/* ============================================================
   hushmeter — instrument panel. near-black + neon-lime scope,
   a single amber peak accent. precise, technical, calm.
   ============================================================ */

:root {
  --black:   #0B0E0C;
  --panel:   #12160F;
  --panel2:  #171C13;
  --line:    #2A331F;
  --line2:   #38431F;
  --paper:   #E7EFDD;
  --mute:    #8A9878;
  --dim:     #5F6C50;
  --lime:    #B6FF3C;
  --lime-dk: #86C41f;
  --amber:   #FFB020;
  --danger:  #FF6A3C;

  --lime-dim:  rgba(182, 255, 60, 0.12);
  --amber-dim: rgba(255, 176, 32, 0.14);
  --danger-dim:rgba(255, 106, 60, 0.16);

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 22px 50px -28px rgba(0,0,0,0.85);
  --wrap: 1080px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--black);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: -0.003em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Instrument grid wash so the flat black never reads dead */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(1100px 560px at 80% -10%, rgba(182,255,60,0.05), transparent 60%),
    radial-gradient(820px 480px at 6% 6%, rgba(255,176,32,0.035), transparent 55%);
  pointer-events: none;
}

h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: -0.02em; line-height: 1.08; }
p { margin: 0; }
em { font-style: normal; color: var(--paper); }
a { color: var(--lime); text-decoration-color: rgba(182,255,60,0.4); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--lime); }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 12px; top: -60px;
  background: var(--lime); color: #0c1400;
  padding: 10px 16px; border-radius: 10px; font-weight: 700;
  z-index: 60; transition: top 0.18s var(--ease); text-decoration: none;
}
.skip-link:focus { top: 12px; }

/* --- shared focus ring --- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
  border-radius: 6px;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--mute);
  font-weight: 600;
}

/* ============================================================
   HERO + scope-trace signature
   ============================================================ */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #0c1109 0%, var(--black) 100%);
}
.hero__grid {
  position: absolute; inset: 0;
  z-index: 0;
  opacity: 0.85;
  mask-image: linear-gradient(180deg, #000 0%, #000 50%, transparent 96%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 50%, transparent 96%);
}
.grid { width: 100%; height: 100%; display: block; }
.grid__lines line { stroke: var(--line); stroke-width: 1; vector-effect: non-scaling-stroke; }
.grid__trace path {
  fill: none;
  stroke: var(--lime);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
  opacity: 0.55;
  filter: drop-shadow(0 0 6px rgba(182,255,60,0.4));
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(30px, 5vw, 60px) clamp(20px, 5vw, 44px) clamp(28px, 3.5vw, 44px);
}
.hero__title {
  font-size: clamp(2.1rem, 6vw, 3.7rem);
  margin: 12px 0 0;
  max-width: 16ch;
}
.hero__accent { color: var(--lime); }
.hero__lede {
  margin-top: 16px;
  max-width: 58ch;
  color: var(--mute);
  font-size: clamp(0.98rem, 1.3vw, 1.1rem);
}
.hero__lede em { color: var(--paper); font-weight: 600; }

.hero__badge {
  margin-top: 22px;
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 0.86rem; color: var(--mute);
  background: var(--amber-dim);
  border: 1px solid rgba(255,176,32,0.35);
  border-radius: 999px;
  padding: 8px 16px 8px 12px;
}
.hero__badge strong { color: var(--paper); font-weight: 700; }
.hero__badge a { font-weight: 600; white-space: nowrap; }
.hero__badge-dot {
  flex: none; width: 9px; height: 9px; border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--amber-dim);
}

/* ============================================================
   LIVE METER
   ============================================================ */
.live {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(24px, 4vw, 40px) clamp(20px, 5vw, 44px) 0;
}
.live__panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(23,28,19,0.9), rgba(18,22,15,0.9));
  box-shadow: var(--shadow);
  overflow: hidden;
}

/* scope area */
.scope { padding: clamp(18px, 3vw, 26px); }
.scope__head { display: flex; align-items: flex-end; justify-content: flex-start; }

