/* ============================================================
   EcoModelAI — Website de divulgação · Turtle Brain
   Folha de estilos partilhada
   ============================================================ */

:root {
  --eco-50: #f0fdf5;
  --eco-100: #dcfce8;
  --eco-200: #bbf7d1;
  --eco-300: #86efad;
  --eco-500: #22c55e;
  --eco-600: #16a34a;
  --eco-700: #15803c;
  --eco-800: #166533;
  --ocean-400: #22d3ee;
  --ocean-500: #06b6d4;
  --ocean-600: #0891b2;
  --ocean-700: #0e7490;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --ink: #0b1f17;
  --bg: #f7faf8;

  --radius-lg: 24px;
  --radius-md: 16px;
  --shadow-soft: 0 2px 20px -4px rgba(16, 80, 50, 0.12);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px -12px rgba(16, 80, 50, 0.18);
  --maxw: 1180px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    radial-gradient(60rem 60rem at 90% -10%, rgba(34, 197, 94, 0.08), transparent),
    radial-gradient(50rem 50rem at -10% 10%, rgba(6, 182, 212, 0.07), transparent);
  background-attachment: fixed;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Tipografia utilitária ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--eco-200);
  background: var(--eco-50);
  color: var(--eco-700);
  padding: 0.3rem 0.85rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.gradient-text {
  background: linear-gradient(90deg, var(--eco-600), var(--ocean-500));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
h1, h2, h3 { color: var(--slate-900); letter-spacing: -0.02em; line-height: 1.12; }
.section-title { font-size: clamp(1.6rem, 3vw, 2.3rem); font-weight: 800; margin: 0.6rem 0 0; }
.section-lead { color: var(--slate-600); font-size: 1.05rem; max-width: 46rem; margin: 0.9rem auto 0; }
.text-center { text-align: center; }

/* ---------- Botões ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 12px;
  padding: 0.72rem 1.35rem;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.18s ease;
}
.btn-primary {
  background: var(--eco-600);
  color: #fff;
  box-shadow: var(--shadow-soft);
}
.btn-primary:hover { background: var(--eco-700); transform: translateY(-1px); }
.btn-ghost {
  background: #fff;
  border-color: var(--eco-200);
  color: var(--eco-800);
}
.btn-ghost:hover { background: var(--eco-50); }

/* ---------- Navegação ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.nav.scrolled { border-bottom-color: var(--eco-100); }
.nav-inner {
  height: 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: inline-flex; align-items: center; gap: 0.6rem; }
.brand-name { font-size: 1.18rem; font-weight: 800; color: var(--slate-900); letter-spacing: -0.02em; }
.brand-name .m { color: var(--eco-600); }
.nav-links { display: flex; align-items: center; gap: 0.25rem; }
.nav-links a {
  padding: 0.5rem 0.85rem;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--slate-600);
  transition: background 0.15s, color 0.15s;
}
.nav-links a:hover { background: var(--eco-50); color: var(--eco-700); }
.nav-links a.active { color: var(--eco-700); background: var(--eco-50); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.4rem; color: var(--slate-700); }
.nav-mobile { display: none; border-top: 1px solid var(--eco-100); background: #fff; padding: 0.5rem 1.5rem 1rem; }
.nav-mobile a { display: block; padding: 0.7rem 0.5rem; font-weight: 600; color: var(--slate-700); border-radius: 8px; }
.nav-mobile a:hover { background: var(--eco-50); }

/* ---------- Hero ---------- */
.hero { padding: 8.5rem 0 4rem; position: relative; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 3.5rem; align-items: center; }
.hero h1 { font-size: clamp(2.3rem, 5vw, 3.7rem); font-weight: 800; margin: 1.2rem 0 0; }
.hero p.lead { font-size: 1.15rem; color: var(--slate-600); margin-top: 1.4rem; max-width: 34rem; }
.hero-actions { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.8rem; }
.hero-stats { margin-top: 2.6rem; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; max-width: 32rem; }
.hero-stats .k { font-size: 0.72rem; color: var(--eco-600); font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; }
.hero-stats .v { font-size: 1.7rem; font-weight: 800; color: var(--slate-900); margin-top: 0.15rem; }
.hero-stats .s { font-size: 0.75rem; color: var(--slate-500); }

