*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#e8e4d0;
  --wrap-bg:#fcfbf7;
  --text:#222;
  --line:#e6e2da;
  --main:#8c3c24;
}
body.sepia{
  --bg:#e8e4d0;
  --wrap-bg:#f3efe0;
  --text:#3b3024;
  --line:#d8d0b8;
  --main:#914c2c;
}
body.dark{
  --bg:#1c1c1c;
  --wrap-bg:#2a2a2a;
  --text:#d9d9d9;
  --line:#383838;
  --main:#d48b6a;
}
body{
  font-family:"SimSun","Noto Serif SC",serif;
  background:var(--bg);
  color:var(--text);
  line-height:2.2;
  font-size:18px;
  transition: background .3s, color .3s;
}
.wrap{
  max-width:680px;
  margin:0 auto;
  padding:2rem 1.5rem;
  background:var(--wrap-bg);
  min-height:100vh;
}

/* 顶部栏 */
.top-bar{
  display:flex;justify-content:space-between;align-items:center;
  margin-bottom:2rem;padding-bottom:1rem;border-bottom:1px solid var(--line);
  gap:1rem;
}
.top-bar a{color:var(--main);text-decoration:none}
.tool-group{display:flex;gap:.6rem;align-items:center}
.tool-btn{
  border:1px solid var(--main);color:var(--main);background:transparent;
  padding:.3rem .7rem;border-radius:4px;cursor:pointer;
  font-family:inherit;font-size:13px;
}
.tool-btn:hover{background:var(--main);color:var(--bg)}

/* 正文 */
.article{
  white-space:pre-wrap;
  text-indent:2em;
  min-height:400px;
  padding:0 .2rem;
  word-break:break-word;
}
.article .chapter-inner-title{
  text-indent:0;
  text-align:center;
  font-size:1.2em;
  font-weight:700;
  margin-bottom:1.5em;
  padding-bottom:.6em;
  border-bottom:1px solid var(--line);
}
.loading{color:#888;text-align:center;padding:4rem 0;font-size:16px}

/* 上下章 */
.nav{
  margin-top:3rem;display:flex;justify-content:space-between;gap:1rem;
}
.nav a{
  display:block;padding:.7rem 1.4rem;border:1px solid var(--main);
  color:var(--main);text-decoration:none;border-radius:4px;
  font-size:15px;transition:all .2s;
}
.nav a:hover{background:var(--main);color:var(--bg)}
.nav a.disabled{opacity:.3;pointer-events:none}

/* 阅读记录 */
.record-box{
  text-align:center;margin-bottom:1.2rem;
}
.record-box a{color:var(--main);font-size:14px}

/* 页脚 */
footer{
  margin-top:6rem;text-align:center;font-size:.85rem;color:#777;
  padding-bottom:2rem;
}
footer a{color:#777;text-decoration:none;margin:0 .5rem}

/* 字号面板 */
.font-panel{
  position:fixed;right:16px;top:80px;border:1px solid var(--line);
  background:var(--bg);padding:1rem;border-radius:6px;display:none;
  box-shadow:0 4px 20px rgba(0,0,0,.08);z-index:99;
}
.font-panel p{margin-bottom:.6rem;font-size:13px;text-align:center;opacity:.7}
.font-option{
  display:block;width:100%;border:none;background:transparent;
  padding:.4rem 1rem;margin:.2rem 0;color:var(--text);cursor:pointer;
  font-family:inherit;font-size:14px;border-radius:4px;
}
.font-option:hover{background:var(--line)}

/* ============ 目录抽屉 ============ */
.reader-catalog{
  position:fixed;
  top:0;left:0;bottom:0;
  width:80%;
  max-width:340px;
  background:#fff;
  z-index:200;
  transform:translateX(-100%);
  transition:transform .3s;
  display:flex;
  flex-direction:column;
  box-shadow:2px 0 12px rgba(0,0,0,.1);
}
body.dark .reader-catalog{background:#2a2a2a;color:#ccc}
body.sepia .reader-catalog{background:#f8f4e8}
.reader-catalog.open{transform:translateX(0)}

.reader-catalog-header{
  display:flex;justify-content:space-between;align-items:center;
  padding:16px;
  border-bottom:1px solid var(--line);
  font-size:15px;font-weight:600;
}
.reader-catalog-header button{
  font-size:22px;color:#888;padding:0 8px;
  background:none;border:none;cursor:pointer;
  line-height:1;
}

.reader-catalog-list{
  flex:1;
  overflow-y:auto;
  list-style:none;
  padding:8px 0;
  margin:0;
}
.reader-catalog-list li a{
  display:block;
  padding:12px 20px;
  font-size:14px;
  color:inherit;
  text-decoration:none;
  border-bottom:1px solid rgba(0,0,0,.04);
  transition:background .2s;
}
.reader-catalog-list li a:hover{background:rgba(0,0,0,.04)}
.reader-catalog-list li a.active{
  color:var(--main);
  font-weight:600;
}

/* 遮罩 */
.reader-mask{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,.4);
  z-index:180;
  opacity:0;
  pointer-events:none;
  transition:opacity .25s;
}
.reader-mask.show{
  opacity:1;
  pointer-events:auto;
}

/* 手机适配 */
@media (max-width:768px){
  body{font-size:17px;line-height:2}
  .wrap{padding:1.2rem 1rem}
  .top-bar{flex-wrap:wrap;gap:.5rem}
  .nav a{padding:.6rem 1rem;font-size:14px}
  .reader-catalog{width:85%}
}