/* ============================================================
   HidirAi — site-visitka
   Design source of truth: ../HidirAi_pitch.html
   ============================================================ */

/* ---------- tokens ---------- */
:root{
  /* surfaces */
  --black:#000;
  --ink:#08090a;
  --ink-2:#0e0f11;
  --white:#fff;
  --paper:#fbfbfa;
  --line-d:rgba(255,255,255,.10);
  --line-l:rgba(0,0,0,.09);
  --ridge:rgba(255,255,255,.06);

  /* text */
  --t-hi:#fff;
  --t-mid:#8f8f93;
  --t-low:#5a5a5e;
  --t-hi-i:#04050a;
  --t-mid-i:#5c5c60;

  /* the single accent — used in exactly four places, nowhere else */
  --accent:#5b8cff;
  --accent-dim:rgba(91,140,255,.16);
  --accent-glow:rgba(91,140,255,.14);


  /* type */
  --sans:'Inter',-apple-system,BlinkMacSystemFont,system-ui,sans-serif;
  --mono:'JetBrains Mono','Noto Sans Mono',ui-monospace,SFMono-Regular,Menlo,monospace;

  --fs-display:clamp(56px,11.5vw,168px);
  --fs-h1:clamp(32px,4.5vw,64px);
  --fs-h3:clamp(17px,1.4vw,21px);
  --fs-body:clamp(15.5px,1.05vw,17px);
  --fs-sub:clamp(16px,1.45vw,22px);
  --fs-eyebrow:12.5px;
  --fs-mono:13.5px;

  /* space */
  --s1:4px; --s2:8px; --s3:12px; --s4:16px; --s5:24px;
  --s6:32px; --s7:48px; --s8:64px; --s9:96px;
  --sec-y:clamp(76px,10vh,140px);
  --gut:clamp(20px,6vw,88px);
  --maxw:1240px;

  /* easing — where the "premium" actually lives */
  --e-out:cubic-bezier(.22,.61,.36,1);
  --e-expo:cubic-bezier(.16,.9,.28,1);
  --e-spring:cubic-bezier(.2,1.4,.4,1);
  --e-io:cubic-bezier(.65,0,.35,1);

  --d-fast:.28s; --d-base:.6s; --d-slow:.9s; --d-xslow:1.15s;

  --sh-1:0 1px 2px rgba(0,0,0,.4);
  --sh-2:0 8px 24px rgba(0,0,0,.35);
  --sh-3:0 32px 64px rgba(0,0,0,.5);
  --sh-glow:0 0 0 1px var(--accent-dim), 0 16px 48px rgba(91,140,255,.10);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
body{
  background:var(--black);
  color:var(--t-hi);
  font-family:var(--sans);
  font-size:var(--fs-body);
  line-height:1.6;
  font-feature-settings:"kern" 1,"liga" 1;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

.mono{font-family:var(--mono);font-feature-settings:"tnum" 1;}
code.mono{font-size:.92em;}

a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
ul,ol{list-style:none;}
img,svg{display:block;max-width:100%;}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px;}

.skip{
  position:fixed;top:-100px;left:16px;z-index:200;
  padding:10px 16px;background:var(--white);color:var(--black);
  font-weight:600;font-size:14px;border-radius:6px;
  transition:top var(--d-fast) var(--e-out);
}
.skip:focus{top:16px;}

/* ---------- layout ---------- */
.wrap{
  width:100%;max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gut);
}

.sec{
  position:relative;
  padding-block:var(--sec-y);
  scroll-margin-top:64px;
}
.sec--dark{background:var(--black);color:var(--t-hi);}
.sec--paper{background:var(--paper);color:var(--t-hi-i);}
.sec--dark + .sec--dark{border-top:1px solid var(--ridge);}

/* keep tall, expensive lower sections out of the render path */
.sec{content-visibility:auto;contain-intrinsic-size:auto 720px;}
#hero{content-visibility:visible;}

/* ---------- shared type ---------- */
.eyebrow{
  font-size:var(--fs-eyebrow);
  font-weight:500;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:var(--t-low);
  margin-bottom:var(--s5);
}
.sec--paper .eyebrow{color:#9a9a9e;}

.h1{
  font-size:var(--fs-h1);
  font-weight:800;
  line-height:1.06;
  letter-spacing:-.032em;
  max-width:20ch;
}
.h1--narrow{max-width:16ch;}

