/* ========================================
   CSS VARIABLES & RESET
   ======================================== */
:root {
    /* Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #151515;
    --bg-tertiary: #1f1f1f;
    --accent-primary: #00d9ff;
    --accent-secondary: #ff00e5;
    --accent-gradient: linear-gradient(135deg, #00d9ff 0%, #ff00e5 100%);
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-tertiary: #707070;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 30px 80px rgba(0, 0, 0, 0.7);
    
    /* Typography */
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Syne', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Z-index */
    --z-canvas: 1;
    --z-ui: 10;
    --z-panel: 100;
    --z-loader: 1000;
}

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

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    position: fixed;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   LOADING SCREEN
   ======================================== */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: var(--z-loader);
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-content {
    text-align: center;
}

.loader-spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loader-text {
    font-family: var(--font-display);
    font-size: 1rem;
    letter-spacing: 0.2em;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.loader-progress {
    width: 200px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto var(--spacing-xs);
}

.loader-progress-bar {
    height: 100%;
    background: var(--accent-gradient);
    width: 0%;
    transition: width 0.3s ease;
}

.loader-percent {
    font-family: var(--font-display);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ========================================
   3D CANVAS
   ======================================== */
#canvas3d {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-canvas);
    outline: none;
    touch-action: none;
}

/* ========================================
   HEADER
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: var(--z-ui);
    background: linear-gradient(180deg, rgba(10, 10, 10, 0.9) 0%, transparent 100%);
    pointer-events: none;
}

.header > * {
    pointer-events: auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: 0.1em;
    color: var(--text-primary);
}

.logo svg {
    color: var(--accent-primary);
}

.header-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.icon-btn {
    width: 44px;
    height: 44px;
    border: none;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.icon-btn:active {
    transform: translateY(0);
}

/* ========================================
   COLOR INFO DISPLAY
   ======================================== */
.color-info {
    position: fixed;
    top: 100px;
    left: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    z-index: var(--z-ui);
    transition: all 0.3s ease;
}

.color-info-swatch {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: #888;
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.color-info-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.color-info-name {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.color-info-type {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ========================================
   MOBILE PANEL TOGGLE
   ======================================== */
.panel-toggle {
    position: fixed;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent-gradient);
    border: none;
    border-radius: 50px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.875rem;
    letter-spacing: 0.1em;
    color: var(--text-primary);
    cursor: pointer;
    display: none;
    align-items: center;
    gap: var(--spacing-xs);
    z-index: var(--z-ui);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.panel-toggle:active {
    transform: translateX(-50%) scale(0.95);
}

.toggle-icon {
    transition: transform 0.3s ease;
}

.panel-toggle.active .toggle-icon {
    transform: rotate(180deg);
}

/* ========================================
   COLOR SELECTOR PANEL
   ======================================== */
.color-panel {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    width: 400px;
    max-width: 100%;
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: blur(40px);
    border-left: 1px solid var(--border-color);
    z-index: var(--z-panel);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.panel-header {
    padding: var(--spacing-lg) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.panel-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.panel-close {
    width: 36px;
    height: 36px;
    border: none;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
    display: none;
}

.panel-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Search Bar */
.search-container {
    position: relative;
    padding: var(--spacing-md);
}

.search-icon {
    position: absolute;
    left: calc(var(--spacing-md) + 12px);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 14px 14px 14px 42px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--text-primary);
    outline: none;
    transition: all 0.3s ease;
}

.search-input:focus {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent-primary);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    gap: var(--spacing-xs);
    padding: 0 var(--spacing-md) var(--spacing-md);
    overflow-x: auto;
    scrollbar-width: none;
}

.filter-tabs::-webkit-scrollbar {
    display: none;
}

.filter-tab {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.3s ease;
}

.filter-tab:hover {
    background: rgba(255, 255, 255, 0.08);
}

.filter-tab.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: var(--text-primary);
}

/* Color Grid */
.color-grid {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: var(--spacing-sm);
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

.color-grid::-webkit-scrollbar {
    width: 8px;
}

.color-grid::-webkit-scrollbar-track {
    background: transparent;
}

.color-grid::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

.color-swatch {
    aspect-ratio: 1;
    border-radius: 12px;
    cursor: pointer;
    position: relative;
    border: 2px solid transparent;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.color-swatch:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.color-swatch:active {
    transform: translateY(-2px) scale(1.02);
}

.color-swatch.selected {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(0, 217, 255, 0.2);
}

.color-swatch::after {
    content: attr(data-name);
    position: absolute;
    bottom: -28px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 8px;
    background: rgba(0, 0, 0, 0.9);
    border-radius: 6px;
    font-size: 0.625rem;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: 10;
}

.color-swatch:hover::after {
    opacity: 1;
}

/* Custom Color Picker */
.custom-color {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.custom-color-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
}

#customColorPicker {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    background: transparent;
}

