:root {
  color-scheme: dark;
  --bg: #070b14;
  --surface: rgba(17, 24, 39, 0.86);
  --surface-2: #111827;
  --line: rgba(255,255,255,.09);
  --text: #f8fafc;
  --muted: #94a3b8;
  --accent: #7c5cff;
  --accent-2: #a78bfa;
  --good: #32d583;
  --danger: #ff6b6b;
  --shadow: 0 24px 70px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 15% 5%, rgba(124,92,255,.20), transparent 28rem),
    radial-gradient(circle at 100% 100%, rgba(50,213,131,.08), transparent 28rem),
    var(--bg);
  color: var(--text);
}
button, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }

.app-shell { width: min(1260px, calc(100% - 32px)); margin: 0 auto; padding: 34px 0 22px; }
.topbar { display: flex; justify-content: space-between; gap: 28px; align-items: flex-start; margin-bottom: 24px; }
.eyebrow { margin: 0 0 8px; font-size: .72rem; letter-spacing: .14em; font-weight: 800; color: var(--accent-2); }
h1 { margin: 0; font-size: clamp(1.8rem, 4vw, 3.25rem); line-height: 1.02; letter-spacing: -.045em; }
.subtitle { max-width: 790px; margin: 12px 0 0; color: var(--muted); line-height: 1.6; }
.privacy-pill { display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; border: 1px solid var(--line); background: rgba(255,255,255,.035); border-radius: 999px; padding: 10px 13px; font-size: .82rem; color: #dbe4ef; }
.privacy-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--good); box-shadow: 0 0 0 4px rgba(50,213,131,.1); }

.layout { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(340px, .78fr); gap: 20px; align-items: start; }
.camera-card, .panel-card { border: 1px solid var(--line); background: var(--surface); border-radius: 24px; box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.camera-card { padding: 14px; }
.camera-stage { position: relative; overflow: hidden; background: #020617; border-radius: 18px; aspect-ratio: 16/10; }
video, #overlay { position: absolute; inset: 0; width: 100%; height: 100%; }
video { object-fit: cover; transform: scaleX(-1); }
#overlay { pointer-events: none; transform: scaleX(-1); }
.camera-placeholder { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 7px; color: var(--muted); text-align: center; padding: 20px; background: radial-gradient(circle at center, rgba(124,92,255,.08), transparent 50%); }
.camera-placeholder strong { color: #e5e7eb; }
.face-icon { width: 68px; height: 68px; border-radius: 20px; display: grid; place-items: center; font-size: 2.7rem; color: var(--accent-2); border: 1px solid rgba(167,139,250,.25); background: rgba(124,92,255,.08); margin-bottom: 8px; }
.status-badge, .fps { position: absolute; z-index: 4; top: 14px; border: 1px solid rgba(255,255,255,.12); background: rgba(5,10,20,.72); backdrop-filter: blur(10px); border-radius: 999px; font-size: .78rem; }
.status-badge { left: 14px; display: inline-flex; align-items: center; gap: 7px; padding: 7px 10px; }
.fps { right: 14px; padding: 7px 10px; color: #cbd5e1; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #94a3b8; }
.status-badge[data-state="running"] .status-dot { background: var(--good); box-shadow: 0 0 0 4px rgba(50,213,131,.11); }
.status-badge[data-state="error"] .status-dot { background: var(--danger); }

.controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 14px 2px 1px; }
.button { border: 1px solid var(--line); border-radius: 12px; padding: 10px 15px; color: var(--text); background: rgba(255,255,255,.045); cursor: pointer; transition: .2s ease; }
.button:hover:not(:disabled) { transform: translateY(-1px); background: rgba(255,255,255,.075); }
.button:disabled { opacity: .45; cursor: not-allowed; }
.button.primary { border-color: transparent; background: linear-gradient(135deg, var(--accent), #6544ee); font-weight: 750; }
.button.compact { padding: 7px 10px; font-size: .78rem; }
.toggle { margin-left: auto; display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: .86rem; cursor: pointer; }
.toggle input { accent-color: var(--accent); }

.panel-card { padding: 22px; }
.panel-heading { display: flex; justify-content: space-between; gap: 15px; align-items: flex-start; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
h2 { margin: 0; font-size: 1.35rem; letter-spacing: -.02em; }
.face-count { border: 1px solid var(--line); border-radius: 999px; padding: 7px 10px; font-size: .78rem; color: #cbd5e1; background: rgba(255,255,255,.035); white-space: nowrap; }

