:root {
  --accent: #b45309;
  --bg: #ffffff;
  --text: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --soft: #fafaf9;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { opacity: 0.85; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1080px, calc(100% - 2rem)); margin-inline: auto; }
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.header-row {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 1rem;
}
.brand {
  display: inline-flex; align-items: center; gap: .6rem;
  color: var(--text); text-decoration: none; font-weight: 700;
}
.brand img { border-radius: 8px; object-fit: cover; }
.brand b { color: var(--accent); font-weight: 700; margin-left: .15rem; }
.nav-toggle {
  display: none; width: 42px; height: 42px; border: 1px solid var(--line);
  background: #fff; border-radius: 10px; padding: 10px; cursor: pointer;
}
.nav-toggle span {
  display: block; height: 2px; background: var(--text); margin: 5px 0;
  transition: .2s;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.site-nav ul {
  display: flex; gap: 1rem; list-style: none; margin: 0; padding: 0;
}
.site-nav a {
  color: var(--muted); text-decoration: none; font-size: .95rem;
}
.site-nav a.active, .site-nav a:hover { color: var(--accent); }
.ads-top-bar {
  background: var(--soft); border-bottom: 1px solid var(--line); padding: .85rem 0;
}
#applist .applist-title {
  font-size: .85rem; color: var(--muted); margin-bottom: .55rem; font-weight: 600;
}
#ads {
  display: flex; flex-wrap: wrap; gap: .75rem;
}
#ads figure { margin: 0; text-align: center; width: 72px; }
#ads img { width: 65px; height: 65px; object-fit: cover; border-radius: 12px; margin: 0 auto; }
#ads .caption { font-size: .7rem; color: var(--muted); margin-top: .25rem; line-height: 1.3; }
.site-footer {
  margin-top: 3rem; border-top: 1px solid var(--line);
  background: var(--soft); padding: 1.5rem 0 2rem;
}
.footer-links { display: flex; flex-wrap: wrap; gap: .85rem 1.25rem; margin-bottom: .75rem; }
.footer-links a { color: var(--muted); text-decoration: none; font-size: .9rem; }
.footer-links a:hover { color: var(--accent); }
.prose-page { padding: 2rem 0 3rem; max-width: 760px; }
.prose-page h1 { font-size: 1.75rem; margin-bottom: 1rem; }
.error-page { padding: 4rem 0; text-align: center; }
.error-page h1 { font-size: 3rem; color: var(--accent); margin: 0 0 .5rem; }
@media (max-width: 860px) {
  .nav-toggle { display: inline-block; }
  .site-nav {
    position: absolute; left: 0; right: 0; top: 64px;
    background: #fff; border-bottom: 1px solid var(--line);
    display: none; padding: .75rem 1rem 1rem;
  }
  .site-nav.is-open { display: block; }
  .site-nav ul { flex-direction: column; gap: .65rem; }
}

.hero-plain { padding: 2rem 0 1rem; }
.hero-plain .tag {
  display: inline-block; color: var(--accent); font-weight: 700; font-size: .9rem;
  margin-bottom: .65rem;
}
.hero-plain h1 { font-size: clamp(1.55rem, 2.4vw, 2.05rem); line-height: 1.35; margin: 0 0 .9rem; }
.hero-plain .lead { color: var(--muted); margin: 0 0 .6rem; font-size: 1.02rem; }
.layout-toc {
  display: grid; grid-template-columns: 200px 1fr; gap: 2rem;
  padding: 1rem 0 3rem; align-items: start;
}
.mini-toc {
  position: sticky; top: 88px;
  border: 1px solid var(--line); border-radius: 14px; padding: .9rem 1rem;
  background: var(--soft);
}
.mini-toc p {
  margin: 0 0 .55rem; font-size: .78rem; color: var(--muted); font-weight: 600;
  letter-spacing: .04em;
}
.mini-toc ul { list-style: none; margin: 0; padding: 0; }
.mini-toc a {
  display: block; padding: .35rem 0; color: var(--muted); text-decoration: none; font-size: .88rem;
  border-left: 2px solid transparent; padding-left: .55rem;
}
.mini-toc a.is-active, .mini-toc a:hover {
  color: var(--accent); border-left-color: var(--accent);
}
.prose-stack section {
  padding: 1.35rem 0 1.5rem; border-bottom: 1px solid var(--line);
}
.prose-stack h2 { font-size: 1.28rem; margin: 0 0 .75rem; color: var(--text); }
.prose-stack p { margin: 0 0 .85rem; color: #292524; }
.figure-block {
  margin: 1rem 0 1.2rem; border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  background: #fff;
}
.figure-block img { width: 100%; max-height: 360px; object-fit: cover; }
.figure-block figcaption {
  padding: .65rem .9rem; font-size: .88rem; color: var(--muted); background: var(--soft);
}
.faq details {
  border: 1px solid var(--line); border-radius: 10px; padding: .75rem 1rem; margin-bottom: .65rem;
  background: #fff;
}
.faq summary { cursor: pointer; font-weight: 600; color: var(--text); }
.faq details p { margin: .55rem 0 0; color: var(--muted); }
@media (max-width: 900px) {
  .layout-toc { grid-template-columns: 1fr; }
  .mini-toc { position: static; display: flex; flex-wrap: wrap; gap: .35rem .75rem; }
  .mini-toc ul { display: flex; flex-wrap: wrap; gap: .25rem .85rem; }
  .mini-toc a { border-left: none; padding-left: 0; }
}