:root {
  --bg-page: hsl(28, 22%, 6.5%);
  --bg-surface: hsl(28, 18%, 10%);
  --bg-elevated: hsl(28, 16%, 13.5%);
  --bg-stage: hsl(26, 26%, 5%);

  --ink-primary: hsl(38, 30%, 95%);
  --ink-secondary: hsl(34, 14%, 70%);
  --ink-muted: hsl(32, 10%, 48%);

  --accent: hsl(39, 90%, 54%);
  --accent-hover: hsl(41, 94%, 60%);
  --accent-soft: hsla(39, 90%, 54%, 0.13);
  --spike-red: hsl(12, 84%, 62%);

  --border-subtle: hsla(38, 28%, 82%, 0.09);
  --border-strong: hsla(38, 34%, 76%, 0.19);

  --shadow-card: 0 14px 36px -12px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 245, 225, 0.04);
  --shadow-btn: 0 4px 18px rgba(235, 162, 36, 0.24);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-page);
  color: var(--ink-primary);
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.site-header {
  background: hsla(28, 22%, 7.5%, 0.94);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 0.68rem;
  text-decoration: none;
  color: var(--ink-primary);
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: linear-gradient(145deg, hsl(41, 90%, 54%), hsl(28, 84%, 40%));
  color: #1a0f02;
  display: grid;
  place-items: center;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.brand-name {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.025em;
}

.brand-tag {
  font-size: 0.76rem;
  color: var(--ink-muted);
  font-weight: 500;
  padding-left: 0.65rem;
  border-left: 1px solid var(--border-strong);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

.header-nav a {
  color: var(--ink-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.header-nav a:hover {
  color: var(--ink-primary);
}

.privacy-indicator {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.73rem;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid hsla(39, 90%, 54%, 0.28);
  padding: 0.3rem 0.68rem;
  border-radius: 6px;
  font-weight: 500;
}

.main-wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 1.85rem 1.5rem 4rem;
}

.hero-intro {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.hero-copy h1 {
  margin: 0 0 0.45rem;
  font-size: clamp(1.8rem, 3.1vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.032em;
  line-height: 1.13;
  color: var(--ink-primary);
}

.hero-copy h1 em {
  font-family: 'Instrument Serif', Georgia, serif;
  font-weight: 400;
  font-style: italic;
  color: var(--accent);
  font-size: 1.08em;
}

.hero-copy p {
  margin: 0;
  color: var(--ink-secondary);
  max-width: 670px;
  font-size: 0.97rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-primary {
  appearance: none;
  border: none;
  background: var(--accent);
  color: #191003;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.91rem;
  padding: 0.74rem 1.28rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: var(--shadow-btn);
  transition: background 0.15s ease, transform 0.12s ease;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  appearance: none;
  border: 1px solid var(--border-strong);
  background: var(--bg-elevated);
  color: var(--ink-primary);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.86rem;
  padding: 0.66rem 1.02rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn-secondary:hover {
  background: hsl(28, 16%, 17.5%);
  border-color: hsla(39, 90%, 58%, 0.38);
}

.ad-slot-leaderboard {
  width: 100%;
  min-height: 90px;
  background: var(--bg-surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--ink-muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.73rem;
  letter-spacing: 0.04em;
}

.studio-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 365px;
  gap: 1.35rem;
  align-items: start;
}

@media (max-width: 980px) {
  .studio-grid {
    grid-template-columns: 1fr;
  }
  .brand-tag {
    display: none;
  }
}

.stage-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.stage-toolbar {
  padding: 0.85rem 1.15rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.transport-cluster {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.play-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #191003;
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: var(--shadow-btn);
  transition: transform 0.12s ease, background 0.15s ease;
}

.play-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.04);
}

.ab-segmented {
  display: inline-flex;
  background: var(--bg-stage);
  padding: 3px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
}

.ab-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--ink-secondary);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.42rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.14s ease, color 0.14s ease;
}

.ab-btn.active-orig {
  background: hsla(12, 84%, 62%, 0.22);
  color: hsl(12, 90%, 76%);
}

.ab-btn.active-clean {
  background: var(--accent);
  color: #191003;
}

.time-readout {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.77rem;
  color: var(--ink-secondary);
  min-width: 96px;
}

.telemetry-badges {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.metric-pill {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.73rem;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--ink-secondary);
}

