:root {
  --black: #090909;
  --dark: #151515;
  --yellow: #f6c200;
  --white: #ffffff;
  --muted: #6d7280;
  --line: #eceef2;
  --soft: #f6f7f9;
}

/* Reset */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background: #f5f6f8;
  color: #161616;
}

.container {
  width: min(1200px, 92%);
  margin: auto;
}

/* Topbar */
.topbar {
  background: #111;
  color: #fff;
  font-size: 13px;
}

.topbar__content {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  padding: 9px 0;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #000;
  border-bottom: 2px solid var(--yellow);
}

.nav {
  height: 78px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: flex;
  background: #050505;
  border-radius: 14px;
  padding: 10px 16px;
}

.brand img {
  height: 38px;
  width: auto;
}

/* Menu */
.menu {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.menu a,
.dropdown button {
  border: 0;
  background: transparent;
  color: #fff;
  text-decoration: none;
  padding: 12px 13px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: 0.25s;
}

.menu a:hover,
.dropdown button:hover {
  background: var(--yellow);
  color: #000;
}

.dropdown {
  position: relative;
}

.dropdown__list {
  position: absolute;
  top: 48px;
  left: 0;
  min-width: 230px;
  display: none;
  padding: 12px;
  background: #111;
  border: 1px solid #333;
  border-radius: 18px;
  box-shadow: 0 20px 60px #0005;
}

.menu-btn {
    display: none;
}

@media (max-width: 980px) {

    .menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        margin-left: auto;
        width: 48px;
        height: 48px;
        border: 0;
        border-radius: 10px;
        background: var(--yellow);
        color: #000;
        font-size: 22px;
        font-weight: bold;
        cursor: pointer;
    }

    .nav > .btn {
        display: none;
    }

    .menu {
        position: fixed;
        top: 0;
        right: -320px;
        width: 320px;
        height: 100vh;
        background: #000;
        padding: 90px 25px 30px;
        display: flex;
        flex-direction: column;
        gap: 5px;
        transition: .35s ease;
        z-index: 9999;
        overflow-y: auto;
    }

    .menu.open {
        right: 0;
    }

    .menu a {
        color: #fff;
        padding: 14px 0;
        border-bottom: 1px solid #222;
        text-decoration: none;
    }

    .mobile-dropdown-btn {
        width: 100%;
        background: none;
        border: none;
        color: #fff;
        font-size: 15px;
        font-weight: 600;
        text-align: left;
        padding: 14px 0;
        display: flex;
        justify-content: space-between;
        cursor: pointer;
    }

    .mobile-dropdown-content {
        display: none;
        padding-left: 15px;
    }

    .mobile-dropdown.active .mobile-dropdown-content {
        display: block;
    }

    .mobile-dropdown-content a {
        display: block;
        padding: 10px 0;
        color: #ccc;
        border: none;
    }

    .mobile-whats {
        margin-top: 20px;
        text-align: center;
    }

    .menu-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,.6);
        backdrop-filter: blur(4px);
        z-index: 9998;
        display: none;
    }

    .menu-overlay.show {
        display: block;
    }
}

.dropdown:hover .dropdown__list {
  display: grid;
}

.dropdown__list a {
  color: #fff;
  border-radius: 12px;
}

.dropdown__list a:hover {
  background: var(--yellow);
  color: #000;
}

/* Botões */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 13px 20px;
  font-weight: 800;
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn--yellow {
  background: var(--yellow);
  color: #111;
  box-shadow: 0 10px 25px #f6c20045;
}

.btn--light {
  background: #fff;
  color: #111;
}

.btn--dark {
  background: #111;
  color: #fff;
}

.btn--outline {
  border-color: #ddd;
  color: #111;
  background: #fff;
}

.menu-btn {
  display: none;
}

/* Hero */
.hero {
  padding: 34px 0 18px;
  background: #fff;
}

.hero__banner {
  height: 400px;
  border-radius: 30px;
  overflow: hidden;
  position: relative;
  background: #000;
  box-shadow: 0 30px 80px #0003;
}

.hero__banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  max-width: 690px;
  padding: 54px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: #fff;
  background: linear-gradient(90deg, #000d, #0008 45%, #0001);
}

