/* ===== 导航与控制 ===== */

/* 顶部进度条 */
#progress{
  position:fixed;
  left:0;top:0;
  height:3px;
  background:linear-gradient(90deg,var(--red),var(--red-l));
  z-index:100;
  width:0;
  transition:width .45s cubic-bezier(.4,0,.2,1);
  box-shadow:0 0 10px rgba(199,0,11,.5);
}

/* 右上角页码 + 操作区 */
#hud{
  position:fixed;
  right:24px;top:18px;
  z-index:100;
  display:flex;
  align-items:center;
  gap:10px;
  opacity:0;
  transition:opacity .3s;
}
#stage:hover #hud,#hud.show{opacity:1}
#hud .hud-page{
  font-family:var(--font-num);
  font-size:13px;
  font-weight:800;
  color:rgba(255,255,255,.8);
  letter-spacing:.08em;
  background:rgba(0,0,0,.4);
  backdrop-filter:blur(8px);
  padding:7px 14px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.12);
}
#hud .hud-btn{
  width:34px;height:34px;
  border-radius:50%;
  background:rgba(0,0,0,.4);
  backdrop-filter:blur(8px);
  border:1px solid rgba(255,255,255,.12);
  color:rgba(255,255,255,.82);
  display:flex;align-items:center;justify-content:center;
  font-size:14px;
  transition:background .2s,color .2s,border-color .2s;
}
#hud .hud-btn:hover{background:var(--red);color:#fff;border-color:var(--red)}
#hud .hud-btn.on{background:var(--red);color:#fff;border-color:var(--red)}

/* 右侧目录导航 */
#dots{
  position:fixed;
  right:26px;
  top:50%;
  transform:translateY(-50%);
  z-index:100;
  display:flex;
  flex-direction:column;
  gap:9px;
  opacity:0;
  transition:opacity .3s;
}
#stage:hover #dots,#dots.show{opacity:1}
#dots .dot{
  width:8px;height:8px;
  border-radius:50%;
  background:rgba(255,255,255,.26);
  cursor:pointer;
  position:relative;
  transition:background .25s,transform .25s;
}
#dots .dot:hover{background:rgba(255,255,255,.6);transform:scale(1.3)}
#dots .dot.on{
  background:var(--red-l);
  transform:scale(1.5);
  box-shadow:0 0 0 3px rgba(226,38,46,.22);
}
#dots .dot .tip{
  position:absolute;
  right:22px;top:50%;
  transform:translateY(-50%) translateX(6px);
  background:rgba(20,23,28,.94);
  backdrop-filter:blur(10px);
  color:#fff;
  font-size:12px;
  font-weight:600;
  padding:7px 13px;
  border-radius:7px;
  white-space:nowrap;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s,transform .2s;
  border:1px solid rgba(255,255,255,.1);
  letter-spacing:.02em;
}
#dots .dot:hover .tip{opacity:1;transform:translateY(-50%) translateX(0)}

/* 底部操作提示 */
#hint{
  position:fixed;
  left:50%;bottom:22px;
  transform:translateX(-50%);
  z-index:100;
  display:flex;
  align-items:center;
  gap:14px;
  font-size:12px;
  color:rgba(255,255,255,.55);
  background:rgba(0,0,0,.4);
  backdrop-filter:blur(8px);
  padding:9px 20px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.1);
  transition:opacity .4s;
  letter-spacing:.03em;
}
#hint kbd{
  font-family:var(--font-num);
  font-size:11px;
  background:rgba(255,255,255,.14);
  padding:2px 7px;
  border-radius:4px;
  border:1px solid rgba(255,255,255,.14);
  font-weight:700;
}
#hint .hint-sep{width:1px;height:12px;background:rgba(255,255,255,.18)}
#hint.hide{opacity:0;pointer-events:none}

