body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #eef2ff, #f8fafc);
    color: #1f2937;
    line-height: 1.6;
}

.container {
    background: white;
    padding: 40px 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.container h1 {
    margin: 0 0 10px;
    font-size: 2rem;
}

.container p {
    margin: 0;
    color: #6b7280;
}

.main-row {
    display: flex;
    gap: 20px;
    padding: 20px;
    flex-wrap: wrap;
}

.content {
    background: white;
    margin: 20px;
    padding: 20px;
    border-radius: 14px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.sidebar,
.extra {
    flex: 1;
    min-width: 260px;
    background: white;
    padding: 20px;
    border-radius: 14px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border: 1px solid #e5e7eb;
}

.sidebar {
    background: #eff6ff;
}

.extra {
    background: #fef3c7;
}

.sidebar h2,
.extra h2,
.content h2 {
    margin-top: 0;
    margin-bottom: 12px;
    color: #111827;
}

.sidebar ul,
.extra ul {
    padding-left: 20px;
    margin: 0;
}

.sidebar li,
.extra li {
    margin-bottom: 8px;
}

.sidebar a {
    color: #2563eb;
    text-decoration: none;
}

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

.footer {
    background: #111827;
    color: white;
    text-align: center;
    padding: 16px;
    margin-top: 20px;
}