:root {
  --bg: #0b0d12;
  --panel: #151925;
  --text: #e9ecf3;
  --muted: #8a93a8;
  --accent: #7c9cff;
  --ok: #3ddc97;
  --warn: #ffb547;
  --err: #ff6b6b;
  --ring: rgba(124, 156, 255, .55);
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text); font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.demo-banner { position: sticky; top: 0; z-index: 10; width: 100%; padding: 6px 12px; text-align: center; font-size: 12px; letter-spacing: .3px; color: #0b0d12; background: var(--warn); font-weight: 600; }
.stage { min-height: 100%; display: flex; flex-direction: column; align-items: center; gap: 18px; padding: max(12px, env(safe-area-inset-top)) 16px 24px; }
.topbar { width: 100%; max-width: 560px; display: flex; justify-content: space-between; align-items: center; }
.brand { font-weight: 600; letter-spacing: .3px; }
.brand small { color: var(--muted); font-weight: 400; margin-left: 6px; }
.pill { font-size: 12px; padding: 4px 10px; border-radius: 999px; background: var(--panel); color: var(--muted); }
.pill-ok { color: var(--ok); }
.pill-live { color: var(--accent); }
.pill-warn { color: var(--warn); }
.pill-err { color: var(--err); }

.avatar-wrap { position: relative; width: min(92vw, 480px); aspect-ratio: 1; border-radius: 28px; overflow: hidden; background: var(--panel); box-shadow: 0 30px 80px rgba(0,0,0,.5); }
.avatar { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.avatar.still { animation: breathe 6s ease-in-out infinite; }
.avatar.idle { opacity: 0; transition: opacity .6s ease; }
.avatar.idle.ready { opacity: 1; }
.avatar.video { opacity: 0; transition: opacity .45s ease; background: transparent; }
.avatar.video.active { opacity: 1; }
.hidden { display: none !important; }
@keyframes breathe { 0%,100% { transform: scale(1); } 50% { transform: scale(1.015); } }

.ring { position: absolute; inset: 0; border-radius: 28px; pointer-events: none; box-shadow: inset 0 0 0 0 var(--ring); transition: box-shadow .15s ease; }
.avatar-wrap.listening .ring { box-shadow: inset 0 0 0 4px var(--ring); }
.avatar-wrap.user-speaking .ring { box-shadow: inset 0 0 0 7px var(--accent); }
.avatar-wrap.thinking .ring { box-shadow: inset 0 0 0 4px var(--warn); }

.start-btn { position: absolute; left: 50%; bottom: 22px; transform: translateX(-50%); padding: 14px 22px; border: 0; border-radius: 999px; background: var(--accent); color: #0b0d12; font-weight: 700; font-size: 16px; cursor: pointer; box-shadow: 0 10px 30px rgba(124,156,255,.35); }
.start-btn:active { transform: translateX(-50%) scale(.98); }

.controls { display: flex; gap: 14px; }
.icon-btn { width: 48px; height: 48px; border-radius: 50%; border: 1px solid #262c3d; background: var(--panel); color: var(--muted); display: grid; place-items: center; cursor: pointer; }
.icon-btn[aria-pressed="true"] { color: var(--accent); border-color: var(--accent); }
.icon-btn.muted { color: var(--err); border-color: var(--err); }

.transcript { width: 100%; max-width: 560px; display: flex; flex-direction: column; gap: 10px; max-height: 40vh; overflow-y: auto; padding: 4px 2px; }
.msg { padding: 10px 14px; border-radius: 16px; max-width: 88%; white-space: pre-wrap; word-break: break-word; }
.msg.user { align-self: flex-end; background: #22304f; }
.msg.user.live { opacity: .7; font-style: italic; border: 1px dashed #3b4a72; }
.msg.assistant { align-self: flex-start; background: var(--panel); }
.msg .meta { display: block; margin-top: 4px; font-size: 11px; color: var(--muted); }
.notice { max-width: 560px; text-align: center; color: var(--muted); font-size: 14px; }
.notice.error { color: var(--err); }