:root {
  --bg:#0f0f14;--surface:#1a1a24;--surface2:#22222f;--border:#2a2a3a;
  --text:#e4e4ec;--text-dim:#8888a0;--accent:#f08060;--accent-glow:rgba(240,128,96,0.3);
  --play:#60d0a0;--danger:#e0556a;--radius:12px;--radius-sm:8px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"SF Mono","Fira Code","Cascadia Code",monospace;--shadow:0 2px 8px rgba(0,0,0,0.3);
}
body.light {
  --bg:#f5f5f7;--surface:#fff;--surface2:#eaeaef;--border:#d5d5dd;
  --text:#1a1a2e;--text-dim:#7a7a8e;--accent:#e05550;
  --accent-glow:rgba(224,85,80,0.2);--shadow:0 2px 8px rgba(0,0,0,0.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%;-webkit-tap-highlight-color:transparent}
body{
  font-family:var(--font);background:var(--bg);color:var(--text);
  display:flex;flex-direction:column;overflow:hidden;
  user-select:none;-webkit-user-select:none;transition:background .3s,color .3s;
}
#topbar{
  display:flex;align-items:center;gap:8px;padding:6px 14px;
  background:var(--surface);border-bottom:1px solid var(--border);
  flex-shrink:0;position:relative;z-index:500;transition:background .3s;flex-wrap:wrap;
}
#topbar .logo{font-size:17px;font-weight:700;letter-spacing:-.5px;color:var(--accent);white-space:nowrap}
#topbar .logo span{color:var(--text-dim);font-weight:400}
#topbar .spacer{flex:1;min-width:6px}
.ctrl-group{display:flex;align-items:center;gap:4px;font-size:11px;color:var(--text-dim)}
.ctrl-group select,.ctrl-group input[type=range]{
  background:var(--surface2);color:var(--text);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:3px 5px;font-size:11px;outline:none;cursor:pointer;
}
.ctrl-group select:focus{border-color:var(--accent)}
.ctrl-group input[type=range]{
  -webkit-appearance:none;height:3px;padding:0;background:var(--border);width:56px;
}
.ctrl-group input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:12px;height:12px;border-radius:50%;background:var(--accent);cursor:pointer;
}
.speed-preset{
  padding:2px 6px;border-radius:4px;font-size:11px;background:var(--surface2);
  color:var(--text-dim);cursor:pointer;border:1px solid transparent;
  transition:all .15s;font-family:var(--mono);
}
.speed-preset:hover{border-color:var(--border);color:var(--text)}
.speed-preset.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-icon{
  background:none;border:none;color:var(--text-dim);cursor:pointer;
  font-size:15px;padding:3px 7px;border-radius:var(--radius-sm);
  transition:all .15s;position:relative;white-space:nowrap;
}
.btn-icon:hover{color:var(--text);background:var(--surface2)}
.btn-icon.active{color:var(--accent)}
.sleep-timer-badge{
  position:absolute;top:-2px;right:-2px;background:var(--accent);color:#fff;
  border-radius:10px;font-size:9px;padding:1px 4px;display:none;line-height:1.3;pointer-events:none;
}
.sleep-timer-badge.show{display:block}