.hero h1 {
  font-size: 44px;
  line-height: 1.02;
  margin: 18px 0 14px;
}

.hero p {
  font-size: 18px;
  line-height: 1.6;
  color: #eee;
  margin: 0 0 24px;
}

.hero__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* Tags */
.tag,
.eyebrow {
  display: inline-flex;
  width: max-content;
  background: #fff3bd;
  color: #6b5200;
  border: 1px solid #ffe37a;
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Informações rápidas */
.quick-info {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 8px;
}

.quick-info article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px;
  box-shadow: 0 12px 35px #0000000d;
}

.quick-info strong {
  display: block;
  margin-bottom: 6px;
}

.quick-info span {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}

/* Seções */
.section {
  background: #fff;
  border-radius: 34px;
  margin-top: 26px;
  padding: 36px;
  border: 1px solid var(--line);
  box-shadow: 0 20px 70px #0000000c;
}

.section__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 26px;
}

.section h2,
.about h2,
.cta-strip h2 {
  font-size: 34px;
  margin: 12px 0 0;
}

/* Filtros */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.filter {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 10px 14px;
  font-weight: 800;
  cursor: pointer;
}

.filter.active {
  background: #111;
  color: #fff;
  border-color: #111;
}

/* Produtos */
.products {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #fff;
  overflow: hidden;
  transition: 0.25s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 22px 55px #0002;
}

.card__img {
  height: 185px;
  background: #f7f7f7;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
}

.card__img img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.card__body {
  padding: 18px;
}

.badge {
  display: inline-flex;
  background: #f7f0d4;
  color: #6c5300;
  font-weight: 800;
  font-size: 12px;
  border-radius: 999px;
  padding: 7px 10px;
}

.card h3 {
  font-size: 17px;
  margin: 12px 0 16px;
  min-height: 42px;
}

.card__actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: auto;
}

.card__actions a {
  font-size: 13px;
  padding: 11px 10px;
}

/* Chamada */
.cta-strip {
  margin-top: 26px;
  background: #111;
  color: #fff;
  border-radius: 30px;
  padding: 34px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  overflow: hidden;
  position: relative;
}

.cta-strip::after {
  content: "";
  position: absolute;
  right: -70px;
  top: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: var(--yellow);
  opacity: 0.18;
}

.cta-strip p {
  color: #d9d9d9;
  max-width: 680px;
  line-height: 1.6;
}

/* Sobre */
.about {
  margin-top: 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 34px;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 34px;
  padding: 34px;
  box-shadow: 0 20px 70px #0000000c;
}

.about__image img {
  width: 100%;
  height: 100%;
  min-height: 440px;
  object-fit: cover;
  border-radius: 26px;
}

.about__text p {
  line-height: 1.75;
  color: #4d535f;
}

/* Valores */
.values-grid {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.values-grid article {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 18px;
}

.values-grid h3 {
  margin: 0 0 6px;
}

.values-grid p {
  margin: 0;
}

/* Rodapé */
.footer {
  margin-top: 34px;
  background: #050505;
  color: #fff;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 36px;
  padding: 46px 0;
}

.footer__logo {
  height: 40px;
  background: #000;
  border-radius: 10px;
}

.footer p {
  color: #bfc3cc;
  line-height: 1.6;
}

.footer h4 {
  margin: 0 0 12px;
}

.footer a {
  display: block;
  color: #bfc3cc;
  text-decoration: none;
  margin: 9px 0;
}

.footer a:hover {
  color: var(--yellow);
}

.footer__bottom {
  text-align: center;
  color: #aaa;
  border-top: 1px solid #222;
  padding: 18px;
}

/* WhatsApp */
.float-whats {
  position: fixed;
  right: 20px;
  bottom: 20px;
  background: #25d366;
  color: #fff;
  text-decoration: none;
  font-weight: 900;
  padding: 15px 20px;
  border-radius: 999px;
  box-shadow: 0 18px 40px #0004;
  z-index: 30;
}

