:root{
  --bg:#16171a; --surface:#1e2024; --surface-2:#25282e; --line:#32363d;
  --text:#e8eaed; --text-2:#9aa0a6; --text-3:#6b7280;
  --accent:#4c8dff; --accent-soft:rgba(76,141,255,.14);
  --green:#3ddc97; --red:#ff6b6b; --amber:#ffb84d; --radius:14px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; background:var(--bg); color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  font-size:15px; line-height:1.6; -webkit-font-smoothing:antialiased;
}
.hidden{display:none !important}
.app{max-width:560px;margin:0 auto;padding:20px 18px 40px;min-height:100%;display:flex;flex-direction:column}

.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:6px 2px 16px}
.brand{display:flex;align-items:center;gap:9px}
.brand-name{font-size:16px;font-weight:600;letter-spacing:.04em}
.dot{width:9px;height:9px;border-radius:50%;background:var(--text-3);flex:0 0 auto}
.dot.on{background:var(--green)}
.dot.warn{background:var(--amber)}
.room-badge{display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:5px 6px 5px 12px;font-size:13px}
.room-label{color:var(--text-3)}
.room-id{font-family:ui-monospace,Menlo,Consolas,monospace;font-weight:600;letter-spacing:.06em}
.room-count{font-size:11.5px;color:var(--text-2);background:var(--surface-2);border:1px solid var(--line);border-radius:999px;padding:1px 8px;white-space:nowrap}

.notice{
  border-radius:10px;padding:11px 14px;font-size:13px;margin-bottom:14px;
  background:rgba(255,184,77,.1);border:1px solid rgba(255,184,77,.3);color:var(--amber);
}
.notice.error{background:rgba(255,107,107,.1);border-color:rgba(255,107,107,.3);color:var(--red)}
.notice.ok{background:rgba(61,220,151,.1);border-color:rgba(61,220,151,.3);color:var(--green)}

.view{display:block}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px}
.card h1{font-size:19px;font-weight:600;margin:0 0 6px;letter-spacing:-.01em}
.sub{color:var(--text-2);font-size:13.5px;margin:0 0 22px}

/* ---------- 校验 / 进入 ---------- */
.gate{text-align:center;padding:34px 24px 26px}
.gate-icon{
  width:58px;height:58px;margin:0 auto 16px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:26px;
  background:var(--accent-soft);color:var(--accent);
}
.gate-icon.bad{background:rgba(255,107,107,.12);color:var(--red)}
.gate-icon.good{background:rgba(61,220,151,.13);color:var(--green)}
.gate .sub{margin-bottom:18px}
.gate-room{
  background:var(--surface-2);border:1px solid var(--line);border-radius:12px;
  padding:16px;margin-bottom:18px;
}
.gate-room-name{font-size:16px;font-weight:600;margin-bottom:6px}
.gate-room-code{font-size:13px;color:var(--text-2)}
.gate-room-code b{
  font-family:ui-monospace,Menlo,Consolas,monospace;color:var(--accent);
  font-size:17px;letter-spacing:.1em;margin-left:6px;
}
.field{display:block;margin-bottom:16px;text-align:left}
.field-label{display:block;font-size:12.5px;color:var(--text-2);margin-bottom:7px}
input,select{
  width:100%;background:var(--surface-2);border:1px solid var(--line);color:var(--text);
  border-radius:10px;padding:11px 13px;font-size:15px;font-family:inherit;outline:none;
}
input:focus,select:focus{border-color:var(--accent);background:#2a2e35}
#roomInput{
  text-align:center;font-size:24px;letter-spacing:.3em;font-family:ui-monospace,Menlo,Consolas,monospace;
  font-weight:600;padding:12px;
}
#roomInput.err{border-color:var(--red);animation:shake .3s}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

.primary-btn{
  width:100%;background:var(--accent);color:#fff;border:0;border-radius:11px;
  padding:13px;font-size:15px;font-weight:600;cursor:pointer;font-family:inherit;margin-top:4px;
}
.primary-btn:hover{background:#3d7ef0}
.primary-btn:disabled{background:#3a3f47;opacity:.6;cursor:not-allowed}
.gate-hint{margin-top:16px;font-size:12.5px;color:var(--text-3);line-height:1.7}

/* ---------- 通话 ---------- */
.call-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px}
.call-head h1{margin:0}
.state-chip{font-size:12px;padding:4px 10px;border-radius:999px;background:var(--surface-2);color:var(--text-2);border:1px solid var(--line);white-space:nowrap}
.state-chip.ok{background:rgba(61,220,151,.12);color:var(--green);border-color:rgba(61,220,151,.3)}
.state-chip.bad{background:rgba(255,107,107,.12);color:var(--red);border-color:rgba(255,107,107,.3)}

.stage{display:flex;flex-direction:column;gap:10px;margin-bottom:20px}
.participant{display:flex;align-items:center;gap:12px;background:var(--surface-2);border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.avatar{width:40px;height:40px;border-radius:50%;flex:0 0 auto;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;background:var(--accent-soft);color:var(--accent)}
.avatar.me{background:rgba(61,220,151,.14);color:var(--green)}
.p-body{flex:1;min-width:0}
.p-name{font-size:14px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.meter{height:4px;background:#33383f;border-radius:3px;margin-top:7px;overflow:hidden}
.meter i{display:block;height:100%;width:0%;background:var(--green);border-radius:3px;transition:width .08s linear}
.kbps{font-size:11.5px;color:var(--text-3);margin-top:5px;line-height:1.5}
.kbps.ok{color:var(--green)}
.kbps.warn{color:var(--amber)}
.peer-list{display:flex;flex-direction:column;gap:10px}
.empty{text-align:center;color:var(--text-3);font-size:13px;padding:16px;border:1px dashed var(--line);border-radius:12px}

.play-hint{display:block;width:100%;margin-bottom:14px;padding:12px 14px;background:rgba(255,184,77,.12);border:1px solid rgba(255,184,77,.45);color:var(--amber);border-radius:10px;font-size:13.5px;cursor:pointer;font-family:inherit;text-align:left}
.play-hint:hover{background:rgba(255,184,77,.2)}

.controls{display:flex;gap:10px;margin-bottom:18px}
.ctrl{flex:1;display:flex;flex-direction:column;align-items:center;gap:5px;background:var(--surface-2);border:1px solid var(--line);color:var(--text);border-radius:12px;padding:12px 6px;cursor:pointer;font-family:inherit;font-size:12.5px}
.ctrl:hover{border-color:#454a52}
.ctrl-icon{font-size:15px;line-height:1}
.ctrl.active{background:rgba(255,107,107,.12);border-color:rgba(255,107,107,.35);color:var(--red)}
.ctrl.danger{color:var(--red)}

.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;border-top:1px dashed var(--line);padding-top:16px}
.stat{display:flex;flex-direction:column;gap:3px;align-items:center}
.stat-label{font-size:11px;color:var(--text-3)}
.stat-value{font-size:13px;font-weight:600;font-variant-numeric:tabular-nums}

.foot{margin-top:auto;padding-top:22px;text-align:center;font-size:11.5px;color:var(--text-3);line-height:1.6}
.toast{position:absolute;left:50%;bottom:28px;transform:translateX(-50%);background:#2c3037;border:1px solid var(--line);color:var(--text);padding:10px 18px;border-radius:999px;font-size:13px;box-shadow:0 8px 24px rgba(0,0,0,.35)}

@media (max-width:420px){
  .card{padding:22px 18px}
  .stats{grid-template-columns:repeat(2,1fr);gap:12px}
  .room-badge{font-size:12px}
}