/* ─── A Descida · Nirvana-OS ────────────────────────────────────────── */

:root{
  --obsidian:#0B0A09;
  --stone:#151311;
  --bone:#EDE6D8;
  --amber:#E4A33C;
  --verdigris:#7FB8A8;
  --ash:#A9A29A;
  --rule:rgba(237,230,216,.14);

  --display:'Instrument Serif',Georgia,'Times New Roman',serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:'Inter Tight',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;

  --act-scroll:340vh;
  --gut:clamp(1.25rem,5vw,5.5rem);
  --hud-lane:0rem;
  --ease:cubic-bezier(.22,.61,.36,1);
}
/* o profundímetro só existe quando há largura para lhe dar uma faixa própria */
@media (min-width:64rem){:root{--hud-lane:9.5rem}}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--obsidian);
  color:var(--bone);
  font-family:var(--sans);
  font-size:clamp(1rem,.94rem + .3vw,1.1rem);
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img,video{display:block;max-width:100%}
code{font-family:var(--mono);font-size:.9em;color:var(--amber)}
b{font-weight:600}
::selection{background:var(--amber);color:var(--obsidian)}

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

.skip{
  position:absolute;left:.75rem;top:-4rem;z-index:100;
  background:var(--bone);color:var(--obsidian);
  padding:.6rem 1rem;border-radius:2px;
  font-family:var(--mono);font-size:.8rem;text-decoration:none;
  transition:top .2s var(--ease);
}
.skip:focus{top:.75rem}

/* grão de filme — evita o acabamento liso de render */
.grain{
  position:fixed;inset:-50%;z-index:60;pointer-events:none;
  opacity:.05;mix-blend-mode:screen;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
}

.wrap{width:min(100%,86rem);margin-inline:auto;padding-inline:var(--gut)}

/* ─── topbar ───────────────────────────────────────────────────────── */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;gap:1rem;
  padding:1.1rem var(--gut);
  font-family:var(--mono);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;
}
/* véu superior: mantém a barra legível quando a tipografia gigante passa por baixo */
body::before{
  content:'';position:fixed;top:0;left:0;right:0;height:8rem;z-index:49;pointer-events:none;
  background:linear-gradient(180deg,rgba(11,10,9,.97) 0%,rgba(11,10,9,.9) 34%,rgba(11,10,9,.5) 66%,transparent 100%);
}
.mark{color:var(--bone);font-weight:500}
.mark-dim{opacity:.55}
.topbar-mid{flex:1;height:1px;background:var(--rule)}
.topbar-note{color:var(--ash)}

/* ─── HUD profundímetro ────────────────────────────────────────────── */
.hud{
  position:fixed;z-index:50;left:clamp(1.25rem,3.4vw,3rem);bottom:clamp(1.25rem,4vh,2.75rem);
  display:none;align-items:flex-end;gap:.9rem;
  font-family:var(--mono);
  opacity:0;transform:translateY(8px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
/* pad de leitura: o instrumento fica legível mesmo quando o conteúdo passa por baixo */
.hud::before{
  content:'';position:absolute;z-index:-1;
  left:calc(var(--gut) * -1);right:-5rem;top:-2.5rem;bottom:calc(-1 * clamp(1.25rem,4vh,2.75rem) - 1rem);
  background:radial-gradient(120% 100% at 0% 100%,rgba(11,10,9,.94) 0%,rgba(11,10,9,.72) 45%,transparent 72%);
  pointer-events:none;
}
@media (min-width:64rem){.hud{display:flex}}
.hud.on{opacity:1;transform:none}
.hud-rail{position:relative;width:1px;height:clamp(4.5rem,13vh,7.5rem);background:var(--rule)}
.hud-tick{position:absolute;left:-3px;width:7px;height:1px;background:var(--rule)}
.hud-tick[data-tick="0"]{top:0}
.hud-tick[data-tick="1"]{top:25%}
.hud-tick[data-tick="2"]{top:50%}
.hud-tick[data-tick="3"]{top:75%}
.hud-tick[data-tick="4"]{top:100%}
.hud-cursor{
  position:absolute;left:-4px;top:0;width:9px;height:9px;
  border:1px solid var(--amber);background:rgba(11,10,9,.6);
  transform:translateY(-50%) rotate(45deg);
  transition:top .18s linear;
}
.hud-read{display:flex;flex-direction:column;gap:.15rem;line-height:1.2}
.hud-depth{font-size:clamp(1.4rem,3.4vw,2rem);color:var(--amber);font-weight:500;font-variant-numeric:tabular-nums}
.hud-depth i{font-style:normal;font-size:.45em;opacity:.6;margin-left:.15em}
.hud-layer{font-size:.65rem;letter-spacing:.2em;text-transform:uppercase;color:var(--ash)}

