/* Signal Chain Optimizer - Main Stylesheet */
:root {
  --color-bg: #0f0f14;
  --color-bg-secondary: #1a1a24;
  --color-bg-tertiary: #242436;
  --color-surface: #2a2a3d;
  --color-surface-hover: #35354d;
  --color-border: #3a3a52;
  --color-text: #e8e8f0;
  --color-text-secondary: #a0a0b8;
  --color-text-muted: #6a6a82;
  --color-primary: #6366f1;
  --color-primary-hover: #818cf8;
  --color-primary-dim: rgba(99, 102, 241, 0.15);
  --color-accent: #f59e0b;
  --color-accent-dim: rgba(245, 158, 11, 0.15);
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-gain: #ef4444;
  --color-dynamics: #3b82f6;
  --color-modulation: #8b5cf6;
  --color-time: #06b6d4;
  --color-filter: #f59e0b;
  --color-utility: #6b7280;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
  --transition: 0.2s ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.1rem;
}

.main-nav {
  display: flex;
  gap: 24px;
}

.main-nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--transition);
}

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

/* Hero */
.hero-section {
  padding: 60px 0 40px;
  text-align: center;
}

.hero-section h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Optimizer Section */
.optimizer-section {
  padding: 20px 0 60px;
}

.optimizer-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 32px;
  align-items: start;
}

/* Controls */
.optimizer-controls {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.setup-panel {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.setup-panel h2 {
  font-size: 1.2rem;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 16px;
}

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

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group select,
.form-group input {
  width: 100%;
  padding: 12px 16px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  transition: border-color var(--transition);
}

.form-group select:focus,
.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-dim);
}

/* Pedal Catalog */
.pedal-catalog {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.pedal-catalog h3 {
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.pedal-categories {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pedal-category h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.pedal-category {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pedal-btn {
  padding: 8px 14px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.pedal-btn:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
}

.pedal-btn[data-category="dynamics"] { border-left: 3px solid var(--color-dynamics); }
.pedal-btn[data-category="gain"] { border-left: 3px solid var(--color-gain); }
.pedal-btn[data-category="modulation"] { border-left: 3px solid var(--color-modulation); }
.pedal-btn[data-category="time"] { border-left: 3px solid var(--color-time); }
.pedal-btn[data-category="filter"] { border-left: 3px solid var(--color-filter); }
.pedal-btn[data-category="utility"] { border-left: 3px solid var(--color-utility); }

.custom-pedal {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.custom-pedal label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.custom-pedal-input {
  display: flex;
  gap: 8px;
}

.custom-pedal-input input {
  flex: 1;
  padding: 10px 14px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.9rem;
  font-family: var(--font-sans);
}

.custom-pedal-input select {
  padding: 10px 12px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.85rem;
  font-family: var(--font-sans);
}

.custom-pedal-input button {
  padding: 10px 18px;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
  font-family: var(--font-sans);
}

.custom-pedal-input button:hover {
  background: var(--color-primary-hover);
}

/* Action Buttons */
.action-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-primary {
  flex: 1;
  padding: 14px 24px;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  padding: 14px 20px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
}

/* Preset Modal */
.preset-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  backdrop-filter: blur(4px);
}

.preset-modal[hidden] {
  display: none;
}

.modal-content {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 400px;
  width: 90%;
}

.modal-content h3 {
  margin-bottom: 20px;
}

.preset-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.preset-btn {
  padding: 14px 18px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.95rem;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.preset-btn:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
}

/* Chain Display */
.chain-display {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: sticky;
  top: 90px;
}

.chain-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.chain-header h2 {
  font-size: 1.2rem;
}

.chain-actions {
  display: flex;
  gap: 8px;
}

.btn-icon {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.btn-icon:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
  border-color: var(--color-primary);
}

/* Chain Diagram */
.chain-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 20px 0;
}

.chain-start,
.chain-end {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
}

.chain-label {
  white-space: nowrap;
}

.chain-arrow {
  width: 2px;
  height: 24px;
  background: var(--color-border);
  position: relative;
}

.chain-arrow::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 8px solid var(--color-border);
}

.chain-pedals {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  min-height: 60px;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 40px;
  color: var(--color-text-muted);
  text-align: center;
}

.empty-state p {
  font-size: 0.9rem;
}

/* Pedal Cards in Chain */
.pedal-card {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: 400px;
  padding: 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: grab;
  transition: all var(--transition);
  position: relative;
}

.pedal-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.pedal-card.dragging {
  opacity: 0.5;
  cursor: grabbing;
}

