/* rsway.net 文章共用樣式 — 中性學術風 */
:root {
  --ink: #1A2238;
  --ink-2: #4A5567;
  --ink-3: #8794A8;
  --paper: #FAF7F2;
  --paper-2: #F2EDE4;
  --surface: #FFFFFF;
  --accent: #B8442B;
  --accent-light: #F4E4DD;
  --line: #E5DCD0;
  --shadow: 0 2px 12px rgba(26,34,56,0.06);
  --font-ui: "Inter", "Noto Sans TC", -apple-system, sans-serif;
  --font-serif: "Noto Serif TC", serif;
  --font-kai: "Klee One", "Noto Serif TC", serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-ui);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "palt";
}
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 0.2s; }
a:hover { border-bottom-color: var(--accent); }

.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250,247,242,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 880px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-serif); font-weight: 700; font-size: 1.05rem; letter-spacing: 0.04em; color: var(--ink); border: none; }
.brand-mark { width: 30px; height: 30px; background: var(--ink); color: var(--paper); border-radius: 8px; display: grid; place-items: center; font-family: var(--font-serif); font-weight: 700; font-size: 0.95rem; }
.brand-name .accent { color: var(--accent); }
.nav { display: flex; gap: 22px; font-size: 0.9rem; }
.nav a { color: var(--ink-2); border: none; }
.nav a:hover { color: var(--accent); }
@media (max-width: 640px) { .nav { display: none; } }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }

article {
  padding: 60px 0 100px;
}
article header.post-head {
  text-align: center;
  margin-bottom: 56px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--line);
}
.post-cat {
  display: inline-block;
  font-family: var(--font-kai);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.16em;
  margin-bottom: 18px;
  padding: 4px 14px;
  border: 1px solid var(--accent);
  border-radius: 100px;
}
article h1 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 22px;
  letter-spacing: -0.01em;
}
.post-meta {
  display: flex; justify-content: center; gap: 18px; flex-wrap: wrap;
  font-size: 0.84rem; color: var(--ink-3); letter-spacing: 0.04em;
}
.post-meta span { display: inline-flex; align-items: center; gap: 5px; }

article .body {
  font-family: var(--font-ui);
  font-size: 1.02rem;
  color: var(--ink);
}
article .body p { margin-bottom: 22px; }
article .body h2 {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3.4vw, 28px);
  font-weight: 700;
  margin: 56px 0 22px;
  padding-top: 8px;
  letter-spacing: -0.005em;
  line-height: 1.45;
}
article .body h3 {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 700;
  margin: 36px 0 16px;
  letter-spacing: -0.005em;
}
article .body strong { font-weight: 700; color: var(--ink); }
article .body ul, article .body ol { margin: 0 0 22px 24px; }
article .body li { margin-bottom: 10px; }
article .body blockquote {
  font-family: var(--font-kai);
  font-size: 1.08rem;
  color: var(--ink);
  padding: 22px 26px;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 10px 10px 0;
  margin: 28px 0;
  line-height: 1.85;
}
article .body code {
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 0.92em;
  background: var(--paper-2);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}
article .body .callout {
  background: var(--accent-light);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 28px 0;
  border: 1px solid rgba(184,68,43,0.18);
}
article .body .callout strong { color: var(--accent); }

.post-foot {
  margin-top: 56px;
  padding: 32px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  text-align: center;
}
.post-foot h3 { font-family: var(--font-serif); margin-bottom: 10px; font-size: 1.15rem; }
.post-foot p { color: var(--ink-2); margin-bottom: 16px; font-size: 0.92rem; }
.post-foot a {
  display: inline-block;
  padding: 10px 22px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 100px;
  border: none;
  font-size: 0.9rem;
}
.post-foot a:hover { background: var(--accent); }

footer {
  text-align: center;
  padding: 40px 24px 60px;
  color: var(--ink-3);
  font-size: 0.82rem;
  border-top: 1px solid var(--line);
}