.hero-visual { position: relative; }
.hero-visual .glow {
  position: absolute; inset: -1.5rem; z-index: 0;
  background: linear-gradient(135deg, rgba(187, 247, 209, 0.5), rgba(165, 243, 252, 0.5));
  filter: blur(40px); border-radius: 2.5rem;
}

/* ---------- Cartões ---------- */
.card {
  position: relative;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--eco-100);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(6px);
  padding: 1.75rem;
}
.section { padding: 4.5rem 0; }
.section.tinted { background: linear-gradient(to bottom, #fff, rgba(240, 253, 245, 0.5)); border-top: 1px solid var(--eco-100); }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; margin-top: 2.8rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.1rem; margin-top: 2.8rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem; }

.pillar .icon {
  width: 3rem; height: 3rem; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--eco-500), var(--ocean-500));
  color: #fff; box-shadow: var(--shadow-soft);
}
.pillar .num { font-size: 0.72rem; font-weight: 800; color: var(--eco-600); margin-top: 0.9rem; }
.pillar h3 { font-size: 1.2rem; margin: 0.25rem 0 0; }
.pillar p { color: var(--slate-600); font-size: 0.95rem; margin: 0.6rem 0 0; }
.pillar ul { list-style: none; margin: 1.1rem 0 0; padding: 1.1rem 0 0; border-top: 1px solid var(--eco-100); }
.pillar li { display: flex; gap: 0.55rem; align-items: flex-start; color: var(--slate-600); font-size: 0.9rem; padding: 0.28rem 0; }
.pillar li::before { content: ''; width: 6px; height: 6px; border-radius: 999px; background: var(--eco-500); margin-top: 0.55rem; flex: 0 0 auto; }

/* ---------- Passos / metodologia ---------- */
.step .icon {
  width: 2.75rem; height: 2.75rem; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: var(--eco-100); color: var(--eco-700);
}
.step h3 { font-size: 1.02rem; margin: 1rem 0 0; }
.step p { color: var(--slate-600); font-size: 0.9rem; margin-top: 0.4rem; }

/* ---------- Estatísticas / destaque ---------- */
.stat-box { background: rgba(240, 253, 245, 0.6); border-radius: var(--radius-md); padding: 1.1rem; }
.stat-box .v { font-size: 1.6rem; font-weight: 800; color: var(--eco-600); }
.stat-box .k { font-size: 0.78rem; color: var(--slate-600); margin-top: 0.3rem; line-height: 1.4; }

.note {
  margin: 2.5rem auto 0; max-width: 48rem;
  border: 1px solid #fde68a; background: #fffbeb; color: #92400e;
  border-radius: var(--radius-md); padding: 1rem 1.25rem; font-size: 0.9rem; text-align: center;
}

/* Lista de features com check */
.feature-list { list-style: none; margin: 1.5rem 0 0; padding: 0; display: grid; gap: 0.85rem; }
.feature-list li { display: flex; gap: 0.7rem; align-items: flex-start; color: var(--slate-700); }
.feature-list .check {
  flex: 0 0 auto; width: 1.4rem; height: 1.4rem; border-radius: 999px;
  background: var(--eco-100); color: var(--eco-700);
  display: flex; align-items: center; justify-content: center;
}

/* ---------- Faixa CTA ---------- */
.cta-band {
  margin: 0 auto; max-width: var(--maxw);
  background: linear-gradient(135deg, var(--eco-600), var(--ocean-600));
  border-radius: 28px; padding: 3rem 2.5rem; color: #fff; text-align: center;
}
.cta-band h2 { color: #fff; font-size: clamp(1.5rem, 3vw, 2.1rem); }
.cta-band p { color: rgba(255, 255, 255, 0.9); max-width: 40rem; margin: 0.8rem auto 1.6rem; }
.cta-band .btn-white { background: #fff; color: var(--eco-700); }
.cta-band .btn-white:hover { background: var(--eco-50); }

