/* Página inicial (vitrine para novos alunos). Identidade do app (noite, marinho, dourado da logo, órbita,
   grade do quadro) levada a um "quadro vivo": cada movimento representa matemática ou física de verdade.
   Toda animação respeita prefers-reduced-motion e para quando sai da tela (classe .parado, via inicio.mjs). */

@font-face { font-family: "Mat-reto"; src: url("/katex/fonts/KaTeX_Main-Regular.woff2") format("woff2"); font-display: swap; }
/* fórmulas com a tipografia do KaTeX: letras em itálico de fórmula, números e sinais retos */
@font-face { font-family: "Mat"; src: url("/katex/fonts/KaTeX_Main-Regular.woff2") format("woff2"); font-display: swap; }
@font-face { font-family: "Mat"; src: url("/katex/fonts/KaTeX_Math-Italic.woff2") format("woff2"); unicode-range: U+0041-005A, U+0061-007A, U+0391-03A9, U+03B1-03C9; font-display: swap; }

@property --ang { syntax: "<angle>"; inherits: false; initial-value: 0deg; }

:root {
  color-scheme: dark;
  --abismo: #040B17;
  --noite: #071426;
  --marinho: #0B1F3A;
  --superficie: #0F2546;
  --elevado: #163458;
  --texto: #F3F6FC;
  --suave: #AFC1DB;
  --linha: #24436A;
  --ouro: #FFD34F;
  --ouro-claro: #FFE581;
  --dourado: linear-gradient(125deg, #FFE581 0%, #FFD34F 50%, #EDA91D 100%);
  --ciano: #7FE3FF;
  --rosa: #FF8FB1;
  --verde: #8EE0B6;
  --violeta: #B9A6FF;
  --tinta-no-ouro: #14233C;
  --grade: rgba(160, 190, 230, .05);
  --fonte-titulo: "Bahnschrift", "DIN Alternate", "Roboto Condensed", "sans-serif-condensed", "Segoe UI Variable Display", system-ui, sans-serif;
  --fonte-texto: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Roboto", sans-serif;
  --fonte-mat: "Mat", "Cambria Math", "Times New Roman", serif;
  --raio: 18px;
  --largura: 1180px;
  --lado: max(16px, calc((100vw - var(--largura)) / 2));
  font: 17px/1.6 var(--fonte-texto);
  -webkit-text-size-adjust: 100%;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--abismo); color: var(--texto); overflow-x: hidden;
  background-image:
    linear-gradient(var(--grade) 1px, transparent 1px), linear-gradient(90deg, var(--grade) 1px, transparent 1px),
    radial-gradient(1200px 700px at 85% -10%, rgba(40, 90, 170, .35), transparent 60%),
    radial-gradient(900px 600px at -10% 40%, rgba(255, 211, 79, .07), transparent 60%);
  background-size: 40px 40px, 40px 40px, auto, auto;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--ouro); }
h1, h2, h3 { font-family: var(--fonte-titulo); line-height: 1.08; margin: 0 0 .5em; letter-spacing: -.015em; }
h1 { font-size: clamp(2.5rem, 5.6vw, 4.5rem); }
h2 { font-size: clamp(1.8rem, 4.4vw, 3rem); max-width: 22ch; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
.mat { font-family: var(--fonte-mat); font-style: normal; letter-spacing: .01em; }
.mat .fn { font-family: "Mat-reto", var(--fonte-texto); } /* sen, cos, palavras: retas, como nos livros */
.ouro { background: var(--dourado); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sobre { display: inline-flex; align-items: center; gap: 10px; color: var(--ouro); font-weight: 700; text-transform: uppercase; letter-spacing: .1em; font-size: .8rem; margin-bottom: .9em; }
.sobre::before { content: ""; width: 26px; height: 2px; background: var(--dourado); border-radius: 2px; }
.heroi .sobre::before { display: none; }
.lead { font-size: 1.12rem; color: var(--suave); max-width: 60ch; }
.estreito { max-width: 68ch; }
.centro { text-align: center; margin-left: auto; margin-right: auto; justify-content: center; }
.pequeno { font-size: .86rem; color: var(--suave); }
.nota { font-size: .95rem; color: var(--suave); margin-top: 1.2rem; }

