:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #2ecc71;
    --background-color: #f4f6f7;
    --text-color: #34495e;
    --white: #ffffff;
    --border-radius: 8px;
    --shadow: 0 4px 15px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    padding-top: 80px; /* Space for fixed header */
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header & Navigation */
.site-header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 80px;
}

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

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.logo img {
    max-width: 285px;
    width: auto;
    height: auto;
    vertical-align: middle;
}

.logo a {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: inherit;
}

.logo span {
    font-size: 0.9rem;
    font-weight: bold;
    margin-top: 5px;
}

nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex; /* Use flexbox for alignment */
}

nav li {
    display: inline-block; /* Kept for structure, but flex handles spacing */
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0 0.75rem; /* Replaces margin for better spacing */
}

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

/* Hero Section */
.hero {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 5rem 0;
    text-align: center;
    margin-top: 20px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
}

/* Main Content & Sections */
main {
    padding: 2rem 0;
}

section {
    margin-bottom: 3rem;
}

h2 {
    text-align: center;
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

/* Card Layout */
.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

#solution .card-container {
    grid-template-columns: 1fr;
}

.card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.card h3 {
    color: var(--secondary-color);
    margin-top: 0;
}

.card-image {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    margin-bottom: 1.5rem;
    object-fit: cover;
}

/* Calculator Section */
#calculator {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

#retention-form {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    align-items: end;
}

#retention-form input {
    padding: 0.8rem;
    border: 1px solid #ccc;
    border-radius: var(--border-radius);
    font-size: 1rem;
}

#retention-form button {
    background-color: var(--accent-color);
    color: var(--white);
    border: none;
    padding: 1rem;
    font-size: 1.1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#retention-form button:hover {
    background-color: #27ae60;
}

#retention-result {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: #e8f6ef;
    border-left: 5px solid var(--accent-color);
    font-size: 1.2rem;
    font-weight: bold;
}

.warning-box {
    background-color: #fffbe6;
    border: 1px solid #ffe58f;
    border-left: 5px solid #ffc107;
    padding: 1.5rem;
    margin-top: 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
}

/* CTA Section */
#cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.cta-btn {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    transition: background-color 0.3s ease;
}

.cta-btn:hover {
    background-color: #2980b9;
}

/* Floodplain Page Specifics */
#floodplain-explained .card-container {
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

#floodplain-explained .card {
    margin-bottom: 15px;
}

#linear-park-content .card-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#linear-park-content .card {
    width: 100%;
    box-sizing: border-box;
}

/* Graph Theory Page Specifics */
#graph-theory-content .card-container {
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

/* Botão Voltar ao Topo */
#back-to-top-btn {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    border: none;
    outline: none;
    background-color: var(--secondary-color);
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 50%;
    font-size: 18px;
    width: 50px;
    height: 50px;
    line-height: 1;
    transition: opacity 0.3s, visibility 0.3s;
}

#back-to-top-btn.show {
    display: block;
}


#floodplain-explained .topic,
#floodplain-explained .summary,
#floodplain-explained .linear-park {
    background-color: var(--white);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

#floodplain-explained h3 {
    color: var(--secondary-color);
}

/* Report Guide Page Specifics */
#report-guide .intro {
    font-size: 1.1rem;
    text-align: center;
    margin-bottom: 2rem;
}

.report-step, .agencies-list, .final-tip {
    background-color: var(--white);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

#report-guide h3 {
    color: var(--secondary-color);
    border-bottom: 2px solid var(--background-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

#report-guide ul {
    list-style-position: inside;
    padding-left: 0;
}

#report-guide .warning {
    background-color: #fffbe6;
    border: 1px solid #ffe58f;
    border-left: 5px solid #ffc107;
    padding: 1rem;
    border-radius: var(--border-radius);
}

/* Case Study Page Specifics */
#case-study-content h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.case-intro p {
    font-size: 1.1rem;
    text-align: center;
    margin-bottom: 2rem;
    background-color: var(--light-gray);
    padding: 1.5rem;
    border-radius: var(--border-radius);
}

.case-step {
    background-color: var(--white);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.case-step h3 {
    color: var(--secondary-color);
    border-left: 4px solid var(--secondary-color);
    padding-left: 1rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.formula-box, .result-box, .visualization-box {
    background-color: var(--light-gray);
    padding: 1.5rem;
    margin: 1rem 0;
    border-radius: var(--border-radius);
    border: 1px solid #ddd;
}

.result-box {
    border-left: 5px solid #4CAF50;
}

.result-box .volume {
    font-size: 2rem;
    font-weight: bold;
    color: #4CAF50;
    text-align: center;
}

.formula-box .final-volume {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-align: center;
    margin-top: 1rem;
}

.visualization-box {
    background-color: #e3f2fd;
    border-left: 5px solid #2196F3;
}

.comparison-list {
    list-style-type: '💧';
    padding-left: 2rem;
}

.comparison-list li {
    padding-left: 1rem;
    margin-bottom: 0.5rem;
}

.impact-points .impact-point {
    margin-top: 1.5rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1rem;
}

.impact-points .impact-point:last-child {
    border-bottom: none;
}

.impact-points .impact-point h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}


.agency-card {
    border-bottom: 1px solid #eee;
    padding: 1.5rem 0;
}

.agency-card:last-child {
    border-bottom: none;
}

.agency-card h4 {
    margin-top: 0;
    color: var(--primary-color);
}

.final-tip {
    background-color: #e8f6ef;
    border-left: 5px solid var(--accent-color);
}

.final-tip h4 {
    color: var(--accent-color);
    margin-top: 0;
}

/* Footer */
.site-footer {
    background-color: var(--primary-color);
    color: #bdc3c7;
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
}

/* Responsive Adjustments */
@media (min-width: 768px) {
    /* A regra que alinhava o formulário horizontalmente foi removida. */
}

@media (max-width: 600px) {
    .site-header .container {
        flex-direction: column;
        height: auto;
        padding: 1rem 0;
    }
    nav {
        margin-top: 1rem;
    }
    body {
        padding-top: 150px; /* Adjust for taller mobile header */
    }
    .hero h1 {
        font-size: 2.2rem;
    }
    .cta-denuncia-secao h3 {
        font-size: 1.5rem;
    }
    .cta-denuncia-btn {
        font-size: 1rem;
        padding: 0.8rem 1.5rem;
    }
}

/* Botão Call-to-Action para Denúncia */
.cta-denuncia-secao {
    text-align: center;
    padding: 2rem 0;
    margin: 2rem 0;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.cta-denuncia-secao h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 1rem;
}

.cta-denuncia-secao .cta-denuncia-btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white) !important; /* Garante que a cor do texto seja branca */
    padding: 1rem 2.5rem;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-size: 1.2rem;
    font-weight: bold;
    transition: background-color 0.3s ease, transform 0.3s ease;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.cta-denuncia-secao .cta-denuncia-btn:hover {
    background-color: #27ae60; /* Um tom um pouco mais escuro do accent-color */
    transform: translateY(-3px);
    color: var(--white) !important;
}