:root{
  --bg:#07090c; --panel:#12161d; --line:#232a35;
  --text:#e8ecf2; --sub:#7d8798;
  --a:#4ea8de; --b:#f2a65a; --main:#8b9aa8; --live:#e5484d; --ok:#7bc47f;
}
*{box-sizing:border-box;}
html,body{margin:0;height:100%;overflow:hidden;background:var(--bg);color:var(--text);
  font-family:"Segoe UI",Hiragino Sans,Meiryo,sans-serif;}

/* ===== ステージ ===== */
#stage{position:fixed;inset:0;background:#000;}
.layer{position:absolute;inset:0;}
.layer iframe{width:100%;height:100%;border:0;display:block;}
.layer.front{z-index:3;}
.layer.back{z-index:1;}
/* 省帯域: 背面は最小サイズまで縮小し低解像度で受信させる（下限200x200px） */
.layer.back.eco{inset:auto;left:0;bottom:0;width:240px;height:200px;}

/* iframeにフォーカスを奪われないようクリックを遮断 */
#shield{position:fixed;inset:0;z-index:5;background:transparent;}

/* ===== 再生開始ゲート（ブラウザ自動再生制限の解除用） ===== */
/* 背景は張らずボタンだけ浮かせる。setup / bar は常に前面で操作可能 */
#startGate{
  position:fixed;inset:0;z-index:12;
  display:flex;align-items:center;justify-content:center;
  padding:130px 24px 260px;
  pointer-events:none;
}
#startGate #startPlay{pointer-events:auto;}
#startGate.hidden{display:none;}
#startPlay{
  display:flex;flex-direction:column;align-items:center;gap:8px;
  min-width:min(340px,90vw);padding:28px 32px 22px;
  border:1px solid rgba(255,255,255,.14);border-radius:16px;
  background:linear-gradient(180deg,#1a2230,#10151d);
  color:var(--text);cursor:pointer;
  box-shadow:0 18px 50px rgba(0,0,0,.55),0 0 0 1px rgba(78,168,222,.18);
  transition:transform .12s,border-color .12s,box-shadow .12s;
}
#startPlay:hover{
  transform:translateY(-1px);
  border-color:rgba(78,168,222,.55);
  box-shadow:0 22px 56px rgba(0,0,0,.6),0 0 0 1px rgba(78,168,222,.35);
}
#startPlay:active{transform:translateY(1px);}
#startPlay .playIcon{
  width:60px;height:60px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--a);color:#04060a;
  font-size:1.45rem;font-weight:800;padding-left:4px;
  box-shadow:0 8px 28px rgba(78,168,222,.35);
}
#startPlay .playLabel{font-size:1.2rem;font-weight:800;letter-spacing:.04em;}
#startPlay small{font-size:.76rem;color:var(--sub);font-weight:500;line-height:1.5;}

/* ===== 導入画面 ===== */
#splash{
  position:fixed;inset:0;z-index:16;background:#07090c;
  display:flex;align-items:center;justify-content:center;padding:24px;overflow-y:auto;
}
#splash.gone{display:none;}
.card{max-width:600px;width:100%;}
.card h2{margin:0 0 6px;font-size:1.5rem;font-weight:800;letter-spacing:.02em;}
.card h2 span{color:var(--a);}
.card .lead{margin:0 0 22px;color:var(--sub);font-size:.88rem;line-height:1.7;}
.card ol{margin:0;padding-left:1.3em;color:var(--sub);font-size:.84rem;line-height:1.9;}
.card ol b{color:var(--text);}
.card ol code{background:#0b0e13;padding:1px 6px;border-radius:4px;color:var(--a);
  font-family:ui-monospace,monospace;font-size:.9em;}
.card .kbdline{
  margin-top:20px;padding:14px 16px;background:var(--panel);border:1px solid var(--line);
  border-radius:8px;font-size:.82rem;color:var(--sub);line-height:2;
}
.card .kbdline b{color:var(--text);}
.splashContact{
  margin:16px 0 0;font-size:.78rem;color:var(--sub);
}
.splashContact a{color:var(--a);text-decoration:none;font-weight:700;}
.splashContact a:hover{text-decoration:underline;}
.notice{
  margin-top:20px;padding:12px 14px;
  background:rgba(242,166,90,.08);border:1px solid rgba(242,166,90,.35);
  border-radius:8px;font-size:.79rem;color:var(--b);line-height:1.8;
}
.notice b{color:var(--b);}