/* barra de leitura: uma reta de 0 a 1 que cresce com a rolagem */
.progresso-leitura { position: fixed; inset: 0 0 auto; height: 3px; z-index: 40; pointer-events: none; }
.progresso-leitura span { display: block; height: 100%; background: var(--dourado); transform-origin: 0 50%; transform: scaleX(0); box-shadow: 0 0 12px rgba(255, 211, 79, .7); }

/* luz que acompanha o mouse sobre a grade */
.holofote { position: fixed; inset: 0; pointer-events: none; z-index: 0; opacity: 0; transition: opacity .4s;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 30%), rgba(127, 227, 255, .07), transparent 70%); }
body.com-mouse .holofote { opacity: 1; }
main, .topo, .rodape { position: relative; z-index: 1; }

/* botões */
.btn {
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 12px 22px;
  border-radius: 999px; font-weight: 700; text-decoration: none; font-size: 1rem; line-height: 1.2; text-align: center; isolation: isolate;
  transition: transform .2s cubic-bezier(.2, .9, .3, 1.4), box-shadow .2s ease, border-color .2s ease;
}
.btn-ouro { background: var(--dourado); color: var(--tinta-no-ouro); box-shadow: 0 12px 34px -12px rgba(255, 211, 79, .75); overflow: hidden; }
.btn-ouro:hover { transform: translateY(-3px) scale(1.02); box-shadow: 0 18px 40px -12px rgba(255, 211, 79, .9); }
.btn-ouro:active { transform: translateY(0) scale(.98); }
.btn-brilho::after { /* reflexo que passa pelo botão de tempos em tempos */
  content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(105deg, transparent 35%, rgba(255, 255, 255, .65) 50%, transparent 65%);
  transform: translateX(-120%); animation: reflexo 4.5s ease-in-out infinite; }
@keyframes reflexo { 0%, 60% { transform: translateX(-120%); } 85%, 100% { transform: translateX(120%); } }
.btn .seta { transition: transform .2s; }
.btn:hover .seta { transform: translateX(4px); }
.btn-linha { color: var(--texto); border: 2px solid var(--linha); background: rgba(15, 37, 70, .7); }
.btn-linha:hover { border-color: var(--ouro); transform: translateY(-2px); }
.btn-grande { min-height: 58px; padding: 16px 32px; font-size: 1.08rem; }
.btn:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible { outline: 3px solid var(--ouro); outline-offset: 3px; }
.acoes, .cta-linha { display: flex; flex-wrap: wrap; gap: 12px; }
.cta-linha { justify-content: center; margin-top: 2.6rem; }

/* topo */
.topo {
  position: sticky; top: 0; z-index: 30; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px var(--lado); background: rgba(4, 11, 23, .985); border-bottom: 1px solid var(--linha);
}
.marca { display: flex; align-items: center; gap: 10px; color: var(--texto); text-decoration: none; min-height: 44px; min-width: 44px; }
.marca img { transition: transform .6s cubic-bezier(.2, .9, .3, 1.3); }
.marca:hover img { transform: rotate(-20deg) scale(1.08); }
.marca span { display: flex; flex-direction: column; line-height: 1.15; }
.marca small { color: var(--suave); font-size: .78rem; }
.topo-acoes { display: flex; gap: 8px; }
.topo-acoes .btn { min-height: 44px; padding: 8px 16px; font-size: .92rem; }

main > section, .numeros { padding-left: var(--lado); padding-right: var(--lado); }

/* ---------- 1. abertura ---------- */
.heroi { position: relative; display: grid; grid-template-columns: 1fr 1.02fr; gap: 48px; align-items: center; padding-top: 70px; padding-bottom: 56px; min-height: min(92vh, 860px); }
.heroi-texto, .quadro { position: relative; z-index: 2; }
.heroi h1 .linha { display: block; }
.heroi h1 .linha { animation: sobe .9s cubic-bezier(.2, .8, .2, 1) both; }
.heroi h1 .linha + .linha { animation-delay: .18s; }
.heroi .lead { animation: sobe .9s .32s cubic-bezier(.2, .8, .2, 1) both; }
.heroi .acoes { animation: sobe .9s .44s cubic-bezier(.2, .8, .2, 1) both; }
@keyframes sobe { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: none; } }
.ponto-vivo { flex: none; width: 9px; height: 9px; border-radius: 50%; background: var(--verde); box-shadow: 0 0 0 0 rgba(142, 224, 182, .7); animation: pulso 2s infinite; }
@keyframes pulso { 0% { box-shadow: 0 0 0 0 rgba(142, 224, 182, .6); } 80%, 100% { box-shadow: 0 0 0 12px rgba(142, 224, 182, 0); } }

