:root {
    --background-dark: #121212;
    --surface-color: #1E1E1E;
    --primary-text: #FFFFFF;
    --secondary-text: #B3B3B3;
    --accent-color: #00F5A0; /* Verde Esmeralda como cor de destaque */
    --font-main: 'Inter', sans-serif;
}

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

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

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

/* Header */
.main-header {
    background-color: rgba(18, 18, 18, 0.8);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--surface-color);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-text);
    text-decoration: none;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    color: var(--secondary-text);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: var(--accent-color);
}

.cta-button {
    background-color: var(--accent-color);
    color: var(--background-dark);
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 700;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 245, 160, 0.2);
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 6rem 0;
}

.hero-section h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-section .subtitle {
    font-size: 1.25rem;
    color: var(--secondary-text);
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

.cta-button-main {
    background-color: var(--accent-color);
    color: var(--background-dark);
    padding: 1rem 2.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 700;
    display: inline-block;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-button-main:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 245, 160, 0.25);
}

/* Sections Defaults */
section {
    padding: 5rem 0;
    border-bottom: 1px solid var(--surface-color);
}

section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

/* Validation Section */
.validation-section .logos-placeholder {
    text-align: center;
    color: var(--secondary-text);
    font-style: italic;
    padding: 2rem;
    background-color: var(--surface-color);
    border-radius: 8px;
}

/* Problems Section */
.problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.problem-card {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.problem-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.problem-card .icon-placeholder {
    width: 50px;
    height: 50px;
    background-color: var(--accent-color);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    /* Placeholder for an actual icon */
}

.problem-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

/* Method Section */
.method-infographic {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    text-align: center;
}

.method-step {
    flex: 1;
    padding: 2rem;
}

.method-step span {
    display: block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    border-radius: 50%;
    background-color: var(--surface-color);
    color: var(--accent-color);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
    border: 2px solid var(--accent-color);
}

.method-step h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* CTA Final Section */
.cta-final-section {
    background-color: var(--surface-color);
    text-align: center;
    border-bottom: none;
}

.cta-final-section h2 {
    margin-bottom: 1rem;
}

.cta-final-section .subtitle {
    margin-bottom: 2rem;
    color: var(--secondary-text);
}

/* Footer */
.main-footer-bottom {
    text-align: center;
    padding: 2rem 0;
    font-size: 0.9rem;
    color: var(--secondary-text);
    background-color: var(--background-dark);
}