#main{display:flex;flex:1;overflow:hidden}

/* Sidebar */
#sidebar{
  width:260px;background:var(--surface);border-right:1px solid var(--border);
  display:flex;flex-direction:column;flex-shrink:0;transition:width .25s,background .3s;overflow:hidden;
}
#sidebar.collapsed{width:0;border:none}
#sidebar-header{
  padding:10px 12px;display:flex;align-items:center;justify-content:space-between;
  border-bottom:1px solid var(--border);flex-shrink:0;gap:6px;
}
#sidebar-header h3{font-size:11px;text-transform:uppercase;letter-spacing:1px;color:var(--text-dim);flex:1}
#sidebar-header button{background:none;border:none;color:var(--text-dim);cursor:pointer;font-size:15px;padding:2px 5px;border-radius:4px}
#sidebar-header button:hover{color:var(--text);background:var(--surface2)}
#btn-close-sidebar{display:none;background:none;border:none;color:var(--text-dim);cursor:pointer;font-size:15px;padding:2px 5px;border-radius:4px}
#btn-close-sidebar:hover{color:var(--danger);background:var(--surface2)}
#episode-list{flex:1;overflow-y:auto;padding:5px}
#episode-list::-webkit-scrollbar{width:4px}
#episode-list::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}
.ep-card{
  padding:8px 9px;border-radius:var(--radius-sm);cursor:pointer;margin-bottom:2px;
  transition:background .15s;display:flex;align-items:center;gap:6px;border-left:3px solid transparent;
}
.ep-card:hover{background:var(--surface2)}
.ep-card.active{background:var(--surface2);border-left-color:var(--accent)}
.ep-card .ep-info{flex:1;min-width:0}
.ep-card .ep-title{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ep-card .ep-meta{font-size:10px;color:var(--text-dim);margin-top:1px}
.ep-card .ep-del{opacity:0;background:none;border:none;color:var(--danger);cursor:pointer;font-size:13px;padding:2px 4px;border-radius:4px;transition:opacity .15s}
.ep-card:hover .ep-del{opacity:1}
.ep-card .ep-del:hover{background:rgba(224,85,106,.15)}

/* Content */
#content-area{flex:1;display:flex;flex-direction:column;overflow:hidden;position:relative}
#title-row{display:flex;align-items:center;gap:6px;padding-right:24px;flex-shrink:0}
#title-input{
  width:100%;border:none;background:transparent;color:var(--text);
  font-size:19px;font-weight:600;padding:12px 0 6px 24px;outline:none;font-family:var(--font);
}
#title-input::placeholder{color:var(--text-dim)}
#btn-bookmark{background:none;border:none;color:var(--text-dim);cursor:pointer;font-size:17px;padding:4px;border-radius:4px;transition:all .15s}
#btn-bookmark:hover{color:var(--accent)}
#btn-annotate{background:none;border:none;color:var(--text-dim);cursor:pointer;font-size:15px;padding:4px;border-radius:4px;transition:all .15s}
#btn-annotate:hover{color:var(--accent)}

#text-display{
  flex:1;overflow-y:auto;padding:4px 24px 16px;font-size:16px;line-height:1.8;
  letter-spacing:.01em;white-space:pre-wrap;word-break:break-word;
}
#text-display::-webkit-scrollbar{width:6px}
#text-display::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
#text-display[contenteditable="true"]{cursor:text;user-select:text;-webkit-user-select:text;outline:none}
#text-display[contenteditable="true"]:empty::before{
  content:"长按这里粘贴文字，或点 📁 导入文件…";color:var(--text-dim);pointer-events:none;
}
#text-display mark{background:var(--accent);color:#fff;border-radius:2px;padding:0 1px;transition:background .1s}
#text-display .ann-mark{background:rgba(96,208,160,.25);border-bottom:2px dotted var(--play);cursor:pointer;padding:0 1px}
#text-display .ann-mark:hover{background:rgba(96,208,160,.4)}

/* Focus mode */
#text-display.focus-mode{font-size:22px;line-height:2;max-width:700px;margin:0 auto;padding:40px 24px}
#text-display.focus-mode .para{opacity:.25;transition:opacity .3s}
#text-display.focus-mode .para.active{opacity:1}

/* Karaoke mode */
#text-display.karaoke-mode{
  font-size:28px;line-height:2.2;text-align:center;max-width:600px;margin:0 auto;
  padding:30vh 24px;display:flex;flex-direction:column;align-items:center;justify-content:center;
}
#karaoke-line{display:none;font-size:32px;font-weight:700;line-height:1.6;text-align:center;transition:all .3s;padding:20px}

/* Drop overlay */
#drop-overlay{
  position:absolute;inset:0;background:rgba(240,128,96,.08);border:3px dashed var(--accent);
  border-radius:var(--radius);display:none;align-items:center;justify-content:center;
  font-size:20px;color:var(--accent);z-index:20;pointer-events:none;margin:16px;
}
#drop-overlay.show{display:flex}

/* Player bar */
#player-bar{
  background:var(--surface);border-top:1px solid var(--border);padding:7px 16px;
  flex-shrink:0;display:flex;flex-direction:column;gap:3px;position:relative;z-index:500;transition:background .3s;
}
#progress-row{display:flex;align-items:center;gap:8px}
#progress-bar{flex:1;height:4px;background:var(--border);border-radius:2px;cursor:pointer;overflow:hidden;position:relative}
#progress-fill{height:100%;background:var(--accent);border-radius:2px;width:0%;transition:width .1s linear}
#time-display{font-size:10px;color:var(--text-dim);font-variant-numeric:tabular-nums;font-family:var(--mono);min-width:88px;text-align:right;white-space:nowrap}
#controls-row{display:flex;align-items:center;justify-content:center;gap:10px}
.btn{background:none;border:none;cursor:pointer;color:var(--text-dim);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .15s}
.btn:hover{color:var(--text)}
.btn:active{transform:scale(.92)}
#btn-play{width:40px;height:40px;background:var(--accent);color:#fff;font-size:16px}
#btn-play:hover{filter:brightness(1.1)}
.btn-skip{font-size:14px;width:28px;height:28px}

/* Modal */
#modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:500;display:none;align-items:center;justify-content:center;padding:16px}
#modal-overlay.show{display:flex}
#modal{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;max-width:500px;width:100%;max-height:85vh;overflow-y:auto;box-shadow:var(--shadow);transition:background .3s}
#modal h3{font-size:15px;margin-bottom:12px;color:var(--text)}
#modal label{display:block;font-size:12px;color:var(--text-dim);margin-bottom:3px}
#modal input[type=text],#modal input[type=url],#modal input[type=password],#modal textarea,#modal select{
  width:100%;background:var(--surface2);color:var(--text);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:7px 9px;font-size:12px;outline:none;
  font-family:var(--font);margin-bottom:10px;resize:vertical;
}
#modal input:focus,#modal textarea:focus,#modal select:focus{border-color:var(--accent)}
#modal .row{display:flex;gap:6px;flex-wrap:wrap}
#modal button{
  background:var(--accent);color:#fff;border:none;padding:7px 14px;
  border-radius:var(--radius-sm);cursor:pointer;font-size:12px;font-family:var(--font);
}
#modal button:hover{filter:brightness(1.1)}
#modal button.secondary{background:var(--surface2);color:var(--text)}
#modal .divider{border-top:1px solid var(--border);margin:12px 0}
#modal .tabs{display:flex;gap:4px;margin-bottom:12px;flex-wrap:wrap}
#modal .tab-btn{padding:5px 10px;border-radius:4px;font-size:11px;background:var(--surface2);color:var(--text-dim);cursor:pointer;border:1px solid transparent}
#modal .tab-btn.active{background:var(--accent);color:#fff}
#modal kbd{
  background:var(--surface2);border:1px solid var(--border);border-radius:4px;
  padding:1px 6px;font-size:11px;font-family:var(--mono);color:var(--accent)
}

/* Bookmarks panel */
#bookmark-panel{
  position:absolute;right:6px;top:46px;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:6px;min-width:170px;max-height:220px;overflow-y:auto;
  box-shadow:var(--shadow);z-index:30;display:none;
}
#bookmark-panel.show{display:block}
#bookmark-panel .bm-item{
  padding:5px 7px;font-size:12px;cursor:pointer;border-radius:4px;color:var(--text);
  display:flex;justify-content:space-between;align-items:center;
}
#bookmark-panel .bm-item:hover{background:var(--surface2)}
#bookmark-panel .bm-item .bm-del{color:var(--danger);font-size:11px;cursor:pointer;padding:2px 5px}
#bookmark-panel .bm-empty{color:var(--text-dim);font-size:11px;text-align:center;padding:10px}

/* Stats panel */
#stats-panel{
  position:fixed;bottom:0;left:0;right:0;background:var(--surface);border-top:1px solid var(--border);
  z-index:90;padding:12px 20px;display:none;flex-direction:column;gap:8px;font-size:13px;
}
#stats-panel.show{display:flex}
#stats-panel .stat-row{display:flex;justify-content:space-between;color:var(--text-dim)}
#stats-panel .stat-row strong{color:var(--text)}
#stats-close{position:absolute;top:4px;right:8px;background:none;border:none;color:var(--text-dim);cursor:pointer;font-size:18px}

/* Annotation tooltip */
#ann-tooltip{
  position:absolute;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:10px;max-width:260px;box-shadow:var(--shadow);
  z-index:35;display:none;font-size:12px;line-height:1.5;
}
#ann-tooltip.show{display:block}
#ann-tooltip .ann-note{color:var(--text);margin-bottom:4px}
#ann-tooltip button{background:none;border:none;color:var(--danger);cursor:pointer;font-size:11px;padding:2px 4px}

/* Toast */
#toast{
  position:fixed;bottom:100px;left:50%;transform:translateX(-50%);
  background:var(--surface2);color:var(--text);padding:7px 16px;border-radius:20px;
  font-size:12px;border:1px solid var(--border);opacity:0;transition:opacity .3s;
  pointer-events:none;z-index:300;white-space:nowrap;
}
#toast.show{opacity:1}

#ann-toolbar{position:absolute;background:var(--accent);color:#fff;padding:4px 8px;border-radius:4px;font-size:11px;z-index:40;display:none;cursor:pointer;white-space:nowrap}

/* Tutorial overlay */
#tutorial-overlay{position:fixed;inset:0;background:rgba(0,0,0,.75);z-index:400;display:none;align-items:center;justify-content:center;pointer-events:none}
#tutorial-overlay.show{display:flex}
#tutorial-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:24px 20px 20px;max-width:380px;width:90%;
  box-shadow:var(--shadow);text-align:center;position:relative;transition:background .3s;
  pointer-events:auto;
}
#tutorial-card h2{font-size:20px;color:var(--accent);margin-bottom:4px}
#tutorial-card .tut-subtitle{font-size:12px;color:var(--text-dim);margin-bottom:16px}
#tutorial-card .tut-icon{font-size:48px;display:block;margin-bottom:8px}
#tutorial-card .tut-body{font-size:14px;color:var(--text);line-height:1.7;margin-bottom:16px;text-align:left}
#tutorial-card .tut-body kbd{
  background:var(--surface2);border:1px solid var(--border);border-radius:4px;
  padding:1px 5px;font-size:12px;font-family:var(--mono);color:var(--accent)
}
#tutorial-card .tut-step-dots{display:flex;justify-content:center;gap:6px;margin-bottom:16px}
#tutorial-card .tut-step-dot{width:8px;height:8px;border-radius:50%;background:var(--border);transition:background .2s}
#tutorial-card .tut-step-dot.active{background:var(--accent)}
#tutorial-card .tut-buttons{display:flex;gap:8px;justify-content:center}
#tutorial-card button{
  background:var(--accent);color:#fff;border:none;padding:8px 20px;border-radius:var(--radius-sm);
  cursor:pointer;font-size:13px;font-family:var(--font);transition:filter .15s;
}
#tutorial-card button:hover{filter:brightness(1.1)}
#tutorial-card button.secondary{background:var(--surface2);color:var(--text)}
#tutorial-card button.link{background:none;color:var(--text-dim);font-size:11px;padding:4px 8px;text-decoration:underline}
#tutorial-card .tut-spotlight{
  position:absolute;border:2px solid var(--accent);border-radius:6px;
  box-shadow:0 0 0 9999px rgba(0,0,0,.6);pointer-events:none;z-index:-1;transition:all .35s ease;
}
#help-btn{
  position:fixed;bottom:80px;right:16px;width:36px;height:36px;
  background:var(--accent);color:#fff;border:none;border-radius:50%;
  font-size:18px;cursor:pointer;z-index:100;box-shadow:var(--shadow);
  display:flex;align-items:center;justify-content:center;transition:transform .15s;
}
#help-btn:hover{transform:scale(1.1)}

/* Feature tour tooltips */
.feature-tip{
  position:fixed;background:var(--surface);border:1px solid var(--accent);
  border-radius:var(--radius-sm);padding:8px 12px;font-size:12px;color:var(--text);
  box-shadow:0 0 16px var(--accent-glow);z-index:350;max-width:200px;line-height:1.5;
  pointer-events:none;opacity:0;transition:opacity .3s;text-align:left;
}
.feature-tip.show{opacity:1}
.feature-tip::after{
  content:'';position:absolute;bottom:-6px;left:50%;transform:translateX(-50%);
  width:0;height:0;border-left:6px solid transparent;border-right:6px solid transparent;
  border-top:6px solid var(--accent);
}
.feature-tip.bottom::after{top:-6px;bottom:auto;border-top:none;border-bottom:6px solid var(--accent)}

/* Demo content badge */
#demo-badge{
  position:absolute;top:50px;right:20px;background:var(--accent);color:#fff;
  padding:3px 10px;border-radius:10px;font-size:11px;z-index:15;display:none;
  cursor:pointer;animation:pulse 2s infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.6}}

@media (max-width:700px){
  /* ---- Mobile-first layout ---- */
  #sidebar{position:fixed;left:0;top:0;bottom:0;z-index:50;width:280px}
  #sidebar.collapsed{width:0}
  #btn-close-sidebar{display:inline-block}

  /* Bigger touch targets — Apple HIG minimum 44x44pt */
  .btn-icon{
    font-size:18px;padding:8px 10px;min-width:40px;min-height:40px;
    display:inline-flex;align-items:center;justify-content:center;
  }
  .speed-preset{padding:6px 10px;font-size:13px;min-width:44px;text-align:center}
  .ctrl-group select{font-size:13px;padding:6px 8px;min-height:36px}

  /* Topbar: horizontal scroll on small screens, no wrap */
  #topbar{
    gap:3px;padding:6px 6px;flex-wrap:nowrap;overflow-x:auto;
    -webkit-overflow-scrolling:touch;scrollbar-width:none;
  }
  #topbar::-webkit-scrollbar{display:none}
  #topbar .logo{font-size:14px;flex-shrink:0;margin-right:2px}
  #topbar .spacer{display:none}
  #speed-presets{flex-shrink:0}

  /* Player bar: bigger controls */
  #player-bar{padding:8px 12px;gap:6px}
  #progress-bar{height:8px;border-radius:4px}
  #progress-fill{border-radius:4px}
  #time-display{font-size:12px;min-width:96px}
  #controls-row{gap:18px}
  #btn-play{width:56px;height:56px;font-size:22px}
  .btn-skip{font-size:18px;width:44px;height:44px}
  #btn-export-mp3{font-size:13px;padding:8px 14px;min-height:44px;border-radius:6px}

  /* Title row */
  #title-row{padding-right:8px;gap:4px}
  #title-input{padding:12px 10px 6px;font-size:17px}
  #btn-bookmark,#btn-annotate{font-size:20px;padding:8px}

  /* Text area */
  #text-display{padding:4px 12px 12px;font-size:15px}
  #text-display.focus-mode{font-size:18px;padding:24px 12px}
  #text-display.karaoke-mode{font-size:22px;padding:20vh 12px}
  #karaoke-line{font-size:26px}

  /* Sidebar */
  #sidebar-header h3{font-size:13px}
  #sidebar-header button{font-size:18px;padding:6px 8px}
  .ep-card{padding:12px 10px}
  .ep-card .ep-title{font-size:14px}
  .ep-card .ep-meta{font-size:11px}
  .ep-card .ep-del{opacity:0.6;font-size:18px;padding:4px 8px}
  .ep-card:active{background:var(--accent-glow)}

  /* Toast higher above player bar */
  #toast{bottom:130px;font-size:14px;padding:10px 20px}

  /* Help button reposition */
  #help-btn{bottom:106px;right:12px;width:44px;height:44px;font-size:22px}

  /* Modal: mobile-friendly */
  #modal{max-width:100vw;padding:16px;border-radius:var(--radius) var(--radius) 0 0;max-height:90vh;margin-top:auto}
  #modal label{font-size:14px}
  #modal input[type=text],#modal input[type=url],#modal input[type=password],#modal textarea,#modal select{
    font-size:16px;padding:10px 12px;
  }
  #modal button{font-size:15px;padding:12px 18px}
  #modal .tabs{gap:6px}
  #modal .tab-btn{font-size:13px;padding:8px 14px}
  #modal kbd{font-size:13px;padding:2px 8px}

  /* Tutorial card */
  #tutorial-card{max-width:94vw;padding:20px 16px 16px}
  #tutorial-card h2{font-size:18px}
  #tutorial-card .tut-body{font-size:15px;line-height:1.8}
  #tutorial-card button{font-size:15px;padding:12px 22px}
}