/* ==========================================================================
   Inteligência operacional com apoio de IA · Matheus Meira
   Protótipo estático. Tokens reproduzidos do CSS público de matheusmeira.com
   (consultado em 11/11/2026); não depende de arquivos de build do site.
   ========================================================================== */

/* ---------- Fontes locais (mesmos arquivos servidos pelo site, licença OFL) */
@font-face {
  font-family: "Manrope";
  src: url("../fonts/manrope-var.woff2") format("woff2");
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Source Serif 4";
  src: url("../fonts/source-serif-4-var.woff2") format("woff2");
  font-weight: 200 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/ibm-plex-mono-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/ibm-plex-mono-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* ---------- Tokens */
:root {
  --ink: #111417;
  --paper: #f2efe7;
  --petroleum: #214c4a;
  --mango: #f28a2e;
  --card: #fcfbf7;
  --muted: #e6e5df;
  --muted-ink: #555e62;      /* texto secundário sobre paper: 5,9:1 */
  --line: rgba(17, 20, 23, 0.16);
  --line-strong: rgba(17, 20, 23, 0.28);
  --on-ink: rgba(242, 239, 231, 0.86);
  --on-ink-soft: rgba(242, 239, 231, 0.68);
  --line-on-ink: rgba(242, 239, 231, 0.2);

  --font-sans: "Manrope", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Georgia, "Times New Roman", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --radius: 2px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-y: clamp(4.5rem, 9vw, 8.5rem);
  --header-h: 4.5rem;
  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- Base */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-weight: 450;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

h1, h2, h3, p, ol, ul, dl, dd, figure { margin: 0; }
ol, ul { padding: 0; list-style: none; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
[hidden] { display: none !important; }

::selection { background: var(--petroleum); color: var(--paper); }

:focus-visible {
  outline: 2px solid var(--petroleum);
  outline-offset: 3px;
}
main:focus { outline: none; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem; top: 0.75rem;
  z-index: 100;
  padding: 0.85rem 1.1rem;
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; outline-color: var(--mango); }

.wrap {
  width: 100%;
  max-width: 90rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- Tipografia compartilhada */
.label,
.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted-ink);
}
.label__num { color: var(--ink); }
.label__rule { flex: none; width: 2.5rem; height: 1px; background: var(--line-strong); }
.eyebrow__dot { flex: none; width: 0.5rem; height: 0.5rem; background: var(--mango); }

.h2 {
  font-family: var(--font-serif);
  font-size: clamp(2.125rem, 1.35rem + 3.1vw, 4rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.045em;
  text-wrap: balance;
  max-width: 18ch;
}
.h2--xl {
  font-size: clamp(2.375rem, 1.3rem + 4.3vw, 5.25rem);
  line-height: 0.95;
  letter-spacing: -0.055em;
  max-width: 14ch;
}

.lead {
  font-size: clamp(1.125rem, 1.05rem + 0.35vw, 1.3125rem);
  line-height: 1.55;
  text-wrap: pretty;
}
.lead--narrow { max-width: 38rem; margin-top: 1.75rem; color: var(--muted-ink); }
.muted { color: var(--muted-ink); }

/* ---------- Botões */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-height: 3.5rem;
  padding: 0.75rem 1.75rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 650;
  line-height: 1.25;
  letter-spacing: -0.005em;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 180ms var(--ease-out), border-color 180ms var(--ease-out), color 180ms var(--ease-out), transform 140ms var(--ease-out);
}
.btn:hover { background: var(--petroleum); border-color: var(--petroleum); }
.btn:active { transform: scale(0.975); transition-duration: 60ms; }
.btn .icon { flex: none; transition: transform 220ms var(--ease-out); }
.btn:hover .icon { transform: translate(2px, -2px); }
.btn--ghost:hover .icon { transform: translateY(2px); }

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn--ghost:hover { background: transparent; border-color: var(--ink); }

.btn--small {
  min-height: 2.75rem;
  padding: 0.5rem 1.15rem;
  font-size: 0.875rem;
}

.btn--mango {
  background: var(--mango);
  border-color: var(--mango);
  color: var(--ink);
}
.btn--mango:hover { background: var(--paper); border-color: var(--paper); color: var(--ink); }
.btn--mango:focus-visible { outline-color: var(--paper); }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 2.75rem;
  font-weight: 650;
  font-size: 0.9375rem;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.3em;
  text-decoration-color: var(--line-strong);
  transition: text-decoration-color 180ms var(--ease-out);
}
.text-link:hover { text-decoration-color: var(--ink); }
.text-link .icon { flex: none; transition: transform 220ms var(--ease-out); }
.text-link:hover .icon { transform: translateX(3px); }

