/* ==========================================================
   TURBINA — Design Tokens
   Cor:  --bg #0A0C10 · --bg-2 #12151C · --ink #EDEFF4 · --muted #8891A7
         --cyan #4FD1FF · --violet #8C6DFF · --win #4CC2FF · --mac #E8E8ED · --linux #F5B700
   Tipo: Display "Space Grotesk" · Corpo "Inter" · Utilitário/código "JetBrains Mono"
   ========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg: #0a0c10;
  --bg-2: #12151c;
  --bg-3: #181c26;
  --ink: #edeff4;
  --muted: #8891a7;
  --muted-2: #5c6478;
  --cyan: #4fd1ff;
  --violet: #8c6dff;
  --win: #4cc2ff;
  --mac: #e8e8ed;
  --linux: #f5b700;
  --line: rgba(237, 239, 244, 0.08);
  --line-2: rgba(237, 239, 244, 0.14);
  --shadow-soft: 0 20px 60px rgba(0, 0, 0, 0.45);
  --radius: 20px;
}

/* Registro da custom property usada na borda-gradiente animada dos cards.
   Sem suporte (Firefox < 128), o navegador ignora e a borda fica estática — não quebra. */
@property --angle {
  syntax: '<angle>';
  inherits: false;
  initial-value: 0deg;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', sans-serif;
  overflow-x: hidden;
  position: relative;
}

body.menu-open { overflow: hidden; }

/* ---------- Fundo em camadas ---------- */
.bg-scene {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  --px: 0px;
  --py: 0px;
}

.bg-scene::before {
  content: '';
  position: absolute;
  inset: -20%;
  background-image:
    linear-gradient(rgba(237,239,244,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(237,239,244,0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 55% at 50% 20%, black 20%, transparent 75%);
  animation: driftGrid 60s linear infinite;
}

@keyframes driftGrid {
  from { transform: translate(0,0); }
  to { transform: translate(64px, 64px); }
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  transition: transform 0.6s cubic-bezier(.2,.8,.2,1);
  will-change: transform;
}
.orb-1 {
  width: 520px; height: 520px; background: var(--violet); top: -150px; left: -120px;
  transform: translate3d(calc(var(--px) * 0.6), calc(var(--py) * 0.6), 0);
}
.orb-2 {
  width: 620px; height: 620px; background: var(--cyan); top: 20%; right: -200px; opacity: 0.22;
  transform: translate3d(calc(var(--px) * -0.4), calc(var(--py) * 0.3), 0);
}
.orb-3 {
  width: 420px; height: 420px; background: var(--linux); bottom: -180px; left: 30%; opacity: 0.14;
  transform: translate3d(calc(var(--px) * 0.3), calc(var(--py) * -0.5), 0);
}

/* Viga de luz atrás do hero — estática (sem custo de animação extra),
   reforça a profundidade sem competir com as orbs que já se movem. */
.bg-scene::after {
  content: '';
  position: absolute;
  top: -10%;
  left: 50%;
  width: 900px;
  height: 700px;
  transform: translateX(-50%);
  background: conic-gradient(from 200deg at 50% 0%, transparent 0deg, rgba(79,209,255,0.08) 40deg, transparent 90deg, rgba(140,109,255,0.06) 140deg, transparent 200deg);
  filter: blur(40px);
  opacity: 0.8;
}

.grain {
  position: absolute;
  inset: 0;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* Vinheta — escurece as bordas da tela para dar profundidade.
   Sutil de propósito: os orbs já têm opacidade calibrada, uma vinheta forte apaga esse trabalho. */
.vignette {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: radial-gradient(ellipse 85% 75% at 50% 35%, transparent 60%, rgba(0,0,0,0.5) 100%);
}

/* ---------- Layout base ---------- */
.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 1;
}

section { position: relative; z-index: 1; }

/* ---------- Nav ---------- */
nav.top {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  background: rgba(10, 12, 16, 0.65);
  border-bottom: 1px solid var(--line);
  transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
nav.top.is-scrolled {
  background: rgba(10, 12, 16, 0.85);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}
nav.top .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  transition: height 0.3s ease;
}
nav.top.is-scrolled .wrap { height: 58px; }
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  transition: font-size 0.3s ease;
}
nav.top.is-scrolled .brand { font-size: 1.03rem; }
.brand .blade-icon { width: 26px; height: 26px; }
.nav-links {
  display: flex;
  gap: 34px;
  align-items: center;
}
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-cta {
  border: 1px solid var(--line-2);
  padding: 9px 18px;
  border-radius: 100px;
  color: var(--ink) !important;
}
.nav-cta:hover { border-color: var(--cyan); background: rgba(79,209,255,0.08); }

