/* ==========================================================================
   VARIÁVEIS DE CORES PREMIUM E CONFIGURAÇÕES INDUSTRIAIS
   ========================================================================== */
:root {
    --carbon-bg: #111215;         /* Fundo principal ultra escuro */
    --carbon-surface: #191b22;    /* Fundo dos cards e seções */
    --carbon-light: #22252e;      /* Inputs e caixas internas */
    --accent-red: #d32f2f;        /* Vermelho lubrificante/mecânico */
    --accent-red-hover: #b71c1c;  /* Vermelho escuro para hovers */
    --text-pure-white: #f8fafc;   /* Textos em destaque */
    --text-slate: #94a3b8;        /* Textos de apoio e parágrafos */
    --whatsapp-green: #25D366;    /* Cor padrão do WhatsApp */
    --border-steel: #2e323e;      /* Bordas simulando encaixe metálico */
    --font-main: 'Inter', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--carbon-bg);
    color: var(--text-slate);
    font-family: var(--font-main);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* COMPONENTES GERAIS REUTILIZÁVEIS */
.accent-red { color: var(--accent-red); }
.subtitle-red { color: var(--accent-red); text-transform: uppercase; font-size: 11px; font-weight: 700; letter-spacing: 2px; display: block; margin-bottom: 8px; }

.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 32px; color: var(--text-pure-white); font-weight: 800; margin-bottom: 15px; text-transform: uppercase; letter-spacing: -0.5px; }
.section-title p { color: var(--text-slate); font-size: 15px; }

.btn-primary {
    display: inline-block;
    background-color: var(--accent-red);
    color: var(--text-pure-white);
    padding: 14px 30px;
    text-decoration: none;
    font-weight: 700;
    border-radius: 4px;
    text-transform: uppercase;
    font-size: 13px;
    letter-spacing: 0.5px;
    border: 1px solid var(--accent-red);
    transition: all 0.3s ease;
}
.btn-primary:hover { background-color: var(--accent-red-hover); border-color: var(--accent-red-hover); transform: translateY(-2px); }

/* ==========================================================================
   HEADER & NAVBAR
   ========================================================================== */
.header {
    background-color: rgba(17, 18, 21, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-steel);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-content { display: flex; justify-content: space-between; align-items: center; height: 85px; }
.logo-text { font-size: 26px; font-weight: 800; color: #fff; letter-spacing: 1px; }

.nav-menu ul { list-style: none; display: flex; gap: 32px; }
.nav-menu a { text-decoration: none; color: var(--text-slate); font-weight: 600; font-size: 14px; transition: color 0.3s; }
.nav-menu a:hover { color: var(--accent-red); }

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
    position: relative;
    background-color: #0b0c0e;
    background-image: url('https://images.unsplash.com/photo-1581091226825-a6a2a5aee158?q=80&w=1200'); /* Banner industrial de engenharia */
    background-size: cover;
    background-position: center;
    height: 70vh;
    min-height: 500px;
    display: flex;
    align-items: center;
}
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(11,12,14,0.95) 0%, rgba(11,12,14,0.6) 100%); z-index: 1; }
.hero-content { position: relative; z-index: 2; max-width: 650px; }
.badge-hero { display: inline-block; padding: 5px 12px; background-color: rgba(211, 47, 47, 0.15); border: 1px solid rgba(211,47,47,0.3); color: var(--accent-red); font-size: 11px; font-weight: 700; border-radius: 4px; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 20px; }
.hero h1 { font-size: 44px; font-weight: 800; color: #fff; line-height: 1.15; text-transform: uppercase; margin-bottom: 20px; letter-spacing: -1px; }
.hero p { font-size: 18px; color: var(--text-slate); margin-bottom: 35px; }

