/* ===== KLONDIKE TURN ONE SOLITAIRE - RESPONSIVE STYLES ===== */

/* CSS Variables - Fluid Design System */
:root {
    /* Colors */
    --color-primary: #2a623d;
    --color-primary-light: #3a7a5d;
    --color-primary-dark: #1d4729;
    --color-background: #2a623d;
    --color-text: #333;
    --color-text-light: #666;
    --color-white: #ffffff;
    --color-border: #e5e7eb;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Typography - Fluid scaling */
    --font-family-primary: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: clamp(0.75rem, 2vw, 0.875rem);
    --font-size-sm: clamp(0.875rem, 2.5vw, 1rem);
    --font-size-base: clamp(1rem, 3vw, 1.125rem);
    --font-size-lg: clamp(1.125rem, 3.5vw, 1.25rem);
    --font-size-xl: clamp(1.25rem, 4vw, 1.5rem);
    --font-size-2xl: clamp(1.5rem, 5vw, 2rem);
    --font-size-3xl: clamp(2rem, 6vw, 3rem);
    
    /* Spacing - Fluid scaling with viewport units */
    --spacing-xs: clamp(0.25rem, 1vw, 0.5rem);
    --spacing-sm: clamp(0.5rem, 2vw, 1rem);
    --spacing-md: clamp(1rem, 3vw, 1.5rem);
    --spacing-lg: clamp(1.5rem, 4vw, 2.5rem);
    --spacing-xl: clamp(2rem, 5vw, 4rem);
    --spacing-2xl: clamp(3rem, 6vw, 6rem);
    
    /* Layout - Responsive dimensions */
    --container-padding: clamp(1rem, 4vw, 2rem);
    --max-width-content: min(65ch, 90vw);
    --max-width-layout: min(1200px, 95vw);
    
    /* Interactive elements */
    --border-radius: clamp(0.5rem, 1vw, 0.75rem);
    --border-radius-lg: clamp(0.75rem, 1.5vw, 1rem);
    --touch-target-min: 44px; /* Minimum touch target size */
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-base: 0.2s ease-in-out;
    --transition-slow: 0.3s ease-in-out;
    
    /* Game-specific responsive variables */
    --card-scale: clamp(0.6, 8vw, 1);
    --game-padding: clamp(0.5rem, 2vw, 1rem);
    --ui-button-height: clamp(36px, 8vw, 48px);
}

/* Reset & Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px; /* Base font size for rem calculations */
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    background: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
    overflow: hidden; /* Prevents scrollbars during gameplay */
    -webkit-text-size-adjust: 100%; /* Prevent iOS text size adjustment */
    -webkit-tap-highlight-color: transparent; /* Remove tap highlight on mobile */
    touch-action: manipulation; /* Improve touch responsiveness */
}

/* Canvas Styles - Fully responsive */
canvas {
    display: block;
    cursor: default;
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 10;
    touch-action: none; /* Prevent default touch behaviors */
    user-select: none; /* Prevent text selection */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

/* Layout Utilities */
.container {
    max-width: var(--max-width-layout);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    width: 100%;
}

/* ===== GAME HEADER STYLES ===== */
.game-header {
    background: var(--color-white);
    padding: var(--spacing-md) 0 var(--spacing-xl);
    position: relative;
    z-index: 5;
    display: none; /* Hidden by default to prevent flash */
}

.game-header.hidden {
    display: none;
}

.breadcrumb {
    font-size: 14px;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
}

.breadcrumb a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition-base);
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.game-header h1 {
    font-size: var(--font-size-3xl);
    color: var(--color-primary);
    margin: 0 0 var(--spacing-xs) 0;
    font-weight: 600;
}

.game-description {
    font-size: var(--font-size-xl);
    color: var(--color-text-light);
    margin: 0 0 var(--spacing-lg) 0;
    line-height: 1.6;
}

.loading-content h2 {
    color: var(--color-primary);
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.loading-content p {
    font-size: var(--font-size-lg);
    line-height: 1.6;
    color: var(--color-text-light);
}