.readout { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.readout__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(3.2rem, 12vw, 5.4rem);
  line-height: 0.9;
  color: var(--lime);
  letter-spacing: -0.03em;
  text-shadow: 0 0 24px rgba(182,255,60,0.28);
  transition: color 0.3s var(--ease), text-shadow 0.3s var(--ease);
}
.readout.is-loud .readout__num { color: var(--amber); text-shadow: 0 0 24px rgba(255,176,32,0.3); }
.readout.is-risk .readout__num { color: var(--danger); text-shadow: 0 0 24px rgba(255,106,60,0.32); }
.readout__unit {
  font-family: var(--mono);
  font-size: 1.05rem; font-weight: 600; color: var(--mute);
  letter-spacing: -0.01em;
}
.readout__unit-sub { font-size: 0.7em; color: var(--dim); }
.readout__band {
  margin-left: auto;
  align-self: center;
  font-family: var(--mono);
  font-size: 0.74rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--mute);
  border: 1px solid var(--line2);
  background: rgba(11,14,12,0.6);
  padding: 6px 12px; border-radius: 999px;
  white-space: nowrap;
}
.readout__band.is-quiet    { color: var(--lime);  border-color: rgba(182,255,60,0.45); background: var(--lime-dim); }
.readout__band.is-moderate { color: var(--lime);  border-color: rgba(182,255,60,0.4);  background: var(--lime-dim); }
.readout__band.is-loud     { color: var(--amber); border-color: rgba(255,176,32,0.5);  background: var(--amber-dim); }
.readout__band.is-risk     { color: var(--danger);border-color: rgba(255,106,60,0.55); background: var(--danger-dim); }

/* canvas / scope face */
.scope__canvas-wrap {
  position: relative;
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background:
    repeating-linear-gradient(90deg, rgba(56,67,31,0.16) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(0deg, rgba(56,67,31,0.16) 0 1px, transparent 1px 36px),
    #0a0d08;
  overflow: hidden;
}
.scope__canvas { display: block; width: 100%; height: auto; }
.scope__scale {
  position: absolute; right: 8px; top: 6px;
  display: flex; flex-direction: column; gap: 0;
  font-family: var(--mono); font-size: 0.6rem; color: var(--dim);
  text-align: right;
}

/* stats row */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
}
.stat {
  padding: 14px 18px;
  display: flex; flex-direction: column; gap: 3px;
  border-right: 1px solid var(--line);
}
.stat:last-child { border-right: none; }
.stat__label {
  font-family: var(--mono); font-size: 0.66rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.14em; color: var(--dim);
}
.stat__val {
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  font-size: 1.4rem; font-weight: 700; color: var(--paper);
  letter-spacing: -0.02em;
}
.stat--avg .stat__val { color: var(--lime); }
.stat__val--peak { color: var(--amber); }

/* controls */
.live__controls {
  margin-top: 18px;
  display: flex; align-items: center; gap: 26px; flex-wrap: wrap;
}
.live__buttons { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.96rem;
  letter-spacing: -0.01em;
  border-radius: 11px;
  cursor: pointer;
  border: 1px solid transparent;
  padding: 13px 24px;
  transition: transform 0.12s var(--ease), background 0.16s var(--ease),
              box-shadow 0.16s var(--ease), border-color 0.16s var(--ease), color 0.16s var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn--primary {
  background: var(--lime);
  color: #0c1400;
  box-shadow: 0 12px 30px -14px rgba(182,255,60,0.6);
}
.btn--primary:not(:disabled):hover { background: #c8ff5f; }
.btn--rec {
  background: rgba(11,14,12,0.5);
  color: var(--paper);
  border-color: var(--line2);
}
.btn--rec:not(:disabled):hover { border-color: var(--mute); background: rgba(11,14,12,0.8); }
.btn--rec.is-recording {
  background: var(--danger-dim);
  border-color: rgba(255,106,60,0.6);
  color: #ffd6c8;
}
.btn--rec.is-recording::before {
  content: "";
  display: inline-block; width: 9px; height: 9px; margin-right: 8px;
  border-radius: 50%; background: var(--danger);
  vertical-align: middle;
  animation: pulse 1.2s var(--ease) infinite;
}
.btn--ghost {
  background: rgba(11,14,12,0.4);
  color: var(--paper);
  border-color: var(--line2);
  padding: 11px 18px;
}
.btn--ghost:hover { border-color: var(--mute); background: rgba(11,14,12,0.7); }

@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.25; } }

/* calibration */
.calib { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 260px; }
.calib__label {
  font-family: var(--mono); font-size: 0.72rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.1em; color: var(--mute);
  white-space: nowrap;
}
.calib__range {
  flex: 1; min-width: 120px;
  -webkit-appearance: none; appearance: none;
  height: 6px; border-radius: 999px;
  background: linear-gradient(90deg, var(--line2), var(--line2));
  background-color: var(--line2);
  cursor: pointer; margin: 0;
}
.calib__range::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--lime); border: 3px solid var(--panel);
  box-shadow: 0 0 0 1px var(--line2), 0 0 12px -2px rgba(182,255,60,0.7);
  cursor: pointer;
}
.calib__range::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--lime); border: 3px solid var(--panel);
  box-shadow: 0 0 0 1px var(--line2); cursor: pointer;
}
.calib__out {
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  font-size: 0.9rem; font-weight: 700; color: var(--lime);
  min-width: 62px; text-align: right;
}
.calib__hint {
  margin-top: 10px;
  font-size: 0.82rem; color: var(--mute); max-width: 68ch;
}