/* ==========================================================================
   A EMPRESA (SOBRE)
   ========================================================================== */
.about { padding: 90px 0; background-color: var(--carbon-surface); border-bottom: 1px solid var(--border-steel); }
.grid-about { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.about-img img { border-radius: 6px; border: 1px solid var(--border-steel); box-shadow: 0 20px 40px rgba(0,0,0,0.3); }
.about-text h2 { font-size: 36px; color: #fff; font-weight: 800; margin-bottom: 20px; line-height: 1.2; }
.about-text p { margin-bottom: 20px; font-size: 15px; }

/* ==========================================================================
   MECÂNICA COMPLEXA DOS CARDS FLIP 3D (DIFERENCIAIS)
   ========================================================================== */
.diferenciais-section { padding: 90px 0; }
.grid-diferenciais { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* Card base configurando a perspectiva 3D */
.flip-card {
    background-color: transparent;
    height: 180px;
    perspective: 1000px; /* Crucial para o efeito 3D real */
    cursor: pointer;
}
.card-wide { grid-column: span 4; height: 120px; } /* Ajuste do card longo de localização */

/* Container interno que vai rotacionar */
.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    transform-style: preserve-3d;
}

/* Ativação do giro no hover (computador) ou classe via JS (mobile) */
.flip-card:hover .flip-card-inner,
.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

/* Configuração comum da face frontal e traseira */
.flip-card-front, .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden; /* Esconde a face inversa ao virar */
    backface-visibility: hidden;
    border-radius: 6px;
    border: 1px solid var(--border-steel);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 24px;
}

/* Face da frente (Visual Padrão) */
.flip-card-front {
    background-color: var(--carbon-surface);
    color: #fff;
}
.icon-diff { font-size: 36px; margin-bottom: 12px; }
.flip-card-front h3 { font-size: 15px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; }

/* Face de trás (Revela o Texto solicitado nos seus prints) */
.flip-card-back {
    background-color: #1a2436; /* Azul escuro sutil para destacar a leitura */
    color: var(--text-pure-white);
    transform: rotateY(180deg); /* Já nasce invertida no espaço 3D */
    text-align: left;
    justify-content: center;
}
.flip-card-back p { font-size: 12px; line-height: 1.5; color: #e2e8f0; }

/* ==========================================================================
   PRODUTOS E FILTROS DINÂMICOS
   ========================================================================== */
.products { padding: 90px 0; background-color: var(--carbon-surface); border-top: 1px solid var(--border-steel); border-bottom: 1px solid var(--border-steel); }
.filter-buttons { display: flex; justify-content: center; gap: 10px; margin-bottom: 50px; flex-wrap: wrap; }

.btn-filter {
    background-color: var(--carbon-bg);
    border: 1px solid var(--border-steel);
    color: var(--text-slate);
    padding: 10px 22px;
    font-family: var(--font-main);
    font-weight: 600;
    font-size: 13px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}
.btn-filter:hover { border-color: var(--accent-red); color: var(--accent-red); }
.btn-filter.active { background-color: var(--accent-red); border-color: var(--accent-red); color: #fff; box-shadow: 0 4px 15px rgba(211, 47, 47, 0.3); }

/* Grid de Produtos Otimizado */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }

.product-card {
    background-color: var(--carbon-bg);
    border: 1px solid var(--border-steel);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.product-card:hover { transform: translateY(-6px); border-color: var(--accent-red); box-shadow: 0 15px 30px rgba(0,0,0,0.4); }

.product-img { height: 220px; overflow: hidden; border-bottom: 1px solid var(--border-steel); }
.product-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.product-card:hover .product-img img { transform: scale(1.05); }

.product-info { padding: 25px; display: flex; flex-direction: column; flex-grow: 1; }
.product-badge { align-self: flex-start; background-color: rgba(211, 47, 47, 0.1); color: var(--accent-red); font-size: 10px; font-weight: 700; padding: 4px 8px; border-radius: 4px; text-transform: uppercase; margin-bottom: 12px; letter-spacing: 0.5px; }
.product-info h3 { font-size: 18px; color: #fff; font-weight: 700; margin-bottom: 10px; }
.product-info p { font-size: 13px; color: var(--text-slate); margin-bottom: 20px; }