.formulas-soltas { position: absolute; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.formulas-soltas span {
  position: absolute; left: var(--x); top: var(--y); font-size: clamp(1rem, 1.8vw, 1.5rem); color: rgba(175, 193, 219, .16); white-space: nowrap;
  transform: rotate(var(--r)) translate(calc(var(--px, 0) * 1px), calc(var(--py, 0) * 1px));
  animation: deriva var(--d) ease-in-out infinite alternate;
}
@keyframes deriva { from { translate: 0 0; } to { translate: 18px -26px; } }

/* o quadro vivo */
.quadro {
  margin: 0; border-radius: 24px; padding: 16px 16px 12px; background: linear-gradient(160deg, rgba(22, 52, 88, .92), rgba(8, 22, 44, .95));
  border: 1px solid rgba(127, 227, 255, .18); box-shadow: 0 40px 80px -40px rgba(0, 0, 0, .9), inset 0 1px 0 rgba(255, 255, 255, .06);
  animation: sobe 1s .25s cubic-bezier(.2, .8, .2, 1) both;
}
.quadro::before { /* borda que gira devagar, como a órbita da logo */
  content: ""; position: absolute; inset: -1px; border-radius: inherit; padding: 1px; pointer-events: none;
  background: conic-gradient(from var(--ang), transparent 0 70%, rgba(255, 211, 79, .9) 80%, rgba(127, 227, 255, .8) 88%, transparent 96%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude;
  animation: gira-borda 7s linear infinite;
}
@keyframes gira-borda { to { --ang: 360deg; } }
.quadro-topo { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 4px 6px 10px; flex-wrap: wrap; }
.chip { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; font-weight: 700; color: var(--abismo); background: var(--ciano); padding: 4px 10px; border-radius: 999px; transition: background .4s; }
.quadro-eq { font-size: clamp(1.25rem, 2.6vw, 1.7rem); color: var(--texto); transition: opacity .35s, transform .35s; }
.quadro-eq.troca { opacity: 0; transform: translateY(-8px); }
.quadro-svg { width: 100%; height: auto; display: block; border-radius: 14px; background: rgba(4, 11, 23, .55); touch-action: pan-y; cursor: crosshair; }
.grade line { stroke: rgba(160, 190, 230, .09); stroke-width: 1; }
.grade text { fill: rgba(175, 193, 219, .45); font: 11px var(--fonte-texto); }
.eixos line { stroke: rgba(175, 193, 219, .45); stroke-width: 1.5; }
.curva { fill: none; stroke: url(#g-curva); stroke-width: 4.5; stroke-linecap: round; stroke-linejoin: round; }
.curva-sombra { fill: none; stroke: rgba(255, 211, 79, .18); stroke-width: 14; stroke-linecap: round; }
.tangente { stroke: var(--rosa); stroke-width: 2; stroke-dasharray: 7 6; opacity: .9; }
.guia { stroke: rgba(255, 229, 129, .45); stroke-width: 1.2; stroke-dasharray: 3 5; }
.ponto { fill: var(--ouro-claro); stroke: var(--abismo); stroke-width: 2.5; }
.coord { fill: var(--texto); font-size: 17px; paint-order: stroke; stroke: rgba(4, 11, 23, .85); stroke-width: 5px; }
.quadro-rodape { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; color: var(--suave); font-size: .85rem; padding: 10px 6px 2px; }
.dica-mouse::before { content: "☝ "; }

/* faixa de fórmulas (duas cópias iguais: anda metade e recomeça sem salto) */
.faixa-formulas { overflow: hidden; border-block: 1px solid var(--linha); background: rgba(11, 31, 58, .55); padding: 14px 0; position: relative; z-index: 1;
  -webkit-mask: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.trilho { display: flex; gap: 56px; width: max-content; animation: trilho 60s linear infinite; }
.trilho span { font-size: 1.3rem; color: var(--suave); white-space: nowrap; }
.trilho span:nth-child(3n+1) { color: var(--ouro-claro); }
@keyframes trilho { to { transform: translateX(-50%); } }

