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

body {
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    height: 100vh;
    width: 100vw;
    background: #000;
}

.sky-container {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    transition: background 3s ease-in-out;
    background: linear-gradient(to bottom, #87CEEB 0%, #E0F6FF 100%);
}

.celestial-body {
    position: absolute;
    border-radius: 50%;
    z-index: 10;
    transition: opacity 2s ease-in-out, transform 0.1s linear;
    transform: translate(-50%, -50%);
}

.sun {
    width: 100px;
    height: 100px;
    background: radial-gradient(circle at 30% 30%, #FFF9C4 0%, #FFD700 50%, #FFA500 100%);
    box-shadow: 0 0 60px rgba(255, 215, 0, 0.9), 0 0 100px rgba(255, 165, 0, 0.5);
    opacity: 0;
}

.moon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #F5F5F5 0%, #E8E8E8 50%, #C0C0C0 100%);
    box-shadow: 
        0 0 30px rgba(255, 255, 255, 0.6),
        inset -20px -20px 0 rgba(0, 0, 0, 0.1);
    opacity: 0;
}

.moon::before {
    content: '';
    position: absolute;
    width: 15px;
    height: 15px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 50%;
    top: 20%;
    left: 30%;
    box-shadow: 
        25px 15px 0 -3px rgba(0, 0, 0, 0.15),
        10px 35px 0 -2px rgba(0, 0, 0, 0.1),
        45px 40px 0 -4px rgba(0, 0, 0, 0.12);
}

.stars-container {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 5;
    opacity: 0;
    transition: opacity 3s ease-in-out;
    pointer-events: none;
}

.star {
    position: absolute;
    width: 2px;
    height: 2px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 0 4px rgba(255, 255, 255, 0.8);
}

.star.large {
    width: 3px;
    height: 3px;
    box-shadow: 0 0 6px rgba(255, 255, 255, 0.9);
}

.star.medium {
    width: 2.5px;
    height: 2.5px;
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.85);
}

@keyframes twinkle {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.5);
    }
}

.star {
    animation: twinkle 3s infinite;
}

.clouds-container {
    position: absolute;
    width: 100%;
    height: 60%;
    top: 0;
    left: 0;
    z-index: 8;
    pointer-events: none;
    opacity: 0.8;
    transition: opacity 2s ease-in-out;
}

.cloud {
    position: absolute;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50px;
    filter: blur(1px);
}

.cloud::before,
.cloud::after {
    content: '';
    position: absolute;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50px;
}

.cloud-small {
    width: 80px;
    height: 30px;
}

.cloud-small::before {
    width: 35px;
    height: 35px;
    top: -15px;
    left: 15px;
}

.cloud-small::after {
    width: 40px;
    height: 40px;
    top: -20px;
    right: 15px;
}

.cloud-medium {
    width: 120px;
    height: 45px;
}

.cloud-medium::before {
    width: 50px;
    height: 50px;
    top: -20px;
    left: 20px;
}

.cloud-medium::after {
    width: 60px;
    height: 60px;
    top: -25px;
    right: 20px;
}

.cloud-large {
    width: 180px;
    height: 60px;
}

.cloud-large::before {
    width: 70px;
    height: 70px;
    top: -30px;
    left: 25px;
}

.cloud-large::after {
    width: 80px;
    height: 80px;
    top: -35px;
    right: 25px;
}

@keyframes moveCloud {
    0% {
        transform: translateX(-250px);
    }
    100% {
        transform: translateX(calc(100vw + 250px));
    }
}

.info-display {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 15px 20px;
    border-radius: 10px;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    min-width: 180px;
}

.info-item {
    margin: 8px 0;
    font-size: 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.info-label {
    font-weight: bold;
    margin-right: 15px;
}

.footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    text-align: center;
    padding: 15px;
    z-index: 200;
    font-size: 14px;
    backdrop-filter: blur(10px);
}

.sky-spring {
    background: linear-gradient(to bottom, #87CEEB 0%, #B8E6B8 50%, #E0F6FF 100%);
}

.sky-spring.dawn {
    background: linear-gradient(to bottom, #FF6B6B 0%, #FFD93D 25%, #FFA500 40%, #87CEEB 70%, #E0F6FF 100%);
}

