/* Frontier Labs — frontier-labs.in
   Design language: precision instruments. The flagship product is named for the
   Sanskrit for "proof", so the page borrows the vocabulary of measurement and
   verification rather than generic technology decoration. */

@font-face{font-family:"Inter var";src:url("/assets/fonts/InterVariable.woff2") format("woff2");font-weight:100 900;font-display:swap}
@font-face{font-family:"JBMono";src:url("/assets/fonts/JetBrainsMono.woff2") format("woff2");font-weight:400;font-display:swap}

:root{
	--ink:#0a1120;
	--ink-2:#0e1626;
	--navy:#1b2740;
	--blue:#2570fb;
	--sky:#3b9cfc;
	--deep:#1e5fe8;
	--paper:#f7f9fc;
	--muted:#5b6a83;
	--line:#dde5f0;
	--line-d:rgb(255 255 255/.12);
	--sans:"Inter var",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
	--mono:"JBMono",ui-monospace,SFMono-Regular,Menlo,monospace;
	--gutter:clamp(1.25rem,5vw,5rem);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
	margin:0;background:var(--paper);color:var(--navy);
	font-family:var(--sans);font-size:clamp(1rem,.95rem + .25vw,1.0625rem);
	line-height:1.6;-webkit-font-smoothing:antialiased;
	font-feature-settings:"cv05" 1,"ss03" 1;
	overflow-x:hidden;
}
img,svg{max-width:100%;height:auto}
a{color:var(--deep);text-underline-offset:.2em}
:focus-visible{outline:2px solid var(--sky);outline-offset:3px;border-radius:2px}
.skip{position:absolute;left:-9999px;background:var(--ink);color:#fff;padding:.75rem 1rem;z-index:100}
.skip:focus{left:1rem;top:1rem}
.mono{font-family:var(--mono);font-size:.8125rem;letter-spacing:.02em}
.center{text-align:center}

.wrap{width:min(100% - var(--gutter)*2,78rem);margin-inline:auto}
.wrap--narrow{width:min(100% - var(--gutter)*2,50rem)}

/* ---------------- nav: shrinks on scroll via a scroll-progress timeline ---- */
.nav{
	position:sticky;top:0;z-index:60;display:flex;align-items:center;
	gap:clamp(1rem,3vw,2.5rem);padding:1.15rem var(--gutter);
	background:rgb(10 17 32/.72);backdrop-filter:blur(16px) saturate(140%);
	border-bottom:1px solid transparent;
}
.nav__brand{display:flex;align-items:center;gap:.65rem;text-decoration:none}
.nav__name{color:#fff;font-weight:600;letter-spacing:.16em;text-transform:uppercase;font-size:.74rem}
.nav nav{margin-left:auto;display:flex;gap:clamp(.9rem,2.4vw,2rem)}
.nav nav a{color:rgb(255 255 255/.66);text-decoration:none;font-size:.82rem;letter-spacing:.03em;transition:color .2s}
.nav nav a:hover{color:#fff}
@media (max-width:52rem){.nav nav{display:none}.nav .btn--sm{margin-left:auto}}

@media (prefers-reduced-motion:no-preference){
	@supports ((animation-timeline:scroll()) and (animation-range:0% 100%)){
		@keyframes navshrink{
			to{padding-block:.6rem;background:rgb(10 17 32/.94);border-bottom-color:var(--line-d)}
		}
		.nav{animation:navshrink linear both}
		.nav{animation-timeline:scroll();animation-range:0 220px}
	}
}

/* ---------------- buttons ---------------- */
.btn{
	display:inline-block;padding:.85rem 1.45rem;background:var(--blue);color:#fff;
	font-weight:550;font-size:.92rem;text-decoration:none;border:1px solid var(--blue);
	position:relative;overflow:hidden;
	transition:background .2s,transform .2s,box-shadow .2s;
}
.btn:hover{background:var(--deep);transform:translateY(-2px);box-shadow:0 10px 30px -10px rgb(37 112 251/.6)}
.btn--ghost{background:transparent;color:var(--sky);border-color:var(--line-d)}
.btn--ghost:hover{background:rgb(59 156 252/.1);color:#fff;border-color:var(--sky);box-shadow:none}
.btn--sm{padding:.55rem 1rem;font-size:.8rem}
.btn--lg{padding:1rem 1.8rem;font-size:.97rem}

