@import url('https://fonts.googleapis.com/css2?family=Noto+Naskh+Arabic:wght@400;500;600;700&family=Noto+Sans+Arabic:wght@300;400;500;700&display=swap');

/* ===== 变量 ===== */
:root {
  --clr-primary: #5cc6b0;
  --clr-primary-dark: #3ea090;
  --clr-sand: #d4c4a8;
  --clr-sand-light: #ede5d4;
  --clr-sand-dark: #bfad93;
  --clr-ink: #172623;
  --clr-ink-soft: #2e4340;
  --clr-terracotta: #c67b5c;
  --clr-terracotta-light: #e8a98c;
  --clr-olive: #6b7b3c;
  --clr-bg: #f7f2ea;
  --clr-bg-card: #faf6ef;
  --clr-border: #d9cdb6;
  --clr-text: #2a1f1a;
  --clr-text-soft: #5a4a3a;
  --clr-text-muted: #8a7a6a;

  --radius-card: 28px;
  --radius-pill: 999px;
  --radius-sm: 12px;

  --shadow-soft: 0 4px 24px rgba(23,38,35,0.08);
  --shadow-card: 0 2px 12px rgba(23,38,35,0.06);

  --font-main: 'Noto Naskh Arabic', 'Noto Sans Arabic', Georgia, 'Noto Serif SC', serif;
  --font-ui: 'Noto Sans Arabic', system-ui, -apple-system, sans-serif;

  --bottom-nav-h: 64px;
  --header-h: 60px;
  --max-prose: 720px;
  --max-site: 1100px;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 17px; scroll-behavior: smooth; }
body {
  background: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--font-main);
  line-height: 1.7;
  padding-bottom: calc(var(--bottom-nav-h) + 8px);
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--clr-primary-dark); text-decoration: none; }
a:hover { color: var(--clr-terracotta); }
p { margin-bottom: .75em; }
h1,h2,h3,h4 {
  font-family: var(--font-ui);
  color: var(--clr-ink);
  line-height: 1.3;
  font-weight: 700;
}
h1 { font-size: clamp(1.5rem,4vw,2.2rem); margin-bottom: .5em; }
h2 { font-size: clamp(1.2rem,3vw,1.6rem); margin-bottom: .4em; }
h3 { font-size: 1.1rem; margin-bottom: .35em; }

/* ===== 纹理叠加 ===== */
.site-wrap {
  position: relative;
  min-height: 100vh;
}
.site-wrap::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: .5;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(247,242,234,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--clr-border);
  height: var(--header-h);
}
.header-inner {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.brand-logo {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 1rem;
  color: var(--clr-ink);
  white-space: nowrap;
  flex-shrink: 0;
  padding: .4rem .75rem;
  background: var(--clr-primary);
  color: #fff;
  border-radius: var(--radius-pill);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.brand-logo:hover { background: var(--clr-primary-dark); color: #fff; }

/* 导航：header > nav > p > a */
.top-nav {
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}
.top-nav::-webkit-scrollbar { display: none; }
.top-nav p {
  display: flex;
  gap: .4rem;
  flex-wrap: nowrap;
  align-items: center;
}
.top-nav p a {
  white-space: nowrap;
  font-family: var(--font-ui);
  font-size: .82rem;
  color: var(--clr-ink-soft);
  padding: .45rem .75rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: background .2s, color .2s;
}
.top-nav p a:hover {
  background: var(--clr-sand);
  color: var(--clr-ink);
  border-color: var(--clr-border);
}

/* ===== 底部固定导航 ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 300;
  height: var(--bottom-nav-h);
  background: var(--clr-ink);
  display: flex;
  align-items: center;
  padding: 0 1rem;
  gap: .5rem;
  box-shadow: 0 -2px 16px rgba(23,38,35,0.18);
}
.bnav-brand {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: .85rem;
  color: var(--clr-primary);
  white-space: nowrap;
  flex-shrink: 0;
  padding: .5rem .75rem;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.bnav-brand:hover { color: var(--clr-sand); }
.bnav-pills {
  flex: 1;
  display: flex;
  gap: .35rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.bnav-pills::-webkit-scrollbar { display: none; }
.pill {
  font-family: var(--font-ui);
  font-size: .78rem;
  color: var(--clr-sand);
  background: var(--clr-ink-soft);
  border: 1px solid rgba(92,198,176,.25);
  border-radius: var(--radius-pill);
  padding: .4rem .75rem;
  white-space: nowrap;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: background .2s, color .2s;
}
.pill:hover { background: var(--clr-primary); color: #fff; border-color: var(--clr-primary); }
.bnav-contact {
  font-family: var(--font-ui);
  font-size: .8rem;
  color: var(--clr-terracotta-light);
  white-space: nowrap;
  flex-shrink: 0;
  padding: .5rem .75rem;
  border: 1px solid rgba(198,123,92,.3);
  border-radius: var(--radius-pill);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.bnav-contact:hover { background: var(--clr-terracotta); color: #fff; }