.numeros { list-style: none; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; padding-top: 34px; padding-bottom: 10px; }
.numeros li { background: linear-gradient(160deg, var(--superficie), rgba(11, 31, 58, .6)); border: 1px solid var(--linha); border-radius: var(--raio); padding: 20px; }
.numeros b { display: block; font-family: var(--fonte-titulo); font-size: 2rem; line-height: 1.1; margin-bottom: 4px; background: var(--dourado); -webkit-background-clip: text; background-clip: text; color: transparent; }
.numeros b i { font-style: normal; }
.numeros li > span { color: var(--suave); font-size: .95rem; }

/* ---------- blocos ---------- */
.bloco { padding-top: 96px; padding-bottom: 96px; position: relative; }
.faixa { background: linear-gradient(180deg, rgba(11, 31, 58, .8), rgba(7, 20, 38, .6)); border-block: 1px solid var(--linha); }

/* 2. passos ligados por uma curva que se desenha */
.passos-caminho { position: relative; margin-top: 2.4rem; }
.caminho { position: absolute; left: 0; right: 0; top: -6px; width: 100%; height: 120px; pointer-events: none; }
.caminho path { fill: none; stroke: var(--ouro); stroke-width: 2.5; stroke-dasharray: 1; stroke-dashoffset: 1; opacity: .7; transition: stroke-dashoffset 2.2s cubic-bezier(.6, .1, .2, 1); vector-effect: non-scaling-stroke; }
.visto .caminho path, .passos-caminho.visto .caminho path { stroke-dashoffset: 0; }
.passos { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; position: relative; padding-top: 70px; }
.passos li { background: linear-gradient(170deg, var(--superficie), rgba(11, 31, 58, .7)); border: 1px solid var(--linha); border-radius: var(--raio); padding: 24px; transition: transform .3s, border-color .3s; }
.passos li:hover { transform: translateY(-6px); border-color: rgba(255, 211, 79, .6); }
.passos .num { display: inline-grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; background: var(--dourado); color: var(--tinta-no-ouro); font: 800 1.3rem var(--fonte-titulo); margin-bottom: 14px; box-shadow: 0 0 0 6px rgba(255, 211, 79, .12); }
.passos p, .cartoes p { color: var(--suave); margin: 0; }

/* 3. galeria com cartões que se inclinam e borda que gira */
.galeria { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 2.2rem; perspective: 1200px; }
.cartao-vivo {
  position: relative; margin: 0; background: var(--superficie); border: 1px solid var(--linha); border-radius: var(--raio); overflow: hidden;
  transform: rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)); transition: transform .25s ease-out, box-shadow .3s; will-change: transform;
}
.cartao-vivo:hover { box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .9), 0 0 0 1px rgba(255, 211, 79, .45); }
.cartao-vivo img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; object-position: top; transition: transform .6s cubic-bezier(.2, .8, .2, 1); }
.cartao-vivo:hover img { transform: scale(1.05); }
.cartao-vivo::after { content: ""; position: absolute; inset: 0; pointer-events: none; opacity: 0; transition: opacity .3s;
  background: radial-gradient(300px circle at var(--cx, 50%) var(--cy, 50%), rgba(255, 229, 129, .14), transparent 60%); }
.cartao-vivo:hover::after { opacity: 1; }
.cartao-vivo figcaption { padding: 16px 18px 20px; color: var(--suave); font-size: .95rem; }
.cartao-vivo figcaption b { display: block; color: var(--texto); font-family: var(--fonte-titulo); font-size: 1.15rem; margin-bottom: 4px; }

