/* ── Google Font ── */
.audio-channel-tester-page {
  --bg: var(--page-bg);
  --bg2: var(--panel-soft);
  --bg3: var(--panel-hover);
  --surface: var(--panel);
  --border: var(--header-border);
  --border2: color-mix(in srgb, var(--text-muted) 36%, var(--header-border));
  --accent2: var(--accent-strong);
  --accent3: color-mix(in srgb, var(--accent) 55%, #7fff00);
  --gold: #f2b84b;
  --text: var(--text-strong);
  --text-muted: var(--text-soft);
  --success: #00b87a;
  --warn: #d99a00;
  --danger: #e05260;
  --font: var(--font-body);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.audio-channel-tester-page,.audio-channel-tester-page *{box-sizing:border-box;}

.act-wrap {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 70vh;
  padding: 2.5rem 0 4rem;
}

.act-inner { max-width: 1200px; margin: 0 auto; padding: 0 1.25rem; }

/* ── Header ── */
.act-header { text-align: center; margin-bottom: 2.5rem; }
.act-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  letter-spacing: 0;
  background: linear-gradient(135deg, var(--accent) 0%, #0099ff 50%, var(--accent2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.6rem;
}
.act-header p { color: var(--text-muted); font-size: 1.05rem; }
.format-pills { display: flex; gap: 0.5rem; justify-content: center; flex-wrap: wrap; margin-top: 1rem; }
.format-pill {
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: 1px solid;
}
.pill-stereo  { color: var(--accent);  border-color: var(--accent);  background: rgba(0,212,255,0.08); }
.pill-51      { color: var(--accent2); border-color: var(--accent2); background: rgba(255,107,53,0.08); }
.pill-71      { color: var(--gold);    border-color: var(--gold);    background: rgba(255,215,0,0.08); }
.pill-atmos   { color: var(--accent3); border-color: var(--accent3); background: rgba(127,255,0,0.08); }

/* ── Panel ── */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}
.panel-title {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.panel-title::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 14px;
  background: var(--accent);
  border-radius: 2px;
}

/* ── Drop Zone ── */
.drop-zone {
  border: 2px dashed var(--border2);
  border-radius: 12px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
  background: var(--bg2);
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(0,212,255,0.04);
}
.drop-zone input[type=file] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%;
}
.drop-icon { font-size: 3rem; margin-bottom: 0.75rem; display: block; }
.drop-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.35rem; }
.drop-sub { color: var(--text-muted); font-size: 0.875rem; }

.or-divider {
  display: flex; align-items: center; gap: 1rem;
  color: var(--text-muted); font-size: 0.85rem;
  margin: 1.25rem 0;
}
.or-divider::before, .or-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}

.url-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.url-input {
  flex: 1; min-width: 200px;
  padding: 0.75rem 1rem;
  background: var(--bg2);
  border: 2px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.9rem;
  transition: border-color 0.2s;
}
.url-input:focus { outline: none; border-color: var(--accent); }
.url-input::placeholder { color: var(--text-muted); }

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #0099ff);
  color: #000;
}
.btn-primary:hover:not(:disabled) { filter: brightness(1.15); transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-ghost {
  background: var(--bg3);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--border2); color: var(--text); }

/* ── Main Grid ── */
.main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 900px) {
  .main-grid { grid-template-columns: 1.5fr 1fr; }
}

/* ── Theater ── */
#theaterCanvas {
  width: 100%;
  border-radius: 10px;
  display: block;
  background: #0d0f14;
}

/* ── Channel meters ── */
.meters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
  gap: 0.75rem;
}
.meter-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.meter-bar-wrap {
  width: 28px;
  height: 110px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column-reverse;
}
.meter-bar {
  width: 100%;
  height: 0%;
  border-radius: 3px;
  transition: height 0.05s linear;
}
.meter-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: center;
  color: var(--text-muted);
  font-family: var(--mono);
}
.meter-db {
  font-size: 0.6rem;
  font-family: var(--mono);
  color: var(--text-muted);
  text-align: center;
}