/* ===== セットアップ ===== */
#setup{
  position:fixed;top:0;left:0;right:0;z-index:20;
  background:rgba(9,12,17,.97);border-bottom:1px solid var(--line);
  padding:14px 18px;display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end;
  backdrop-filter:blur(6px);
}
#setup.hidden{display:none;}
.field{flex:1 1 220px;display:flex;flex-direction:column;gap:5px;min-width:180px;}
.field label{font-size:.68rem;letter-spacing:.09em;text-transform:uppercase;color:var(--sub);}
.field input{
  background:#04060a;border:1px solid var(--line);border-radius:6px;
  padding:9px 10px;color:var(--text);font-size:.85rem;line-height:1.5;
  /* monospace は日本語 Windows で MS Gothic になり、input 内の _ が下端で切れる */
  font-family:Consolas,"Cascadia Mono","Segoe UI Mono",ui-monospace,monospace;
}
.field input:focus{outline:none;border-color:var(--a);}
#setup button{
  height:37px;padding:0 18px;border-radius:6px;border:none;cursor:pointer;
  font-weight:700;font-size:.83rem;background:var(--a);color:#04060a;
}
#setup .ghost{background:transparent;border:1px solid var(--line);color:var(--sub);font-weight:500;}
#setup .ghost:hover{border-color:var(--sub);color:var(--text);}

/* ===== コントロールバー ===== */
#bar{
  position:fixed;bottom:0;left:0;right:0;z-index:20;
  background:linear-gradient(to top,rgba(7,9,12,.97),rgba(7,9,12,.8) 78%,transparent);
  padding:24px 18px 12px;display:flex;flex-direction:column;gap:12px;
  transition:opacity .25s;
}
#bar.hidden{opacity:0;pointer-events:none;}

.primaryRow{display:flex;gap:20px;align-items:center;flex-wrap:wrap;}
.secondaryRow{
  display:flex;gap:16px;align-items:center;flex-wrap:wrap;
  padding-top:10px;border-top:1px solid rgba(255,255,255,.06);
}
.secondaryRow .group>span{font-size:.6rem;}
.secondaryRow .pill{padding:5px 10px;font-size:.76rem;font-weight:500;}

.group{display:flex;flex-direction:column;gap:6px;}
.group>span{font-size:.65rem;letter-spacing:.1em;text-transform:uppercase;color:var(--sub);}
.row{display:flex;gap:6px;align-items:center;}

.pill{
  background:rgba(255,255,255,.05);border:1px solid var(--line);color:var(--sub);
  border-radius:6px;padding:8px 15px;cursor:pointer;font-size:.85rem;font-weight:600;transition:.12s;
}
.pill:hover{border-color:var(--sub);color:var(--text);}
.pill kbd{font:inherit;font-size:.65rem;opacity:.5;margin-left:7px;}
.pill.on{color:#04060a;}
.pill.on[data-k="main"]{background:var(--main);border-color:var(--main);}
.pill.on[data-k="a"]{background:var(--a);border-color:var(--a);}
.pill.on[data-k="b"]{background:var(--b);border-color:var(--b);}
.pill.on[data-k="none"]{background:var(--sub);border-color:var(--sub);}
.pill.on[data-k="both"]{background:var(--ok);border-color:var(--ok);}

#swap{
  background:#fff;color:#04060a;border:none;border-radius:9px;
  padding:16px 28px;font-size:1.02rem;font-weight:800;cursor:pointer;letter-spacing:.02em;
  box-shadow:0 0 0 1px rgba(255,255,255,.15),0 6px 24px rgba(0,0,0,.5);
}
#swap:active{transform:translateY(1px);}
#swap small{display:block;font-size:.6rem;font-weight:600;opacity:.55;letter-spacing:.12em;margin-top:3px;}

/* ===== タイムライン ===== */
#timeline{display:flex;align-items:center;gap:12px;flex:1 1 320px;min-width:260px;}
#timeline input[type=range]{
  flex:1;-webkit-appearance:none;appearance:none;height:5px;border-radius:3px;
  background:#2b3340;outline:none;cursor:pointer;
}
#timeline input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:15px;height:15px;border-radius:50%;
  background:#fff;cursor:pointer;box-shadow:0 0 0 3px rgba(0,0,0,.5);
}
#timeline input[type=range]::-moz-range-thumb{
  width:15px;height:15px;border-radius:50%;background:#fff;border:none;cursor:pointer;
}
#playpause{min-width:56px;}
#offsetLabel{
  font-family:ui-monospace,monospace;font-size:.84rem;font-weight:700;
  min-width:96px;text-align:right;
}
#offsetLabel.live{color:var(--live);}

