body {
    font-family: 'Arial', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #06393b;
    margin: 0;
    padding: 0;
}

header {
    background-color: #007bff;
    color: white;
    padding: 1rem 1.25rem;
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.brand h1 {
    margin: 0;
    font-size: 2.2rem;
}

.brand p {
    margin: 0.4rem 0 0;
    font-size: 1rem;
    opacity: 0.9;
}

.site-nav {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.site-nav a {
    color: white;
    text-decoration: none;
    padding: 0.65rem 1rem;
    border-radius: 999px;
    background: rgba(255,255,255,0.15);
    transition: background-color 0.25s ease, transform 0.25s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
    background: rgba(255,255,255,0.3);
    transform: translateY(-1px);
}

h1 {
    margin: 0;
    font-size: 2.5rem;
}

h2 {
    font-size: 1.8rem;
    margin-top: 0;
}

main {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.page-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 1.5rem;
    align-items: start;
}

.sidebar {
    background-color: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 12px;
    padding: 1.5rem;
    color: #f6f6f6;
}

.sidebar h2,
.sidebar h3 {
    margin-top: 0;
    color: #ffffff;
}

.sidebar p,
.sidebar li {
    margin: 0.75rem 0;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar ul li {
    margin-bottom: 0.75rem;
}

.sidebar a {
    color: #d8f2f0;
    text-decoration: none;
}

.sidebar a:hover,
.sidebar a:focus-visible {
    text-decoration: underline;
}

.content section {
    background-color: rgb(124, 207, 202);
    margin-bottom: 2rem;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

ul {
    list-style-type: disc;
    padding-left: 1.5rem;
}

footer {
    text-align: center;
    padding: 1rem;
    background-color: #333;
    color: white;
}

@media (max-width: 860px) {
    .page-layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        order: 2;
    }

    .content {
        order: 1;
    }

    .site-nav {
        justify-content: center;
    }
}

@media (max-width: 520px) {
    .header-inner {
        text-align: center;
    }

    .site-nav a {
        padding: 0.6rem 0.8rem;
    }
}