/* Global Variables */
:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --secondary-color: #8b5cf6;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --border-color: #334155;
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --transition: all 0.3s ease;
}

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

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

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

ul {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h1 { font-size: 3.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2.25rem; margin-top: 3rem; color: var(--text-primary); -webkit-text-fill-color: initial; }
h3 { font-size: 1.5rem; color: var(--text-primary); -webkit-text-fill-color: initial; }
p { margin-bottom: 1.5rem; color: var(--text-secondary); font-size: 1.1rem; }

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

.section {
    padding: 5rem 0;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.6rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5);
}

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

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Landing Page */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: radial-gradient(circle at top right, rgba(59, 130, 246, 0.1), transparent 40%),
                radial-gradient(circle at bottom left, rgba(139, 92, 246, 0.1), transparent 40%);
}

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

.hero-badges {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.badge {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

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

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 40px -10px rgba(0,0,0,0.5);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

/* Code Blocks */
pre {
    background: #0f1117;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid var(--border-color);
    margin: 1.5rem 0;
}

code {
    font-family: 'Fira Code', 'Courier New', monospace;
    color: var(--accent);
}

p code {
    background: rgba(255,255,255,0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
}

/* Steps */
.step {
    border-left: 2px solid var(--border-color);
    padding-left: 2rem;
    margin-left: 1rem;
    padding-bottom: 3rem;
    position: relative;
}

.step:last-child {
    border-left: 2px solid transparent;
}

.step-number {
    position: absolute;
    left: -1rem;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--card-bg);
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: 4rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
}

/* Author Page */
.profile-header {
    text-align: center;
    padding: 4rem 0;
}

.avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 4px solid var(--primary-color);
    margin-bottom: 1.5rem;
    object-fit: cover;
    background-color: var(--card-bg);
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .nav-links { display: none; } /* Simplified for now */
}