/* ---------------- hero ---------------- */
.hero{
	position:relative;background:var(--ink);color:#fff;overflow:clip;isolation:isolate;
	padding:clamp(5rem,13vw,9.5rem) var(--gutter) clamp(6rem,12vw,8rem);
	min-height:min(92svh,60rem);display:flex;flex-direction:column;justify-content:center;
}
/* Engineering grid — the drafting-paper substrate the whole identity sits on. */
.grid-bg{
	position:absolute;inset:0;z-index:0;opacity:.5;
	background-image:linear-gradient(var(--line-d) 1px,transparent 1px),
	                 linear-gradient(90deg,var(--line-d) 1px,transparent 1px);
	background-size:64px 64px;
	mask-image:radial-gradient(ellipse 90% 70% at 30% 40%,#000 20%,transparent 75%);
}
/* Pointer-reactive glow. Falls back to a static position with no JS. */
.glow{
	position:absolute;z-index:0;inset:0;pointer-events:none;
	background:radial-gradient(38rem 38rem at var(--mx,26%) var(--my,32%),
	           rgb(37 112 251/.20),transparent 65%);
	transition:background .35s ease-out;
}
.hero__inner{position:relative;z-index:3;width:min(100%,78rem);margin-inline:auto}

.readout{
	display:flex;flex-wrap:wrap;align-items:center;gap:.35rem 1.1rem;
	font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;
	color:rgb(255 255 255/.4);margin:0 0 clamp(1.75rem,4vw,2.5rem);
	padding-bottom:.9rem;border-bottom:1px solid var(--line-d);
}
.readout__k{color:var(--sky)}
.pulse{width:7px;height:7px;border-radius:50%;background:#34d399;margin-left:auto}
@media (prefers-reduced-motion:no-preference){
	.pulse{animation:beat 2.4s ease-in-out infinite}
	@keyframes beat{0%,100%{opacity:1;box-shadow:0 0 0 0 rgb(52 211 153/.6)}50%{opacity:.55;box-shadow:0 0 0 7px rgb(52 211 153/0)}}
}

.hero__h1{
	margin:0;font-size:clamp(2.8rem,1rem + 8.4vw,7.5rem);line-height:.96;
	letter-spacing:-.045em;font-weight:640;text-wrap:balance;
}
.hero__h1 em{
	font-style:normal;
	background:linear-gradient(96deg,var(--sky),var(--blue) 55%,#8b5cf6);
	-webkit-background-clip:text;background-clip:text;color:transparent;
}
/* Masked per-line reveal on load: each line rises out of its own clip box. */
.line{display:block;overflow:hidden}
.line>span{display:block}
@media (prefers-reduced-motion:no-preference){
	.line>span{animation:lineup .95s cubic-bezier(.16,1,.3,1) backwards}
	.line:nth-child(1)>span{animation-delay:.05s}
	.line:nth-child(2)>span{animation-delay:.16s}
	@keyframes lineup{from{transform:translateY(105%)}}
}

.hero__lede{margin:clamp(1.5rem,3vw,2.1rem) 0 0;max-width:46ch;color:rgb(255 255 255/.68);font-size:clamp(1.05rem,.95rem + .5vw,1.3rem)}
.hero__cta{display:flex;flex-wrap:wrap;gap:.8rem;margin:clamp(2rem,4vw,2.75rem) 0 0}
.hero__cta--center{justify-content:center}
.hero__chips{list-style:none;display:flex;flex-wrap:wrap;gap:.5rem;padding:0;margin:2.25rem 0 0}
.hero__chips li{
	font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;
	color:rgb(255 255 255/.5);border:1px solid var(--line-d);padding:.35rem .7rem;border-radius:999px;
}

.orbit{position:absolute;inset-block:-12%;inset-inline-end:-12%;width:min(60vw,42rem);z-index:1;pointer-events:none;opacity:.9}
.orbit__dot{offset-path:path("M 50 300 A 250 152 -28 1 1 550 300 A 250 152 -28 1 1 50 300");filter:drop-shadow(0 0 10px #3b9cfc)}
@media (prefers-reduced-motion:no-preference){
	.orbit__dot{animation:trace 26s linear infinite}
	@keyframes trace{to{offset-distance:100%}}
}
@media (max-width:52rem){.orbit{opacity:.35;inset-inline-end:-40%}}

.scrollcue{
	position:absolute;bottom:1.8rem;left:50%;translate:-50% 0;z-index:3;margin:0;
	font-family:var(--mono);font-size:.62rem;letter-spacing:.24em;text-transform:uppercase;
	color:rgb(255 255 255/.35);display:flex;align-items:center;gap:.6rem;
}
.scrollcue span{width:1px;height:34px;background:linear-gradient(rgb(255 255 255/.5),transparent)}
@media (prefers-reduced-motion:no-preference){
	.scrollcue span{animation:drop 2s ease-in-out infinite}
	@keyframes drop{0%,100%{opacity:.25;transform:scaleY(.5);transform-origin:top}50%{opacity:1;transform:scaleY(1)}}
}

