:root {
    --ui-background: rgba(255, 255, 255, 0.1);
    --text-color: #f0f0f0;
    --accent-color: #007aff;
    --border-color: rgba(255, 255, 255, 0.2);
    --slider-track: rgba(120, 120, 128, 0.2); 
    --slider-thumb: #ffffff;
    --animation-duration: 0.8s;
    --transition-timing-function: cubic-bezier(0.45, 0.05, 0.55, 0.95); 
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #111;
    color: var(--text-color);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    transition: background-color var(--animation-duration) ease; 
}


body.bg-black { background-color: #000; }
body.bg-white { background-color: #fff; }

#background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0;
    transition: opacity var(--animation-duration) ease; 
}
body.bg-blur #background-container {
    opacity: 1;
}

.background-image {
    position: absolute;
    top: -50px;
    left: -50px;
    width: calc(100vw + 100px);
    height: calc(100vh + 100px);
    background-size: cover; 
    background-position: center;
    filter: blur(25px) brightness(0.7); 
    opacity: 0;
    transition: opacity var(--animation-duration) ease-in-out; 
    z-index: 1;
}
.background-image.active {
    opacity: 1;
    z-index: 2;
}


#slideshow-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    
}

.slide-image {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%); 
    max-width: 100%;
    max-height: 100%;
    object-fit: contain; 
    
    opacity: 0;
    z-index: 1;
    transition: opacity var(--animation-duration) var(--transition-timing-function), 
                transform var(--animation-duration) var(--transition-timing-function);
}

.slide-image.active {
    opacity: 1;
    z-index: 10;
    transform: translate(-50%, -50%) scale(1); 
}


#slideshow-container.transition-slide .slide-image {
    transform: translate(-50%, -50%); 
}

#slideshow-container.transition-slide .slide-image.prepare {
    transform: translate(calc(100% + 50vw), -50%);
    opacity: 1; 
}

#slideshow-container.transition-slide .slide-image.active {
    transform: translate(-50%, -50%);
    z-index: 10;
}

#slideshow-container.transition-slide .slide-image.exiting {
    transform: translate(calc(-100% - 50vw), -50%);
    z-index: 9; 
}


#ui-controls {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}
#menu-toggle {
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    background-color: rgba(0, 0, 0, 0.3);
    opacity: 0.5;
    transition: opacity 0.3s ease;
}
#menu-toggle:hover {
    opacity: 1;
}
#menu-toggle svg {
    display: block;
    stroke: white; 
}
#settings-panel {
    position: absolute;
    top: 50px;
    right: 0;
    width: 280px;
    background: var(--ui-background);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    opacity: 0;
    transform: translateY(-10px);
    visibility: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}
#settings-panel.visible {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
}
.setting-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.setting-item label {
    font-size: 14px;
    font-weight: 500;
}
.options-group {
    position: relative; 
    display: flex;
    background-color: rgba(120, 120, 128, 0.2);
    border-radius: 8px;
    padding: 2px;
}
.options-group .highlight {
    position: absolute;
    top: 2px;
    left: 2px;
    height: calc(100% - 4px);
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 7px;
    z-index: 1;
    transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.options-group button {
    position: relative; 
    z-index: 2;
    flex: 1;
    padding: 6px 10px;
    border: none;
    background-color: transparent; 
    color: var(--text-color);
    font-size: 13px;
    border-radius: 7px;
    cursor: pointer;
    transition: color 0.3s ease;
}
.options-group button.active {
    background-color: transparent; 
    color: #333;
    font-weight: 600;
}
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 5px;
    background: var(--slider-track);
    border-radius: 5px;
    outline: none;
}
.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--slider-thumb);
    cursor: pointer;
    border-radius: 50%;
    border: 3px solid var(--accent-color);
    transition: transform 0.2s ease;
}
.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}
.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--slider-thumb);
    cursor: pointer;
    border-radius: 50%;
    border: 3px solid var(--accent-color);
    transition: transform 0.2s ease;
}
.slider::-moz-range-thumb:hover {
    transform: scale(1.1);
}
#music-options button {
    padding-top: 2px;
    padding-bottom: 2px;

    display: flex;
    align-items: center;
    justify-content: center;
}

#clock-container,
#logo-container {
    position: fixed;
    bottom: 30px;
    z-index: 50;
    display: flex;
    align-items: center; 
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

#clock-container.visible,
#logo-container.visible {
    opacity: 1;
    transform: translateY(0);
}

#clock-container {
    left: 30px;
    align-items: baseline; 
    gap: 0.5em;
    color: #ffffff;
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.5);
}

#clock-container.visible {
    opacity: 1;
    transform: translateY(0);
}

#clock-container .am-pm {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-weight: 300; 
    font-size: 2rem; 
    text-transform: uppercase;
}

#clock-container .time {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-weight: 100; 
    font-size: 4rem; 
    letter-spacing: 2px; 
}

#logo-container {
    right: 30px;
}

#logo-container img {
    height: 2rem; 
    width: auto; 
    object-fit: contain;
    filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.5)); 
}

.checkbox-group {
    display: flex;
    justify-content: space-between; 
    align-items: center;
}


.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
}

.checkbox-label input[type="checkbox"] {
    margin-right: 10px;
    appearance: none;
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: transparent;
    cursor: pointer;
    position: relative;
}

.checkbox-label input[type="checkbox"]:checked {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.checkbox-label input[type="checkbox"]:checked::after {
    content: '✔';
    position: absolute;
    color: white;
    font-size: 12px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}