/* ---------- Menu mobile (funcional) ---------- */
.menu-toggle {
  display: none;
  position: relative;
  z-index: 60;
  width: 42px; height: 42px;
  align-items: center;
  justify-content: center;
  background: rgba(237,239,244,0.04);
  border: 1px solid var(--line-2);
  border-radius: 10px;
  cursor: pointer;
  padding: 0;
}
.menu-toggle:hover { border-color: var(--cyan); }
.menu-toggle .bar {
  display: block;
  width: 18px; height: 2px;
  background: var(--ink);
  border-radius: 2px;
  position: relative;
  transition: background 0.2s ease;
}
.menu-toggle .bar::before,
.menu-toggle .bar::after {
  content: '';
  position: absolute; left: 0;
  width: 18px; height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform 0.25s cubic-bezier(.2,.8,.2,1), top 0.25s ease, opacity 0.2s ease;
}
.menu-toggle .bar::before { top: -6px; }
.menu-toggle .bar::after { top: 6px; }
.menu-toggle[aria-expanded="true"] .bar { background: transparent; }
.menu-toggle[aria-expanded="true"] .bar::before { top: 0; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .bar::after { top: 0; transform: rotate(-45deg); }

.mobile-panel {
  position: fixed;
  inset: 0;
  z-index: 55;
  display: flex;
  flex-direction: column;
  background: rgba(10,12,16,0.97);
  backdrop-filter: blur(20px);
  padding: 100px 32px 40px;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(.2,.8,.2,1);
  visibility: hidden;
}
.mobile-panel.is-open { transform: translateX(0); visibility: visible; }
.mobile-panel a {
  color: var(--ink);
  text-decoration: none;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.4rem;
  font-weight: 600;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(10px);
}
.mobile-panel.is-open a { animation: mobileLinkIn 0.5s ease forwards; }
.mobile-panel a:nth-child(1) { animation-delay: 0.08s; }
.mobile-panel a:nth-child(2) { animation-delay: 0.14s; }
.mobile-panel a:nth-child(3) { animation-delay: 0.20s; }
.mobile-panel a:nth-child(4) { animation-delay: 0.26s; }
.mobile-panel .nav-cta { margin-top: 20px; text-align: center; align-self: flex-start; }
@keyframes mobileLinkIn { to { opacity: 1; transform: translateY(0); } }

.menu-toggle { }
@media (max-width: 980px) {
  .menu-toggle { display: flex; }
}

/* ---------- Hero ---------- */
.hero {
  padding: 108px 0 60px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 40px;
  perspective: 1400px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--cyan);
  border: 1px solid rgba(79,209,255,0.3);
  background: rgba(79,209,255,0.06);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 26px;
}
.eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.3} }

h1.headline {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(2.4rem, 4.6vw, 3.85rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
}
h1.headline .accent {
  background: linear-gradient(100deg, var(--cyan), var(--violet) 70%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lede {
  font-size: 1.08rem;
  line-height: 1.65;
  color: var(--muted);
  max-width: 480px;
  margin: 0 0 34px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 44px; }

.btn {
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 26px;
  border-radius: 12px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  color: #06080c;
  box-shadow: 0 8px 30px rgba(79,209,255,0.25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 36px rgba(79,209,255,0.38); }
.btn-ghost {
  background: rgba(237,239,244,0.04);
  color: var(--ink);
  border: 1px solid var(--line-2);
}
.btn-ghost:hover { border-color: var(--cyan); transform: translateY(-2px); }

.trust-row {
  display: flex;
  gap: 26px;
  color: var(--muted-2);
  font-size: 0.82rem;
  font-family: 'JetBrains Mono', monospace;
}
.trust-row span { display: flex; align-items: center; gap: 7px; }
.trust-row svg { width: 15px; height: 15px; opacity: 0.7; }

/* ---------- Turbina 3D (elemento assinatura) ---------- */
.turbine-stage {
  position: relative;
  height: 460px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-style: preserve-3d;
}
.turbine-ring {
  position: absolute;
  width: 380px; height: 380px;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  animation: spinSlow 40s linear infinite;
}
.turbine-ring.r2 { width: 300px; height: 300px; border-style: dashed; opacity: 0.5; animation-duration: 30s; animation-direction: reverse; }
@keyframes spinSlow { from { transform: rotate(0deg);} to { transform: rotate(360deg);} }

.turbine-core {
  position: relative;
  width: 260px;
  height: 260px;
  transform-style: preserve-3d;
  animation: floatY 6s ease-in-out infinite;
}
@keyframes floatY {
  0%,100% { transform: translateY(0px) rotateX(8deg); }
  50% { transform: translateY(-16px) rotateX(8deg); }
}
.blade-wrap {
  position: absolute; inset: 0;
  animation: spinBlade 5s linear infinite;
  transform-style: preserve-3d;
}
@keyframes spinBlade { from { transform: rotateZ(0deg);} to { transform: rotateZ(360deg);} }

.blade {
  position: absolute;
  top: 50%; left: 50%;
  width: 120px; height: 46px;
  border-radius: 50% 50% 50% 4%;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  transform-origin: 0% 50%;
  opacity: 0.92;
  box-shadow: 0 0 30px rgba(79,209,255,0.25);
}
.blade:nth-child(1) { transform: translate(0,-50%) rotate(0deg); }
.blade:nth-child(2) { transform: translate(0,-50%) rotate(72deg); }
.blade:nth-child(3) { transform: translate(0,-50%) rotate(144deg); }
.blade:nth-child(4) { transform: translate(0,-50%) rotate(216deg); }
.blade:nth-child(5) { transform: translate(0,-50%) rotate(288deg); }

.turbine-hub {
  position: absolute;
  top: 50%; left: 50%;
  width: 74px; height: 74px;
  transform: translate(-50%,-50%);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #2a2f3d, #0d0f14 75%);
  border: 1px solid var(--line-2);
  box-shadow: inset 0 0 20px rgba(0,0,0,0.6), 0 0 40px rgba(140,109,255,0.35);
  z-index: 2;
}

/* ---------- Seções gerais ---------- */
.section-head { max-width: 620px; margin: 0 0 56px; }
.section-head .eyebrow { margin-bottom: 18px; }
h2.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(1.9rem, 3vw, 2.5rem);
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}
.section-head p { color: var(--muted); font-size: 1.02rem; line-height: 1.6; margin: 0; }

/* ---------- Como funciona ---------- */
.steps {
  padding: 100px 0 40px;
}
.step-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.step-card {
  position: relative;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 24px;
  transition: border-color 0.3s ease, transform 0.3s ease;
}
.step-card:hover { transform: translateY(-3px); }
.step-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--cyan);
  margin-bottom: 18px;
  display: block;
}
.step-card h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.08rem;
  margin: 0 0 10px;
}
.step-card p { color: var(--muted); font-size: 0.92rem; line-height: 1.55; margin: 0; }
.step-card::after {
  content: '';
  position: absolute;
  top: 30px; right: -22px;
  width: 22px; height: 1px;
  background: var(--line-2);
  display: none;
}

/* Borda com gradiente animado (cards premium) — técnica de máscara dupla,
   não interfere no ::before de brilho radial já existente em .os-card */
.step-card::before,
.os-card > .gradient-border {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: conic-gradient(from var(--angle, 0deg), var(--cyan), var(--violet), var(--linux), var(--cyan));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
  animation: spinAngle 4s linear infinite paused;
}
.step-card:hover::before,
.os-card:hover > .gradient-border {
  opacity: 1;
  animation-play-state: running;
}
@keyframes spinAngle { to { --angle: 360deg; } }

/* ---------- Cards de sistema (OS) ---------- */
.systems { padding: 60px 0 100px; perspective: 1600px; }
.os-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.os-card {
  background: linear-gradient(160deg, var(--bg-2), var(--bg-3));
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 36px 30px;
  transform-style: preserve-3d;
  transition: transform 0.35s cubic-bezier(.2,.8,.2,1), box-shadow 0.35s ease, border-color 0.35s ease;
  will-change: transform;
  position: relative;
  overflow: hidden;
  scroll-margin-top: 100px; /* compensa a nav sticky ao chegar via âncora (#os-win etc.) */
}
.os-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--mx,50%) var(--my,0%), rgba(255,255,255,0.06), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.os-card:hover::before { opacity: 1; }
.os-card:hover {
  box-shadow: var(--shadow-soft);
  border-color: var(--line-2);
}
/* .gradient-border: <span class="gradient-border" aria-hidden="true"></span> dentro de cada .os-card */
.os-card > .gradient-border {
  border-radius: 24px;
  z-index: 1;
}
.os-icon {
  width: 52px; height: 52px;
  margin-bottom: 22px;
  display: flex; align-items: center; justify-content: center;
}
.os-card h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.35rem;
  margin: 0 0 8px;
}
.os-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.74rem;
  color: var(--muted-2);
  display: block;
  margin-bottom: 20px;
}
.os-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 26px;
  display: flex;
  flex-direction: column;
  gap: 11px;
}
.os-card ul li {
  font-size: 0.88rem;
  color: var(--muted);
  display: flex;
  gap: 10px;
  align-items: flex-start;
  line-height: 1.4;
}
.os-card ul li svg { width: 14px; height: 14px; margin-top: 3px; flex-shrink: 0; }

.os-win .os-icon svg { color: var(--win); }
.os-mac .os-icon svg { color: var(--mac); }
.os-linux .os-icon svg { color: var(--linux); }
.os-win ul li svg { color: var(--win); }
.os-mac ul li svg { color: var(--mac); }
.os-linux ul li svg { color: var(--linux); }

.os-download {
  width: 100%;
  justify-content: center;
  border-radius: 12px;
  padding: 13px 20px;
  font-size: 0.9rem;
}
.os-win .os-download { background: linear-gradient(135deg, var(--win), #2a8bd6); color: #06080c; }
.os-mac .os-download { background: linear-gradient(135deg, #fff, #c7c9d6); color: #06080c; }
.os-linux .os-download { background: linear-gradient(135deg, var(--linux), #d99000); color: #06080c; }

.os-meta {
  margin-top: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted-2);
  text-align: center;
}

/* ---------- Terminal preview ---------- */
.terminal-section { padding: 20px 0 100px; }
.terminal-window {
  background: #0d0f14;
  border: 1px solid var(--line-2);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transform: rotateX(2deg);
  transform-style: preserve-3d;
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background: #12151c;
  border-bottom: 1px solid var(--line);
}
.terminal-bar span { width: 11px; height: 11px; border-radius: 50%; }
.terminal-bar span:nth-child(1) { background: #ff5f57; }
.terminal-bar span:nth-child(2) { background: #febc2e; }
.terminal-bar span:nth-child(3) { background: #28c840; }
.terminal-bar .path {
  margin-left: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--muted-2);
}
.terminal-body {
  padding: 26px 24px 34px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88rem;
  line-height: 1.9;
  color: #b7f5c4;
  min-height: 220px;
}
.terminal-body .muted-l { color: var(--muted); }
.terminal-body .prompt { color: var(--cyan); }
.terminal-body .cursor {
  display: inline-block;
  width: 8px; height: 15px;
  background: var(--cyan);
  margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: middle;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- FAQ ---------- */
.faq { padding: 20px 0 110px; max-width: 780px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 24px 0;
}
.faq-item summary {
  cursor: pointer;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1.02rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--cyan);
  transition: transform 0.25s ease;
  font-weight: 400;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p {
  color: var(--muted);
  margin: 14px 0 0;
  line-height: 1.65;
  font-size: 0.95rem;
}

/* ---------- Reveal ao rolar ----------
   Classe em vez de transform inline: assim o tilt 3D (que também escreve
   em .style.transform) nunca sobrescreve o estado de entrada. */
.reveal-pending {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(.2,.8,.2,1);
}
.reveal-pending.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Botão voltar ao topo ---------- */
.back-to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 45;
  width: 48px; height: 48px;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  background: rgba(18,21,28,0.9);
  backdrop-filter: blur(10px);
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px) scale(0.9);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease, border-color 0.3s ease;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}
.back-to-top.is-visible { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.back-to-top:hover { border-color: var(--cyan); transform: translateY(-3px) scale(1); }
.back-to-top svg { width: 20px; height: 20px; }

/* ---------- Foco de teclado visível ---------- */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
.menu-toggle:focus-visible,
.back-to-top:focus-visible,
.faq-item summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 8px;
}

