/* --- CSS Variables --- */
:root {
    /* Colors */
    --color-primary: #003366; /* Azul Escuro (MD) */
    --color-primary-dark: #002244;
    --color-primary-light: #0055a4;
    --color-secondary: #FF9100; /* Laranja (Detalhes) */
    --color-secondary-dark: #E08000;
    --color-accent: #00B1D1; /* Ciano (Detalhes) */
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-gray-100: #F8F9FA;
    --color-gray-200: #E9ECEF;
    --color-gray-800: #343A40;
    --color-gray-900: #212529;
    --color-background-light: var(--color-white);
    --color-background-alt: var(--color-gray-100);
    --color-background-dark: var(--color-primary-dark);
    --color-text-light-bg: var(--color-gray-800);
    --color-text-dark-bg: var(--color-gray-200);

    /* Typography */
    --font-family-base: 'Poppins', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.7;
    --line-height-heading: 1.2;

    /* Spacing */
    --spacing-4: 1rem;
    --spacing-8: 2rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --section-padding-y-desktop: 80px;
    --section-padding-y-mobile: 40px;
    --container-max-width: 1140px;
    --mobile-margin-x: 20px;

    /* Borders & Radius */
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-full: 9999px;

    /* Shadows */
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 15px 30px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.2s ease-out;
    --transition-normal: 0.4s ease-out;
}

/* --- Reset & Base Styles --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family-base);
    color: var(--color-text-light-bg);
    background-color: var(--color-background-light);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: var(--color-secondary);
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-secondary-dark);
}

ul {
    list-style: none;
}

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

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--color-primary-dark);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
p { line-height: var(--line-height-base); }

/* --- Layout --- */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-4);
    padding-right: var(--spacing-4);
}

.section {
    padding-top: var(--section-padding-y-desktop);
    padding-bottom: var(--section-padding-y-desktop);
    overflow: hidden;
}

.bg-light { background-color: var(--color-background-alt); }
.bg-dark { background-color: var(--color-background-dark); }

.bg-dark h1, .bg-dark h2, .bg-dark h3, .bg-dark p, .bg-dark .section-subtitle {
    color: var(--color-white);
}
.bg-dark .section-description { color: var(--color-text-dark-bg); }

/* --- Components --- */
.btn {
    display: inline-block;
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 2px solid transparent;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: var(--border-radius-full);
    transition: all var(--transition-normal);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-primary {
    background-color: var(--color-secondary);
    color: var(--color-white);
    border-color: var(--color-secondary);
}

.btn-primary:hover {
    background-color: var(--color-secondary-dark);
    border-color: var(--color-secondary-dark);
    color: var(--color-white);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-outline-dark {
    color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

.btn-outline-dark:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
}

.section-header {
    text-align: center;
    max-width: 750px;
    margin: 0 auto var(--spacing-12);
}

.section-subtitle {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.section-title {
    margin-bottom: var(--spacing-4);
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-text-light-bg);
}

/* --- Preloader --- */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-white);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

.preloader.hide {
    opacity: 0;
    visibility: hidden;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--color-gray-200);
    border-top: 5px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* --- Header --- */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--color-primary-dark);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal), padding var(--transition-normal);
    padding: 1rem 0;
    box-shadow: var(--shadow-md);
}

.main-header.scrolled {
    padding: 0.75rem 0;
}

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

.site-logo img {
    max-height: 50px;
    transition: transform var(--transition-fast);
}

.site-logo:hover img {
    transform: scale(1.05);
}

.main-nav {
    display: flex;
    justify-content: center;
    flex-grow: 1;
}

.main-nav ul {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
}

.main-nav a {
    color: var(--color-white);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    opacity: 0.8;
}

.main-nav a:hover,
.main-nav a.active {
    opacity: 1;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: width var(--transition-normal);
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--color-white);
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.header-social {
    margin-left: var(--spacing-8);
}

.header-social a {
    color: var(--color-white);
    font-size: 1.5rem;
    opacity: 0.8;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.header-social a:hover {
    opacity: 1;
    transform: scale(1.1);
}

/* --- Hero Section --- */
.hero-section {
    background-color: var(--color-background-light);
    padding-top: calc(var(--section-padding-y-desktop) + 90px);
}

.hero-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-16);
}

.hero-text {
    flex: 1.1;
}

.hero-text h1 {
    margin-bottom: var(--spacing-4);
}

.hero-text p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-8);
    max-width: 500px;
}

.hero-image {
    flex: 0.9;
    max-width: 500px;
}

.hero-image img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.hero-image:hover img {
    transform: scale(1.03);
    box-shadow: var(--shadow-2xl);
}

/* --- About Section --- */
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
}

.about-item {
    background-color: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.about-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.about-icon {
    font-size: 3rem;
    color: var(--color-secondary);
    margin-bottom: 1.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background-color: rgba(255, 145, 0, 0.1);
    border-radius: 50%;
    transition: all var(--transition-normal);
}