/* ---------- FAQ (acordeão) ---------- */
.faq-list { max-width: 760px; margin: 2.5rem auto 0; display: grid; gap: 0.9rem; }
.faq-item {
  border: 1px solid var(--eco-100);
  background: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.35rem;
  font-weight: 700;
  color: var(--slate-800);
  font-size: 1.02rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .plus {
  flex: 0 0 auto;
  width: 1.6rem; height: 1.6rem;
  border-radius: 999px;
  background: var(--eco-100); color: var(--eco-700);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; font-weight: 700; line-height: 1;
  transition: transform 0.2s ease, background 0.2s ease;
}
.faq-item[open] summary .plus { transform: rotate(45deg); background: var(--eco-600); color: #fff; }
.faq-item summary:hover { color: var(--eco-700); }
.faq-answer { padding: 0 1.35rem 1.25rem; color: var(--slate-600); font-size: 0.96rem; }
.faq-answer p { margin: 0; }
.faq-cta { text-align: center; margin-top: 2.5rem; color: var(--slate-600); }

/* ---------- Formulário de contacto ---------- */
.form-wrap { max-width: 640px; margin: 2.5rem auto 0; }
.field { margin-bottom: 1.15rem; }
.field label { display: block; font-size: 0.82rem; font-weight: 700; color: var(--slate-700); margin-bottom: 0.4rem; }
.field input, .field textarea, .field select {
  width: 100%; padding: 0.8rem 0.95rem;
  border: 1px solid var(--eco-200); border-radius: 12px;
  font-family: inherit; font-size: 0.95rem; color: var(--ink);
  background: #fff; transition: border-color 0.15s, box-shadow 0.15s;
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--eco-500);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
}
.field textarea { resize: vertical; min-height: 140px; }
.form-note { font-size: 0.8rem; color: var(--slate-500); margin-top: 0.4rem; }
.form-success {
  display: none; align-items: center; gap: 0.7rem;
  background: var(--eco-50); border: 1px solid var(--eco-200); color: var(--eco-800);
  border-radius: 12px; padding: 1rem 1.15rem; font-size: 0.92rem; margin-bottom: 1.25rem;
}
.form-success.show { display: flex; }

/* ---------- Rodapé ---------- */
.site-footer { border-top: 1px solid var(--eco-100); background: rgba(255, 255, 255, 0.6); margin-top: 3rem; }
.footer-top {
  display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
  padding: 2rem 0; flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 0.6rem; }
.footer-brand .name { font-weight: 800; color: var(--slate-700); }
.footer-brand .name .m { color: var(--eco-600); }
.footer-tag { font-size: 0.78rem; color: var(--slate-500); text-align: right; }
.footer-nav { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.footer-nav a { font-size: 0.85rem; color: var(--slate-600); font-weight: 600; }
.footer-nav a:hover { color: var(--eco-700); }

/* Faixa PRR (fundo escuro para logos brancos) */
.prr-band { background: var(--slate-900); }
.prr-inner { padding: 2.25rem 1.5rem; }
.prr-title { text-align: center; color: var(--slate-400); font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 1.5rem; }
.prr-logos {
  display: flex; align-items: center; justify-content: center;
  gap: 2.5rem; flex-wrap: wrap;
}
.prr-logos a { display: inline-flex; align-items: center; opacity: 0.95; transition: opacity 0.2s, transform 0.2s; }
.prr-logos a:hover { opacity: 1; transform: translateY(-2px); }
.prr-logos img { height: 46px; width: auto; }
.prr-logos img.tall { height: 58px; }
.prr-copyright { text-align: center; color: var(--slate-500); font-size: 0.72rem; padding: 0 1.5rem 1.75rem; }

/* ---------- Responsivo ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-visual { order: -1; }
  .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-links, .footer-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-mobile.open { display: block; }
  .grid-3, .grid-4, .hero-stats { grid-template-columns: 1fr; }
  .hero-stats { gap: 1.2rem; }
  .footer-top { justify-content: center; text-align: center; }
  .footer-tag { text-align: center; }
  .prr-logos { gap: 1.75rem; }
  .prr-logos img { height: 38px; }
  .prr-logos img.tall { height: 48px; }
}