:root {
  --audio-text: #111827;
  --audio-muted: #6b7280;
  --audio-line: #e5e7eb;
  --audio-soft: #f8fafc;
  --audio-card: #ffffff;
  --audio-primary: #4f46e5;
  --audio-primary-dark: #3730a3;
  --audio-accent: #06b6d4;
  --audio-radius: 28px;
  --audio-shadow: 0 14px 34px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding-top: 72px;
  font-family: "Plus Jakarta Sans", sans-serif;
  color: var(--audio-text);
  background:
    radial-gradient(circle at 12% 10%, rgba(79, 70, 229, 0.08), transparent 22%),
    radial-gradient(circle at 88% 18%, rgba(6, 182, 212, 0.08), transparent 20%),
    #fff;
}

.audio-container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.audio-hero {
  margin: 24px auto 34px;
  padding: 48px;
  border-radius: 42px;
  color: #fff;
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 48%, #155e75 100%);
  box-shadow: 0 36px 90px -28px rgba(49, 46, 129, 0.45);
  overflow: hidden;
  position: relative;
}

.audio-hero::after {
  content: "";
  position: absolute;
  inset: auto -80px -120px auto;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  filter: blur(20px);
}

.audio-hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.audio-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #cffafe;
  margin-bottom: 18px;
}

.audio-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(2.3rem, 5vw, 4rem);
  line-height: 1.05;
  font-weight: 800;
}

.audio-hero p {
  margin: 0;
  max-width: 680px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.08rem;
  line-height: 1.7;
}

.audio-section-stats {
  margin: 0 auto 34px;
}

.audio-stat-row {
  display: flex;
  justify-content: center;
  gap: 44px;
  flex-wrap: wrap;
  margin-bottom: 22px;
  text-align: center;
}

.audio-stat-value {
  display: block;
  color: #0f172a;
  font-size: 30px;
  line-height: 1;
  font-weight: 800;
}

.audio-stat-label {
  display: block;
  margin-top: 6px;
  color: #475569;
  font-size: 13px;
  font-weight: 700;
}

.audio-chip-row {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.audio-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid #dbe4f0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  color: #475569;
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.05);
}

.audio-chip i {
  width: 18px;
  height: 18px;
  color: var(--audio-primary);
}

.audio-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 70px;
}

.audio-seo-panel {
  margin: 0 0 78px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #eef2f7;
  border-radius: var(--audio-radius);
  box-shadow: var(--audio-shadow);
  padding: clamp(24px, 4vw, 42px);
}

.audio-seo-panel h2 {
  margin: 0 0 12px;
  color: #0f172a;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.audio-seo-panel > p {
  max-width: 880px;
  color: #475569;
  line-height: 1.8;
  font-size: 15px;
  font-weight: 600;
}

.audio-seo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 26px;
}

.audio-seo-card,
.audio-faq-item {
  border: 1px solid #e2e8f0;
  border-radius: 18px;
  background: #fff;
  padding: 18px;
}

.audio-seo-card {
  background: var(--audio-soft);
}

.audio-seo-card h3,
.audio-faq-item h3 {
  margin: 0 0 8px;
  color: #0f172a;
  font-size: 15px;
}

.audio-seo-card p,
.audio-faq-item p {
  margin: 0;
  color: #64748b;
  line-height: 1.7;
  font-size: 13px;
  font-weight: 600;
}

.audio-faq-list {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.audio-tool-card,
.audio-panel {
  background: var(--audio-card);
  border: 1px solid #eef2f7;
  border-radius: var(--audio-radius);
  box-shadow: var(--audio-shadow);
}

.audio-tool-card {
  display: flex;
  flex-direction: column;
  min-height: 230px;
  padding: 24px;
  color: inherit;
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.audio-tool-card:hover {
  transform: translateY(-4px);
  border-color: rgba(79, 70, 229, 0.28);
  box-shadow: 0 20px 46px rgba(15, 23, 42, 0.12);
}

.audio-card-icon,
.tool-header-icon {
  width: 54px;
  height: 54px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: #eef2ff;
  color: var(--audio-primary);
}

.audio-card-icon i,
.tool-header-icon i { width: 28px; height: 28px; }

.audio-tool-card h2 {
  margin: 20px 0 10px;
  font-size: 21px;
  letter-spacing: -0.02em;
}

.audio-tool-card p,
.audio-note,
.audio-panel p {
  color: var(--audio-muted);
  line-height: 1.65;
}

.audio-status {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #155e75;
  font-weight: 800;
  font-size: 13px;
}

.tool-shell { padding-bottom: 72px; }

.breadcrumb {
  padding: 24px 0 0;
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--audio-muted);
  font-size: 14px;
}

.breadcrumb a {
  color: var(--audio-primary);
  text-decoration: none;
  font-weight: 700;
}

.breadcrumb i { width: 14px; height: 14px; }

.audio-panel { padding: 34px; margin-bottom: 22px; }

.tool-seo-panel {
  margin: 22px 0 70px;
  padding: clamp(24px, 4vw, 38px);
}

.tool-seo-panel h2 {
  margin: 0 0 12px;
  color: #0f172a;
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  line-height: 1.15;
}

.tool-seo-panel > p {
  max-width: 860px;
  margin: 0;
  color: #475569;
  line-height: 1.8;
  font-size: 15px;
  font-weight: 600;
}

.tool-info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.tool-info-card,
.tool-faq-item {
  border: 1px solid #e2e8f0;
  border-radius: 18px;
  padding: 18px;
  background: #fff;
}