/* Responsivo */
@media (max-width: 980px) {
  .menu {
    display: none;
    position: absolute;
    top: 78px;
    left: 4%;
    right: 4%;
    background: #111;
    border: 1px solid #333;
    border-radius: 24px;
    padding: 16px;
    box-shadow: 0 25px 60px #0006;
    flex-direction: column;
    align-items: stretch;
  }

  .menu.open {
    display: flex;
  }

  .menu-btn {
    display: block;
    margin-left: auto;
    border: 0;
    background: var(--yellow);
    color: #000;
    border-radius: 12px;
    padding: 10px 13px;
    font-weight: 800;
  }

  .nav > .btn {
    display: none;
  }

  .dropdown__list {
    position: static;
    box-shadow: none;
    margin-top: 4px;
  }

  .hero__overlay {
    padding: 30px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .quick-info,
  .products {
    grid-template-columns: repeat(2, 1fr);
  }

  .section__head,
  .cta-strip,
  .about {
    display: block;
  }

  .filters {
    justify-content: flex-start;
    margin-top: 18px;
  }

  .about__image img {
    min-height: 260px;
    margin-bottom: 24px;
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

.products-page {
  background: #fff;
  padding-bottom: 50px;
}

.page-hero {
  background: #080808;
  color: #fff;
  padding: 70px 0;
  border-bottom: 4px solid var(--yellow);
}

.page-hero h1 {
  font-size: 46px;
  margin: 15px 0 10px;
}

.page-hero p {
  color: #d6d6d6;
  font-size: 18px;
}

.products-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 30px;
  margin-top: 40px;
}

.products-sidebar {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 24px;
  height: max-content;
  position: sticky;
  top: 110px;
}

.products-sidebar h3 {
  margin-top: 0;
}

.products-sidebar .filter {
  width: 100%;
  margin-bottom: 10px;
  text-align: left;
}

.products-content {
  min-width: 0;
}

.products-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 25px;
  align-items: center;
}

.products-toolbar h2 {
  margin: 0;
  font-size: 32px;
}

.products-toolbar p {
  color: var(--muted);
  margin: 6px 0 0;
}

.products-toolbar input {
  width: 280px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 14px 18px;
  font-size: 14px;
  outline: none;
}

.products-toolbar input:focus {
  border-color: var(--yellow);
}

@media (max-width: 980px) {
  .products-layout {
    grid-template-columns: 1fr;
  }

  .products-sidebar {
    position: static;
  }

  .products-toolbar {
    display: block;
  }

  .products-toolbar input {
    width: 100%;
    margin-top: 18px;
  }
}

.product-detail-page {
  background: #fff;
}

.product-breadcrumb {
  background: #f6f7f9;
  padding: 18px 0;
  font-size: 14px;
}

.product-breadcrumb a {
  color: #111;
  text-decoration: none;
  font-weight: 700;
}

.product-breadcrumb span {
  margin: 0 8px;
  color: #999;
}

.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  padding: 50px 0;
}

.product-gallery {
  background: #fff;
}

.gallery-main {
  position: relative;
  height: 520px;
  background: #f7f7f7;
  border: 1px solid var(--line);
  border-radius: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.gallery-main img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.gallery-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 50%;
  background: #000;
  color: #fff;
  font-size: 32px;
  cursor: pointer;
  z-index: 2;
}

.gallery-prev {
  left: 18px;
}

.gallery-next {
  right: 18px;
}

.gallery-arrow:hover {
  background: var(--yellow);
  color: #000;
}

.gallery-thumbs {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.thumb {
  width: 96px;
  height: 86px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  padding: 8px;
  cursor: pointer;
}

.thumb.active {
  border: 2px solid var(--yellow);
}

.thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.product-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.product-info h1 {
  font-size: 42px;
  line-height: 1.1;
  margin: 16px 0 8px;
}

.product-code {
  color: var(--muted);
  font-weight: 700;
}

.product-description {
  color: #4d535f;
  line-height: 1.8;
  font-size: 17px;
}

.product-highlights {
  display: grid;
  gap: 12px;
  margin: 26px 0;
}

.product-highlights article {
  background: #f8f8f8;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
}

.product-highlights strong {
  display: block;
  margin-bottom: 5px;
}

.product-highlights span {
  color: var(--muted);
}

.product-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.product-extra {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 50px;
}