.sub{
  font-size:var(--fs-sub);
  font-weight:400;
  line-height:1.5;
  color:var(--t-mid);
  margin-top:var(--s5);
  max-width:46ch;
}
.sub--wide{max-width:56ch;}
.sec--paper .sub{color:var(--t-mid-i);}

.display{
  font-size:var(--fs-display);
  font-weight:900;
  line-height:1.04;
  letter-spacing:-.045em;
}

.note{
  font-size:15px;
  line-height:1.65;
  color:var(--t-low);
  max-width:none;
}
.sec--paper .note{color:#6c6c70;}
.note--c{max-width:62ch;margin-top:var(--s7);}

/* ============ 1. HERO ============ */
.hero{
  min-height:100svh;
  display:flex;align-items:center;
  padding-block:120px var(--s9);
  overflow:hidden;
}
.hero__glow{
  position:absolute;
  width:min(1100px,120vw);height:min(1100px,120vw);
  left:50%;top:38%;
  transform:translate(-50%,-50%);
  background:radial-gradient(circle at 50% 50%,var(--accent-glow),transparent 62%);
  filter:blur(70px);
  opacity:.6;
  pointer-events:none;
  animation:drift 22s var(--e-io) infinite;
}
@keyframes drift{
  0%,100%{transform:translate(-50%,-50%) scale(1);}
  50%{transform:translate(-46%,-54%) scale(1.08);}
}
.hero .wrap{position:relative;z-index:1;}

/* the mask reveal: the word climbs out from behind a clipping edge */
.mask{
  display:block;
  overflow:hidden;
  /* a little breathing room or the ascenders of ӣ/ӯ clip at tight line-height */
  padding-block:.12em;
  margin-block:-.12em;
}
.wordmark{display:block;}

.hero__sub{max-width:42ch;}

.cta-row{
  display:flex;flex-wrap:wrap;gap:var(--s4);
  margin-top:var(--s7);
}
.cta-row--end{margin-top:var(--s8);justify-content:flex-start;}

.meta{
  display:flex;flex-wrap:wrap;gap:var(--s7);
  margin-top:var(--s9);
  padding-top:var(--s5);
  border-top:1px solid var(--line-d);
  max-width:760px;
}
.meta__item dt{
  font-size:11.5px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;
  color:var(--t-low);margin-bottom:6px;
}
.meta__item dd{font-size:14.5px;color:var(--t-mid);}
.meta__item a{transition:color var(--d-fast) var(--e-out);}
.meta__item a:hover{color:var(--t-hi);}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:15px 26px;
  border-radius:100px;
  font-size:15px;font-weight:600;letter-spacing:-.01em;
  border:1px solid transparent;
  transition:transform var(--d-fast) var(--e-out),
             background-color var(--d-fast) var(--e-out),
             border-color var(--d-fast) var(--e-out),
             box-shadow var(--d-fast) var(--e-out),
             color var(--d-fast) var(--e-out);
}
.btn__ico{width:16px;height:16px;transition:transform var(--d-fast) var(--e-out);}
.btn--solid{background:var(--white);color:var(--black);}
.btn--solid:hover{background:#efeff1;box-shadow:var(--sh-glow);transform:translateY(-2px);}
.btn--solid:hover .btn__ico{transform:translateX(3px);}
.btn--ghost{border-color:var(--line-d);color:var(--t-mid);}
.btn--ghost:hover{border-color:rgba(255,255,255,.3);color:var(--t-hi);transform:translateY(-2px);}
.sec--paper .btn--ghost{border-color:var(--line-l);color:var(--t-mid-i);}
.sec--paper .btn--ghost:hover{border-color:rgba(0,0,0,.25);color:var(--t-hi-i);}
.btn:active{transform:translateY(0);}

/* ============ 2. SPLIT / CODE WINDOW ============ */
.split{
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:clamp(32px,5vw,72px);
  align-items:center;
}
.split__text{min-width:0;}
.split__viz{min-width:0;}

.ticks{margin-top:var(--s6);display:grid;gap:var(--s3);}
.ticks li{
  position:relative;
  padding-left:var(--s5);
  font-size:15px;line-height:1.5;color:var(--t-mid-i);
}
.ticks li::before{
  content:"";position:absolute;left:0;top:.62em;
  width:8px;height:1px;background:currentColor;opacity:.55;
}
.sec--dark .ticks li{color:var(--t-mid);}

