/* CSS Variables & Reset */
:root {
    --bg-color: #0F0F0F;  /* Deep near-black */
    --text-color: #F5F5F7; /* Apple off-white */
    --text-muted: #86868b;
    --accent-color: #00D4FF; /* Neon Cyan */
    --accent-glow: rgba(0, 212, 255, 0.4);
    --card-bg: #1a1a1a;
    --border-color: #333;
    
    --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;
    
    --transition-fast: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--bg-color);
}

body {
    font-family: var(--font-stack);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-fast);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    width: 100%;
}

.section {
    padding: var(--space-xl) 0;
    position: relative;
    z-index: 2;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    display: inline-block;
    background: linear-gradient(135deg, #fff 0%, #aaa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

/* Background & Particles */
#particles-canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.6;
}

/* Header */
#main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: var(--space-sm) 0;
    transition: background var(--transition-fast), backdrop-filter var(--transition-fast);
}

#main-header.scrolled {
    background: rgba(15, 15, 15, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

#main-header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.05em;
    z-index: 101;
}

.nav-links {
    display: flex;
    gap: var(--space-md);
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--text-muted);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--text-color);
}

/* Mobile Nav */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 102;
    padding: 0.5rem;
}

.mobile-menu-btn .bar {
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    transition: var(--transition-fast);
}

.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--bg-color);
    z-index: 99;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

.mobile-nav-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.mobile-nav-overlay nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
}

.mobile-nav-overlay a {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-color);
}

/* Hero Section */
.hero-section {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    padding-top: var(--space-xl);
}

.hero-section h1 {
    font-size: clamp(4rem, 15vw, 10rem);
    font-weight: 800;
    line-height: 0.9;
    letter-spacing: -0.04em;
    margin-bottom: var(--space-sm);
    background: linear-gradient(180deg, #fff 0%, #777 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-section .tagline {
    font-size: clamp(1.2rem, 4vw, 2rem);
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: -0.02em;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-md);
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    animation: bounce 2s infinite;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: start;
}

.about-text p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.skill-tag {
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.skill-tag:hover {
    border-color: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-glow);
    transform: translateY(-2px);
    color: #fff;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-md);
}

.project-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid transparent;
    transition: var(--transition-smooth);
    position: relative;
    group: hover;
}

.project-card:hover {
    transform: translateY(-5px) scale(1.01);
    border-color: rgba(0, 212, 255, 0.3);
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
}

.project-image {
    height: 250px;
    width: 100%;
    overflow: hidden;
}

.placeholder-img {
    width: 100%;
    height: 100%;
    transition: transform var(--transition-smooth);
}

.project-card:hover .placeholder-img {
    transform: scale(1.05);
}

.project-content {
    padding: var(--space-md);
}

.project-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.project-content p {
    color: var(--text-muted);
    margin-bottom: var(--space-md);
    font-size: 1rem;
}

.project-links {
    display: flex;
    gap: var(--space-md);
}

.btn-text {
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-text .arrow {
    transition: transform 0.2s ease;
}

.btn-text:hover .arrow {
    transform: translateX(3px) translateY(-3px);
}

.btn-text:hover {
    color: var(--accent-color);
}

/* Contact Section */
.contact-container {
    max-width: 600px;
}

.contact-form {
    display: grid;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-left: 0.5rem;
}

input, textarea {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 8px;
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-fast);
    outline: none;
    -webkit-appearance: none;
}

input:focus, textarea:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-glow);
    background: rgba(255, 255, 255, 0.05);
}

.btn-primary {
    background: var(--text-color);
    color: var(--bg-color);
    border: none;
    padding: 1rem 2rem;
    border-radius: 99px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
    justify-self: start;
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

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

.social-links a {
    color: var(--text-muted);
    font-size: 1.1rem;
    transition: var(--transition-fast);
    padding: 0.5rem;
}

.social-links a:hover {
    color: var(--accent-color);
    transform: scale(1.1);
}

/* Footer */
footer {
    padding: var(--space-md) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Animations */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateX(-50%) translateY(0);}
    40% {transform: translateX(-50%) translateY(-10px);}
    60% {transform: translateX(-50%) translateY(-5px);}
}

.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }

/* Media Queries */
@media (max-width: 768px) {
    :root {
        --space-lg: 3rem;
        --space-xl: 6rem;
    }
    
    .nav-links { display: none; }
    .mobile-menu-btn { display: flex; }
    
    .hero-section h1 {
        font-size: 15vw; /* Massive on mobile too */
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
}