:root {
    --bg-color: #0f172a;
    --accent-color: #38bdf8;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --card-bg: rgba(30, 41, 59, 0.7);
    
    /* Escala de espaçamento baseada em rem */
    --spacing-sm: 0.5rem;   /* 8px */
    --spacing-md: 1rem;     /* 16px */
    --spacing-lg: 2rem;     /* 32px */
    --spacing-xl: 4rem;     /* 64px */
}

/* Reset e Acessibilidade */
* { 
    margin: 0; 
    padding: 0; 
    box-sizing: border-box; 
    font-family: 'Inter', sans-serif; 
}

html {
    font-size: 100%; /* Garante que 1rem = 16px por padrão */
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container { 
    width: 90%; 
    max-width: 1100px; 
    margin: 0 auto; 
    padding: var(--spacing-lg) 0; 
}

/* Header Reestruturado para Mobile First */
header {
    display: flex;
    flex-direction: column; /* Começa empilhado no celular */
    align-items: center;
    text-align: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 1s ease-out;
}

.profile-img {
    width: clamp(120px, 30vw, 180px); /* Tamanho dinâmico entre 120px e 180px */
    aspect-ratio: 1 / 1;
    border-radius: 50%;
    border: 3px solid var(--accent-color);
    object-fit: cover;
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.2);
}

.intro h1 { 
    font-size: 2.2rem; 
    letter-spacing: -1px;
}

.intro h2 { 
    color: var(--accent-color); 
    font-size: 1rem; 
    text-transform: uppercase; 
    letter-spacing: 0.15rem; 
}

.intro p a {
    text-decoration: none;
    color: var(--text-secondary);
}

.about p {
    margin-bottom: 1rem;
}

/* Grid de Cards Responsivo (CSS Grid) */
.skills-grid {
    display: grid;
    /* Cria colunas automaticamente com no mínimo 280px */
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.card {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: 1rem;
    border: 1px solid rgba(255,255,255,0.05);
    backdrop-filter: blur(8px); /* Efeito de vidro */
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover { 
    transform: translateY(-8px); 
    border-color: var(--accent-color);
    background: rgba(30, 41, 59, 0.9);
}

.tags {
    display: flex;
    flex-wrap: wrap; 
    gap: 0.5rem;    
    margin-top: 1.25rem;
}

.tag {
    background: rgba(255, 255, 255, 0.05); 
    color: var(--text-primary);
    font-size: 0.85rem;
    padding: 0.4em 1em; 
    border-radius: 2rem; /* Formato de pílula total */
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(4px);
    transition: all 0.2s ease;
    white-space: nowrap; 
}

.tag:hover {
    border-color: var(--accent-color);
    background: rgba(56, 189, 248, 0.1); /* Um leve brilho no hover */
    transform: scale(1.05);
}

/* Footer / Links de Contato */
.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    justify-content: center;
}

.social-links a {
    color: var(--text-primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255,255,255,0.03);
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    transition: 0.3s;
    font-size: 0.9rem;
}

.social-links a:hover {
    background: var(--accent-color);
    color: var(--bg-color);
    font-weight: bold;
}

/* Media Queries para ajuste fino em telas maiores */
@media (min-width: 768px) {
    header {
        flex-direction: row; /* Alinha lado a lado no desktop */
        text-align: left;
        gap: var(--spacing-xl);
    }
    
    .intro h1 { font-size: 3rem; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}