/* ================================ */
/* VM AUTOMOBILE - OVERLAY STYLES */
/* ================================ */

/* ================================ */
/* CSS CUSTOM PROPERTIES */
/* ================================ */
:root {
    /* Color Palette */
    --color-primary: crimson;
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-light: #444444;
    --color-gray-medium: #222222;
    --color-gray-dark: #111111;
    
    /* Background Colors */
    --bg-overlay: rgba(0, 0, 0, 1);
    --bg-section-1: #424242;
    --bg-section-2: #2b2b2b;
    --bg-section-3: #1b1b1b;
    --bg-section-4: #000000;
    
    /* Transitions */
    --transition-fast: 0.3s ease;
    --transition-medium: 0.4s ease;
    --transition-slow: 0.5s ease;
    
    /* Layout */
    --border-radius-small: 4px;
    --border-radius-circle: 50%;
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 15px;
    --spacing-lg: 20px;
    --spacing-xl: 50px;
    
    /* Typography */
    --font-family-primary: 'Cinzel', serif;
    --font-size-small: 1rem;
    --font-size-large: 1.2rem;
    --letter-spacing-wide: 1px;
    
    /* Z-index Stack */
    --z-overlay: 10000;
    
    /* Animation */
    --animation-duration: 0.4s;
    --blur-amount: 3px;
}

/* ================================ */
/* GLOBAL RESETS */
/* ================================ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body,
html {
    height: 100%;
    font-family: var(--font-family-primary);
}

/* ================================ */
/* OVERLAY CONTAINER */
/* ================================ */
.overlay {
    /* Layout */
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: var(--z-overlay);
    
    /* Display */
    display: flex;
    flex-direction: row;
    
    /* Styling */
    background-color: var(--bg-overlay);
    color: var(--color-white);
    
    /* Initial Hidden State */
    opacity: 0;
    transform: translateY(-30px);
    pointer-events: none;
    
    /* Animation */
    transition: 
        opacity var(--transition-slow),
        transform var(--transition-slow);
}

/* Overlay Active State */
.overlay.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

/* ================================ */
/* OVERLAY SECTIONS */
/* ================================ */

/* Base Section Styles */
.overlay-section {
    padding: var(--spacing-lg);
    border-right: 1px solid var(--color-gray-medium);
    
    /* Initial Hidden State */
    opacity: 0;
    transform: translateX(-20px);
    
    /* Animation */
    transition: 
        opacity var(--transition-slow),
        transform var(--transition-slow);
}

/* Section Layout Distribution */
.overlay-section:nth-child(1) {
    flex: 0.1; /* Logo Panel */
    background-color: var(--bg-section-1);
}

.overlay-section:nth-child(2) {
    flex: 0.9; /* Main Menu */
    background-color: var(--bg-section-2);
}

.overlay-section:nth-child(3) {
    flex: 1.2; /* Submenu */
    background-color: var(--bg-section-3);
}

.overlay-section:nth-child(4) {
    flex: 3; /* Image Display */
    background-color: var(--bg-section-4);
    border-right: none;
}

/* Section Active State */
.overlay.show .overlay-section {
    opacity: 1;
    transform: translateX(0);
}

/* ================================ */
/* LOGO PANEL */
/* ================================ */
.logo-section {
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.left-panel {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    gap: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    width: 100%;
}

.left-panel img {
    width: 50px;
    height: auto;
    object-fit: contain;
}

/* ================================ */
/* CLOSE BUTTON */
/* ================================ */
.close-btn {
    /* Layout */
    width: 40px;
    height: 40px;
    
    /* Styling */
    border: 2px solid var(--color-white);
    border-radius: var(--border-radius-circle);
    background: transparent;
    color: var(--color-white);
    
    /* Typography */
    font-size: var(--font-size-large);
    font-weight: bold;
    line-height: 1;
    
    /* Interactive */
    cursor: pointer;
    
    /* Layout */
    display: flex;
    align-items: center;
    justify-content: center;
    
    /* Animation */
    transition: 
        border-color var(--transition-fast),
        background-color var(--transition-fast),
        transform var(--transition-fast);
}

.close-btn:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary);
    transform: scale(1.05);
}

.close-btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.close-btn:active {
    transform: scale(0.95);
}

/* ================================ */
/* MAIN MENU SECTION */
/* ================================ */
.menu-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Menu Heading */
.menu-heading {
    font-size: var(--font-size-small);
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    margin-bottom: var(--spacing-lg);
    opacity: 0.8;
    padding-left: var(--spacing-xs);
    color: var(--color-white);
}

/* Menu Items */
.menu-title {
    /* Reset button styles */
    border: none;
    background: none;
    color: inherit;
    font: inherit;
    text-align: left;
    
    /* Styling */
    opacity: 0.5;
    cursor: pointer;
    position: relative;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-lg);
    
    /* Animation */
    transition: 
        opacity var(--transition-fast),
        color var(--transition-fast),
        font-weight var(--transition-fast);
}

.menu-title:hover,
.menu-title.selected {
    opacity: 1;
    font-weight: bold;
    color: var(--color-primary);
}

.menu-title:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Menu Item Arrow Indicator */
.menu-title::after {
    content: '>';
    position: absolute;
    right: 0;
    top: 0;
    padding-left: var(--spacing-xs);
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.menu-title:hover::after,
.menu-title.selected::after {
    opacity: 1;
}