.detail-box {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 30px;
  box-shadow: 0 15px 40px #0000000a;
}

.detail-box h2 {
  margin-top: 0;
}

.detail-box p,
.detail-box li {
  color: #4d535f;
  line-height: 1.8;
}

.related-section {
  background: #f6f7f9;
  padding: 55px 0;
}

.related-controls {
  display: flex;
  gap: 10px;
}

.related-controls button {
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 50%;
  background: #000;
  color: #fff;
  font-size: 28px;
  cursor: pointer;
}

.related-controls button:hover {
  background: var(--yellow);
  color: #000;
}

.related-carousel {
  overflow: hidden;
}

.related-track {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding-bottom: 10px;
}

.related-track::-webkit-scrollbar {
  height: 6px;
}

.related-track::-webkit-scrollbar-thumb {
  background: #ccc;
  border-radius: 10px;
}

.related-card {
  min-width: 280px;
  max-width: 280px;
}

@media (max-width: 980px) {
  .product-detail,
  .product-extra {
    grid-template-columns: 1fr;
  }

  .product-info h1 {
    font-size: 34px;
  }

  .gallery-main {
    height: 390px;
  }
}

@media (max-width: 620px) {
  .product-detail {
    padding: 30px 0;
  }

  .gallery-main {
    height: 320px;
    padding: 25px;
    border-radius: 22px;
  }

  .gallery-arrow {
    width: 38px;
    height: 38px;
    font-size: 26px;
  }

  .thumb {
    width: 76px;
    height: 70px;
  }

  .product-info h1 {
    font-size: 28px;
  }

  .product-actions .btn {
    width: 100%;
  }

  .detail-box {
    padding: 22px;
  }

  .related-card {
    min-width: 255px;
    max-width: 255px;
  }
}

Segue a página sobre.html pronta:

<!DOCTYPE html>
<html lang="pt-BR">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Sobre a Empresa | GT Auto Diesel</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
<header class="header">
  <div class="container nav">
    <a class="brand" href="index.html">
      <img src="assets/logo.png" alt="GT Auto Diesel">
    </a>
    <button class="menu-btn" id="menuBtn">☰</button>
    <nav class="menu" id="mobileMenu">
      <a href="index.html">Início</a>
      <a href="produtos.html">Produtos</a>
      <a href="sobre.html">Sobre</a>
      <a href="index.html#atendimento">Atendimento</a>
      <a href="index.html#ofertas">Ofertas</a>
    </nav>
    <a class="btn btn--yellow" href="https://wa.me/5562997001841" target="_blank">
      Orçamento via WhatsApp
    </a>
  </div>
</header>
<main class="about-page">
  <section class="about-hero">
    <div class="container about-hero__content">
      <span class="eyebrow">GT Auto Diesel</span>
      <h1>Peças novas para caminhões com atendimento completo em Catalão</h1>
      <p>
        Qualidade, confiança e estrutura para atender motoristas, empresas e frotistas
        que precisam de agilidade na compra de peças para caminhões.
      </p>
    </div>
  </section>
  <section class="container about-company">
    <div class="about-company__image">
      <img src="assets/empresa.jpg" alt="GT Auto Diesel">
    </div>
    <div class="about-company__text">
      <span class="eyebrow">Quem somos</span>
      <h2>Especialistas em peças novas para caminhões</h2>
      <p>
        A GT Auto Diesel atua no mercado de peças novas para caminhões em geral,
        oferecendo soluções para quem busca qualidade, segurança e bom atendimento.
      </p>
      <p>
        Contamos também com uma oficina completa para melhor atender nossos clientes,
        reunindo peças, acessórios, funilaria e pintura, recuperação de cabines,
        auto elétrica e mecânica em geral.
      </p>
      <p>
        Tudo isso em um só lugar, com uma equipe preparada para orientar você na escolha
        da peça certa para o seu caminhão.
      </p>
    </div>
  </section>
  <section class="container about-pillars">
    <article>
      <span>01</span>
      <h3>Missão</h3>
      <p>
        Atender aos nossos clientes com produtos de excelência, que contribuam para
        o bem-estar pessoal e profissional.
      </p>
    </article>
    <article>
      <span>02</span>
      <h3>Visão</h3>
      <p>
        Ser empresa de referência, reconhecida como melhor opção por clientes,
        colaboradores e comunidade, tendo em vista a qualidade de nossos serviços.
      </p>
    </article>
    <article>
      <span>03</span>
      <h3>Valores</h3>
      <p>
        Integridade, honestidade, comprometimento, valorização humana, capacitação
        contínua, inovação e ética.
      </p>
    </article>
  </section>
  <section class="about-numbers">
    <div class="container numbers-grid">
      <article>
        <strong>Peças novas</strong>
        <span>Produtos selecionados para caminhões.</span>
      </article>
      <article>
        <strong>Atendimento direto</strong>
        <span>Orçamento rápido pelo WhatsApp.</span>
      </article>
      <article>
        <strong>Oficina completa</strong>
        <span>Mecânica, elétrica, cabines e pintura.</span>
      </article>
      <article>
        <strong>Catalão - GO</strong>
        <span>Atendimento no Setor Colonial.</span>
      </article>
    </div>
  </section>
  <section class="container about-services">
    <div class="section__head">
      <div>
        <span class="eyebrow">Estrutura completa</span>
        <h2>O que a GT oferece</h2>
      </div>
    </div>
    <div class="services-grid">
      <article>
        <h3>Peças para caminhões</h3>
        <p>Venda de peças novas para caminhões em geral.</p>
      </article>
      <article>
        <h3>Acessórios</h3>
        <p>Produtos e acessórios para manutenção e reposição.</p>
      </article>
      <article>
        <h3>Funilaria e pintura</h3>
        <p>Serviço especializado para recuperação estética e estrutural.</p>
      </article>
      <article>
        <h3>Recuperação de cabines</h3>
        <p>Estrutura para recuperação de cabines de caminhões.</p>
      </article>
      <article>
        <h3>Auto elétrica</h3>
        <p>Atendimento técnico para sistemas elétricos automotivos.</p>
      </article>
      <article>
        <h3>Mecânica em geral</h3>
        <p>Suporte completo para manutenção de caminhões.</p>
      </article>
    </div>
  </section>
  <section class="container about-cta">
    <div>
      <span class="eyebrow">Precisa de uma peça?</span>
      <h2>Solicite seu orçamento agora</h2>
      <p>
        Fale com a equipe da GT Auto Diesel e encontre a peça certa para o seu caminhão.
      </p>
    </div>
    <a class="btn btn--yellow" href="https://wa.me/5562997001841" target="_blank">
      Chamar no WhatsApp
    </a>
  </section>
</main>
<footer class="footer">
  <div class="container footer__grid">
    <div>
      <img src="assets/logo.png" alt="GT Auto Diesel" style="height:45px;">
      <p>
        Peças novas para caminhões, atendimento especializado e oficina completa
        em Catalão - GO.
      </p>
    </div>
    <div>
      <h4>Categorias</h4>
      <a href="produtos.html">Acessórios</a>
      <a href="produtos.html">Direção</a>
      <a href="produtos.html">Câmbio</a>
      <a href="produtos.html">Freios</a>
      <a href="produtos.html">Motor</a>
      <a href="produtos.html">Suspensão</a>
    </div>
    <div>
      <h4>Institucional</h4>
      <a href="sobre.html">Sobre a empresa</a>
      <a href="#">Política de Privacidade</a>
      <a href="#">Termos de Uso</a>
      <a href="#">Trabalhe Conosco</a>
    </div>
    <div>
      <h4>Atendimento</h4>
      <p>Zap: (62) 99700-1841</p>
      <p>Telefone: (64) 3442-1966</p>
      <p>Setor Colonial, Catalão - GO, 75710-707</p>
    </div>
  </div>
  <div class="footer__bottom">
    GT Auto Diesel © Todos os direitos reservados.
  </div>
</footer>
<script>
const menuBtn = document.getElementById('menuBtn');
const menu = document.getElementById('mobileMenu');
if (menuBtn && menu) {
  menuBtn.addEventListener('click', () => {
    menu.classList.toggle('open');
  });
}
</script>
</body>
</html>

