/* ============================================
   LUFS Scanner - Cyberpunk Theme
   ============================================ */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Rajdhani:wght@500;600;700&family=Space+Grotesk:wght@400;500;600&display=swap');

/* CSS Custom Properties */
:root {
  /* Neon Accents */
  --neon-cyan: #00f0ff;
  --neon-cyan-glow: rgba(0, 240, 255, 0.6);
  --neon-magenta: #ff00ff;
  --neon-green: #39ff14;
  --neon-amber: #ffbf00;

  /* Background Layers */
  --bg-void: #000000;
  --bg-deep: #0a0a0f;
  --bg-surface: #12121a;
  --bg-elevated: #1a1a25;
  --bg-card: #1f1f2e;

  /* Text Colors */
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --text-muted: #5a5a70;

  /* Primary accent */
  --color-accent: var(--neon-cyan);
  --color-accent-glow: var(--neon-cyan-glow);
  --color-success: var(--neon-green);
  --color-warning: var(--neon-amber);
  --color-error: #ff3366;

  /* Typography */
  --font-display: 'Rajdhani', 'Orbitron', sans-serif;
  --font-body: 'Space Grotesk', 'IBM Plex Sans', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Effects */
  --glow-sm: 0 0 5px var(--color-accent-glow), 0 0 10px var(--color-accent-glow);
  --glow-md: 0 0 10px var(--color-accent-glow), 0 0 20px var(--color-accent-glow);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);

  --transition: 200ms var(--ease-smooth);
}

/* Reset and Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-void);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Back Link */
.back-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted) !important;
  transition: color var(--transition), text-shadow var(--transition);
}

.back-link:hover {
  color: var(--color-accent) !important;
  text-shadow: 0 0 10px var(--color-accent-glow);
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 2rem;
}

.title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 2rem + 3vw, 4rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  color: var(--color-accent);
  text-shadow: var(--glow-md);
}

.subtitle {
  font-family: var(--font-mono);
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Main Content */
.main {
  flex: 1;
}

/* How It Works Section */
.how-it-works {
  margin-bottom: 2rem;
}

.steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.step {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--bg-elevated);
  padding: 0.75rem 1.25rem;
}

.step-number {
  width: 28px;
  height: 28px;
  background: transparent;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.875rem;
  box-shadow: var(--glow-sm);
}

.step-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.step-arrow {
  color: var(--color-accent);
}

@media (max-width: 700px) {
  .steps {
    flex-direction: column;
    gap: 0.75rem;
  }
  .step-arrow {
    transform: rotate(90deg);
  }
}

/* Upload Section */
.upload-section {
  margin-bottom: 2rem;
}

.upload-area {
  border: 1px solid var(--bg-elevated);
  background: var(--bg-surface);
  padding: 3rem 2rem;
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition);
  cursor: pointer;
  position: relative;
}

.upload-area::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid var(--color-accent);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.upload-area:hover,
.upload-area.drag-over {
  border-color: var(--color-accent);
  box-shadow: var(--glow-sm);
}

.upload-area:hover::before,
.upload-area.drag-over::before {
  opacity: 1;
}

.upload-icon {
  color: var(--color-accent);
  margin-bottom: 1rem;
  filter: drop-shadow(0 0 5px var(--color-accent-glow));
}

.upload-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.upload-subtext {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.upload-button {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: transparent;
  border: 1px solid var(--color-accent);
  padding: 0.75rem 2rem;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.upload-button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-accent);
  transform: translateX(-101%);
  transition: transform 0.3s var(--ease-smooth);
  z-index: -1;
}

.upload-button:hover {
  color: var(--bg-void);
  box-shadow: var(--glow-sm);
}

.upload-button:hover::before {
  transform: translateX(0);
}

.supported-formats {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-top: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* File Preview */
.file-preview {
  background-color: var(--bg-surface);
  border: 1px solid var(--bg-elevated);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.file-info {
  flex: 1;
  min-width: 200px;
}

.file-name {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  word-break: break-all;
  margin-bottom: 0.25rem;
  color: var(--color-accent);
}

.file-size {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.8rem;
}

.file-actions {
  display: flex;
  gap: 0.75rem;
}

.analyze-button {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--bg-void);
  background: var(--color-accent);
  border: 1px solid var(--color-accent);
  padding: 0.75rem 2rem;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--glow-sm);
}

.analyze-button:hover {
  box-shadow: var(--glow-md);
  transform: translateY(-2px);
}

.analyze-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.clear-button {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: transparent;
  color: var(--text-muted);
  border: 1px solid var(--bg-elevated);
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}

.clear-button:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
}

/* Progress Section */
.progress-section {
  margin-bottom: 2rem;
  padding: 2rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--bg-elevated);
}

.progress-container {
  background-color: var(--bg-void);
  border: 1px solid var(--bg-elevated);
  height: 8px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.progress-bar {
  height: 100%;
  background: var(--color-accent);
  box-shadow: var(--glow-sm);
  width: 0%;
  transition: width 100ms ease;
}

.progress-bar.analyzing {
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.progress-text {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

/* Results Section */
.results-section {
  animation: fadeIn 300ms ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.results-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  color: var(--color-accent);
  text-shadow: var(--glow-sm);
}

.results-filename {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: 1.5rem;
  word-break: break-all;
}

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

@media (max-width: 600px) {
  .measurements-grid {
    grid-template-columns: 1fr;
  }
}