/* ─── palco de scroll ──────────────────────────────────────────────── */
.act{position:relative;height:var(--act-scroll)}
.act--hero{height:calc(var(--act-scroll) + 30vh)}
@media (max-width:48rem){:root{--act-scroll:250vh}}
.stage{
  position:sticky;top:0;height:100svh;overflow:hidden;
  display:flex;align-items:center;
}
.still,.film{
  position:absolute;inset:0;width:100%;height:100%;
  object-fit:cover;
}
.film{opacity:0;transition:opacity .6s var(--ease)}
.stage.live .film{opacity:1}
.stage.live .still{opacity:0;transition:opacity .6s var(--ease)}

/* Os scrims não são decoração: são o que garante o contraste AA do texto sobre
   mídia em movimento. Densos onde o texto vive, abertos onde a imagem fala. */
.scrim{position:absolute;inset:0;pointer-events:none}
.scrim--hero{
  background:
    linear-gradient(96deg,rgba(11,10,9,.95) 0%,rgba(11,10,9,.88) 33%,rgba(11,10,9,.3) 60%,rgba(11,10,9,.42) 100%),
    linear-gradient(180deg,rgba(11,10,9,.88) 0%,rgba(11,10,9,.2) 42%,rgba(11,10,9,.86) 100%);
}
.scrim--left{background:linear-gradient(92deg,rgba(11,10,9,.96) 0%,rgba(11,10,9,.91) 44%,rgba(11,10,9,.5) 80%,rgba(11,10,9,.38) 100%)}
.scrim--full{background:linear-gradient(180deg,rgba(11,10,9,.92) 0%,rgba(11,10,9,.87) 38%,rgba(11,10,9,.93) 100%)}

.stage > .wrap,.stage > .footline{position:relative;z-index:2;width:100%}
/* palco fixo: reserva a faixa inferior onde o profundímetro mora */
.stage > .wrap{padding-block-end:clamp(3.5rem,11vh,6.5rem)}

/* atos de conteúdo denso: o plano de fundo fica fixo, o conteúdo corre por cima */
.act--flow{height:auto}
.act--flow > .stage{margin-bottom:-100svh}
.act--flow > .wrap{
  position:relative;z-index:2;
  padding-block:clamp(6rem,19vh,11rem) clamp(7rem,22vh,13rem);
  padding-left:calc(var(--gut) + var(--hud-lane));
}

/* ─── tipografia ───────────────────────────────────────────────────── */
.eyebrow{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.24em;
  text-transform:uppercase;color:var(--amber);margin-bottom:1.4rem;
}
.eyebrow .sep,.foot .sep{opacity:.4;margin-inline:.4em}

h1,h2{
  font-family:var(--display);font-weight:400;line-height:.92;
  letter-spacing:-.015em;text-wrap:balance;
}
h1{font-size:clamp(3.4rem,13vw,11.5rem)}
h2{font-size:clamp(2.5rem,7.4vw,6.4rem)}
h1 em,h2 em{font-style:italic;color:var(--amber)}

.lede{
  font-size:clamp(1.05rem,1.6vw,1.45rem);color:var(--bone);
  max-width:34ch;margin-top:1.8rem;line-height:1.45;
}
.body{max-width:46ch;margin-top:1.5rem;color:var(--bone)}
.body--wide{max-width:62ch}

.hint{
  margin-top:2.6rem;font-family:var(--mono);font-size:.7rem;
  letter-spacing:.2em;text-transform:uppercase;color:#C9C2B8;
  display:flex;align-items:center;gap:.7rem;
}
.hint-arrow{
  width:1px;height:2.2rem;background:linear-gradient(180deg,var(--amber),transparent);
  animation:drop 2.4s var(--ease) infinite;
}
@keyframes drop{0%,100%{transform:scaleY(.35);opacity:.4;transform-origin:top}50%{transform:scaleY(1);opacity:1;transform-origin:top}}