/* 4. laboratório de lançamento */
.lab { display: grid; grid-template-columns: 1.6fr 1fr; gap: 22px; margin-top: 2rem; align-items: stretch; }
.lab-svg { width: 100%; height: auto; background: linear-gradient(180deg, rgba(15, 37, 70, .7), rgba(4, 11, 23, .8)); border: 1px solid var(--linha); border-radius: var(--raio); display: block; }
.chao { stroke: rgba(175, 193, 219, .6); stroke-width: 2; }
.previsto { fill: none; stroke: rgba(127, 227, 255, .35); stroke-width: 2; stroke-dasharray: 4 7; }
.rastro { fill: none; stroke: var(--ouro); stroke-width: 3.5; stroke-linecap: round; }
#lab-marcas circle { fill: rgba(255, 229, 129, .55); }
.canhao rect { fill: var(--elevado); stroke: var(--ciano); stroke-width: 2; }
.bola { fill: var(--ouro-claro); stroke: var(--abismo); stroke-width: 2; }
.vetor { stroke-width: 3.5; stroke-linecap: round; }
.vx { stroke: var(--ouro); marker-end: none; }
.vy { stroke: var(--ciano); }
.rotulo-alcance { fill: var(--ouro-claro); font-size: 16px; text-anchor: middle; }
.lab-painel { background: linear-gradient(170deg, var(--superficie), rgba(11, 31, 58, .7)); border: 1px solid var(--linha); border-radius: var(--raio); padding: 24px; display: flex; flex-direction: column; gap: 12px; }
.controle { display: grid; gap: 10px; font-weight: 700; }
.controle b { color: var(--ouro); font-size: 1.4rem; font-family: var(--fonte-titulo); }
.controle input { width: 100%; min-height: 44px; accent-color: var(--ouro); }
.lab-eq { font-size: 1.35rem; margin: 6px 0 0; color: var(--ouro-claro); }
.lab-saida { font-size: 1.1rem; margin: 0; }

/* 5. demonstração: o quadrado de 3 + 4 */
.demo { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center; max-width: 920px; margin: 2.2rem auto 1.6rem; }
.demo-lado { background: linear-gradient(170deg, var(--superficie), rgba(11, 31, 58, .7)); border: 1px solid var(--linha); border-radius: var(--raio); padding: 28px; }
.demo-pergunta { font-size: 2.4rem; text-align: center; margin-bottom: .6em; }
.demo-opcoes { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.demo-opcoes button {
  min-width: 96px; min-height: 60px; border-radius: 14px; border: 2px solid var(--linha); background: var(--elevado); color: var(--texto);
  font: 700 1.4rem var(--fonte-titulo); cursor: pointer; transition: transform .2s cubic-bezier(.2, .9, .3, 1.4), border-color .2s, background .2s;
}
.demo-opcoes button:hover { border-color: var(--ouro); transform: translateY(-3px); }
.demo-opcoes button[data-estado="certo"] { border-color: var(--verde); background: rgba(142, 224, 182, .16); animation: pula .5s; }
.demo-opcoes button[data-estado="quase"] { border-color: var(--rosa); background: rgba(255, 143, 177, .12); animation: treme .45s; }
@keyframes pula { 40% { transform: translateY(-8px) scale(1.06); } }
@keyframes treme { 20%, 60% { transform: translateX(-6px); } 40%, 80% { transform: translateX(6px); } }
.demo-devolutiva { margin: 20px 0 0; padding: 14px 16px; border-radius: 12px; background: var(--marinho); color: var(--suave); min-height: 3.2em; }
.demo-devolutiva[data-estado="certo"] { color: var(--verde); }
.demo-devolutiva[data-estado="quase"] { color: var(--rosa); }
.demo-figura { width: 100%; max-width: 380px; margin: 0 auto; display: block; overflow: visible; }
.dg-fundo { fill: rgba(4, 11, 23, .6); stroke: rgba(175, 193, 219, .5); stroke-width: 2; }
.dg-grade line { stroke: rgba(175, 193, 219, .13); }
.dg { opacity: 0; transform-box: fill-box; transform-origin: center; transform: scale(.6); transition: opacity .5s, transform .6s cubic-bezier(.2, .9, .3, 1.3), fill .4s; stroke: var(--abismo); stroke-width: 3; }
.dg-q9 { fill: rgba(185, 166, 255, .75); }
.dg-q16 { fill: rgba(127, 227, 255, .6); }
.dg-r12a, .dg-r12b { fill: rgba(255, 211, 79, .7); }
.dg-tira { fill: rgba(255, 143, 177, .55); }
.dg-t, .dg-total, .dg-lado { text-anchor: middle; fill: var(--texto); font-size: 18px; opacity: 0; transition: opacity .5s .35s; paint-order: stroke; stroke: rgba(4, 11, 23, .55); stroke-width: 2.5px; }
.dg-lado { font-size: 16px; fill: var(--suave); }
.dg-total { font-size: 30px; opacity: 1; transition: opacity .3s; }
.demo-figura:not(.r-0) .dg-total { opacity: 0; }
.r-49 .dg-q9, .r-49 .dg-q16, .r-49 .dg-r12a, .r-49 .dg-r12b,
.r-25 .dg-q9, .r-25 .dg-q16 { opacity: 1; transform: none; }
.r-49 .dg-r12a { transition-delay: .25s; } .r-49 .dg-r12b { transition-delay: .4s; } .r-49 .dg-q16 { transition-delay: .12s; }
.r-25 .dg-r12a, .r-25 .dg-r12b { opacity: 1; transform: none; fill: transparent; stroke: var(--rosa); stroke-width: 3; stroke-dasharray: 8 7; animation: falta 1.2s ease-in-out infinite; }
@keyframes falta { 50% { fill: rgba(255, 143, 177, .18); } }
.r-14 .dg-tira { opacity: 1; transform: none; }
.r-49 .dg-t:not(.t-tira), .r-25 .t-q9, .r-25 .t-q16, .r-25 .t-r12a, .r-25 .t-r12b, .r-14 .t-tira, .r-49 .dg-lado, .r-25 .dg-lado { opacity: 1; }
.r-25 .t-r12a, .r-25 .t-r12b { fill: var(--rosa); }

