:root {
  --bg: #05080d;
  --panel: #0b121b;
  --line: #16324a;
  --text: #d6e6f2;
  --muted: #6f8aa0;
  --accent: #46c8ff;
  --accent-2: #9be7ff;
  --warn: #ffb547;
  --err: #ff6b6b;
  --level: 0; /* 0..1, set from JS by audio analyser */
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text);
  font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
main { max-width: 640px; margin: 0 auto; padding: max(16px, env(safe-area-inset-top)) 16px 32px; }

header { display: flex; justify-content: space-between; align-items: baseline; }
.brand { letter-spacing: .35em; font-weight: 600; color: var(--accent-2); }
.brand b { font-weight: inherit; }
.brand span { letter-spacing: .1em; color: var(--muted); font-weight: 400; font-size: 12px; }
header { gap: 12px; align-items: center; }
.brand { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.header-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.meta { color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; text-align: right; }
.icon-btn { width: 36px; height: 36px; padding: 0; background: var(--panel); color: var(--accent-2);
  border: 1px solid var(--line); border-radius: 10px; font-size: 18px; line-height: 1; cursor: pointer; }

.stage { display: flex; flex-direction: column; align-items: center; padding: 28px 0 12px; }

/* --- Orb ------------------------------------------------------------------ */
.orb { position: relative; width: 220px; height: 220px; border: 0; border-radius: 50%;
  background: transparent; cursor: pointer; -webkit-tap-highlight-color: transparent; }
.orb .ring, .orb .core { position: absolute; inset: 0; margin: auto; border-radius: 50%; }
.orb .ring { border: 1px solid var(--accent); opacity: .35; transition: transform .25s, opacity .25s; }
.orb .r1 { width: 100%; height: 100%; border-style: dashed; animation: spin 40s linear infinite; }
.orb .r2 { width: 80%; height: 80%; border-width: 2px; animation: spin 24s linear infinite reverse; }
.orb .r3 { width: 62%; height: 62%; opacity: .5; }
.orb .core { width: 42%; height: 42%;
  background: radial-gradient(circle, var(--accent-2) 0%, var(--accent) 35%, rgba(70,200,255,.15) 70%, transparent 72%);
  box-shadow: 0 0 calc(20px + 60px * var(--level)) rgba(70,200,255,.55);
  transform: scale(calc(1 + .35 * var(--level))); transition: transform .06s linear, box-shadow .06s linear; }

.orb.idle .core { filter: grayscale(.8) brightness(.55); }
.orb.connecting .r2 { animation-duration: 2s; opacity: .8; }
.orb.listening .r3 { animation: pulse 2.4s ease-in-out infinite; }
.orb.hearing .r3 { opacity: .9; transform: scale(1.06); }
.orb.thinking .r2 { animation-duration: 1.2s; opacity: .9; border-color: var(--accent-2); }
.orb.speaking .ring { opacity: .7; }
.orb.synthetic.speaking .core { animation: talk .45s ease-in-out infinite alternate; } /* iOS: no remote meter */
@keyframes talk { from { transform: scale(1.02); } to { transform: scale(1.22); } }
.orb.error .core { filter: hue-rotate(160deg) saturate(2); }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 50% { transform: scale(1.05); opacity: .8; } }

.status { margin-top: 18px; min-height: 22px; color: var(--accent-2); letter-spacing: .04em; text-align: center; }

.metrics { display: flex; gap: 22px; margin-top: 14px; }
.metrics div { text-align: center; }
.metrics label { display: block; font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.metrics b { font-variant-numeric: tabular-nums; font-weight: 500; }

.controls { display: flex; gap: 10px; margin-top: 18px; }
.controls button { background: var(--panel); color: var(--text); border: 1px solid var(--line);
  border-radius: 10px; padding: 9px 14px; font: inherit; }
.controls button:disabled { opacity: .4; }
.controls button.active { border-color: var(--warn); color: var(--warn); }

/* --- Settings ------------------------------------------------------------- */
.settings { width: min(440px, calc(100vw - 32px)); max-height: calc(100dvh - 32px); padding: 20px;
  background: var(--panel); color: var(--text); border: 1px solid var(--line); border-radius: 16px; }
.settings::backdrop { background: rgba(3, 6, 10, .75); }
.settings h2 { margin: 0 0 14px; font-size: 17px; font-weight: 600; color: var(--accent-2); }
.settings label { display: block; margin: 14px 0 5px; font-size: 13px; color: var(--muted); }
.settings input, .settings select { width: 100%; padding: 10px 12px; background: var(--bg); color: var(--text);
  border: 1px solid var(--line); border-radius: 10px; font: inherit; font-size: 16px; /* iOS: no zoom on focus */ }
.settings input:focus, .settings select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.settings .hint { margin: 8px 0 0; font-size: 12px; color: var(--muted); }
.settings a { color: var(--accent); }
.settings .notice { margin: 0 0 4px; padding: 8px 10px; border: 1px solid var(--warn); border-radius: 10px;
  color: var(--warn); font-size: 13px; }
.settings .actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 20px; }
.settings .spacer { flex: 1; }
.settings button { padding: 9px 14px; background: transparent; color: var(--text); border: 1px solid var(--line);
  border-radius: 10px; font: inherit; cursor: pointer; }
.settings button.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); font-weight: 600; }
.settings button.danger { color: var(--err); border-color: transparent; padding-inline: 0; }
.settings button[hidden] { display: none; }

/* --- Conversation log ------------------------------------------------------ */
.log { display: flex; flex-direction: column; gap: 8px; margin-top: 18px; }
.msg { padding: 9px 12px; border-radius: 12px; max-width: 88%; white-space: pre-wrap; }
.msg.user { align-self: flex-end; background: #12202e; }
.msg.assistant { align-self: flex-start; background: var(--panel); border: 1px solid var(--line); }
.msg.tool { align-self: center; font-size: 12px; color: var(--muted); background: transparent; border: 1px dashed var(--line); }
.msg.error { align-self: center; color: var(--err); border: 1px solid var(--err); background: transparent; }
.msg.warn { align-self: center; color: var(--warn); font-size: 12px; }
.msg .t { display: block; font-size: 10px; color: var(--muted); margin-top: 3px; }

.debug { margin-top: 20px; color: var(--muted); font-size: 12px; }
.debug pre { max-height: 260px; overflow: auto; background: #03060a; padding: 8px; border-radius: 8px; white-space: pre-wrap; }