/* ===== 通用工具 ===== */
.eyebrow-tag {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--clr-primary-dark);
  background: rgba(92,198,176,.12);
  border: 1px solid rgba(92,198,176,.3);
  border-radius: var(--radius-pill);
  padding: .2rem .75rem;
  margin-bottom: .6rem;
}
.subtitle {
  color: var(--clr-text-soft);
  font-size: .95rem;
  margin-bottom: .75em;
  line-height: 1.6;
}
.date-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: .75rem;
}
.pub-date, .mod-date {
  font-family: var(--font-ui);
  font-size: .8rem;
  color: var(--clr-text-muted);
  background: var(--clr-sand-light);
  padding: .15rem .6rem;
  border-radius: var(--radius-sm);
}
.back-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-ui);
  font-size: .85rem;
  color: var(--clr-text-muted);
  min-height: 40px;
  padding: .25rem 0;
}
.back-link:hover { color: var(--clr-primary-dark); }

/* ===== 按钮 ===== */
.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: .95rem;
  border-radius: var(--radius-pill);
  padding: .65rem 1.5rem;
  min-height: 44px;
  cursor: pointer;
  transition: transform .18s ease-out, background .2s;
  text-decoration: none;
}
.btn-primary {
  background: var(--clr-primary);
  color: #fff;
  border: 2px solid var(--clr-primary);
}
.btn-primary:hover { background: var(--clr-primary-dark); color: #fff; transform: translateY(-2px); }
.btn-secondary {
  background: transparent;
  color: var(--clr-ink);
  border: 2px solid var(--clr-border);
}
.btn-secondary:hover { border-color: var(--clr-primary); color: var(--clr-primary-dark); transform: translateY(-2px); }

/* ===== 卡片 ===== */
.card {
  background: var(--clr-bg-card);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  transition: border-color .2s, transform .2s ease-out;
}
.card:hover { border-color: var(--clr-primary); transform: translateY(-3px); }
.card h3 { font-size: 1rem; }
.card h3 a { color: var(--clr-ink); }
.card h3 a:hover { color: var(--clr-primary-dark); }
.card-date { font-size: .8rem; color: var(--clr-text-muted); }
.card-link {
  font-family: var(--font-ui);
  font-size: .85rem;
  color: var(--clr-primary-dark);
  font-weight: 600;
  margin-top: auto;
}
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
}

/* ===== 侧边栏 ===== */
.sidebar-nav {
  flex-shrink: 0;
  width: 220px;
  background: var(--clr-sand-light);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-card);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .35rem;
  align-self: start;
  position: sticky;
  top: calc(var(--header-h) + 12px);
}
.sidebar-nav h2 {
  font-size: 1rem;
  color: var(--clr-ink);
  margin-bottom: .1rem;
}
.sidebar-nav .subtitle { font-size: .82rem; margin-bottom: .5rem; }
.sidebar-link {
  display: flex;
  align-items: center;
  font-family: var(--font-ui);
  font-size: .85rem;
  color: var(--clr-text-soft);
  padding: .4rem .6rem;
  border-radius: var(--radius-sm);
  min-height: 40px;
  transition: background .15s, color .15s;
  line-height: 1.4;
}
.sidebar-link:hover { background: var(--clr-primary); color: #fff; }
.sidebar-link.sidebar-home { color: var(--clr-text-muted); font-size: .8rem; }
.sidebar-divider { border: none; border-top: 1px solid var(--clr-border); margin: .4rem 0; }
.sidebar-section-title { font-family: var(--font-ui); font-size: .78rem; color: var(--clr-text-muted); padding: .2rem .6rem; }

/* ===== 正文 ===== */
.prose-body {
  flex: 1;
  min-width: 0;
  max-width: var(--max-prose);
}
.prose-body h2 { margin-top: 1.75em; margin-bottom: .4em; }
.prose-body h3 { margin-top: 1.25em; margin-bottom: .3em; }
.prose-body p { margin-bottom: .9em; }
.prose-body ul, .prose-body ol { padding-left: 1.5em; margin-bottom: .9em; }
.prose-body li { margin-bottom: .35em; line-height: 1.65; }
.prose-body a { color: var(--clr-primary-dark); text-decoration: underline; text-underline-offset: 2px; }
.prose-body a:hover { color: var(--clr-terracotta); }
.prose-body code {
  font-size: .88em;
  background: var(--clr-sand-light);
  border: 1px solid var(--clr-border);
  border-radius: 6px;
  padding: .1em .4em;
  font-family: 'Courier New', monospace;
}
.prose-body pre {
  background: var(--clr-ink);
  color: var(--clr-sand);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin-bottom: 1em;
  font-size: .88em;
}
.prose-body pre code { background: none; border: none; padding: 0; color: inherit; }
.prose-body blockquote {
  border-left: 4px solid var(--clr-primary);
  background: rgba(92,198,176,.07);
  padding: .75rem 1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: .9em;
  color: var(--clr-text-soft);
}
.prose-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1em;
  font-size: .92rem;
}
.prose-body th, .prose-body td {
  border: 1px solid var(--clr-border);
  padding: .6rem .85rem;
  text-align: left;
}
.prose-body th { background: var(--clr-sand-light); font-weight: 600; }

