/* ============ Decibel · Style ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-bg: #06070d;
  --c-bg-2: #11131f;
  --c-card: rgba(20,22,38,.72);
  --c-card-hi: rgba(28,30,48,.85);
  --c-border: rgba(255,255,255,.07);
  --c-border-hi: rgba(255,255,255,.16);
  --c-text: #ecf0f7;
  --c-muted: rgba(236,240,247,.55);
  --c-faint: rgba(236,240,247,.32);
  --safe-top: env(safe-area-inset-top, 0);
  --safe-bot: env(safe-area-inset-bottom, 0);
  /* Sound categories */
  --c-quiet:    #4ad9ff;
  --c-normal:   #00e0a4;
  --c-talk:     #ffd24a;
  --c-loud:     #ffa05c;
  --c-danger:   #ff5470;
  --c-pain:     #d62a5a;
}

html, body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: 'Heebo', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overscroll-behavior-y: contain;
  -webkit-tap-highlight-color: transparent;
}
body {
  background:
    radial-gradient(900px 500px at 20% -10%, rgba(74,217,255,.10), transparent 60%),
    radial-gradient(800px 500px at 80% 110%, rgba(255,84,112,.08), transparent 60%),
    var(--c-bg);
  background-attachment: fixed;
  padding-top: calc(60px + var(--safe-top));
  padding-bottom: calc(78px + var(--safe-bot));
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Pulsing ambient */
.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(circle at 50% 40%, var(--ambient-color, rgba(0,224,164,0.05)) 0%, transparent 60%);
  transition: background 1s ease;
}

/* ============ HEADER ============ */
.app-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: calc(60px + var(--safe-top));
  padding-top: var(--safe-top);
  padding-inline: 18px;
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(6,7,13,.78);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-bottom: 1px solid var(--c-border);
  z-index: 100;
}
.brand { display: flex; align-items: center; gap: 10px; }
.logo {
  width: 30px; height: 30px;
  background: linear-gradient(135deg, var(--c-quiet), var(--c-normal));
  border-radius: 9px;
  display: grid; place-items: center;
  font-weight: 800;
  font-size: 13px;
  color: #0c0f1a;
  letter-spacing: -0.04em;
  box-shadow: 0 6px 18px rgba(0,224,164,.4);
}
.brand-name {
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.02em;
}
.install-btn {
  background: linear-gradient(135deg, var(--c-quiet), var(--c-normal));
  color: #0a0c14;
  border: none;
  padding: 9px 18px;
  border-radius: 999px;
  font-family: inherit;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(0,224,164,.35);
}
.install-btn:active { transform: scale(.96); }
.hidden { display: none !important; }

main { padding: 22px 18px; max-width: 480px; margin: 0 auto; }

.panel { animation: fade .35s cubic-bezier(.2,.9,.3,1.05); }
@keyframes fade {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============ LIVE METER ============ */
.live-panel { text-align: center; }
.live-status {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  font-size: 12px;
  color: var(--c-muted);
  margin-bottom: 18px;
  letter-spacing: .5px;
  font-family: 'IBM Plex Mono', monospace;
  text-transform: uppercase;
}
.live-status .live-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--c-faint);
  transition: background .3s, box-shadow .3s;
}
.live-status.recording .live-dot {
  background: var(--c-danger);
  box-shadow: 0 0 10px var(--c-danger);
  animation: pulse-dot 1.4s ease-in-out infinite;
}
@keyframes pulse-dot { 50% { opacity: .35; } }

/* Circular gauge */
.gauge-wrap {
  position: relative;
  width: 320px; height: 320px;
  margin: 0 auto 24px;
  max-width: 80vw;
}
.gauge-svg {
  width: 100%; height: 100%;
}
.gauge-track {
  fill: none;
  stroke: rgba(255,255,255,.10);
  stroke-width: 14;
  stroke-linecap: round;
}
.gauge-fill {
  fill: none;
  stroke: var(--gauge-color, var(--c-quiet));
  stroke-width: 14;
  stroke-linecap: round;
  transition: stroke .25s ease;
  filter: drop-shadow(0 0 12px var(--gauge-color, var(--c-quiet)));
}
.gauge-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.gauge-value {
  font-size: 84px;
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
  color: var(--gauge-color, var(--c-text));
  font-family: 'Heebo', sans-serif;
  font-variant-numeric: tabular-nums;
  transition: color .3s;
}
.gauge-unit {
  font-size: 14px;
  font-family: 'IBM Plex Mono', monospace;
  color: var(--c-muted);
  letter-spacing: 3px;
  margin-top: 4px;
}
.gauge-cat {
  margin-top: 14px;
  font-size: 18px;
  font-weight: 700;
  color: var(--gauge-color, var(--c-text));
  transition: color .3s;
  letter-spacing: -0.01em;
}

