/* 3B Escolas: mesma identidade do Instagram (01_BRAND/IDENTIDADE_VISUAL.md)
   Mobile first: o estilo base é o do celular (a partir de 320 px); tablet e computador
   entram por min-width. Alvos de toque de no mínimo 48 px, textos fluidos com clamp,
   respeito às áreas seguras (entalhe e barra de gestos) e nenhuma rolagem lateral. */
:root {
  --grafite: #111111;
  --branco: #ffffff;
  --nevoa: #F3F5F5;
  --ciano: #38C9D8;
  --petroleo: #0E5A6B;
  --ambar: #F2B705;
  --zap: #1FAF5A;
  --zap-escuro: #178A47;
  --cinza-texto: #3c4a4d;
  --raio: 16px;
  --sombra: 0 8px 24px rgba(14, 90, 107, .12);
  --margem: clamp(16px, 5vw, 32px);
  --barra-zap: 64px;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0; overflow-x: hidden;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(16px, 4.2vw, 18px); line-height: 1.55;
  color: var(--grafite); background: var(--branco);
  -webkit-font-smoothing: antialiased;
  /* espaço para a barra fixa do WhatsApp no celular */
  padding-bottom: calc(var(--barra-zap) + env(safe-area-inset-bottom));
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--petroleo); -webkit-tap-highlight-color: rgba(56, 201, 216, .25); }
.conteudo { width: 100%; max-width: 1140px; margin-inline: auto; padding-inline: max(var(--margem), env(safe-area-inset-left)) max(var(--margem), env(safe-area-inset-right)); }
.estreito { max-width: 820px; }

h1, h2, h3 { font-family: "Arial Narrow", "Roboto Condensed", "Helvetica Neue", Arial, sans-serif; font-weight: 700; color: var(--petroleo); line-height: 1.08; margin: 0 0 .5em; overflow-wrap: break-word; }
h1 { font-size: clamp(2.3rem, 11vw, 4.4rem); letter-spacing: -.01em; }
h1 span { color: var(--grafite); display: block; }
h2 { font-size: clamp(1.7rem, 7.5vw, 2.8rem); }
h3 { font-size: clamp(1.25rem, 5.2vw, 1.45rem); }
p { margin: 0 0 1em; }

/* Topo */
.topo { position: sticky; top: 0; z-index: 20; background: rgba(243, 245, 245, .97); border-bottom: 1px solid #e2e8e9; padding-top: env(safe-area-inset-top); }
@supports (backdrop-filter: blur(6px)) { .topo { background: rgba(243, 245, 245, .88); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); } }
.faixa { height: 5px; background: var(--ciano); }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 60px; }
.marca { display: flex; align-items: center; min-height: 48px; }
.marca img { width: clamp(118px, 34vw, 170px); }
.menu { display: none; }

/* Botões */
.botao {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 12px 22px; border-radius: 999px;
  font-weight: 700; font-size: 1rem; text-decoration: none; text-align: center;
  touch-action: manipulation; transition: transform .15s ease, background-color .15s ease;
}
.botao svg { width: 22px; height: 22px; fill: currentColor; flex: none; }
.botao-zap { background: var(--zap); color: var(--branco); }
.botao-zap:active { background: var(--zap-escuro); transform: scale(.98); }
.botao-contorno { border: 2px solid var(--petroleo); color: var(--petroleo); background: transparent; }
.botao.pequeno { min-height: 44px; padding: 8px 16px; font-size: .92rem; }
.botao.grande { font-size: 1.1rem; padding: 16px 28px; }
.nav .botao.pequeno { display: none; }

