/* === BINAURAL BEATS === */

.page-header { margin-bottom: 12px; }

.headphones-warn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: #FFF8E5;
  border: 1px solid #E3B978;
  border-left: 4px solid #C5701D;
  border-radius: 10px;
  margin-bottom: 22px;
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.5;
}

.hp-icon { font-size: 1.4rem; line-height: 1; }

/* Preset card — color reflects current preset */
.preset-card {
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 12px;
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
  border: 1px solid var(--border);
  color: white;
}

.preset-card[data-preset="delta"] { background: linear-gradient(135deg, #1E3A6F, #294D8A); }
.preset-card[data-preset="theta"] { background: linear-gradient(135deg, #4A2C72, #6D40A0); }
.preset-card[data-preset="alpha"] { background: linear-gradient(135deg, #2E6B47, #4A9165); }
.preset-card[data-preset="beta"]  { background: linear-gradient(135deg, #8A6914, #C8A726); }
.preset-card[data-preset="gamma"] { background: linear-gradient(135deg, #A24812, #D26618); }

.preset-card-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.preset-name {
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.preset-freq {
  font-size: 0.9rem;
  opacity: 0.85;
  font-variant-numeric: tabular-nums;
}

.preset-desc {
  font-size: 0.92rem;
  opacity: 0.92;
  line-height: 1.55;
  margin: 0;
}

/* Preset selector row */
.preset-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin-bottom: 18px;
}

.preset-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 10px 6px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-family: inherit;
  cursor: pointer;
  color: var(--text-muted);
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}

.preset-btn:hover {
  border-color: var(--green-mid);
  color: var(--green-dark);
}

.preset-btn.active {
  border-color: var(--green-dark);
  background: var(--green-light);
  color: var(--green-dark);
}

.pb-title {
  font-weight: 600;
  font-size: 0.88rem;
}

.pb-sub {
  font-size: 0.7rem;
  opacity: 0.85;
}

/* Settings */
.settings {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 18px;
  margin-bottom: 18px;
}

.settings-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
}

.settings-row:last-child { border-bottom: none; }

.settings-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  flex: 0 0 auto;
  min-width: 140px;
}

.seg-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  flex: 1 1 auto;
}

.seg {
  background: transparent;
  border: 1.5px solid var(--border);
  border-radius: 100px;
  padding: 8px 14px;
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.seg:hover { border-color: var(--green-mid); color: var(--green-dark); }

.seg.active {
  background: var(--green-light);
  border-color: var(--green-mid);
  color: var(--green-dark);
  font-weight: 500;
}

.volume-row .slider {
  flex: 1 1 auto;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: var(--green-light);
  cursor: pointer;
}

.volume-row .slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--green-dark);
  border: 2px solid var(--surface);
  cursor: pointer;
}

.volume-row .slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--green-dark);
  border: 2px solid var(--surface);
  cursor: pointer;
}

.volume-val {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  min-width: 40px;
  text-align: right;
}

/* Override shared .controls (column → row) — Start and Stop sit side-by-side */
.controls {
  flex-direction: row;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

/* Stage / timer */
.bb-stage {
  text-align: center;
  margin: 24px 0 12px;
}

.bb-timer {
  font-size: 3.6rem;
  font-weight: 300;
  color: var(--text);
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.bb-status {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 8px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Disclaimer line under controls */
.disclaimer-line {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  margin-top: 20px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}

/* Info section helpers */
.numbered-steps {
  list-style: decimal;
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 14px 0 16px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.info-section a {
  color: var(--green-dark);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.info-section a:hover { color: var(--green-mid); }

.disclaimer-block {
  margin-top: 28px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--green-mid);
  border-radius: 10px;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.disclaimer-block strong { color: var(--text); }

@media (max-width: 540px) {
  .preset-row { grid-template-columns: repeat(2, 1fr); }
  .preset-card { padding: 16px 18px; }
  .preset-name { font-size: 1.4rem; }
  .settings-label { min-width: 100%; margin-bottom: 4px; }
  .volume-row .volume-val { min-width: 36px; }
  .bb-timer { font-size: 2.8rem; }
}

@media (max-width: 480px) {
  main { padding-top: 24px; }
  .settings { padding: 6px 14px; }
}