:root{
  --bg:#07070d; --fg:#f4f4f8; --muted:#8a8aa0;
  --a:#6d5efc; --b:#16d6c4; --warn:#ffb454; --err:#ff5470;
  --top:#10243a; --bottom:#1a1230;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent;}
html,body{height:100%;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  background:var(--bg);color:var(--fg);min-height:100dvh;overflow:hidden;
  -webkit-user-select:none;user-select:none;
}
.screen{position:fixed;inset:0;display:none;flex-direction:column;}
.screen.active{display:flex;}
button{font-family:inherit;cursor:pointer;border:none;}
.hidden{display:none!important;}

/* ---------- HOME ---------- */
#home{
  align-items:center;justify-content:center;padding:28px;
  background-image:radial-gradient(120% 80% at 18% 0%,rgba(109,94,252,.20),transparent 60%),
                   radial-gradient(120% 80% at 90% 100%,rgba(22,214,196,.16),transparent 55%);
}
.home-inner{width:100%;max-width:430px;text-align:center;}
.logo{font-weight:800;font-size:12px;letter-spacing:.34em;color:var(--muted);text-transform:uppercase;margin-bottom:22px;}
h1{font-size:clamp(32px,8.5vw,46px);line-height:1.05;font-weight:800;letter-spacing:-.02em;
   background:linear-gradient(110deg,var(--a),var(--b));-webkit-background-clip:text;background-clip:text;color:transparent;}
.tag{color:var(--muted);margin-top:14px;font-size:15px;line-height:1.5;}
.lang-pick{margin-top:30px;text-align:left;}
.lang-pick label{font-size:13px;color:var(--muted);display:block;margin-bottom:8px;}
select{width:100%;padding:15px 16px;border-radius:14px;background:#13131f;color:var(--fg);
  border:1px solid rgba(255,255,255,.1);font-size:16px;appearance:none;}
.actions{margin-top:24px;display:flex;flex-direction:column;gap:12px;}
.btn{padding:17px;border-radius:16px;font-size:17px;font-weight:700;color:#fff;
  background:linear-gradient(110deg,var(--a),#8a6cff);box-shadow:0 8px 30px rgba(109,94,252,.35);transition:transform .15s;}
.btn:active{transform:scale(.97);}
.btn.ghost{background:#13131f;color:var(--fg);border:1px solid rgba(255,255,255,.12);box-shadow:none;}
.join-row{display:flex;gap:10px;}
.join-row input{flex:1;padding:16px;border-radius:14px;background:#13131f;color:var(--fg);
  border:1px solid rgba(255,255,255,.1);font-size:22px;text-align:center;letter-spacing:.3em;font-weight:700;}

/* ---------- WAITING (host) ---------- */
#waiting{align-items:center;justify-content:center;padding:28px;text-align:center;}
.code-big{font-size:clamp(56px,18vw,96px);font-weight:800;letter-spacing:.12em;
  background:linear-gradient(110deg,var(--a),var(--b));-webkit-background-clip:text;background-clip:text;color:transparent;}
.qr-card{margin:26px auto 0;width:220px;height:220px;background:#fff;border-radius:22px;display:grid;place-items:center;
  box-shadow:0 12px 50px rgba(0,0,0,.5);}
.qr-card canvas{border-radius:10px;}
.waiting-hint{color:var(--muted);margin-top:26px;font-size:15px;display:flex;align-items:center;gap:10px;justify-content:center;}
.spin{width:16px;height:16px;border:2px solid rgba(255,255,255,.2);border-top-color:var(--b);border-radius:50%;animation:spin 1s linear infinite;}
@keyframes spin{to{transform:rotate(360deg);}}
.share-link{margin-top:18px;font-size:13px;color:var(--a);word-break:break-all;}

/* ---------- ROOM (split screen) ---------- */
#room{flex-direction:column;}
.zone{flex:1;position:relative;display:flex;flex-direction:column;justify-content:center;
  padding:22px 22px calc(22px + env(safe-area-inset-bottom));overflow:hidden;transition:flex .5s cubic-bezier(.7,0,.2,1);}
.zone.top{background:linear-gradient(160deg,var(--top),#0a1626);}
.zone.bottom{background:linear-gradient(160deg,var(--bottom),#0d0820);padding-top:calc(22px + env(safe-area-inset-top));}
.divider{height:0;}
.split-line{position:absolute;left:0;right:0;top:50%;height:2px;
  background:linear-gradient(90deg,transparent,var(--a),var(--b),transparent);opacity:.6;transform:translateY(-1px);z-index:5;}