/* ---------- Cabeçalho: camada translúcida, conteúdo rola por baixo */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(242, 239, 231, 0.84);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 2.75rem;
  text-decoration: none;
}
.brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 2.5rem; height: 2.5rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-indent: 0.12em;
}
.brand__name { font-size: 0.875rem; font-weight: 650; letter-spacing: -0.02em; white-space: nowrap; }

.site-nav { display: none; align-items: center; gap: 0.25rem; }
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding-inline: 0.8rem;
  font-size: 0.6875rem;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted-ink);
  transition: color 160ms var(--ease-out);
}
.site-nav a:hover { color: var(--ink); }

@media (min-width: 60rem) {
  .site-nav { display: flex; }
}
/* Janelas muito baixas (ou zoom alto): o cabeçalho deixa de ocupar a tela */
@media (max-height: 30rem) {
  .site-header { position: static; }
  html { scroll-padding-top: 1rem; }
}

/* ---------- Abertura */
.hero { padding-block: clamp(2.5rem, 6vw, 5.5rem) clamp(4rem, 8vw, 7rem); }
.hero__grid { display: grid; gap: 3rem; }
.hero__title {
  margin-top: 1.75rem;
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 1.2rem + 5.2vw, 5.5rem);
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: -0.055em;
  text-wrap: balance;
}
.hero__title span { display: block; }
.hero__title-accent { margin-top: 0.14em; color: var(--petroleum); }
.hero__lead {
  margin-top: 2rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line-strong);
  max-width: 37rem;
  font-size: clamp(1.0625rem, 1rem + 0.35vw, 1.25rem);
  line-height: 1.6;
  text-wrap: pretty;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2.25rem; }
.hero__note { margin-top: 1.1rem; font-size: 0.8125rem; line-height: 1.5; color: var(--muted-ink); }

.hero__visual { position: relative; }
.hero__photo { background: #1b1d1f; overflow: hidden; border-radius: var(--radius); }
.hero__photo img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; object-position: 50% 28%; }

.worksheet {
  position: relative;
  z-index: 1;
  width: min(100% - 2rem, 23rem);
  margin: -5.5rem auto 0;
  padding: 1.35rem 1.5rem 1.5rem;
  background: var(--card);
  border-top: 3px solid var(--mango);
  border-radius: var(--radius);
  box-shadow: 0 1px 1px rgba(17, 20, 23, 0.06), 0 18px 44px -14px rgba(17, 20, 23, 0.4);
}
.worksheet__tag {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
}
.worksheet__tag span { color: var(--muted-ink); }
.worksheet__list > div { padding-top: 0.95rem; margin-top: 0.95rem; border-top: 1px solid var(--line); }
.worksheet__list dt { font-size: 0.75rem; font-weight: 650; letter-spacing: 0.01em; color: var(--muted-ink); }
.worksheet__list dd { margin-top: 0.2rem; font-family: var(--font-serif); font-size: 1.125rem; font-weight: 500; line-height: 1.3; letter-spacing: -0.015em; }
.worksheet__next dt { color: var(--petroleum); }
.worksheet__next dd { font-weight: 650; }

@media (max-width: 26rem) {
  .hero__actions .btn { width: 100%; }
}
@media (min-width: 40rem) and (max-width: 63.99rem) {
  .hero__visual { max-width: 32rem; }
  .worksheet { margin: -9rem -1.5rem 0 auto; }
}
@media (min-width: 64rem) {
  .hero__grid { grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: 2rem; align-items: center; }
  .hero__text { grid-column: 1 / span 7; }
  .hero__visual { grid-column: 8 / span 5; margin-left: 4.5rem; }
  .worksheet {
    position: absolute;
    left: -6.5rem;
    top: 2.75rem;
    width: 18.5rem;
    margin: 0;
  }
}
@media (min-width: 64rem) and (max-height: 46rem) {
  .hero__photo img { aspect-ratio: 1 / 1; }
}

