:root {
    --primary-color: #2c3e50;
    --accent-color: #3498db;
    --bg-color: #fdfdfd;
    --text-color: #333;
    --light-text: #666;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    color: var(--text-color);
    background: var(--bg-color);
    font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}
a { color: #227ab5; text-underline-offset: 3px; }
a:hover { color: #15567f; }
a:focus-visible, summary:focus-visible { outline: 3px solid #3498db; outline-offset: 4px; }
.page { max-width: 840px; margin: 0 auto; padding: 32px 24px 48px; }
.site-nav { display: flex; flex-wrap: wrap; gap: 12px 24px; padding-bottom: 22px; border-bottom: 1px solid #eee; }
.site-nav a { text-decoration: none; font-weight: 600; }
.site-nav [aria-current] { color: var(--primary-color); }
header { padding: 36px 0 24px; }
h1 { margin: 0 0 14px; color: var(--primary-color); font-size: clamp(1.7rem, 5vw, 2.25rem); line-height: 1.4; }
h2 { margin: 32px 0 16px; padding-left: 12px; border-left: 4px solid var(--accent-color); color: var(--primary-color); font-size: 1.3rem; line-height: 1.5; }
h3 { margin: 0 0 12px; font-size: 1.25rem; line-height: 1.5; }
p { margin: 0 0 18px; }
.meta { color: var(--light-text); font-size: .92rem; }
.intro { color: var(--light-text); }
.post-card { padding: 26px 0; border-top: 1px solid #eee; border-bottom: 1px solid #eee; }
.post-card h2 { margin: 12px 0 16px; padding: 0; border: 0; }
.post-card h2 a { text-decoration: none; }
.links { display: flex; gap: 12px 24px; flex-wrap: wrap; }
.download-box { border: 1px solid #d8e5ee; border-radius: 8px; background: #f5f9fc; padding: 22px; margin: 28px 0; }
.download-box h2 { margin-top: 0; }
.download-button { display: inline-block; padding: 10px 18px; background: #227ab5; border-radius: 5px; color: white; font-weight: 600; text-decoration: none; }
.download-button:hover { background: #15567f; color: white; }
.file-info { margin: 12px 0 0; color: var(--light-text); font-size: .9rem; }
code { font: .92em/1.5 Consolas, monospace; background: #edf1f4; border-radius: 3px; padding: 2px 4px; }
.checksum { display: block; overflow-wrap: anywhere; white-space: normal; margin-top: 6px; }
ol, ul { padding-left: 1.5em; }
li { margin-bottom: 8px; }
figure { margin: 24px 0; }
figure img { display: block; width: 100%; height: auto; border: 1px solid #eee; border-radius: 6px; }
figcaption { margin-top: 8px; color: var(--light-text); font-size: .9rem; }
details { margin-top: 16px; }
summary { cursor: pointer; color: #227ab5; }
footer { margin-top: 44px; padding-top: 20px; border-top: 1px solid #eee; color: var(--light-text); font-size: .9rem; }
@media (max-width: 540px) {
    .page { padding: 20px 18px 32px; }
    header { padding-top: 26px; }
    .download-box { padding: 18px; }
    .download-button { width: 100%; text-align: center; }
}