k-figure img{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
  transition:transform 320ms var(--k-ease);
}
.k-figure:hover img{transform:scale(1.02)}
.k-figure--tall{aspect-ratio:3/4}
.k-figure--wide{aspect-ratio:21/9}
.k-figure--square{aspect-ratio:1/1}
.k-figure__cap{
  position:absolute;
  inset:auto 0 0 0;
  padding:8px 12px;
  background:rgba(11,31,26,.86);
  color:var(--k-muted);
  font-size:12px;
  line-height:1.5;
  border-top:1px solid rgba(143,167,156,.3);
}
.k-figure--tilt{transform:rotate(-1.5deg)}

/* ---------- accordion ---------- */
.k-details{
  border:2px solid var(--k-black);
  background:var(--k-ink-2);
  margin:0 0 10px;
  transition:box-shadow 160ms var(--k-ease);
}
.k-details[open]{box-shadow:var(--k-shadow-1)}
.k-details summary{
  cursor:pointer;
  padding:14px 16px;
  font-family:var(--k-font-display);
  font-weight:700;
  font-size:var(--k-fs-16);
  list-style:none;
  display:flex;
  align-items:center;
  gap:12px;
}
.k-details summary::-webkit-details-marker{display:none}
.k-details summary::before{
  content:"+";
  font-family:var(--k-font-mono);
  color:var(--k-mint);
  font-size:18px;
  line-height:1;
  transition:transform 200ms var(--k-ease);
}
.k-details[open] summary::before{content:"–"}
.k-details__body{padding:0 16px 16px 40px;color:#CFE0D8;font-size:15px}
.k-section--paper .k-details,.k-panel--paper .k-details{background:transparent;border-color:var(--k-black)}
.k-section--paper .k-details__body{color:#3A322B}
.k-section--paper .k-details summary::before{color:var(--k-mint-dark)}

/* ---------- filter bar (page protocol) ---------- */
.k-filterbar{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding:14px 0;
  margin:0 0 18px;
  border-bottom:2px solid var(--k-black);
}
.k-filter{
  padding:6px 14px;
  font-family:var(--k-font-mono);
  font-size:12px;
  letter-spacing:.1em;
  text-transform:uppercase;
  background:transparent;
  color:var(--k-muted);
  border:1px solid rgba(143,167,156,.45);
  cursor:pointer;
  transition:background 160ms var(--k-ease),color 160ms var(--k-ease),border-color 160ms var(--k-ease);
}
.k-filter:hover{color:var(--k-mint);border-color:var(--k-mint)}
.k-filter[aria-pressed="true"]{
  background:var(--k-mint);
  color:var(--k-black);
  border-color:var(--k-black);
  box-shadow:var(--k-shadow-1);
}

/* ---------- footer ---------- */
.k-foot{
  grid-area:foot;
  background:var(--k-ink-2);
  border-top:2px solid var(--k-black);
  color:var(--k-paper);
  padding:clamp(28px,4vw,48px) var(--k-pad) 90px;
  position:relative;
}
.k-foot__grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1.4fr;
  gap:clamp(18px,3vw,36px);
  max-width:var(--k-max);
  margin:0 auto 28px;
}
.k-foot__col{min-width:0}
.k-foot__col--brand{display:flex;flex-direction:column;gap:10px}
.k-brand--foot{color:var(--k-paper)}
.k-brand--foot .k-brand__text{writing-mode:horizontal-tb;letter-spacing:.02em;font-size:18px;font-family:var(--k-font-display);font-weight:800}
.k-brand--foot .k-brand__mark{transform:skewY(-6deg)}
.k-foot__tagline{margin:0;font-size:14px;color:var(--k-mint);letter-spacing:.04em}
.k-foot__head{
  font-size:14px;
  font-family:var(--k-font-display);
  font-weight:700;
  letter-spacing:.02em;
  color:var(--k-paper);
  margin:0 0 12px;
  padding-bottom:8px;
  border-bottom:1px solid rgba(143,167,156,.3);
}
.k-foot__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.k-foot__link{color:#CFE0D8;font-size:14px;line-height:1.5}
.k-foot__link:hover{color:var(--k-mint);text-decoration:none}
.k-foot__contact{margin:0 0 8px;font-size:14px;color:#CFE0D8;line-height:1.6}
.k-foot__note{margin:8px 0 0;font-size:12px;line-height:1.6;color:var(--k-muted);letter-spacing:.01em}
.k-foot__legal{
  max-width:var(--k-max);
  margin:0 auto;
  padding-top:20px;
  border-top:2px solid var(--k-black);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 18px;
}
.k-foot__legal-links{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.k-foot__sep{color:var(--k-muted);opacity:.6}
.k-foot__meta{
  margin:0;
  font-family:var(--k-font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--k-muted);
}
.k-totop{
  position:fixed;
  right:18px;bottom:18px;
  z-index:100;
  padding:10px 16px;
  background:var(--k-mint);
  color:var(--k-black);
  border:2px solid var(--k-black);
  box-shadow:var(--k-shadow-1);
  font-family:var(--k-font-mono);
  font-size:12px;
  letter-spacing:.08em;
  cursor:pointer;
  opacity:0;
  transform:translateY(8px);
  pointer-events:none;
  transition:opacity 180ms var(--k-ease),transform 180ms var(--k-ease),background 160ms var(--k-ease);
}
.k-totop[data-visible="true"]{opacity:1;transform:translateY(0);pointer-events:auto}
.k-totop:hover{background:var(--k-amber)}

/* ---------- tablet ---------- */
@media (max-width:1080px){
  .k-topbar__utility{display:none}
  .k-foot__grid{grid-template-columns:1fr 1fr}
}
@media (max-width:960px){
  .k-grid--read{grid-template-columns:minmax(0,1fr)}
  .k-grid--split,.k-grid--split-rev{grid-template-columns:minmax(0,1fr)}
}

/* ---------- mobile ---------- */
@media (max-width:860px){
  :root{--k-rail:0px}
  .k-frame{
    grid-template-columns:minmax(0,1fr);
    grid-template-areas:
      "topbar"
      "body"
      "foot";
  }
  .k-rail{
    position:static;
    height:auto;
    width:100%;
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    padding:12px 16px;
    border-right:0;
    border-bottom:2px solid var(--k-black);
  }
  .k-rail .k-nav,.k-rail__note{display:none}
  .k-brand__text{writing-mode:horizontal-tb;letter-spacing:.04em;font-size:16px}
  .k-topbar{
    padding:12px 16px;
    position:sticky;
    top:0;
    gap:12px;
  }
  .k-topbar__line{font-size:13px}
  .k-topbar__tag{font-size:10px;letter-spacing:.1em}
  .k-topbar__cta{display:none}
  .k-nav-toggle{display:flex;margin-left:auto}
  .k-frame__body{padding:0 16px 0 0}
  .k-section{padding:28px 0 28px 16px}
  .k-breadcrumb{padding-left:16px}
  .k-index{grid-template-columns:minmax(0,1fr)}
  .k-foot__grid{grid-template-columns:minmax(0,1fr);gap:24px}
  .k-foot{padding-bottom:96px}
  .k-totop{right:12px;bottom:12px}
}
@media (max-width:520px){
  .k-index__cell{padding:8px 10px}
  .k-btn{width:100%}
  .k-topbar__brand{flex:1 1 auto}
  .k-figure--tall{aspect-ratio:4/5}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .k-panel:hover,.k-panel:focus-within,.k-nav__link:hover,.k-btn:hover,.k-figure:hover img{transform:none}
  .k-scroll-progress{transition:none}
}