/* ===== GAME INSTRUCTIONS STYLES ===== */
.game-instructions {
    background: var(--color-white);
    padding: var(--spacing-xl) 0;
    position: relative;
    z-index: 5;
    display: none; /* Hidden by default to prevent flash */
}

.game-instructions.hidden {
    position: absolute;
    top: -9999px;
    left: -9999px;
    visibility: hidden;
}

.instructions h2 {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* Rules Grid Layout */
.rules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.rule-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: var(--border-radius-lg);
    border-left: 4px solid var(--color-primary);
    transition: var(--transition-base);
}

.rule-section:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.rule-section h3 {
    color: var(--color-primary);
    font-size: 1.3rem;
    margin: 0 0 var(--spacing-sm) 0;
    font-weight: 600;
}

.rule-section p, 
.rule-section ul {
    margin: 0;
    line-height: 1.6;
    color: var(--color-text);
}

.rule-section ul {
    padding-left: var(--spacing-md);
}

.rule-section li {
    margin-bottom: var(--spacing-xs);
}

/* Game Features Section */
.game-features h3 {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin: 0 0 var(--spacing-md) 0;
    text-align: center;
    font-weight: 600;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.feature {
    text-align: center;
    padding: var(--spacing-md);
    background: #f0f7f0;
    border-radius: var(--border-radius);
    transition: var(--transition-base);
}

.feature:hover {
    transform: translateY(-2px);
    background: #e8f5e8;
}

.feature strong {
    display: block;
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.feature p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.4;
}

/* Game Variants Section */
.game-variants {
    background: #f8f9fa;
    padding: 25px;
    border-radius: var(--border-radius-lg);
    margin-top: var(--spacing-lg);
}

.game-variants h3 {
    color: var(--color-primary);
    margin: 0 0 var(--spacing-sm) 0;
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.game-variants ul {
    margin: 0;
    padding-left: var(--spacing-md);
    list-style-type: none;
}

.game-variants li {
    margin-bottom: var(--spacing-xs);
    position: relative;
    padding-left: var(--spacing-sm);
}

.game-variants li:before {
    content: "♠";
    color: var(--color-primary);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.game-variants a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-base);
}

.game-variants a:hover {
    text-decoration: underline;
    color: var(--color-primary-light);
}

/* ===== RESPONSIVE DESIGN - MOBILE FIRST ===== */

/* Extra Small Devices - Phones (portrait) */
@media (max-width: 480px) {
    body {
        overflow: auto; /* Allow scrolling on very small screens */
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .game-header h1 {
        font-size: var(--font-size-2xl);
        line-height: 1.2;
    }
    
    .game-description {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-md);
    }
    
    .loading-content h2 {
        font-size: var(--font-size-xl);
    }
    
    .loading-content p {
        font-size: var(--font-size-sm);
    }
    
    .instructions h2 {
        font-size: var(--font-size-xl);
        margin-bottom: var(--spacing-md);
    }
    
    .rules-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .rule-section {
        padding: var(--spacing-sm);
        border-radius: var(--border-radius);
    }
    
    .rule-section h3 {
        font-size: var(--font-size-lg);
        margin-bottom: var(--spacing-xs);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .feature {
        padding: var(--spacing-sm);
    }
    
    .feature strong {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-xs);
    }
    
    .game-variants {
        padding: var(--spacing-md);
        margin-top: var(--spacing-md);
    }
    
    .game-variants h3 {
        font-size: var(--font-size-lg);
    }
}

/* Small Devices - Phones (landscape) and Small Tablets */
@media (min-width: 481px) and (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .rules-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .rule-section {
        padding: var(--spacing-md);
    }
}

/* Medium Devices - Tablets */
@media (min-width: 769px) and (max-width: 1024px) {
    .rules-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
}

/* Large Devices - Desktops */
@media (min-width: 1025px) {
    .rules-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
    