/* 6. cartões da plataforma com ícones que se mexem */
.cartoes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 2.2rem; }
.cartoes article { position: relative; background: linear-gradient(170deg, var(--superficie), rgba(11, 31, 58, .7)); border: 1px solid var(--linha); border-radius: var(--raio); padding: 24px; transition: transform .3s, border-color .3s; overflow: hidden; }
.cartoes article:hover { transform: translateY(-6px); border-color: rgba(255, 211, 79, .55); }
.cartoes svg { width: 48px; height: 48px; margin-bottom: 12px; display: block; }
.ic { fill: none; stroke: var(--ouro); stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
.ic-pt { fill: var(--ciano); }
.ic-traco { stroke-dasharray: 60; stroke-dashoffset: 60; animation: traca 3s ease-in-out infinite; }
@keyframes traca { 0% { stroke-dashoffset: 60; } 45%, 80% { stroke-dashoffset: 0; } 100% { stroke-dashoffset: -60; } }
.ic-anel { stroke: var(--ciano); stroke-dasharray: 1; stroke-dashoffset: 1; transform: rotate(-90deg); transform-origin: 24px 24px; animation: anel 4s ease-in-out infinite; }
@keyframes anel { 0% { stroke-dashoffset: 1; } 60%, 85% { stroke-dashoffset: .12; } 100% { stroke-dashoffset: 1; } }
.ic-giro { transform-origin: 24px 24px; animation: gira 3.5s cubic-bezier(.6, 0, .3, 1) infinite; }
@keyframes gira { to { transform: rotate(-360deg); } }
.ic-sino { transform-origin: 24px 8px; animation: balanca 3s ease-in-out infinite; }
@keyframes balanca { 0%, 60%, 100% { transform: rotate(0); } 68% { transform: rotate(14deg); } 76% { transform: rotate(-12deg); } 84% { transform: rotate(7deg); } 92% { transform: rotate(-4deg); } }
.ic-linhas { stroke-dasharray: 16; animation: escreve 3s linear infinite; }
@keyframes escreve { from { stroke-dashoffset: 32; } to { stroke-dashoffset: 0; } }
.ic-barra { transform-box: fill-box; transform-origin: bottom; animation: cresce 3s ease-in-out infinite; }
.b2 { animation-delay: .2s; } .b3 { animation-delay: .4s; }
@keyframes cresce { 0%, 100% { transform: scaleY(.35); } 50% { transform: scaleY(1); } }
.ic-pulso { animation: pisca 1.6s ease-in-out infinite; }
@keyframes pisca { 50% { opacity: .2; } }