.metric-pill strong {
  color: var(--accent);
  font-weight: 600;
}

.waveform-viewport {
  position: relative;
  width: 100%;
  height: 330px;
  background: var(--bg-stage);
  cursor: pointer;
  user-select: none;
  overflow: hidden;
}

.waveform-viewport.drag-over {
  outline: 2px solid var(--accent);
  outline-offset: -5px;
  background: hsl(32, 24%, 8%);
}

#waveCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.lane-tag {
  position: absolute;
  left: 14px;
  padding: 0.24rem 0.58rem;
  border-radius: 5px;
  font-size: 0.71rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  pointer-events: none;
  background: rgba(14, 10, 6, 0.86);
  border: 1px solid var(--border-subtle);
}

.lane-tag.top {
  top: 22px;
  color: hsl(12, 86%, 72%);
}

.lane-tag.bottom {
  top: 178px;
  color: var(--accent);
}

.marker-legend {
  position: absolute;
  right: 14px;
  top: 22px;
  padding: 0.24rem 0.6rem;
  border-radius: 5px;
  font-size: 0.7rem;
  font-weight: 600;
  color: hsl(41, 95%, 74%);
  background: rgba(18, 13, 6, 0.86);
  border: 1px solid hsla(39, 90%, 54%, 0.28);
  pointer-events: none;
}

.drop-hint-bar {
  padding: 0.65rem 1.15rem;
  background: hsla(28, 20%, 11%, 0.85);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.79rem;
  color: var(--ink-muted);
}

.processing-overlay {
  position: absolute;
  inset: 0;
  background: rgba(12, 9, 5, 0.8);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  color: var(--ink-primary);
  font-weight: 600;
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.16s ease;
}

.processing-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.spinner-ring {
  width: 28px;
  height: 28px;
  border: 3px solid rgba(245, 174, 42, 0.22);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.demo-strip {
  padding: 0.9rem 1.15rem;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.demo-items {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.toolbar-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-secondary);
}

.demo-chip {
  appearance: none;
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  color: var(--ink-primary);
  font-family: inherit;
  font-size: 0.79rem;
  font-weight: 600;
  padding: 0.45rem 0.82rem;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  transition: border-color 0.14s ease, background 0.14s ease;
}

.demo-chip:hover {
  border-color: var(--accent);
}

.demo-chip.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: hsl(42, 95%, 76%);
}

.controls-panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.control-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.2rem;
  box-shadow: var(--shadow-card);
}

.card-heading {
  margin: 0 0 0.95rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.reset-link {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}

.reset-link:hover {
  text-decoration: underline;
}

.slider-group {
  margin-bottom: 0.92rem;
}

.slider-group:last-child {
  margin-bottom: 0;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.81rem;
  margin-bottom: 0.32rem;
}

.slider-header label {
  font-weight: 600;
  color: var(--ink-primary);
}

.slider-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

.action-stack {
  display: flex;
  flex-direction: column;
  gap: 0.62rem;
}

.action-stack .btn-primary,
.action-stack .btn-secondary {
  width: 100%;
}

.export-note {
  margin: 0.15rem 0 0;
  text-align: center;
  font-size: 0.74rem;
  color: var(--ink-muted);
}

.ad-slot-rectangle {
  width: 100%;
  min-height: 250px;
  background: var(--bg-surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.73rem;
  text-align: center;
  padding: 1rem;
}

.seo-section {
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border-subtle);
}

.seo-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
  margin-bottom: 2.4rem;
}

@media (max-width: 820px) {
  .seo-columns {
    grid-template-columns: 1fr;
  }
}

.seo-feature {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.35rem;
}

.seo-feature h2 {
  margin: 0 0 0.5rem;
  font-size: 1.04rem;
  letter-spacing: -0.015em;
  color: var(--ink-primary);
}

.seo-feature p {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 0.9rem;
}

.faq-wrap {
  max-width: 840px;
}

.faq-wrap h2 {
  font-size: 1.32rem;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

details.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.92rem 1.15rem;
  margin-bottom: 0.65rem;
}

details.faq-item summary {
  font-weight: 600;
  cursor: pointer;
  color: var(--ink-primary);
}

details.faq-item p {
  margin: 0.6rem 0 0;
  color: var(--ink-secondary);
  font-size: 0.9rem;
}