.about-item:hover .about-icon {
    background-color: var(--color-secondary);
    color: var(--color-white);
    transform: rotate(15deg);
}

.about-item h3 {
    margin-bottom: var(--spacing-4);
    min-height: 56px; /* for 2 lines */
}

/* --- Solutions Section --- */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-8);
}

.solution-card {
    background-color: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-8);
    border-radius: var(--border-radius-lg);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: background-color var(--transition-normal), transform var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.solution-card .solution-description {
    flex-grow: 1;
}

.solution-card:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-10px);
}

.solution-icon {
    font-size: 3rem;
    color: var(--color-accent);
    margin-bottom: 1.5rem;
}

.solution-title {
    color: var(--color-white);
    margin-bottom: var(--spacing-4);
}

.solution-description {
    color: var(--color-text-dark-bg);
}

/* --- Detailed Solutions Section --- */
.solutions-grid {
    grid-template-columns: repeat(3, 1fr);
}

/* --- Quality Section --- */
.quality-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-16);
}

.quality-image {
    flex: 1;
    max-width: 200px;
    margin: 0 auto;
}

.quality-text {
    flex: 2;
}

/* --- Structure Section --- */
.structure-gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
}

.gallery-item:hover {
    transform: scale(1.05);
}

.gallery-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 51, 102, 0.7);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}


/* --- Contact Section --- */
.contact-wrapper {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-12);
    background-color: var(--color-background-alt);
    padding: var(--spacing-12);
    border-radius: var(--border-radius-lg);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    font-family: var(--font-family-base);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group .btn {
    margin-top: 1.5rem;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 85, 164, 0.1);
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-info-item i {
    font-size: 1.5rem;
    color: var(--color-secondary);
    margin-top: 5px;
}

.contact-info-item h4 {
    margin-bottom: 0.5rem;
}

/* --- Footer --- */
.main-footer {
    background-color: var(--color-primary-dark);
    color: var(--color-text-dark-bg);
    padding: var(--spacing-12) 0 var(--spacing-8);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-12);
    margin-bottom: var(--spacing-8);
}

.footer-logo {
    max-width: 150px;
    margin-bottom: 1.5rem;
}

.footer-column h4 {
    color: var(--color-white);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.footer-column ul li {
    margin-bottom: 1rem;
}

.footer-column a {
    color: var(--color-text-dark-bg);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}

.footer-bottom .fa-heart {
    color: var(--color-secondary);
}

/* --- Utility Classes --- */
.whatsapp-float {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background-color: #25D366;
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-fast);
    z-index: 999;
}

.whatsapp-float:hover {
    transform: scale(1.1);
}

.back-to-top {
    position: fixed;
    bottom: 100px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    transition: opacity var(--transition-normal), visibility var(--transition-normal), transform var(--transition-fast);
    opacity: 0;
    visibility: hidden;
    z-index: 998;
    border: none;
}

.back-to-top.active {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-5px);
}

/* --- Desktop First: Tablet Styles --- */
@media (max-width: 991px) {
    .container {
        max-width: 720px;
    }

    .main-nav {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: var(--color-white);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }

    .main-nav.active {
        transform: translateX(0);
    }

    .main-nav ul {
        flex-direction: column;
        gap: var(--spacing-8);
    }

    .main-nav a {
        font-size: 1.5rem;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .header-social {
        display: none; /* Ocultar no menu mobile principal, pode ser adicionado dentro do menu off-canvas se necessário */
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-text {
        order: 2;
    }

    .hero-image {
        order: 1;
        margin-bottom: var(--spacing-8);
    }

    .hero-text p {
        margin-left: auto;
        margin-right: auto;
    }

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

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

    .structure-gallery {
        grid-template-columns: repeat(2, 1fr);
    }

    .quality-content {
        flex-direction: column;
        text-align: center;
    }

    .quality-image {
        margin-bottom: var(--spacing-8);
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-column.about {
        align-items: center;
        display: flex;
        flex-direction: column;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
    }
}

/* --- Mobile Styles --- */
@media (max-width: 767px) {
    body {
        font-size: 15px;
    }

    .section {
        padding-top: var(--section-padding-y-mobile);
        padding-bottom: var(--section-padding-y-mobile);
    }

    .container {
        padding-left: var(--mobile-margin-x);
        padding-right: var(--mobile-margin-x);
    }

    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.75rem; }

    .hero-section {
        padding-top: calc(var(--section-padding-y-mobile) + 80px);
    }

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

    .structure-gallery {
        grid-template-columns: 1fr;
    }

    .btn {
        width: 100%;
        display: block;
    }

    .btn-lg {
        width: 100%;
        display: block;
    }

    .btn-outline-dark {
        width: 100%;
        display: block;
    }
}