.zhead{position:absolute;top:14px;left:22px;right:22px;display:flex;align-items:center;gap:10px;font-size:14px;color:var(--muted);}
.zone.bottom .zhead{top:auto;bottom:14px;}
.flag{font-size:22px;}
.who{font-weight:600;color:var(--fg);}
.speaking-dot{width:9px;height:9px;border-radius:50%;background:#3a3a4a;transition:.2s;margin-left:auto;}
.speaking-dot.on{background:var(--b);box-shadow:0 0 14px var(--b);animation:pulse 1s ease-in-out infinite;}
@keyframes pulse{50%{transform:scale(1.5);}}

.prep{display:inline-flex;align-items:center;gap:8px;align-self:flex-start;margin-bottom:14px;
  padding:7px 14px;border-radius:999px;font-size:14px;font-weight:600;color:var(--b);
  background:rgba(22,214,196,.12);border:1px solid rgba(22,214,196,.3);
  animation:prepGlow 1.4s ease-in-out infinite;}
#myPrep{color:var(--a);background:rgba(109,94,252,.14);border-color:rgba(109,94,252,.32);}
@keyframes prepGlow{50%{box-shadow:0 0 18px rgba(22,214,196,.4);}}
.prep-dots{display:inline-flex;gap:3px;}
.prep-dots i{width:5px;height:5px;border-radius:50%;background:currentColor;animation:prepDot 1s infinite;}
.prep-dots i:nth-child(2){animation-delay:.2s;} .prep-dots i:nth-child(3){animation-delay:.4s;}
@keyframes prepDot{0%,60%,100%{opacity:.3;transform:translateY(0);}30%{opacity:1;transform:translateY(-4px);}}

.caption{font-size:clamp(22px,6vw,32px);line-height:1.32;font-weight:600;max-height:46vh;overflow-y:auto;}
.caption:empty::after{content:attr(data-placeholder);color:var(--muted);font-weight:400;font-size:18px;}
.subcaption{margin-top:12px;font-size:15px;color:var(--muted);line-height:1.4;font-weight:400;}

/* mic visualizer (bottom) */
.bars{position:absolute;bottom:54px;left:0;right:0;display:flex;gap:4px;justify-content:center;align-items:flex-end;height:30px;opacity:.7;}
.bars i{width:4px;height:4px;border-radius:2px;background:var(--b);transition:height .08s;}

/* controls */
.controls{position:absolute;top:50%;right:16px;transform:translateY(-50%);display:flex;flex-direction:column;gap:12px;z-index:10;}
.ctrl{width:52px;height:52px;border-radius:50%;background:rgba(255,255,255,.08);backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,.12);display:grid;place-items:center;font-size:22px;color:#fff;}
.ctrl.danger{background:rgba(255,84,112,.9);}
.ctrl.muted{background:var(--warn);color:#000;}

/* headphone banner */
.banner{position:absolute;top:calc(50% + 16px);left:50%;transform:translateX(-50%);z-index:20;
  background:rgba(255,180,84,.95);color:#000;padding:10px 16px;border-radius:12px;font-size:13px;font-weight:600;
  display:flex;align-items:center;gap:8px;box-shadow:0 8px 30px rgba(0,0,0,.4);white-space:nowrap;}
.banner button{background:rgba(0,0,0,.15);border-radius:8px;padding:4px 8px;font-size:12px;font-weight:700;}

/* reveal animation */
#room.reveal .zone.top{animation:slideTop .6s cubic-bezier(.6,0,.2,1);}
#room.reveal .zone.bottom{animation:slideBottom .6s cubic-bezier(.6,0,.2,1);}
@keyframes slideTop{from{transform:translateY(-100%);}to{transform:translateY(0);}}
@keyframes slideBottom{from{transform:translateY(100%);}to{transform:translateY(0);}}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#13131f;color:var(--fg);
  padding:12px 20px;border-radius:12px;font-size:14px;border:1px solid rgba(255,255,255,.12);z-index:100;
  box-shadow:0 8px 30px rgba(0,0,0,.5);opacity:0;transition:opacity .3s;max-width:90vw;text-align:center;}
.toast.show{opacity:1;}
.status-line{position:fixed;top:calc(env(safe-area-inset-top) + 8px);left:50%;transform:translateX(-50%);
  font-size:12px;color:var(--muted);z-index:30;background:rgba(0,0,0,.4);padding:4px 12px;border-radius:999px;}