:root {
    --primary: #4a90e2;
    --accent: #00c9a7;
    --bg: #f9fafa;
    --text: #2c3e50;
    --code-bg: #2e3b4e;
    --code-text: #ecf0f1;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 2rem;
    line-height: 1.7;
}

h1, h2, h3 {
    color: var(--primary);
    margin-top: 2rem;
}

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

a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

a:hover {
    text-decoration: underline;
}

.section {
    background: #fff;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
    transition: box-shadow 0.3s ease;
}

.section:hover {
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.1);
}

code, pre {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: 1rem;
    border-radius: 8px;
    display: block;
    overflow-x: auto;
    margin-top: 1rem;
    margin-bottom: 1rem;
}

ul {
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
}

h4 {
    color: var(--primary);
    margin-top: 1.5rem;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

iframe {
    width: 100%;
    height: 100vh;
    border: 1px solid #ddd;
    border-radius: 10px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    transition: box-shadow 0.3s ease;
}

iframe:hover {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

.img-center {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
}

.img-center img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transition: box-shadow 0.3s ease;
}

.img-center img:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
}

.texttt {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1em;
    background: none;
    padding: 0.1em 0.2em;
    border-radius: 4px;
    color: var(--text);
    letter-spacing: 0.5px;
}
.page-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}
@media (max-width: 768px) {
    .page-container {
        max-width: 100%;
        margin: 0;
        padding: 0;
    }

    body {
        padding: 0.5rem;
    }

    .section {
        padding: 0.5rem;
    }
}