/* ============================================================================
   YARION Aviation — styles.css
   Tema: dark, sóbrio, técnico, institucional.
   Estrutura: 1) Tokens  2) Base/atmosfera  3) Layout  4) Header/nav
              5) Hero  6) Seções  7) Componentes  8) Footer  9) Responsivo
   ============================================================================ */

/* ============================================================
   1) TOKENS DE DESIGN
   ============================================================ */
:root {
  /* Cores — preto/grafite/aço com âmbar técnico muito pontual */
  --bg:           #0a0c10;   /* fundo near-black, leve cast navy/grafite */
  --bg-1:         #0e1117;   /* superfícies elevadas (cards, seção alt)  */
  --bg-2:         #141925;   /* hover / superfícies mais altas           */
  --line:         rgba(255, 255, 255, 0.08);   /* hairline padrão        */
  --line-strong:  rgba(255, 255, 255, 0.16);   /* hairline destacado     */

  --text:         #e9ebef;   /* prata / quase branco                     */
  --text-dim:     #99a1ae;   /* cinza aço                                */
  --text-mute:    #5c6473;   /* cinza chumbo (rótulos)                   */

  --accent:       #d6a24c;   /* âmbar / dourado técnico (uso pontual)    */
  --accent-soft:  rgba(214, 162, 76, 0.14);
  --accent-line:  rgba(214, 162, 76, 0.55);

  /* Tipografia */
  --font-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  /* Escala de espaçamento */
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Layout */
  --maxw:     1120px;
  --radius:   6px;
  --radius-lg: 10px;

  /* Header */
  --header-h: 64px;
}

/* ============================================================
   2) BASE / ATMOSFERA
   ============================================================ */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.65;
  font-weight: 400;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Atmosfera de fundo: brilho radial sutil no topo + textura de grão fina.
   Fixo, baixa opacidade — profundidade sem poluição visual. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 520px at 50% -8%, rgba(40, 56, 92, 0.30), transparent 70%),
    radial-gradient(700px 400px at 85% 8%, rgba(214, 162, 76, 0.05), transparent 70%);
  pointer-events: none;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.035;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; text-decoration: none; }

h1, h2, h3 {
  margin: 0;
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

p { margin: 0; }

ul { margin: 0; padding: 0; list-style: none; }

/* Foco visível (acessibilidade) */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Utilitários */
.mono {
  font-family: var(--font-mono);
  font-weight: 400;
  letter-spacing: 0.04em;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 50%;
  top: -60px;
  transform: translateX(-50%);
  background: var(--bg-2);
  border: 1px solid var(--line-strong);
  color: var(--text);
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  z-index: 200;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }

/* ============================================================
   3) LAYOUT
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding-block: var(--space-24);
  border-top: 1px solid var(--line);
}
.section--alt { background: var(--bg-1); }

.section__head { margin-bottom: var(--space-12); }

.section__eyebrow {
  color: var(--accent);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: var(--space-4);
}

.section__title {
  font-size: clamp(1.7rem, 4.2vw, 2.6rem);
  max-width: 18ch;
}

.section__sub {
  margin-top: var(--space-3);
  color: var(--text-dim);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}

.section__lead {
  margin-top: var(--space-4);
  color: var(--text-dim);
  max-width: 60ch;
  font-size: 1.05rem;
}

/* ============================================================
   4) HEADER / NAVEGAÇÃO
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(10, 12, 16, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}
/* Borda inferior aparece após rolar (controlado por JS) */
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(10, 12, 16, 0.88);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand { display: inline-flex; align-items: center; }
.brand__logo { height: 30px; width: auto; display: block; }

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  color: var(--text-dim);
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  position: relative;
  padding-block: 4px;
  transition: color 0.2s ease;
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.nav__link:hover { color: var(--text); }
.nav__link:hover::after,
.nav__link.is-active::after { transform: scaleX(1); }
.nav__link.is-active { color: var(--text); }

.nav__cta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--text);
  border: 1px solid var(--line-strong);
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.nav__cta:hover { border-color: var(--accent-line); background: var(--accent-soft); }

