:root {
    --primary-color: #1E2A38;
    --secondary-color: #2C3E50;
    --accent-color: #34C759;
    --neutral-color: #F9F9F9;
    --text-color: #333;
    --line-color: #34C759;
}

body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    line-height: 1.8;
    letter-spacing: 0.5px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background: rgba(0, 0, 0, 0.2);
    color: var(--neutral-color);
}

header h1 {
    font-size: 2rem;
    font-weight: bold;
}

nav a {
    color: var(--accent-color);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover {
    color: #fff;
}

.container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.module {
    width: calc(50% - 20px);
    margin-bottom: 20px;
    background: var(--neutral-color);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.module:hover {
    transform: translateY(-5px);
}

@media (max-width: 768px) {
    .module {
        width: 100%;
    }
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.card {
    background: var(--neutral-color);
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-bottom: 20px;
}

.card-header {
    background: var(--accent-color);
    color: var(--neutral-color);
    padding: 15px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: bold;
}

.card-body {
    padding: 20px;
    font-size: 1rem;
    line-height: 1.6;
}

pre {
    background: #2C3E50;
    color: #fff;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.9rem;
}

code {
    font-family: 'Courier New', monospace;
    color: #FFD700;
}

button {
    background: var(--accent-color);
    color: var(--neutral-color);
    border: none;
    padding: 10px 20px;
    font-size: 1rem;
    cursor: pointer;
    border-radius: 5px;
    transition: background 0.3s ease;
}

button:hover {
    background: #2E7D32;
}

h2, h3, h4 {
    color: var(--accent-color);
    margin-top: 20px;
    margin-bottom: 10px;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
}

li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background: var(--accent-color);
    border-radius: 50%;
}

footer {
    text-align: center;
    padding: 20px;
    color: var(--neutral-color);
    font-size: 0.9rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.section {
    opacity: 0;
    animation: fadeIn 1s ease forwards;
    animation-delay: 0.5s;
}