:root {
    --primary-color: #003366; /* Navy Blue */
    --secondary-color: #FFC107; /* Golden Yellow */
    --text-color: #333;
    --light-bg: #f4f4f4;
    --white: #fff;
    --whatsapp-green: #25D366;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
}

h1, h2, h3, h4 {
    font-family: 'Montserrat', sans-serif;
    color: var(--primary-color);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo span {
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links li a {
    color: var(--white);
    font-weight: 500;
    transition: var(--transition);
}

.nav-links li a:hover {
    color: var(--secondary-color);
}

.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--white);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    height: 100vh;
    background-color: var(--primary-color);
    background-image: linear-gradient(rgba(0, 51, 102, 0.55), rgba(0, 51, 102, 0.75)), url('../assets/images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    padding-top: 60px; /* Offset for fixed header */
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn-cta {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--primary-color);
    padding: 12px 30px;
    border-radius: 5px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: var(--transition);
    border: 2px solid var(--secondary-color);
}

.btn-cta:hover {
    background-color: transparent;
    color: var(--secondary-color);
}

/* Services Section */
.services {
    padding: 80px 0;
    background-color: var(--white);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--secondary-color);
    margin: 10px auto 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.services-tip {
    text-align: center;
    margin: -20px 0 30px;
    color: #5f5f5f;
    font-weight: 500;
}

.service-card {
    min-height: 300px;
    perspective: 1200px;
    border-radius: 12px;
    cursor: pointer;
}

.service-card-inner {
    position: relative;
    width: 100%;
    min-height: 300px;
    transition: transform 0.7s ease;
    transform-style: preserve-3d;
    border-radius: 12px;
}

.service-card:hover .service-card-inner,
.service-card:focus-within .service-card-inner,
.service-card.is-flipped .service-card-inner {
    transform: rotateY(180deg);
}

.service-face {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 12px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    overflow: hidden;
}

.service-front {
    background-color: var(--light-bg);
    text-align: center;
    padding: 30px 20px;
    border-bottom: 4px solid transparent;
    transition: var(--transition);
}

.service-card:hover .service-front,
.service-card.is-flipped .service-front {
    box-shadow: 0 12px 24px rgba(0,0,0,0.12);
    border-bottom-color: var(--secondary-color);
}

.service-front i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.service-face h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.service-back {
    transform: rotateY(180deg);
    background-size: cover;
    background-position: center;
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-back::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(140deg, rgba(0, 51, 102, 0.92), rgba(0, 51, 102, 0.62));
}

.service-back h3,
.service-back p {
    color: var(--white);
}

.service-back p {
    margin-bottom: 16px;
}

.service-back .service-cta {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    padding: 10px 18px;
    border-radius: 6px;
    font-weight: 700;
    display: inline-block;
    transition: var(--transition);
}

.service-back .service-cta:hover {
    transform: translateY(-2px);
}

.service-back > * {
    position: relative;
    z-index: 1;
}

.service-back {
    padding: 22px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.service-estruturas .service-back { background-image: url('../assets/images/estruturas-metalicas.jpg'); }
.service-coberturas .service-back { background-image: url('../assets/images/coberturas.jpg'); }
.service-escadas .service-back { background-image: url('../assets/images/escadas.jpg'); }
.service-mezaninos .service-back { background-image: url('../assets/images/mezaninos.jpg'); }
.service-soldagem .service-back { background-image: url('../assets/images/soldagem.jpg'); }
.service-calhas-rufos .service-back { background-image: url('../assets/images/calhas-rufos-pingadeiras.jpg'); }
.service-telhados .service-back { background-image: url('../assets/images/telhados-metalicos.jpg'); }
.service-galpoes .service-back { background-image: url('../assets/images/galpoes-barracoes.jpg'); }
.service-portoes .service-back { background-image: url('../assets/images/portoes.jpg'); }
.service-pergolados .service-back { background-image: url('../assets/images/pergolados.jpg'); }
.service-coifas .service-back { background-image: url('../assets/images/coifas.jpg'); }
.service-fechamentos .service-back { background-image: url('../assets/images/fechamentos-metalicos.jpg'); }

/* About Section */
.about {
    padding: 80px 0;
    background-color: var(--light-bg);
    text-align: center;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

/* Contact Section */
.contact {
    padding: 80px 0;
    background-color: var(--white);
}

.contact-wrapper {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
}

.contact-info {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.info-item {
    text-align: center;
    padding: 20px;
    border: 1px solid #eee;
    border-radius: 8px;
    transition: var(--transition);
}

.info-item:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.info-item i {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.info-item h4 {
    margin-bottom: 10px;
}

.info-item a {
    color: var(--primary-color);
    font-weight: 500;
}

.info-item a:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 20px 0;
    margin-top: auto;
}

/* WhatsApp Floating Button */
.whatsapp-float {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--whatsapp-green);
    color: var(--white);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 35px;
    box-shadow: 2px 2px 10px rgba(0,0,0,0.2);
    z-index: 1000;
    transition: var(--transition);
    animation: pulse 2s infinite;
}

.whatsapp-float:hover {
    transform: scale(1.1);
    background-color: #1ebc53;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7); }
    70% { box-shadow: 0 0 0 15px rgba(37, 211, 102, 0); }
    100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: block;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .nav-links {
        position: fixed;
        left: -100%;
        top: 60px; /* header height */
        flex-direction: column;
        background-color: var(--primary-color);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: 20px 0;
    }

    .nav-links.active {
        left: 0;
    }

    .nav-links li {
        margin: 15px 0;
    }

    .hero-content h2 {
        font-size: 2rem;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .service-card,
    .service-card-inner {
        min-height: 320px;
    }
}