/* Base & Variables */
:root {
    --bg-main: #0a0f1c; /* Dark blue/black */
    --bg-secondary: #111827; /* Darker grey/blue */
    --bg-card: rgba(255, 255, 255, 0.03); /* Glassmorphic card */
    --bg-glass: rgba(10, 15, 28, 0.7); /* Navbar glass */
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent-primary: #3b82f6; /* Blue */
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --accent-gradient-hover: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --accent-purple: #8b5cf6;
    --border-color: rgba(255, 255, 255, 0.1);
    
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* Offset for sticky navbar */
}

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

ul {
    list-style: none;
}

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

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

.text-center { text-align: center; }
.mb-5 { margin-bottom: 3rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }
.max-w-md { max-width: 768px; }
.mx-auto { margin-left: auto; margin-right: auto; }
.items-center { align-items: center; }

.bg-light { background-color: var(--bg-secondary); }

.grid {
    display: grid;
    gap: 2rem;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* Sections */
.section {
    padding: 6rem 0;
    position: relative;
}

.section-badge {
    display: inline-block;
    padding: 0.25rem 1rem;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-primary);
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 3rem;
}

@media (max-width: 768px) {
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
    font-family: var(--font-sans);
}

.btn-sm { padding: 0.5rem 1rem; font-size: 0.875rem; }
.btn-lg { padding: 1rem 2rem; font-size: 1.125rem; }

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

.btn-primary:hover {
    background: var(--accent-gradient-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(59, 130, 246, 0.05);
}

.action-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Navbar */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 0;
    transition: var(--transition-normal);
}

#navbar.scrolled {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.nav-brand span {
    color: var(--accent-primary);
}

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

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9375rem;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-primary);
}

.menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-links {
        display: none; /* Mobile menu hidden by default */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-main);
        flex-direction: column;
        padding: 1.5rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border-color);
    }
    .nav-links.active {
        display: flex;
    }
    .menu-btn {
        display: block;
    }
}

/* Hero Section */
#hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    padding-top: 80px;
}

.glow-sphere {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    opacity: 0.4;
}

.glow-1 {
    width: 400px;
    height: 400px;
    background: var(--accent-primary);
    top: 20%;
    left: 10%;
    animation: float 10s ease-in-out infinite;
}

.glow-2 {
    width: 300px;
    height: 300px;
    background: var(--accent-purple);
    bottom: 20%;
    right: 15%;
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    50% { transform: translate(30px, -50px); }
    100% { transform: translate(0, 0); }
}

.hero-content {
    max-width: 800px;
    padding: 2rem;
    z-index: 10;
    animation: fadeInUp 1s ease forwards;
}

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

.hero-title {
    font-family: var(--font-heading);
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero-tagline {
    font-size: 2rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.social-links {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: var(--transition-fast);
}

.social-links a:hover {
    color: var(--accent-primary);
    transform: translateY(-3px);
}

.scroll-down {
    position: absolute;
    bottom: 2rem;
    color: var(--text-secondary);
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-15px); }
    60% { transform: translateY(-7px); }
}

@media (max-width: 768px) {
    .hero-title { font-size: 3rem; }
    .hero-tagline { font-size: 1.5rem; }
}

/* Cards (Projects, Blogs) */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    transition: var(--transition-normal);
    position: relative;
}

.card:hover {
    transform: translateY(-10px);
    border-color: rgba(59, 130, 246, 0.4);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.project-card .card-img {
    height: 200px;
    overflow: hidden;
}

.img-placeholder {
    width: 100%;
    height: 100%;
    transition: transform 0.5s ease;
}

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

.card-body {
    padding: 1.5rem;
}

.card-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.card-text {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 999px;
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

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

.card-link.primary {
    color: var(--accent-primary);
}

.card-link.primary:hover {
    text-decoration: underline;
}

/* Demos */
.demo-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 800px;
    margin: 0 auto;
}

.demo-item {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    border-radius: 1rem;
    transition: var(--transition-normal);
}

.demo-item:hover {
    border-color: rgba(59, 130, 246, 0.3);
    background: rgba(255, 255, 255, 0.05);
}

.demo-info {
    flex: 1;
}

.demo-info h3 {
    font-size: 1.25rem;
    font-family: var(--font-heading);
    margin-bottom: 0.25rem;
}

.demo-info p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.demo-action {
    margin: 0 1.5rem;
}

.demo-preview {
    width: 100px;
    height: 60px;
    border-radius: 0.5rem;
    overflow: hidden;
    opacity: 0.8;
    transition: var(--transition-normal);
}

.demo-item:hover .demo-preview {
    opacity: 1;
    transform: scale(1.05);
}

.text-primary { color: #3b82f6; }
.text-secondary { color: #10b981; }
.text-accent { color: #8b5cf6; }

@media (max-width: 600px) {
    .demo-item {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    .demo-action { margin: 0; }
    .demo-preview { display: none; }
}

/* Blog Cards */
.blog-card {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 1rem;
}

.blog-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
}

.blog-meta {
    font-size: 0.875rem;
    color: #6b7280;
    margin-bottom: 0.5rem;
}

.blog-title {
    font-size: 1.25rem;
    font-family: var(--font-heading);
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.blog-card:hover .blog-title {
    color: var(--accent-primary);
}

.blog-excerpt {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
}

.blog-read-more {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.blog-card:hover .blog-read-more i {
    transform: translateX(4px);
}
.blog-read-more i { transition: transform var(--transition-fast); }


/* API & Window Mockup */
.window-mockup {
    background: #1e1e1e;
    border-radius: 0.5rem;
    border: 1px solid #333;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

.window-header {
    background: #2d2d2d;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.window-title {
    margin-left: auto;
    margin-right: auto;
    font-size: 0.75rem;
    color: #888;
    font-family: monospace;
}

.window-body {
    padding: 1.5rem;
    font-family: monospace;
}

.swagger-path {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
    padding: 0.5rem;
    background: rgba(255,255,255,0.05);
    border-radius: 4px;
}

.swagger-path .method {
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    font-weight: bold;
    font-size: 0.75rem;
}

.swagger-path.get .method { background: #61affe; color: #fff; }
.swagger-path.post .method { background: #49cc90; color: #fff; }
.swagger-path.put .method { background: #fca130; color: #fff; }

.swagger-path .url {
    color: #fff;
    font-weight: bold;
}

.swagger-path .desc {
    color: #999;
    font-size: 0.85rem;
    margin-left: auto;
}

.api-endpoint {
    display: inline-flex;
    align-items: center;
    background: rgba(0,0,0,0.5);
    border: 1px solid #333;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-family: monospace;
    font-size: 1.1rem;
}

.api-endpoint .method {
    color: #61affe;
    font-weight: bold;
    margin-right: 1rem;
}

.api-endpoint .route {
    color: #e5e5e5;
}

/* Lab Section */
.lab-container {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.lab-card {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 1rem;
    width: 250px;
    transition: var(--transition-normal);
}

.lab-card:hover {
    border-color: var(--accent-purple);
    transform: translateY(-5px);
}

.lab-icon {
    font-size: 2.5rem;
    color: var(--accent-purple);
    margin-bottom: 1rem;
}

.lab-card h3 {
    font-family: var(--font-heading);
    margin-bottom: 0.5rem;
}

.lab-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
    background: var(--bg-secondary);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    color: #6b7280;
    font-size: 0.875rem;
}

.btn-top {
    background: rgba(255,255,255,0.1);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-top:hover {
    background: var(--accent-primary);
    transform: translateY(-3px);
}

@media (max-width: 600px) {
    .swagger-path {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    .swagger-path .desc { margin-left: 0; }
}