/* Botão hamburguer (mobile) */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0 10px;
}
.nav__toggle-bar {
  display: block;
  height: 1.5px;
  width: 100%;
  background: var(--text);
  transition: transform 0.25s ease, opacity 0.2s ease;
}

/* ============================================================
   5) HERO
   ============================================================ */
.hero {
  position: relative;
  padding-top: var(--space-16);
  padding-bottom: var(--space-12);
}
.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding-top: var(--space-12);
  gap: 0; /* gap controlado item a item via margin-bottom */
}

.hero__eyebrow {
  color: var(--text-mute);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  margin-bottom: var(--space-6);
}

.hero__title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5em;
  margin-bottom: var(--space-6);
}
.hero__title-mark {
  font-size: clamp(3rem, 12vw, 6.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 0.95;
  color: var(--text);
}
.hero__title-sub {
  font-size: clamp(1.1rem, 3.5vw, 1.9rem);
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--text-mute);
}

/* Logo (imagem) como peça central da hero */
.hero__logo-wrap { margin: 0 0 var(--space-8); line-height: 0; }
.hero__logo {
  display: block;
  width: 100%;
  max-width: 460px;
  height: auto;
}
.hero__logo--rvx { max-width: 540px; }

/* Hero centralizada (quando a peça principal é o logo simétrico) */
.hero--centered .hero__inner { align-items: center; text-align: center; }
.hero--centered .hero__actions { justify-content: center; }
.hero--centered .hero__subtitle { margin-left: auto; margin-right: auto; }

.hero__tagline {
  font-size: clamp(0.95rem, 2.4vw, 1.25rem);
  letter-spacing: 0.14em;
  color: var(--text-dim);
  margin-bottom: var(--space-8);
}
/* Separadores em âmbar na tagline da hero, bem discretos */
.hero__tagline { background: linear-gradient(transparent, transparent); }

.hero__subtitle {
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  color: var(--text);
  max-width: 42ch;
  margin-bottom: var(--space-10);
  font-weight: 400;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-16);
}

/* Gráfico-assinatura (eixo de decisão) */
.hero__visual {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent),
    var(--bg-1);
  padding: var(--space-8) var(--space-6);
}
.axis { width: 100%; height: auto; display: block; }

/* Estilos do SVG via classes (mantém cores no sistema de tokens) */
.axis-base   { stroke: var(--line-strong); stroke-width: 1.25; }
.axis-tick   { stroke: var(--text-mute); stroke-width: 1; opacity: 0.65; }
.axis-tick--major { stroke: var(--text-dim); stroke-width: 1.25; opacity: 0.9; }
.axis-guide  { stroke: var(--accent-line); stroke-width: 1; stroke-dasharray: 3 4; }
.axis-node       { fill: var(--accent); }
.axis-node-ring  { fill: none; stroke: var(--accent-line); stroke-width: 1.25; }
.axis-branch     { stroke: var(--text-mute); stroke-width: 1; opacity: 0.4; stroke-dasharray: 4 5; }
.axis-glow-stop-0 { stop-color: rgba(214, 162, 76, 0.30); }
.axis-glow-stop-1 { stop-color: rgba(214, 162, 76, 0); }
.axis-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  fill: var(--text-mute);
}
.axis-label--accent { fill: var(--accent); }
.axis-branch-label { font-size: 9.5px; opacity: 0.6; }

/* ============================================================
   6) BOTÕES
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  padding: 0.85rem 1.3rem;
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
  cursor: pointer;
  min-height: 44px; /* área de toque iOS mínima */
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.15s ease, color 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,0,0,0.25); }
.btn:active { transform: translateY(0); }
.btn__icon { transition: transform 0.2s ease; }
.btn:hover .btn__icon { transform: translateX(3px); }

.btn--primary {
  background: var(--bg-2);
  color: var(--text);
  border-color: var(--line-strong);
  position: relative;
}
.btn--primary::before {
  /* marcador âmbar sutil — sinaliza "ação/decisão" */
  content: "";
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 1px;
  margin-right: 0.1em;
}
.btn--primary:hover { border-color: var(--accent-line); background: #18202e; }

