/* STREAMING_CHUNK:Defining custom CSS variables and theme properties... */
:root {
  --bg-dark: #07090e;
  --bg-surface: #0f1420;
  --bg-panel: rgba(20, 26, 40, 0.75);
  --bg-panel-solid: #141a28;
  --bg-card: rgba(28, 36, 56, 0.6);
  --accent-cyan: #00f2fe;
  --accent-cyan-glow: rgba(0, 242, 254, 0.35);
  --accent-violet: #9d4edd;
  --accent-violet-glow: rgba(157, 78, 221, 0.35);
  --accent-amber: #ff9e00;
  --accent-rose: #ff2a6d;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --border-light: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 242, 254, 0.25);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-main: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px var(--accent-cyan-glow);
}

/* STREAMING_CHUNK:Applying base resets and typography rules... */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: 
    radial-gradient(circle at 15% 20%, rgba(157, 78, 221, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(0, 242, 254, 0.08) 0%, transparent 45%),
    var(--bg-dark);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* STREAMING_CHUNK:Styling main header and navigation bar... */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  padding: 0.75rem 1.5rem;
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 30%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background: rgba(157, 78, 221, 0.2);
  color: var(--accent-violet);
  border: 1px solid rgba(157, 78, 221, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.25);
}

.header-status {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.audio-engine-btn {
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.15), rgba(157, 78, 221, 0.15));
  border: 1px solid var(--border-glow);
  color: var(--text-main);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.audio-engine-btn:hover {
  box-shadow: var(--shadow-glow);
  border-color: var(--accent-cyan);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: background var(--transition-fast);
}

.status-dot.active {
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

/* STREAMING_CHUNK:Layout containers and utility grids... */
.main-wrapper {
  flex: 1;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.hero-banner {
  background: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
}

.hero-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), var(--accent-violet), transparent);
}

.hero-content {
  max-width: 760px;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.badge-cyan {
  background: rgba(0, 242, 254, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 242, 254, 0.3);
}

.badge-violet {
  background: rgba(157, 78, 221, 0.12);
  color: var(--accent-violet);
  border: 1px solid rgba(157, 78, 221, 0.3);
}

.grid-2col {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-3col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.grid-main-side {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 992px) {
  .grid-2col, .grid-3col, .grid-main-side {
    grid-template-columns: 1fr;
  }
}

/* STREAMING_CHUNK:Styling glassmorphism panels and cards... */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.75rem;
}

.panel-title {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-main);
}

.panel-title-icon {
  color: var(--accent-cyan);
}

/* STREAMING_CHUNK:Styling custom audio synth controls... */
.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.control-value {
  color: var(--accent-cyan);
  font-weight: 600;
}

.synth-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #1e293b;
  outline: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.synth-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-cyan);
  transition: transform var(--transition-fast);
}

.synth-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.synth-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: none;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-cyan);
}

.select-control {
  background: rgba(15, 20, 32, 0.9);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
  width: 100%;
  transition: border-color var(--transition-fast);
}

.select-control:focus {
  border-color: var(--accent-cyan);
}

.btn-group {
  display: flex;
  gap: 0.5rem;
}

.btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  text-decoration: none;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), #00b4d8);
  color: #000;
  border: none;
  font-weight: 700;
}

.btn-primary:hover {
  box-shadow: 0 0 15px var(--accent-cyan-glow);
  transform: translateY(-1px);
}

.btn-violet {
  background: linear-gradient(135deg, var(--accent-violet), #7209b7);
  color: #fff;
  border: none;
  font-weight: 700;
}

.btn-violet:hover {
  box-shadow: 0 0 15px var(--accent-violet-glow);
  transform: translateY(-1px);
}

.btn.active {
  background: rgba(0, 242, 254, 0.2);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* STREAMING_CHUNK:Styling visualizer canvas container and HUD elements... */
.canvas-wrapper {
  position: relative;
  width: 100%;
  height: 280px;
  background: #05070a;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.visualizer-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.hud-overlay {
  position: absolute;
  top: 10px;
  right: 10px;
  display: flex;
  gap: 0.5rem;
}

.hud-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid var(--border-light);
  color: var(--accent-cyan);
}

/* STREAMING_CHUNK:Styling virtual synthesizer keyboard... */
.keyboard-wrapper {
  background: #0a0d14;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  padding: 1rem;
  overflow-x: auto;
}

.keyboard {
  display: flex;
  justify-content: center;
  position: relative;
  height: 160px;
  user-select: none;
  min-width: 600px;
}

.key {
  position: relative;
  cursor: pointer;
  border-radius: 0 0 6px 6px;
  transition: background var(--transition-fast), transform var(--transition-fast);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
}

.key-white {
  width: 44px;
  height: 100%;
  background: linear-gradient(to bottom, #e2e8f0 0%, #cbd5e1 100%);
  color: #1e293b;
  border: 1px solid #94a3b8;
  z-index: 1;
  margin: 0 1px;
}

.key-white:hover {
  background: #f8fafc;
}

.key-white.active {
  background: var(--accent-cyan);
  color: #000;
  box-shadow: 0 0 15px var(--accent-cyan);
  transform: translateY(2px);
}

.key-black {
  width: 28px;
  height: 60%;
  background: linear-gradient(to bottom, #1e293b 0%, #0f172a 100%);
  color: #f8fafc;
  border: 1px solid #334155;
  z-index: 2;
  margin-left: -15px;
  margin-right: -15px;
}

.key-black:hover {
  background: #334155;
}

.key-black.active {
  background: var(--accent-violet);
  color: #fff;
  box-shadow: 0 0 15px var(--accent-violet);
  transform: translateY(2px);
}

/* STREAMING_CHUNK:Styling documentation and interactive calculator UI... */
.calc-card {
  background: rgba(15, 20, 32, 0.8);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.calc-input {
  width: 100%;
  background: rgba(7, 9, 14, 0.9);
  border: 1px solid var(--border-light);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  outline: none;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
}

.calc-input:focus {
  border-color: var(--accent-cyan);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.result-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
}

.result-val {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-amber);
}

/* STREAMING_CHUNK:Styling footer and clean status display... */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-light);
  background: rgba(7, 9, 14, 0.95);
  padding: 2rem 1.5rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-cyan);
}

/* STREAMING_CHUNK:Styling 404 error display... */
.error-container {
  text-align: center;
  padding: 4rem 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 6rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-rose));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 1rem;
}

.error-title {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.error-desc {
  color: var(--text-muted);
  margin-bottom: 2rem;
}