/* ============ 英语教材书架 ============ */
/* 主题变量:浅色为默认,深色由 [data-theme="dark"] 覆盖 */
:root{
  --bg1:#eef2ff; --bg2:#fdf4ff; --bg3:#f5f7fb;
  --card:#ffffff;
  --ink:#2b3a55;
  --muted:#8a94a6;
  --line:#f0f2f8;
  --hover:#f6f8ff;
  --brand:#4f7cff;
  --brand2:#8b5cf6;
  --brand-soft:#eef3ff;
  --radius:18px;
  --shadow:0 8px 24px rgba(43,58,85,.10);
  --shadow-lg:0 16px 34px rgba(43,58,85,.16);
  --hero-a:#c7d2fe; --hero-b:#ddd6fe;
  --btn-a:#f1f4fb; --btn-b:#e2e8f6;
  --btn-a-h:#e9edfb; --btn-b-h:#d9e1f4;
  --dock-bg:rgba(255,255,255,.92);
  --dock-shadow:0 -8px 32px rgba(43,58,85,.14);
  --sheet-shadow:0 -10px 34px rgba(43,58,85,.18);
  --dock-h:64px;                 /* 由 JS 实测后覆盖 */
  /* 字号档位:data-font 切换,正文全部走这几个变量 */
  --f-17:17px; --f-15:15px; --f-14:14px; --f-13:13px; --f-12:12px; --f-11:11px;
}
[data-theme="dark"]{
  --bg1:#141a26; --bg2:#1b1726; --bg3:#0f131b;
  --card:#1b2230;
  --ink:#e6ebf5;
  --muted:#8b96ab;
  --line:#252d3d;
  --hover:#212a3a;
  --brand:#6b93ff;
  --brand2:#a78bfa;
  --brand-soft:#232e45;
  --shadow:0 8px 24px rgba(0,0,0,.45);
  --shadow-lg:0 16px 34px rgba(0,0,0,.55);
  --hero-a:#2b3550; --hero-b:#3a2f55;
  --btn-a:#242d3d; --btn-b:#1b2230;
  --btn-a-h:#2b3548; --btn-b-h:#202836;
  --dock-bg:rgba(24,30,42,.94);
  --dock-shadow:0 -8px 32px rgba(0,0,0,.5);
  --sheet-shadow:0 -10px 34px rgba(0,0,0,.55);
}
[data-font="s"]{ --f-17:15px; --f-15:14px; --f-14:13px; --f-13:12px; --f-12:11px; --f-11:10px; }
[data-font="l"]{ --f-17:19px; --f-15:17px; --f-14:16px; --f-13:15px; --f-12:14px; --f-11:13px; }

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  background:linear-gradient(160deg,var(--bg1) 0%,var(--bg2) 55%,var(--bg3) 100%);
  background-attachment:fixed;
  color:var(--ink);
  min-height:100%;
  -webkit-text-size-adjust:100%;
}
.hidden{display:none !important}
.view{
  max-width:1080px;margin:0 auto;
  padding:18px 20px calc(var(--dock-h) + 26px + env(safe-area-inset-bottom));
}
button{font-family:inherit}

