/**
 * Frequencies Player — static site (matches Quick Schumann Check / qsc-marketing).
 */
.qsc-marketing {
  --qsc-bg: #0a0e17;
  --qsc-surface: #111827;
  --qsc-surface-hover: #1a2332;
  --qsc-accent: #6366f1;
  --qsc-accent-glow: rgba(99, 102, 241, 0.4);
  --qsc-text: #e2e8f0;
  --qsc-muted: #94a3b8;
  --qsc-border: rgba(148, 163, 184, 0.15);
  --qsc-exclusive: rgba(34, 197, 94, 0.15);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--qsc-bg);
  color: var(--qsc-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
.qsc-marketing * { box-sizing: border-box; }
.qsc-marketing a:not(.qsc-btn) { color: var(--qsc-accent); text-decoration: none; }
.qsc-marketing a:not(.qsc-btn):hover { text-decoration: underline; }

.qsc-site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--qsc-border);
  background: rgba(17, 24, 39, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.qsc-site-brand {
  font-weight: 700;
  color: var(--qsc-text);
  text-decoration: none;
}
.qsc-site-brand:hover { text-decoration: none; }
.qsc-site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  font-size: 0.9rem;
}
.qsc-site-nav a { color: var(--qsc-muted); }
.qsc-site-nav a:hover { color: var(--qsc-text); text-decoration: none; }

.qsc-hero {
  position: relative;
  padding: clamp(3rem, 8vw, 5rem) 1.5rem;
  text-align: center;
  overflow: hidden;
}
.qsc-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, var(--qsc-accent-glow), transparent);
  pointer-events: none;
}
.qsc-hero h1 {
  position: relative;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
  background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.qsc-hero .qsc-tagline {
  position: relative;
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--qsc-muted);
  margin: 0 auto 1.5rem;
  max-width: 42em;
}
.qsc-hero .qsc-subtitle {
  position: relative;
  font-size: 0.9rem;
  color: var(--qsc-muted);
  margin-bottom: 1.5rem;
}
.qsc-featured-banner {
  position: relative;
  max-width: min(42rem, 100%);
  margin: 0 auto 1.75rem;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--qsc-border);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}
.qsc-featured-banner img {
  width: 100%;
  height: auto;
  display: block;
  vertical-align: middle;
}
.qsc-cta-row {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  align-items: center;
}
.qsc-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s, box-shadow 0.15s;
  text-decoration: none;
}
.qsc-btn:hover { transform: translateY(-2px); text-decoration: none; }
.qsc-btn-primary {
  background: linear-gradient(135deg, var(--qsc-accent), #818cf8);
  color: #fff;
  box-shadow: 0 4px 20px var(--qsc-accent-glow);
}
.qsc-btn-primary:hover {
  color: #fff;
  box-shadow: 0 6px 28px var(--qsc-accent-glow);
}
.qsc-btn-secondary {
  background: var(--qsc-surface);
  color: var(--qsc-text);
  border: 1px solid var(--qsc-border);
}
.qsc-btn-secondary:hover {
  color: var(--qsc-text);
  background: var(--qsc-surface-hover);
}

.qsc-section {
  padding: clamp(2.5rem, 5vw, 3.5rem) 1.5rem;
  max-width: 72rem;
  margin: 0 auto;
}
.qsc-section h2 {
  text-align: center;
  font-size: clamp(1.5rem, 3vw, 1.875rem);
  font-weight: 700;
  margin: 0 0 1.5rem;
}
.qsc-section h3 {
  font-size: clamp(1.1rem, 2vw, 1.25rem);
  font-weight: 600;
  margin: 0 0 0.75rem;
}
.qsc-section-lead {
  text-align: center;
  color: var(--qsc-muted);
  max-width: 44em;
  margin: -0.5rem auto 2rem;
}
.qsc-freq-count {
  text-align: center;
  color: var(--qsc-muted);
  font-size: 0.85rem;
  max-width: 44em;
  margin: -1.25rem auto 2rem;
  opacity: 0.85;
}
.qsc-freq-count-note {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--qsc-muted);
  letter-spacing: 0.02em;
}

.qsc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}
.qsc-card {
  background: var(--qsc-surface);
  border: 1px solid var(--qsc-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: border-color 0.2s, transform 0.2s;
}
.qsc-card:hover {
  border-color: var(--qsc-accent);
  transform: translateY(-2px);
}
.qsc-card .qsc-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}
.qsc-card p {
  font-size: 0.9rem;
  color: var(--qsc-muted);
  margin: 0 0 0.75rem;
}
.qsc-card p:last-child { margin-bottom: 0; }
.qsc-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--qsc-accent);
  margin-bottom: 0.5rem;
}

.qsc-freq-list {
  margin: 0.75rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.85rem;
  color: var(--qsc-muted);
}
.qsc-freq-list li {
  padding: 0.35rem 0;
  border-top: 1px solid var(--qsc-border);
}
.qsc-freq-list li:first-child { border-top: 0; }
.qsc-freq-list strong { color: var(--qsc-text); font-weight: 600; }