.live__msg {
  margin-top: 14px;
  font-size: 0.9rem; color: var(--mute);
  min-height: 1.2em;
}
.live__msg.is-error { color: #ffb7a3; }
.live__msg.is-ok { color: var(--lime); }

/* ============================================================
   SESSION TIMELINE
   ============================================================ */
.timeline {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(28px, 4vw, 40px) clamp(20px, 5vw, 44px) 0;
}
.timeline__head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.timeline__heading { font-size: 1.2rem; }
.timeline__meta {
  font-family: var(--mono); font-size: 0.82rem; color: var(--mute);
  font-variant-numeric: tabular-nums;
}
.timeline__canvas-wrap {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background:
    repeating-linear-gradient(0deg, rgba(56,67,31,0.14) 0 1px, transparent 1px 40px),
    #0a0d08;
  overflow: hidden;
}
.timeline__canvas { display: block; width: 100%; height: auto; }

/* ============================================================
   HISTORY
   ============================================================ */
.history {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(30px, 4.5vw, 46px) clamp(20px, 5vw, 44px) 0;
}
.history__head { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.history__heading { font-size: 1.2rem; }
.history__list { margin-top: 16px; display: flex; flex-direction: column; gap: 12px; }
.history__empty {
  margin-top: 16px;
  font-size: 0.92rem; color: var(--mute);
  border: 1px dashed var(--line2);
  border-radius: var(--radius-sm);
  padding: 20px 22px;
  line-height: 1.55;
}
.history__empty strong { color: var(--paper); }

.session {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, rgba(23,28,19,0.6), rgba(18,22,15,0.6));
  overflow: hidden;
}
.session__row {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 18px;
  flex-wrap: wrap;
}
.session__namewrap {
  display: flex; flex-direction: column; gap: 2px;
  flex: 1 1 200px; min-width: 0;
}
.session__name {
  font-weight: 700; font-size: 1rem; color: var(--paper);
  min-width: 0;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.session__when { font-family: var(--mono); font-size: 0.74rem; color: var(--dim); }
.session__facts { display: flex; gap: 8px; flex-wrap: wrap; }
.sfact {
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  font-size: 0.78rem; font-weight: 600; color: var(--mute);
  border: 1px solid var(--line2);
  background: rgba(11,14,12,0.5);
  padding: 3px 9px; border-radius: 7px;
  white-space: nowrap;
}
.sfact b { color: var(--paper); font-weight: 700; }
.sfact--peak b { color: var(--amber); }
.sfact--avg b { color: var(--lime); }
.session__actions { display: flex; gap: 8px; margin-left: auto; }
.icon-btn {
  font-family: var(--mono); font-size: 0.76rem; font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--line2);
  background: rgba(11,14,12,0.5);
  color: var(--mute);
  border-radius: 8px; padding: 7px 12px;
  transition: all 0.14s var(--ease);
}
.icon-btn:hover { color: var(--paper); border-color: var(--mute); }
.icon-btn--danger:hover { color: #ffb7a3; border-color: rgba(255,106,60,0.6); background: var(--danger-dim); }

.session__detail {
  border-top: 1px solid var(--line);
  padding: 14px 18px 18px;
  background: rgba(10,13,8,0.5);
}
.session__detail[hidden] { display: none; }
.session__canvas-wrap {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background:
    repeating-linear-gradient(0deg, rgba(56,67,31,0.12) 0 1px, transparent 1px 32px),
    #0a0d08;
  overflow: hidden;
}
.session__canvas { display: block; width: 100%; height: auto; }

