/* ===== 公选课情报站 · hugo-book 风格 ===== */

:root {
  --body-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono-font: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --bg: #fff;
  --fg: #333;
  --fg-muted: #777;
  --border: #eee;
  --link: #00b8d4;
  --link-dark: #0097a7;
  --mark: #ff0;
  --hint-border: #00b8d4;
  --good: #2e7d32;
  --bad: #c62828;
  --warn: #e65100;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--body-font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
}

img { max-width: 100%; }

.hidden { display: none !important; }
.flex { display: flex; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; color: var(--link-dark); }

.container { max-width: 1400px; margin: 0 auto; }

/* ===== 左侧菜单 ===== */

.book-menu {
  flex: 0 0 300px;
  font-size: 15px;
}

.book-menu-content {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 16px 0 24px;
  border-right: 1px solid var(--border);
}

.book-search {
  margin: 0 16px 12px;
}

.book-search input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 15px;
  font-family: var(--body-font);
  outline: none;
}
.book-search input:focus { border-color: var(--link); }

.menu-contribute {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 4px 16px 10px;
  font-size: 14px;
}
.menu-contribute a { font-weight: 500; }
.menu-contribute span { color: var(--fg-muted); }

.same-province-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.same-province-title {
  margin: 4px 16px 8px;
  font-size: 15px;
  font-weight: 600;
}

.same-province-menu li a {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 16px;
  color: var(--fg);
  border-left: 3px solid transparent;
  word-break: break-word;
}
.same-province-menu li a:hover { background: #fafafa; text-decoration: none; color: var(--link-dark); }
.same-province-menu li a.active {
  background: #f0f8fa;
  border-left-color: var(--link);
  color: var(--link-dark);
}

/* ===== 中间内容 ===== */

.book-page {
  flex: 1;
  min-width: 0;
  padding: 0 16px;
}

.book-header { margin: 16px 0 8px; }
.book-header label { cursor: pointer; color: var(--link); font-size: 15px; }
.book-icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  border-radius: 4px;
  font-size: 14px;
  user-select: none;
}
.book-icon-btn:hover { background: #f0f8fa; }
.book-icon-btn svg { display: block; }
.book-header h3 { margin: 0; font-size: 16px; font-weight: 600; }
.book-header aside { border: 1px solid var(--border); border-radius: 4px; margin-top: 8px; padding: 8px; font-size: 14px; }
.book-header aside ul { list-style: none; margin: 0; padding: 0; }
.book-header aside li { padding: 3px 0; }

.markdown.book-article {
  max-width: 780px;
  margin: 0 auto;
  padding: 24px 8px 40px;
}

.markdown h1 {
  font-size: 2em;
  margin: 0 0 16px;
  line-height: 1.25;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.markdown h2 {
  font-size: 1.5em;
  margin: 1.5em 0 0.5em;
  line-height: 1.3;
  scroll-margin-top: 16px;
}

.markdown h2 .anchor {
  font-size: 0.75em;
  color: #ccc;
  margin-left: 6px;
  font-weight: 400;
  opacity: 0;
  transition: opacity 0.15s;
}
.markdown h2:hover .anchor { opacity: 1; }
.markdown h2 .anchor:hover { color: var(--link); text-decoration: none; }

.markdown blockquote { margin: 1em 0; }
.markdown blockquote.book-hint {
  border-left: 4px solid var(--hint-border);
  padding: 0.5em 1em;
  background: #f7fbfc;
  color: var(--fg);
  font-size: 0.95em;
  margin-left: 0;
  margin-right: 0;
}
.markdown blockquote.book-hint p { margin: 0.25em 0; }

.markdown details {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.5em 1em;
  margin: 1em 0;
  font-size: 0.95em;
  background: #fcfcfc;
}
.markdown details summary { cursor: pointer; user-select: none; }
.markdown-inner { margin-top: 0.5em; }
.markdown-inner ul { margin: 0.25em 0; padding-left: 1.5em; }