/* 概览模式（缩略图墙） */
#overview{
  position:fixed;
  inset:0;
  z-index:200;
  background:rgba(14,16,20,.96);
  backdrop-filter:blur(14px);
  padding:56px 60px;
  overflow-y:auto;
  display:none;
}
#overview.show{display:block}
#overview .ov-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:26px;
}
#overview .ov-t{
  color:#fff;font-size:20px;font-weight:800;letter-spacing:.02em;
}
#overview .ov-t small{
  display:block;font-size:12px;font-weight:600;
  color:rgba(255,255,255,.42);margin-top:5px;letter-spacing:.06em;
}
#overview .ov-close{
  color:rgba(255,255,255,.7);font-size:13px;font-weight:700;
  padding:9px 18px;border-radius:8px;
  border:1px solid rgba(255,255,255,.16);
  transition:background .2s,color .2s;
}
#overview .ov-close:hover{background:rgba(255,255,255,.1);color:#fff}
#overview .ov-grid{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:18px;
}
#overview .ov-item{
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.1);
  border-radius:10px;
  padding:16px 16px 15px;
  cursor:pointer;
  transition:background .2s,border-color .2s,transform .2s;
  position:relative;
  overflow:hidden;
}
#overview .ov-item:hover{
  background:rgba(199,0,11,.16);
  border-color:rgba(226,38,46,.5);
  transform:translateY(-2px);
}
#overview .ov-item.on{
  background:rgba(199,0,11,.24);
  border-color:var(--red-l);
}
#overview .ov-item .oi-n{
  font-family:var(--font-num);
  font-size:11px;font-weight:800;
  color:rgba(255,255,255,.36);
  letter-spacing:.1em;
  margin-bottom:9px;
}
#overview .ov-item.on .oi-n{color:var(--red-l)}
#overview .ov-item .oi-t{
  color:rgba(255,255,255,.9);
  font-size:13.5px;
  font-weight:700;
  line-height:1.45;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
#overview .ov-item .oi-sec{
  margin-top:9px;
  font-size:10.5px;
  color:rgba(255,255,255,.32);
  letter-spacing:.06em;
}

/* ===== 演讲者视图 ===== */
#notes{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:150;
  background:rgba(20,23,28,.97);
  backdrop-filter:blur(12px);
  border-top:2px solid var(--red);
  padding:18px 28px 20px;
  transform:translateY(100%);
  transition:transform .35s cubic-bezier(.2,.8,.3,1);
  max-height:34vh;
  overflow-y:auto;
}
#notes.show{transform:none}
#notes .nt-h{
  display:flex;align-items:center;gap:10px;
  font-size:11px;font-weight:800;
  color:var(--red-l);
  letter-spacing:.16em;
  margin-bottom:10px;
}
#notes .nt-b{
  font-size:14px;line-height:1.8;color:rgba(255,255,255,.82);
}
#notes .nt-b li{margin-left:20px;margin-bottom:5px}
#notes .nt-b b{color:#ff9ba0}

/* ===== 隐藏帮助面板 ===== */
#help{
  position:fixed;
  inset:0;z-index:300;
  background:rgba(10,12,15,.92);
  backdrop-filter:blur(10px);
  display:none;
  align-items:center;justify-content:center;
}
#help.show{display:flex}
#help .hp-box{
  background:#1d2126;
  border:1px solid rgba(255,255,255,.12);
  border-radius:16px;
  padding:34px 40px;
  min-width:520px;
  box-shadow:0 24px 64px rgba(0,0,0,.5);
}
#help .hp-t{
  font-size:19px;font-weight:800;color:#fff;
  margin-bottom:22px;display:flex;align-items:center;gap:10px;
}
#help .hp-t::before{content:"";width:4px;height:18px;background:var(--red);border-radius:2px}
#help table{width:100%;border-collapse:collapse}
#help td{
  padding:9px 0;
  color:rgba(255,255,255,.76);
  font-size:13.5px;
  border-bottom:1px solid rgba(255,255,255,.07);
}
#help td:first-child{width:170px}
#help tr:last-child td{border-bottom:none}
#help kbd{
  font-family:var(--font-num);
  font-size:11.5px;
  background:rgba(255,255,255,.1);
  padding:3px 9px;
  border-radius:5px;
  border:1px solid rgba(255,255,255,.14);
  color:#fff;font-weight:700;
  margin-right:5px;
  display:inline-block;
}
#help .hp-esc{
  margin-top:20px;
  font-size:12px;color:rgba(255,255,255,.36);
  text-align:center;
}

/* ===== 打印 / 导出 PDF ===== */
@media print{
  @page{size:1600px 900px;margin:0}
  html,body{overflow:visible;background:#fff}
  #stage{position:static;display:block}
  #deck{width:1600px;height:auto;transform:none!important}
  .slide{
    position:relative!important;
    opacity:1!important;visibility:visible!important;transform:none!important;
    width:1600px;height:900px;
    page-break-after:always;
    break-after:page;
  }
  #progress,#hud,#dots,#hint,#overview,#notes,#help{display:none!important}
  .anim{opacity:1!important;transform:none!important}
}