.window{
  background:var(--ink-2);
  border:1px solid var(--line-d);
  border-radius:12px;
  overflow:hidden;
  box-shadow:var(--sh-3);
}
.window__bar{
  display:flex;align-items:center;gap:7px;
  height:38px;padding:0 14px;
  background:#141517;
  border-bottom:1px solid var(--line-d);
}
.window__dot{width:10px;height:10px;border-radius:50%;background:#2f3134;}
.window__name{margin-left:auto;font-size:11.5px;color:var(--t-low);letter-spacing:.02em;}
.window__body{
  position:relative;
  padding:24px 26px;
  overflow:hidden;
}
.code{
  font-family:var(--mono);
  font-size:clamp(12px,1.15vw,14px);
  line-height:1.85;
  color:#c8c8cc;
  white-space:pre;
  overflow-x:auto;
  tab-size:4;
}
.code__clip{display:inline;}
.c-kw{color:#fff;font-weight:600;}
.c-fn{color:#e6e6e9;}
.c-cm{color:#5f6066;}
.c-str{color:#a8c4ff;}

.caret{
  display:inline-block;
  width:8px;height:1.05em;
  background:var(--accent);
  vertical-align:-.15em;
  opacity:0;
}
.caret.is-on{animation:blink 1s step-end infinite;}
@keyframes blink{50%{opacity:0;}}

.pill{
  display:inline-flex;align-items:center;gap:11px;
  margin-top:var(--s6);
  padding:10px 17px;
  border:1px solid var(--line-d);
  border-radius:100px;
  font-size:12.5px;color:var(--t-mid);
}
.sec--paper .pill{border-color:var(--line-l);color:var(--t-mid-i);}
.pill__dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 3px var(--accent-dim);
}
.pill__sep{width:1px;height:12px;background:currentColor;opacity:.22;}

/* ============ 3. DIAGRAM ============ */
.diagram{margin-top:var(--s8);}

.diagram__svg{width:100%;height:auto;overflow:visible;}

.edge{
  fill:none;stroke:#3d3f43;stroke-width:1.5;
  stroke-dasharray:1;stroke-dashoffset:1;
}
.node__ring{
  fill:#0c0d0f;stroke:#34363a;stroke-width:1.4;
  transform-box:fill-box;transform-origin:center;
  transform:scale(.7);opacity:0;
}
.node__t{font-family:var(--sans);font-size:15px;font-weight:600;fill:#fff;}
.node__t--sm{font-size:13px;}
.node__t--xs{font-size:11.5px;}
.node__s{font-family:var(--sans);font-size:11.5px;fill:var(--t-low);}
.core__disc{
  fill:var(--white);
  transform-box:fill-box;transform-origin:center;
  transform:scale(.7);opacity:0;
}
.core__t{font-family:var(--sans);font-size:18px;font-weight:800;fill:#000;}
.core__s{font-family:var(--sans);font-size:11.5px;font-weight:600;fill:#6a6a6e;}

.pulse{
  fill:none;stroke:var(--accent);stroke-width:2;stroke-linecap:round;
  stroke-dasharray:.06 .94;stroke-dashoffset:1;
  opacity:0;
}

/* ============ 4. STATS ============ */
.stats{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  margin-top:var(--s8);
  border-top:1px solid var(--line-l);
}
.stat{
  padding:var(--s6) var(--s5) var(--s4) 0;
  border-right:1px solid var(--line-l);
  contain:layout;
}
.stat:last-child{border-right:0;}
.stat__n{
  font-size:clamp(42px,4.6vw,72px);
  font-weight:800;
  line-height:1;
  letter-spacing:-.035em;
  color:var(--t-hi-i);
  font-variant-numeric:tabular-nums;
  /* fixed box so count-up never reflows the row */
  min-height:1em;
}
.stat__l{
  margin-top:var(--s4);
  font-size:14.5px;line-height:1.42;
  color:var(--t-mid-i);
  max-width:24ch;
}

.stats-note{
  margin-top:var(--s7);
  display:grid;gap:var(--s2);
  padding-top:var(--s5);
  border-top:1px solid var(--line-l);
}
.stats-note li{
  font-size:14.5px;color:#6c6c70;
  position:relative;padding-left:var(--s5);
}
.stats-note li::before{
  content:"";position:absolute;left:0;top:.66em;
  width:8px;height:1px;background:currentColor;opacity:.5;
}

