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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    /* background: linear-gradient(135deg, #667eea 0%, #004466 100%); */
    background: #333333;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    text-align: center;
    color: white;
}

h1 {
    margin-bottom: 40px;
    font-size: 2.5em;
    font-weight: 300;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.slider-container {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
}

.slider {
    position: relative;
    width: 300px;
    height: 150px;
    background: var(--bg-color, #A8D8EA);
    border-radius: 75px;
    border: 8px solid #f0f0f0;
    box-shadow: 
        0 8px 32px rgba(0,0,0,0.3),
        inset 0 2px 8px rgba(255,255,255,0.3);
    overflow: hidden;
    cursor: pointer;
    transition: background 0.1s ease;
}

.slider.night-mode {
    border-color: #34495e;
}

/* Gradient layers as separate elements */
.slider::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle 80px at 25% 50%, #87CEEB 0%, #87CEEB 60%, transparent 100%),
        radial-gradient(circle 100px at 22% 50%, #98D8E8 0%, #98D8E8 50%, transparent 100%),
        radial-gradient(circle 120px at 20% 50%, #B0E0E6 0%, #B0E0E6 40%, transparent 100%),
        radial-gradient(circle 140px at 18% 50%, #C0E8F0 0%, #C0E8F0 30%, transparent 100%);
    opacity: 1;
    transition: all 0.8s ease;
    pointer-events: none;
}

.slider.night-mode::before {
    background: 
        radial-gradient(circle 80px at 75% 50%, #2c2c2c 0%, #2c2c2c 60%, transparent 100%),
        radial-gradient(circle 100px at 78% 50%, #3d3d3d 0%, #3d3d3d 50%, transparent 100%),
        radial-gradient(circle 120px at 80% 50%, #4a4a4a 0%, #4a4a4a 40%, transparent 100%),
        radial-gradient(circle 140px at 82% 50%, #5a5a5a 0%, #5a5a5a 30%, transparent 100%);
}

.background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

/* Clouds */
.cloud {
    position: absolute;
    background: white;
    border-radius: 50px;
    opacity: 0.95;
    transition: all 0.8s ease;
}

.cloud::before,
.cloud::after {
    content: '';
    position: absolute;
    background: white;
    border-radius: 50px;
}

/* Large cloud spanning left side bottom */
.cloud-1 {
    width: 120px;
    height: 40px;
    bottom: 15px;
    left: -20px;
    animation: float 8s ease-in-out infinite;
}

.cloud-1::before {
    width: 45px;
    height: 45px;
    top: -20px;
    left: 20px;
}

.cloud-1::after {
    width: 55px;
    height: 55px;
    top: -25px;
    right: 15px;
}

/* Medium cloud in center-bottom */
.cloud-2 {
    width: 80px;
    height: 30px;
    bottom: 20px;
    left: 80px;
    animation: float 10s ease-in-out infinite reverse;
}

.cloud-2::before {
    width: 35px;
    height: 35px;
    top: -15px;
    left: 15px;
}

.cloud-2::after {
    width: 40px;
    height: 40px;
    top: -18px;
    right: 10px;
}

/* Small cloud on right bottom */
.cloud-3 {
    width: 60px;
    height: 25px;
    bottom: 25px;
    right: -10px;
    animation: float 9s ease-in-out infinite;
}

.cloud-3::before {
    width: 25px;
    height: 25px;
    top: -10px;
    left: 10px;
}

.cloud-3::after {
    width: 30px;
    height: 30px;
    top: -12px;
    right: 8px;
}

.cloud {
    opacity: var(--cloud-opacity, 0.95);
    transition: opacity 0.1s ease, transform 0.1s ease;
}

.slider.night-mode .cloud {
    transform: translateY(30px);
}

/* Stars */
.stars {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: var(--star-opacity, 0);
    transition: opacity 0.1s ease;
}

.star {
    position: absolute;
    width: 3px;
    height: 3px;
    background: white;
    border-radius: 50%;
    animation: twinkle 2s ease-in-out infinite alternate;
}

.star::before {
    content: '';
    position: absolute;
    width: 1px;
    height: 8px;
    background: white;
    left: 1px;
    top: -2.5px;
}

.star::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 1px;
    background: white;
    left: -2.5px;
    top: 1px;
}

.star-1 { top: 20px; left: 50px; animation-delay: 0s; }
.star-2 { top: 35px; right: 60px; animation-delay: 0.3s; }
.star-3 { top: 60px; left: 30px; animation-delay: 0.6s; }
.star-4 { top: 80px; right: 40px; animation-delay: 0.9s; }
.star-5 { top: 45px; left: 80px; animation-delay: 1.2s; }
.star-6 { top: 25px; right: 90px; animation-delay: 1.5s; }
.star-7 { top: 70px; right: 80px; animation-delay: 1.8s; }
.star-8 { top: 90px; left: 70px; animation-delay: 2.1s; }

/* Slider Track - Hidden */
.slider-track {
    display: none;
}

/* Slider Knob */
.slider-knob {
    position: absolute;
    width: 90px;
    height: 90px;
    background: var(--knob-color, #FFD700);
    border-radius: 50%;
    top: 50%;
    left: 20px;
    transform: translateY(-50%);
    box-shadow: 
        0 4px 20px rgba(0,0,0,0.3),
        inset 0 2px 8px rgba(255,255,255,0.3);
    cursor: grab;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), left 0.6s cubic-bezier(0.4, 0, 0.2, 1), background 0.1s ease;
    z-index: 10;
}

.slider-knob:active {
    cursor: grabbing;
    transform: translateY(-50%) scale(1.05);
}



/* Sun */
.sun {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: inherit;
    opacity: var(--sun-opacity, 1);
    transition: opacity 0.1s ease, transform 0.1s ease;
}

.slider-knob.night-mode .sun {
    transform: scale(0.8);
}

/* Moon */
.moon {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    opacity: var(--moon-opacity, 0);
    transform: scale(0.8);
    transition: opacity 0.1s ease, transform 0.1s ease;
}

.slider-knob.night-mode .moon {
    transform: scale(1);
}

.crater {
    position: absolute;
    background: #A0A0A0;
    border-radius: 50%;
    transition: all 0.6s ease;
}

.crater-1 {
    width: 12px;
    height: 12px;
    top: 25px;
    left: 30px;
}

.crater-2 {
    width: 8px;
    height: 8px;
    top: 45px;
    right: 25px;
}

.crater-3 {
    width: 6px;
    height: 6px;
    bottom: 30px;
    left: 35px;
}

/* Animations */
@keyframes float {
    0%, 100% { transform: translateY(0px) translateX(0px); }
    25% { transform: translateY(-3px) translateX(2px); }
    50% { transform: translateY(-6px) translateX(0px); }
    75% { transform: translateY(-3px) translateX(-2px); }
}

@keyframes twinkle {
    0% { opacity: 0.3; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.2); }
}



.description {
    font-size: 1.2em;
    opacity: 0.9;
    font-weight: 300;
}

/* Responsive Design */
@media (max-width: 480px) {
    .slider {
        width: 250px;
        height: 125px;
        border-radius: 62.5px;
    }
    
    .slider-knob {
        width: 75px;
        height: 75px;
    }
    
    .slider-knob.night-mode {
        left: calc(100% - 95px);
    }
    
    h1 {
        font-size: 2em;
    }
}