.sky-spring.day {
    background: linear-gradient(to bottom, #87CEEB 0%, #B8E6B8 50%, #E0F6FF 100%);
}

.sky-spring.dusk {
    background: linear-gradient(to bottom, #FF6B6B 0%, #FFD93D 25%, #FFA500 40%, #87CEEB 70%, #191970 100%);
}

.sky-spring.night {
    background: linear-gradient(to bottom, #191970 0%, #000033 50%, #000000 100%);
}

.sky-summer {
    background: linear-gradient(to bottom, #4A90E2 0%, #87CEEB 50%, #FFE4B5 100%);
}

.sky-summer.dawn {
    background: linear-gradient(to bottom, #FF8C42 0%, #FFB347 25%, #FFD700 40%, #4A90E2 70%, #87CEEB 100%);
}

.sky-summer.day {
    background: linear-gradient(to bottom, #4A90E2 0%, #87CEEB 50%, #FFE4B5 100%);
}

.sky-summer.dusk {
    background: linear-gradient(to bottom, #FF8C42 0%, #FFB347 25%, #FFD700 40%, #4A90E2 70%, #1a1a2e 100%);
}

.sky-summer.night {
    background: linear-gradient(to bottom, #1a1a2e 0%, #0a0a1a 50%, #000000 100%);
}

.sky-autumn {
    background: linear-gradient(to bottom, #FF8C42 0%, #FFB347 50%, #D2691E 100%);
}

.sky-autumn.dawn {
    background: linear-gradient(to bottom, #FF4500 0%, #FF8C42 25%, #FFA500 40%, #FF8C42 70%, #FFB347 100%);
}

.sky-autumn.day {
    background: linear-gradient(to bottom, #FF8C42 0%, #FFB347 50%, #D2691E 100%);
}

.sky-autumn.dusk {
    background: linear-gradient(to bottom, #FF4500 0%, #FF8C42 25%, #FFA500 40%, #FF8C42 70%, #2d1b1b 100%);
}

.sky-autumn.night {
    background: linear-gradient(to bottom, #2d1b1b 0%, #1a0f0f 50%, #000000 100%);
}

.sky-winter {
    background: linear-gradient(to bottom, #708090 0%, #B0C4DE 50%, #E6E6FA 100%);
}

.sky-winter.dawn {
    background: linear-gradient(to bottom, #FF6347 0%, #FFA500 25%, #FFD700 40%, #708090 70%, #B0C4DE 100%);
}

.sky-winter.day {
    background: linear-gradient(to bottom, #708090 0%, #B0C4DE 50%, #E6E6FA 100%);
}

.sky-winter.dusk {
    background: linear-gradient(to bottom, #FF6347 0%, #FFA500 25%, #FFD700 40%, #708090 70%, #1a1a2e 100%);
}

.sky-winter.night {
    background: linear-gradient(to bottom, #1a1a2e 0%, #0f0f1a 50%, #000000 100%);
}

@media (max-width: 768px) {
    .sun {
        width: 80px;
        height: 80px;
    }
    
    .moon {
        width: 60px;
        height: 60px;
    }
    
    .info-display {
        top: 10px;
        right: 10px;
        padding: 12px 15px;
        font-size: 12px;
        min-width: 150px;
    }
    
    .footer {
        font-size: 12px;
        padding: 12px;
    }
    
    .cloud-small {
        width: 60px;
        height: 25px;
    }
    
    .cloud-medium {
        width: 100px;
        height: 35px;
    }
    
    .cloud-large {
        width: 150px;
        height: 50px;
    }
}

@media (max-width: 480px) {
    .sun {
        width: 60px;
        height: 60px;
    }
    
    .moon {
        width: 50px;
        height: 50px;
    }
    
    .info-display {
        top: 5px;
        right: 5px;
        padding: 10px 12px;
        font-size: 11px;
        min-width: 130px;
    }
    
    .info-item {
        margin: 5px 0;
        font-size: 11px;
    }
    
    .footer {
        font-size: 11px;
        padding: 10px;
    }
    
    .cloud-small {
        width: 50px;
        height: 20px;
    }
    
    .cloud-medium {
        width: 80px;
        height: 30px;
    }
    
    .cloud-large {
        width: 120px;
        height: 40px;
    }
}