/* ═════════════════════════════════════════════════════════════════════════
   app.css — research avatar demo
   Dark by default, light theme honoured via prefers-color-scheme.
   Focus is visible on every interactive element in both themes: `outline` is
   never removed without a replacement.
   ═════════════════════════════════════════════════════════════════════════ */

:root {
  --bg: #080c18;
  --bg-2: #0d1426;
  --panel: #111a2e;
  --panel-2: #16203a;
  --line: #243354;
  --line-2: #2e4068;
  --ink: #eaf0ff;
  --ink-dim: #9aaccd;
  --ink-faint: #6b7fa3;
  --accent: #5b8cff;
  --accent-2: #46e6c8;
  --warn: #ffb347;
  --danger: #ff6b7d;
  --focus: #7fd3ff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 10px 34px rgba(0, 0, 0, .45);
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Inter, Roboto, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #eef2fa;
    --bg-2: #e3e9f6;
    --panel: #ffffff;
    --panel-2: #f4f7fd;
    --line: #ccd7ea;
    --line-2: #b4c3dd;
    --ink: #121a2c;
    --ink-dim: #4a5a78;
    --ink-faint: #74849f;
    --accent: #2c5fe0;
    --accent-2: #0d9e85;
    --focus: #0a58ca;
    --shadow: 0 8px 26px rgba(20, 35, 70, .14);
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1100px 620px at 18% -8%, #1a2850 0%, transparent 62%),
    radial-gradient(760px 520px at 100% 108%, #142a44 0%, transparent 60%),
    var(--bg);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto auto;
  min-height: 100dvh;
}

@media (prefers-color-scheme: light) {
  body {
    background:
      radial-gradient(1100px 620px at 18% -8%, #d7e3fb 0%, transparent 62%),
      radial-gradient(760px 520px at 100% 108%, #d3eef0 0%, transparent 60%),
      var(--bg);
  }
}

/* ── Focus: one consistent, high-contrast ring everywhere ──────────── */
:where(a, button, input, textarea, [tabindex], summary):focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
/* Keep the ring for mouse users on the scrollable log too — it tells you
   where PageUp/PageDown will act. */
.transcript:focus { outline: 3px solid var(--focus); outline-offset: 2px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 50%; top: -60px; transform: translateX(-50%);
  z-index: 60; padding: .6rem 1rem; background: var(--accent); color: #fff;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm); font-weight: 600;
  text-decoration: none; transition: top .15s;
}
.skip-link:focus { top: 0; }

/* ── Top bar ───────────────────────────────────────────────────────── */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .8rem clamp(.8rem, 2.5vw, 1.6rem);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 72%, transparent);
  backdrop-filter: blur(10px);
}
.brand { display: flex; align-items: baseline; gap: .6rem; flex-wrap: wrap; }
.brand h1 { margin: 0; font-size: 1.12rem; letter-spacing: -.01em; }
.brand-dot {
  width: 10px; height: 10px; border-radius: 50%; align-self: center;
  background: var(--accent-2); box-shadow: 0 0 12px var(--accent-2);
}
.brand-sub { margin: 0; font-size: .78rem; color: var(--ink-faint); }
.topbar-actions { display: flex; gap: .5rem; }

/* ── Buttons ───────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  font: inherit; font-weight: 600; font-size: .86rem;
  padding: .55rem .9rem; border-radius: var(--radius-sm);
  border: 1px solid var(--line-2); background: var(--panel-2);
  color: var(--ink); cursor: pointer;
  transition: background .14s, border-color .14s, transform .08s;
}
.btn:hover { background: var(--panel); border-color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .45; cursor: not-allowed; }
/* display:inline-flex above would otherwise beat the UA's [hidden] rule and
   leave Stop on screen permanently. */
.btn[hidden] { display: none; }
.btn-sm { padding: .38rem .6rem; font-size: .78rem; }
.btn-ghost { background: transparent; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 85%, #fff); }
.btn-stop { background: var(--danger); border-color: var(--danger); color: #2a0008; }
.btn[aria-pressed="true"] {
  background: color-mix(in srgb, var(--accent-2) 24%, var(--panel-2));
  border-color: var(--accent-2);
}
.btn-key {
  font: 600 .68rem/1 var(--mono); padding: .2rem .34rem; border-radius: 4px;
  border: 1px solid var(--line-2); background: color-mix(in srgb, var(--ink) 8%, transparent);
  color: var(--ink-dim);
}
/* On the filled buttons the chip sits on a saturated field, where --ink-dim
   has almost no contrast and reads as a solid block. */
.btn-primary .btn-key, .btn-stop .btn-key {
  color: #fff; border-color: rgba(255, 255, 255, .5);
  background: rgba(255, 255, 255, .16);
}
.btn-stop .btn-key { color: #2a0008; border-color: rgba(0, 0, 0, .35); background: rgba(0, 0, 0, .12); }

