/* Apple-Inspired CSS Variables */
:root {
    /* Apple Color System */
    --color-primary: #1D1D1F;        /* Apple's dark text */
    --color-secondary: #86868B;      /* Apple's secondary gray */
    --color-tertiary: #F5F5F7;       /* Apple's light background */
    --color-accent: #007AFF;         /* Apple's system blue */
    --color-accent-hover: #0056CC;   /* Darker blue for hover */
    --color-background: #FFFFFF;     /* Pure white background */
    --color-surface: #FBFBFD;        /* Subtle surface color */
    
    /* Apple Typography Scale */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    --font-size-hero: clamp(2.5rem, 5vw, 4rem);
    --font-size-h1: clamp(2rem, 4vw, 3rem);
    --font-size-h2: clamp(1.5rem, 3vw, 2.25rem);
    --font-size-h3: clamp(1.25rem, 2.5vw, 1.75rem);
    --font-size-body: 1.125rem;
    --font-size-small: 0.875rem;
    
    /* Apple Spacing System */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Apple Layout */
    --max-width: 1200px;
    --border-radius: 18px;
    --border-radius-small: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Apple Shadows */
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 25px 50px rgba(0, 0, 0, 0.15);
}

/* Apple-Inspired Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    line-height: 1.6;
    color: var(--color-primary);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Apple-Style Container System */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section-large {
    padding: calc(var(--spacing-3xl) * 1.5) 0;
}

/* Apple-Style Navigation Header */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    min-height: 44px;
}

.nav-brand {
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 400;
    font-size: var(--font-size-body);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-link.active {
    color: var(--color-accent);
    font-weight: 500;
}

/* Apple-Style Main Content & Typography */
main {
    background-color: var(--color-background);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-tertiary) 0%, var(--color-background) 100%);
    text-align: center;
    padding: var(--spacing-3xl) 0;
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero h1 {
    font-size: var(--font-size-hero);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero p {
    font-size: var(--font-size-h3);
    color: var(--color-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-weight: 400;
}

/* Section Styling */
section {
    padding: var(--spacing-3xl) 0;
    opacity: 0;
    transform: translateY(60px);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

section.slide-in {
    opacity: 1;
    transform: translateY(0);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-primary);
    line-height: 1.2;
}

h1 {
    font-size: var(--font-size-h1);
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: var(--font-size-h2);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

h3 {
    font-size: var(--font-size-h3);
    margin-bottom: var(--spacing-sm);
}

p {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    max-width: 65ch;
}

/* Apple-Style Cards */
.card {
    background: var(--color-background);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-light);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.card p {
    color: var(--color-secondary);
    font-size: var(--font-size-body);
}

/* Apple-Style Grid System */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Apple-Style Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-small);
    font-size: var(--font-size-body);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    min-width: 120px;
}

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

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.btn-secondary:hover {
    background: var(--color-accent);
    color: var(--color-background);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Apple-Style Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--color-primary);
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius-small);
    font-size: var(--font-size-body);
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

/* Authentication Form Styles */
.auth-tab {
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.auth-tab:hover {
    opacity: 0.8;
}

.auth-tab.active {
    background: var(--color-accent) !important;
    color: white !important;
}

/* Footer Styling */
.footer {
    background: var(--color-tertiary);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-3xl);
}

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

.footer-section h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.footer-section a {
    display: block;
    color: var(--color-secondary);
    text-decoration: none;
    margin-bottom: var(--spacing-xs);
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    color: var(--color-secondary);
    font-size: var(--font-size-small);
}

/* Special Love Box with Apple-inspired styling */
.love-box {
    background: linear-gradient(135deg, #FF6B9D 0%, #C44569 100%);
    border-radius: var(--border-radius);
    padding: var(--spacing-2xl);
    text-align: center;
    color: white;
    font-size: var(--font-size-h2);
    font-weight: 700;
    box-shadow: var(--shadow-large);
    margin: var(--spacing-3xl) 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    min-height: 200px;
}

.heart-icon {
    width: 48px;
    height: 48px;
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Games Page Specific Styles */

/* Featured Game Section */
.featured-section {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, #2c2c2e 100%);
    color: white;
}

.featured-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.featured-title {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff 0%, #a0a0a0 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.featured-description {
    font-size: 1.2rem;
    line-height: 1.6;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.featured-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-accent);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Game Preview */
.game-preview {
    perspective: 1000px;
}

.game-screen {
    background: #000;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transform: rotateY(-10deg) rotateX(5deg);
    transition: transform 0.3s ease;
}

.game-screen:hover {
    transform: rotateY(-5deg) rotateX(2deg);
}

.memory-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.memory-cell {
    aspect-ratio: 1;
    background: #333;
    border-radius: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.memory-cell.active {
    background: var(--color-accent);
    box-shadow: 0 0 20px rgba(0, 122, 255, 0.5);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.game-ui {
    display: flex;
    justify-content: space-between;
    color: #fff;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
}

/* Game Categories */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.category-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(0, 122, 255, 0.1) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.category-card:hover::before {
    opacity: 1;
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.category-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.category-card p {
    opacity: 0.7;
    margin-bottom: 1rem;
}

.game-count {
    color: var(--color-accent);
    font-weight: 500;
    font-size: 0.9rem;
}

/* Games Grid */
.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.game-card {
    background: var(--color-surface);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.game-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.game-thumbnail {
    height: 200px;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.game-thumbnail::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 0%, rgba(255, 255, 255, 0.1) 50%, transparent 100%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.game-card:hover .game-thumbnail::before {
    transform: translateX(100%);
}

.game-icon {
    font-size: 4rem;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.game-info {
    padding: 1.5rem;
}

.game-info h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.game-info p {
    opacity: 0.7;
    margin-bottom: 1rem;
}

.game-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.rating {
    color: var(--color-accent);
    font-weight: 500;
}

.plays {
    opacity: 0.7;
}

/* Responsive Design - Mobile First */
@media (max-width: 768px) {
    :root {
        --spacing-xs: 0.25rem;
        --spacing-sm: 0.5rem;
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
        --spacing-3xl: 3rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-links {
        gap: var(--spacing-lg);
    }
    
    .hero {
        padding: var(--spacing-2xl) 0;
        min-height: 50vh;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .love-box {
        font-size: var(--font-size-h3);
        padding: var(--spacing-xl);
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .featured-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .featured-stats {
        justify-content: center;
    }
    
    .game-screen {
        transform: none;
        max-width: 300px;
        margin: 0 auto;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .games-grid {
        grid-template-columns: 1fr;
    }
    
    .auth-form-container {
        padding: var(--spacing-lg);
        margin: var(--spacing-md);
    }
}

/* Animation for game cards */
.game-card {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
    transform: translateY(30px);
}

.game-card:nth-child(1) { animation-delay: 0.1s; }
.game-card:nth-child(2) { animation-delay: 0.2s; }
.game-card:nth-child(3) { animation-delay: 0.3s; }
.game-card:nth-child(4) { animation-delay: 0.4s; }
.game-card:nth-child(5) { animation-delay: 0.5s; }
.game-card:nth-child(6) { animation-delay: 0.6s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}