/* ---------- 书架 ---------- */
.hero{text-align:center;padding:34px 0 8px}
.hero h1{
  font-size:calc(var(--f-17) * 2);
  letter-spacing:1px;
  background:linear-gradient(90deg,var(--brand),var(--brand2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero .sub{color:var(--muted);margin-top:8px;font-size:var(--f-15)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:22px;padding:28px 4px}
.book-card{
  background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);
  overflow:hidden;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease;
  border:1px solid rgba(79,124,255,.08);
  text-align:left;display:flex;flex-direction:column;
}
.book-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.book-card:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
.book-cover{
  position:relative;aspect-ratio:3/4;
  background:linear-gradient(135deg,var(--hero-a),var(--hero-b));
  display:flex;align-items:center;justify-content:center;
  font-size:58px;font-weight:700;color:#fff;user-select:none;overflow:hidden;
}
.book-cover .cover-letter{position:relative;z-index:1}
.book-cover img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  display:block;z-index:2;opacity:0;transition:opacity .25s ease;
}
.book-cover.loaded img{opacity:1}
/* 已听进度角标 / 继续播放 */
.cover-badge{
  position:absolute;left:8px;bottom:8px;z-index:3;
  background:rgba(15,20,32,.66);color:#fff;
  font-size:var(--f-11);font-weight:600;
  padding:3px 8px;border-radius:999px;
}
.cover-continue{
  position:absolute;right:8px;bottom:8px;z-index:3;
  background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;
  font-size:var(--f-11);font-weight:700;
  padding:4px 10px;border-radius:999px;box-shadow:0 4px 12px rgba(79,124,255,.4);
}
/* 真一键续播:封面层 ▶ 按钮(覆盖在「继续听」标签上) */
.cover-realplay{
  position:absolute;right:6px;bottom:6px;z-index:4;
  width:44px;height:44px;border:none;border-radius:50%;
  background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 6px 16px rgba(79,124,255,.5);cursor:pointer;
}
.cover-realplay svg{width:22px;height:22px}
.cover-realplay:active{transform:scale(.92)}
.book-info{padding:12px 14px 14px}
.book-info .b-title{
  font-size:var(--f-15);font-weight:600;line-height:1.35;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
  overflow:hidden;min-height:2.7em;
}
.book-info .b-meta{color:var(--muted);font-size:var(--f-12);margin-top:6px}
.book-info .b-last{
  color:var(--muted);font-size:var(--f-11);margin-top:4px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.bar{height:4px;border-radius:4px;background:var(--line);margin-top:8px;overflow:hidden}
.bar > i{display:block;height:100%;border-radius:4px;background:linear-gradient(90deg,var(--brand),var(--brand2))}
.foot{text-align:center;color:var(--muted);font-size:var(--f-12);padding:16px 0 30px;opacity:.75}

/* 书架错误/空态 */
.shelf-error{
  grid-column:1/-1;background:var(--card);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:28px 20px;text-align:center;color:var(--muted);
  font-size:var(--f-14);line-height:1.7;
}
.retry-btn{
  margin-top:14px;border:none;border-radius:12px;cursor:pointer;
  background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;
  font-size:var(--f-14);font-weight:600;padding:10px 22px;
  box-shadow:0 6px 16px rgba(79,124,255,.35);
}
.retry-btn:active{transform:scale(.96)}

/* ---------- 播放页顶栏 ---------- */
.pbar-top{
  position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:10px;
  background:var(--dock-bg);backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-radius:16px;padding:12px 14px;box-shadow:var(--shadow);margin-bottom:14px;
}
.pbar-title{flex:1;font-size:var(--f-17);font-weight:700;line-height:1.35;min-width:0}
.icon-btn{
  width:44px;height:44px;border:none;border-radius:12px;
  background:var(--btn-a);color:var(--ink);
  font-size:20px;cursor:pointer;transition:background .15s;flex:none;line-height:1;
  display:flex;align-items:center;justify-content:center;
}
.icon-btn:hover{background:var(--btn-b)}
.icon-btn[aria-pressed="true"]{background:var(--brand-soft);color:var(--brand)}
.icon-btn:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
.icon-btn.lg{width:48px;height:48px;border-radius:14px}
.icon-btn .icn{width:22px;height:22px;color:currentColor}
.icon-btn.lg .icn{width:24px;height:24px}

/* ---------- 设置面板 ---------- */
.settings-panel{
  background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:6px 16px 12px;margin-bottom:14px;
}
.set-row{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}
.set-row:last-child{border-bottom:none}
.set-row > span{font-size:var(--f-13);color:var(--muted);flex:none;width:70px}
.seg{display:flex;gap:6px;flex-wrap:wrap}
.seg button{
  border:none;border-radius:10px;background:var(--btn-a);color:var(--ink);
  font-size:var(--f-12);padding:7px 12px;cursor:pointer;transition:all .15s;
}
.seg button[aria-pressed="true"]{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:600}