.qsc-freq-expand {
  margin-top: 0.75rem;
  border-top: 1px solid var(--qsc-border);
  padding-top: 0.5rem;
}
.qsc-freq-expand summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--qsc-accent);
  list-style: none;
  padding: 0.35rem 0;
  user-select: none;
}
.qsc-freq-expand summary::-webkit-details-marker { display: none; }
.qsc-freq-expand summary::before {
  content: '+ ';
  font-weight: 700;
}
.qsc-freq-expand[open] summary::before { content: '− '; }
.qsc-freq-expand[open] summary { margin-bottom: 0.35rem; }
.qsc-freq-scroll-hint {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  color: var(--qsc-muted);
  font-style: italic;
}
.qsc-freq-list-full {
  max-height: 16rem;
  overflow-y: auto;
  margin-top: 0.25rem;
  padding-right: 0.25rem;
}
.qsc-freq-expand--long .qsc-freq-list-full {
  max-height: min(28rem, 55vh);
}
.qsc-freq-list-full li { font-size: 0.82rem; }

.qsc-highlight {
  padding: 2rem 1.5rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(129, 140, 248, 0.04));
  border-top: 1px solid var(--qsc-border);
  border-bottom: 1px solid var(--qsc-border);
  text-align: center;
}
.qsc-highlight p {
  max-width: 48em;
  margin: 0 auto;
  font-size: 1rem;
  color: var(--qsc-muted);
}
.qsc-highlight-secondary {
  margin-top: 0.85rem !important;
  font-size: 0.92rem !important;
  opacity: 0.9;
}
.qsc-highlight strong { color: var(--qsc-text); }

/* Compact YouTube preview chip (hero) */
.qsc-video-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0.75rem 0.35rem 0.35rem;
  border-radius: 999px;
  background: var(--qsc-surface);
  border: 1px solid var(--qsc-border);
  color: var(--qsc-muted);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.15s;
}
.qsc-video-chip:hover {
  border-color: var(--qsc-accent);
  color: var(--qsc-text);
  text-decoration: none;
  transform: translateY(-1px);
}
.qsc-video-chip-thumb {
  position: relative;
  display: block;
  width: 3.25rem;
  height: 2.25rem;
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
}
.qsc-video-chip-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.qsc-video-chip-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.45);
  color: #fff;
  font-size: 0.65rem;
}
.qsc-video-chip-label { white-space: nowrap; }

/* Inline cropped screenshots */
.qsc-split {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: clamp(1.25rem, 4vw, 2.5rem);
  align-items: center;
  max-width: 52rem;
  margin: 0 auto 2.25rem;
  padding: 1.25rem 0;
}
.qsc-split--reverse { grid-template-columns: auto 1fr; }
.qsc-split-body h3 {
  font-size: 1.15rem;
  margin: 0 0 0.5rem;
}
.qsc-split-body p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--qsc-muted);
  max-width: 34em;
}

.qsc-shot {
  margin: 0;
  flex-shrink: 0;
}
.qsc-shot-frame {
  width: clamp(7.5rem, 18vw, 9.5rem);
  aspect-ratio: 9 / 13;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--qsc-border);
  background: #000;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
  position: relative;
}
.qsc-zoomable {
  cursor: zoom-in;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.qsc-zoomable::after {
  content: '';
  position: absolute;
  right: 0.45rem;
  bottom: 0.45rem;
  width: 1.65rem;
  height: 1.65rem;
  border-radius: 999px;
  background: rgba(10, 14, 23, 0.72)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23e2e8f0' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='M21 21l-4.35-4.35M11 8v6M8 11h6'/%3E%3C/svg%3E")
    center / 1rem no-repeat;
  border: 1px solid rgba(148, 163, 184, 0.35);
  pointer-events: none;
  opacity: 0.92;
}
.qsc-featured-banner.qsc-zoomable::after {
  right: 0.65rem;
  bottom: 0.65rem;
}
.qsc-zoomable:focus-visible {
  outline: 2px solid var(--qsc-accent);
  outline-offset: 3px;
}
.qsc-shot--wide .qsc-shot-frame {
  width: clamp(10rem, 28vw, 14rem);
  aspect-ratio: 4 / 3;
  border-radius: 10px;
}
.qsc-shot--compact .qsc-shot-frame {
  width: clamp(6rem, 14vw, 7.5rem);
}
.qsc-shot-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
/* Crop windows into full phone / tablet screenshots */
.qsc-crop-waves img { object-position: 50% 40%; }
.qsc-crop-waves-light img { object-position: 50% 40%; }
.qsc-crop-playlist img { object-position: 50% 28%; }
.qsc-crop-playlist-dark img { object-position: 50% 28%; }
.qsc-crop-controls img { object-position: 50% 78%; }
.qsc-crop-ipad img { object-position: 50% 42%; }

.qsc-shot-caption {
  margin-top: 0.45rem;
  text-align: center;
  font-size: 0.72rem;
  color: var(--qsc-muted);
}

