body {
    min-height: 100vh;
    font-family: 'Poppins', sans-serif;
}

.semester-tile {
    text-decoration: none;
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.grid > * {
    animation: fadeIn 0.5s ease-out forwards;
}

.grid > *:nth-child(1) { animation-delay: 0.1s; }
.grid > *:nth-child(2) { animation-delay: 0.2s; }
.grid > *:nth-child(3) { animation-delay: 0.3s; }
.grid > *:nth-child(4) { animation-delay: 0.4s; }
.grid > *:nth-child(5) { animation-delay: 0.5s; }
.grid > *:nth-child(6) { animation-delay: 0.6s; }
.grid > *:nth-child(7) { animation-delay: 0.7s; }
.grid > *:nth-child(8) { animation-delay: 0.8s; }

/* Enhanced tile animations */
.semester-tile div {
    backface-visibility: hidden;
}

.semester-tile:hover div {
    transform: translateY(-8px);
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Mobile Menu Styles */
.mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.mobile-menu.active {
    max-height: 200px;
}

/* Hamburger Menu Styles */
.hamburger {
    width: 24px;
    height: 20px;
    position: relative;
    cursor: pointer;
}

.hamburger span {
    display: block;
    position: absolute;
    height: 2px;
    width: 100%;
    background: #4B5563;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger span:nth-child(1) {
    top: 0;
}

.hamburger span:nth-child(2) {
    top: 9px;
}

.hamburger span:nth-child(3) {
    bottom: 0;
}

/* Hamburger Animation */
#mobile-menu-button.active .hamburger span:nth-child(1) {
    transform: rotate(45deg);
    top: 9px;
}

#mobile-menu-button.active .hamburger span:nth-child(2) {
    opacity: 0;
}

#mobile-menu-button.active .hamburger span:nth-child(3) {
    transform: rotate(-45deg);
    bottom: 9px;
}