/* ============================================
   SIGA SUSTENTÁVEL — Folha de estilos
   Identidade visual: engenharia industrial
   ============================================ */

/* --- Variáveis de cor (edite aqui) --- */
:root {
  --azul-petroleo: #0d2b3d;
  --azul-petroleo-claro: #14425a;
  --azul-petroleo-escuro: #081d29;
  --azul-petroleo-dark: #05131c;
  --branco: #ffffff;
  --cinza-claro: #f4f6f7;
  --cinza: #8a99a3;
  --cinza-medio: #5a6b75;
  --cinza-escuro: #2d3e48;
  --verde: #2e8b7a;
  --verde-claro: #3da896;
  --verde-escuro: #1f6b5e;
  --borda: #e1e6e8;
  --borda-escura: rgba(255,255,255,0.12);

  --font-titulo: "Sora", system-ui, sans-serif;
  --font-corpo: "Inter", system-ui, sans-serif;

  --container: 1200px;
  --radius: 6px;
  --radius-lg: 14px;
  --transicao: 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-corpo);
  font-size: 16px;
  line-height: 1.6;
  color: var(--cinza-escuro);
  background: var(--branco);
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* --- Container --- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* --- Tipografia --- */
h1, h2, h3 { font-family: var(--font-titulo); line-height: 1.2; font-weight: 700; letter-spacing: -0.02em; }

/* --- Botões --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--radius);
  font-family: var(--font-corpo);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: 0.01em;
  transition: all var(--transicao);
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
}
.btn-primary {
  background: var(--verde);
  color: var(--branco);
}
.btn-primary:hover {
  background: var(--verde-escuro);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(46,139,122,0.3);
}
.btn-outline-light {
  border: 1.5px solid rgba(255,255,255,0.5);
  color: var(--branco);
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(4px);
}
.btn-outline-light:hover {
  border-color: var(--branco);
  background: rgba(255,255,255,0.12);
}
.btn-lg { padding: 15px 32px; font-size: 1rem; }

/* --- Cabeçalho --- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background var(--transicao), box-shadow var(--transicao), padding var(--transicao);
  padding: 18px 0;
}
.site-header.scrolled {
  background: rgba(13,43,61,0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.15);
  padding: 12px 0;
}
.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--branco);
}
.logo-mark { display: flex; color: var(--verde-claro); flex-shrink: 0; }
.logo-text {
  font-family: var(--font-titulo);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: 0.02em;
}
.logo-accent { color: var(--verde-claro); font-weight: 600; }

.nav-desktop {
  display: flex;
  gap: 32px;
  margin-left: auto;
  margin-right: 8px;
}
.nav-desktop a {
  color: rgba(255,255,255,0.82);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transicao);
  position: relative;
}
.nav-desktop a::after {
  content: "";
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--verde-claro);
  transition: width var(--transicao);
}
.nav-desktop a:hover { color: var(--branco); }
.nav-desktop a:hover::after { width: 100%; }

.btn-header { margin-left: 0; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 32px; height: 32px;
  align-items: center;
  justify-content: center;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--branco);
  border-radius: 2px;
  transition: all var(--transicao);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Menu mobile */
.nav-mobile {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: var(--azul-petroleo);
  padding: 80px 24px 32px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 99;
  transform: translateY(-100%);
  transition: transform 0.35s cubic-bezier(0.22,0.61,0.36,1);
}
.nav-mobile.open { transform: translateY(0); }
.nav-mobile a {
  color: rgba(255,255,255,0.85);
  font-size: 1.125rem;
  font-weight: 500;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.btn-mobile-cta {
  margin-top: 16px;
  border-bottom: none !important;
  text-align: center;
}

