:root {
  color: #202b28;
  background: #fbfaf5;
  --accent: #235e46;
  --muted: #4e6058;
  --line: #d4dbcf;
  font-family: 'Source Sans 3', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}
body { margin: 0; }
.frame { width: min(100% - 2.5rem, 67rem); margin-inline: auto; }
.masthead { background: #153d31; color: #fffdf3; }
.masthead nav { display: flex; align-items: center; justify-content: space-between; min-height: 4rem; gap: 1rem; }
.masthead a { color: inherit; text-decoration: none; }
.brand { font-size: 1.5rem; font-weight: 800; }
.brand span { color: #cde794; }
.brand small { padding-left: .4rem; font-size: .9rem; font-weight: 500; }
main { padding-block: clamp(2.5rem, 7vw, 5rem); }
h1, h2 { font-family: 'DM Serif Text', Georgia, 'Songti SC', serif; }
h1 { max-width: 24ch; margin: 0 0 1.75rem; font-size: clamp(2.15rem, 5vw, 4rem); line-height: 1.14; }
a { color: var(--accent); text-underline-offset: .2em; }
a:hover { text-decoration-thickness: .15em; }
.entries { border-top: 2px solid var(--accent); }
.entry { display: grid; grid-template-columns: 9rem 1fr; gap: .65rem 1rem; padding-block: 1.35rem; border-bottom: 1px solid var(--line); }
.entry h2 { margin: 0; font-size: clamp(1.25rem, 3vw, 1.85rem); }
.entry a { color: inherit; }
time { color: var(--muted); font-variant-numeric: tabular-nums; }
.article-header time { display: block; margin-bottom: .65rem; }
.prose { max-width: 49rem; font-size: 1.09rem; line-height: 1.8; overflow-wrap: anywhere; }
.prose h2 { margin-top: 2.2em; line-height: 1.3; }
.prose img { display: block; max-width: 100%; height: auto; margin-block: 1.5rem; }
.terms { display: flex; flex-wrap: wrap; gap: .85rem; margin-top: 1rem; }
.footer { padding-block: 1.4rem; border-top: 1px solid var(--line); }
@media (max-width: 36rem) { .entry { grid-template-columns: 1fr; } }
.cta { display: inline-block; padding: .45rem 1rem; background: var(--accent); color: #fffdf3; }

.skip-link {
  position: absolute;
  z-index: 1;
  left: 1rem;
  top: 1rem;
  padding: .65rem 1rem;
  background: #fffdf3;
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; }
:focus-visible { outline: 2px solid currentColor; outline-offset: .25rem; }
.blog-intro { padding-bottom: clamp(2rem, 5vw, 3.5rem); }
.blog-intro h1 { margin-bottom: 1rem; }
.blog-intro > p { max-width: 36rem; font-size: 1.23rem; line-height: 1.55; }
.topic-links { display: flex; flex-wrap: wrap; gap: .65rem 1rem; margin-top: 1.5rem; }
.topic-links a { padding: .4rem .75rem; border: 1px solid var(--line); border-radius: .3rem; }
.guide-section { padding-block: 1.4rem 2.4rem; border-top: 2px solid var(--accent); }
.guide-section h2 { margin: 0 0 1.1rem; font-size: clamp(1.55rem, 3vw, 2.2rem); }
.guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.guide { padding: clamp(1rem, 3vw, 1.65rem); border: 1px solid var(--line); background: #fffdf8; }
.guide h3 { margin: .5rem 0 .75rem; font-size: clamp(1.2rem, 2.4vw, 1.5rem); line-height: 1.35; }
.guide p { margin: 0; line-height: 1.6; }
.guide .guide-language { color: var(--muted); font-size: .85rem; }
.article-meta { display: flex; flex-wrap: wrap; gap: .4rem 1rem; margin-bottom: .8rem; color: var(--muted); }
.article-meta time { margin: 0; }
.article-summary { max-width: 42rem; font-size: 1.2rem; line-height: 1.6; }
.article-note { max-width: 47rem; padding: .8rem 1rem; border-left: .2rem solid var(--accent); background: #eef2e8; line-height: 1.6; }
@media (max-width: 40rem) { .guide-grid { grid-template-columns: 1fr; } }