*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --green:   #1a7a4c;
  --green-d: #0d5234;
  --green-l: #e8f5ee;
  --gray:    #555;
  --border:  #e0e0e0;
  --light:   #f8f9fa;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
  background: var(--light);
  color: #222;
  line-height: 1.8;
}

/* ── Top bar ── */
.topbar {
  background: var(--green);
  padding: .7rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.topbar a {
  color: rgba(255,255,255,.85);
  text-decoration: none;
  font-size: .9rem;
  display: flex;
  align-items: center;
  gap: .3rem;
}
.topbar a:hover { color: #fff; }
.topbar .sep { color: rgba(255,255,255,.4); }
.topbar .site { font-weight: 600; color: #fff; }
.topbar .lang-switch {
  margin-left: auto;
  display: flex;
  gap: .4rem;
}
.topbar .lang-switch a {
  padding: .15rem .5rem;
  border: 1px solid rgba(255,255,255,.5);
  border-radius: 4px;
  font-size: .8rem;
}
.topbar .lang-switch a.active {
  background: rgba(255,255,255,.25);
  color: #fff;
}

/* ── Article ── */
article {
  max-width: 780px;
  margin: 2.5rem auto;
  padding: 0 1.5rem 4rem;
}

header.post-header { margin-bottom: 2rem; }
header.post-header h1 {
  font-size: 1.8rem;
  line-height: 1.3;
  margin-bottom: .6rem;
  color: #111;
}
.meta {
  font-size: .88rem;
  color: var(--gray);
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.2rem;
  align-items: center;
}
.tag {
  display: inline-block;
  background: var(--green-l);
  color: var(--green-d);
  border-radius: 4px;
  padding: .1rem .5rem;
  font-size: .8rem;
}

/* ── Post body ── */
.post-body { font-size: 1rem; }
.post-body p  { margin-bottom: 1.1rem; }
.post-body h2 { font-size: 1.25rem; margin: 2rem 0 .7rem; color: var(--green-d); }
.post-body h3 { font-size: 1.05rem; margin: 1.5rem 0 .5rem; }
.post-body ul, .post-body ol { margin: .8rem 0 1rem 1.5rem; }
.post-body li { margin-bottom: .4rem; }
.post-body pre {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 1rem 1.2rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: .88rem;
  margin: 1rem 0 1.3rem;
}
.post-body code {
  font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
}
.post-body p code, .post-body li code {
  background: #eef;
  padding: .1em .3em;
  border-radius: 3px;
  font-size: .9em;
}
.post-body blockquote {
  border-left: 3px solid var(--green);
  padding: .5rem 1rem;
  color: #555;
  margin: 1rem 0;
  background: var(--green-l);
  border-radius: 0 6px 6px 0;
}
.post-body img {
  max-width: 100%;
  border-radius: 6px;
  margin: .8rem 0;
}
.post-body a { color: var(--green); }
.post-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* ── Original link ── */
.original-link {
  margin-top: 2.5rem;
  padding: 1rem 1.2rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .9rem;
  color: var(--gray);
}
.original-link a { color: var(--green); }

/* ── Footer ── */
footer {
  text-align: center;
  padding: 1.5rem;
  font-size: .85rem;
  color: var(--gray);
  border-top: 1px solid var(--border);
}

@media (max-width: 500px) {
  header.post-header h1 { font-size: 1.4rem; }
}