.hero-copy{padding-block:14vh 12vh}
/* o hero entra na carga da página, escalonado — quem chega no topo já lê */
.hero-copy .reveal{transition-duration:1s}
.hero-copy .eyebrow{transition-delay:.2s}
.hero-copy h1{transition-delay:.34s}
.hero-copy .lede{transition-delay:.62s}
.hero-copy .hint{transition-delay:.86s}

/* ─── revelações ───────────────────────────────────────────────────── */
.reveal{opacity:0;transform:translateY(1.6rem);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ─── camada 01 · cascata ──────────────────────────────────────────── */
.act-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(2.2rem,5vw,5rem);align-items:center}
@media (min-width:60rem){.act-grid{grid-template-columns:1.05fr .95fr}}

.gates{list-style:none;display:flex;flex-direction:column}
.gate{
  background:rgba(11,10,9,.92);padding:1.4rem clamp(1rem,2vw,1.8rem);
  display:grid;grid-template-columns:auto 1fr;gap:.35rem 1.2rem;align-items:baseline;
  border-left:2px solid transparent;border-top:1px solid var(--rule);
}
.gate:last-child{border-bottom:1px solid var(--rule)}
.gate.in{border-left-color:var(--amber)}
.gate-n{font-family:var(--mono);font-size:.72rem;color:var(--amber);letter-spacing:.1em}
.gate-name{font-family:var(--display);font-size:clamp(1.5rem,2.8vw,2.2rem);line-height:1}
.gate-txt{grid-column:2;font-size:.92rem;color:var(--ash);max-width:38ch}

.footline{
  position:absolute;right:0;bottom:clamp(1.25rem,5vh,3rem);
  padding-inline:var(--gut);text-align:right;margin-left:auto;
  text-shadow:0 0 14px rgba(11,10,9,.98),0 0 5px rgba(11,10,9,1);
  font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;
  color:var(--ash);max-width:56ch;
}

/* ─── camada 02 · conselho ─────────────────────────────────────────── */
.cards{list-style:none;display:grid;gap:1px;margin-top:clamp(2rem,4vh,3.2rem)}
@media (min-width:44rem){.cards{grid-template-columns:repeat(2,1fr)}}
@media (min-width:74rem){.cards{grid-template-columns:repeat(4,1fr)}}
.card{
  background:rgba(11,10,9,.9);padding:1.1rem 1.2rem 1.2rem;
  display:flex;flex-direction:column;gap:.5rem;
  border-top:1px solid var(--rule);
  box-shadow:1px 0 0 var(--rule);
}
.card-slug{font-family:var(--mono);font-size:.78rem;color:var(--amber);letter-spacing:-.01em}
.card-desc{font-size:.86rem;line-height:1.5;color:var(--bone)}
.card-meta{margin-top:auto;padding-top:.6rem;font-family:var(--mono);font-size:.66rem;letter-spacing:.08em;color:var(--ash)}
.card-meta i{font-style:normal;opacity:.4;margin-inline:.35em}

/* ─── camada 03 · forjas ───────────────────────────────────────────── */
.forges{display:grid;gap:clamp(1.6rem,3vw,2.6rem);margin-top:clamp(2rem,4vh,3rem)}
@media (min-width:52rem){.forges{grid-template-columns:repeat(2,1fr)}}
.forge h3{
  font-family:var(--mono);font-size:.7rem;font-weight:500;letter-spacing:.18em;
  text-transform:uppercase;color:var(--verdigris);
  padding-bottom:.6rem;border-bottom:1px solid var(--rule);margin-bottom:.9rem;
}
.forge ul{list-style:none;display:flex;flex-direction:column;gap:.55rem}
.forge li{font-size:.88rem;line-height:1.5;color:var(--ash);padding-left:1rem;position:relative}
.forge li::before{content:'';position:absolute;left:0;top:.62em;width:5px;height:1px;background:var(--amber)}
.forge b{color:var(--bone);font-family:var(--mono);font-size:.92em;font-weight:500}

/* ─── camada 04 · portão ───────────────────────────────────────────── */
.rubrics{list-style:none;display:flex;flex-direction:column}
.rubric{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:.3rem 1.2rem;
  padding:1.05rem clamp(.9rem,1.6vw,1.4rem);border-bottom:1px solid var(--rule);
  background:rgba(11,10,9,.9);
}
.rubric:first-child{border-top:1px solid var(--rule)}
.rubric-k{font-family:var(--display);font-size:clamp(1.35rem,2.4vw,1.9rem);line-height:1;min-width:8ch}
.rubric-v{font-family:var(--mono);font-size:.74rem;letter-spacing:.04em;color:var(--ash)}