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

/* ============================================================
   7) COMPONENTES DE SEÇÃO
   ============================================================ */

/* --- Sobre / Áreas de atuação --- */
.about__text {
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  color: var(--text);
  max-width: 60ch;
  line-height: 1.6;
  margin-bottom: var(--space-12);
}
.areas {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.area {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  background: var(--bg);
  transition: background 0.2s ease;
}
.section--alt .area { background: var(--bg-1); }
.area:hover { background: var(--bg-2); }
.area__index { color: var(--accent); font-size: 0.72rem; min-width: 2ch; }
.area__label { color: var(--text); font-size: 0.98rem; }

/* --- YARION RVX (teaser) --- */
.rvx-teaser {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg);
  padding: var(--space-12) var(--space-8);
}
.section--alt .rvx-teaser { background: var(--bg-1); }

.slogan {
  font-size: clamp(1.3rem, 3.4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}
.slogan--pt {
  font-size: clamp(0.85rem, 2vw, 1rem);
  font-weight: 400;
  color: var(--text-mute);
  letter-spacing: 0.06em;
  margin-top: var(--space-2);
  margin-bottom: var(--space-8);
}
.rvx-teaser__text {
  color: var(--text-dim);
  max-width: 62ch;
  margin-bottom: var(--space-12);
  font-size: 1.05rem;
}

.rvx-letters {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}
.rvx-letter {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: var(--space-4);
  align-items: center;
  padding: var(--space-4) var(--space-6);
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent-line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.012);
}
.rvx-letter__key {
  grid-row: 1 / 3;
  font-size: 2rem;
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
}
.rvx-letter__name { font-weight: 600; color: var(--text); font-size: 1.05rem; }
.rvx-letter__desc { color: var(--text-dim); font-size: 0.92rem; }

/* --- Artigos --- */
.articles {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
.article-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-6) var(--space-6);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg);
  transition: border-color 0.25s ease, transform 0.2s ease, background 0.25s ease;
}
.section--alt .article-card { background: var(--bg); }
.article-card::before {
  /* tick âmbar no canto superior — detalhe técnico */
  content: "";
  position: absolute;
  top: 0; left: var(--space-6);
  width: 22px; height: 2px;
  background: var(--accent);
  opacity: 0.5;
  transition: opacity 0.25s ease, width 0.25s ease;
}
.article-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  background: var(--bg-1);
}
.article-card:hover::before { opacity: 1; width: 38px; }
.article-card__index { color: var(--text-mute); font-size: 0.78rem; }
.article-card__title { font-size: 1.18rem; line-height: 1.25; color: var(--text); }
.article-card__desc { color: var(--text-dim); font-size: 0.95rem; flex-grow: 1; }

.badge {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  padding: 0.3rem 0.6rem;
  border-radius: 100px;
  margin-top: var(--space-2);
}

/* --- Contato --- */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-12);
}
.contact__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--bg);
  transition: background 0.2s ease;
}
.contact__link:hover { background: var(--bg-2); }
.contact__link-label { color: var(--text-dim); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.1em; }
.contact__link-handle { color: var(--text); font-size: 1rem; }
.contact__link:hover .contact__link-handle { color: var(--accent); }

/* --- Disclaimer --- */
.disclaimer { display: grid; gap: var(--space-6); max-width: 76ch; }
.disclaimer__block {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  background: var(--bg);
}
.disclaimer__text { color: var(--text-dim); font-size: 0.98rem; line-height: 1.7; }
.notice { border-left: 2px solid var(--accent-line); }
.notice__tag {
  color: var(--accent);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

/* ============================================================
   7b) COMPONENTES EXCLUSIVOS DA PÁGINA /rvx
   ============================================================ */

/* Subtítulo técnico do hero do produto ("Decision Speed Performance") */
.rvx-hero__sub {
  color: var(--text-dim);
  font-size: clamp(0.95rem, 2.2vw, 1.1rem);
  letter-spacing: 0.08em;
  margin-top: var(--space-3);
}