/* --- HERO --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--azul-petroleo-escuro);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url("hero-treatment-plant.jpg") center/cover no-repeat;
  transform: scale(1.05);
  animation: heroZoom 20s ease-out forwards;
}
@keyframes heroZoom { to { transform: scale(1); } }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(125deg,
    rgba(8,29,41,0.92) 0%,
    rgba(8,29,41,0.78) 40%,
    rgba(8,29,41,0.65) 100%
  );
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: linear-gradient(to right, rgba(0,0,0,0.7), transparent 70%);
  -webkit-mask-image: linear-gradient(to right, rgba(0,0,0,0.7), transparent 70%);
}
.hero-content {
  position: relative;
  z-index: 2;
  padding-top: 100px;
  padding-bottom: 60px;
  max-width: 760px;
}
.hero-eyebrow {
  color: var(--verde-claro);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
  opacity: 0;
  animation: fadeUp 0.7s 0.2s forwards;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--branco);
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeUp 0.7s 0.4s forwards;
  line-height: 1.15;
}
.hero-subtitle {
  font-size: clamp(1.0625rem, 2vw, 1.375rem);
  color: rgba(255,255,255,0.82);
  margin-bottom: 36px;
  max-width: 600px;
  line-height: 1.55;
  opacity: 0;
  animation: fadeUp 0.7s 0.6s forwards;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.7s 0.8s forwards;
}
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}
.hero-content > * { transform: translateY(24px); }

.hero-scroll-hint {
  position: absolute;
  bottom: 30px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.hero-scroll-hint span {
  display: block;
  width: 2px; height: 40px;
  background: rgba(255,255,255,0.3);
  position: relative;
  overflow: hidden;
}
.hero-scroll-hint span::after {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 50%;
  background: var(--verde-claro);
  animation: scrollHint 2s infinite;
}
@keyframes scrollHint {
  0% { top: -50%; }
  100% { top: 100%; }
}

/* --- Seções genéricas --- */
.section { padding: 96px 0; }
.section-light { background: var(--cinza-claro); }
.section-dark { background: var(--azul-petroleo); color: rgba(255,255,255,0.85); }
.section-dark-darker { background: var(--azul-petroleo-escuro); color: rgba(255,255,255,0.85); }

.section-header { margin-bottom: 56px; max-width: 720px; }
.section-header-light h2,
.section-header-light .section-label { color: inherit; }
.section-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--verde);
  margin-bottom: 14px;
}
.section-dark .section-label,
.section-dark-darker .section-label { color: var(--verde-claro); }
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  color: var(--azul-petroleo);
  margin-bottom: 16px;
}
.section-dark .section-title,
.section-dark-darker .section-title { color: var(--branco); }
.section-intro {
  font-size: 1.0625rem;
  color: var(--cinza-medio);
  line-height: 1.6;
}
.section-dark .section-intro,
.section-dark-darker .section-intro { color: rgba(255,255,255,0.7); }

/* --- Sobre --- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 72px;
}
.about-text p {
  margin-bottom: 18px;
  font-size: 1.0625rem;
  color: var(--cinza-escuro);
  line-height: 1.7;
}
.about-text strong { color: var(--azul-petroleo); font-weight: 600; }
.about-visual { position: relative; }
.about-visual img {
  border-radius: var(--radius-lg);
  width: 100%;
  height: 420px;
  object-fit: cover;
  box-shadow: 0 12px 40px rgba(13,43,61,0.15);
}
.about-visual-badge {
  position: absolute;
  bottom: -20px; left: -20px;
  background: var(--branco);
  padding: 16px 24px;
  border-radius: var(--radius);
  box-shadow: 0 8px 30px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--azul-petroleo);
}
.badge-line {
  width: 4px; height: 24px;
  background: var(--verde);
  border-radius: 2px;
  flex-shrink: 0;
}

.about-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.pillar {
  background: var(--branco);
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--borda);
  transition: transform var(--transicao), box-shadow var(--transicao);
}
.pillar:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}
.pillar-icon {
  width: 48px; height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(46,139,122,0.1);
  border-radius: var(--radius);
  color: var(--verde);
  margin-bottom: 18px;
}
.pillar h3 {
  font-size: 1.125rem;
  color: var(--azul-petroleo);
  margin-bottom: 8px;
}
.pillar p {
  font-size: 0.9375rem;
  color: var(--cinza-medio);
  line-height: 1.55;
}