/* ─── specs-prova ──────────────────────────────────────────────────── */
.specs{padding-block:clamp(6rem,16vh,12rem);border-top:1px solid var(--rule);background:var(--obsidian)}
.stats{
  display:grid;grid-template-columns:repeat(2,1fr);gap:1px;
  background:var(--rule);border:1px solid var(--rule);
  margin-top:clamp(2.5rem,6vh,4.5rem);
}
@media (min-width:56rem){.stats{grid-template-columns:repeat(4,1fr)}}
.stat{background:var(--obsidian);padding:clamp(1.4rem,3vw,2.2rem)}
.stat dt{font-family:var(--mono);font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;color:var(--ash)}
.stat dd{font-family:var(--display);font-size:clamp(3rem,7vw,5.5rem);line-height:1;color:var(--amber);margin-top:.4rem;font-variant-numeric:tabular-nums}

.proof{margin-top:clamp(3rem,8vh,6rem);display:grid;gap:clamp(1.5rem,4vw,3.5rem)}
@media (min-width:62rem){.proof{grid-template-columns:.85fr 1.15fr;align-items:start}}
.proof h3{font-family:var(--display);font-weight:400;font-size:clamp(1.7rem,3.4vw,2.6rem);line-height:1.05}
.proof-copy .body{margin-top:1.2rem}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0;
}
.log{
  background:var(--stone);border:1px solid var(--rule);border-left:2px solid var(--amber);
  padding:clamp(1.1rem,2.5vw,1.8rem);overflow-x:auto;
  font-family:var(--mono);font-size:.76rem;line-height:2;color:var(--ash);
}
.log b{color:var(--bone);font-weight:500}
.log .c{color:var(--verdigris)}

/* ─── CTA ──────────────────────────────────────────────────────────── */
.cta{padding-block:clamp(6rem,18vh,13rem);border-top:1px solid var(--rule);position:relative;overflow:hidden}
.cta::after{
  content:'';position:absolute;left:50%;top:-40%;width:120vmax;height:120vmax;
  transform:translateX(-50%);pointer-events:none;
  background:radial-gradient(circle,rgba(228,163,60,.13) 0%,transparent 58%);
}
.cta .wrap{position:relative;z-index:1}
.cmds{margin-top:clamp(2.5rem,6vh,4rem);display:flex;flex-direction:column;gap:1px;background:var(--rule);border-block:1px solid var(--rule)}
.cmd{
  background:var(--obsidian);padding:1.15rem clamp(1rem,2vw,1.6rem);
  display:flex;flex-wrap:wrap;align-items:baseline;gap:.5rem 1.2rem;
}
.cmd-n{font-family:var(--mono);font-size:.68rem;color:var(--amber);letter-spacing:.12em}
.cmd code{font-size:clamp(.95rem,1.9vw,1.25rem);color:var(--bone)}
.cmd-t{font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;color:var(--ash);margin-left:auto}

/* ─── rodapé ───────────────────────────────────────────────────────── */
.foot{padding-block:clamp(2.5rem,6vh,4rem);border-top:1px solid var(--rule)}
.foot-grid{display:flex;flex-wrap:wrap;gap:.8rem 2.5rem;justify-content:space-between;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.05em;color:var(--ash);line-height:1.8}
.foot b{color:var(--bone);font-weight:500}
.foot-tech{max-width:64ch}

/* ─── acessibilidade: movimento reduzido ───────────────────────────── */
@media (prefers-reduced-motion:reduce){
  .act,.act--hero{height:auto}
  .stage{position:relative;height:auto;min-height:0}
  .still{position:absolute;inset:0;height:100%}
  .film{display:none}
  .footline{position:static;margin-top:2rem;padding-inline:0}
  .reveal{opacity:1;transform:none;transition:none}
  .gate{border-left-color:var(--amber)}
  .hint-arrow{animation:none}
  .hud{display:none}
  .stage > .wrap{padding-block:clamp(3rem,8vh,6rem)}
  html{scroll-behavior:auto}
}