.measurement-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--bg-elevated);
  padding: 1.25rem;
  text-align: center;
  transition: all var(--transition);
  position: relative;
}

.measurement-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid var(--color-accent);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.measurement-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.measurement-card:hover::before {
  opacity: 1;
}

.measurement-card.primary {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(0, 240, 255, 0.05) 100%);
  border: 1px solid var(--color-accent);
  box-shadow: var(--glow-sm);
}

@media (max-width: 600px) {
  .measurement-card.primary {
    grid-column: span 1;
  }
}

.measurement-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.measurement-value {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.measurement-card.primary .measurement-value {
  font-size: 3.5rem;
  color: var(--color-accent);
  text-shadow: var(--glow-sm);
}

.measurement-unit {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.measurement-description {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  opacity: 0.8;
}

/* LUFS Value Coloring */
.measurement-value.lufs-good {
  color: var(--color-success);
  text-shadow: 0 0 10px rgba(57, 255, 20, 0.5);
}

.measurement-value.lufs-warning {
  color: var(--color-warning);
  text-shadow: 0 0 10px rgba(255, 191, 0, 0.5);
}

.measurement-value.lufs-high {
  color: var(--color-error);
  text-shadow: 0 0 10px rgba(255, 51, 102, 0.5);
}

/* Audio Info */
.audio-info {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.8rem;
}

.audio-info-item:not(:empty)::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  box-shadow: 0 0 5px var(--color-accent-glow);
  margin-right: 0.5rem;
  vertical-align: middle;
}

/* Standards Badge */
.standards-badge {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.standards-badge span {
  font-family: var(--font-mono);
  background-color: rgba(57, 255, 20, 0.1);
  color: var(--color-success);
  padding: 0.25rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid rgba(57, 255, 20, 0.3);
}

.new-scan-button {
  display: block;
  width: 100%;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--bg-elevated);
  padding: 1rem;
  cursor: pointer;
  transition: all var(--transition);
}

.new-scan-button:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: var(--glow-sm);
}

/* Error Section */
.error-section {
  text-align: center;
  padding: 3rem 1rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--color-error);
  animation: fadeIn 300ms ease;
}

.error-icon {
  color: var(--color-error);
  margin-bottom: 1rem;
  filter: drop-shadow(0 0 10px rgba(255, 51, 102, 0.5));
}

.error-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  color: var(--color-error);
}

.error-message {
  font-family: var(--font-mono);
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.try-again-button {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  padding: 0.75rem 2rem;
  cursor: pointer;
  transition: all var(--transition);
}

.try-again-button:hover {
  background: var(--color-accent);
  color: var(--bg-void);
  box-shadow: var(--glow-sm);
}

/* Info Section */
.info-section {
  margin-top: 3rem;
  padding: 2rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--bg-elevated);
}

.info-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  color: var(--color-accent);
}

.info-text {
  font-family: var(--font-body);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

/* Platform Targets */
.platform-targets {
  margin-bottom: 1.5rem;
}

.targets-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.targets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
}

.target-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--bg-elevated);
  transition: border-color var(--transition);
}

.target-item:hover {
  border-color: var(--color-accent);
}

.target-name {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.target-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
}

/* Measurement Info */
.measurement-info {
  margin-top: 1.5rem;
}

.measurement-info-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.measurement-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.measurement-list li {
  font-family: var(--font-body);
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--bg-elevated);
}

.measurement-list li:last-child {
  border-bottom: none;
}

.measurement-list li strong {
  color: var(--color-accent);
}

/* Nerd Section */
.nerd-section {
  margin-top: 2rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--bg-elevated);
  overflow: hidden;
}

.nerd-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  transition: background-color var(--transition);
}

.nerd-header:hover {
  background-color: var(--bg-card);
}

.nerd-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-primary);
  margin: 0;
}

.nerd-icon {
  color: var(--neon-magenta);
  display: flex;
  filter: drop-shadow(0 0 5px rgba(255, 0, 255, 0.5));
}

.nerd-toggle {
  color: var(--text-muted);
  transition: transform var(--transition);
  display: flex;
}

.nerd-toggle.open {
  transform: rotate(180deg);
}

.nerd-content {
  padding: 0 1.5rem 1.5rem;
  display: none;
}

.nerd-content.open {
  display: block;
  animation: fadeIn 300ms ease;
}

.nerd-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
}

.nerd-card {
  background-color: var(--bg-card);
  border: 1px solid var(--bg-elevated);
  padding: 1.25rem;
}

.nerd-card-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--neon-magenta);
  margin: 0 0 0.75rem 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nerd-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nerd-list li {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--bg-elevated);
}

.nerd-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.nerd-list li strong {
  color: var(--text-primary);
}

@media (max-width: 600px) {
  .nerd-grid {
    grid-template-columns: 1fr;
  }

  .nerd-card[style*="grid-column: span 2"] {
    grid-column: span 1 !important;
  }
}

/* Code Blocks */
.code-block {
  background-color: var(--bg-void);
  border: 1px solid var(--bg-elevated);
  border-left: 3px solid var(--neon-cyan);
  padding: 1rem 1.25rem;
  margin: 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--text-secondary);
  white-space: pre;
  tab-size: 2;
}

.code-block code {
  font-family: inherit;
  color: inherit;
  background: none;
}

/* Syntax-like colors for readability */
.code-block {
  color: #a0a0b8;
}

/* Footer */
.footer {
  text-align: center;
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--bg-elevated);
}

/* Utility Classes */
.hidden {
  display: none !important;
}