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-lg);
    }
}

/* Ultra-wide Displays */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
    }
}

/* Landscape Orientation on Mobile */
@media (max-height: 600px) and (orientation: landscape) {
    .game-header {
        padding: var(--spacing-sm) 0;
    }
    
    .loading-content h2 {
        font-size: var(--font-size-lg);
        margin-bottom: var(--spacing-xs);
    }
    
    .loading-content p {
        font-size: var(--font-size-sm);
    }
    
    .breadcrumb {
        font-size: var(--font-size-xs);
        margin-bottom: var(--spacing-xs);
    }
}

/* ===== ACCESSIBILITY & USABILITY ENHANCEMENTS ===== */

/* Reduced Motion Preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #000000;
        --color-text: #000000;
        --color-background: #ffffff;
    }
    
    .rule-section {
        border-left-width: 6px;
        border: 2px solid var(--color-primary);
    }
    
    .feature {
        border: 3px solid var(--color-primary);
    }
    
    canvas {
        border: 2px solid var(--color-primary);
    }
}

/* Focus Management for Keyboard Navigation */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--border-radius);
}

/* Remove outline for mouse users but keep for keyboard users */
a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
    outline: none;
}

/* Touch-friendly Interactive Elements */
@media (pointer: coarse) {
    /* Increase touch targets for touch devices */
    a, button, [role="button"] {
        min-height: var(--touch-target-min);
        min-width: var(--touch-target-min);
        padding: var(--spacing-sm);
    }
    
    /* Larger text for better readability on touch devices */
    body {
        font-size: var(--font-size-lg);
    }
}

/* Print Styles */
@media print {
    * {
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }
    
    .game-header,
    .game-instructions {
        display: block !important;
        position: static !important;
        visibility: visible !important;
    }
    
    canvas {
        display: none !important;
    }
    
    body {
        overflow: visible !important;
        background: white !important;
        color: black !important;
    }
    
    .container {
        max-width: none !important;
        padding: 0 !important;
    }
    
    .game-header {
        page-break-inside: avoid;
    }
    
    .rule-section {
        page-break-inside: avoid;
        break-inside: avoid;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-background: #1a2332;
        --color-text: #e2e8f0;
        --color-text-light: #a0aec0;
        --color-white: #2d3748;
        --color-border: #4a5568;
    }
    
    .rule-section {
        background: #2d3748;
        color: var(--color-text);
    }
    
    .feature {
        background: #2d3748;
        color: var(--color-text);
    }
    
    .game-variants {
        background: #2d3748;
        color: var(--color-text);
    }
}

/* Performance Optimizations */
canvas {
    will-change: transform; /* Optimize for animations */
    image-rendering: crisp-edges; /* Sharp pixel art rendering */
    image-rendering: -webkit-crisp-edges;
    image-rendering: pixelated;
}

/* Prevent iOS zoom on input focus */
@media screen and (max-width: 768px) {
    input[type="text"],
    input[type="email"],
    input[type="tel"],
    input[type="password"],
    select,
    textarea {
        font-size: 16px !important; /* Prevents zoom on iOS */
    }
}

/* Safe area support for devices with notches */
@supports (padding: max(0px)) {
    .container {
        padding-left: max(var(--container-padding), env(safe-area-inset-left));
        padding-right: max(var(--container-padding), env(safe-area-inset-right));
    }
    
    .game-header {
        padding-top: max(var(--spacing-md), env(safe-area-inset-top));
    }
}

/* Game-specific responsive utilities */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Loading state optimization */
.game-loading {
    pointer-events: none;
    user-select: none;
}

/* Landscape warning for very small screens */
@media (max-height: 400px) and (max-width: 736px) and (orientation: landscape) {
    body::before {
        content: "For the best experience, please rotate your device to portrait mode or use a larger screen.";
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        background: var(--color-warning);
        color: white;
        text-align: center;
        padding: var(--spacing-xs);
        font-size: var(--font-size-xs);
        z-index: 9999;
        font-weight: 600;
    }
}