/* ===== 表格（guide list）===== */
.table-figure { overflow-x: auto; }
.guide-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
  font-family: var(--font-ui);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1.5px solid var(--clr-border);
}
.guide-table tr:first-child th,
.guide-table tr:first-child td {
  background: var(--clr-ink);
  color: var(--clr-sand);
  font-weight: 600;
  padding: .75rem 1rem;
}
.guide-table tbody tr { border-bottom: 1px solid var(--clr-border); }
.guide-table tbody tr:nth-child(even) { background: var(--clr-sand-light); }
.guide-table tbody tr:hover { background: rgba(92,198,176,.08); }
.guide-table td { padding: .7rem 1rem; vertical-align: top; }
.guide-table td a { color: var(--clr-primary-dark); font-weight: 500; }
.guide-table td a:hover { color: var(--clr-terracotta); }
.guide-table td time { font-size: .8rem; color: var(--clr-text-muted); }

/* ===== Hero（首页）===== */
.hero-section {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-height: 45vh;
  position: relative;
}
.hero-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .6rem;
  flex: 1;
}
.hero-badge {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  background: var(--clr-terracotta);
  color: #fff;
  border-radius: var(--radius-pill);
  padding: .25rem .85rem;
}
.hero-lead { font-size: 1rem; color: var(--clr-text-soft); max-width: 520px; }
.hero-text .btn-primary, .hero-text .btn-secondary { margin-top: .25rem; }
.hero-figure {
  width: 100%;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--clr-sand-light);
  border: 1.5px solid var(--clr-border);
  min-height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-placeholder, .feature-hero-placeholder, .about-brand-fig, .faq-deco-fig, .privacy-deco-fig, .guide-header-section .guide-step-badge, .default-deco-fig {
  background: linear-gradient(135deg, var(--clr-sand-light) 60%, rgba(92,198,176,.15));
}
.hero-icon, .about-brand-icon, .faq-deco-icon, .privacy-icon {
  font-size: 3rem;
  opacity: .5;
}
.hero-img { width: 100%; height: 100%; object-fit: cover; }

/* ===== 布局：带侧边栏的内容区 ===== */
.content-section,
.feature-body-section,
.guide-body-section,
.faq-body-section,
.about-body-section,
.privacy-body-section,
.default-body-section {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 2rem 1.25rem;
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  position: relative;
  z-index: 1;
}

/* ===== 首页专区段落 ===== */
.prose-section { padding-top: 0; }
.features-section,
.guides-section {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 2rem 1.25rem;
  position: relative;
  z-index: 1;
}
.features-section h2, .guides-section h2 { margin-bottom: .25rem; }

/* ===== feature hero ===== */
.feature-hero {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 2rem 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  min-height: 45vh;
  position: relative;
  z-index: 1;
}
.feature-hero-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .5rem;
}
.feature-hero-fig {
  width: 100%;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--clr-sand-light);
  border: 1.5px solid var(--clr-border);
  min-height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.related-section {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2rem;
  z-index: 1;
  position: relative;
}

/* ===== guide header ===== */
.guide-header-section {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 2rem 1.25rem 1rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  position: relative;
  z-index: 1;
}
.guide-step-badge {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--clr-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  margin: 0;
}
.step-num {
  font-family: var(--font-ui);
  font-size: .72rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: .04em;
  text-align: center;
}
.guide-meta-aside, .about-intro-aside, .faq-intro-aside, .privacy-intro-aside {
  flex: 1;
}

/* ===== about ===== */
.about-top-section {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 1.5rem;
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  position: relative;
  z-index: 1;
}
.about-brand-fig {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--clr-border);
  background: var(--clr-sand-light);
}
.about-brand-fig figcaption {
  font-family: var(--font-ui);
  font-size: .65rem;
  color: var(--clr-text-muted);
  margin-top: .2rem;
  text-align: center;
}
.about-cta-section {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 2rem 1.25rem 2.5rem;
  position: relative;
  z-index: 1;
}
.cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1rem;
}

