/* 学海无涯 · 公共主题样式 */

@font-face { font-family: 'Lora'; src: url('../fonts/Lora-Regular.ttf') format('truetype'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Lora'; src: url('../fonts/Lora-Bold.ttf') format('truetype'); font-weight: 700; font-display: swap; }
@font-face { font-family: 'Lora'; src: url('../fonts/Lora-Italic.ttf') format('truetype'); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: 'Crimson'; src: url('../fonts/CrimsonPro-Regular.ttf') format('truetype'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Crimson'; src: url('../fonts/CrimsonPro-Bold.ttf') format('truetype'); font-weight: 700; font-display: swap; }
@font-face { font-family: 'JBMono'; src: url('../fonts/JetBrainsMono-Regular.ttf') format('truetype'); font-weight: 400; font-display: swap; }

:root {
  --bg: #faf7f2; --bg2: #f2ede4; --bg3: #ffffff;
  --ink: #2b2a26; --ink-soft: #4a4842; --muted: #8a8579;
  --rule: #e2dccf; --accent: #556b3d; --accent2: #a05a2c;
  --accent-soft: #eaece1;
  --font: 'Lora', 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --font-serif: 'Crimson', 'Noto Serif SC', 'Songti SC', serif;
  --font-mono: 'JBMono', 'Consolas', 'Courier New', monospace;
  --max: 780px; --radius: 6px;
  --shadow: 0 1px 2px rgba(43,42,38,.04), 0 8px 24px rgba(43,42,38,.06);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink); background: var(--bg);
  line-height: 1.8; -webkit-font-smoothing: antialiased;
}
::selection { background: var(--accent); color: var(--bg); }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent2); }
code {
  font-family: var(--font-mono);
  background: var(--bg2);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  font-size: 0.9em;
}
mark.key {
  background: linear-gradient(180deg, transparent 55%, rgba(160,90,44,0.22) 55%);
  color: var(--ink);
  padding: 0 2px;
}

.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* 页面顶部导航条 */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
}
.topbar a {
  color: var(--muted);
  transition: color .15s;
}
.topbar a:hover { color: var(--accent2); }
.topbar .breadcrumb { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
.topbar .breadcrumb .sep { color: var(--rule); }

/* 章节头 */
.chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.9rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1rem;
  margin-bottom: 2rem;
}
.chapter-head .num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  color: var(--accent2);
  text-transform: uppercase;
}
.chapter-head h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
  flex: 1 1 auto;
}
.chapter-head .cn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
  flex-basis: 100%;
}

/* 内容排版 */
h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--ink);
  letter-spacing: 0.04em;
  margin: 2rem 0 0.8rem;
}
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; color: var(--accent); }
h4 { font-size: 1.05rem; }
p { margin: 0.7rem 0; color: var(--ink-soft); }
p.lead {
  font-size: 1.1rem;
  color: var(--ink);
  padding: 1rem 1.2rem;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 3px;
  margin: 1.5rem 0 2rem;
}
strong { color: var(--ink); font-weight: 700; }

/* 生活场景 */
.scene {
  background: var(--bg3);
  border: 1px dashed var(--accent);
  border-radius: var(--radius);
  padding: 1.1rem 1.3rem;
  margin: 1.5rem 0;
}
.scene .scene-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}
.scene .scene-title {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--ink);
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}
.scene .link {
  margin-top: 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--rule);
  color: var(--accent2);
  font-size: 0.92rem;
}

/* 卡片 */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.9rem;
  margin: 1.3rem 0;
}
.card {
  background: var(--bg3);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
}
.card .card-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 0.3rem;
}
.card h4 { margin: 0.2rem 0 0.4rem; color: var(--ink); }
.card p { margin: 0.3rem 0; font-size: 0.94rem; }

/* 提示框 */
.callout {
  background: var(--bg2);
  border-left: 3px solid var(--muted);
  padding: 0.9rem 1.15rem;
  margin: 1.3rem 0;
  border-radius: 3px;
}
.callout.analogy {
  border-left-color: var(--accent2);
  background: linear-gradient(180deg, #f8f2e6 0%, #f2ede4 100%);
}
.callout .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}
.callout.analogy .tag { color: var(--accent2); }
.callout p { margin: 0.3rem 0; }