/* Min/Max/Avg row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}
.stat {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 14px;
  padding: 14px 8px;
  text-align: center;
}
.stat .label {
  font-size: 10px;
  letter-spacing: 2px;
  font-family: 'IBM Plex Mono', monospace;
  color: var(--c-faint);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.stat .value {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.stat .value .unit {
  font-size: 12px;
  color: var(--c-muted);
  font-weight: 500;
  margin-inline-start: 2px;
}

/* Spectrum bars */
.spectrum {
  height: 70px;
  display: flex;
  align-items: flex-end;
  gap: 3px;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 14px;
  padding: 12px;
  margin-bottom: 20px;
}
.spec-bar {
  flex: 1;
  background: linear-gradient(180deg, var(--c-quiet), var(--c-normal));
  border-radius: 3px;
  min-height: 2px;
  transition: height .08s linear;
}

/* Action buttons */
.actions {
  display: flex; flex-direction: column; gap: 10px;
}
.btn-big {
  width: 100%;
  padding: 18px;
  border: none;
  border-radius: 18px;
  font-family: inherit;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  transition: transform .15s, box-shadow .25s;
}
.btn-big.start {
  background: linear-gradient(135deg, var(--c-normal), var(--c-quiet));
  color: #0a0c14;
  box-shadow: 0 12px 30px rgba(0,224,164,.4);
}
.btn-big.stop {
  background: linear-gradient(135deg, var(--c-danger), #d62a5a);
  color: #fff;
  box-shadow: 0 12px 30px rgba(255,84,112,.4);
}
.btn-big:active { transform: scale(.97); }

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.btn-mini {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  padding: 13px;
  border-radius: 14px;
  font-family: inherit;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  transition: all .2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.btn-mini:hover { background: var(--c-card-hi); border-color: var(--c-border-hi); }
.btn-mini:disabled { opacity: .4; cursor: not-allowed; }

/* Chips */
.chip-row {
  display: flex; gap: 6px; flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 16px;
}
.chip {
  padding: 4px 10px;
  background: rgba(255,255,255,.05);
  border-radius: 999px;
  font-size: 11px;
  color: var(--c-muted);
  font-family: 'IBM Plex Mono', monospace;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.chip.icon::before { content: ''; display: inline-block; width: 6px; height: 6px; background: currentColor; border-radius: 50%; margin-inline-end: 6px; vertical-align: middle; }

/* Mic permission state */
.permission-prompt {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 18px;
  padding: 28px 22px;
  text-align: center;
  margin-top: 30px;
}
.permission-prompt .ico {
  font-size: 56px;
  margin-bottom: 14px;
}
.permission-prompt h3 {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.permission-prompt p {
  color: var(--c-muted);
  font-size: 14px;
  margin-bottom: 18px;
  line-height: 1.6;
}

/* History */
.history-panel h2,
.settings-panel h2 {
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: 26px;
  margin-bottom: 20px;
}
.session-list { display: flex; flex-direction: column; gap: 10px; }
.session-item {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 16px;
  padding: 14px 16px;
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 12px;
  align-items: center;
}
.session-item .lvl {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--lvl-color, var(--c-card-hi));
  display: grid; place-items: center;
  font-weight: 800;
  font-size: 16px;
  color: #fff;
  box-shadow: 0 0 14px var(--lvl-color, transparent);
}
.session-item .lvl .unit { font-size: 9px; opacity: .8; }
.session-item .info .when { font-weight: 600; font-size: 14px; margin-bottom: 2px; }
.session-item .info .dur { color: var(--c-muted); font-size: 12px; font-family: 'IBM Plex Mono', monospace; }
.session-item .info .label { color: var(--lvl-color, var(--c-faint)); font-size: 12px; margin-top: 2px; font-weight: 600; }
.session-item .actions-mini { display: flex; flex-direction: column; gap: 4px; }
.session-item .actions-mini button {
  background: transparent;
  border: 1px solid var(--c-border);
  color: var(--c-muted);
  padding: 5px 9px;
  border-radius: 8px;
  font-size: 11px;
  cursor: pointer;
  font-family: inherit;
}
.session-item .actions-mini button:hover { background: rgba(255,255,255,.04); color: var(--c-text); }