/* ================================ */
/* SUBMENU SECTION */
/* ================================ */
.sub-menu-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Submenu Groups */
.submenu-group {
    /* Initial Hidden State */
    opacity: 0;
    transform: translateY(10px);
    filter: blur(var(--blur-amount));
    
    /* Animation */
    animation: fadeSlideUp var(--animation-duration) ease forwards;
    transition: all var(--transition-slow);
}

.submenu-group.show {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
}

/* Submenu Titles */
.submenu-title {
    opacity: 0.5;
    cursor: pointer;
    position: relative;
    padding-right: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    
    /* Animation */
    transition: 
        opacity var(--transition-fast),
        color var(--transition-fast);
}

.submenu-title:hover,
.submenu-title.active,
.submenu-title.expanded {
    opacity: 1;
    color: var(--color-primary);
}

.submenu-title:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Submenu Dropdown Arrows */
.submenu-title::after {
    content: '\25BC'; /* ▼ down arrow */
    position: absolute;
    right: 0;
    top: 0;
    padding-left: var(--spacing-xs);
    font-size: 0.8em;
    
    /* Animation */
    transition: transform var(--transition-fast);
}

.submenu-title.expanded::after {
    transform: rotate(180deg);
}

/* ================================ */
/* DROPDOWN OPTIONS */
/* ================================ */
.submenu-options {
    list-style: none;
    margin-left: var(--spacing-md);
    
    /* Initial Hidden State */
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    
    /* Animation */
    transition:
        max-height var(--transition-medium),
        opacity var(--transition-fast),
        transform var(--transition-fast);
}

/* Dropdown Active State */
.submenu-title.expanded + .submenu-options {
    max-height: 500px; /* Large enough for tallest submenu */
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

/* Dropdown Items */
.submenu-options li {
    opacity: 0.5;
    cursor: pointer;
    margin-bottom: 8px;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-small);
    
    /* Animation */
    transition: 
        opacity var(--transition-fast),
        color var(--transition-fast),
        background-color var(--transition-fast),
        font-weight var(--transition-fast);
}

.submenu-options li:hover,
.submenu-options li.selected {
    opacity: 1;
    font-weight: bold;
    color: var(--color-primary);
    background-color: rgba(220, 20, 60, 0.1);
}

.submenu-options li:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ================================ */
/* IMAGE DISPLAY PANEL */
/* ================================ */
.image-display {
    background-color: var(--color-gray-dark);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-light);
    font-size: var(--font-size-large);
    padding: var(--spacing-lg);
    text-align: center;
    
    /* Animation */
    transition: background-color var(--transition-slow);
}

.image-display:hover {
    background-color: #0a0a0a;
}

/* ================================ */
/* ANIMATIONS */
/* ================================ */
@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
        filter: blur(var(--blur-amount));
    }
    to {
        opacity: 1;
        transform: translateY(0);
        filter: blur(0);
    }
}

/* ================================ */
/* RESPONSIVE DESIGN */
/* ================================ */
@media (max-width: 1024px) {
    .overlay-section:nth-child(1) {
        flex: 0.15;
    }
    
    .overlay-section:nth-child(2) {
        flex: 1;
    }
    
    .overlay-section:nth-child(3) {
        flex: 1.5;
    }
    
    .overlay-section:nth-child(4) {
        flex: 2.5;
    }
}

@media (max-width: 768px) {
    .overlay {
        flex-direction: column;
    }
    
    .overlay-section {
        border-right: none;
        border-bottom: 1px solid var(--color-gray-medium);
    }
    
    .overlay-section:nth-child(1) {
        flex: 0.1;
    }
    
    .overlay-section:nth-child(2) {
        flex: 0.3;
    }
    
    .overlay-section:nth-child(3) {
        flex: 0.4;
    }
    
    .overlay-section:nth-child(4) {
        flex: 0.2;
        border-bottom: none;
    }
    
    .left-panel {
        flex-direction: row;
        justify-content: space-between;
        padding: var(--spacing-sm);
    }
    
    .menu-heading {
        font-size: 0.9rem;
    }
    
    .menu-title {
        padding: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .overlay-section {
        padding: var(--spacing-sm);
    }
    
    .close-btn {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }
    
    .left-panel img {
        width: 40px;
    }
}

/* ================================ */
/* ACCESSIBILITY ENHANCEMENTS */
/* ================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #ff6b6b;
        --color-white: #ffffff;
        --color-black: #000000;
        --color-gray-light: #666666;
    }
    
    .overlay-section {
        border-right-width: 2px;
    }
    
    .close-btn {
        border-width: 3px;
    }
}

/* Focus visible support */
.overlay-section:focus-visible,
.menu-title:focus-visible,
.submenu-title:focus-visible,
.submenu-options li:focus-visible,
.close-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ================================ */
/* UTILITY CLASSES */
/* ================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.no-transition {
    transition: none !important;
    animation: none !important;
}

/* ================================ */
/* PERFORMANCE OPTIMIZATIONS */
/* ================================ */
.overlay-section {
    will-change: transform, opacity;
}

.submenu-group {
    will-change: transform, opacity, filter;
}

/* GPU acceleration for smooth animations */
.overlay,
.overlay-section,
.submenu-group {
    transform: translateZ(0);

}