/* ---------- 搜索 + 单元快跳 ---------- */
.unit-tabs{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.unit-tabs .icon-btn.small{width:38px;height:38px;font-size:16px;border-radius:11px}
.unit-tabs-scroll{
  display:flex;gap:8px;overflow-x:auto;padding:2px 0;
  scrollbar-width:none;-webkit-overflow-scrolling:touch;
}
.unit-tabs-scroll::-webkit-scrollbar{display:none}
.u-chip{
  flex:none;border:1px solid var(--line);background:var(--card);color:var(--muted);
  font-size:var(--f-12);font-weight:600;padding:8px 14px;border-radius:999px;
  cursor:pointer;transition:all .15s;white-space:nowrap;
}
.u-chip:hover{background:var(--hover)}
.u-chip.active{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border-color:transparent}
.search-bar{display:flex;gap:8px;margin-bottom:12px}
.search-bar input{
  flex:1;border:1px solid var(--line);background:var(--card);color:var(--ink);
  border-radius:12px;padding:11px 14px;font-size:var(--f-14);font-family:inherit;
}
.search-bar input:focus{outline:2px solid var(--brand);outline-offset:-1px}
.mini-btn{
  border:none;border-radius:10px;background:var(--btn-a);color:var(--ink);
  font-size:var(--f-12);padding:0 14px;cursor:pointer;
}
.mini-btn:hover{background:var(--btn-b)}
.no-result{
  background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:22px;text-align:center;color:var(--muted);font-size:var(--f-13);
}

/* ---------- 单元列表 ---------- */
.units{display:flex;flex-direction:column;gap:14px}
.unit-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.unit-card.filtered{display:none}
.unit-head{
  width:100%;display:flex;align-items:center;gap:10px;
  padding:14px 16px;cursor:pointer;user-select:none;
  border:none;background:none;color:inherit;font-family:inherit;text-align:left;
}
.unit-head:focus-visible{outline:3px solid var(--brand);outline-offset:-3px}
.unit-head .u-badge{
  width:44px;height:44px;border-radius:12px;flex:none;
  display:flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:700;color:#fff;
}
.unit-head .u-name{font-size:var(--f-14);font-weight:600;flex:1;min-width:0}
.unit-head .u-count{font-size:var(--f-11);color:var(--muted);flex:none}
.unit-head .u-arrow{color:var(--muted);font-size:13px;transition:transform .2s;flex:none}
.unit-card.open .u-arrow{transform:rotate(180deg)}
.unit-tracks{display:none;border-top:1px solid var(--line)}
.unit-card.open .unit-tracks{display:block;animation:fadein .2s ease}
@keyframes fadein{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}
.track{
  width:100%;display:flex;align-items:center;gap:12px;
  padding:12px 16px;cursor:pointer;border-bottom:1px solid var(--line);
  border-left:none;border-right:none;border-top:none;
  background:none;color:inherit;font-family:inherit;text-align:left;
}
.track.filtered{display:none}
.track:last-child{border-bottom:none}
.track:hover{background:var(--hover)}
.track:focus-visible{outline:3px solid var(--brand);outline-offset:-3px}
.track.active{background:var(--brand-soft)}
.track-idx{
  width:30px;height:30px;border-radius:9px;background:var(--btn-a);color:var(--muted);
  display:flex;align-items:center;justify-content:center;
  font-size:var(--f-12);font-weight:600;flex:none;
}
.track.active .track-idx{background:var(--brand);color:#fff}
.track-name{
  flex:1;min-width:0;font-size:var(--f-14);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.track-dur{color:var(--muted);font-size:var(--f-12);flex:none}
.track-heard{color:var(--brand);font-size:var(--f-11);flex:none}

/* ---------- 底部播放条(分层:主控 + 折叠更多) ---------- */
.dock{
  position:fixed;left:0;right:0;bottom:0;z-index:50;
  background:var(--dock-bg);
  backdrop-filter:blur(18px) saturate(1.5);
  -webkit-backdrop-filter:blur(18px) saturate(1.5);
  box-shadow:var(--dock-shadow);
  border-top:1px solid var(--line);
  padding-bottom:env(safe-area-inset-bottom);
}
.dock-row{
  max-width:1080px;margin:0 auto;display:flex;align-items:center;gap:10px;
  padding:8px 16px;width:100%;
}
.dock-main{gap:12px;padding:8px 14px}
.dock-title-wrap{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}
.dock-title{
  font-size:var(--f-13);font-weight:600;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;cursor:pointer;
}
.dock-progress{display:flex;align-items:center;gap:6px;width:100%}
.dock-progress span{font-size:var(--f-11);color:var(--muted);min-width:34px;text-align:center;flex:none}
#seek{flex:1;accent-color:var(--brand);height:6px;cursor:pointer;border-radius:4px;min-width:60px}
.dock-more{
  border-top:1px dashed var(--line);padding-top:8px;padding-bottom:6px;
  flex-wrap:wrap;gap:8px;
}
.dock-more.hidden{display:none}
.dock-expand{transform:rotate(0deg);transition:transform .2s}
.dock-expand[aria-pressed="true"]{transform:rotate(180deg)}

