:root{
  --paper:#f6f3ec; --card:#ffffff; --ink:#2b2723; --muted:#8e8578;
  --accent:#bf4630; --accent-soft:#fbe9e3; --line:#e9e3d7; --shadow:0 6px 18px rgba(70,55,40,.10);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%;margin:0}
body{
  background:var(--paper); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Noto Sans CJK SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  overflow:hidden;               /* 页面本身不滚，滚动交给内部容器 */
  -webkit-user-select:none; user-select:none;
}
#app{display:flex;height:100%;width:100%}

/* ---------- 侧栏 ---------- */
#sidebar{
  width:306px;flex:0 0 306px;display:flex;flex-direction:column;min-height:0;
  border-right:1px solid var(--line);background:#faf8f3;
}
.book-chip{
  display:flex;align-items:center;gap:9px;margin:12px 12px 6px;padding:8px 10px;
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  color:var(--ink);font-size:14px;font-weight:600;cursor:pointer;text-align:left;
  box-shadow:0 2px 6px rgba(70,55,40,.05);
}
.book-chip img{width:26px;height:34px;object-fit:cover;border-radius:4px;background:#ddd}
.book-chip span{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lesson-head{
  padding:6px 18px 8px;font-size:12px;letter-spacing:.08em;color:var(--muted);font-weight:600;
}
.lesson-note{
  display:none;margin:0 14px 8px;padding:7px 10px;border-radius:8px;
  background:#f3eee2;border:1px solid #e6dfd0;color:#8d8272;font-size:11px;line-height:1.5;
}
.lesson-list{flex:1 1 auto;min-height:0;overflow-y:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch;padding:0 8px 16px}
.lesson-item{
  display:flex;gap:10px;align-items:center;padding:10px 12px;border-radius:10px;cursor:pointer;
}
.lesson-item:active{background:#f0ece3}
.lesson-item.active{background:var(--accent-soft)}
.lesson-item .no{
  flex:0 0 70px;width:70px;font-size:11px;color:var(--muted);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  font-variant-numeric:tabular-nums;
}
.lesson-item.active .no{color:var(--accent)}
.lesson-item .nm{flex:1 1 auto;min-width:0;font-size:14px;line-height:1.35;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lesson-item .du{margin-left:auto;font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums;flex:0 0 auto}

/* ---------- 主区 ---------- */
#main{flex:1 1 auto;display:flex;flex-direction:column;min-width:0;min-height:0}
.drawer-btn{
  display:none;flex:0 0 auto;width:38px;height:38px;border-radius:10px;
  border:1px solid var(--line);background:var(--card);color:#5a5348;
  align-items:center;justify-content:center;cursor:pointer;
}
.scrim{
  display:none;position:fixed;inset:0;background:rgba(40,34,28,.38);
  opacity:0;pointer-events:none;transition:opacity .22s ease;z-index:55;
}
#topbar{
  display:flex;align-items:center;gap:16px;padding:14px 22px 10px;border-bottom:1px solid var(--line);
  background:rgba(246,243,236,.92);
}
.ttl{min-width:0}
.ttl .lbl{font-size:12px;color:var(--accent);font-weight:700;letter-spacing:.04em}
.ttl .name{font-size:20px;font-weight:700;margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.modes{margin-left:auto;display:flex;gap:6px;flex:0 0 auto}
.pill{
  border:1px solid var(--line);background:var(--card);color:var(--muted);
  padding:7px 13px;border-radius:999px;font-size:13px;cursor:pointer;
}
.pill.on{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}

/* ---------- 文章区（可滚动） ---------- */
.lines{
  flex:1 1 auto;min-height:0;              /* 关键：允许收缩 */
  position:relative;                       /* offsetTop 基准 */
  overflow-y:auto;overflow-x:hidden;
  -webkit-overflow-scrolling:touch;overscroll-behavior:contain;
  touch-action:pan-y;
  padding:10px 12px 26px;scroll-behavior:smooth;
}
.line{
  display:flex;align-items:flex-start;gap:12px;
  padding:12px 16px;margin:4px 6px;border-radius:12px;cursor:pointer;
  border-left:3px solid transparent;transition:background .18s ease;
}
.line .txt{flex:1;min-width:0}
.line .en{font-size:19px;line-height:1.5;color:#332e29;word-break:break-word}
.line .zh{font-size:14px;line-height:1.5;color:var(--muted);margin-top:5px;word-break:break-word}
.line .lnum{font-size:11px;color:#c3bbae;padding-top:6px;font-variant-numeric:tabular-nums;min-width:20px;text-align:right}
.line.active{background:var(--card);border-left-color:var(--accent);box-shadow:var(--shadow)}
.line.active .en{color:var(--accent);font-weight:600}
.line.active .lnum{color:var(--accent)}
.line.active .zh{color:#a8563f}

/* 显示模式 */
#lines.mode-en .zh{display:none}
#lines.mode-zh .en{display:none}
#lines.mode-zh .zh{font-size:19px;color:#332e29;margin-top:0}
#lines.mode-blur .line .en,
#lines.mode-blur .line .zh{
  filter:blur(4px);opacity:.62;
  transition:filter .2s ease,opacity .2s ease;
}
#lines.mode-blur .line.peek .en,
#lines.mode-blur .line.peek .zh{filter:none;opacity:1}
@media (hover:hover){
  #lines.mode-blur .line:hover .en,
  #lines.mode-blur .line:hover .zh{filter:none;opacity:1}
}

/* ---------- 底部控制 ---------- */
#bar{flex:0 0 auto;border-top:1px solid var(--line);background:#faf8f3;padding:10px 22px 14px}
.seekrow{display:flex;align-items:center;gap:12px}
.seekrow span{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums;min-width:38px;text-align:center}
.seek{position:relative;flex:1;height:22px;display:flex;align-items:center;cursor:pointer}
.seek::before{content:"";position:absolute;left:0;right:0;height:4px;border-radius:2px;background:#e5dfd2}
.seek-fill{position:absolute;left:0;height:4px;border-radius:2px;background:var(--accent);width:0}
.seek-dot{position:absolute;width:12px;height:12px;border-radius:50%;background:var(--accent);left:0;transform:translateX(-50%);box-shadow:0 1px 4px rgba(0,0,0,.2)}
.ctrlrow{display:flex;align-items:center;gap:8px;margin-top:6px;flex-wrap:wrap}
.cbtn{
  width:46px;height:46px;border-radius:50%;border:1px solid var(--line);background:var(--card);
  color:#5a5348;font-size:15px;cursor:pointer;display:flex;align-items:center;justify-content:center;
}
.cbtn:active{background:#f0ece3}
.cbtn.play{width:58px;height:58px;background:var(--accent);border-color:var(--accent);color:#fff;font-size:20px}
.tgroup{display:flex;align-items:center;gap:8px;margin-left:auto}
.tbtn{
  padding:9px 15px;border-radius:999px;border:1px solid var(--line);
  background:var(--card);color:#5a5348;font-size:13px;cursor:pointer;
}
.tbtn.on{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
#btnLoopTimes{padding:9px 12px}

/* ---------- 书架 ---------- */
.shelf{
  position:fixed;inset:0;background:linear-gradient(180deg,#f8f5ee,#efe9dd);
  display:none;align-items:center;justify-content:center;z-index:70;overflow-y:auto;
}
.shelf.show{display:flex}
.shelf-inner{width:100%;max-width:1060px;padding:34px 28px;text-align:center}
.shelf h1{font-size:30px;margin:0 0 4px}
.shelf-sub{color:var(--muted);margin:0 0 26px;font-size:13px;letter-spacing:.06em}
.shelf-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.book{background:transparent;border:none;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:10px}
.book img{width:100%;aspect-ratio:3/4;object-fit:cover;border-radius:10px;box-shadow:0 10px 24px rgba(70,55,40,.18);background:#ddd}
.book .bn{font-size:15px;font-weight:700;color:var(--ink)}
.book .bc{font-size:12px;color:var(--muted)}
.shelf-close{
  margin-top:26px;padding:10px 22px;border-radius:999px;border:1px solid var(--line);
  background:var(--card);color:#5a5348;font-size:13px;cursor:pointer;
}
.shelf-actions{
  margin-top:26px;display:flex;align-items:center;justify-content:center;
  gap:10px;flex-wrap:wrap;
}
.shelf-actions .shelf-close{margin-top:0}
.shelf-info{
  padding:10px 18px;border-radius:999px;border:1px dashed #c9bfa9;
  background:transparent;color:var(--muted);font-size:13px;cursor:pointer;
  transition:color .18s ease,border-color .18s ease;
}
.shelf-info:active{color:var(--accent);border-color:var(--accent)}

/* ---------- 词书详情弹窗 ---------- */
.info-mask{
  position:fixed;inset:0;background:rgba(40,34,28,.45);
  display:none;align-items:center;justify-content:center;z-index:90;
  padding:20px;overflow-y:auto;-webkit-overflow-scrolling:touch;
}
.info-mask.show{display:flex}
.info-card{
  position:relative;width:100%;max-width:430px;background:var(--card);
  border-radius:16px;box-shadow:0 18px 48px rgba(60,48,36,.28);
  padding:24px 24px 20px;animation:infoPop .22s ease;
}
@keyframes infoPop{from{transform:scale(.94);opacity:0}to{transform:scale(1);opacity:1}}
.info-x{
  position:absolute;top:10px;right:10px;width:32px;height:32px;border:none;border-radius:50%;
  background:#f3eee2;color:#8e8578;font-size:14px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
}
.info-x:active{background:#e9e3d7}
.info-head{display:flex;gap:14px;align-items:center;padding-right:36px}
.info-cover{
  width:64px;height:86px;object-fit:cover;border-radius:8px;background:#ddd;flex:0 0 auto;
  box-shadow:0 4px 12px rgba(70,55,40,.18);
}
.info-title{min-width:0}
.info-title .n{font-size:18px;font-weight:700;line-height:1.3}
.info-title .e{font-size:12px;color:var(--accent);font-weight:600;margin-top:3px}
.info-title .s{font-size:12px;color:var(--muted);margin-top:2px}
.info-rows{margin-top:16px;border-top:1px solid var(--line)}
.info-row{
  display:flex;gap:14px;padding:10px 2px;border-bottom:1px solid var(--line);
  font-size:13px;line-height:1.55;align-items:flex-start;
}
.info-row .k{flex:0 0 62px;color:var(--muted);font-size:12px;padding-top:1px}
.info-row .v{flex:1 1 auto;min-width:0;color:#4a443c}
.info-feedback{
  margin-top:16px;padding:13px 14px;border-radius:12px;
  background:var(--accent-soft);border:1px solid #f2d9cf;
}
.info-feedback .fb-t{font-size:13px;font-weight:700;color:var(--accent)}
.info-feedback .fb-d{font-size:12px;color:#8a5a48;line-height:1.6;margin-top:5px}
.info-feedback .fb-mail{
  display:inline-block;margin-top:9px;font-size:13px;font-weight:600;
  color:var(--accent);text-decoration:none;border-bottom:1px solid rgba(191,70,48,.4);
  word-break:break-all;
}

/* ---------- 提示 ---------- */
.tip{
  position:fixed;left:50%;bottom:96px;transform:translateX(-50%) translateY(10px);
  background:rgba(43,39,35,.9);color:#fff;font-size:13px;padding:9px 16px;border-radius:999px;
  opacity:0;pointer-events:none;transition:all .22s ease;z-index:80;
}
.tip.show{opacity:1;transform:translateX(-50%) translateY(0)}

@media (max-width:820px){
  #sidebar{width:250px;flex-basis:250px}
  .line .en{font-size:17px}
  .shelf-grid{grid-template-columns:repeat(2,1fr)}
}

/* ---------- 手机（竖屏）适配 ---------- */
@media (max-width:640px){
  /* 侧栏改为抽屉，正文占满全宽 */
  #sidebar{
    position:fixed;left:0;top:0;bottom:0;width:min(84vw,330px);
    flex:0 0 auto;z-index:60;transform:translateX(-100%);
    transition:transform .26s cubic-bezier(.2,.8,.3,1);
    box-shadow:0 0 28px rgba(60,48,36,.18);
  }
  body.drawer-open #sidebar{transform:translateX(0)}
  .scrim{display:block}
  body.drawer-open .scrim{opacity:1;pointer-events:auto}

  #topbar{
    flex-wrap:wrap;gap:8px;padding:10px 12px 8px;
    padding-top:10px;
  }
  .drawer-btn{display:flex}
  .ttl{flex:1 1 auto;min-width:0}
  .ttl .lbl{font-size:11px}
  .ttl .name{font-size:17px}
  .modes{
    width:100%;margin-left:0;gap:6px;
    overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:2px;
  }
  .pill{padding:6px 12px;font-size:12.5px;flex:0 0 auto}

  .lines{padding:6px 6px 20px}
  .line{padding:10px;margin:3px 2px;gap:8px;border-radius:10px}
  .line .en{font-size:16.5px;line-height:1.45}
  .line .zh{font-size:12.5px;margin-top:4px}
  .line .lnum{font-size:10px;min-width:16px;padding-top:5px}

  #bar{padding:8px 12px 10px}
  .seekrow{gap:8px}
  .seekrow span{min-width:32px;font-size:10.5px}
  .ctrlrow{gap:6px;justify-content:center}
  .cbtn{width:40px;height:40px;font-size:13px}
  .cbtn.play{width:52px;height:52px;font-size:19px}
  .tgroup{flex:1 1 100%;justify-content:center;margin-left:0;margin-top:2px;gap:8px}
  .tbtn{padding:7px 14px;font-size:12px}

  .shelf-inner{padding:26px 18px}
  .shelf h1{font-size:23px}
  .shelf-sub{margin-bottom:18px}
  .shelf-grid{gap:14px}
  .book .bn{font-size:13.5px}
  .tip{top:56px;bottom:auto;font-size:12px;max-width:86vw;text-align:center}
}