/* Bracket no SVG do eixo de decisão (agrupa field length / V-speeds) */
.axis-bracket {
  fill: none;
  stroke: var(--text-mute);
  stroke-width: 1.1;
  stroke-linejoin: round;
  opacity: 0.7;
}

/* Detalhamento R / V / X */
.rvx-details {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}
.rvx-detail {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-6) var(--space-6);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent-line);
  border-radius: var(--radius-lg);
  background: var(--bg);
}
.section--alt .rvx-detail { background: var(--bg-1); }
.rvx-detail__key {
  font-size: 2.2rem;
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
}
.rvx-detail__name {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
}
.rvx-detail__desc {
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Chips técnicos (termos por trás de cada letra) */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}
.chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 0.28rem 0.62rem;
  white-space: nowrap;
}

/* Fórmula conceitual: RunVex = Run + V + X */
.formula {
  text-align: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg);
  padding: var(--space-12) var(--space-6);
}
.section--alt .formula { background: var(--bg-1); }
.formula__expr {
  font-size: clamp(1.4rem, 4vw, 2.1rem);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-dim);
}
.formula__expr span { color: var(--accent); }
.formula__legend {
  color: var(--text-mute);
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  margin-top: var(--space-4);
}

/* Slot reservado para o app (PWA) — placeholder técnico, borda tracejada */
.app-slot {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-3);
  padding: var(--space-24) var(--space-8);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(420px 200px at 50% 0%, rgba(214, 162, 76, 0.05), transparent 70%),
    var(--bg);
}
.section--alt .app-slot { background: var(--bg-1); }
.app-slot__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  padding: 0.3rem 0.6rem;
  border-radius: 100px;
}
.app-slot__title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin-top: var(--space-3);
}
.app-slot__text {
  color: var(--text-dim);
  font-size: 0.98rem;
  line-height: 1.6;
  max-width: 56ch;
}

/* Lista de limites ("O RVX não substitui") */
.disclaimer__sub {
  color: var(--text-dim);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}
.limits { display: grid; gap: var(--space-3); }
.limits li {
  position: relative;
  padding-left: var(--space-6);
  color: var(--text-dim);
  font-size: 0.98rem;
  line-height: 1.55;
}
.limits li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 12px;
  height: 1.5px;
  background: var(--accent);
  opacity: 0.7;
}

/* Responsivo: detalhes R/V/X em 3 colunas no desktop */
@media (min-width: 900px) {
  .rvx-details { grid-template-columns: repeat(3, 1fr); }
}

/* ============================================================
   8) FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--line);
  padding-block: var(--space-16) var(--space-8);
  background: var(--bg-1);
}
.footer__top {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}
.footer__logo { height: 34px; width: auto; display: block; margin-bottom: var(--space-3); }
.footer__tagline { color: var(--text-dim); font-size: 0.85rem; letter-spacing: 0.1em; }
.footer__nav { display: flex; flex-wrap: wrap; gap: var(--space-6); }
.footer__nav a { color: var(--text-dim); font-size: 0.95rem; transition: color 0.2s ease; }
.footer__nav a:hover { color: var(--text); }

.footer__mini-disclaimer {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.65;
  max-width: 70ch;
  padding-top: var(--space-8);
  border-top: 1px solid var(--line-strong);
  margin-bottom: var(--space-8);
}
.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  color: var(--text-dim);
  font-size: 0.88rem;
}

/* ============================================================
   9) ANIMAÇÃO DE ENTRADA (reveal) — sutil
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   10) RESPONSIVO
   ============================================================ */

/* Tablet+ */
@media (min-width: 640px) {
  .areas { grid-template-columns: repeat(2, 1fr); }
  .articles { grid-template-columns: repeat(2, 1fr); }
  .contact__grid { grid-template-columns: repeat(2, 1fr); }
  .rvx-letters { grid-template-columns: repeat(3, 1fr); }
  .rvx-letter { grid-template-columns: 1fr; grid-template-rows: auto auto auto; }
  .rvx-letter__key { grid-row: auto; }
}

