body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: white;
    color: black;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    border-bottom: 2px solid black;
    font-family: "Caveat", cursive;
    font-style: normal;
}

header h1 {
    font-size: 1.8rem;
}

header nav a {
    margin-left: 1rem;
    text-decoration: none;
    color: black;
    transition: color 0.2s;
}

header nav a:hover {
    color: #3cb371; /* light green accent */
}

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 10px;
    padding: 2rem;
}

.gallery img {
    width: 100%;
    height: auto;
    cursor: pointer;
    transition: transform 0.3s;
}

.gallery img:hover {
    transform: scale(1.05);
}

.about {
    padding: 2rem;
    max-width: 800px;
    margin: auto;
    text-align: center;
}

/* LIGHTBOX MODAL */
#lightbox {
    position: fixed; /* stays over the whole viewport */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 999;
}

#lightbox.hidden {
    display: none;
}

#lightbox img {
    max-width: 90%;
    max-height: 90%;
    border: 4px solid white;
    box-shadow: 0 0 15px rgba(0,0,0,0.5);
}

#lightbox-close {
    position: absolute;
    top: 20px;
    right: 30px;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    user-select: none;
}

.invisible{
    opacity: 0;
}
.birthday-button {
    background: linear-gradient(45deg, #ff6b6b, #f7d94c);
    color: white;
    border: none;
    border-radius: 25px;
    padding: 15px 30px;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    text-align: center;
    text-decoration: none;
    display: inline-block;
}

.birthday-button:hover {
    transform: scale(1.1);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.birthday-button:active {
    transform: scale(0.95);
}