:root {
    --primary: #6366f1;
    /* Indigo */
    --primary-dark: #4f46e5;
    --bg-card: linear-gradient(135deg, rgba(30, 41, 59, 0.4), rgba(12, 74, 110, 0.2));
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: rgba(99, 102, 241, 0.2);
    --glow: 0 0 25px rgba(99, 102, 241, 0.4);
}

body {
    background: #020617;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
}

.font-mono {
    font-family: 'JetBrains Mono', monospace;
}

.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.portfolio-card:hover {
    transform: translateY(-8px) scale(1.03);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(99, 102, 241, 0.5);
}

.section-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.section-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

 #scrollTopBtn {
     display: none;
     /* Começa escondido */
     position: fixed;
     bottom: 20px;
     right: 30px;
     z-index: 99;
     border: none;
     outline: none;
     background: var(--primary);
     /* Cor primária site */
     color: white;
     cursor: pointer;
     padding: 12px;
     border-radius: 50%;
     width: 48px;
     height: 48px;
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
     transition: opacity 0.3s, transform 0.3s;
     opacity: 0;
     transform: translateY(20px);
 }

 #scrollTopBtn.show {
     display: flex;
     align-items: center;
     justify-content: center;
     opacity: 1;
     transform: translateY(0);
 }

 #scrollTopBtn:hover {
     background: var(--primary-dark);
     /* Cor mais escura para hover */
 }