/* Desktop */
@media (min-width: 900px) {
  .container { padding-inline: var(--space-8); }
  .areas { grid-template-columns: repeat(3, 1fr); }
  .articles { grid-template-columns: repeat(3, 1fr); }
  .footer__top { flex-direction: row; align-items: flex-end; justify-content: space-between; }
}

/* --- Navegação mobile (até 768px) --- */
@media (max-width: 768px) {
  .nav__toggle { display: flex; }

  /* Trava o scroll do fundo e escurece o conteúdo com um scrim */
  body.nav-open { overflow: hidden; }
  body.nav-open::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 90; /* abaixo do header (100), acima do conteúdo */
    background: rgba(6, 8, 11, 0.82);
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
  }

  .nav__menu {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-1); /* sólido — não compete com o fundo */
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line-strong);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
    padding: var(--space-3) var(--space-6) var(--space-8);
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.22s ease, opacity 0.22s ease;
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
  }
  body.nav-open .nav__menu {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav__menu li { border-bottom: 1px solid var(--line); }
  .nav__menu li:last-child { border-bottom: none; }
  .nav__link {
    display: block;
    padding: 1.1rem var(--space-2); /* área de toque ≥44px */
    font-size: 1.15rem;
    color: var(--text); /* contraste alto */
    letter-spacing: 0.005em;
  }
  .nav__link.is-active { color: var(--accent); }
  .nav__link::after { display: none; }
  .nav__cta {
    display: flex;
    justify-content: center;
    margin-top: var(--space-6);
    padding: 1rem 1rem;
    font-size: 0.9rem;
    letter-spacing: 0.04em;
    border-color: var(--accent-line);
    color: var(--text);
    min-height: 44px;
  }

  /* Hamburguer -> X quando aberto */
  body.nav-open .nav__toggle-bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
  body.nav-open .nav__toggle-bar:nth-child(2) { opacity: 0; }
  body.nav-open .nav__toggle-bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

  .section { padding-block: var(--space-16); }
  .hero__visual { padding: var(--space-4) var(--space-2); }
  .hero { padding-top: var(--space-12); padding-bottom: var(--space-8); }
  .hero__inner { padding-top: var(--space-8); gap: 0; }
}

/* --- Respeita usuários que preferem menos movimento --- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn:hover { transform: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ============================================================
   9) MÍDIA — slots prontos para fotos reais de aeronaves (etapa 2)
   Uso: descomente um <figure class="media-slot"> no HTML e troque o src.
   Identidade preservada: hairline, cantos suaves, fundo sóbrio.
   ============================================================ */
.media-slot {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent),
    var(--bg-1);
}
.media-slot img { width: 100%; height: 100%; object-fit: cover; display: block; }
.media-slot--tall { aspect-ratio: 4 / 5; }
.media-slot--wide { aspect-ratio: 21 / 9; }
.media-slot__caption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--text-mute);
  margin-top: var(--space-2);
}

/* CTA discreto dos cards de artigo */
.article-card__cta {
  margin-top: var(--space-2);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-mute);
  transition: color 0.2s ease;
}
.article-card:hover .article-card__cta { color: var(--text-dim); }

/* ============================================================
   10) LEGIBILIDADE NO MOBILE
   Aumenta tamanho/contraste e reduz tracking em telas pequenas,
   mantendo o tracking elegante nos rótulos curtos.
   ============================================================ */
@media (max-width: 640px) {
  /* corpo e descrições técnicas */
  .about__text { font-size: 1.05rem; line-height: 1.7; }
  .section__lead { font-size: 1.02rem; }
  .rvx-teaser__text,
  .rvx-detail__desc { font-size: 1rem; line-height: 1.7; }

  /* hero: mais respiro entre logo, tagline, subtítulo e botões */
  .hero__eyebrow { margin-bottom: var(--space-8); }
  .hero__logo-wrap { margin-bottom: var(--space-10); }
  .hero__tagline { margin-bottom: var(--space-8); }
  .hero__subtitle { margin-bottom: var(--space-8); font-size: 1.05rem; }
  .hero__actions { gap: var(--space-3); flex-direction: column; align-items: stretch; margin-bottom: var(--space-10); }
  .hero__actions .btn { justify-content: center; width: 100%; }

