:root {
    --bg-color: #050505;
    --primary-glow: #00f3ff;
    --secondary-glow: #bc13fe;
    --text-color: #ffffff;
    --font-main: 'Outfit', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none; /* Let clicks pass through to canvas when playing */
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 1s ease;
    pointer-events: none;
}

.screen.active {
    opacity: 1;
    pointer-events: all;
}

/* Start Screen */
.title {
    font-size: 5rem;
    font-weight: 900;
    letter-spacing: 10px;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, #aaa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.2);
    animation: pulseTitle 3s infinite ease-in-out;
}

.subtitle {
    font-size: 1.2rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 3rem;
    letter-spacing: 2px;
}

button {
    padding: 1rem 3rem;
    font-size: 1rem;
    font-family: var(--font-main);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: white;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.1);
}

button:hover {
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 40px rgba(0, 243, 255, 0.3);
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.3);
}

/* End Screen */
.hello-container {
    display: flex;
    perspective: 1000px;
}

.letter {
    font-size: 6rem;
    font-weight: 900;
    color: white;
    opacity: 0;
    transform: translateY(50px) rotateX(90deg);
    display: inline-block;
    text-shadow: 0 0 20px var(--primary-glow), 0 0 40px var(--secondary-glow);
}

.spacer {
    width: 2rem;
}

.screen.active .letter {
    animation: revealLetter 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    animation-delay: var(--delay);
}

#replay-btn {
    margin-top: 3rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease 2s; /* Delay appearance */
}

.screen.active #replay-btn {
    opacity: 1;
    transform: translateY(0);
}

@keyframes pulseTitle {
    0%, 100% { opacity: 0.8; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.02); text-shadow: 0 0 50px rgba(255, 255, 255, 0.4); }
}

@keyframes revealLetter {
    0% {
        opacity: 0;
        transform: translateY(50px) rotateX(90deg);
        filter: blur(10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0) rotateX(0deg);
        filter: blur(0);
    }
}

@media (max-width: 768px) {
    .title { font-size: 3rem; }
    .letter { font-size: 3rem; }
}