/* ============ 5. CARDS ============ */
.cards{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  margin-top:var(--s8);
  background:var(--line-d);
  border:1px solid var(--line-d);
  border-radius:14px;
  overflow:hidden;
}
.card{
  background:var(--black);
  padding:var(--s6) var(--s5) var(--s5);
  display:flex;flex-direction:column;
  min-height:280px;
  transition:background-color var(--d-fast) var(--e-out),
             transform var(--d-base) var(--e-out);
}
.card:hover{background:var(--ink);transform:translateY(-4px);}
.card__idx{
  font-size:11.5px;color:var(--t-low);letter-spacing:.08em;
}
.card__t{
  margin-top:var(--s5);
  font-size:15.5px;font-weight:600;color:#fff;
  letter-spacing:-.01em;
  word-break:break-word;
}
/* push the footer metric to the bottom so cards end flush, while the titles
   still line up across the row regardless of description length */
.card__d{
  margin-top:var(--s4);
  font-size:14px;line-height:1.5;
  color:var(--t-mid);
}
.card__m{
  margin-top:auto; /* flush card bottoms regardless of description length */
  padding-top:var(--s4);
  border-top:1px solid var(--line-d);
  font-size:11.5px;color:var(--t-low);
}

/* ============ 6. TABS ============ */
.tabs{margin-top:var(--s8);}
.tabs__list{
  position:relative;
  display:flex;flex-wrap:wrap;gap:var(--s3) var(--s6);
  padding-bottom:var(--s4);
  border-bottom:1px solid var(--line-l);
}
.tab{
  position:relative;
  font-size:15px;font-weight:500;
  color:#9a9a9e;
  padding:6px 0;
  transition:color var(--d-fast) var(--e-out);
}
.tab:hover{color:var(--t-hi-i);}
.tab.is-active{color:var(--t-hi-i);font-weight:600;}
.tabs__bar{
  position:absolute;left:0;bottom:-1px;
  width:100%;height:1px;
  background:transparent;
}
.tabs__bar-fill{
  display:block;height:100%;width:0;
  background:var(--accent);
  transform-origin:left center;
}
.tabs__panels{margin-top:var(--s6);position:relative;min-height:80px;}
.panel__d{
  font-size:clamp(16px,1.4vw,20px);
  line-height:1.5;
  color:var(--t-mid-i);
  max-width:62ch;
}
.panel[hidden]{display:none;}

/* ============ 7. FLOW + MCP ============ */
.flow{margin-top:var(--s6);border-top:1px solid var(--line-d);}
.flow__s{
  display:flex;align-items:baseline;gap:var(--s5);
  padding:var(--s5) 0;
  border-bottom:1px solid var(--line-d);
  font-size:clamp(16px,1.3vw,19px);
}
.flow__i{font-size:12.5px;color:var(--t-low);width:2.6ch;flex:none;}

.mcp{
  margin-top:var(--s9);
  padding:clamp(28px,3.4vw,48px);
  border:1px solid var(--line-d);
  border-radius:16px;
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(91,140,255,.07), transparent 60%),
    var(--ink);
}
.mcp__head{display:flex;align-items:center;gap:var(--s4);}
.mcp__tag{
  font-size:11px;letter-spacing:.1em;font-weight:500;
  color:var(--accent);
  border:1px solid var(--accent-dim);
  border-radius:100px;
  padding:5px 11px;
}
.mcp__t{font-size:clamp(20px,2vw,28px);font-weight:700;letter-spacing:-.02em;}
.mcp__d{
  margin-top:var(--s5);
  font-size:clamp(15px,1.2vw,17px);
  line-height:1.62;
  color:var(--t-mid);
  max-width:76ch;
}

