/* === CSS Variables === */
:root {
    --color-primary: hsl(240, 100%, 67%);
    --color-secondary: hsl(330, 85%, 65%);
    --color-accent: hsl(45, 100%, 60%);
    --color-success: hsl(120, 60%, 50%);
    
    --color-text: hsl(220, 15%, 20%);
    --color-text-muted: hsl(220, 10%, 45%);
    --color-bg: hsl(220, 40%, 98%);
    --color-surface: hsl(220, 30%, 96%);
    --color-border: hsl(220, 20%, 88%);
    
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.1);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Dark Mode === */
[data-theme="dark"] {
    --color-text: hsl(220, 15%, 85%);
    --color-text-muted: hsl(220, 10%, 65%);
    --color-bg: hsl(220, 20%, 8%);
    --color-surface: hsl(220, 15%, 12%);
    --color-border: hsl(220, 15%, 20%);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
}

/* === Typography === */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.025em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

/* === Layout === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

/* === Header === */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    transition: var(--transition);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
}

.nav-links a:hover {
    background: var(--color-surface);
    color: var(--color-primary);
}

.theme-toggle {
    background: none;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: var(--transition);
}

.theme-toggle:hover {
    border-color: var(--color-primary);
    transform: rotate(180deg);
}

/* === Hero Section === */
.hero {
    padding: var(--space-2xl) 0;
    text-align: center;
    background: linear-gradient(135deg, 
        var(--color-bg) 0%, 
        var(--color-surface) 50%, 
        var(--color-bg) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, var(--color-primary), transparent 50%),
                radial-gradient(circle at 70% 80%, var(--color-secondary), transparent 50%);
    opacity: 0.05;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* === Cards === */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

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

.card-header {
    margin-bottom: var(--space-md);
}

.card-title {
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.card-meta {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.card-content {
    margin-bottom: var(--space-md);
}

.card-footer {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.card-image {
    width: calc(100% + 2 * var(--space-lg));
    height: 200px;
    object-fit: cover;
    object-position: center;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    margin: calc(-1 * var(--space-lg)) 0 var(--space-md) calc(-1 * var(--space-lg));
}

/* === Featured Works === */
.featured-work {
    background: linear-gradient(135deg, var(--color-surface), var(--color-bg));
    border: 2px solid var(--color-primary);
    position: relative;
    overflow: hidden;
}

/* === Tech Stack === */
.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.tech-tag {
    background: var(--color-primary);
    color: white;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
}

.tech-tag.secondary {
    background: var(--color-text-muted);
}

/* === Timeline === */
.timeline {
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-left: var(--space-2xl);
    margin-bottom: var(--space-xl);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 14px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 3px solid var(--color-bg);
}

/* === Stats === */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    text-align: center;
    margin: var(--space-xl) 0;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    display: block;
}

.stat-label {
    color: var(--color-text-muted);
    font-weight: 500;
}

/* === Games Section === */
.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.game-card {
    background: linear-gradient(135deg, var(--color-surface), var(--color-bg));
    border: 2px solid var(--color-accent);
    text-align: center;
}

.game-card:hover {
    border-color: var(--color-primary);
}

.game-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

/* === Footer === */
.footer {
    background: var(--color-surface);
    padding: var(--space-xl) 0 var(--space-lg);
    margin-top: var(--space-2xl);
    border-top: 1px solid var(--color-border);
}

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

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.social-links a {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--color-primary);
}

/* === Responsive === */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

/* === Animations === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* === Scroll Animations === */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}