/* Key list */
ul.keylist { list-style: none; margin: 1rem 0; }
ul.keylist li {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0.75rem;
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--rule);
}
ul.keylist .k {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--ink);
}
ul.keylist .v { color: var(--ink-soft); font-size: 0.95rem; }

/* 表格 */
.table-wrap { overflow-x: auto; margin: 1.2rem 0; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}
th, td {
  padding: 0.55rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--rule);
}
th {
  background: var(--bg2);
  font-family: var(--font-serif);
  color: var(--ink);
  letter-spacing: 0.05em;
}
td { color: var(--ink-soft); }

/* Journey 步骤流 */
.journey { display: grid; gap: 0.7rem; margin: 1.2rem 0; }
.journey .step {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  background: var(--bg3);
  border-radius: var(--radius);
  padding: 0.8rem 1rem;
}
.journey .step h4 { margin: 0 0 0.3rem; font-size: 0.98rem; }
.journey .step p { margin: 0; font-size: 0.92rem; }

/* 底部翻页导航（默认显示在文章末尾） */
.pager {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  align-items: stretch;
}
.pager .btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0.85rem 1.1rem;
  background: var(--bg3);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.pager .btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}
.pager .btn .dir {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}
.pager .btn .title {
  font-family: var(--font-serif);
  color: var(--ink);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.04em;
}
.pager .btn.prev { text-align: left; }
.pager .btn.next { text-align: right; }
.pager .btn.disabled {
  opacity: 0.4;
  pointer-events: none;
}
.pager .home {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 1.1rem;
  background: var(--accent);
  color: var(--bg);
  border-radius: var(--radius);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: background .15s;
}
.pager .home:hover { background: var(--accent2); color: var(--bg); }

/* ====== 悬浮翻页岛（磨砂玻璃胶囊，居中悬浮） ====== */
.pager-float {
  position: fixed;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  padding: 6px;
  display: flex;
  gap: 6px;
  align-items: center;
  box-shadow:
    0 8px 32px rgba(43, 42, 38, 0.12),
    0 2px 8px rgba(43, 42, 38, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
  max-width: calc(100vw - 32px);
}
.pager-float .btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0.45rem 0.9rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  text-decoration: none;
  transition: all .18s;
  min-height: 44px;
  min-width: 0;
}
.pager-float .btn:hover {
  background: rgba(255, 255, 255, 0.5);
  border-color: rgba(85, 107, 61, 0.2);
  box-shadow: 0 2px 8px rgba(43, 42, 38, 0.08);
}
.pager-float .btn .dir {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 0.1rem;
}
.pager-float .btn .title {
  font-family: var(--font-serif);
  color: var(--ink);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}
.pager-float .btn.prev { text-align: left; }
.pager-float .btn.next { text-align: right; }
.pager-float .btn.disabled {
  opacity: 0.3;
  pointer-events: none;
}
.pager-float .home {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.85rem;
  min-height: 44px;
  background: rgba(85, 107, 61, 0.85);
  color: #fff;
  border-radius: 999px;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  transition: all .18s;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(85, 107, 61, 0.3);
}
.pager-float .home:hover {
  background: rgba(160, 90, 44, 0.9);
  color: #fff;
  box-shadow: 0 4px 12px rgba(160, 90, 44, 0.35);
}

/* 给页面底部留白，避免被悬浮岛遮住 */
body.has-float-pager { padding-bottom: 100px; }

@media (max-width: 720px) {
  .pager-float {
    bottom: 12px;
    padding: 4px;
    gap: 4px;
  }
  .pager-float .btn {
    padding: 0.35rem 0.6rem;
    min-height: 40px;
  }
  .pager-float .btn .title {
    font-size: 0.72rem;
    max-width: 90px;
  }
  .pager-float .btn .dir { font-size: 0.5rem; }
  .pager-float .home {
    padding: 0 0.65rem;
    min-height: 40px;
    font-size: 0.55rem;
  }
  body.has-float-pager { padding-bottom: 80px; }
}

/* Footer */
.page-foot {
  margin-top: 3rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.25em;
  color: var(--muted);
  text-transform: uppercase;
}

@media (max-width: 720px) {
  .pager { grid-template-columns: 1fr 1fr; }
  .pager .home { grid-column: span 2; padding: 0.65rem; }
  ul.keylist li { grid-template-columns: 1fr; gap: 0.15rem; }
  .cards { grid-template-columns: 1fr; }
}