/* LAB/IA landing page - tokens e fundacao
   Baseline v1.0: paleta, layout e motion em tokens unicos. */

:root{
  --ink:#080B12;
  --surface:#111725;
  --surface-2:#182235;
  --text:#F6F8FC;
  --muted:#A7B1C5;
  --cyan:#58E6FF;
  --violet:#9B7CFF;
  --lime:#C6F36B;
  --danger:#FF7C92;

  --line:rgba(246,248,252,.09);
  --line-strong:rgba(246,248,252,.16);

  --max:1180px;
  --gutter:32px;
  --r-card:20px;
  --r-btn:999px;
  --u:8px;

  --fast:160ms;
  --std:320ms;
  --reveal:560ms;
  --ease:cubic-bezier(.22,.8,.24,1);

  --font-display:"Space Grotesk",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-text:"Space Grotesk",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Consolas,monospace;

  --shadow-card:0 24px 60px -30px rgba(0,0,0,.9);
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-text);
  font-size:17px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

/* campos de atmosfera: gradientes fixos, sem repintar scroll */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(900px 520px at 78% -8%, rgba(155,124,255,.20), transparent 62%),
    radial-gradient(760px 460px at 8% 6%, rgba(88,230,255,.12), transparent 64%),
    radial-gradient(1200px 700px at 50% 108%, rgba(198,243,107,.06), transparent 60%);
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.5;
  background-image:
    linear-gradient(to right, rgba(246,248,252,.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(246,248,252,.035) 1px, transparent 1px);
  background-size:96px 96px;
  mask-image:radial-gradient(120% 90% at 50% 0%, #000 25%, transparent 78%);
  -webkit-mask-image:radial-gradient(120% 90% at 50% 0%, #000 25%, transparent 78%);
}

img,svg{display:block;max-width:100%}
a{color:inherit}
button{font:inherit;color:inherit}

::selection{background:rgba(198,243,107,.28);color:#fff}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:4px;
}

.skip{
  position:absolute;left:-9999px;top:0;
  background:var(--lime);color:#0a0d14;
  padding:12px 18px;border-radius:0 0 12px 0;font-weight:600;z-index:200;
}
.skip:focus{left:0}

/* barra de progresso de leitura */
.progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:120;
  background:transparent;
}
.progress__bar{
  height:100%;width:100%;
  transform-origin:0 50%;
  transform:scaleX(var(--p,0));
  background:linear-gradient(90deg,var(--cyan),var(--lime));
}
@supports (animation-timeline:scroll()){
  .progress__bar{transform:none;animation:progBar linear both;animation-timeline:scroll(root)}
}
@keyframes progBar{from{transform:scaleX(0)}to{transform:scaleX(1)}}

/* estrutura */
.wrap{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{position:relative;z-index:1;padding-block:clamp(72px,9vw,132px)}
.section--tight{padding-block:clamp(56px,6vw,84px)}
.rule{height:1px;background:var(--line);border:0;margin:0}

/* tipografia */
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  letter-spacing:-.03em;
  margin:0;
}
h1{font-size:clamp(2rem,3.5vw,3.05rem);line-height:1.04;letter-spacing:-.042em}
h2{font-size:clamp(1.85rem,3.1vw,2.75rem);line-height:1.03}
h3{font-size:clamp(1.1rem,1.5vw,1.32rem);line-height:1.2;letter-spacing:-.02em}
p{margin:0}

.lead{font-size:clamp(1.02rem,1.35vw,1.16rem);color:var(--muted);line-height:1.55;max-width:60ch}
.muted{color:var(--muted)}
.small{font-size:.84rem;line-height:1.5;color:var(--muted)}
.mono{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan)}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor;opacity:.7}

.grad{color:var(--text)}
.hl{color:var(--lime)}

/* botoes */
.btn{
  --bg:var(--lime);--fg:#0a0d14;
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:15px 26px;
  border:0;border-radius:var(--r-btn);
  background:var(--bg);color:var(--fg);
  font-weight:600;font-size:.98rem;letter-spacing:-.01em;
  text-decoration:none;cursor:pointer;
  transition:transform var(--fast) var(--ease),background var(--fast) var(--ease),box-shadow var(--fast) var(--ease);
  box-shadow:0 10px 30px -14px rgba(198,243,107,.75);
  white-space:nowrap;
}
.btn:hover{transform:translateY(-1px);background:#d3fa86;box-shadow:0 16px 40px -16px rgba(198,243,107,.85)}
.btn:active{transform:translateY(0) scale(.985)}
.btn svg{width:16px;height:16px;flex:none}

.btn--ghost{
  --bg:transparent;--fg:var(--text);
  border:1px solid var(--line-strong);
  box-shadow:none;
  padding:14px 22px;
  font-weight:500;
}
.btn--ghost:hover{background:rgba(246,248,252,.05);border-color:rgba(246,248,252,.3);box-shadow:none}

.btn--block{width:100%}
.btn[disabled]{opacity:.45;cursor:not-allowed;transform:none}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:8px;padding:0;margin:0;list-style:none}
.chip{
  font-size:.8rem;color:#d5dbe8;
  border:1px solid var(--line-strong);
  border-radius:999px;
  padding:6px 13px;
  background:rgba(24,34,53,.5);
  display:inline-flex;align-items:center;gap:8px;
}
.chip svg{width:13px;height:13px;color:var(--cyan)}

/* header */
.header{
  position:sticky;top:0;z-index:100;
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  background:rgba(8,11,18,.72);
  border-bottom:1px solid transparent;
  transition:border-color var(--std) var(--ease),background var(--std) var(--ease);
}
.header.is-stuck{border-bottom-color:var(--line);background:rgba(8,11,18,.9)}
.header__in{
  height:66px;display:flex;align-items:center;gap:28px;
}
.logo{
  display:inline-flex;align-items:center;gap:10px;
  font-weight:600;letter-spacing:-.02em;font-size:1.02rem;text-decoration:none;
  flex:none;
}
.logo__mark{
  width:26px;height:26px;border-radius:8px;flex:none;
  background:linear-gradient(140deg,var(--cyan),var(--violet) 58%,var(--lime));
  position:relative;
}
.logo__mark::after{
  content:"";position:absolute;inset:6px;border-radius:3px;
  background:var(--ink);
}
.logo__mark::before{
  content:"";position:absolute;inset:10px;border-radius:2px;
  background:var(--lime);z-index:1;
}
.nav{display:flex;align-items:center;gap:26px;margin-left:auto}
.nav a{
  font-size:.88rem;color:var(--muted);text-decoration:none;
  transition:color var(--fast) var(--ease);
  white-space:nowrap;
}
.nav a:hover{color:var(--text)}
.header .btn{padding:11px 20px;font-size:.86rem}
.nav__toggle{display:none}

@media (max-width:860px){
  .nav{display:none}
  .header__in{height:60px}
  .header .btn{padding:10px 16px;font-size:.82rem}
}