#customColorPicker::-webkit-color-swatch-wrapper {
    padding: 0;
}

#customColorPicker::-webkit-color-swatch {
    border: 2px solid var(--border-color);
    border-radius: 12px;
}

/* ========================================
   ENVIRONMENT SELECTOR MODAL
   ======================================== */
.environment-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: calc(var(--z-panel) + 10);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.environment-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 900px;
    max-height: 85vh;
    background: rgba(20, 20, 20, 0.95);
    backdrop-filter: blur(40px);
    border-radius: 24px;
    border: 1px solid var(--border-color);
    padding: var(--spacing-xl);
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.environment-modal.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.modal-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-close {
    width: 40px;
    height: 40px;
    border: none;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(90deg);
}

.environment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-md);
}

.environment-card {
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.environment-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 217, 255, 0.2);
}

.environment-card.active {
    border-color: var(--accent-primary);
    background: rgba(0, 217, 255, 0.1);
    box-shadow: 0 0 0 4px rgba(0, 217, 255, 0.2);
}

.env-preview {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    position: relative;
    overflow: hidden;
}

.env-preview svg {
    color: rgba(255, 255, 255, 0.9);
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

.env-info h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.env-info p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ========================================
   STATS (OPTIONAL)
   ======================================== */
.stats {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    color: var(--text-secondary);
    z-index: var(--z-ui);
    display: none;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

/* Tablets */
@media (max-width: 1024px) {
    .color-panel {
        width: 360px;
    }
    
    .color-info {
        left: var(--spacing-sm);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .color-info-swatch {
        width: 40px;
        height: 40px;
    }
    
    .color-info-name {
        font-size: 0.875rem;
    }
}

/* Mobile Devices */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
    }
    
    .header {
        padding: var(--spacing-sm);
    }
    
    .logo span {
        display: none;
    }
    
    .icon-btn {
        width: 40px;
        height: 40px;
    }
    
    /* Hide color info on mobile */
    .color-info {
        display: none;
    }
    
    /* Show panel toggle */
    .panel-toggle {
        display: flex;
    }
    
    /* Panel slides up from bottom */
    .color-panel {
        top: auto;
        right: 0;
        left: 0;
        bottom: 0;
        width: 100%;
        max-height: 75vh;
        border-left: none;
        border-top: 1px solid var(--border-color);
        border-radius: 24px 24px 0 0;
        transform: translateY(100%);
    }
    
    .color-panel.open {
        transform: translateY(0);
    }
    
    .panel-close {
        display: flex;
    }
    
    .panel-header {
        padding: var(--spacing-md);
    }
    
    .panel-title {
        font-size: 1.125rem;
    }
    
    .search-container {
        padding: 0 var(--spacing-md) var(--spacing-md);
    }
    
    .filter-tabs {
        padding: 0 var(--spacing-md) var(--spacing-md);
    }
    
    .color-grid {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
        gap: 12px;
        padding: var(--spacing-md);
    }
    
    .custom-color {
        padding: var(--spacing-md);
    }
    
    /* Environment Modal Mobile */
    .modal-content {
        width: 95%;
        max-height: 80vh;
        padding: var(--spacing-md);
    }
    
    .modal-title {
        font-size: 1.125rem;
    }
    
    .environment-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 12px;
    }
    
    .environment-card {
        padding: 12px;
    }
    
    .env-info h3 {
        font-size: 0.875rem;
    }
    
    .env-info p {
        font-size: 0.75rem;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .color-grid {
        grid-template-columns: repeat(auto-fill, minmax(55px, 1fr));
        gap: 10px;
    }
    
    .logo {
        font-size: 1rem;
    }
    
    .panel-toggle {
        bottom: var(--spacing-sm);
        padding: 12px 20px;
        font-size: 0.8125rem;
    }
}

/* Landscape Mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .color-panel {
        max-height: 90vh;
    }
    
    .panel-toggle {
        bottom: var(--spacing-xs);
    }
}

/* Desktop Large */
@media (min-width: 1440px) {
    .color-panel {
        width: 450px;
    }
    
    .color-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.color-swatch {
    animation: fadeIn 0.3s ease backwards;
}

.color-swatch:nth-child(n) {
    animation-delay: calc(var(--index, 0) * 0.01s);
}

/* ========================================
   TOUCH OPTIMIZATIONS
   ======================================== */
@media (hover: none) {
    .color-swatch:hover::after {
        opacity: 0;
    }
    
    .icon-btn:hover,
    .filter-tab:hover,
    .panel-close:hover {
        background: rgba(255, 255, 255, 0.05);
        transform: none;
    }
    
    /* Increase tap targets */
    .color-swatch {
        min-height: 48px;
    }
}

/* Prevent text selection during interactions */
.color-panel,
.color-grid,
.filter-tabs,
#canvas3d {
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
}

/* Smooth scrolling */
.color-grid,
.filter-tabs {
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}