/* ===== faq ===== */
.faq-hero-section {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 2rem 1.25rem 1rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  position: relative;
  z-index: 1;
}
.faq-deco-fig {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--clr-border);
}
.faq-deco-icon { font-size: 2.5rem; opacity: .5; }

/* ===== privacy ===== */
.privacy-header-section {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 2rem 1.25rem 1rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  position: relative;
  z-index: 1;
}
.privacy-deco-fig {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--clr-border);
  background: var(--clr-sand-light);
}
.privacy-icon { font-size: 2rem; opacity: .55; }

/* ===== default ===== */
.default-body-section {
  flex-direction: column;
}
.default-deco-fig {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--clr-border);
  background: var(--clr-sand-light);
  margin-bottom: 1rem;
}

/* ===== 页脚（footer 极简：仅 p + small）===== */
.site-footer {
  max-width: var(--max-site);
  margin: 2.5rem auto 0;
  padding: 1.75rem 1.25rem 1.25rem;
  border-top: 1.5px solid var(--clr-border);
  display: flex;
  flex-direction: column;
  gap: .6rem;
  position: relative;
  z-index: 1;
}
.footer-brand {
  font-family: var(--font-ui);
  font-weight: 600;
  color: var(--clr-ink);
  font-size: .95rem;
}
.site-footer small {
  font-size: .8rem;
  color: var(--clr-text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-items: center;
}
.site-footer small a { color: var(--clr-text-muted); text-decoration: underline; }
.site-footer small a:hover { color: var(--clr-primary-dark); }

/* ===== Scroll Reveal ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .55s ease-out, transform .55s ease-out;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
[data-parallax] { will-change: transform; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  [data-parallax] { will-change: auto; }
  html { scroll-behavior: auto; }
}

/* ===== 响应式 ===== */
@media (min-width: 768px) {
  .hero-section {
    flex-direction: row;
    align-items: center;
    min-height: 45vh;
  }
  .hero-text { flex: 1.2; }
  .hero-figure {
    flex: 1;
    min-height: 260px;
  }
  .feature-hero {
    flex-direction: row;
    align-items: center;
  }
  .feature-hero-text { flex: 1.2; }
  .feature-hero-fig { flex: 1; min-height: 200px; }
}

@media (max-width: 767px) {
  :root { --header-h: 56px; }
  .site-header .top-nav { display: none; }
  .content-section,
  .feature-body-section,
  .guide-body-section,
  .faq-body-section,
  .about-body-section,
  .privacy-body-section,
  .default-body-section {
    flex-direction: column;
  }
  .sidebar-nav {
    width: 100%;
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: .35rem;
    padding: 1rem;
  }
  .sidebar-nav h2, .sidebar-nav .subtitle { width: 100%; }
  .sidebar-link { flex: 0 0 auto; }
  .about-top-section { flex-direction: column; }
  .guide-header-section { flex-direction: column; gap: 1rem; }
  .faq-hero-section { flex-direction: column; gap: 1rem; }
  .privacy-header-section { flex-direction: column; gap: 1rem; }
  .cards-grid { grid-template-columns: 1fr 1fr; }
  .hero-section { min-height: auto; padding: 1.75rem 1rem 1.5rem; }
  .hero-figure { min-height: 160px; }
  .cta-links { flex-direction: column; }
  .cta-links .btn-primary, .cta-links .btn-secondary { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  html { font-size: 16px; }
  .cards-grid { grid-template-columns: 1fr; }
  .hero-text h1 { font-size: 1.4rem; }
  .bottom-nav { padding: 0 .5rem; gap: .25rem; }
  .bnav-brand { font-size: .78rem; padding: .4rem .5rem; }
  .pill { font-size: .72rem; padding: .35rem .55rem; }
}

/* ===== FAQ 手风琴样式辅助 ===== */
.faq-prose details {
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  margin-bottom: .75rem;
  background: var(--clr-bg-card);
}
.faq-prose summary {
  padding: .85rem 1rem;
  cursor: pointer;
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: .95rem;
  color: var(--clr-ink);
  list-style: none;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.faq-prose summary::-webkit-details-marker { display: none; }
.faq-prose summary::after {
  content: '+';
  margin-left: auto;
  color: var(--clr-primary);
  font-size: 1.2rem;
  transition: transform .2s;
}
.faq-prose details[open] summary::after {
  content: '−';
}
.faq-prose details > *:not(summary) {
  padding: 0 1rem .9rem;
}

/* ===== 打印 ===== */
@media print {
  .bottom-nav, .site-header, .sidebar-nav { display: none; }
  body { padding-bottom: 0; }
}