/* ---------- Ideia central */
.thesis { border-block: 1px solid var(--line); padding-block: clamp(3.5rem, 7vw, 6.5rem); background: var(--card); }
.thesis__grid { display: grid; gap: 1.75rem; }
.thesis__text {
  font-family: var(--font-serif);
  font-size: clamp(1.625rem, 1.05rem + 2.4vw, 3.125rem);
  font-weight: 450;
  line-height: 1.16;
  letter-spacing: -0.035em;
  text-wrap: balance;
  max-width: 26ch;
}
.thesis__text em { font-style: normal; font-weight: 650; color: var(--petroleum); }
@media (min-width: 64rem) {
  .thesis__grid { grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: 2rem; align-items: start; }
  .thesis__grid .label { grid-column: 1 / span 3; padding-top: 0.9rem; }
  .thesis__text { grid-column: 5 / span 8; max-width: 24ch; }
}

/* ---------- Estrutura de seção */
.section { padding-block: var(--section-y); }
.section--rule { border-top: 1px solid var(--line); }
.section--card { background: var(--card); border-block: 1px solid var(--line); }
.section__grid { display: grid; gap: 2rem; }
@media (min-width: 64rem) {
  .section__grid { grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: 2rem; }
  .section__aside { grid-column: 1 / span 3; padding-top: 0.9rem; }
  .section__main { grid-column: 5 / span 8; }
}

.section--ink { background: var(--ink); color: var(--paper); }
.section--petroleum { background: var(--petroleum); color: var(--paper); }
.section--ink .label,
.section--petroleum .label,
.label--on-ink { color: var(--on-ink-soft); }
.section--ink .label__num { color: var(--mango); }
.section--petroleum .label__num { color: var(--paper); }  /* manga sobre petróleo fica em 3,9:1 */
.section--ink .label__rule,
.section--petroleum .label__rule { background: var(--line-on-ink); }
.section--ink .muted { color: var(--on-ink-soft); }
.section--ink :focus-visible,
.section--petroleum :focus-visible,
.closing :focus-visible,
.site-footer :focus-visible { outline-color: var(--mango); }

.split { display: grid; gap: 1.5rem; margin-top: 2.5rem; padding-top: 2rem; border-top: 1px solid var(--line-on-ink); }
.split .lead { color: var(--on-ink); }
@media (min-width: 48rem) {
  .split { grid-template-columns: 1.15fr 1fr; gap: 2.5rem; }
  .split .muted { font-size: 0.9375rem; line-height: 1.7; padding-top: 0.3rem; }
}

/* ---------- 01 Cenas */
.scenes { margin-top: clamp(2.5rem, 5vw, 4rem); border-top: 1px solid var(--line-strong); counter-reset: scene; }
.scene {
  display: grid;
  gap: 0.6rem 2rem;
  padding-block: clamp(1.75rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--line);
}
.scene__kicker {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-ink);
}
.scene__title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.125rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  text-wrap: balance;
}
.scene__body { color: var(--muted-ink); max-width: 34rem; text-wrap: pretty; }
@media (min-width: 48rem) {
  .scene { grid-template-columns: 11rem minmax(0, 1fr); }
  .scene__kicker { grid-row: 1 / span 2; padding-top: 0.6rem; }
  .scene__body { margin-top: 0.35rem; }
}
.aside-note {
  margin-top: 2rem;
  padding-left: 1rem;
  border-left: 2px solid var(--petroleum);
  max-width: 34rem;
  font-size: 0.9375rem;
  color: var(--petroleum);
  font-weight: 550;
}

/* ---------- 02 Passagem informação → decisão */
.path {
  display: grid;
  margin-top: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--line-on-ink);
}
.path__step {
  display: grid;
  gap: 0;
  padding-block: 1.75rem 0.5rem;
  border-bottom: 1px solid var(--line-on-ink);
}
.path__num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--mango);
}
.path__title {
  margin-top: 0.9rem;
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 1.4rem + 1.1vw, 2.25rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.035em;
}
.path__desc { margin-top: 0.75rem; color: var(--on-ink); max-width: 30rem; }
.path__roles { display: grid; gap: 0; margin-top: 1.5rem; }
.role { padding-block: 0.9rem 1.1rem; border-top: 3px solid var(--paper); }
.role dt {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--on-ink-soft);
}
.role dd { margin-top: 0.3rem; font-size: 0.9375rem; line-height: 1.5; color: var(--on-ink); }
.role--ai { border-top-color: var(--mango); }
.role--ai dt { color: var(--mango); }
.role--none { border-top-style: dashed; border-top-width: 1px; border-top-color: rgba(242, 239, 231, 0.45); padding-top: calc(0.9rem + 2px); }
.role--none dt { color: var(--on-ink-soft); }
.role--none dd { font-weight: 700; color: var(--paper); }

