/* CSS Variables - Design Tokens */
:root {
    /* Colors */
    --primary-color: #2b5da3;
    --primary-color-dark: #234b82;
    --text-primary: #333;
    --text-secondary: #666;
    --background-light: #F2F3F5;
    --white: #fff;
    --error-bg: #f8d7da;
    --error-border: #f5c6cb;
    --error-text: #721c24;
    --warning-bg: #fff3cd;
    --warning-border: #ffeeba;
    --warning-text: #856404;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-primary: 0 2px 4px rgba(43, 93, 163, 0.2);

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 50%;

    /* Typography */
    --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-size-sm: 0.9rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.1rem;

    /* Z-index layers */
    --z-base: 1;
    --z-overlay: 100;
    --z-modal: 1000;
    --z-highest: 9999;

    /* Transitions */
    --transition-speed: 0.5s;
}

/* Reset & Base Styles */
* {
    font-family: var(--font-family-base) !important;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    min-height: 100vh;
    pointer-events: auto;
}

/* Layout Components */
.branding {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--background-light);
    padding: var(--spacing-md) 0;
    text-align: center;
    z-index: var(--z-overlay);
}

.logo {
    height: 30px;
    width: auto;
}

#ar-scene-container {
    position: fixed;
    inset: 0;
    z-index: var(--z-base);
}

/* Loading Component */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: var(--z-modal);
    transition: opacity var(--transition-speed) ease;
}

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

.loading-content {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    max-width: 80%;
    box-shadow: var(--shadow-md);
}

.loading-overlay.timeout .loading-content {
    cursor: pointer;
    transition: transform 0.2s ease;
}

.loading-overlay.timeout .loading-content:hover {
    transform: scale(0.98);
}

/* Loading Indicators */
.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary-color);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #f3f3f3;
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin: var(--spacing-md) 0;
}

.progress-fill {
    width: 0%;
    height: 100%;
    background: var(--primary-color);
    transition: width var(--transition-speed) ease;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 1.5s infinite;
}

/* Typography Styles */
.loading-text {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.loading-subtext {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    max-width: 280px;
    margin: 0 auto;
}

/* Message Components */
.loading-error,
.ar-compatibility-message {
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.loading-error {
    color: var(--error-text);
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    box-shadow: var(--shadow-sm);
    display: none;
}

.ar-compatibility-message {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
    color: var(--warning-text);
    text-align: center;
}

.ar-compatibility-message.error {
    background: var(--error-bg);
    border-color: var(--error-border);
    color: var(--error-text);
}

/* AR Components */
.ar-instructions {
    text-align: center;
    margin-top: var(--spacing-md);
    padding: var(--spacing-lg);
    background: #f8f9fa;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.ar-instructions p {
    margin: 0;
    line-height: 1.5;
}

.ar-instructions .note {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
    font-style: italic;
}

/* Button Styles */
#ar-button-container {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 320px;
    text-align: center;
    z-index: var(--z-highest);
}

#ar-quicklook {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: var(--white);
    padding: 12px 24px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    transition: background-color var(--transition-speed) ease;
    box-shadow: var(--shadow-primary);
    width: 100%;
}

#ar-quicklook:hover {
    background: var(--primary-color-dark);
}

#ar-button-svg {
    margin-right: var(--spacing-sm);
    width: 24px;
    height: 24px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm-5-9h10v2H7z'/%3E%3C/svg%3E");
}

/* Three.js AR Button */
#ARButton,
button.ar-button {
    position: fixed !important;
    bottom: 24px !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    width: 90% !important;
    padding: 12px 6px !important;
    border-radius: 25px !important;
    border: none !important;
    background: var(--primary-color) !important;
    color: var(--white) !important;
    font-weight: bold !important;
    font-size: var(--font-size-base) !important;
    opacity: 1 !important;
    box-shadow: var(--shadow-md) !important;
    transition: all var(--transition-speed) ease !important;
    cursor: pointer !important;
    white-space: nowrap !important;
}

/* Container Components */
#webxr-container {
    position: fixed;
    bottom: 40px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: var(--z-highest);
    pointer-events: auto;
    min-height: 60px;
}

#debug-info {
    position: fixed;
    bottom: 10px;
    left: 10px;
    background: rgba(0,0,0,0.7);
    color: var(--white);
    padding: var(--spacing-md);
    font-family: monospace;
    font-size: var(--font-size-sm);
    z-index: 998;
    pointer-events: none;
}

#debug-panel {
    max-width: 90%;
    word-wrap: break-word;
}

/* Interactive Elements */
button, 
a, 
#webxr-container, 
.branding {
    pointer-events: auto !important;
}

/* Animations */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Media Queries */
@media (max-width: 768px) {
    .loading-content {
        padding: var(--spacing-lg);
        max-width: 90%;
    }

    #ar-button-container {
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 1.5rem;
        --spacing-lg: 1.25rem;
    }

    .loading-text {
        font-size: var(--font-size-base);
    }
}