:root {
    --bg-color: #f6f6ef;
    --text-color: #000000;
    --header-bg: #ff6600;
    --header-text: #000000;
    --card-bg: #f6f6ef;
    --link-color: #ff6600;
    --link-hover: #ff8533;
    --card-shadow: rgba(0,0,0,0.1);
    --banner-bg: #f6f6ef;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --text-color: #e0e0e0;
        --header-bg: #ff6600;
        --header-text: #000000;
        --card-bg: #2c2c2c;
        --link-color: #ff6600;
        --link-hover: #ff8533;
        --card-shadow: rgba(255,255,255,0.1);
        --banner-bg: #2a2a2a;
    }
}

body {
    font-family: Verdana, Geneva, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
}

.container {
    display: flex;
    max-width: 1200px;
    width: 100%;
}

.banner {
    display: block;
    background-color: var(--banner-bg);
    padding: 20px;
    box-sizing: border-box;
    margin-bottom: 20px;
}

.banner img {
    width: 100%;
    height: auto;
    margin-bottom: 10px;
}

.banner h2 {
    font-size: 1.2em;
    margin-top: 0;
}

.banner p {
    font-size: 0.9em;
}

.content {
    flex-grow: 1;
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
    order: 1;
}

.sidebar {
    width: 200px;
    order: 2;
    position: sticky;
    top: 20px;
    align-self: flex-start;
    height: fit-content;
}

header {
    background-color: var(--header-bg);
    color: var(--header-text);
    text-align: center;
    padding: 20px;
    border-radius: 5px;
    margin-bottom: 30px;
}

h1 {
    margin: 0;
    font-size: 1.8em;
}

h2 {
    color: var(--text-color);
    border-bottom: 2px solid var(--header-bg);
    padding-bottom: 10px;
    margin-top: 40px;
}

.article-content {
    max-width: 100%;
}

.article-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
    border-radius: 8px;
}

.article-content p {
    margin-bottom: 20px;
    font-size: 1em;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

.back-link {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 10px 20px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: inline-block;
}

.back-link:hover {
    background-color: var(--link-hover);
    text-decoration: none;
}

.intro {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 5px;
    margin-bottom: 30px;
    border-left: 4px solid var(--header-bg);
}

.cost-highlight {
    font-weight: bold;
    color: var(--header-bg);
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
        padding: 0 10px;
    }
    .banner {
        width: 100%;
        position: static;
        margin-top: 20px;
    }
    .sidebar {
        width: 100%;
        padding-left: 0;
        order: 3;
        position: static;
    }
    .content {
        padding: 10px;
        max-width: 100%;
    }
}

.pattern-link {
    text-decoration: underline;
    color: inherit;
}

.pattern-link:hover {
    text-decoration: none;
}

.patterns-section {
    background-color: var(--banner-bg);
    padding: 15px;
    border-radius: 5px;
}

.patterns-section h3 {
    margin-top: 0;
    font-size: 1.1em;
    color: var(--text-color);
}