body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #111;
    font-family: 'Courier New', monospace;
}

.game-container {
    position: relative;
    width: 840px;
    height: 600px;
}

.screen {
    position: relative;
    background-color: #000;
    border: 4px solid #333;
    border-radius: 10px;
    padding: 20px;
    width: 800px;
    box-sizing: border-box;
    box-shadow: 
        0 0 10px #0f0,
        inset 0 0 20px rgba(0, 255, 0, 0.2);
    animation: flicker 0.15s infinite;
    overflow: hidden;
}

.play-area {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    border: 2px solid rgba(0, 255, 0, 0.3);
    pointer-events: none;
    z-index: 2;
}

.screen.shake {
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

.start-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #000;
    z-index: 3;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s;
}

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

.snake-logo {
    display: flex;
    margin-bottom: 100px;
    position: relative;
    transform-style: preserve-3d;
    animation: floatComplex 4s ease-in-out infinite;
}

.logo-segment {
    width: 40px;
    height: 40px;
    background-color: #0f0;
    margin: 3px;
    box-shadow: 0 0 15px #0f0;
    animation: pulse 2s infinite;
    position: relative;
    transform-origin: center;
}

.logo-segment:nth-child(1) { animation: headMove 2s infinite; }
.logo-segment:nth-child(2) { animation: segmentMove 2s infinite 0.2s; }
.logo-segment:nth-child(3) { animation: segmentMove 2s infinite 0.4s; }
.logo-segment:nth-child(4) { animation: segmentMove 2s infinite 0.6s; }
.logo-segment:nth-child(5) { animation: segmentMove 2s infinite 0.8s; }

.logo-segment.head {
    border-radius: 10px 40px 40px 10px;
}

.logo-segment.head::before {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    background: #000;
    border-radius: 50%;
    top: 8px;
    right: 8px;
    box-shadow: 0 0 8px #0f0;
    animation: eyeGlow 2s infinite;
}

.title {
    font-size: 72px;
    color: #0f0;
    text-shadow: 0 0 20px #0f0;
    margin-bottom: 60px;
    animation: titleFloat 3s ease-in-out infinite;
    letter-spacing: 8px;
    transform-style: preserve-3d;
}

.blink {
    animation: blink 1s steps(2) infinite;
    font-size: 28px;
    letter-spacing: 4px;
}

.crt-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        rgba(18, 16, 16, 0) 50%,
        rgba(0, 0, 0, 0.25) 50%
    );
    background-size: 100% 4px;
    z-index: 2;
    pointer-events: none;
}

canvas {
    background-color: #000;
    display: block;
    width: 760px;
    height: 460px;
    margin: 0 auto;
}

.score {
    color: #0f0;
    font-size: 24px;
    margin-top: 10px;
    text-shadow: 0 0 8px #0f0;
}

.message {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #0f0;
    font-size: 24px;
    text-shadow: 0 0 8px #0f0;
    text-align: center;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.message.visible {
    opacity: 1;
}

@keyframes flicker {
    0% { opacity: 0.97; }
    100% { opacity: 1; }
}

@keyframes shake {
    10%, 90% { transform: translate3d(-1px, 0, 0); }
    20%, 80% { transform: translate3d(2px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
    40%, 60% { transform: translate3d(4px, 0, 0); }
}

@keyframes floatComplex {
    0% { transform: translateY(0) rotate(0deg) scale(1); }
    25% { transform: translateY(-30px) rotate(3deg) scale(1.05); }
    50% { transform: translateY(0) rotate(-2deg) scale(1); }
    75% { transform: translateY(20px) rotate(3deg) scale(0.95); }
    100% { transform: translateY(0) rotate(0deg) scale(1); }
}

@keyframes titleFloat {
    0% { transform: translateY(0) rotateX(0deg); }
    50% { transform: translateY(-15px) rotateX(10deg); }
    100% { transform: translateY(0) rotateX(0deg); }
}

@keyframes headMove {
    0% { transform: rotate(0deg) scale(1); filter: brightness(1); }
    25% { transform: rotate(15deg) scale(1.2); filter: brightness(1.8); }
    50% { transform: rotate(0deg) scale(1); filter: brightness(1); }
    75% { transform: rotate(-15deg) scale(1.2); filter: brightness(1.8); }
    100% { transform: rotate(0deg) scale(1); filter: brightness(1); }
}

@keyframes segmentMove {
    0% { transform: translateY(0) scale(1); filter: brightness(1); }
    50% { transform: translateY(-10px) scale(1.1); filter: brightness(1.5); }
    100% { transform: translateY(0) scale(1); filter: brightness(1); }
}

@keyframes eyeGlow {
    0% { box-shadow: 0 0 8px #0f0; }
    50% { box-shadow: 0 0 16px #0f0; }
    100% { box-shadow: 0 0 8px #0f0; }
}

@keyframes pulse {
    0% { transform: scale(1); filter: brightness(1); }
    50% { transform: scale(1.1); filter: brightness(1.5); }
    100% { transform: scale(1); filter: brightness(1); }
}

@keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 0; }
    100% { opacity: 1; }
}

/* Add scanline effect */
.screen::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.15),
        rgba(0, 0, 0, 0.15) 1px,
        transparent 1px,
        transparent 2px
    );
    pointer-events: none;
    z-index: 1;
}