/* ============ 8. TIMELINE ============ */
.timeline{
  position:relative;
  margin-top:var(--s8);
  display:grid;gap:var(--s8);
  padding-left:clamp(20px,3vw,34px);
}
.timeline__line{
  position:absolute;
  left:0;top:6px;bottom:6px;
  width:1px;
  background:var(--line-l);
  transform-origin:top center;
}
.tl{position:relative;}
.tl__dot{
  position:absolute;
  left:calc(-1 * clamp(20px,3vw,34px) - 3.5px);
  top:7px;
  width:8px;height:8px;border-radius:50%;
  background:var(--paper);
  border:1px solid #b8b8bc;
}
.tl__dot--on{
  background:var(--accent);
  border-color:var(--accent);
  box-shadow:0 0 0 4px var(--accent-dim);
}
.tl__v{
  font-size:11.5px;letter-spacing:.1em;color:#9a9a9e;
}
.tl__n{
  margin-top:6px;
  font-size:clamp(20px,2vw,26px);
  font-weight:700;letter-spacing:-.02em;
  color:var(--t-hi-i);
}
.tl__list{margin-top:var(--s5);display:grid;gap:var(--s3);}
.tl__list li{
  position:relative;
  padding-left:var(--s5);
  font-size:15px;line-height:1.5;
  color:var(--t-mid-i);
}
.tl__list li::before{
  content:"";position:absolute;left:0;top:.62em;
  width:8px;height:1px;background:currentColor;opacity:.5;
}

/* ============ 9. TRUST ============ */
.trust-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:clamp(32px,5vw,80px);
  margin-top:var(--s8);
}
.trust__t{
  font-size:var(--fs-h3);
  font-weight:700;letter-spacing:-.015em;
  padding-bottom:var(--s4);
  border-bottom:1px solid var(--line-d);
}
.trust__list{margin-top:var(--s5);display:grid;gap:var(--s4);}
.trust__list li{
  position:relative;
  padding-left:var(--s5);
  font-size:15px;line-height:1.55;
  color:var(--t-mid);
}
.trust__list li::before{
  content:"";position:absolute;left:0;top:.64em;
  width:8px;height:1px;background:currentColor;opacity:.55;
}
.trust__c{
  display:inline-block;
  margin-top:var(--s6);
  padding:9px 15px;
  border:1px solid var(--line-d);
  border-radius:100px;
  font-size:12.5px;color:var(--t-mid);
}
.trust__disclaimer{
  margin-top:var(--s6);
  padding:var(--s5);
  border-left:2px solid var(--accent);
  background:rgba(255,255,255,.03);
  font-size:14.5px;line-height:1.55;
  color:var(--t-mid);
}

/* ============ 10. DEMO ============ */
.sec--close{padding-bottom:var(--s9);}

.chat{
  margin-top:var(--s8);
  max-width:640px;
  background:var(--ink-2);
  border:1px solid var(--line-d);
  border-radius:14px;
  overflow:hidden;
  box-shadow:var(--sh-3);
}
.chat__bar{
  display:flex;align-items:center;gap:7px;
  padding:0 16px;
  height:48px;
  background:#141517;
  border-bottom:1px solid var(--line-d);
}
.chat__id{
  margin-left:10px;
  display:flex;flex-direction:column;line-height:1.25;
}
.chat__name{font-size:13.5px;font-weight:600;color:#fff;}
.chat__handle{font-size:11px;color:var(--t-low);}
.chat__badge{
  margin-left:auto;
  font-size:10px;letter-spacing:.1em;
  color:var(--t-low);
  border:1px solid var(--line-d);
  border-radius:100px;
  padding:4px 9px;
}

.chat__screen{
  padding:var(--s5) var(--s5) var(--s6);
  display:flex;flex-direction:column;gap:var(--s3);
  min-height:264px;
}
.msg{
  max-width:82%;
  padding:11px 15px;
  border-radius:14px;
  font-size:14.5px;line-height:1.5;
}
.msg--out{
  align-self:flex-end;
  background:#26282c;
  color:#fff;
  border-bottom-right-radius:5px;
}
.msg--in{
  align-self:flex-start;
  background:#17181b;
  border:1px solid var(--line-d);
  color:#dcdce0;
  border-bottom-left-radius:5px;
}
.msg--in.is-thinking{color:var(--t-low);}
.msg__extra{margin-top:10px;}

.trace{
  align-self:flex-start;
  font-size:11.5px;
  color:var(--t-low);
  padding-left:2px;
}
.trace b{color:var(--accent);font-weight:500;}

.wcard{
  border:1px solid var(--line-d);
  border-radius:10px;
  overflow:hidden;
  background:#0e0f11;
}