.ctl-btn{
  /* 44×44 是 iOS HIG / WCAG 推荐的最小触控目标 */
  min-width:44px;min-height:44px;border:none;border-radius:50%;
  background:linear-gradient(145deg,var(--btn-a),var(--btn-b));
  color:var(--ink);font-size:18px;cursor:pointer;
  transition:all .18s ease;display:flex;align-items:center;justify-content:center;
  box-shadow:0 2px 6px rgba(43,58,85,.10), inset 0 1px 0 rgba(255,255,255,.09);
  padding:0;
}
.ctl-btn:active{transform:scale(.90)}
.ctl-btn:hover{background:linear-gradient(145deg,var(--btn-a-h),var(--btn-b-h))}
.ctl-btn:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
.ctl-btn.lg{width:48px;height:48px;font-size:20px}
.ctl-btn.play{
  width:56px;height:56px;
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  color:#fff;font-size:24px;
  box-shadow:0 6px 18px rgba(79,124,255,.42);
}
.ctl-btn.play:active{transform:scale(.92)}
.ctl-btn.wide{
  width:auto;min-width:52px;padding:0 12px;border-radius:22px;
  font-size:var(--f-12);font-weight:700;color:var(--ink);
}
.ctl-btn .icn{width:20px;height:20px;color:currentColor}
.ctl-btn.lg .icn{width:22px;height:22px}
.ctl-btn.play .icn{width:26px;height:26px}
.ctl-btn .ctl-tag{
  display:inline-block;margin-left:2px;font-size:10px;font-weight:800;
  background:rgba(255,255,255,.25);padding:1px 4px;border-radius:6px;line-height:1;
}
.ctl-btn.on,.ctl-btn[aria-pressed="true"]{
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  color:#fff;box-shadow:0 4px 14px rgba(79,124,255,.4);
}
.ctl-btn.dim{opacity:.45}
/* 状态行:显示 A-B 状态或瞬时提示(替代浮层 toast,避免遮挡内容) */
.dock-status{
  text-align:center;font-size:var(--f-11);color:var(--brand);
  padding:2px 16px 4px;font-weight:600;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
/* 书架页:播放条只保留「继续播放」入口,不显示进度与开关 */
.dock.shelf-mode .dock-progress{display:none}
.dock.shelf-mode .dock-more{display:none}
.dock.shelf-mode .dock-expand{display:none}