.qsc-theme-row {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--qsc-border);
  text-align: center;
}
.qsc-theme-row-lead {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: var(--qsc-muted);
}
.qsc-shot-pair {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.qsc-details ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--qsc-muted);
  font-size: 0.95rem;
}
.qsc-details li { margin-bottom: 0.5rem; }
.qsc-details li strong { color: var(--qsc-text); }

.qsc-support-note {
  padding-top: 2rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--qsc-border);
  border-bottom: 1px solid var(--qsc-border);
  background: rgba(17, 24, 39, 0.35);
}
.qsc-support-note .qsc-section-lead {
  margin-bottom: 0;
}

.qsc-languages {
  border-top: 1px solid var(--qsc-border);
  border-bottom: 1px solid var(--qsc-border);
  background: rgba(17, 24, 39, 0.35);
}
.qsc-lang-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 0.65rem;
  max-width: 44rem;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}
.qsc-lang-list li {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--qsc-text);
  background: var(--qsc-surface);
  border: 1px solid var(--qsc-border);
}

.qsc-legal {
  max-width: 46rem;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
}
.qsc-legal h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin: 0 0 0.5rem;
}
.qsc-legal .qsc-updated {
  color: var(--qsc-muted);
  font-size: 0.9rem;
  margin: 0 0 2rem;
}
.qsc-legal h2 {
  font-size: 1.15rem;
  margin: 2rem 0 0.75rem;
}
.qsc-legal p,
.qsc-legal li {
  color: var(--qsc-muted);
  font-size: 0.95rem;
}
.qsc-legal ul { padding-left: 1.25rem; }
.qsc-legal li { margin-bottom: 0.45rem; }

.qsc-cta-footer {
  padding: 3rem 1.5rem;
  text-align: center;
  border-top: 1px solid var(--qsc-border);
}
.qsc-cta-footer p {
  color: var(--qsc-muted);
  margin: 0 0 1rem;
  font-size: 0.95rem;
}
.qsc-footer-note {
  padding: 0 1.5rem 2rem;
  text-align: center;
  color: var(--qsc-muted);
  font-size: 0.8rem;
}

/* Full-size screenshot lightbox */
body.qsc-lightbox-open {
  overflow: hidden;
}
.qsc-lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: max(0.75rem, env(safe-area-inset-top)) max(0.75rem, env(safe-area-inset-right))
    max(0.75rem, env(safe-area-inset-bottom)) max(0.75rem, env(safe-area-inset-left));
}
.qsc-lightbox[hidden] {
  display: none !important;
}
.qsc-lightbox-backdrop {
  position: absolute;
  inset: 0;
  border: 0;
  padding: 0;
  margin: 0;
  background: rgba(4, 7, 14, 0.88);
  backdrop-filter: blur(6px);
  cursor: zoom-out;
}
.qsc-lightbox-panel {
  position: relative;
  z-index: 1;
  width: min(100%, 56rem);
  max-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  pointer-events: none;
}
.qsc-lightbox-close {
  pointer-events: auto;
  align-self: flex-end;
  margin: 0 0 0.5rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid var(--qsc-border);
  background: rgba(17, 24, 39, 0.92);
  color: var(--qsc-text);
  font-size: 1.45rem;
  line-height: 1;
  cursor: pointer;
}
.qsc-lightbox-close:hover {
  background: var(--qsc-surface-hover);
}
.qsc-lightbox-figure {
  pointer-events: auto;
  margin: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--qsc-border);
  background: #000;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 4.5rem);
}
.qsc-lightbox-stage {
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  max-height: min(78vh, 920px);
  touch-action: pan-x pan-y pinch-zoom;
}
.qsc-lightbox-stage--zoomed {
  align-items: flex-start;
  justify-content: flex-start;
}
.qsc-lightbox-img {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: min(78vh, 920px);
  object-fit: contain;
  cursor: zoom-in;
  transform-origin: center center;
  transition: transform 0.15s ease-out;
}
.qsc-lightbox-stage--zoomed .qsc-lightbox-img {
  max-width: none;
  max-height: none;
  cursor: zoom-out;
}
.qsc-lightbox-caption {
  padding: 0.65rem 0.85rem;
  font-size: 0.82rem;
  color: var(--qsc-muted);
  text-align: center;
  border-top: 1px solid var(--qsc-border);
  background: rgba(17, 24, 39, 0.96);
}
.qsc-lightbox-hint {
  pointer-events: none;
  margin: 0.35rem 0 0;
  text-align: center;
  font-size: 0.72rem;
  color: var(--qsc-muted);
}

@media (max-width: 640px) {
  .qsc-site-header { flex-direction: column; align-items: flex-start; }
  .qsc-split,
  .qsc-split--reverse {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }
  .qsc-split-body p { margin: 0 auto; }
  .qsc-shot-frame {
    width: min(11.5rem, 42vw);
  }
  .qsc-shot--wide .qsc-shot-frame {
    width: min(16rem, 78vw);
  }
  .qsc-shot--compact .qsc-shot-frame {
    width: min(9.5rem, 38vw);
  }
}