:root {
    --bg-color: #f7fbff;
    --text-color: #2c3e50;
    --text-muted: #5c7080;
    --card-bg: #ffffff;
    --primary-color: #0070f3;
    --primary-light: #e6f1ff;
    --border-color: #e3e8ee;
    --nav-bg: #ffffff;
    --code-bg: #f3f6f9;
    --blockquote-bg: #f0f7ff;
    --blockquote-border: #4a90e2;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --text-color: #f1f5f9;
        --text-muted: #94a3b8;
        --card-bg: #1e293b;
        --primary-color: #38bdf8;
        --primary-light: #0c4a6e;
        --border-color: #334155;
        --nav-bg: #1e293b;
        --code-bg: #0f172a;
        --blockquote-bg: #1e293b;
        --blockquote-border: #38bdf8;
    }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.75;
}
a { color: var(--primary-color); text-decoration: none; transition: color 0.2s; }
a:hover { text-decoration: underline; }
.container { max-width: 860px; margin: 0 auto; padding: 0 20px; }
.navbar {
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}
.nav-container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.nav-brand { font-size: 1.2rem; font-weight: bold; color: var(--primary-color); }
.nav-links { display: flex; gap: 16px; }
.nav-links a { font-size: 0.95rem; color: var(--text-color); font-weight: 500; }
.nav-links a:hover { color: var(--primary-color); text-decoration: none; }
.article-container {
    background-color: var(--card-bg);
    padding: 40px 50px;
    margin-top: 40px;
    margin-bottom: 40px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}
@media (max-width: 600px) {
    .article-container { padding: 25px 20px; margin-top: 20px; border-radius: 12px; }
}
h1, h2, h3, h4, h5 { color: var(--text-color); font-weight: 700; margin-top: 2em; margin-bottom: 1em; }
h1 { font-size: 2.2rem; margin-top: 0; border-bottom: 2px solid var(--border-color); padding-bottom: 12px; }
h2 { font-size: 1.6rem; border-bottom: 1px dashed var(--border-color); padding-bottom: 8px; }
h3 { font-size: 1.3rem; }
p { margin-bottom: 1.2em; }
blockquote {
    background-color: var(--blockquote-bg);
    border-left: 5px solid var(--blockquote-border);
    padding: 16px 20px;
    margin: 1.5em 0;
    border-radius: 0 8px 8px 0;
    color: var(--text-color);
}
blockquote p:last-child { margin-bottom: 0; }
code {
    background-color: var(--code-bg);
    color: var(--primary-color);
    padding: 3px 6px;
    border-radius: 6px;
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 0.9em;
    word-break: break-word;
}
pre {
    background-color: var(--code-bg);
    padding: 16px;
    border-radius: 10px;
    overflow-x: auto;
    margin-bottom: 1.5em;
    border: 1px solid var(--border-color);
}
pre code { background-color: transparent; color: inherit; padding: 0; }
ul, ol { margin-bottom: 1.5em; padding-left: 24px; }
li { margin-bottom: 0.5em; }
table { width: 100%; border-collapse: collapse; margin-bottom: 1.5em; display: block; overflow-x: auto; }
th, td { padding: 12px 16px; border: 1px solid var(--border-color); }
th { background-color: var(--code-bg); font-weight: 600; }
img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 1.5em 0;
    display: block;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.step-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
    box-shadow: 0 2px 12px rgba(0,0,0,0.02);
}
.step-card:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.06); border-color: var(--primary-color); }
.step-badge {
    display: inline-block;
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 12px;
}
.step-title { font-size: 1.3rem; font-weight: bold; margin-bottom: 8px; margin-top: 0; border: none; }
.step-title a { color: var(--text-color); }
.step-title a:hover { color: var(--primary-color); text-decoration: none; }
.step-desc { color: var(--text-muted); margin-bottom: 16px; }
.btn-read {
    display: inline-block;
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: background-color 0.2s;
}
.btn-read:hover { background-color: var(--primary-color); color: #fff; text-decoration: none; }
.page-nav {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 50px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}
.btn-nav {
    display: inline-flex;
    align-items: center;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s;
}
.btn-nav:hover { border-color: var(--primary-color); color: var(--primary-color); text-decoration: none; }
.site-footer { padding: 30px 0; text-align: center; color: var(--text-muted); font-size: 0.9rem; }