.tool-info-card {
  background: var(--audio-soft);
}

.tool-info-card h3,
.tool-faq-item h3 {
  margin: 0 0 8px;
  color: #0f172a;
  font-size: 15px;
}

.tool-info-card p,
.tool-faq-item p {
  margin: 0;
  color: #64748b;
  line-height: 1.7;
  font-size: 13px;
  font-weight: 600;
}

.tool-faq-list {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.tool-header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 28px;
}

.tool-header h1 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  letter-spacing: -0.03em;
}

.tool-header p { margin: 6px 0 0; }

.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: 22px;
  align-items: start;
}

.dropzone {
  display: grid;
  place-items: center;
  min-height: 230px;
  padding: 28px;
  text-align: center;
  border: 2px dashed #cbd5e1;
  border-radius: 24px;
  background: var(--audio-soft);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.dropzone:hover,
.dropzone.drag-over {
  border-color: var(--audio-primary);
  background: #eef2ff;
}

.dropzone input { display: none; }

.dropzone i {
  width: 46px;
  height: 46px;
  color: var(--audio-primary);
  margin-bottom: 14px;
}

.dropzone h2 {
  margin: 0 0 8px;
  font-size: 22px;
}

.control-stack {
  display: grid;
  gap: 16px;
}

.control-group {
  display: grid;
  gap: 8px;
}

.control-group label,
.metric-label {
  color: #334155;
  font-size: 13px;
  font-weight: 800;
}

input[type="range"],
input[type="number"],
select {
  width: 100%;
}

input[type="number"],
select {
  min-height: 42px;
  padding: 10px 12px;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  background: #fff;
  color: #0f172a;
  font: inherit;
}

audio {
  width: 100%;
  margin: 14px 0 4px;
}

audio[hidden] {
  display: none;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.audio-btn {
  border: 0;
  min-height: 44px;
  padding: 11px 16px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  color: #fff;
  background: var(--audio-primary);
  transition: transform 0.2s ease, background 0.2s ease, opacity 0.2s ease;
}

.audio-btn:hover { transform: translateY(-1px); background: var(--audio-primary-dark); }
.audio-btn:disabled { cursor: not-allowed; opacity: 0.55; transform: none; }
.audio-btn.secondary { background: #0f172a; }
.audio-btn.ghost { background: #eef2ff; color: var(--audio-primary); }
.audio-btn.danger { background: #dc2626; }

.file-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.file-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid #e2e8f0;
  border-radius: 14px;
  background: #fff;
  color: #334155;
  font-size: 14px;
}

.file-item strong {
  color: #0f172a;
  word-break: break-word;
}

.file-item span {
  display: block;
  color: var(--audio-muted);
  font-size: 12px;
  margin-top: 4px;
}

.lab-file-item {
  align-items: center;
}

.lab-file-item select {
  width: 150px;
  flex: 0 0 150px;
}

.quality-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  padding: 8px 12px;
  border-radius: 999px;
  background: #f0fdf4;
  color: #166534;
  font-weight: 800;
  font-size: 13px;
}

.eq-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
  padding: 12px;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  background: #f8fafc;
}

.eq-grid label {
  display: grid;
  gap: 8px;
  justify-items: center;
  color: #334155;
  font-size: 12px;
  font-weight: 800;
}

.eq-grid input[type="range"] {
  width: 72px;
  transform: rotate(-90deg);
  transform-origin: center;
  margin: 28px 0;
}

@media (max-width: 720px) {
  .eq-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.metric {
  padding: 14px;
  border: 1px solid #eef2f7;
  border-radius: 18px;
  background: #fbfdff;
}

.metric-value {
  margin-top: 4px;
  font-size: 15px;
  font-weight: 800;
  word-break: break-word;
}

.audio-result {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 14px;
  background: #ecfeff;
  color: #155e75;
  font-weight: 700;
  display: none;
}

.audio-result.is-visible { display: block; }

.audio-progress {
  display: none;
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid #dbeafe;
  background: #f8fbff;
}

.audio-progress.is-visible {
  display: block;
}

.audio-progress-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  color: #334155;
  font-size: 13px;
  font-weight: 800;
}

.audio-progress-track {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: #e2e8f0;
}

.audio-progress-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--audio-primary), var(--audio-accent));
  transition: width 0.18s ease;
}

.canvas-meter {
  width: 100%;
  height: 86px;
  border-radius: 18px;
  border: 1px solid #e2e8f0;
  background: #0f172a;
}

.panner-pad {
  position: relative;
  aspect-ratio: 1;
  max-width: 360px;
  margin: 0 auto;
  border-radius: 28px;
  background:
    linear-gradient(#e2e8f0 1px, transparent 1px),
    linear-gradient(90deg, #e2e8f0 1px, transparent 1px),
    #f8fafc;
  background-size: 25% 25%;
  border: 1px solid #e2e8f0;
}

.panner-dot {
  position: absolute;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--audio-primary);
  box-shadow: 0 12px 22px rgba(79, 70, 229, 0.34);
  transform: translate(-50%, -50%);
  left: 50%;
  top: 50%;
}

@media (max-width: 900px) {
  .audio-hero { padding: 34px 24px; border-radius: 30px; }
  .audio-grid,
  .workspace-grid,
  .audio-seo-grid,
  .tool-info-grid { grid-template-columns: 1fr; }
  .audio-panel { padding: 24px; }
}

@media (max-width: 560px) {
  .audio-stat-row { gap: 18px; }
  .audio-stat-value { font-size: 24px; }
  .audio-chip { width: calc(50% - 6px); justify-content: center; padding: 0 12px; }
  .metric-grid { grid-template-columns: 1fr; }
  .tool-header { align-items: flex-start; }
}