/* ========================================
   Design System & CSS Variables
   ======================================== */
:root {
    /* Color Palette - Vibrant Gaming Theme */
    --color-primary: hsl(270, 80%, 60%);
    --color-primary-light: hsl(270, 80%, 70%);
    --color-primary-dark: hsl(270, 80%, 50%);
    
    --color-secondary: hsl(195, 100%, 55%);
    --color-secondary-light: hsl(195, 100%, 65%);
    
    --color-accent: hsl(330, 100%, 60%);
    --color-accent-light: hsl(330, 100%, 70%);
    
    --color-success: hsl(145, 75%, 50%);
    --color-warning: hsl(40, 95%, 55%);
    
    /* Dark Theme Colors */
    --color-bg-primary: hsl(240, 15%, 8%);
    --color-bg-secondary: hsl(240, 15%, 12%);
    --color-bg-tertiary: hsl(240, 15%, 16%);
    
    --color-surface: hsla(240, 15%, 18%, 0.7);
    --color-surface-hover: hsla(240, 15%, 22%, 0.85);
    
    --color-text-primary: hsl(0, 0%, 95%);
    --color-text-secondary: hsl(0, 0%, 70%);
    --color-text-tertiary: hsl(0, 0%, 50%);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
    --gradient-card: linear-gradient(135deg, hsla(240, 15%, 18%, 0.9) 0%, hsla(240, 15%, 22%, 0.9) 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px hsla(0, 0%, 0%, 0.2);
    --shadow-md: 0 4px 16px hsla(0, 0%, 0%, 0.3);
    --shadow-lg: 0 8px 32px hsla(0, 0%, 0%, 0.4);
    --shadow-xl: 0 16px 48px hsla(0, 0%, 0%, 0.5);
    
    --shadow-glow: 0 0 20px hsla(270, 80%, 60%, 0.4);
    --shadow-glow-accent: 0 0 30px hsla(330, 100%, 60%, 0.5);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Typography */
    --font-primary: 'Outfit', 'Noto Sans SC', sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 600;
    --font-weight-bold: 700;
    --font-weight-black: 800;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Blur Effects */
    --blur-sm: blur(8px);
    --blur-md: blur(16px);
    --blur-lg: blur(24px);
}

/* ========================================
   Global Styles & Reset
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* ========================================
   Background Effects
   ======================================== */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
    top: -250px;
    left: -250px;
    animation-delay: 0s;
}

.orb-2 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%);
    bottom: -300px;
    right: -300px;
    animation-delay: -7s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--color-secondary) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(100px, -100px) scale(1.1);
    }
    66% {
        transform: translate(-100px, 100px) scale(0.9);
    }
}

/* ========================================
   Layout Container
   ======================================== */
.container {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* ========================================
   Header Section
   ======================================== */
.header {
    margin-bottom: var(--spacing-2xl);
    animation: fadeInDown 0.8s ease-out;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    font-size: 4rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.site-title {
    font-size: 2.5rem;
    font-weight: var(--font-weight-black);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

.site-subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.game-count {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--gradient-card);
    backdrop-filter: var(--blur-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid hsla(0, 0%, 100%, 0.1);
    box-shadow: var(--shadow-md);
}

.count-number {
    font-size: 3rem;
    font-weight: var(--font-weight-black);
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.count-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
}

/* ========================================
   Section Header
   ======================================== */
.section-header {
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.section-title {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.filter-tags {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.tag-button {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-surface);
    backdrop-filter: var(--blur-sm);
    border: 1px solid hsla(0, 0%, 100%, 0.1);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-family: var(--font-primary);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);
}

.tag-button:hover {
    background: var(--color-surface-hover);
    border-color: hsla(0, 0%, 100%, 0.2);
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

.tag-button.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-glow);
}

/* ========================================
   Games Grid
   ======================================== */
.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.game-card {
    position: relative;
    background: var(--gradient-card);
    backdrop-filter: var(--blur-md);
    border: 1px solid hsla(0, 0%, 100%, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    overflow: hidden;
}

.game-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        hsla(270, 80%, 60%, 0.1) 0%, 
        hsla(330, 100%, 60%, 0.1) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.game-card:hover {
    transform: translateY(-8px);
    border-color: hsla(0, 0%, 100%, 0.2);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

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

.game-card-header {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.game-icon {
    font-size: 3.5rem;
    filter: drop-shadow(0 4px 8px hsla(0, 0%, 0%, 0.3));
    transition: transform var(--transition-base);
}

.game-card:hover .game-icon {
    transform: scale(1.1) rotate(5deg);
}

.game-title-section {
    flex: 1;
}

.game-title {
    position: relative;
    z-index: 1;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
}

.game-title-en {
    position: relative;
    z-index: 1;
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    font-weight: var(--font-weight-medium);
}

.game-description {
    position: relative;
    z-index: 1;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.game-footer {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.game-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.game-tag {
    padding: 0.25rem 0.75rem;
    background: hsla(0, 0%, 100%, 0.1);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    border: 1px solid hsla(0, 0%, 100%, 0.05);
}

.game-difficulty {
    padding: 0.25rem 0.75rem;
    background: hsla(145, 75%, 50%, 0.2);
    border: 1px solid hsla(145, 75%, 50%, 0.3);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--color-success);
    font-weight: var(--font-weight-medium);
}

.game-difficulty.medium {
    background: hsla(40, 95%, 55%, 0.2);
    border-color: hsla(40, 95%, 55%, 0.3);
    color: var(--color-warning);
}

.game-difficulty.hard {
    background: hsla(0, 85%, 60%, 0.2);
    border-color: hsla(0, 85%, 60%, 0.3);
    color: hsl(0, 85%, 60%);
}

/* ========================================
   Empty State
   ======================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    animation: fadeIn 0.8s ease-out;
}

.empty-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.empty-state p {
    color: var(--color-text-secondary);
    font-size: 1rem;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
    border-top: 1px solid hsla(0, 0%, 100%, 0.05);
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .site-title {
        font-size: 2rem;
    }
    
    .logo-icon {
        font-size: 3rem;
    }
    
    .count-number {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .games-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .game-count {
        align-self: center;
    }
}

@media (max-width: 480px) {
    .site-title {
        font-size: 1.5rem;
    }
    
    .game-card {
        padding: var(--spacing-md);
    }
    
    .game-icon {
        font-size: 2.5rem;
    }
    
    .game-title {
        font-size: 1.25rem;
    }
}