  /* cards de artigos */
  .article-card { padding: var(--space-6) var(--space-4) var(--space-4); }
  .article-card__title { font-size: 1.1rem; line-height: 1.3; }
  .article-card__desc { font-size: 1rem; line-height: 1.65; color: var(--text-dim); }

  /* rótulos pequenos: levemente maiores e com menos tracking */
  .badge,
  .article-card__cta { font-size: 0.74rem; letter-spacing: 0.08em; }
  .area__label { font-size: 1rem; }
  .chip { font-size: 0.78rem; padding: 0.32rem 0.7rem; }
  .section__eyebrow { font-size: 0.75rem; }

  /* -------------------------------------------------------
     CONTATO MOBILE: cards empilhados em vez de tabela
     ------------------------------------------------------- */
  .contact__grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    background: transparent;
    border: none;
    border-radius: 0;
    overflow: visible;
  }
  .contact__link {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-5);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-lg);
    background: var(--bg-1);
    min-height: 72px;
  }
  .contact__link-label {
    font-size: 0.74rem;
    letter-spacing: 0.12em;
    color: var(--text-mute);
    text-transform: uppercase;
  }
  .contact__link-handle {
    font-size: 1.05rem;
    color: var(--text);
    word-break: break-all;
  }
  .contact__link:hover { background: var(--bg-2); }
  .contact__link:hover .contact__link-handle { color: var(--accent); }

  /* -------------------------------------------------------
     SEÇÃO RVX: mais respiro e escaneabilidade
     ------------------------------------------------------- */
  .rvx-detail {
    padding: var(--space-6) var(--space-4) var(--space-4);
    gap: var(--space-3);
  }
  .rvx-detail__key { font-size: 2rem; }
  .rvx-detail__name { font-size: 1.1rem; }
  .rvx-details { gap: var(--space-6); }

  .rvx-letter { padding: var(--space-4) var(--space-4); }
  .rvx-letter__key { font-size: 1.8rem; }
  .rvx-letters { gap: var(--space-4); margin-bottom: var(--space-8); }

  .slogan { font-size: clamp(1.15rem, 5vw, 1.5rem); }

  .formula { padding: var(--space-8) var(--space-4); }
  .formula__expr { font-size: clamp(1.2rem, 5.5vw, 1.6rem); }

  .app-slot { padding: var(--space-16) var(--space-6); }

  /* disclaimer */
  .disclaimer__text { font-size: 1.02rem; line-height: 1.75; }
  .disclaimer__sub,
  .notice__tag { font-size: 0.8rem; letter-spacing: 0.1em; }
  .disclaimer__block { padding: var(--space-6) var(--space-4); }
  .limits li { font-size: 1rem; padding-left: var(--space-5); }

  /* botões com toque confortável */
  .btn { padding: 0.9rem 1.25rem; font-size: 0.95rem; min-height: 48px; }

  /* CTA de contato: full-width */
  .contact__cta .btn { width: 100%; justify-content: center; }

  /* rodapé mais legível */
  .footer__nav { gap: var(--space-4); }
  .footer__nav a { font-size: 1rem; min-height: 36px; display: inline-flex; align-items: center; }
  .footer__tagline { font-size: 0.88rem; letter-spacing: 0.08em; color: var(--text-dim); }
  .footer__mini-disclaimer { font-size: 0.88rem; line-height: 1.7; color: var(--text-dim); }
  .footer__bottom { font-size: 0.88rem; color: var(--text-dim); }

  /* títulos grandes: tracking mais natural para leitura */
  .section__title { letter-spacing: -0.01em; }

  /* espaçamento das seções na RVX: mais fôlego entre blocos */
  .rvx-teaser { padding: var(--space-8) var(--space-4); }
  .rvx-teaser__text { margin-bottom: var(--space-8); font-size: 1rem; }
}