*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #292929;
    color: #eee;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
main {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem 2rem 2rem;
    flex: 1;
}
header {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 1rem 2rem;
    border-bottom: #2e2e2e 2px solid;
    position: sticky;
    top: 0;
    background-color: #1e1e1e;
    z-index: 100;
    text-align: center;
}
footer {
    color: #aaa;
    font-size: 0.9rem;
    text-align: center;
    background-color: #1e1e1e;
    padding: 1rem 0;
}
h1 {
    color: #ffffff;
    margin: 0;
}
nav {
    margin-left: 1.5rem;
}
nav a {
    color: #0099ff;
    text-decoration: none;
    margin: 0 0.5rem;
    transition: color 0.2s;
}
nav a:hover {
    color: #00ccff;
}
a {
    color: #0099ff;
    text-decoration: none;
    border: 1px;
}
.btn {
    display: inline-block;
    background-color: #a200ff;
    color: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    margin-top: 0.5rem;
    transition: background-color 0.2s;
}
section {
    background-color: #1e1e1e;
    border-radius: 16px;
    padding: 1rem 2rem;
    margin: 2rem 0;
    transition: transform 0.2s, border-color 0.2s;
}
section:hover {
    transform: translateY(-4px);
    border-color: #a200ff;
}

h2 {
    color: #ffffff;
    border-bottom: 1px solid #555;
    padding-bottom: 0.5rem;
}
h3 {
    color: #a200ff;
}
div.hero {
    text-align: center;
    padding: 2rem 0 1rem 0;
    border-bottom: 2px solid #2e2e2e;
    margin-bottom: 2rem;
}
.hero h2 {
    font-size: 1.8rem;
    color: #ffffff;
}

img {
    border-radius: 16px;
    max-width: 100%;
    height: auto;
}
iframe {
    padding: 1rem 0;
}