/* Resets & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: #0f172a;
    color: #e2e8f0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================================
   COMPROVANDO O USO DE CLASSES E COMBINADORES EM CSS
   ======================================================== */


/* 1. Combinador Descendente (espaço) */
/* Seleciona TODOS os 'a' que são descendentes (filhos, netos) de '.nav-container' */
.nav-container a {
    text-decoration: none;
    color: #cbd5e1;
    font-weight: 600;
    transition: color 0.3s ease;
}

/* 2. Combinador Filho Direto (>) */
/* Seleciona APENAS os elementos 'li' que são filhos direitos de '.nav-list' */
.nav-list > li {
    list-style: none;
    position: relative;
    padding: 0.5rem 0;
}

/* Styling nav container com Classes */
.main-header {
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid #334155;
    padding: 1.25rem 2.5rem;
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 10;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.7rem;
    color: #f8fafc;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo .highlight {
    color: #3b82f6;
}

.nav-list {
    display: flex;
    gap: 2.5rem;
}

/* Animações e Hovers usando interações */
.nav-container a:hover,
.nav-container a.active {
    color: #3b82f6;
}

.nav-list > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #3b82f6;
    transition: width 0.3s ease;
}

.nav-list > li > a:hover::after,
.nav-list > li > a.active::after {
    width: 100%;
}

/* Layout Secundário */
.hero-section, .about-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 5rem 2rem;
    gap: 3.5rem;
}

.content-wrapper {
    max-width: 800px;
}

.title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: 2.5rem;
    color: #f8fafc;
    margin-bottom: 1.5rem;
}

/* 3. Combinador Irmão Geral (~) */
/* Seleciona QUALQUER parágrafo (p) que venha após um 'h2' no mesmo nível hierárquico dentro de '.content-wrapper' */
.content-wrapper h2 ~ p {
    font-size: 1.25rem;
    color: #94a3b8;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

/* Buttons (Uso extensivo de classes combinadas) */
.btn {
    display: inline-block;
    padding: 0.85rem 2rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-decoration: none;
    margin-top: 1rem;
}

.primary-btn {
    background: #3b82f6;
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.primary-btn:hover {
    background: #2563eb;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.6);
}

.secondary-btn {
    background: transparent;
    color: #3b82f6;
    border: 2px solid #3b82f6;
}

.secondary-btn:hover {
    background: rgba(59, 130, 246, 0.1);
    transform: translateY(-3px);
}

/* Features */
.features-wrapper {
    display: flex;
    gap: 2.5rem;
    max-width: 1000px;
    justify-content: center;
    flex-wrap: wrap;
}

.feature-card {
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(5px);
    border: 1px solid #334155;
    border-radius: 1.25rem;
    padding: 2.5rem;
    width: 340px;
    text-align: left;
    transition: transform 0.3s ease, border-color 0.3s ease;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: #3b82f6;
    box-shadow: 0 15px 35px rgba(0,0,0,0.2);
}

.feature-card h2 {
    font-size: 1.6rem;
    margin-bottom: 0.5rem;
}

/* 4. Combinador Irmão Adjacente (+) */
/* Seleciona APENAS o primeiro 'p' que seja irmão imediatamente após um 'h2' em '.feature-card' */
.feature-card h2 + p {
    color: #cbd5e1;
    margin-top: 1rem;
    font-size: 1rem;
    line-height: 1.5;
    border-top: 1px dashed #475569;
    padding-top: 1rem;
}

.highlight-text {
    color: #38bdf8 !important;
    font-weight: 700;
}