:root {
    --primary: #6a0dad;
    --primary-dark: #4b0082;
    --text: #e0e0e0;
    --bg: #121212;
    --card-bg: #1e1e1e;
    --border: #333;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 1rem 0;
    margin-bottom: 2rem;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
}

.main-nav a {
    color: white;
    text-decoration: none;
    margin-left: 1.5rem;
    padding: 0.5rem 0;
    position: relative;
}

.main-nav a:hover,
.main-nav a.active {
    opacity: 0.9;
}

.main-nav a.active {
    font-weight: 600;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: white;
    transition: width 0.3s ease;
}

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

/* Card */
.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Code blocks */
code, .code-block {
    font-family: 'Fira Code', monospace;
    background: #2d2d2d;
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
}

.code-block {
    display: block;
    padding: 1rem;
    margin: 1rem 0;
    overflow-x: auto;
}

/* Buttons */
.btn {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s, transform 0.2s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .main-nav {
        margin-top: 1rem;
    }
    
    .main-nav a {
        margin: 0 0.75rem;
    }
}

/* Content */
h1, h2, h3, h4 {
    color: white;
    margin: 1.5rem 0 1rem;
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2rem;
    color: var(--primary);
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

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

a:hover {
    text-decoration: underline;
}

/* Step by step */
.step {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.step:last-child {
    border-bottom: none;
}

/* Note boxes */
.note {
    background: rgba(106, 13, 173, 0.1);
    border-left: 4px solid var(--primary);
    padding: 1rem;
    margin: 1.5rem 0;
    border-radius: 0 4px 4px 0;
}