/* Lista de Especificações Internas (Melhor organização dos óleos de cada card) */
.product-spec-list { list-style: none; margin-bottom: 25px; flex-grow: 1; border-top: 1px dashed var(--border-steel); padding-top: 15px; }
.product-spec-list li { font-size: 12px; font-family: monospace; color: #e2e8f0; margin-bottom: 6px; padding-left: 12px; position: relative; }
.product-spec-list li::before { content: "▪"; color: var(--accent-red); position: absolute; left: 0; top: -1px; }

.btn-whatsapp {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--whatsapp-green);
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    font-size: 13px;
    padding: 12px;
    border-radius: 4px;
    transition: background 0.3s;
    text-align: center;
}
.btn-whatsapp:hover { background-color: #1ebd57; }

/* ==========================================================================
   SEÇÃO CONTATO & FORMULÁRIO INDUSTRIAL
   ========================================================================== */
.contact { padding: 90px 0; }
.grid-contact-section { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 50px; align-items: start; }

.form-wrapper-industrial { background-color: var(--carbon-surface); border: 1px solid var(--border-steel); padding: 40px; border-radius: 6px; }
.form-wrapper-industrial h3 { font-size: 20px; color: #fff; margin-bottom: 25px; font-weight: 700; border-bottom: 1px solid var(--border-steel); padding-bottom: 12px; }

.form-industrial { display: flex; flex-direction: column; gap: 20px; }
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 12px; font-weight: 600; color: var(--text-slate); text-transform: uppercase; letter-spacing: 0.5px; }

.form-group input, .form-group textarea {
    width: 100%;
    padding: 14px 16px;
    background-color: var(--carbon-bg);
    border: 1px solid var(--border-steel);
    border-radius: 4px;
    color: #fff;
    font-size: 14px;
    outline: none;
    transition: border 0.3s;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent-red); }
.btn-submit-ind { width: 100%; border-radius: 4px; padding: 16px; font-size: 14px; }

.contact-info-panel h2 { font-size: 36px; color: #fff; font-weight: 800; margin-bottom: 20px; }
.industrial-contact-grid { display: grid; grid-template-columns: 1fr; gap: 20px; margin-top: 35px; border-top: 1px solid var(--border-steel); padding-top: 25px; }
.ind-contact-item h4 { color: var(--text-pure-white); font-size: 14px; text-transform: uppercase; margin-bottom: 4px; }
.ind-contact-item p { font-size: 14px; color: var(--text-slate); }

/* ==========================================================================
   RODAPÉ (FOOTER)
   ========================================================================== */
.footer { background-color: #0b0c0e; border-top: 1px solid var(--border-steel); padding: 40px 0; text-align: center; }
.footer-industrial-content { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.footer-brand-ind { font-size: 24px; font-weight: 800; color: #fff; letter-spacing: 1px; margin-bottom: 5px; }
.footer p { font-size: 13px; color: #64748b; }
.vmc-signature { font-size: 12px !important; color: #475569 !important; margin-top: 10px; }
.vmc-signature strong { color: var(--text-slate); }

/* ==========================================================================
   RESPONSIVIDADE INTELIGENTE (DISPOSITIVOS MÓVEIS)
   ========================================================================== */
@media (max-width: 968px) {
    .grid-about, .grid-contact-section, .product-grid { grid-template-columns: 1fr; }
    .grid-diferenciais { grid-template-columns: repeat(2, 1fr); }
    .card-wide { grid-column: span 2; }
    .header-content { flex-direction: column; height: auto; padding: 20px 0; gap: 15px; }
    .nav-menu ul { gap: 15px; flex-wrap: wrap; justify-content: center; }
    .hero h1 { font-size: 30px; }
    .form-row-2 { grid-template-columns: 1fr; }
}

@media (max-width: 540px) {
    .grid-diferenciais { grid-template-columns: 1fr; }
    .card-wide { grid-column: span 1; }
}