/* ── Format badge ── */
.format-detected {
  display: none;
  margin-bottom: 1.25rem;
  padding: 1.25rem 1.5rem;
  border-radius: 12px;
  border: 1px solid;
  align-items: center;
  gap: 1.5rem;
}
.format-detected.show { display: flex; }
.fmt-icon { font-size: 2.5rem; }
.fmt-name { font-size: 1.6rem; font-weight: 900; letter-spacing: 0; }
.fmt-desc { font-size: 0.875rem; color: var(--text-muted); }
.fmt-badges { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.4rem; }
.fmt-badge {
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  background: rgba(255,255,255,0.1);
}

/* ── Info table ── */
.info-rows { font-size: 0.875rem; }
.info-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}
.info-row:last-child { border-bottom: none; }
.info-key { color: var(--text-muted); }
.info-val { font-weight: 700; font-family: var(--mono); color: var(--accent); }

/* ── Log ── */
.log-body {
  max-height: 200px;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 0.775rem;
}
.log-line {
  padding: 3px 0;
  display: flex;
  gap: 0.6rem;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}
.log-ts { color: var(--text-muted); flex-shrink: 0; }
.log-success { color: var(--success); }
.log-error   { color: var(--danger); }
.log-warn    { color: var(--warn); }
.log-info    { color: var(--accent); }

/* ── Audio controls ── */
.audio-wrap {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
}
audio { width: 100%; filter: invert(0); accent-color: var(--accent); }

/* ── Spinner ── */
.spinner {
  width: 18px; height: 18px;
  border: 2px solid rgba(0,0,0,0.3);
  border-top-color: #000;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: none;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── How to ── */
.howto {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 1.5rem;
}
.howto h3 { font-weight: 800; margin-bottom: 1rem; color: var(--accent); }
.howto ol  { padding-left: 1.25rem; color: var(--text-muted); line-height: 2.2; font-size: 0.9rem; }
.howto li strong { color: var(--text); }

/* Mixer CTA */
.mixer-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid color-mix(in srgb, var(--accent) 32%, var(--header-border, var(--border)));
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 8%, var(--panel, var(--surface)));
  box-shadow: var(--shadow, 0 18px 45px rgba(0,0,0,.18));
}
.mixer-cta-title { font-size: 1rem; font-weight: 800; color: var(--text-strong, var(--text)); margin-bottom: .2rem; }
.mixer-cta-text { font-size: .86rem; color: var(--text-soft, var(--text-muted)); line-height: 1.55; }
.mixer-cta-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  flex-shrink: 0;
  padding: .72rem 1rem;
  border-radius: 10px;
  background: var(--accent);
  color: #061014 !important;
  font-weight: 800;
  text-decoration: none !important;
  box-shadow: 0 10px 24px color-mix(in srgb, var(--accent) 22%, transparent);
}
.mixer-cta-link:hover { background: var(--accent-strong, var(--accent)); transform: translateY(-1px); }
@media(max-width:720px){.mixer-cta{align-items:flex-start;flex-direction:column}.mixer-cta-link{width:100%;}}
.audio-channel-tester-page .quick-tests{margin-top:1.25rem;padding-top:1.25rem;border-top:1px solid var(--border);}
.audio-channel-tester-page .quick-tests-title{font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);margin-bottom:.75rem;}
.audio-channel-tester-page .quick-tests-row{display:flex;gap:.5rem;flex-wrap:wrap;}
.audio-channel-tester-page .btn-sm{font-size:.8rem;padding:.4rem .85rem;}
.audio-channel-tester-page .panel-compact{padding:1rem;}
.audio-channel-tester-page .panel-hidden{display:none;}
.audio-channel-tester-page .log-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:.75rem;}
.audio-channel-tester-page .log-head .panel-title{margin-bottom:0;}
.audio-channel-tester-page .panel-actions .btn{padding:.3rem .75rem;font-size:.78rem;}