.pedal-card.drag-over {
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
}

.pedal-position {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-muted);
  min-width: 24px;
  text-align: center;
}

.pedal-info {
  flex: 1;
}

.pedal-name {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.pedal-category-tag {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.pedal-card[data-category="dynamics"] { border-left: 4px solid var(--color-dynamics); }
.pedal-card[data-category="gain"] { border-left: 4px solid var(--color-gain); }
.pedal-card[data-category="modulation"] { border-left: 4px solid var(--color-modulation); }
.pedal-card[data-category="time"] { border-left: 4px solid var(--color-time); }
.pedal-card[data-category="filter"] { border-left: 4px solid var(--color-filter); }
.pedal-card[data-category="utility"] { border-left: 4px solid var(--color-utility); }

.pedal-remove {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all var(--transition);
  font-size: 1.2rem;
  line-height: 1;
}

.pedal-remove:hover {
  color: var(--color-error);
  background: rgba(239, 68, 68, 0.1);
}

.pedal-explanation {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
  line-height: 1.5;
}

/* Chain Notes */
.chain-notes {
  margin-top: 20px;
  padding: 16px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.chain-notes:empty {
  display: none;
}

/* Explanation Section */
.explanation-section {
  padding: 60px 0;
  background: var(--color-bg-secondary);
}

.explanation-section h2 {
  font-size: 1.8rem;
  margin-bottom: 32px;
  text-align: center;
}

.explanation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.explanation-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.explanation-card h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--color-primary-hover);
}

.explanation-card p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Common Swaps Section */
.common-swaps-section {
  padding: 60px 0;
}

.common-swaps-section h2 {
  font-size: 1.8rem;
  margin-bottom: 32px;
  text-align: center;
}

.swaps-table-container {
  overflow-x: auto;
}

.swaps-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.swaps-table th {
  text-align: left;
  padding: 14px 16px;
  background: var(--color-bg-secondary);
  border-bottom: 2px solid var(--color-border);
  font-weight: 600;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.swaps-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.swaps-table tr:hover td {
  background: var(--color-bg-secondary);
}

.swaps-table td:first-child {
  font-weight: 600;
  white-space: nowrap;
}

/* Tips Section */
.tips-section {
  padding: 60px 0;
  background: var(--color-bg-secondary);
}

.tips-section h2 {
  font-size: 1.8rem;
  margin-bottom: 32px;
  text-align: center;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.tip-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.tip-card h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--color-accent);
}

.tip-card p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* FAQ Section */
.faq-section {
  padding: 60px 0;
}

.faq-section h2 {
  font-size: 1.8rem;
  margin-bottom: 32px;
  text-align: center;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item summary {
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--color-primary);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-item summary:hover {
  background: var(--color-bg-tertiary);
}

.faq-item p {
  padding: 0 24px 18px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Footer */
.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: 40px 0 24px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  font-weight: 700;
  font-size: 1.1rem;
  display: block;
  margin-bottom: 8px;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-primary-hover);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-bottom p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 14px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  z-index: 300;
  animation: slideIn 0.3s ease;
}

.toast.success {
  border-color: var(--color-success);
}

@keyframes slideIn {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Print Styles */
@media print {
  .site-header,
  .optimizer-controls,
  .chain-actions,
  .site-footer,
  .explanation-section,
  .tips-section,
  .faq-section {
    display: none;
  }

  .chain-display {
    position: static;
    border: none;
    padding: 0;
  }

  .pedal-card {
    break-inside: avoid;
    border: 1px solid #ccc;
  }

  body {
    background: white;
    color: black;
  }
}

/* Responsive */
@media (max-width: 900px) {
  .optimizer-layout {
    grid-template-columns: 1fr;
  }

  .chain-display {
    position: static;
  }

  .hero-section h1 {
    font-size: 2rem;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
  }
}

@media (max-width: 600px) {
  .container {
    padding: 0 16px;
  }

  .hero-section {
    padding: 40px 0 30px;
  }

  .hero-section h1 {
    font-size: 1.6rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .pedal-category {
    flex-direction: column;
  }

  .pedal-btn {
    width: 100%;
    text-align: left;
  }

  .custom-pedal-input {
    flex-direction: column;
  }

  .action-buttons {
    flex-direction: column;
  }

  .chain-header {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }

  .chain-actions {
    width: 100%;
    justify-content: space-between;
  }

  .main-nav {
    gap: 16px;
  }

  .main-nav a {
    font-size: 0.85rem;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 16px;
  }
}


/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}