/* Herói */
.heroi { background: var(--nevoa); padding: 28px 0 36px; }
.heroi-grade { display: flex; flex-direction: column; gap: 24px; }
.selo { display: inline-block; background: var(--petroleo); color: var(--branco); font-weight: 600; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; padding: 6px 12px; border-radius: 10px; margin-bottom: 14px; }
.lead { font-size: clamp(1.05rem, 4.6vw, 1.25rem); color: var(--cinza-texto); }
.acoes { display: flex; flex-direction: column; gap: 12px; margin: 22px 0; }
.acoes .botao { width: 100%; }
.provas { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.provas li { padding-left: 28px; position: relative; color: var(--cinza-texto); font-size: .95rem; }
.provas li::before { content: ""; position: absolute; left: 0; top: .3em; width: 16px; height: 16px; border-radius: 50%; background: var(--ciano); box-shadow: inset 0 0 0 4px var(--nevoa); }
.heroi-imagem img { border-radius: 20px; box-shadow: var(--sombra); aspect-ratio: 4 / 3; object-fit: cover; width: 100%; }

/* Seções */
.secao { padding: 52px 0; }
.secao-clara { background: var(--nevoa); }
.sobretitulo { color: var(--petroleo); font-weight: 700; text-transform: uppercase; letter-spacing: .06em; font-size: .8rem; margin: 0 0 8px; }
.intro { font-size: clamp(1rem, 4.2vw, 1.15rem); color: var(--cinza-texto); max-width: 60ch; margin-bottom: 24px; }

.cards { display: grid; grid-template-columns: 1fr; gap: 18px; }
.card { background: var(--branco); border-radius: var(--raio); overflow: hidden; box-shadow: var(--sombra); border-top: 5px solid var(--ciano); display: flex; flex-direction: column; }
.card img { aspect-ratio: 16 / 10; object-fit: cover; width: 100%; }
.card-corpo { padding: 18px; }
.card-corpo p { color: var(--cinza-texto); margin: 0 0 12px; }
.card-destaque { background: var(--petroleo); border-top-color: var(--ambar); justify-content: center; }
.card-destaque h3, .card-destaque p { color: var(--branco); }
.card-destaque .botao { width: 100%; }

.passos { list-style: none; counter-reset: passo; padding: 0; margin: 24px 0 0; display: grid; grid-template-columns: 1fr; gap: 14px; }
.passos li { counter-increment: passo; background: var(--branco); border-radius: var(--raio); padding: 18px 18px 18px 72px; box-shadow: var(--sombra); position: relative; }
.passos li::before { content: counter(passo); position: absolute; left: 18px; top: 18px; display: grid; place-items: center; width: 38px; height: 38px; border-radius: 12px; background: var(--petroleo); color: var(--branco); font-weight: 700; }
.passos strong { display: block; font-size: 1.05rem; color: var(--petroleo); margin-bottom: 4px; }
.passos span { color: var(--cinza-texto); }

.duas-colunas { display: grid; grid-template-columns: 1fr; gap: 36px; }
.lista-check { list-style: none; padding: 0; margin: 0 0 16px; display: grid; gap: 12px; }
.lista-check li { padding-left: 34px; position: relative; }
.lista-check li::before { content: "✓"; position: absolute; left: 0; top: 1px; width: 24px; height: 24px; border-radius: 7px; background: var(--ciano); color: var(--grafite); font-weight: 800; display: grid; place-items: center; font-size: .85rem; }
.nota { font-size: .9rem; color: var(--cinza-texto); border-left: 4px solid var(--ambar); padding-left: 12px; }
.rostos { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; margin: 12px 0 18px; }
.rostos figure { margin: 0; text-align: center; min-width: 0; }
.rostos img { border-radius: 50%; aspect-ratio: 1; object-fit: cover; border: 3px solid var(--ciano); width: 100%; }
.rostos figcaption { font-weight: 700; font-size: .78rem; margin-top: 6px; line-height: 1.2; }
.rostos small { display: block; font-weight: 400; color: var(--cinza-texto); font-size: .68rem; }
.link-insta { display: inline-flex; align-items: center; min-height: 48px; font-weight: 700; }

details { background: var(--branco); border-radius: 12px; margin-bottom: 10px; box-shadow: 0 4px 14px rgba(14, 90, 107, .08); }
summary { cursor: pointer; font-weight: 700; color: var(--petroleo); font-size: 1rem; min-height: 56px; padding: 14px 44px 14px 18px; display: flex; align-items: center; position: relative; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 18px; font-size: 1.5rem; line-height: 1; color: var(--ciano); }
details[open] summary::after { content: "−"; }
details p { margin: 0; padding: 0 18px 18px; color: var(--cinza-texto); }

