/* Custom Properties & Design System */
:root {
    --bg-main: #0B0F19;
    --bg-secondary: #121826;
    --bg-card: #1A2235;
    
    --text-primary: #F3F4F6;
    --text-secondary: #9CA3AF;
    --text-muted: #6B7280;
    
    --accent-blue: #3B82F6;
    --accent-purple: #8B5CF6;
    --accent-gradient: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    
    --border-color: rgba(255, 255, 255, 0.08);
    
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 24px;
    
    --transition-normal: 0.3s ease;
    --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

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

.mt-4 {
    margin-top: 1.5rem;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition-normal);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.icon-sm {
    width: 18px;
    height: 18px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

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

.mobile-toggle {
    display: none;
    cursor: pointer;
    color: var(--text-primary);
}

/* Sections Base */
.section {
    padding: 100px 0;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: var(--accent-blue);
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 24px;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-ctas {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
}

.glow-1 {
    top: -10%;
    right: -5%;
    width: 500px;
    height: 500px;
    background: var(--accent-blue);
}

.glow-2 {
    bottom: -10%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: var(--accent-purple);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

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

.about-stats {
    display: grid;
    gap: 20px;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
}

.stat-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateX(10px);
}

.stat-card h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

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

/* Stack Section */
.stack-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 24px;
    margin-top: 48px;
}

.stack-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    transition: var(--transition-normal);
}

.stack-item:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.05);
}

.stack-icon {
    width: 40px;
    height: 40px;
    color: var(--accent-purple);
}

.stack-item span {
    font-weight: 600;
    font-size: 1rem;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    margin-top: 48px;
}

.project-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-card);
    border-color: rgba(255, 255, 255, 0.2);
}

.project-image {
    width: 100%;
    height: 240px;
    position: relative;
    background-color: #232D42;
    background-size: cover;
    background-position: center;
}

/* Mock backgrounds for project images */
.pdv-bg {
    background: linear-gradient(135deg, #1E3A8A, #3B82F6);
}

.catalog-bg {
    background: linear-gradient(135deg, #4C1D95, #8B5CF6);
}

.os-bg {
    background: linear-gradient(135deg, #064E3B, #10B981);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-link {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: var(--transition-normal);
}

.project-link:hover {
    background: var(--accent-blue);
    transform: scale(1.1);
}

.project-content {
    padding: 32px;
}

.project-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    color: var(--text-secondary);
}

.project-title {
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Footer Section */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 80px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 64px;
    margin-bottom: 64px;
}

.footer-title {
    font-size: 2rem;
    margin-bottom: 16px;
}

.footer-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 500px;
}

.footer-social h3 {
    font-size: 1.25rem;
    margin-bottom: 24px;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.social-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
    transition: var(--transition-normal);
    font-weight: 500;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

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

/* Responsive Design */
@media (max-width: 992px) {
    .about-grid, .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-ctas {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
}