.panel-tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin: 15px 0 4px; padding: 4px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.025); }
.tab-button { border: 0; border-radius: 10px; padding: 8px 7px; background: transparent; color: var(--muted); font-size: .78rem; cursor: pointer; }
.tab-button.active { color: #fff; background: rgba(124,92,255,.18); box-shadow: inset 0 0 0 1px rgba(167,139,250,.18); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.metrics { display: grid; gap: 17px; padding: 20px 0 18px; }
.metric-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 8px; color: #cbd5e1; font-size: .88rem; }
.metric-row strong { color: var(--text); font-variant-numeric: tabular-nums; }
.track { height: 7px; border-radius: 999px; background: rgba(255,255,255,.065); overflow: hidden; }
.bar { width: 0%; height: 100%; border-radius: inherit; background: linear-gradient(90deg, #6d5dfc, #a78bfa); transition: width 90ms linear; }
.signal-summary { padding: 16px; border-radius: 16px; border: 1px solid rgba(124,92,255,.18); background: rgba(124,92,255,.07); }
.summary-label { display: block; margin-bottom: 5px; color: var(--muted); font-size: .77rem; }
.signal-summary strong { display: block; font-size: 1.08rem; }
.signal-summary p { margin: 8px 0 0; color: #aab6c6; line-height: 1.45; font-size: .8rem; }

.readout-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; padding: 18px 0 4px; }
.readout-card { min-height: 102px; padding: 14px; border: 1px solid var(--line); border-radius: 15px; background: rgba(255,255,255,.025); display: flex; flex-direction: column; justify-content: center; }
.readout-card span { color: var(--muted); font-size: .76rem; margin-bottom: 7px; }
.readout-card strong { font-size: 1.06rem; line-height: 1.2; }
.readout-card small { color: #8493a7; margin-top: 6px; font-size: .72rem; }
.readout-card.emphasized { border-color: rgba(50,213,131,.20); background: rgba(50,213,131,.05); }
.head-grid { padding-top: 20px; }
.micro-note { margin: 12px 2px 2px; color: #748196; font-size: .74rem; line-height: 1.5; }

.session-topline { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 19px 0 12px; }
.session-time { display: block; font-size: 1.55rem; font-variant-numeric: tabular-nums; }
.session-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 9px; }
.session-stat { padding: 12px; border: 1px solid var(--line); border-radius: 13px; background: rgba(255,255,255,.025); }
.session-stat span { display: block; color: var(--muted); font-size: .72rem; line-height: 1.2; }
.session-stat strong { display: block; margin-top: 7px; font-size: 1.05rem; font-variant-numeric: tabular-nums; }
.chart-card { margin-top: 12px; padding: 12px; border: 1px solid var(--line); border-radius: 15px; background: rgba(255,255,255,.018); }
.chart-heading { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: .76rem; margin-bottom: 9px; }
.chart-heading strong { color: var(--text); }
#historyChart { display: block; width: 100%; height: 120px; }

.privacy-box { margin-top: 14px; padding: 15px 16px; border-radius: 16px; border: 1px solid var(--line); background: rgba(255,255,255,.025); }
.privacy-box strong { font-size: .86rem; }
.privacy-box p { margin: 6px 0 0; color: var(--muted); line-height: 1.5; font-size: .8rem; }
footer { display: flex; justify-content: space-between; gap: 16px; padding: 18px 4px 0; color: #64748b; font-size: .76rem; }

.diagnostic { margin: 12px 2px 2px; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line); background: rgba(255,255,255,.035); color: #dbe4ef; font-size: .84rem; line-height: 1.5; }
.diagnostic[data-type="error"] { border-color: rgba(255,107,107,.32); background: rgba(255,107,107,.08); color: #fecaca; }
.diagnostic[data-type="success"] { border-color: rgba(50,213,131,.28); background: rgba(50,213,131,.07); color: #bbf7d0; }

[hidden] { display: none !important; }
.camera-placeholder[hidden] { display: none !important; }

@media (max-width: 940px) {
  .topbar { flex-direction: column; }
  .layout { grid-template-columns: 1fr; }
  .panel-card { order: 2; }
}

@media (max-width: 600px) {
  .app-shell { width: min(100% - 18px, 1260px); padding-top: 18px; }
  .topbar { margin: 0 6px 17px; }
  .privacy-pill { display: none; }
  .camera-card { padding: 8px; border-radius: 18px; }
  .camera-stage { min-height: 56vh; max-height: 72vh; aspect-ratio: auto; border-radius: 13px; }
  video, #overlay { touch-action: manipulation; }
  .controls { padding: 10px 3px 2px; }
  .button { flex: 1; min-height: 46px; }
  .button.compact { min-height: 38px; flex: 0 0 auto; }
  #switchBtn:not([hidden]) { flex-basis: 100%; }
  .toggle { width: 100%; margin: 2px 0 0; }
  .panel-card { padding: 16px; border-radius: 18px; }
  .panel-tabs { position: sticky; top: 6px; z-index: 8; backdrop-filter: blur(14px); background: rgba(12,17,29,.93); }
  .tab-button { padding: 9px 4px; font-size: .73rem; }
  .readout-grid { grid-template-columns: 1fr 1fr; }
  .readout-card { min-height: 94px; padding: 12px; }
  .session-grid { grid-template-columns: 1fr 1fr; }
  #historyChart { height: 105px; }
  .diagnostic { font-size: .9rem; }
  footer { flex-direction: column; }
}

@media (max-width: 390px) {
  .readout-grid, .session-grid { grid-template-columns: 1fr; }
  .panel-tabs { gap: 3px; }
  .tab-button { font-size: .69rem; }
}