/* ---------------- scrollytelling ----------------
   Each text panel declares a named view-timeline; the pinned stage animates
   against those timelines. timeline-scope hoists the names so the stage — which
   is NOT a descendant of the panels — can reference them. */
.story{background:var(--ink-2);color:#fff;padding:clamp(3rem,8vw,6rem) 0 clamp(4rem,10vw,8rem)}
.story__grid{display:grid;gap:clamp(2rem,5vw,5rem);grid-template-columns:1fr}
@media (min-width:62rem){.story__grid{grid-template-columns:1fr 1fr;align-items:start}}

.story__stage{position:sticky;top:22vh;height:min(52vh,26rem);display:grid;place-items:center}
@media (max-width:62rem){.story__stage{position:static;height:16rem;margin-bottom:1rem}}
.stage{position:relative;width:min(80%,22rem);aspect-ratio:1;display:grid;place-items:center}
.stage__ring{
	position:absolute;inset:0;border:1px solid var(--line-d);border-radius:50%;
	background:radial-gradient(circle at 50% 50%,rgb(37 112 251/.14),transparent 62%);
}
.stage__ring::after{
	content:"";position:absolute;inset:14%;border:1px dashed rgb(59 156 252/.28);border-radius:50%;
}
@media (prefers-reduced-motion:no-preference){
	.stage__ring::after{animation:spin 30s linear infinite}
	@keyframes spin{to{rotate:360deg}}
}
.stage__core{position:relative;display:grid;place-items:center;text-align:center}
.stage__label{
	grid-area:1/1;font-family:var(--mono);font-size:clamp(.85rem,.6rem + 1vw,1.35rem);
	letter-spacing:.14em;color:var(--sky);opacity:0;
}
.stage__label[data-stage="1"]{opacity:1}
.stage__scan{
	position:absolute;inset-inline:6%;height:1px;top:50%;
	background:linear-gradient(90deg,transparent,var(--sky),transparent);opacity:.7;
}
@media (prefers-reduced-motion:no-preference){
	.stage__scan{animation:scan 4.5s ease-in-out infinite}
	@keyframes scan{0%,100%{transform:translateY(-90px)}50%{transform:translateY(90px)}}
}

.story__panels{display:grid;gap:clamp(4rem,18vh,14rem)}
.panel-step{max-width:34rem}

@media (prefers-reduced-motion:no-preference){
	@supports ((animation-timeline:view()) and (animation-range:entry)){
		html{timeline-scope:--s1,--s2,--s3,--s4}
		#panels .panel-step:nth-child(1){view-timeline:--s1 block}
		#panels .panel-step:nth-child(2){view-timeline:--s2 block}
		#panels .panel-step:nth-child(3){view-timeline:--s3 block}
		#panels .panel-step:nth-child(4){view-timeline:--s4 block}

		@keyframes show{from{opacity:0}25%,75%{opacity:1}to{opacity:0}}
		.stage__label[data-stage="1"]{animation:show auto linear both;animation-timeline:--s1;animation-range:cover}
		.stage__label[data-stage="2"]{animation:show auto linear both;animation-timeline:--s2;animation-range:cover}
		.stage__label[data-stage="3"]{animation:show auto linear both;animation-timeline:--s3;animation-range:cover}
		.stage__label[data-stage="4"]{animation:show auto linear both;animation-timeline:--s4;animation-range:cover}

		@keyframes panelin{from{opacity:0;transform:translateY(34px)}}
		.panel-step{animation:panelin .9s ease-out backwards;animation-timeline:view();animation-range:entry 0% cover 30%}
	}
}

/* ---------------- bands ---------------- */
.band{padding:clamp(4.5rem,10vw,8rem) 0;border-bottom:1px solid var(--line);position:relative;content-visibility:auto;contain-intrinsic-size:auto 760px}
.band--ink{background:var(--ink);color:#fff;border-bottom-color:var(--line-d)}
.band--close{border-bottom:0}
.band>.wrap{position:relative}
.band>.wrap::before{
	content:"";position:absolute;inset-block:-1.5rem;inset-inline-start:calc(var(--gutter)*-.55);width:7px;
	background:repeating-linear-gradient(to bottom,currentColor 0 1px,transparent 1px 11px);opacity:.15;
}
@media (max-width:66rem){.band>.wrap::before{display:none}}