.chat__foot{
  display:flex;align-items:center;gap:var(--s3);
  flex-wrap:wrap;
  padding:var(--s4) var(--s5);
  border-top:1px solid var(--line-d);
  background:#0b0c0e;
}
.chat__scen{display:flex;gap:var(--s2);}
.chip{
  font-size:12.5px;
  color:var(--t-mid);
  border:1px solid var(--line-d);
  border-radius:100px;
  padding:7px 14px;
  transition:color var(--d-fast) var(--e-out),
             border-color var(--d-fast) var(--e-out),
             background-color var(--d-fast) var(--e-out);
}
.chip:hover{color:var(--t-hi);border-color:rgba(255,255,255,.24);}
.chip.is-active{color:#fff;border-color:var(--accent-dim);background:var(--accent-dim);}
.chip--ghost{margin-left:auto;}

.chat__note{
  padding:var(--s4) var(--s5);
  border-top:1px solid var(--line-d);
  background:#0b0c0e;
  font-size:12.5px;line-height:1.55;
  color:var(--t-low);
}

/* ============ FOOTER ============ */
.foot{
  border-top:1px solid var(--ridge);
  padding-block:var(--s6);
  background:var(--black);
}
.foot__in{
  display:flex;align-items:center;gap:var(--s5);
  flex-wrap:wrap;
  justify-content:space-between;
}
.foot__brand{
  display:flex;align-items:center;gap:9px;
  font-size:15px;font-weight:800;letter-spacing:-.02em;
}
.foot__logo{width:22px;height:22px;flex:none;border-radius:6px;}
.foot__links{display:flex;gap:var(--s5);flex-wrap:wrap;}
.foot__links a{
  font-size:13.5px;color:var(--t-low);
  transition:color var(--d-fast) var(--e-out);
}
.foot__links a:hover{color:var(--t-hi);}
.foot__meta{font-size:11.5px;color:#45464a;letter-spacing:.02em;}

/* ============ TOPBAR ============ */
.topbar{
  position:fixed;
  inset:0 0 auto;
  z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  gap:var(--s5);
  padding:14px var(--gut);
  transition:background-color var(--d-fast) var(--e-out),
             border-color var(--d-fast) var(--e-out),
             backdrop-filter var(--d-fast) var(--e-out);
  border-bottom:1px solid transparent;
}
.topbar.is-stuck{
  background:rgba(0,0,0,.62);
  backdrop-filter:blur(14px) saturate(1.4);
  -webkit-backdrop-filter:blur(14px) saturate(1.4);
  border-bottom-color:var(--line-d);
}
.topbar__brand{
  display:flex;align-items:center;gap:9px;
  font-size:14px;font-weight:700;letter-spacing:-.02em;
}
.topbar__logo{
  width:26px;height:26px;flex:none;
  border-radius:7px;
  transition:transform var(--d-base) var(--e-spring);
}
.topbar__brand:hover .topbar__logo{transform:scale(1.08);}
.topbar__name{opacity:0;transition:opacity var(--d-base) var(--e-out);}
.topbar.is-stuck .topbar__name{opacity:1;}

.langs{
  position:relative;
  display:flex;
  border:1px solid var(--line-d);
  border-radius:100px;
  padding:3px;
  background:rgba(255,255,255,.02);
}
.langs__btn{
  position:relative;z-index:1;
  padding:6px 13px;
  font-family:var(--mono);
  font-size:11.5px;letter-spacing:.04em;
  color:var(--t-low);
  border-radius:100px;
  transition:color var(--d-fast) var(--e-out);
}
.langs__btn:hover{color:var(--t-mid);}
.langs__btn.is-active{color:#fff;}
.langs__pill{
  position:absolute;z-index:0;
  top:3px;left:3px;
  height:calc(100% - 6px);
  border-radius:100px;
  background:rgba(255,255,255,.11);
  transition:transform var(--d-base) var(--e-expo),
             width var(--d-base) var(--e-expo);
}

/* ============ reveal engine ============ */
[data-anim]{opacity:0;}
[data-anim="rise"]{transform:translateY(26px);}
[data-anim="fade"]{transform:none;}
[data-anim="left"]{transform:translateX(-22px);}
[data-anim="mask"]{transform:translateY(105%);opacity:1;}

[data-anim]{
  transition:
    opacity var(--d-base) var(--e-out) calc(var(--stagger,0) * 1ms),
    transform var(--d-base) var(--e-out) calc(var(--stagger,0) * 1ms);
}
[data-anim="mask"]{
  transition:transform var(--d-xslow) var(--e-expo) calc(var(--stagger,0) * 1ms);
}
.is-in [data-anim="mask"]{transform:translateY(0);}
.is-in [data-anim]{opacity:1;transform:none;}

