/* ============================================================
   趣万词 · 学习指南（内容页）样式 · v3 编辑部式
   与首页同源：纸白底、深林绿、细线分区、无阴影卡片
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
img, svg { display: block; max-width: 100%; }
::selection { background: rgba(23, 89, 74, 0.16); color: var(--brand-deep); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; }

:root {
  --paper: #F6F4EF;
  --paper-2: #FBF9F5;
  --card: #FFFFFF;
  --brand: #17594A;
  --brand-deep: #0F4034;
  --brand-soft: #E8F0EC;
  --ink: #14181B;
  --ink-2: #3D464C;
  --ink-3: #5E686E;
  --ink-4: #9AA2A6;
  --line: #E2DED5;
  --line-2: #EFECE4;
  --clay: #B4552F;
  --radius: 12px;
}

/* ---------- 顶部导航 ---------- */
.site-nav {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-nav-inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-nav a.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
  letter-spacing: 0.01em;
}
.site-nav a.brand:hover { text-decoration: none; }
.brand-mark { display: inline-flex; align-items: center; justify-content: center; }
/* 与应用图标一致 */
.brand-logo { width: 32px; height: 32px; border-radius: 9px; display: block; object-fit: cover; }
.nav-right { display: flex; align-items: center; gap: 20px; font-size: 13.5px; }
.nav-right a { color: var(--ink-2); transition: color .16s ease; }
.nav-right a:hover { color: var(--ink); text-decoration: none; }
.nav-cta {
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--brand);
  color: #fff !important;
  font-weight: 600;
  font-size: 13.5px;
  transition: background-color .16s ease;
}
.nav-cta:hover { background: var(--brand-deep); text-decoration: none; }

/* ---------- 主体 ---------- */
main {
  max-width: 820px;
  margin: 0 auto;
  padding: 32px 20px 72px;
}
.breadcrumb {
  font-size: 12.5px;
  color: var(--ink-3);
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}
.breadcrumb a { color: var(--ink-3); transition: color .16s ease; }
.breadcrumb a:hover { color: var(--brand); text-decoration: none; }
.breadcrumb span { margin: 0 7px; color: var(--line); }

article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 44px 56px 48px;
  box-shadow: none;
}
article h1 {
  margin: 0 0 10px;
  font-size: clamp(25px, 3vw, 33px);
  line-height: 1.36;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.022em;
  text-wrap: balance;
}
.meta {
  color: var(--ink-3);
  font-size: 12.5px;
  padding-bottom: 18px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--line);
  letter-spacing: 0.02em;
}
.meta span + span::before { content: " · "; margin: 0 4px; color: var(--line); }

article h2 {
  margin: 38px 0 14px;
  font-size: 21px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--ink);
  border-left: 2px solid var(--brand);
  padding-left: 14px;
  letter-spacing: -0.015em;
  scroll-margin-top: 76px;
}
article h3 {
  margin: 26px 0 10px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}
article p { margin: 14px 0; color: var(--ink-2); }
article ul, article ol { margin: 14px 0; padding-left: 22px; color: var(--ink-2); }
article li { margin: 7px 0; }
article li::marker { color: var(--ink-4); }
article strong { color: var(--ink); font-weight: 600; }
article blockquote {
  margin: 22px 0;
  padding: 4px 0 4px 18px;
  background: none;
  border-left: 2px solid var(--ink-4);
  border-radius: 0;
  color: var(--ink-2);
}
article blockquote p { margin: 0; color: inherit; }

article table {
  width: 100%;
  border-collapse: collapse;
  margin: 22px 0;
  font-size: 14.5px;
}
article th, article td {
  border: 0;
  border-bottom: 1px solid var(--line);
  padding: 10px 12px 10px 0;
  text-align: left;
  vertical-align: top;
}
article th {
  background: none;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 1px solid var(--ink-4);
  font-size: 12.5px;
  letter-spacing: 0.06em;
}
article td { color: var(--ink-2); }
article tbody tr:last-child td { border-bottom: 1px solid var(--line); }
article th + th, article td + td { padding-left: 16px; }