.eyebrow{font-family:var(--mono);font-size:.68rem;letter-spacing:.2em;text-transform:uppercase;color:var(--blue);margin:0 0 1rem}
.eyebrow--light{color:var(--sky)}
.h2{margin:0 0 1rem;font-size:clamp(1.8rem,1.1rem + 2.8vw,3.2rem);line-height:1.06;letter-spacing:-.032em;font-weight:620;text-wrap:balance}
.h2--light{color:#fff}
.xl{font-size:clamp(2.2rem,1.2rem + 4.4vw,4.5rem)}
.lede{max-width:62ch;color:var(--muted);font-size:1.06rem;margin:0 0 1.5rem}
.lede--light{color:rgb(255 255 255/.66)}
.lede--wide{max-width:70ch;font-size:clamp(1.05rem,.95rem + .4vw,1.2rem)}
.lede em{font-style:normal;color:var(--sky)}
.lede strong{color:#fff;font-weight:600}

.claim{font-size:clamp(1rem,.95rem + .4vw,1.25rem);color:rgb(255 255 255/.8);margin:0 0 1.5rem}
.claim em{font-style:normal;color:var(--sky);font-weight:500}
.claim span{font-style:italic;color:rgb(255 255 255/.5)}

.note{font-family:var(--mono);font-size:.76rem;color:rgb(255 255 255/.42);border-inline-start:2px solid var(--sky);padding-inline-start:.9rem;margin:0 0 2rem}

/* ---------------- capability cards ---------------- */
.caps{display:grid;gap:1px;background:var(--line-d);border:1px solid var(--line-d);
	grid-template-columns:repeat(auto-fit,minmax(min(100%,17rem),1fr));margin:clamp(2.5rem,5vw,3.5rem) 0}
.cap{background:var(--ink);padding:1.8rem 1.5rem;position:relative;transition:background .3s}
.cap:hover{background:var(--ink-2)}
.cap__n{font-family:var(--mono);font-size:.66rem;letter-spacing:.16em;color:var(--sky);opacity:.65}
.cap__h{margin:.7rem 0 .7rem;font-size:1.02rem;font-weight:600;color:#fff;letter-spacing:-.01em}
.cap p{margin:0;font-size:.92rem;color:rgb(255 255 255/.6);line-height:1.66}

.statline{display:grid;gap:1.5rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,13rem),1fr));
	margin:clamp(2rem,5vw,3rem) 0;padding-block:2rem;border-block:1px solid var(--line-d)}
.stat__v{display:block;font-size:clamp(2rem,1.4rem + 2.4vw,3.4rem);font-weight:650;letter-spacing:-.04em;
	background:linear-gradient(100deg,var(--sky),var(--blue));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat__l{display:block;font-size:.82rem;color:rgb(255 255 255/.5);margin-top:.4rem;max-width:22ch}

/* ---------------- practice / company ---------------- */
.split{display:grid;gap:clamp(1.5rem,4vw,3rem);grid-template-columns:repeat(auto-fit,minmax(min(100%,22rem),1fr));margin-top:clamp(2rem,5vw,3.5rem)}
.mode{border-top:2px solid var(--navy);padding-top:1.5rem}
.mode__h{margin:0 0 .75rem;font-size:1.3rem;font-weight:620;letter-spacing:-.018em}
.mode p{margin:0 0 1rem;color:var(--muted)}
.mode__meta{display:flex;flex-wrap:wrap;gap:.5rem}
.mode__meta span{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--blue);border:1px solid var(--line);padding:.3rem .6rem}

.panel{margin:clamp(2rem,5vw,3rem) 0 0;display:grid;gap:1px;background:var(--line);border:1px solid var(--line);
	grid-template-columns:repeat(auto-fit,minmax(min(100%,15rem),1fr))}
.panel>div{background:var(--paper);padding:1.5rem;transition:background .25s}
.panel>div:hover{background:#fff}
.panel dt{font-family:var(--mono);font-size:.64rem;letter-spacing:.15em;text-transform:uppercase;color:var(--muted);margin-bottom:.5rem}
.panel dd{margin:0;font-weight:500;line-height:1.5}
.panel dd.mono{font-weight:400}

/* ---------------- footer ---------------- */
.foot{background:var(--ink);color:rgb(255 255 255/.5);padding:clamp(3rem,7vw,5rem) 0}
.foot__inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:2rem}
.foot img{filter:brightness(0) invert(1);opacity:.85}
.foot__meta{margin:0;line-height:1.8}
.foot a{color:var(--sky)}

/* ---------------- generic reveal for standard bands ---------------- */
@media (prefers-reduced-motion:no-preference){
	@supports ((animation-timeline:view()) and (animation-range:entry)){
		@keyframes rise{from{opacity:0;transform:translateY(26px)}}
		.band .wrap>*{animation:rise .9s ease-out backwards;animation-timeline:view();animation-range:entry 0% cover 28%}
	}
}