.is-animating{will-change:transform,opacity;}

/* ---------- per-section choreography ---------- */

/* hero */
.hero .eyebrow[data-anim]{--stagger:0;}
.hero__sub[data-anim]{--stagger:420;}
.hero .cta-row[data-anim]{--stagger:560;}
.hero .meta[data-anim]{--stagger:760;}

/* code window typing is driven by JS; nothing to delay here */
.split__viz[data-anim]{--stagger:180;}
.about-sub{--stagger:120;}

/* diagram */
.edge{transition:stroke-dashoffset var(--d-xslow) var(--e-io) calc(var(--stagger,0) * 1ms);}
.is-in .edge{stroke-dashoffset:0;}
.node__ring{transition:transform .55s var(--e-spring) calc(var(--stagger,0) * 1ms),
                        opacity .35s linear calc(var(--stagger,0) * 1ms);}
.is-in .node__ring{transform:scale(1);opacity:1;}
.core__disc{transition:transform .6s var(--e-spring) calc(var(--stagger,0) * 1ms),
                        opacity .35s linear calc(var(--stagger,0) * 1ms);}
.is-in .core__disc{transform:scale(1);opacity:1;}

/* timeline line grows, then the rows are revealed by the section's own cascade */
.timeline__line{transform:scaleY(0);transition:transform var(--d-xslow) var(--e-out);}
.is-in .timeline__line{transform:scaleY(1);}

/* tabs progress bar */
.tabs__bar-fill{transition:transform .12s linear;}

/* stat cells: stagger set in JS; hairline top grows first */
.stats{border-top-color:transparent;transition:border-color var(--d-base) var(--e-out);}
.is-in .stats{border-top-color:var(--line-l);}

/* ---------- language-specific typography ---------- */
/* Tajik Cyrillic has taller ascenders (ӣ, ӯ) that clip at tight line-heights,
   and its letterforms are wider, so the Latin negative tracking reads cramped. */
html[lang="tg"] .display{line-height:1.12;letter-spacing:-.032em;}
html[lang="tg"] .h1{line-height:1.14;letter-spacing:-.022em;}
html[lang="tg"] .mask{padding-block:.2em;margin-block:-.2em;}
html[lang="tg"] .hero__glow{opacity:.5;}
/* JetBrains Mono has no Tajik glyphs at all — Noto Sans Mono covers them */
html[lang="tg"] .mono,
html[lang="tg"] .code,
html[lang="tg"] .eyebrow{
  font-family:'Noto Sans Mono','JetBrains Mono',ui-monospace,monospace;
}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .split{grid-template-columns:1fr;gap:var(--s8);}
  .cards{grid-template-columns:repeat(2,1fr);}
  .stats{grid-template-columns:repeat(2,1fr);}
  .stat{border-right:0;border-bottom:1px solid var(--line-l);padding-right:var(--s5);}
  .stat:nth-child(odd){border-right:1px solid var(--line-l);}
  .stat:nth-last-child(-n+2){border-bottom:0;}
}
@media (max-width:760px){
  .cards{grid-template-columns:1fr;}
  .card{min-height:0;}
  .card__t{margin-top:var(--s5);}
  .trust-grid{grid-template-columns:1fr;gap:var(--s8);}
  .meta{gap:var(--s5) var(--s6);}
  .topbar{padding:11px var(--gut);}
  .topbar__name{display:none;}
  .chat__screen{min-height:230px;padding:var(--s4);}
  .msg{max-width:90%;}
  .foot__in{justify-content:flex-start;}
  .meta__item dd{font-size:13.5px;word-break:break-word;}
}
@media (max-width:420px){
  .stats{grid-template-columns:1fr;}
  .stat{border-right:0 !important;border-bottom:1px solid var(--line-l);}
  .stat:last-child{border-bottom:0;}
  .btn{padding:14px 20px;font-size:14.5px;width:100%;justify-content:center;}
  .cta-row{gap:var(--s3);}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    transition-delay:0ms !important;
  }
  /* force the visible end state — otherwise the page renders blank */
  [data-anim]{opacity:1 !important;transform:none !important;}
  .edge{stroke-dashoffset:0 !important;}
  .node__ring,.core__disc{transform:scale(1) !important;opacity:1 !important;}
  .timeline__line{transform:scaleY(1) !important;}
  .hero__glow{animation:none;}
}