/* ── Layout ────────────────────────────────────────────────────────── */
.layout {
  display: grid; gap: clamp(.7rem, 1.6vw, 1.1rem);
  grid-template-columns: minmax(0, 1fr) 330px;
  padding: clamp(.7rem, 1.8vw, 1.1rem);
  min-height: 0;
}
@media (max-width: 920px) {
  .layout { grid-template-columns: 1fr; }
  body { grid-template-rows: auto auto auto auto auto; }
}

/* ── Stage ─────────────────────────────────────────────────────────── */
.stage { display: flex; flex-direction: column; gap: .6rem; min-width: 0; min-height: 0; }

.stage-canvas-wrap {
  position: relative; flex: 1; min-height: 340px;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(180deg, #0a1326 0%, #0f1a30 100%);
  overflow: hidden; box-shadow: var(--shadow);
}
@media (prefers-color-scheme: light) {
  .stage-canvas-wrap { background: linear-gradient(180deg, #0f1a30 0%, #16233d 100%); }
}
#stage { display: block; width: 100%; height: 100%; }

.stage-overlay {
  position: absolute; inset: .7rem .7rem auto .7rem;
  display: flex; align-items: center; gap: .6rem; pointer-events: none;
}

.chip {
  margin: 0; display: inline-flex; align-items: center; gap: .45rem;
  padding: .35rem .7rem; border-radius: 999px; font-size: .78rem; font-weight: 600;
  background: rgba(8, 14, 30, .78); border: 1px solid rgba(255, 255, 255, .22);
  /* The stage is dark in both themes, so this text must not follow --ink —
     in light mode that would put near-black on near-black. */
  color: #eef3ff; backdrop-filter: blur(6px);
}
.chip-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ink-faint); }
.chip[data-state="idle"]      .chip-dot { background: var(--ink-faint); }
.chip[data-state="listening"] .chip-dot { background: var(--accent-2); animation: pulse 1.1s infinite; }
.chip[data-state="thinking"]  .chip-dot { background: var(--warn); animation: pulse .7s infinite; }
.chip[data-state="speaking"]  .chip-dot { background: var(--accent); animation: pulse .9s infinite; }
.chip[data-state="error"]     .chip-dot { background: var(--danger); }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: .35; transform: scale(.78); } }
@media (prefers-reduced-motion: reduce) { .chip-dot { animation: none !important; } }

.meter {
  flex: 0 1 110px; height: 5px; border-radius: 3px; overflow: hidden;
  background: rgba(255, 255, 255, .14); opacity: 0; transition: opacity .2s;
}
.meter.on { opacity: 1; }
.meter > span {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  transition: width .06s linear;
}

.caption-wrap {
  position: absolute; inset: auto 0 0 0; padding: .9rem;
  background: linear-gradient(transparent, rgba(5, 9, 20, .9) 55%);
  pointer-events: none;
}
.caption {
  margin: 0 auto; max-width: 54ch; min-height: 1.4em;
  text-align: center; font-size: clamp(.95rem, 1.5vw, 1.1rem); line-height: 1.45;
  color: #f2f6ff; text-wrap: balance;
}
.caption:empty::after { content: ""; }

/* ── Cue strip ─────────────────────────────────────────────────────── */
.cue-strip {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .5rem;
}
@media (max-width: 560px) { .cue-strip { grid-template-columns: repeat(2, 1fr); } }
.cue {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: .5rem .65rem; min-width: 0;
}
.cue-k {
  display: block; font-size: .67rem; text-transform: uppercase;
  letter-spacing: .07em; color: var(--ink-faint); margin-bottom: .15rem;
}
.cue-v {
  display: block; font-size: .92rem; font-weight: 650;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.cue-src .cue-v { font: 500 .78rem/1.3 var(--mono); color: var(--ink-dim); }