/* 7. unidades com glifos animados (cada um mostra a ideia da unidade) */
.conteudos { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 2.2rem 0 1.8rem; }
.unidade { background: linear-gradient(170deg, var(--superficie), rgba(11, 31, 58, .7)); border: 1px solid var(--linha); border-radius: var(--raio); padding: 22px; transition: transform .3s, border-color .3s; }
.unidade:hover { transform: translateY(-5px); border-color: rgba(127, 227, 255, .5); }
.unidade h3 { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; font-size: 1.3rem; }
.unidade h3 small { color: var(--suave); font: 400 .85rem var(--fonte-texto); }
.unidade ul { margin: 0; padding-left: 1.1em; color: var(--suave); }
.unidade li { margin: 5px 0; }
.unidade li::marker { color: var(--ouro); }
.glifo { width: 64px; height: 64px; margin-bottom: 8px; overflow: visible; }
.gl-base { fill: rgba(175, 193, 219, .14); }
.gl-fra { fill: var(--ouro); transform-box: fill-box; transform-origin: left; animation: fracao 3.6s ease-in-out infinite; }
.f2 { fill: var(--ciano); animation-delay: .3s; } .f3 { fill: var(--rosa); animation-delay: .6s; }
@keyframes fracao { 0%, 100% { transform: scaleX(.2); } 45%, 70% { transform: scaleX(1); } }
.gl-linha { fill: none; stroke: var(--ouro); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.gl-braco { transform-origin: 32px 18px; animation: equilibra 4s ease-in-out infinite; }
@keyframes equilibra { 0% { transform: rotate(-9deg); } 30% { transform: rotate(6deg); } 55% { transform: rotate(-3deg); } 75%, 100% { transform: rotate(0); } }
.gl-eixo { fill: none; stroke: rgba(175, 193, 219, .5); stroke-width: 2; }
.gl-curva { fill: none; stroke: var(--ciano); stroke-width: 3.5; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; animation: desenha 3.2s ease-in-out infinite; }
@keyframes desenha { 0% { stroke-dashoffset: 1; } 55%, 85% { stroke-dashoffset: 0; } 100% { stroke-dashoffset: -1; } }
.gl-gira { transform-origin: 32px 38px; animation: gira-tri 8s linear infinite; }
@keyframes gira-tri { to { transform: rotate(360deg); } }
.gl-arco { fill: none; stroke: var(--rosa); stroke-width: 2.5; }
.gl-roda { transform-origin: 32px 32px; animation: gira-tri 5s linear infinite; }
.gl-raio { stroke: var(--rosa); stroke-width: 2.5; }
.gl-ponto { fill: var(--ouro); }
.gl-traj { fill: none; stroke: rgba(255, 211, 79, .4); stroke-width: 2; stroke-dasharray: 3 4; }
.gl-bola { fill: var(--ouro); offset-path: path("M8 56 Q 32 -2, 56 56"); animation: voa 2.4s cubic-bezier(.45, 0, .55, 1) infinite; }
@keyframes voa { from { offset-distance: 0%; } to { offset-distance: 100%; } }

/* 8. frases como bilhetes presos no quadro */
.frases { list-style: none; padding: 0; margin: 2.4rem 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.frases li {
  position: relative; background: linear-gradient(170deg, #FFF3C4, #FFE38A); color: #2A2410; border-radius: 6px; padding: 26px 20px 20px; font: italic 1.1rem/1.45 var(--fonte-texto);
  transform: rotate(var(--g)); box-shadow: 0 18px 30px -18px rgba(0, 0, 0, .8); transition: transform .3s cubic-bezier(.2, .9, .3, 1.4);
}
.frases li::before { content: ""; position: absolute; top: -9px; left: 50%; width: 64px; height: 20px; translate: -50% 0; background: rgba(127, 227, 255, .45); border-radius: 3px; }
.frases li:hover { transform: rotate(0) scale(1.04); }

/* 9. perguntas */
.faq { max-width: 820px; display: grid; gap: 12px; margin-top: 1.5rem; }
.faq details { background: var(--superficie); border: 1px solid var(--linha); border-radius: 14px; padding: 4px 18px; transition: border-color .3s; }
.faq details[open] { border-color: rgba(255, 211, 79, .5); }
.faq summary { cursor: pointer; font-family: var(--fonte-titulo); font-size: 1.15rem; font-weight: 700; min-height: 52px; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 8px 0; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 1.6rem var(--fonte-mat); color: var(--ouro); transition: transform .3s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { color: var(--suave); margin: 0 0 14px; }

