:root {
    /* Colors */
    --color-bg: #000;
    --color-text: #fff;
    --color-text-muted: rgba(255, 255, 255, 0.7);
    --color-btn-bg: transparent;
    --color-btn-border: transparent;
    --color-btn-hover: transparent;
    --color-btn-text: rgba(255, 255, 255, 0.7);
    --color-btn-primary-bg: rgba(255, 255, 255, 0.15);
    --color-btn-primary-hover: rgba(255, 255, 255, 0.25);
    --color-btn-primary-text: #fff;
    --color-overlay: rgba(0, 0, 0, 0.2);
    --color-dialog-bg: rgba(30, 30, 30, 0.75);
    --color-dialog-backdrop: rgba(0, 0, 0, 0.4);
    
    /* Spacing */
    --spacing-sm: 5px;
    --spacing-md: 10px;
    --spacing-lg: 20px;
    
    /* Sizes */
    --size-btn: 44px;
    --size-icon: 24px;
    --size-dialog-min-width: 300px;
    
    /* Typography */
    --font-family-base: system-ui, sans-serif;
    --font-size-base: 16px;
    --font-size-lg: 1.5rem;
    --font-size-clock: 8rem;
    --font-weight-bold: bold;
    
    /* Visuals */
    --radius-base: 5px;
    --blur-base: 5px;
    --blur-dialog: 15px;
    --opacity-disabled: 0.3;
    --shadow-dialog: 0 4px 30px rgba(0, 0, 0, 0.5);
    
    /* Transitions */
    --transition-base: 0.3s;
    --transition-fast: 0.1s;
    
    /* Z-Index */
    --z-index-overlay: 1;
    --z-index-clock: 5;
    --z-index-content: 10;
    --z-index-dialog: 20;
}

/* --- UI Components --- */
.btn {
    background-color: var(--color-btn-bg);
    color: var(--color-btn-text);
    border: none;
    border-radius: var(--radius-base);
    cursor: pointer;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    font-family: inherit;
    font-size: var(--font-size-base);
    transition: background-color var(--transition-fast);
    /* backdrop-filter: blur(var(--blur-base)); */
}

.btn:hover:not(:disabled) {
    background-color: var(--color-btn-hover);
}

.btn-primary {
    background-color: var(--color-btn-primary-bg);
    color: var(--color-btn-primary-text);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-btn-primary-hover);
}

.btn:disabled {
    opacity: var(--opacity-disabled);
    cursor: not-allowed;
}

.btn-icon {
    width: var(--size-btn);
    height: var(--size-btn);
    padding: 0;
}

.btn-icon svg {
    width: var(--size-icon);
    height: var(--size-icon);
}

.btn-text {
    padding: var(--spacing-sm) var(--spacing-md);
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-bg);
    overflow: hidden;
}

#image-container {
    width: 100vw;
    height: 100vh;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    cursor: grab;
}

#overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-overlay);
    z-index: var(--z-index-overlay);
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

#overlay.active {
    opacity: 1;
}

#controls {
    position: absolute;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    z-index: var(--z-index-content);
}


#clock {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--color-text-muted);
    font-size: var(--font-size-clock);
    font-weight: var(--font-weight-bold);
    font-family: var(--font-family-base);
    z-index: var(--z-index-clock);
    pointer-events: none;
}

#image-info {
    position: absolute;
    bottom: var(--spacing-lg);
    left: var(--spacing-lg);
    color: var(--color-text);
    z-index: var(--z-index-content);
    pointer-events: none;
    max-width: 60%;
    font-family: var(--font-family-base);
}

#user-name {
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-muted);
}

#description {
    color: var(--color-text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Settings UI */
#settings-dialog {
    background-color: var(--color-dialog-bg);
    color: var(--color-text);
    border: 1px solid var(--color-btn-border);
    border-radius: var(--radius-base);
    padding: var(--spacing-lg);
    backdrop-filter: blur(var(--blur-dialog)); /* Glassmorphism effect */
    box-shadow: var(--shadow-dialog);
    min-width: var(--size-dialog-min-width);
    font-family: var(--font-family-base);
}

#settings-dialog::backdrop {
    background-color: var(--color-dialog-backdrop);
    backdrop-filter: blur(var(--blur-base));
}

#settings-form h2 {
    margin-top: 0;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group-row {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
}

.form-checkbox {
    width: var(--font-size-base);
    height: var(--font-size-base);
    cursor: pointer;
    accent-color: var(--color-text-muted);
}

.form-range {
    cursor: pointer;
    accent-color: var(--color-text-muted);
    flex: 1;
    margin-left: var(--spacing-md);
}

.form-select {
    padding: var(--spacing-sm);
    background: var(--color-btn-bg);
    color: var(--color-text);
    border: 1px solid var(--color-btn-border);
    border-radius: var(--radius-base);
    font-size: var(--font-size-base);
    outline: none;
    cursor: pointer;
}

.form-select option,
.form-select optgroup {
    background: var(--color-bg);
    color: var(--color-text);
}

.dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

/* Analog Clock */
#clock.analog {
    width: min(40vw, 40vh);
    height: min(40vw, 40vh);
    min-width: 200px;
    min-height: 200px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    /* Other properties like absolute position are inherited from #clock */
    text-shadow: none; /* override text clock style */
}

#clock.analog[data-face="current"] {
    border: 2px solid var(--color-text-muted);
}

#clock.analog .mark {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    font-size: 1.5rem;
    color: var(--color-text-muted);
}

#clock.analog .mark span {
    display: inline-block;
    padding-top: 10px;
}

#clock.analog .face-lines span {
    width: 4px;
    height: 15px;
    background-color: var(--color-text-muted);
    border-radius: 2px;
    padding-top: 0;
    margin-top: 10px;
}

#clock.analog .face-dots span {
    width: 8px;
    height: 8px;
    background-color: var(--color-text-muted);
    border-radius: 50%;
    padding-top: 0;
    margin-top: 10px;
}

#clock.analog .mark-1 { transform: rotate(30deg); }
#clock.analog .face-numbers.mark-1 span, #clock.analog .face-roman.mark-1 span { transform: rotate(-30deg); }
#clock.analog .mark-2 { transform: rotate(60deg); }
#clock.analog .face-numbers.mark-2 span, #clock.analog .face-roman.mark-2 span { transform: rotate(-60deg); }
#clock.analog .mark-3 { transform: rotate(90deg); }
#clock.analog .face-numbers.mark-3 span, #clock.analog .face-roman.mark-3 span { transform: rotate(-90deg); }
#clock.analog .mark-4 { transform: rotate(120deg); }
#clock.analog .face-numbers.mark-4 span, #clock.analog .face-roman.mark-4 span { transform: rotate(-120deg); }
#clock.analog .mark-5 { transform: rotate(150deg); }
#clock.analog .face-numbers.mark-5 span, #clock.analog .face-roman.mark-5 span { transform: rotate(-150deg); }
#clock.analog .mark-6 { transform: rotate(180deg); }
#clock.analog .face-numbers.mark-6 span, #clock.analog .face-roman.mark-6 span { transform: rotate(-180deg); }
#clock.analog .mark-7 { transform: rotate(210deg); }
#clock.analog .face-numbers.mark-7 span, #clock.analog .face-roman.mark-7 span { transform: rotate(-210deg); }
#clock.analog .mark-8 { transform: rotate(240deg); }
#clock.analog .face-numbers.mark-8 span, #clock.analog .face-roman.mark-8 span { transform: rotate(-240deg); }
#clock.analog .mark-9 { transform: rotate(270deg); }
#clock.analog .face-numbers.mark-9 span, #clock.analog .face-roman.mark-9 span { transform: rotate(-270deg); }
#clock.analog .mark-10 { transform: rotate(300deg); }
#clock.analog .face-numbers.mark-10 span, #clock.analog .face-roman.mark-10 span { transform: rotate(-300deg); }
#clock.analog .mark-11 { transform: rotate(330deg); }
#clock.analog .face-numbers.mark-11 span, #clock.analog .face-roman.mark-11 span { transform: rotate(-330deg); }
#clock.analog .mark-12 { transform: rotate(360deg); }
#clock.analog .face-numbers.mark-12 span, #clock.analog .face-roman.mark-12 span { transform: rotate(-360deg); }

#clock.analog .clock-face {
    position: relative;
    width: 100%;
    height: 100%;
}

#clock.analog .hand {
    position: absolute;
    top: 50%;
    left: 50%;
    background: var(--color-text);
    transform-origin: 0% 50%;
    border-radius: 4px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
    /* Transition for smooth ticking */
    transition: transform 0.05s cubic-bezier(0.1, 2.7, 0.58, 1);
}

#clock.analog .hour-hand {
    width: 25%;
    height: 6px;
    margin-top: -3px; /* vertical center alignment */
}

#clock.analog .min-hand {
    width: 35%;
    height: 4px;
    margin-top: -2px;
}

#clock.analog .second-hand {
    width: 40%;
    height: 2px;
    background: var(--color-text-muted);
    margin-top: -1px;
}

#clock.analog .center-dot {
    width: 12px;
    height: 12px;
    background: var(--color-text);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

#clock.analog.no-shadow .hand,
#clock.analog.no-shadow .center-dot {
    box-shadow: none;
}

/* Calendar */
#calendar {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    color: var(--color-text);
    z-index: var(--z-index-content);
    font-family: var(--font-family-base);
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.8);
    width: 220px;
    pointer-events: none;
    user-select: none;
}

.calendar-header {
    text-align: right;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
    padding-right: 5px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    text-align: center;
}

.calendar-day-name {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    margin-bottom: 4px;
}

.calendar-day {
    font-size: 0.9rem;
    padding: 4px 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calendar-day.today {
    color: var(--color-text);
    width: 24px;
    height: 24px;
    margin: 0 auto;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calendar-day.other-month {
    color: var(--color-text-muted);
    opacity: 0.6;
}

#calendar.no-shadow {
    text-shadow: none;
}