:root {
    --primary-color: #0D1B2A;
    --secondary-color: #162447;
    --accent-color: #37C69F;
    --hover-accent: #2E865E;
    --text-color: #FFFFFF;
    --subtle-text: #BFCDD9;
    --gradient-start: #0D1B2A;
    --gradient-end: #162447;
    --shadow-color: rgba(55, 198, 159, 0.3);
}

body {
    margin: 0;
    font-family: 'Open Sans', sans-serif;
    color: var(--text-color);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    line-height: 1.6;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(13, 27, 42, 0.8);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-family: 'Roboto Bold', sans-serif;
    font-size: 24px;
    color: var(--accent-color);
    margin: 0;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 20px;
}

nav ul li a {
    color: var(--subtle-text);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: var(--accent-color);
}

.hero {
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover, linear-gradient(135deg, #0D1B2A, #162447);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--text-color);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(55, 198, 159, 0.1) 10%, transparent 10.01%);
    animation: moveParticles 10s linear infinite;
}

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

.hero h2 {
    font-family: 'Roboto Bold', sans-serif;
    font-size: 48px;
    margin: 0;
}

.hero p {
    font-size: 20px;
    margin: 20px 0;
}

.cta-button {
    background: var(--accent-color);
    color: var(--text-color);
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.cta-button:hover {
    background: var(--hover-accent);
}

.section {
    padding: 80px 20px;
    text-align: center;
}

.section:nth-child(even) {
    background: var(--secondary-color);
}

.section h3 {
    font-family: 'Roboto Bold', sans-serif;
    font-size: 36px;
    margin-bottom: 20px;
}

.article-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.article-container h2 {
    font-size: 32px;
    margin-bottom: 20px;
}

.article-container p {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.article-container pre {
    background: #1E293B;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

.article-container code {
    color: var(--accent-color);
    font-size: 16px;
}

.table-container {
    overflow-x: auto;
    margin: 20px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 0 auto;
}

table th, table td {
    padding: 10px;
    border: 1px solid var(--subtle-text);
    text-align: left;
}

table th {
    background: var(--accent-color);
    color: var(--text-color);
}

footer {
    padding: 40px 20px;
    text-align: center;
    background: var(--primary-color);
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 10px;
    }

    .hero h2 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
    }

    .section h3 {
        font-size: 28px;
    }

    .article-container h2 {
        font-size: 28px;
    }

    .article-container p {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    nav ul {
        flex-direction: column;
        gap: 10px;
    }

    .cta-button {
        font-size: 16px;
        padding: 10px 20px;
    }
}