/* ── Side panel ────────────────────────────────────────────────────── */
.side {
  display: flex; flex-direction: column; gap: .5rem; min-width: 0;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: .9rem; box-shadow: var(--shadow);
  max-height: calc(100dvh - 190px); overflow-y: auto;  /* never clip content */
}
@media (max-width: 920px) { .side { max-height: none; } }

.side-h {
  margin: .5rem 0 .1rem; font-size: .7rem; text-transform: uppercase;
  letter-spacing: .09em; color: var(--ink-faint);
  display: flex; align-items: center; gap: .4rem;
}
.side-h:first-child { margin-top: 0; }

.info {
  width: 17px; height: 17px; padding: 0; border-radius: 50%; flex: none;
  border: 1px solid var(--line-2); background: var(--panel-2);
  color: var(--ink-dim); font: 700 .66rem/1 var(--mono); cursor: pointer;
}
.info:hover { border-color: var(--accent); color: var(--ink); }
.info-body {
  margin: 0 0 .3rem; font-size: .78rem; line-height: 1.5; color: var(--ink-dim);
  border-left: 2px solid var(--accent); padding-left: .6rem;
}

.transcript {
  min-height: 130px; max-height: 240px; overflow-y: auto;
  display: flex; flex-direction: column; gap: .45rem;
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: .6rem;
  scroll-behavior: smooth; overscroll-behavior: contain;
}
.turn { margin: 0; font-size: .85rem; line-height: 1.5; }
.turn b {
  display: block; font-size: .66rem; text-transform: uppercase;
  letter-spacing: .08em; color: var(--ink-faint); margin-bottom: .1rem;
}
.turn-you b { color: var(--accent-2); }
.turn-nova b { color: var(--accent); }
.hint { margin: 0; font-size: .8rem; color: var(--ink-faint); line-height: 1.5; }

kbd {
  font: 600 .72rem/1 var(--mono); padding: .18rem .34rem; border-radius: 4px;
  border: 1px solid var(--line-2); background: var(--panel-2); color: var(--ink-dim);
  white-space: nowrap;
}

/* ── Fields / combobox ─────────────────────────────────────────────── */
.field { display: block; min-width: 0; }
.fieldset { border: 0; padding: 0; margin: 0; }
.cb-label {
  display: block; font-size: .72rem; font-weight: 600; color: var(--ink-dim);
  margin-bottom: .22rem; padding: 0;
}
.cb-shell { position: relative; }
.cb-input, .composer textarea {
  width: 100%; font: inherit; font-size: .88rem; color: var(--ink);
  background: var(--bg-2); border: 1px solid var(--line-2);
  border-radius: var(--radius-sm); padding: .5rem 2rem .5rem .6rem;
}
.cb-input::placeholder, .composer textarea::placeholder { color: var(--ink-faint); }
.cb-toggle {
  position: absolute; right: .3rem; top: 50%; transform: translateY(-50%);
  width: 24px; height: 24px; display: grid; place-items: center;
  border: 0; background: transparent; color: var(--ink-faint); cursor: pointer;
}
.cb-list {
  position: absolute; z-index: 40; top: calc(100% + 4px); left: 0; right: 0;
  margin: 0; padding: .25rem; list-style: none;
  max-height: 232px; overflow-y: auto; overscroll-behavior: contain;
  background: var(--panel-2); border: 1px solid var(--line-2);
  border-radius: var(--radius-sm); box-shadow: var(--shadow);
}
.cb-option {
  display: flex; align-items: baseline; justify-content: space-between; gap: .5rem;
  padding: .36rem .5rem; border-radius: 6px; font-size: .85rem; cursor: pointer;
}
.cb-option.is-active { background: var(--accent); color: #fff; }
.cb-option[aria-selected="true"] .cb-opt-label::after { content: " ✓"; color: var(--accent-2); }
.cb-option.is-active[aria-selected="true"] .cb-opt-label::after { color: #fff; }
.cb-opt-hint { font-size: .72rem; color: var(--ink-faint); flex: none; }
.cb-option.is-active .cb-opt-hint { color: rgba(255, 255, 255, .8); }
.cb-empty { padding: .5rem; font-size: .82rem; color: var(--ink-faint); }