CSS extra para adicionar no style.css:

.about-page {
  background: #fff;
}
.about-hero {
  background:
    linear-gradient(90deg, rgba(0,0,0,.88), rgba(0,0,0,.55)),
    url("assets/empresa.jpg") center/cover;
  color: #fff;
  padding: 90px 0;
  border-bottom: 4px solid var(--yellow);
}
.about-hero__content {
  max-width: 760px;
}
.about-hero h1 {
  font-size: 48px;
  line-height: 1.08;
  margin: 18px 0;
}
.about-hero p {
  font-size: 18px;
  line-height: 1.7;
  color: #e6e6e6;
}
.about-company {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 44px;
  align-items: center;
  padding: 70px 0;
}
.about-company__image img {
  width: 100%;
  height: 520px;
  object-fit: cover;
  border-radius: 30px;
}
.about-company__text h2 {
  font-size: 40px;
  line-height: 1.12;
  margin: 16px 0;
}
.about-company__text p {
  color: #4d535f;
  line-height: 1.8;
  font-size: 16px;
}
.about-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-bottom: 60px;
}
.about-pillars article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 30px;
  box-shadow: 0 20px 50px #0000000a;
}
.about-pillars span {
  display: inline-flex;
  background: var(--yellow);
  color: #000;
  font-weight: 900;
  padding: 8px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.about-pillars h3 {
  font-size: 24px;
  margin: 0 0 12px;
}
.about-pillars p {
  color: #4d535f;
  line-height: 1.7;
}
.about-numbers {
  background: #080808;
  padding: 45px 0;
}
.numbers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.numbers-grid article {
  border: 1px solid #222;
  border-radius: 22px;
  padding: 24px;
  background: #111;
}
.numbers-grid strong {
  display: block;
  color: #fff;
  font-size: 20px;
  margin-bottom: 8px;
}
.numbers-grid span {
  color: #cfcfcf;
  line-height: 1.5;
}
.about-services {
  padding: 70px 0;
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.services-grid article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 26px;
  transition: .25s;
}
.services-grid article:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 45px #00000012;
}
.services-grid h3 {
  margin: 0 0 10px;
}
.services-grid p {
  color: #4d535f;
  line-height: 1.6;
}
.about-cta {
  margin-bottom: 70px;
  background: #111;
  color: #fff;
  border-radius: 32px;
  padding: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}
.about-cta h2 {
  font-size: 36px;
  margin: 14px 0 8px;
}
.about-cta p {
  color: #d7d7d7;
  line-height: 1.6;
}
@media (max-width: 980px) {
  .about-company,
  .about-pillars,
  .numbers-grid,
  .services-grid {
    grid-template-columns: 1fr 1fr;
  }
  .about-cta {
    display: block;
  }
  .about-cta .btn {
    margin-top: 20px;
  }
}
@media (max-width: 620px) {
  .about-hero {
    padding: 65px 0;
  }
  .about-hero h1 {
    font-size: 34px;
  }
  .about-company,
  .about-pillars,
  .numbers-grid,
  .services-grid {
    grid-template-columns: 1fr;
  }
  .about-company__image img {
    height: 330px;
  }
  .about-company__text h2 {
    font-size: 30px;
  }
  .about-cta {
    padding: 28px;
    border-radius: 24px;
  }
  .about-cta h2 {
    font-size: 28px;
  }
}

@media (max-width: 620px) {
  .topbar__content {
    display: block;
    text-align: center;
  }

  .brand img {
    height: 30px;
  }

  .hero__banner {
    height: 520px;
  }

  .hero__overlay {
    background: linear-gradient(180deg, #000c, #000b);
  }

  .quick-info,
  .products,
  .footer__grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 22px;
    border-radius: 24px;
  }

  .section h2,
  .about h2,
  .cta-strip h2 {
    font-size: 27px;
  }

  .card__img {
    height: 210px;
  }

  .about {
    padding: 22px;
    border-radius: 24px;
  }

  .cta-strip {
    padding: 26px;
  }

  .float-whats {
    left: 20px;
    text-align: center;
  }
}