:root {
    --primary-color: #004d61;
    --secondary-color: #99c221;
    --bg-light: #ffffff;
    --bg-gray: #f4f6f7;
    --text-dark: #333333;
    --text-light: #ffffff;
    --font-main: 'Open Sans', sans-serif;
    --max-width: 1200px;
}

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

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

/* Layout Utilities */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-light);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--text-dark);
    /* Better contrast on lime green */
}

/* Header */
header {
    background-color: var(--bg-light);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo img {
    height: 50px;
    width: auto;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1rem;
    transition: color 0.3s;
}

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

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background-image: linear-gradient(rgba(0, 77, 97, 0.9), rgba(0, 77, 97, 0.9)), url('background_placeholder.jpg');
    /* Need a placeholder or allow user to replace */
    background-size: cover;
    background-position: center;
    color: var(--text-light);
    text-align: center;
    padding: 100px 20px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* Section General */
section {
    padding: 80px 0;
}

section h2 {
    text-align: center;
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 50px;
    position: relative;
}

section h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--secondary-color);
    margin: 15px auto 0;
}

/* Quem Somos */
.about {
    background-color: var(--bg-light);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-img img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.about-text h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

/* Serviços */
.services {
    background-color: var(--bg-gray);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--bg-light);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.service-card:hover {
    transform: translateY(-5px);
}

.service-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 20px;
    fill: var(--secondary-color);
    /* SVG fill */
}

/* Cursos */
.courses {
    background-color: var(--bg-light);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.course-card {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    background: var(--bg-light);
    transition: transform 0.3s;
}

.course-card:hover {
    transform: scale(1.02);
}

.course-img {
    height: 200px;
    background-color: #ddd;
    /* Placeholder */
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-weight: bold;
    position: relative;
}

.course-tag {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: var(--secondary-color);
    padding: 5px 10px;
    border-radius: 3px;
    font-size: 0.8rem;
    font-weight: bold;
}

.course-info {
    padding: 20px;
}

.course-title {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 700;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--text-light);
    padding: 60px 0 20px;
    text-align: center;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
    text-align: left;
}

.footer-section h4 {
    color: var(--secondary-color);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.footer-section p,
.footer-section a {
    color: #e0e0e0;
    margin-bottom: 10px;
    text-decoration: none;
    display: block;
}

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

.social-links {
    display: flex;
    gap: 15px;
}

.social-icon {
    width: 24px;
    height: 24px;
    fill: var(--text-light);
    transition: fill 0.3s;
    display: inline-flex;
    /* Ensures standard box model */
    align-items: center;
    justify-content: center;
    position: relative;
    /* Z-index context */
    z-index: 10;
}

.social-icon:hover {
    fill: var(--secondary-color);
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

/* Solar Calculator Page */
.calculator-page {
    background-color: var(--bg-gray);
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calculator-card {
    background: var(--bg-light);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    width: 100%;
    text-align: center;
}

.calculator-card h1 {
    color: var(--primary-color);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-dark);
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    border-color: var(--secondary-color);
    outline: none;
}

.result-box {
    margin-top: 30px;
    padding: 20px;
    background-color: rgba(153, 194, 33, 0.1);
    border-radius: 8px;
    display: none;
    /* Hidden by default */
}

.result-text {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 20px;
}

/* WhatsApp Float Button */
.whatsapp-float {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: #25D366;
    color: white;
    padding: 15px 20px;
    border-radius: 50px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    text-decoration: none;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 2000;
    transition: transform 0.3s;
}

.whatsapp-float:hover {
    transform: scale(1.05);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        /* Mobile menu needed */
        flex-direction: column;
        position: absolute;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--bg-light);
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        display: flex;
    }

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

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

    .hero h1 {
        font-size: 2.2rem;
    }
}