/* 10. final com órbitas */
.final { position: relative; text-align: center; padding-top: 120px; padding-bottom: 140px; overflow: hidden; }
.final > *:not(.orbitas) { position: relative; z-index: 1; }
.orbitas { position: absolute; left: 50%; top: 50%; width: min(1100px, 150vw); translate: -50% -50%; pointer-events: none; }
.orb ellipse { fill: none; stroke: rgba(255, 211, 79, .22); stroke-width: 1.5; }
.orb circle { fill: var(--ouro); }
.orb { transform-origin: 400px 200px; }
.orb1 { animation: gira-tri 26s linear infinite; }
.orb2 { animation: gira-tri 34s linear infinite reverse; }
.orb2 ellipse { stroke: rgba(127, 227, 255, .2); } .orb2 circle { fill: var(--ciano); }
.orb3 { animation: gira-tri 20s linear infinite; }
.orb3 ellipse { stroke: rgba(255, 143, 177, .2); } .orb3 circle { fill: var(--rosa); }
.final h2 { margin-left: auto; margin-right: auto; font-size: clamp(2.2rem, 6vw, 4rem); max-width: none; }
.final p { color: var(--suave); font-size: 1.15rem; }

.rodape { border-top: 1px solid var(--linha); padding: 28px 16px 100px; text-align: center; color: var(--suave); font-size: .95rem; background: var(--abismo); }
.rodape a { display: inline-block; padding: 10px 4px; }

.barra-cta {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; display: flex; gap: 10px; justify-content: center;
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); background: rgba(4, 11, 23, .97); border-top: 1px solid var(--linha);
}
.barra-cta .btn-ouro { flex: 1 1 auto; max-width: 340px; }
@media (min-width: 601px) { .barra-cta { display: none !important; } }

/* aparecer ao rolar */
.surge { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s cubic-bezier(.2, .8, .2, 1); }
.surge.visto { opacity: 1; transform: none; }

/* fora da tela, as animações param (economia de bateria) */
.parado, .parado * { animation-play-state: paused !important; }

/* tablet */
@media (max-width: 980px) {
  .heroi { grid-template-columns: 1fr; padding-top: 44px; min-height: 0; }
  .passos, .cartoes, .numeros { grid-template-columns: repeat(2, 1fr); }
  .galeria, .conteudos, .frases { grid-template-columns: repeat(2, 1fr); }
  .lab, .demo { grid-template-columns: 1fr; }
  .caminho { display: none; }
  .passos { padding-top: 0; }
}
/* celular */
@media (max-width: 600px) {
  :root { font-size: 16px; }
  .topo { padding-top: 8px; padding-bottom: 8px; }
  .marca span, .so-largo { display: none; }
  .marca img { width: 36px; height: 36px; }
  .topo-acoes .btn { padding: 8px 14px; }
  .bloco { padding-top: 64px; padding-bottom: 64px; }
  .passos, .cartoes, .galeria, .conteudos, .frases { grid-template-columns: 1fr; }
  .numeros { grid-template-columns: 1fr 1fr; gap: 10px; }
  .numeros li { padding: 14px; }
  .numeros b { font-size: 1.35rem; }
  .acoes .btn, .cta-linha .btn { width: 100%; }
  .quadro { padding: 10px 10px 8px; border-radius: 18px; }
  .formulas-soltas span:nth-child(n+5) { display: none; }
  .demo-pergunta { font-size: 2rem; }
  .demo-lado { padding: 20px; }
  .frases li { transform: rotate(calc(var(--g) / 2)); }
}

/* menos movimento: tudo parado, com o estado final visível */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .surge { opacity: 1; transform: none; }
  .caminho path { stroke-dashoffset: 0; }
  .gl-curva, .ic-traco, .ic-anel { stroke-dashoffset: 0; }
  .gl-fra { transform: none; }
  .gl-bola { offset-distance: 50%; }
  .cartao-vivo { transform: none; }
}