/* ============================================
   学术论文样式 · Academic Paper Template
   可折叠侧边栏 + 内容始终居中 + 多端适配
   v3.0 · 2026-06
   ============================================ */

:root {
  --pri: #1a5276; --acc: #c0392b;
  --bg: #fdfdfd; --txt: #2c3e50; --tx2: #7f8c8d; --bd: #ddd;
  --rd: 8px; --max-w: 800px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Serif SC", Georgia, serif;
  background: var(--bg); color: var(--txt); line-height: 2;
  -webkit-font-smoothing: antialiased;
}

/* ===== 侧边栏：默认隐藏，点击浮动覆盖 ===== */
.sidebar {
  position: fixed; top: 0; left: 0;
  width: 280px; height: 100vh;
  background: #f3f3f3; border-right: 1px solid var(--bd);
  overflow-y: auto; z-index: 100;
  padding: 30px 20px; font-size: 0.88em;
  transform: translateX(-100%);
  transition: transform 0.22s ease;
  box-shadow: 2px 0 16px rgba(0,0,0,0.1);
}
.sidebar.open { transform: translateX(0); }
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: #ccc; border-radius: 2px; }
.sidebar h2 {
  font-size: 0.95em; color: var(--txt); margin-bottom: 4px; font-weight: 700;
}
.sidebar .repo-link {
  font-size: 0.78em; color: var(--pri); text-decoration: none;
  display: block; margin-bottom: 18px; word-break: break-all;
}
.sidebar .repo-link:hover { text-decoration: underline; }
.toc-header {
  font-weight: 700; font-size: 0.75em; text-transform: uppercase;
  letter-spacing: 1px; color: var(--tx2); margin: 16px 0 8px;
}
.toc-nav a {
  display: block; padding: 5px 10px; color: var(--tx2); text-decoration: none;
  border-left: 3px solid transparent; font-size: 0.83em;
  transition: all 0.15s; margin: 1px 0; border-radius: 0 4px 4px 0;
}
.toc-nav a:hover, .toc-nav a.active {
  color: var(--pri); border-left-color: var(--pri); background: rgba(26,82,118,0.08);
}

/* 关闭浮动层 */
.overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.25);
  z-index: 99; display: none;
  transition: opacity 0.22s;
}
.overlay.show { display: block; }

/* ===== 主内容区：始终居中 ===== */
.main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 50px 40px 80px;
}
.main h1:first-of-type {
  font-size: 1.65em; line-height: 1.5; text-align: center;
  margin-bottom: 8px; padding-bottom: 14px;
  border-bottom: 2px solid var(--pri); color: var(--txt);
}
.main h2 {
  font-size: 1.15em; margin: 42px 0 16px; padding-bottom: 8px;
  border-bottom: 1px solid var(--bd); color: var(--txt); scroll-margin-top: 20px;
}
.main h3 { font-size: 1em; margin: 26px 0 8px; color: var(--pri); }
.main h4 { font-size: 0.94em; margin: 16px 0 4px; color: var(--acc); }

/* 正文 */
.main p, .main li {
  font-size: 0.94em; text-align: justify; margin: 8px 0; line-height: 2;
}
.main li { margin: 5px 0; }
.main ul, .main ol { padding-left: 22px; margin: 8px 0; }

/* 引用 */
.main blockquote {
  background: #f9f9f9; border-left: 4px solid #ccc;
  padding: 12px 18px; margin: 16px 0; font-size: 0.88em; color: #555; line-height: 1.9;
}

/* 摘要 */
.main .abstract {
  background: #f5f5f5; padding: 22px 26px; border-radius: var(--rd);
  margin: 18px 0 30px; font-size: 0.9em; line-height: 2;
}
.main .abstract h4 { margin: 0 0 8px; color: var(--acc); font-size: 1em; }

/* 高亮 */
.main .innovation {
  background: #fff8e1; border: 1px solid #f0c040;
  padding: 14px 18px; border-radius: var(--rd); margin: 16px 0;
  font-size: 0.88em; line-height: 1.9;
}
.main .model-box {
  background: #eaf2f8; border: 1px dashed var(--pri);
  padding: 16px 20px; border-radius: var(--rd); margin: 16px 0;
}

/* 表格 */
.main table.dt {
  width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 0.86em;
}
.main .dt th {
  background: var(--pri); color: #fff; border: 1px solid #1a4a66;
  padding: 8px 12px; text-align: left; font-weight: 600;
}
.main .dt td { padding: 8px 12px; border: 1px solid var(--bd); line-height: 1.8; }
.main .dt tr:nth-child(even) td { background: #fafbfc; }

/* 关键词 */
.main .keywords { display: flex; flex-wrap: wrap; gap: 5px; margin: 10px 0 18px; }
.main .kw {
  background: #eaf2f8; color: var(--pri); padding: 2px 12px;
  border-radius: 10px; font-size: 0.78em;
}

/* ===== 元数据区 ===== */
.main .paper-meta {
  text-align: center;
  padding: 0 0 20px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--bd);
}
.main .paper-authors {
  font-size: 1.1em; font-weight: 600; color: var(--txt); margin-bottom: 6px;
}
.main .paper-info {
  display: flex; justify-content: center; gap: 16px; flex-wrap: wrap;
  font-size: 0.82em; color: var(--tx2); margin-bottom: 8px;
}
.main .paper-info span { white-space: nowrap; }
.main .paper-links {
  display: flex; justify-content: center; gap: 12px; margin-top: 6px;
}
.main .paper-links a {
  font-size: 0.84em; color: var(--pri); text-decoration: none;
  border: 1px solid var(--pri); padding: 4px 14px; border-radius: 16px;
  transition: all 0.15s;
}
.main .paper-links a:hover { background: var(--pri); color: #fff; }
.main .end-note { text-align: center; color: var(--tx2); font-size: 0.88em; padding: 40px 20px; }
.main .divider { text-align: center; padding: 40px 0; color: var(--tx2); font-size: 1.2em; }

/* ===== 目录按钮 ===== */
.toc-btn {
  position: fixed; top: 16px; left: 16px; z-index: 98;
  background: var(--pri); color: #fff; border: none;
  padding: 10px 16px; border-radius: 8px; cursor: pointer;
  font-size: 0.9em; box-shadow: 0 2px 8px rgba(0,0,0,0.12);
  transition: background 0.15s;
}
.toc-btn:hover { background: #14456b; }

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .main { padding: 24px 16px 40px; }
  .main h1:first-of-type { font-size: 1.25em; }
  .main h2 { font-size: 1.05em; }
  .main p, .main li { font-size: 0.9em; }
  .sidebar { width: 100%; }
  .toc-btn { top: 10px; left: 10px; padding: 8px 14px; font-size: 0.82em; }
}