.os-card.is-detected {
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(79,209,255,0.35), var(--shadow-soft);
}
.os-detected-badge {
  position: absolute;
  top: 18px; right: 18px;
  z-index: 2;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: #06080c;
  background: var(--cyan);
  padding: 5px 11px;
  border-radius: 100px;
}

.os-card.is-locked {
  opacity: 0.55;
  filter: grayscale(0.35);
  transition: opacity 0.3s ease, filter 0.3s ease;
}
.os-card.is-locked:hover {
  opacity: 0.8;
  filter: grayscale(0.15);
}
.os-card.is-locked .os-download {
  font-size: 0.76rem;
  cursor: not-allowed;
}

/* ---------- Toast de download (dispara UMA vez: 45s de permanência OU exit-intent) ---------- */
.os-toast {
  position: fixed;
  left: 26px;
  bottom: 26px;
  z-index: 46;
  max-width: 320px;
  background: rgba(18,21,28,0.96);
  border: 1px solid var(--line-2);
  border-radius: 16px;
  padding: 18px 18px 18px 20px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-soft);
  display: flex;
  gap: 12px;
  align-items: flex-start;
  transform: translateY(14px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease, transform 0.35s cubic-bezier(.2,.8,.2,1);
}
.os-toast.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.os-toast .os-toast-icon {
  width: 34px; height: 34px;
  flex-shrink: 0;
  border-radius: 9px;
  background: rgba(79,209,255,0.1);
  border: 1px solid rgba(79,209,255,0.25);
  display: flex; align-items: center; justify-content: center;
  color: var(--cyan);
}
.os-toast .os-toast-icon svg { width: 17px; height: 17px; }
.os-toast-body { flex: 1; min-width: 0; }
.os-toast p {
  margin: 0 0 10px;
  font-size: 0.86rem;
  color: var(--ink);
  line-height: 1.45;
}
.os-toast p strong { color: var(--cyan); font-weight: 600; }
.os-toast a.os-toast-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #06080c;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  font-weight: 600;
  font-size: 0.82rem;
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 9px;
  transition: transform 0.2s ease;
}
.os-toast a.os-toast-link:hover { transform: translateY(-1px); }
.os-toast button.os-toast-close {
  background: none;
  border: none;
  color: var(--muted-2);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  padding: 2px;
  flex-shrink: 0;
  transition: color 0.2s ease;
}
.os-toast button.os-toast-close:hover { color: var(--ink); }

@media (max-width: 560px) {
  .os-toast { left: 14px; right: 14px; bottom: 90px; max-width: none; }
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 48px 0 40px;
}
.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-links { display: flex; gap: 26px; }
.footer-links a { color: var(--muted); text-decoration: none; font-size: 0.88rem; }
.footer-links a:hover { color: var(--ink); }
.footer-note { color: var(--muted-2); font-size: 0.8rem; font-family: 'JetBrains Mono', monospace; }

/* ---------- Responsivo ---------- */
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; padding-top: 130px; }
  .turbine-stage { height: 320px; order: -1; }
  .step-grid { grid-template-columns: repeat(2, 1fr); }
  .os-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}

/* Tablet (ex: iPad em pé, ~768-980px): o breakpoint acima derruba os
   cards de OS pra 1 coluna, o que desperdiça a largura disponível nessa
   faixa. Aqui eles voltam pra 2 colunas — o 3º card fica sozinho na
   linha de baixo, o que é aceitável e ainda melhor que empilhar tudo. */
@media (min-width: 661px) and (max-width: 980px) {
  .os-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .wrap { padding: 0 20px; }
  h1.headline { font-size: 2.1rem; }
  .step-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .trust-row { flex-direction: column; gap: 10px; }
  .turbine-core { transform: scale(0.8); }
  .back-to-top { right: 18px; bottom: 18px; width: 44px; height: 44px; }
}

/* Desktop grande / wide (>=1440px): o .wrap continua centralizado com
   largura fixa de propósito — conteúdo esticado até a borda em telas
   ultrawide prejudica leitura. O que ganha escala aqui é só o elemento
   visual (turbina), que senão fica pequeno demais sobrando espaço vazio
   ao redor num monitor grande. */
@media (min-width: 1440px) {
  .turbine-stage { height: 520px; }
  .turbine-core { transform: scale(1.12); }
  .os-grid { gap: 32px; }
}