/* --- Serviços --- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.service-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--borda-escura);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transicao);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 3px; height: 0;
  background: var(--verde-claro);
  transition: height var(--transicao);
}
.service-card:hover {
  background: rgba(255,255,255,0.08);
  transform: translateY(-4px);
}
.service-card:hover::before { height: 100%; }
.service-number {
  font-family: var(--font-titulo);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--verde-claro);
  letter-spacing: 0.1em;
  margin-bottom: 14px;
}
.service-card h3 {
  font-size: 1.0625rem;
  color: var(--branco);
  margin-bottom: 10px;
  line-height: 1.3;
}
.service-card p {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.55;
  margin-bottom: 16px;
}
.service-deliverables {
  border-top: 1px solid var(--borda-escura);
  padding-top: 14px;
}
.service-deliverables li {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.55);
  padding: 4px 0;
  padding-left: 18px;
  position: relative;
  line-height: 1.5;
}
.service-deliverables li::before {
  content: "";
  position: absolute;
  left: 0; top: 11px;
  width: 8px; height: 1px;
  background: var(--verde-claro);
}
.services-note {
  text-align: center;
  margin-top: 40px;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
  font-style: italic;
}

/* --- Metodologia --- */
.method-timeline {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-bottom: 24px;
  position: relative;
}
.method-step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 12px;
}
.method-marker {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--branco);
  border: 2px solid var(--verde);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  position: relative;
  z-index: 2;
  transition: all var(--transicao);
  flex-shrink: 0;
}
.method-step:hover .method-marker {
  background: var(--verde);
  transform: scale(1.08);
}
.method-num {
  font-family: var(--font-titulo);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--verde);
  transition: color var(--transicao);
}
.method-step:hover .method-num { color: var(--branco); }
.method-content h3 {
  font-size: 1rem;
  color: var(--azul-petroleo);
  margin-bottom: 6px;
}
.method-content p {
  font-size: 0.875rem;
  color: var(--cinza-medio);
  line-height: 1.5;
}
.method-connector {
  flex: 0 0 40px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  margin-top: 0;
}
.method-connector::before {
  content: "";
  width: 100%;
  height: 2px;
  background: repeating-linear-gradient(90deg,
    var(--verde) 0, var(--verde) 6px,
    transparent 6px, transparent 12px
  );
  margin-top: -38px;
}
.method-note {
  text-align: center;
  font-size: 0.875rem;
  color: var(--cinza-medio);
  font-style: italic;
  margin-bottom: 64px;
}
.method-images {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.method-images figure { position: relative; }
.method-images img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  transition: transform 0.4s ease;
}
.method-images figure:hover img { transform: scale(1.03); }
.method-images figcaption {
  margin-top: 10px;
  font-size: 0.8125rem;
  color: var(--cinza-medio);
  text-align: center;
  font-weight: 500;
}

/* --- Desafios --- */
.challenges-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.challenge-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--borda-escura);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transicao);
}
.challenge-card:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(61,168,150,0.4);
  transform: translateY(-3px);
}
.challenge-icon {
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--verde-claro);
  margin-bottom: 18px;
  opacity: 0.85;
}
.challenge-card h3 {
  font-size: 1.0625rem;
  color: var(--branco);
  margin-bottom: 10px;
  line-height: 1.3;
}
.challenge-card p {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.55;
}