/* ---------- 课文文本面板(底部抽屉) ---------- */
.lyric-panel{
  position:fixed;left:0;right:0;
  bottom:var(--dock-h);
  z-index:45;
  background:var(--card);
  border-radius:20px 20px 0 0;
  box-shadow:var(--sheet-shadow);
  transform:translateY(110%);
  transition:transform .26s cubic-bezier(.22,.61,.36,1),
             height .18s ease;
  height:var(--lyric-h, 72vh);
  max-height:92vh;
  display:flex;flex-direction:column;
  pointer-events:none;
}
/* 宽屏时限制抽屉宽度并居中,避免行太长 */
@media (min-width:561px){
  .lyric-panel{max-width:1080px;margin-left:auto;margin-right:auto}
}
.lyric-panel.open{transform:translateY(0);pointer-events:auto}
.lyric-head{
  position:relative;
  display:flex;align-items:center;gap:10px;
  padding:14px 16px 10px;font-size:var(--f-13);font-weight:700;color:var(--muted);
  border-bottom:1px solid var(--line);
}
.lyric-grip{
  position:absolute;top:6px;left:50%;transform:translateX(-50%);
  width:44px;height:5px;border-radius:5px;background:var(--line);
  cursor:row-resize;touch-action:none;
}
.lyric-grip:active{background:var(--brand)}
#btn-lyric-max{
  background:var(--bg);border:1px solid var(--line);color:var(--ink);
  font-weight:700;padding:6px 10px;border-radius:10px;cursor:pointer;flex:none;
}
#btn-lyric-max:active{transform:scale(.96)}
/* 单元快速切换条(歌词抽屉内部固定) */
.lyric-units{
  display:flex;gap:6px;overflow-x:auto;padding:8px 14px;
  border-bottom:1px solid var(--line);flex:none;scrollbar-width:none;
}
.lyric-units::-webkit-scrollbar{display:none}
.lyric-units .ly-u-chip{
  flex:none;min-width:52px;height:40px;padding:0 12px;border-radius:20px;
  background:var(--bg);border:1px solid var(--line);color:var(--muted);
  font-size:var(--f-12);font-weight:700;cursor:pointer;text-align:center;
}
.lyric-units .ly-u-chip:active{transform:scale(.96)}
.lyric-units .ly-u-chip.active{
  background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border-color:transparent;
}
#lyric-title{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lyric-tip{font-size:var(--f-11);font-weight:400;color:var(--muted);opacity:.75;flex:none}
#btn-lyric-resume{
  background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;
  font-weight:700;border:none;padding:6px 12px;border-radius:10px;cursor:pointer;
  box-shadow:0 4px 12px rgba(79,124,255,.35);
}
#btn-lyric-resume:active{transform:scale(.96)}
.lyric-body{flex:1;overflow-y:auto;padding:6px 14px 16px;overscroll-behavior:contain}
.ly-line{
  padding:8px 8px 8px 10px;border-left:3px solid transparent;
  border-radius:0 12px 12px 0;transition:all .15s ease;scroll-margin:120px;
}
.ly-line.cur{background:var(--brand-soft);border-left-color:var(--brand);transform:translateX(4px)}
.ly-line.seekable{cursor:pointer}
.ly-line .ly-en{font-size:var(--f-15);line-height:1.5;color:var(--ink)}
.ly-line.cur .ly-en{font-weight:700;color:var(--brand)}
.ly-line .ly-zh{font-size:var(--f-12);color:var(--muted);margin-top:2px;line-height:1.45;display:none}
.ly-seq{font-size:.72em;color:var(--muted);margin-right:4px;white-space:nowrap}
.ly-line.zh-show .ly-zh{display:block}
.ly-line.cur .ly-zh{color:var(--brand)}
.ly-empty{
  text-align:center;color:var(--muted);font-size:var(--f-13);
  padding:32px 16px;line-height:1.6;
}

/* 样式加载哨兵:检测 CSS 是否被线路截断(未加载) */
.style-probe{display:none}

/* ---------- 小屏适配 ---------- */
@media (max-width:560px){
  .grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:14px}
  .hero{padding:22px 0 4px}
  .book-cover{font-size:44px}
  .pbar-title{font-size:var(--f-15)}
  .pbar-top{gap:8px;padding:10px 12px}
  .icon-btn{width:44px;height:44px;font-size:18px;border-radius:11px}
  .icon-btn.lg{width:48px;height:48px}

  /* 播放条:主控一行 + 折叠更多一行;小屏按钮缩到 44×44 但保触控目标 */
  .dock-main{flex-wrap:wrap;gap:8px;padding:8px 10px}
  .dock-title-wrap{flex:1 1 100%;order:0;text-align:center}
  .dock-progress{justify-content:center;margin-top:0}
  .dock-more{gap:6px;padding:6px 10px 4px}
  .ctl-btn{width:44px;height:44px;font-size:16px}
  .ctl-btn.lg{width:48px;height:48px}
  .ctl-btn.play{width:54px;height:54px;font-size:22px}
  .ctl-btn.wide{min-width:46px;padding:0 8px;font-size:var(--f-11)}
  .ctl-btn .icn{width:18px;height:18px}
  .ctl-btn.lg .icn{width:22px;height:22px}
  .ctl-btn.play .icn{width:24px;height:24px}
  .dock-status{padding:2px 10px 3px}
  /* 手机:顶部工具按钮下沉到播放条折叠区(单手可达);课文高度由 --lyric-h 控制 */
  .m-phone .pbar-top .icon-btn{display:none}
  .m-phone .unit-tabs .icon-btn{display:none}
  .m-phone .dock-more{flex-wrap:wrap;justify-content:center;gap:6px;padding:6px 10px 8px}
  .m-phone .dock-more .ctl-btn{flex:1 1 auto;max-width:96px}
}

/* 桌面:两个按钮组之间加视觉分隔 */
@media (min-width:561px){
  .dock-controls + .dock-controls{padding-left:12px;border-left:1px solid var(--line)}
}