.path__caveat {
  margin-top: 2rem;
  max-width: 44rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--on-ink-soft);
}

@media (min-width: 62rem) {
  .path {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-template-rows: repeat(5, auto);
    border-bottom: 0;
  }
  .path__step {
    grid-row: 1 / span 5;
    grid-template-rows: subgrid;
    padding-block: 2rem 0;
    border-bottom: 0;
  }
  .path__step > :not(.path__roles),
  .role { padding-right: 2rem; }
  .path__step + .path__step > :not(.path__roles),
  .path__step + .path__step .role { padding-left: 0; }
  .path__desc { margin-bottom: 2rem; }
  .path__roles { display: contents; }
  .role { margin-top: 0; }
  .path__caveat { margin-top: 2.5rem; }
}

/* ---------- 03 Exemplo ilustrativo */
.demo {
  margin-top: clamp(2.25rem, 4vw, 3.25rem);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper);
}
.demo__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem 1.5rem;
  padding: 0.9rem clamp(1rem, 2.5vw, 1.75rem);
  border-bottom: 1px solid var(--line-strong);
}
.demo__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
}
.demo__badge span {
  width: 0.7rem; height: 0.7rem;
  background: repeating-linear-gradient(135deg, var(--ink) 0 2px, transparent 2px 4px);
  border: 1px solid var(--ink);
}

/* Controle segmentado: o indicador é movido por mola (ver main.js) */
.seg {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  width: 100%;
  max-width: 26rem;
  padding: 4px;
  background: var(--muted);
  border-radius: var(--radius);
  box-shadow: inset 0 0 0 1px var(--line);
  touch-action: pan-y;
  user-select: none;
  -webkit-user-select: none;
}
.seg__thumb {
  position: absolute;
  top: 4px; bottom: 4px; left: 4px;
  width: calc((100% - 8px) / 3);
  background: var(--ink);
  border-radius: 1px;
  box-shadow: 0 1px 2px rgba(17, 20, 23, 0.25), 0 6px 14px -6px rgba(17, 20, 23, 0.45);
  transform: translate3d(0, 0, 0);
  will-change: transform;
  pointer-events: none;
}
.seg__btn {
  position: relative;
  z-index: 1;
  min-height: 2.75rem;
  padding: 0.25rem 0.35rem;
  border: 0;
  border-radius: 1px;
  background: transparent;
  color: #3d4549;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color 160ms var(--ease-out), opacity 120ms var(--ease-out);
}
.seg__btn:active { opacity: 0.6; }
.seg__btn.is-on { color: var(--paper); opacity: 1; }
.seg__btn[aria-selected="true"]::after {
  /* marca de estado que não depende só de cor */
  content: "";
  position: absolute;
  left: 50%; bottom: 0.4rem;
  width: 0.9rem; height: 2px;
  margin-left: -0.45rem;
  background: var(--mango);
}
.seg.is-dragging .seg__btn { transition: none; }
.seg__btn:focus-visible { outline-offset: -3px; outline-color: var(--mango); }
.seg__btn:not(.is-on):focus-visible { outline-color: var(--petroleum); }

.demo__panels { display: block; }
.panel { padding: clamp(1.5rem, 3vw, 2.5rem) clamp(1rem, 2.5vw, 1.75rem) clamp(1.75rem, 3vw, 2.5rem); }
.panel + .panel { border-top: 1px solid var(--line-strong); }
.panel:focus-visible { outline-offset: -4px; }
.panel__name {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 1.4rem + 1.4vw, 2.5rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.04em;
}
.panel__grid { display: grid; gap: 1.75rem; margin-top: 1.75rem; }
.panel__label {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.75rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-ink);
}
.panel__flag {
  padding: 0.15rem 0.45rem;
  border: 1px dashed var(--petroleum);
  color: var(--petroleum);
  letter-spacing: 0.08em;
}
.panel__scene,
.panel__next,
.panel__questions { margin-top: 0.9rem; }
.panel__scene { text-wrap: pretty; }
.panel__questions li {
  position: relative;
  padding-left: 1.4rem;
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.012em;
}
.panel__questions li + li { margin-top: 0.6rem; }
.panel__questions li::before {
  content: "?";
  position: absolute;
  left: 0; top: 0.05em;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--petroleum);
}
.panel__col--next { padding: 1.1rem 1.15rem 1.25rem; background: var(--card); border: 1px solid var(--line); border-left: 3px solid var(--petroleum); }
.panel__col--next .panel__label { border-bottom-style: dashed; }
.panel__next { font-weight: 600; text-wrap: pretty; }