/* ============================================================
   REFERENCE GUIDE
   ============================================================ */
.reference {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(30px, 4.5vw, 48px) clamp(20px, 5vw, 44px) clamp(40px, 6vw, 64px);
}
.reference__inner {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(23,28,19,0.5), rgba(18,22,15,0.5));
  padding: clamp(22px, 3.5vw, 34px);
}
.reference__heading { font-size: 1.3rem; }
.reference__note {
  margin-top: 10px; font-size: 0.9rem; color: var(--mute); max-width: 70ch;
}
.reference__note em { color: var(--paper); }
.ref-scale { list-style: none; margin: 22px 0 0; padding: 0; display: flex; flex-direction: column; }
.ref-row {
  display: grid; grid-template-columns: 88px 1fr; align-items: center; gap: 16px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
}
.ref-row:first-child { border-top: none; }
.ref-row__db {
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  font-size: 1.05rem; font-weight: 700;
  text-align: right; letter-spacing: -0.02em;
  position: relative; padding-right: 16px;
}
.ref-row__db::after {
  content: ""; position: absolute; right: 0; top: 50%;
  width: 8px; height: 8px; margin-top: -4px; border-radius: 50%;
}
.ref-row[data-band="quiet"] .ref-row__db { color: var(--lime); }
.ref-row[data-band="quiet"] .ref-row__db::after { background: var(--lime-dk); }
.ref-row[data-band="moderate"] .ref-row__db { color: var(--lime); }
.ref-row[data-band="moderate"] .ref-row__db::after { background: var(--lime); }
.ref-row[data-band="loud"] .ref-row__db { color: var(--amber); }
.ref-row[data-band="loud"] .ref-row__db::after { background: var(--amber); }
.ref-row[data-band="risk"] .ref-row__db { color: var(--danger); }
.ref-row[data-band="risk"] .ref-row__db::after { background: var(--danger); box-shadow: 0 0 0 3px var(--danger-dim); }
.ref-row__name { font-size: 0.95rem; color: var(--paper); }
.reference__risk {
  margin-top: 22px;
  font-size: 0.86rem; color: var(--mute);
  border-left: 3px solid var(--danger);
  padding: 4px 0 4px 16px;
  max-width: 72ch;
}
.reference__risk strong { color: var(--paper); }

/* ============================================================
   SAVE DIALOG
   ============================================================ */
.save-dialog {
  border: 1px solid var(--line2);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--paper);
  padding: 0;
  width: min(440px, 92vw);
  box-shadow: 0 30px 70px -20px rgba(0,0,0,0.85);
}
.save-dialog::backdrop { background: rgba(6,8,5,0.68); backdrop-filter: blur(3px); }
.save-form { padding: 24px; }
.save-form__title { font-size: 1.2rem; }
.save-form__summary {
  margin-top: 8px; font-family: var(--mono); font-size: 0.82rem; color: var(--mute);
  font-variant-numeric: tabular-nums;
}
.save-form__label {
  display: block; margin-top: 18px; margin-bottom: 8px;
  font-family: var(--mono); font-size: 0.72rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.1em; color: var(--mute);
}
.save-form__input {
  width: 100%;
  font-family: var(--sans); font-size: 1rem; color: var(--paper);
  background: rgba(11,14,12,0.7);
  border: 1px solid var(--line2);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}
.save-form__input:hover { border-color: var(--mute); }
.save-form__actions {
  margin-top: 22px; display: flex; gap: 12px; justify-content: flex-end;
}

/* ============================================================
   FOOTER
   ============================================================ */
.foot {
  border-top: 1px solid var(--line);
  background: #090c07;
}
.foot__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 30px clamp(20px, 5vw, 44px) 42px;
}
.foot__disclaimer {
  font-size: 0.85rem; color: var(--mute); max-width: 82ch; line-height: 1.6;
}
.foot__disclaimer strong { color: var(--paper); }
.foot__meta {
  margin-top: 18px;
  display: flex; flex-wrap: wrap; gap: 8px 10px;
  font-size: 0.76rem; color: var(--mute);
  font-family: var(--mono);
}
.foot__dot { color: var(--line2); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 640px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--line); }
  .live__controls { flex-direction: column; align-items: stretch; }
  .live__buttons .btn { flex: 1; }
  .calib { min-width: 0; }
  .readout__band { margin-left: 0; }
  .session__actions { margin-left: 0; width: 100%; }
  .icon-btn { flex: 1; text-align: center; }
}

/* ============================================================
   LIGHT SCHEME — instrument stays dark by design, but honour
   light-mode contrast for chrome/text where it helps.
   ============================================================ */
@media (prefers-color-scheme: light) {
  :root {
    --paper: #EAF2E0;
    --mute: #93A181;
  }
  /* The scope reads best on black; we keep the panel dark
     and only lift ambient wash slightly for light-mode users. */
  body::before {
    background:
      radial-gradient(1100px 560px at 80% -10%, rgba(182,255,60,0.07), transparent 60%),
      radial-gradient(820px 480px at 6% 6%, rgba(255,176,32,0.05), transparent 55%);
  }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .grid__trace path { animation: none !important; }
  .btn--rec.is-recording::before { animation: none !important; opacity: 1; }
}

/* Hero trace drift (paused for reduced motion above) */
.grid__trace path { animation: trace-drift 22s linear infinite; }
@keyframes trace-drift {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-160px); }
}