/* ===== 音量 ===== */
#volWrap{display:flex;align-items:center;gap:9px;}
#vol{
  -webkit-appearance:none;appearance:none;width:110px;height:5px;border-radius:3px;
  background:#2b3340;outline:none;cursor:pointer;
}
#vol::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:#fff;cursor:pointer;box-shadow:0 0 0 3px rgba(0,0,0,.5);
}
#vol::-moz-range-thumb{
  width:14px;height:14px;border-radius:50%;background:#fff;border:none;cursor:pointer;
}
#volLabel{
  font-family:ui-monospace,monospace;font-size:.82rem;font-weight:700;
  min-width:42px;text-align:right;
}
#volLabel.muted{color:var(--sub);}

.trim{display:flex;align-items:center;gap:3px;font-size:.7rem;color:var(--sub);}
.trim button{
  background:rgba(255,255,255,.05);border:1px solid var(--line);color:var(--sub);
  border-radius:4px;width:20px;height:20px;cursor:pointer;font-size:.72rem;line-height:1;padding:0;
}
.trim button:hover{border-color:var(--text);color:var(--text);}
.trim var{font-style:normal;font-family:ui-monospace,monospace;min-width:34px;text-align:center;color:var(--text);}

/* ===== 音声インジケーター ===== */
#nowAudio{
  position:fixed;top:14px;right:16px;z-index:19;
  display:flex;align-items:center;gap:9px;
  background:rgba(7,9,12,.82);border:1px solid var(--line);border-radius:8px;
  padding:9px 14px;font-size:.84rem;font-weight:700;letter-spacing:.03em;transition:opacity .25s;
}
#nowAudio.hidden{opacity:0;}
#nowAudio .dot{width:9px;height:9px;border-radius:50%;background:var(--sub);}
#nowAudio .dot.live{animation:pulse 1.6s infinite;}
@keyframes pulse{0%,100%{opacity:1;}50%{opacity:.35;}}

/* ===== 診断 ===== */
#diag{
  position:fixed;top:14px;left:16px;z-index:19;display:none;
  background:rgba(7,9,12,.9);border:1px solid var(--line);border-radius:8px;
  padding:10px 14px;font-family:ui-monospace,monospace;font-size:.73rem;
  line-height:1.7;color:var(--sub);white-space:pre;
}
#diag.show{display:block;}
#diag b{color:var(--a);font-weight:700;}
#diag em{color:var(--b);font-style:normal;}

/* ===== ヘルプ ===== */
#help{
  position:fixed;inset:0;z-index:23;display:none;
  background:rgba(4,6,10,.93);padding:30px;overflow-y:auto;
}
#help.show{display:flex;align-items:center;justify-content:center;}
#help .inner{max-width:560px;width:100%;}
#help h3{margin:0 0 18px;font-size:1.1rem;font-weight:800;}
#help table{width:100%;border-collapse:collapse;font-size:.85rem;}
#help th{
  text-align:left;padding:16px 0 6px;font-size:.65rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--sub);font-weight:600;
}
#help td{padding:5px 0;color:var(--sub);border-bottom:1px solid rgba(255,255,255,.05);}
#help td:first-child{
  width:130px;color:var(--text);font-family:ui-monospace,monospace;font-weight:700;font-size:.82rem;
}
#help .close{
  position:fixed;top:14px;right:16px;
  background:transparent;border:1px solid var(--line);color:var(--sub);
  border-radius:6px;padding:8px 16px;font-weight:700;cursor:pointer;font-size:.83rem;
}
#help .close:hover{border-color:var(--text);color:var(--text);}
#help .contact{
  margin-top:24px;padding-top:16px;border-top:1px solid rgba(255,255,255,.07);
  font-size:.76rem;color:var(--sub);line-height:1.8;
}
#help .contact a{color:var(--a);text-decoration:none;font-weight:700;}
#help .contact a:hover{text-decoration:underline;}

#hint{
  position:fixed;bottom:0;left:0;right:0;z-index:18;text-align:center;
  padding:5px;font-size:.7rem;color:#3d4552;pointer-events:none;
}
#focusWarn{
  position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);z-index:25;
  background:rgba(229,72,77,.95);color:#fff;padding:14px 24px;border-radius:8px;
  font-size:.9rem;font-weight:700;display:none;cursor:pointer;
  box-shadow:0 8px 32px rgba(0,0,0,.6);
}
#focusWarn.show{display:block;}