.empty-state {
  padding: 60px 20px;
  text-align: center;
  color: var(--c-muted);
}
.empty-state .ico { font-size: 48px; margin-bottom: 16px; opacity: .5; }
.empty-state p { font-size: 14px; line-height: 1.6; }

/* Settings */
.settings-list {
  list-style: none;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 20px;
}
.settings-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  border-top: 1px solid var(--c-border);
  font-size: 14px;
}
.settings-list li:first-child { border-top: 0; }
.settings-list li strong { font-weight: 600; }
.settings-list li span { color: var(--c-muted); font-family: 'IBM Plex Mono', monospace; font-size: 12px; }
.btn-link, .btn-danger-link {
  background: none; border: none; font-family: inherit; font-size: 14px; cursor: pointer; padding: 0; width: 100%; text-align: right;
  color: var(--c-text);
}
.btn-danger-link { color: var(--c-danger); }

/* Slider for calibration */
.slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-top: 1px solid var(--c-border);
}
.slider-row .label { font-weight: 600; font-size: 14px; min-width: 80px; }
.slider-row input[type=range] {
  flex: 1;
  -webkit-appearance: none; appearance: none;
  height: 4px;
  background: var(--c-bg-2);
  border-radius: 2px;
  outline: none;
}
.slider-row input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 18px; height: 18px;
  background: var(--c-normal);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,224,164,.4);
}
.slider-row .val {
  min-width: 40px;
  text-align: center;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--c-muted);
}

/* Bottom nav */
.bottom-nav {
  position: fixed;
  left: 12px; right: 12px;
  bottom: calc(12px + var(--safe-bot));
  height: 64px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  padding: 6px;
  background: rgba(20,22,38,.85);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--c-border);
  border-radius: 22px;
  z-index: 50;
  box-shadow: 0 18px 50px rgba(0,0,0,.4);
  max-width: 480px;
  margin: 0 auto;
}
.nav-btn {
  background: transparent;
  border: none;
  color: var(--c-muted);
  font-family: inherit;
  font-size: 11px;
  font-weight: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  border-radius: 16px;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.nav-btn span:first-child { font-size: 20px; }
.nav-btn.active {
  background: rgba(0,224,164,.18);
  color: var(--c-normal);
}

/* Toast */
.toast {
  position: fixed;
  bottom: calc(90px + var(--safe-bot));
  left: 50%;
  transform: translateX(-50%);
  background: var(--c-card-hi);
  border: 1px solid var(--c-border-hi);
  color: var(--c-text);
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  z-index: 300;
  box-shadow: 0 18px 40px rgba(0,0,0,.5);
  animation: toast-in .25s cubic-bezier(.2,.9,.3,1.05);
}
.toast.error { color: var(--c-danger); border-color: rgba(255,84,112,.4); }
.toast.success { color: var(--c-normal); border-color: rgba(0,224,164,.4); }
@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 16px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* Save modal */
.modal {
  position: fixed; inset: 0;
  background: rgba(6,7,13,.78);
  backdrop-filter: blur(8px);
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 20px;
  animation: modal-in .25s ease;
}
@keyframes modal-in { from { opacity: 0; } to { opacity: 1; } }
.modal-card {
  background: var(--c-card-hi);
  border: 1px solid var(--c-border-hi);
  border-radius: 22px;
  padding: 26px 22px;
  width: 100%; max-width: 380px;
}
.modal-card h3 {
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.modal-card p {
  color: var(--c-muted);
  font-size: 13px;
  margin-bottom: 18px;
}
.modal-input {
  width: 100%;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  padding: 12px 14px;
  border-radius: 12px;
  font-family: inherit;
  font-size: 15px;
  margin-bottom: 14px;
}
.modal-input:focus { outline: 2px solid var(--c-normal); outline-offset: 2px; }
.modal-summary {
  background: var(--c-bg-2);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  text-align: center;
}
.modal-summary .stat-mini { font-size: 18px; font-weight: 700; }
.modal-summary .stat-mini .label { font-size: 10px; color: var(--c-faint); display: block; margin-top: 2px; font-weight: 500; }
.modal-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }