/* ============================================
   CSS Variables for Theme Support
   ============================================ */
:root {
    /* Light theme (default) */
    --color-bg: #fafafa;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f0f0f0;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-accent: #ff6b35;
    --color-accent-hover: #ff8555;
    --color-border: #e0e0e0;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-overlay: rgba(0, 0, 0, 0.05);
    
    /* Typography */
    --font-display: 'Outfit', 'Montserrat', sans-serif;
    --font-body: 'IBM Plex Sans', 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

[data-theme="dark"] {
    --color-bg: #0a0a0a;
    --color-bg-secondary: #141414;
    --color-bg-tertiary: #1e1e1e;
    --color-text: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-accent: #ff6b35;
    --color-accent-hover: #ff8555;
    --color-border: #2a2a2a;
    --color-shadow: rgba(0, 0, 0, 0.5);
    --color-overlay: rgba(255, 255, 255, 0.05);
}

/* ============================================
   Font Imports
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;600;700;800&family=IBM+Plex+Sans:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============================================
   Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ============================================
   Theme Toggle Button
   ============================================ */
.theme-toggle {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 1000;
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px var(--color-shadow);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(10deg);
    border-color: var(--color-accent);
}

.theme-toggle svg {
    position: absolute;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

[data-theme="light"] .sun-icon {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="light"] .moon-icon {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .sun-icon {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="dark"] .moon-icon {
    opacity: 1;
    transform: rotate(0deg);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: 
        linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-tertiary) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 150%;
    height: 150%;
    background: 
        radial-gradient(circle at 20% 50%, var(--color-accent) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, var(--color-accent) 0%, transparent 50%);
    opacity: 0.05;
    animation: heroGradient 20s ease infinite;
}

@keyframes heroGradient {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-10%, -10%) scale(1.1); }
}

.hero-content {
    text-align: center;
    z-index: 1;
    max-width: 800px;
    padding: 2rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-scroll {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    animation: bounce 2s ease infinite;
}

.hero-scroll:hover {
    color: var(--color-accent);
    transform: translateX(-50%) translateY(5px);
}

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

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-family: var(--font-display);
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--color-accent);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

/* ============================================
   Section Styles
   ============================================ */
section {
    padding: 6rem 0;
    position: relative;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 1.2rem;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   Categories Section
   ============================================ */
.categories {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

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

.category-card {
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: 20px;
    padding: 2.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.category-card:hover::before {
    transform: scaleX(1);
}

.category-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent);
    box-shadow: 0 10px 30px var(--color-shadow);
}

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

.category-card h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.category-card p {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.category-tags {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.category-tags li {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
    background: var(--color-overlay);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
}

/* ============================================
   Projects Section
   ============================================ */
.projects {
    background: var(--color-bg);
}

.projects-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    gap: 2rem;
}

.filter-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    font-family: var(--font-display);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 25px;
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.filter-btn:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.filter-btn.active {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 20px;
    padding: 2rem;
    transition: all 0.4s ease;
    opacity: 0;
    transform: translateY(20px);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--color-shadow);
    border-color: var(--color-accent);
}

.project-header {
    margin-bottom: 1rem;
}

.project-title-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
    gap: 1rem;
}

.project-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
}

.project-badges {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

.featured-badge,
.playable-badge {
    font-size: 0.75rem;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-weight: 600;
    white-space: nowrap;
}

.featured-badge {
    background: var(--color-accent);
    color: white;
}

.playable-badge {
    background: var(--color-overlay);
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.project-role {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.project-description {
    color: var(--color-text);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.project-highlights {
    list-style: none;
    margin-bottom: 1.5rem;
}

.project-highlights li {
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.project-highlights li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    background: var(--color-overlay);
    color: var(--color-text-secondary);
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    border: 1px solid var(--color-border);
}

.project-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.project-link {
    font-family: var(--font-display);
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    background: var(--color-accent);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.project-link:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

/* ============================================
   About Section
   ============================================ */
.about {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text {
    margin-bottom: 3rem;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: 1.5rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-accent);
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    padding: 0.6rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
}

.skill-category li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    background: var(--color-bg);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.contact-card {
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s ease;
    display: block;
}

.contact-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent);
    box-shadow: 0 10px 30px var(--color-shadow);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-card h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.contact-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 3rem 0;
    text-align: center;
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer p {
    color: var(--color-text-secondary);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ============================================
   Animations
   ============================================ */
.animate-in {
    animation: fadeInUp 0.6s ease;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    section {
        padding: 4rem 0;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .filter-buttons {
        width: 100%;
        justify-content: center;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .footer .container {
        flex-direction: column;
        text-align: center;
    }
    
    .theme-toggle {
        top: 1rem;
        right: 1rem;
    }
}

@media (max-width: 480px) {
    .btn {
        width: 100%;
        text-align: center;
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
}