/* ===== CSS Variables ===== */
:root {
    --color-bg: #0a0c10;
    --color-bg-secondary: #0f1318;
    --color-bg-tertiary: #161b22;
    --color-surface: #1c2128;
    --color-border: #2d333b;
    --color-border-light: #444c56;
    
    --color-text: #f0f3f6;
    --color-text-secondary: #9aa5b1;
    --color-text-muted: #6b7785;
    
    --color-primary: #4a6fa5;
    --color-primary-light: #6989b9;
    --color-primary-dark: #3d5a80;
    
    --color-accent: #7ea3cc;
    --color-accent-secondary: #98b4d4;
    
    --color-success: #3fb950;
    --color-warning: #d29922;
    
    --gradient-primary: linear-gradient(135deg, #3d5a80 0%, #4a6fa5 50%, #6989b9 100%);
    --gradient-accent: linear-gradient(135deg, #4a6fa5 0%, #7ea3cc 100%);
    --gradient-glow: radial-gradient(ellipse at center, rgba(74, 111, 165, 0.15) 0%, transparent 70%);
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(74, 111, 165, 0.3);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
    height: auto;
}

ul, ol {
    list-style: none;
}

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

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    border-bottom-color: var(--color-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

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

.btn-support {
    padding: 8px 16px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    color: var(--color-text) !important;
}

.btn-support:hover {
    opacity: 0.9;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

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

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 24px 80px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-primary-light);
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-text);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(74, 111, 165, 0.4);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-border-light);
}

.hero-stats {
    display: flex;
    gap: 48px;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.hero-visual {
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    pointer-events: none;
}

.hero-glow {
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    width: 800px;
    height: 800px;
    background: var(--gradient-glow);
    filter: blur(80px);
    opacity: 0.6;
}

/* ===== Section Styles ===== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-primary-light);
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Projects Section ===== */
.projects {
    padding: 100px 0;
    background: var(--color-bg);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.project-card.featured {
    grid-column: span 2;
    display: grid;
    grid-template-columns: 1fr 1.5fr;
}

.project-image {
    background: var(--color-bg-tertiary);
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    overflow: hidden;
}

.project-render {
    width: 100%;
    height: 100%;
    object-fit: contain;
    max-height: 250px;
    border-radius: var(--radius-md);
}

.project-card.featured .project-render {
    max-height: 350px;
}

.project-icon {
    width: 80px;
    height: 80px;
    color: var(--color-primary-light);
    opacity: 0.8;
}

.project-card.featured .project-icon {
    width: 120px;
    height: 120px;
}

.project-content {
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.project-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    padding: 4px 10px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.tag-featured {
    background: var(--gradient-primary);
    color: var(--color-text);
}

.tag-cnc {
    background: rgba(74, 111, 165, 0.2);
    color: var(--color-accent);
}

.project-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.project-subtitle {
    font-size: 0.9rem;
    color: var(--color-primary-light);
    font-weight: 500;
}

.project-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.project-features {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 8px 0;
}

.project-features li {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    padding-left: 20px;
    position: relative;
}

.project-features li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary-light);
}

.project-stats {
    display: flex;
    gap: 16px;
    margin-top: auto;
    padding-top: 12px;
}

.project-stat {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.project-stat svg {
    color: var(--color-warning);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
    font-weight: 600;
    color: var(--color-primary-light);
    transition: var(--transition-fast);
}

.project-link:hover {
    color: var(--color-text);
    gap: 12px;
}

/* ===== About Section ===== */
.about {
    padding: 100px 0;
    background: var(--color-bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    margin-top: 16px;
}

.about-content p {
    color: var(--color-text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-links {
    display: flex;
    gap: 16px;
    margin-top: 32px;
    flex-wrap: wrap;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.highlight-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    transition: var(--transition-normal);
}

.highlight-card:hover {
    border-color: var(--color-border-light);
}

.highlight-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    color: var(--color-primary-light);
}

.highlight-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.highlight-card p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===== Footer ===== */
.footer {
    padding: 60px 0 30px;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.footer-logo .logo-img {
    width: 48px;
    height: 48px;
}

.footer-brand .logo-text {
    font-size: 1.5rem;
    display: block;
    margin-bottom: 12px;
}

.footer-brand p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-links {
    display: flex;
    gap: 80px;
}

.footer-column h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text);
}

.footer-column a {
    display: block;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    padding: 6px 0;
    transition: var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-text);
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.designed-with {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.onshape-link {
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0.7;
    transition: var(--transition-fast);
}

.onshape-link:hover {
    opacity: 1;
}

.onshape-logo {
    height: 24px;
    width: auto;
    filter: grayscale(100%) brightness(0.8);
    transition: var(--transition-fast);
}

.onshape-link:hover .onshape-logo {
    filter: grayscale(0%) brightness(1);
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .project-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card.featured {
        grid-column: span 1;
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 100px 24px 60px;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-stats {
        gap: 32px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        justify-content: center;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .about-content h2 {
        font-size: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 40px;
    }
    
    .footer-links {
        gap: 40px;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .project-content {
        padding: 20px;
    }
    
    .highlight-card {
        flex-direction: column;
        text-align: center;
    }
    
    .highlight-icon {
        margin: 0 auto;
    }
}