/* ===== 首页 / 课程页 ===== */

.back-to-home { margin: 0 0 12px; font-size: 0.92em; }

.course-meta {
  font-size: 0.92em;
  color: var(--fg-muted);
  margin-bottom: 1em;
}

#qa-blocks h3 {
  font-size: 1.15em;
  margin: 1.6em 0 0.4em;
  scroll-margin-top: 20px;
  line-height: 1.4;
  padding-bottom: 0.25em;
  border-bottom: 1px solid #f0f0f0;
}
#qa-blocks h3 .anchor {
  font-size: 0.8em;
  color: #ccc;
  margin-right: 6px;
  font-weight: 400;
  opacity: 0;
  transition: opacity 0.15s;
}
#qa-blocks h3:hover .anchor { opacity: 1; }
#qa-blocks h3 .anchor:hover { color: var(--link); text-decoration: none; }

.qa-answer {
  margin: 0 0 1.2em;
  font-size: 0.98em;
  white-space: pre-wrap;
  word-break: break-word;
}
.qa-answer.easy { color: var(--good); }
.qa-answer.hard { color: var(--bad); }
.qa-answer.none { color: var(--fg-muted); font-style: italic; }

/* ===== 首页课程卡片 ===== */

.campus-group { margin-top: 1.5em; }
.campus-title { display: flex; align-items: baseline; gap: 8px; }
.campus-count { font-size: 0.6em; font-weight: 400; color: var(--fg-muted); }

.course-cards {
  list-style: none;
  margin: 0.5em 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}
.course-card a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  color: var(--fg);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.course-card a:hover {
  border-color: var(--link);
  box-shadow: 0 2px 8px rgba(0, 184, 212, 0.15);
  text-decoration: none;
}
.cc-name { font-weight: 600; }
.cc-meta { font-size: 0.85em; color: var(--fg-muted); }

.empty-tip { text-align: center; color: var(--fg-muted); padding: 2em 0; }

/* ===== 右侧目录 ===== */

.book-toc {
  flex: 0 0 240px;
  font-size: 14px;
}

.book-toc-content {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 16px 8px 24px 16px;
  border-left: 1px solid var(--border);
}

.book-toc nav ul { list-style: none; margin: 0; padding: 0; }
.book-toc nav li { margin: 2px 0; }
.book-toc nav li a {
  display: block;
  padding: 3px 8px;
  color: var(--fg-muted);
  border-left: 2px solid transparent;
  word-break: break-word;
}
.book-toc nav li a:hover { color: var(--link-dark); text-decoration: none; background: #fafafa; }
.book-toc nav li a.active { color: var(--link-dark); border-left-color: var(--link); }

.book-toc.toc-empty { display: none; }

/* ===== 页脚 ===== */

.book-footer { padding: 8px 16px 24px; }
.book-footer .book-copyright {
  font-size: 13px;
  color: var(--fg-muted);
}
.book-footer a { color: var(--fg-muted); }

/* ===== 移动端 ===== */

@media (max-width: 960px) {

  body { font-size: 15px; }

  .book-menu,
  .book-toc {
    display: block;
    position: fixed;
    top: 0;
    bottom: 0;
    z-index: 60;
    background: #fff;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.15);
    transition: transform 0.2s ease;
    flex: none;
  }
  .book-menu { left: 0; width: 300px; transform: translateX(-100%); border-right: none; }
  .book-toc { display: none; }

  .book-menu-content, .book-toc-content {
    height: 100%;
    border: none;
  }

  #menu-control:checked ~ .container .book-menu { transform: translateX(0); }
  #toc-control:checked ~ .container .book-header aside { display: block !important; }

  .book-menu-overlay, .book-toc-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 50;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.2s;
  }
  #menu-control:checked ~ .book-menu-overlay { visibility: visible; opacity: 1; }
  #toc-control:checked ~ .book-toc-overlay { visibility: visible; opacity: 1; }

  .book-header.hidden { display: flex !important; }
  .book-page { padding: 0 12px; }
  .markdown.book-article { padding: 12px 4px 32px; }
  .markdown h1 { font-size: 1.6em; }
  .markdown h2 { font-size: 1.3em; }
}