@media (min-width: 58rem) {
  .panel__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr) minmax(0, 1fr); gap: 2rem; align-items: start; }
}

/* Com JavaScript: as três cenas ocupam a mesma célula, então trocar de cena
   não muda a altura do bloco nem empurra o resto da página. */
.js .demo__panels { display: grid; }
.js .panel {
  grid-area: 1 / 1;
  border-top: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 140ms linear, visibility 0s linear 140ms;
}
.js .panel.is-active {
  opacity: 1;
  visibility: visible;
  transition: opacity 240ms var(--ease-out) 90ms, visibility 0s;
}

/* ---------- 04 Etapas */
.steps { margin-top: clamp(2.5rem, 5vw, 4rem); border-top: 1px solid var(--line-strong); }
.step {
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr);
  gap: 0.35rem 1rem;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--line);
}
.step__num {
  grid-row: 1 / span 2;
  padding-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--petroleum);
}
.step__title { font-size: 1.1875rem; font-weight: 700; line-height: 1.3; letter-spacing: -0.02em; }
.step__body { color: var(--muted-ink); max-width: 36rem; text-wrap: pretty; }
@media (min-width: 52rem) {
  .step { grid-template-columns: 3.5rem minmax(0, 0.8fr) minmax(0, 1fr); gap: 2rem; align-items: baseline; padding-block: 1.75rem; }
  .step__num { grid-row: auto; padding-top: 0; }
  .step__title { font-size: 1.3125rem; }
}

/* ---------- 05 IA e pessoas */
.section--petroleum .h2 { max-width: 17ch; }
.pacts { display: grid; margin-top: clamp(2.5rem, 5vw, 4rem); border-top: 1px solid var(--line-on-ink); }
.pact { padding-block: 1.6rem; border-bottom: 1px solid var(--line-on-ink); }
.pact__title { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 600; line-height: 1.15; letter-spacing: -0.03em; text-wrap: balance; }
.pact__body { margin-top: 0.7rem; color: var(--on-ink); font-size: 1rem; text-wrap: pretty; }
@media (min-width: 52rem) {
  .pacts { grid-template-columns: repeat(3, minmax(0, 1fr)); column-gap: 2.5rem; border-top: 0; }
  .pact { border-top: 1px solid var(--line-on-ink); border-bottom: 0; padding-block: 1.6rem 0; }
}

/* ---------- 06 Quem está por trás */
.about { display: grid; gap: 2.5rem; }
.about__photo { max-width: 26rem; background: #1b1d1f; overflow: hidden; border-radius: var(--radius); }
.about__photo img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; }
.about__text .h2 { margin-top: 1.5rem; }
.about__lead {
  margin-top: 0.9rem;
  font-family: var(--font-serif);
  font-size: clamp(1.375rem, 1.2rem + 0.8vw, 1.875rem);
  font-weight: 450;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--petroleum);
  text-wrap: balance;
}
.about__text > p:not(.label):not(.about__lead) { margin-top: 1.25rem; max-width: 36rem; text-wrap: pretty; }
.about__lead + p { margin-top: 2rem !important; padding-top: 1.75rem; border-top: 1px solid var(--line-strong); }
.method {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
  max-width: 38rem;
  counter-reset: m;
}
.method li {
  counter-increment: m;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.3;
}
.method li::before {
  content: counter(m, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--petroleum);
}
.about .text-link { margin-top: 1.75rem; }
@media (min-width: 64rem) {
  .about { grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: 2rem; align-items: center; }
  .about__photo { grid-column: 1 / span 4; max-width: none; }
  .about__text { grid-column: 6 / span 7; }
}

