body {
    font-family: 'Montserrat', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(to bottom, #0a1128, #000000);
    color: #f0f0f0;
    overflow-x: hidden;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 0;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

header h1 {
    font-family: 'Roboto', sans-serif;
    font-size: 2.5em;
    color: #00bcd4;
    margin: 0;
    text-shadow: 0 0 10px rgba(0, 188, 212, 0.8);
}

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

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    text-decoration: none;
    color: #ffffff;
    padding: 10px 15px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

nav ul li a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.hero {
    position: relative;
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(45deg, rgba(3, 169, 244, 0.1), rgba(63, 81, 181, 0.1));
    border-radius: 10px;
    margin-bottom: 30px;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    opacity: 0.05;
    z-index: -1;
}


.hero h2 {
    font-size: 3em;
    color: #ffffff;
    margin-bottom: 20px;
    text-shadow: 2px 2px 5px #000;
}

.hero p {
    font-size: 1.2em;
    color: #eee;
    line-height: 1.6;
    max-width: 700px;
    margin: 0 auto;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 30px 0;
}

.feature-card {
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.feature-card img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin-bottom: 20px;
    object-fit: cover;
    box-shadow: 0 0 10px rgba(0, 188, 212, 0.5);
}

.feature-card h3 {
    color: #00bcd4;
    font-size: 1.8em;
    margin-bottom: 15px;
    text-shadow: 1px 1px 3px #000;
}

.feature-card p {
    color: #ddd;
    line-height: 1.7;
}

.article-section {
    padding: 50px 0;
    background-color: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.1);
}

.article-section h2 {
    font-size: 2.5em;
    color: #ffffff;
    margin-bottom: 30px;
    text-align: center;
    text-shadow: 2px 2px 5px #000;
}

article {
    padding: 0 20px;
}

article h3 {
    font-size: 2em;
    color: #00bcd4;
    margin-top: 30px;
    margin-bottom: 20px;
    text-shadow: 1px 1px 3px #000;
}

article h4 {
    font-size: 1.6em;
    color: #00bcd4;
    margin-top: 25px;
    margin-bottom: 15px;
    text-shadow: 1px 1px 3px #000;
}

article p {
    font-size: 1.1em;
    line-height: 1.8;
    color: #eee;
    margin-bottom: 20px;
}

article b {
    color: #00e5ff;
    font-weight: bold;
}

article ul, article ol {
    color: #eee;
    line-height: 1.8;
    padding-left: 30px;
    margin-bottom: 20px;
}

article li {
    margin-bottom: 10px;
}


article pre {
    background-color: #1d2b3a;
    color: #f8f8f2;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.9em;
    line-height: 1.6;
    tab-size: 4;
    white-space: pre-wrap;
    word-wrap: break-word;
}

article code {
    font-family: monospace, monospace;
}


article table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    margin-bottom: 20px;
    color: #eee;
}

article th, article td {
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 10px;
    text-align: left;
}

article th {
    background-color: rgba(255, 255, 255, 0.08);
    font-weight: bold;
}


footer {
    text-align: center;
    padding: 30px 0;
    color: #999;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}


.data-display {
    padding: 30px 0;
    text-align: center;
    color: #ddd;
}

.data-display h2 {
    font-size: 2em;
    color: #00bcd4;
    margin-bottom: 25px;
    text-shadow: 1px 1px 3px #000;
}

.data-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.data-list li {
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 20px 30px;
    margin-bottom: 15px;
    width: 80%;
    max-width: 600px;
    text-align: left;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.1);
}

.data-list li strong {
    color: #00e5ff;
}

.reference-tip {
    text-align: center;
    color: #ffc107;
    margin-top: 20px;
    font-size: 1.1em;
    text-shadow: 1px 1px 2px #000;
}


@media (max-width: 768px) {
    header {
        flex-direction: column;
        text-align: center;
    }
    header h1 {
        margin-bottom: 15px;
    }
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    nav ul li {
        margin-left: 0;
        margin-top: 10px;
    }
    .hero {
        padding: 80px 20px;
    }
    .hero h2 {
        font-size: 2.5em;
    }
    .hero p {
        font-size: 1.1em;
    }
    .features {
        grid-template-columns: 1fr;
    }
    .feature-card {
        padding: 20px;
    }
    .feature-card h3 {
        font-size: 1.6em;
    }
    .article-section {
        padding: 30px 20px;
    }
    .article-section h2 {
        font-size: 2em;
    }
    article {
        padding: 0;
    }
    .data-list li {
        width: 95%;
    }
}

@media (max-width: 480px) {
    .hero h2 {
        font-size: 2em;
    }
    .hero p {
        font-size: 1em;
    }
    .feature-card h3 {
        font-size: 1.4em;
    }
    .article-section h2 {
        font-size: 1.8em;
    }
    .data-list li {
        padding: 15px 20px;
    }
    article p, article ul, article ol, article table, article pre {
        font-size: 1em;
    }
    article h3 {
        font-size: 1.8em;
    }
    article h4 {
        font-size: 1.4em;
    }
}

@media (max-width: 320px) {
    .hero h2 {
        font-size: 1.8em;
    }
     .hero p {
        font-size: 0.95em;
    }
    .feature-card h3 {
        font-size: 1.3em;
    }
    .article-section h2 {
        font-size: 1.6em;
    }
     article p, article ul, article ol, article table, article pre {
        font-size: 0.95em;
    }
    article h3 {
        font-size: 1.6em;
    }
    article h4 {
        font-size: 1.3em;
    }
    .data-list li {
        padding: 10px 15px;
        font-size: 0.95em;
    }
}