/* Global Styles */
:root {
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --primary-color: #8b5cf6;
    --secondary-color: #06b6d4;
    --accent-color: #f472b6;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-main: 'Inter', sans-serif;
    --font-code: 'Fira Code', monospace;
}

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

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

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: #fff;
}

h1 {
    font-size: 3.5rem;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: 2.5rem;
}

p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: #94a3b8;
}

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

.section {
    padding: 5rem 0;
}

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    color: #fff;
}

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

.nav-links a {
    font-weight: 500;
    color: #cbd5e1;
}

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

.cta-button {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -10px rgba(139, 92, 246, 0.5);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(139, 92, 246, 0.15) 0%, transparent 50%);
    animation: rotate 20s linear infinite;
    z-index: -1;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hero-content {
    max-width: 800px;
    z-index: 1;
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
    display: block;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.secondary-button {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: 1px solid var(--glass-border);
    color: #fff;
    border-radius: 50px;
    font-weight: 600;
    transition: background 0.3s ease;
}

.secondary-button:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 1rem;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

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

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

/* Tutorials Page */
.tutorials-layout {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 3rem;
    padding-top: 100px; /* Account for fixed header */
    min-height: 100vh;
}

.sidebar {
    position: sticky;
    top: 100px;
    height: calc(100vh - 100px);
    overflow-y: auto;
    padding-right: 1rem;
    border-right: 1px solid var(--glass-border);
}

.sidebar h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: #fff;
}

.sidebar ul li {
    margin-bottom: 0.5rem;
}

.sidebar a {
    display: block;
    padding: 0.5rem;
    border-radius: 0.5rem;
    color: #94a3b8;
    font-size: 0.95rem;
}

.sidebar a:hover, .sidebar a.active {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}

.tutorial-content {
    padding-bottom: 5rem;
}

.tutorial-section {
    margin-bottom: 4rem;
    scroll-margin-top: 100px;
}

.code-block {
    background: #1e293b;
    padding: 1.5rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    font-family: var(--font-code);
    font-size: 0.9rem;
    color: #e2e8f0;
    border: 1px solid var(--glass-border);
    margin: 1.5rem 0;
}

/* Footer */
footer {
    background: #020617;
    padding: 3rem 0;
    margin-top: auto;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: #64748b;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .tutorials-layout { grid-template-columns: 1fr; }
    .sidebar { display: none; } /* Simplified for mobile for now */
    .nav-links { display: none; } /* Needs mobile menu implementation */
}