.lead {
  font-size: 16px;
  color: var(--ink-2);
  background: var(--paper-2);
  border: 0;
  border-left: 2px solid var(--brand);
  border-radius: 0;
  padding: 6px 0 6px 18px;
  margin: 0 0 26px;
  line-height: 1.85;
}
.lead p { margin: 0; color: var(--ink-2); }


/* ---------- 正文配图 ---------- */
article figure.fig { margin: 26px 0 24px; }
article figure.fig picture { display: block; }
article figure.fig img {
  width: 100%;
  height: auto;
  display: block;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
}
article figure.fig figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--ink-3);
  line-height: 1.7;
}

/* ---------- 文末引流 ---------- */
.cta-box {
  margin-top: 42px;
  padding: 24px 26px;
  border-radius: 8px;
  background: var(--brand-soft);
  border: 0;
  border-left: 2px solid var(--brand);
}
.cta-box h3 { margin: 0 0 6px; font-size: 17px; color: var(--brand-deep); font-weight: 600; }
.cta-box p { margin: 0 0 14px; font-size: 14px; color: var(--ink-2); }
.cta-btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  transition: background-color .16s ease;
}
.cta-btn:hover { background: var(--brand-deep); text-decoration: none; }

/* ---------- 相关阅读 ---------- */
.related { margin-top: 38px; }
.related h2 {
  font-size: 12.5px;
  border: none;
  padding: 0;
  margin: 0 0 12px;
  color: var(--ink-3);
  letter-spacing: 0.14em;
  font-weight: 600;
}
.related ul { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.related li {
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: none;
  margin: 0;
  padding: 13px 0;
}
.related li a { font-weight: 600; }
.related li p { margin: 3px 0 0; font-size: 13.5px; color: var(--ink-3); }

/* ---------- 上下篇导航 ---------- */
.pager {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 34px;
  padding-top: 0;
  border-top: 1px solid var(--line);
}
.pager a {
  flex: 1 1 240px;
  min-width: 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: none;
  padding: 14px 16px 14px 0;
  display: block;
  transition: color .16s ease;
}
.pager a:hover { text-decoration: none; }
.pager a:hover .pager-title { color: var(--brand); }
.pager .pager-label {
  display: block;
  font-size: 11.5px;
  color: var(--ink-3);
  margin-bottom: 4px;
  letter-spacing: 0.12em;
}
.pager .pager-title {
  display: block;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.55;
  transition: color .16s ease;
}
.pager .pager-next { text-align: right; padding-right: 0; padding-left: 16px; border-left: 1px solid var(--line); }

/* ---------- 指南列表页 ---------- */
.guide-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.guide-list li {
  background: none;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 20px 0 18px;
  margin: 0;
}
.guide-list h2, .guide-list h3 { margin: 0 0 5px; font-size: 17.5px; border: none; padding: 0; font-weight: 600; }
.guide-list h2 a, .guide-list h3 a { color: var(--ink); transition: color .16s ease; }
.guide-list h2 a:hover, .guide-list h3 a:hover { color: var(--brand); text-decoration: none; }
.guide-list p { margin: 0; font-size: 14px; color: var(--ink-3); line-height: 1.75; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper);
  padding: 28px 20px;
  text-align: left;
  font-size: 12.5px;
  color: var(--ink-3);
  line-height: 2;
}
.site-footer a { color: var(--ink-3); transition: color .16s ease; }
.site-footer a:hover { color: var(--brand); }
.site-footer .sep { margin: 0 8px; color: var(--line); }

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  main { padding: 20px 14px 52px; }
  article { padding: 24px 18px 30px; border-radius: 10px; }
  article h1 { font-size: 23px; }
  article h2 { font-size: 19px; margin-top: 30px; padding-left: 11px; }
  article h3 { font-size: 16.5px; }
  .nav-right a:not(.nav-cta) { display: none; }
  article table { font-size: 13.5px; display: block; overflow-x: auto; }
  article th, article td { padding: 9px 10px 9px 0; }
  .lead { font-size: 15.5px; padding-left: 14px; }
  .cta-box { padding: 20px 18px; }
  .pager .pager-next { text-align: left; padding-left: 0; border-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}