/* ---------- 07 Dúvidas */
.faq { margin-top: clamp(2rem, 4vw, 3rem); border-top: 1px solid var(--line-strong); }
.faq__item { border-bottom: 1px solid var(--line); }
.faq__item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.25rem;
  padding-block: 1.1rem;
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.025em;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
  transition: color 160ms var(--ease-out);
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary:hover { color: var(--petroleum); }
.faq__item summary:active { opacity: 0.7; }
.faq__icon {
  position: relative;
  flex: none;
  width: 2rem; height: 2rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}
.faq__icon::before,
.faq__icon::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 0.75rem; height: 1.5px;
  margin: -0.75px 0 0 -0.375rem;
  background: currentColor;
  transition: transform 260ms var(--ease-out);
}
.faq__icon::after { transform: rotate(90deg); }
.faq__item[open] .faq__icon::after { transform: rotate(0deg); }
.faq__answer { padding: 0 3.5rem 1.6rem 0; max-width: 42rem; color: var(--muted-ink); text-wrap: pretty; }

/* Abertura suave onde o navegador permite animar a altura de <details>;
   nos demais, abre de imediato. */
@supports (interpolate-size: allow-keywords) {
  .faq { interpolate-size: allow-keywords; }
  .faq__item::details-content {
    block-size: 0;
    overflow: hidden;
    opacity: 0;
    transition: block-size 320ms var(--ease-out), opacity 240ms var(--ease-out), content-visibility 320ms allow-discrete;
  }
  .faq__item[open]::details-content { block-size: auto; opacity: 1; }
}

/* ---------- Encerramento */
.closing { background: var(--ink); color: var(--paper); padding-block: var(--section-y); }
.closing__grid { display: grid; gap: 2.5rem; }
.closing__title {
  margin-top: 1.5rem;
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 1.3rem + 5vw, 5.75rem);
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: -0.055em;
  text-wrap: balance;
  max-width: 12ch;
}
.closing__lead { font-size: clamp(1.0625rem, 1rem + 0.35vw, 1.25rem); line-height: 1.6; color: var(--on-ink); max-width: 32rem; text-wrap: pretty; }
.closing .btn { margin-top: 2rem; }
.closing__note { margin-top: 1.1rem; font-size: 0.8125rem; color: var(--on-ink-soft); }
@media (max-width: 26rem) {
  .closing .btn { width: 100%; }
}
@media (min-width: 64rem) {
  .closing__grid { grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: 2rem; align-items: end; }
  .closing__grid > :first-child { grid-column: 1 / span 7; }
  .closing__side { grid-column: 9 / span 4; padding-bottom: 0.5rem; }
}

/* ---------- Rodapé */
.site-footer { background: var(--ink); color: var(--paper); border-top: 1px solid var(--line-on-ink); padding-block: 2.25rem 2.75rem; }
.site-footer__inner { display: grid; gap: 1.25rem; align-items: center; }
.brand--on-ink .brand__mark { background: var(--paper); color: var(--ink); }
.site-footer__tag,
.site-footer__copy { font-size: 0.8125rem; color: var(--on-ink-soft); }
.site-footer__nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.75rem; }
.site-footer__nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.3em;
  text-decoration-color: var(--line-on-ink);
}
.site-footer__nav a:hover { text-decoration-color: var(--paper); }
@media (min-width: 56rem) {
  .site-footer__inner { grid-template-columns: auto 1fr auto auto; column-gap: 2.5rem; }
}

/* ---------- Preferências do usuário */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .btn:active { transform: none; }
  .seg__thumb { transition: none !important; }
  .btn:hover .icon,
  .text-link:hover .icon { transform: none; }
  /* a troca de cena continua com um cross-fade curto, sem deslocamento */
  .js .panel,
  .js .panel.is-active { transition: opacity 120ms linear !important; }
}
@media (prefers-reduced-transparency: reduce) {
  .site-header { background: var(--paper); -webkit-backdrop-filter: none; backdrop-filter: none; }
}
@media (prefers-contrast: more) {
  :root {
    --muted-ink: #2c3336;
    --line: rgba(17, 20, 23, 0.5);
    --line-strong: rgba(17, 20, 23, 0.8);
    --on-ink: #f2efe7;
    --on-ink-soft: #f2efe7;
    --line-on-ink: rgba(242, 239, 231, 0.6);
  }
  .site-header { background: var(--paper); -webkit-backdrop-filter: none; backdrop-filter: none; border-bottom-color: var(--ink); }
}
@media (forced-colors: active) {
  .seg__thumb { background: Highlight; forced-color-adjust: none; }
  .seg__btn.is-on { color: HighlightText; forced-color-adjust: none; }
  .btn { border: 1px solid ButtonText; }
}

@media print {
  .site-header { position: static; }
  .js .demo__panels { display: block; }
  .js .panel { opacity: 1; visibility: visible; }
  .seg { display: none; }
}