:root{--color-neon-blue: #00bcd4;--color-neon-pink: #ff007f;--color-dark-bg: #121212;--color-light-text: #e0e0e0}body{margin:0;padding:0;box-sizing:border-box;font-family:Arial,sans-serif;background-color:var(--color-dark-bg);color:var(--color-light-text);overflow-x:hidden}.intro-screen{min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:20px}.intro-title{font-size:4em;margin-bottom:.5em;font-weight:900;text-transform:uppercase}.intro-subtitle{font-size:1.5em;margin-bottom:2em;color:var(--color-light-text)}.neon-text{color:#fff;text-shadow:0 0 7px #fff,0 0 10px #fff,0 0 21px var(--color-neon-blue),0 0 42px var(--color-neon-blue),0 0 82px var(--color-neon-blue),0 0 92px var(--color-neon-blue),0 0 102px var(--color-neon-blue),0 0 151px var(--color-neon-blue)}.start-button{background:var(--color-neon-pink);color:var(--color-dark-bg);border:none;padding:15px 30px;font-size:1.2em;font-weight:700;cursor:pointer;border-radius:5px;transition:all .3s ease-in-out;text-transform:uppercase;box-shadow:0 0 5px var(--color-neon-pink),0 0 25px var(--color-neon-pink),0 0 50px var(--color-neon-pink),0 0 100px var(--color-neon-pink)}.start-button:hover{background:#fff;color:#121212;box-shadow:0 0 10px var(--color-neon-blue),0 0 40px var(--color-neon-blue),0 0 80px var(--color-neon-blue);transform:scale(1.05)}.celebration-container{padding:40px 20px;text-align:center;min-height:100vh}.gallery-title{font-size:2.5em;margin-bottom:40px}.photo-gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:30px;margin-bottom:50px}.photo-card{background-color:#1f1f1f;border-radius:10px;padding:15px;box-shadow:0 0 10px #00000080;transition:transform .3s ease;border:1px solid #333}.photo-card:hover{transform:translateY(-5px);box-shadow:0 0 15px var(--color-neon-pink)}.gallery-image{width:100%;height:250px;object-fit:cover;border-radius:8px;margin-bottom:15px}.message-button{background-color:var(--color-neon-blue);color:var(--color-dark-bg);border:none;padding:10px 15px;font-size:1em;cursor:pointer;border-radius:5px;transition:background-color .3s,box-shadow .3s;width:100%;font-weight:700}.message-button:hover,.active-button{background-color:var(--color-neon-pink);color:#fff;box-shadow:0 0 10px var(--color-neon-pink)}.message-display{background-color:#1f1f1f;border:2px solid var(--color-neon-blue);padding:30px;margin-top:40px;border-radius:12px;min-height:150px;display:flex;align-items:center;justify-content:center;text-align:center;animation:fadeIn 1s ease-out}.revealed-message{font-size:1.5em;line-height:1.6;color:var(--color-light-text)}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.back-button{position:absolute;top:20px;left:20px;background:transparent;color:var(--color-neon-blue);border:2px solid var(--color-neon-blue);padding:10px 15px;font-size:1em;cursor:pointer;border-radius:5px;transition:all .3s ease;font-weight:700;z-index:10}.back-button:hover{background-color:var(--color-neon-blue);color:var(--color-dark-bg);box-shadow:0 0 10px var(--color-neon-blue);transform:translate(-5px)}.celebration-container{position:relative;padding:40px 20px;text-align:center;min-height:100vh}