.radio-row { display: flex; flex-direction: column; gap: .3rem; }
.radio { display: flex; align-items: flex-start; gap: .45rem; font-size: .82rem; cursor: pointer; }
.radio input { margin: .22rem 0 0; accent-color: var(--accent); flex: none; }
.radio em { display: block; font-size: .72rem; color: var(--ink-faint); font-style: normal; }
.radio input:disabled + span { opacity: .45; }

/* ── Chipsets (rig test) ───────────────────────────────────────────── */
.chipset { display: flex; flex-wrap: wrap; gap: .3rem; }
.chipset button {
  font: 600 .76rem/1 var(--sans); padding: .38rem .6rem;
  border-radius: 999px; border: 1px solid var(--line-2);
  background: var(--panel-2); color: var(--ink-dim); cursor: pointer;
}
.chipset button:hover { border-color: var(--accent); color: var(--ink); }
.chipset button[aria-pressed="true"] {
  background: var(--accent); border-color: var(--accent); color: #fff;
}

/* ── Composer ──────────────────────────────────────────────────────── */
.composer {
  display: flex; align-items: flex-end; gap: .5rem;
  padding: .7rem clamp(.7rem, 1.8vw, 1.1rem);
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 80%, transparent);
  backdrop-filter: blur(10px);
}
.composer textarea {
  flex: 1; resize: none; line-height: 1.5; min-height: 42px;
  max-height: 40dvh;        /* auto-grow cap, then scroll inside */
  overflow-y: auto; padding: .6rem .7rem;
}
.btn-mic { flex: none; }
.btn-mic[aria-pressed="true"] {
  background: var(--accent-2); border-color: var(--accent-2); color: #04231d;
}
@media (max-width: 560px) {
  .composer { flex-wrap: wrap; }
  .composer textarea { order: -1; flex-basis: 100%; }
}

.status {
  margin: 0; padding: 0 clamp(.7rem, 1.8vw, 1.1rem) .5rem;
  font-size: .78rem; color: var(--ink-faint); min-height: 1.1em;
}
.status[data-kind="error"] { color: var(--danger); font-weight: 600; }
.status[data-kind="warn"] { color: var(--warn); }

/* ── Help panel: a slide-in region, not a modal dialog ─────────────── */
.help-panel {
  position: fixed; z-index: 50; right: clamp(.6rem, 2vw, 1.2rem);
  bottom: clamp(.6rem, 2vw, 1.2rem); width: min(400px, calc(100vw - 1.6rem));
  max-height: min(74dvh, 640px); overflow-y: auto; overscroll-behavior: contain;
  background: var(--panel); border: 1px solid var(--line-2);
  border-radius: var(--radius); box-shadow: 0 18px 50px rgba(0, 0, 0, .5);
  padding: .9rem 1rem 1rem;
  animation: slide-in .18s ease-out;
}
@keyframes slide-in { from { opacity: 0; transform: translateY(10px); } }
@media (prefers-reduced-motion: reduce) { .help-panel { animation: none; } }
.help-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.help-head h2 { margin: 0; font-size: 1rem; }
.help-list {
  display: grid; grid-template-columns: auto 1fr; gap: .4rem .8rem;
  margin: .8rem 0 0; font-size: .83rem; align-items: baseline;
}
.help-list dt { display: flex; gap: .2rem; align-items: center; flex-wrap: wrap; }
.help-list dd { margin: 0; color: var(--ink-dim); line-height: 1.45; }
.held { font-size: .68rem; color: var(--ink-faint); }
.help-note {
  margin: .9rem 0 0; padding-top: .7rem; border-top: 1px solid var(--line);
  font-size: .78rem; line-height: 1.55; color: var(--ink-faint);
}

/* ── Footer ────────────────────────────────────────────────────────── */
.foot {
  padding: .3rem clamp(.7rem, 1.8vw, 1.1rem) .9rem;
  font-size: .72rem; color: var(--ink-faint);
}
.foot p { margin: 0; }
.foot a { color: var(--ink-dim); }