/* General Fade-in Animation */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.appear {
    opacity: 1;
    transform: translateY(0);
}

/* Scale-up on Hover for Cards */
.card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

/* Button Press Effect */
.btn {
    transition: transform 0.2s ease, background-color 0.3s ease;
}

.btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Hero Section Text Animation */
.hero h2, .hero p, .hero .btn {
    opacity: 0;
    transform: translateY(30px);
    animation-fill-mode: forwards;
}

.hero h2 {
    animation: slideInUp 0.8s ease-out 0.2s forwards;
}

.hero p {
    animation: slideInUp 0.8s ease-out 0.4s forwards;
}

.hero .btn {
    animation: slideInUp 0.8s ease-out 0.6s forwards;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Section Title Underline Animation */
section h3::after {
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.5s ease-out;
}

section.appear h3::after {
    transform: scaleX(1);
}

/* Navigation Link Hover Underline */
nav ul li a {
    position: relative;
    overflow: hidden;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #3498db;
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform 0.3s ease-out;
}

nav ul li a:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* Hamburger Menu Animation */
.menu-toggle.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-toggle.active .bar:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}