.chamada-final { background: var(--petroleo); color: var(--branco); padding: 52px 0; text-align: center; border-top: 8px solid var(--ciano); }
.chamada-final h2 { color: var(--branco); }
.chamada-final p { font-size: clamp(1rem, 4.4vw, 1.2rem); }
.chamada-final .botao { width: 100%; max-width: 420px; }
.telefone { font-weight: 700; letter-spacing: .03em; margin-top: 14px; }
.telefone a { color: var(--branco); display: inline-flex; align-items: center; min-height: 48px; padding: 0 12px; }

.rodape { background: var(--grafite); color: #c9d3d5; padding: 36px 0; font-size: .92rem; }
.rodape a { color: var(--ciano); display: inline-flex; align-items: center; min-height: 48px; }
.rodape-grade { display: grid; grid-template-columns: 1fr; gap: 16px; }
.rodape img { width: 150px; }

/* Barra fixa de WhatsApp no celular: sempre ao alcance do polegar */
.zap-flutuante {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  min-height: var(--barra-zap); padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  background: var(--zap); color: var(--branco); font-weight: 700; font-size: 1.05rem; text-decoration: none;
  box-shadow: 0 -6px 20px rgba(0, 0, 0, .15);
}
.zap-flutuante svg { width: 26px; height: 26px; fill: var(--branco); flex: none; }

/* Telas muito pequenas (320 px, celulares antigos e compactos) */
@media (max-width: 359px) {
  .rostos { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .botao { padding-inline: 16px; }
}

/* Celular grande e dobrável aberto */
@media (min-width: 480px) {
  .acoes { flex-direction: row; flex-wrap: wrap; }
  .acoes .botao { width: auto; }
  .nav .botao.pequeno { display: inline-flex; }
}

/* Tablet em pé */
@media (min-width: 640px) {
  .cards { grid-template-columns: 1fr 1fr; }
  .passos { grid-template-columns: 1fr 1fr; }
  .card-destaque .botao { width: auto; }
  .rodape-grade { grid-template-columns: auto 1fr; align-items: center; }
}

/* Tablet deitado e computador */
@media (min-width: 900px) {
  body { padding-bottom: 0; }
  html { scroll-padding-top: 90px; }
  .menu { display: flex; list-style: none; gap: 22px; margin: 0 0 0 auto; padding: 0; }
  .menu a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; color: var(--grafite); font-weight: 600; font-size: .95rem; }
  .menu a:hover { color: var(--petroleo); }
  .nav { min-height: 72px; gap: 24px; }
  .heroi { padding: 64px 0 72px; }
  .heroi-grade { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
  .heroi-imagem img { aspect-ratio: 1 / .9; border-radius: 28px; }
  .secao { padding: 84px 0; }
  .cards { grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .passos { grid-template-columns: repeat(4, 1fr); }
  .passos li { padding: 24px 22px; }
  .passos li::before { position: static; margin-bottom: 14px; }
  .duas-colunas { grid-template-columns: 1fr 1fr; gap: 56px; }
  .rostos figcaption { font-size: .9rem; }
  .rostos small { font-size: .75rem; }
  .rodape-grade { grid-template-columns: auto 1fr auto; }
  .botao:hover { transform: translateY(-2px); }
  /* no computador, a barra vira um botão redondo no canto */
  .zap-flutuante { left: auto; right: 22px; bottom: 22px; width: 62px; min-height: 62px; height: 62px; padding: 0; border-radius: 50%; }
  .zap-flutuante span { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .botao { transition: none; }
}