/* --- Contato --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: center;
}
.contact-info .section-label { margin-bottom: 14px; }
.contact-info .section-title { margin-bottom: 14px; }
.contact-lead {
  font-size: 1.0625rem;
  color: var(--cinza-medio);
  margin-bottom: 36px;
  line-height: 1.6;
}
.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
}
.contact-method {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  background: var(--branco);
  border: 1px solid var(--borda);
  border-radius: var(--radius);
  transition: all var(--transicao);
}
.contact-method:hover {
  border-color: var(--verde);
  box-shadow: 0 4px 16px rgba(46,139,122,0.1);
  transform: translateX(4px);
}
.contact-method-icon {
  width: 44px; height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(46,139,122,0.1);
  border-radius: var(--radius);
  color: var(--verde);
}
.contact-method-text { display: flex; flex-direction: column; }
.contact-method-text strong {
  font-size: 0.9375rem;
  color: var(--azul-petroleo);
  font-weight: 600;
}
.contact-method-text span {
  font-size: 0.875rem;
  color: var(--cinza-medio);
}
.contact-cta-box {
  padding: 20px 24px;
  background: rgba(46,139,122,0.06);
  border-left: 3px solid var(--verde);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.contact-cta-box p {
  font-size: 0.9375rem;
  color: var(--cinza-medio);
  line-height: 1.55;
}
.contact-visual { position: relative; }
.contact-visual img {
  border-radius: var(--radius-lg);
  width: 100%;
  height: 520px;
  object-fit: cover;
  box-shadow: 0 12px 40px rgba(13,43,61,0.15);
}
.contact-visual-accent {
  position: absolute;
  top: -12px; right: -12px;
  width: 120px; height: 120px;
  border: 2px solid var(--verde);
  border-radius: var(--radius-lg);
  z-index: -1;
  opacity: 0.5;
}

/* --- Rodapé --- */
.site-footer {
  background: var(--azul-petroleo-dark);
  color: rgba(255,255,255,0.6);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}
.logo-footer { margin-bottom: 16px; }
.footer-desc {
  font-size: 0.9375rem;
  line-height: 1.6;
  max-width: 360px;
}
.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-nav a {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transicao);
}
.footer-nav a:hover { color: var(--verde-claro); }
.footer-contact-label {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--verde-claro);
  margin-bottom: 12px;
}
.footer-contact a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 8px;
  transition: color var(--transicao);
}
.footer-contact a:hover { color: var(--verde-claro); }
.footer-whatsapp, .footer-linkedin { display: inline-flex !important; align-items: center; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-bottom p { font-size: 0.8125rem; color: rgba(255,255,255,0.4); }
.footer-note { font-style: italic; }

/* --- Animações de scroll --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .hero-bg { animation: none; transform: none; }
  .hero-content > * { opacity: 1; transform: none; }
  .reveal { opacity: 1; transform: none; }
}

/* --- Foco acessível --- */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--verde-claro);
  outline-offset: 3px;
  border-radius: 3px;
}

/* --- Responsivo --- */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .about-pillars { grid-template-columns: repeat(3, 1fr); }
  .method-images { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 860px) {
  .nav-desktop, .btn-header { display: none; }
  .nav-toggle { display: flex; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-visual img { height: 320px; }
  .about-visual-badge { left: 0; bottom: -16px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .contact-visual img { height: 360px; }
  .contact-visual-accent { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .method-timeline { flex-direction: column; gap: 0; }
  .method-step { flex-direction: row; text-align: left; align-items: flex-start; padding: 16px 0; width: 100%; }
  .method-marker { margin-bottom: 0; margin-right: 20px; }
  .method-content h3 { margin-bottom: 4px; }
  .method-connector {
    flex: 0 0 auto;
    width: 56px; height: 24px;
    align-items: flex-start;
  }
  .method-connector::before {
    width: 2px; height: 100%;
    background: repeating-linear-gradient(180deg,
      var(--verde) 0, var(--verde) 6px,
      transparent 6px, transparent 12px
    );
    margin-top: 0;
  }
  .method-images { grid-template-columns: 1fr; }
  .method-images img { height: 220px; }
}

@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .container { padding: 0 20px; }
  .header-inner { padding: 0 20px; }
  .services-grid { grid-template-columns: 1fr; }
  .about-pillars { grid-template-columns: 1fr; }
  .challenges-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .hero-content { padding-top: 120px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .pillar, .service-card, .challenge-card { padding: 24px; }
}

@media (max-width: 420px) {
  .hero-title { font-size: 1.75rem; }
  .hero-subtitle { font-size: 1rem; }
  .section-title { font-size: 1.5rem; }
  .about-visual-badge { font-size: 0.75rem; padding: 12px 16px; }
}