/* Stratford Choir Rehearsal App - Complete Stylesheet */
/* Designed for accessibility (WCAG 2.1 AA compliant) and Vercel deployment */

:root {
  --primary-color: #2c5f89;
  --primary-dark: #1a3d5c;
  --primary-light: #4a87b8;
  --secondary-color: #8b4789;
  --accent-color: #d4af37;
  --text-color: #222;
  --text-light: #666;
  --bg-color: #ffffff;
  --bg-light: #f8f9fa;
  --border-color: #ddd;
  --success-color: #28a745;
  --error-color: #dc3545;
  --focus-color: #4a90e2;
  --transition: 0.2s ease;
}

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

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  overflow-x: hidden;
}

/* Accessibility - Visually Hidden (for screen readers) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip to Main Content Link (Accessibility) */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-color);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 100;
}

.skip-to-main:focus {
  top: 0;
}

/* Focus Styles for Keyboard Navigation */
*:focus {
  outline: 3px solid var(--focus-color);
  outline-offset: 2px;
}

button:focus,
a:focus,
input:focus {
  outline: 3px solid var(--focus-color);
  outline-offset: 2px;
}

/* Header Styles */
header {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  padding: 0.75rem 1.5rem 0.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.header-title {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

header h1 {
  font-size: 1.5rem;
  margin: 0;
  font-weight: 600;
}

.header-subtitle {
  font-size: 0.9rem;
  opacity: 0.85;
}

.back-link {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  text-decoration: none;
  border-radius: 4px;
  transition: background var(--transition);
  font-size: 0.9rem;
}

.back-link:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Header Controls Bar */
.header-controls-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  flex-wrap: nowrap;
  overflow-x: auto;
}

.header-controls-bar .button-group {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0;
}

.header-controls-bar .slider-container {
  flex: 0 0 auto;
  min-width: 150px;
  max-width: 180px;
  margin-bottom: 0;
}

.header-controls-bar .slider-container label {
  color: white;
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.header-controls-bar button {
  background: rgba(255, 255, 255, 0.9);
  color: var(--primary-dark);
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

.header-controls-bar button:hover:not(:disabled) {
  background: white;
  transform: translateY(-1px);
}

/* Landing Page Styles */
.landing-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.landing-page main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

/* Large Rehearse Button Card */
.big-rehearse-button {
  display: inline-block;
  padding: 12rem 24rem;
  background: #ffffff;
  color: #000000;
  font-size: 10.5rem;
  font-weight: 900;
  text-decoration: none;
  border-radius: 72px;
  box-shadow: 0 36px 120px rgba(0, 0, 0, 0.25);
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  text-align: center;
  letter-spacing: 0.1em;
}

.big-rehearse-button:hover {
  transform: translateY(-18px) scale(1.03);
  box-shadow: 0 48px 150px rgba(0, 0, 0, 0.35);
  background: #f0f0f0;
}

.big-rehearse-button:active {
  transform: translateY(-6px) scale(1.01);
}

.landing-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.landing-container main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.rehearse-button {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 3rem 4rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  font-size: 2rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.rehearse-button:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.rehearse-button .icon {
  font-size: 3rem;
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-light);
  background: var(--bg-light);
}

/* Main Container Layout */
.container {
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem;
  max-width: 1800px;
  margin: 0 auto;
}

/* Rehearse page layout tweaks for full-height sidebars */
body.rehearse-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

body.rehearse-page header {
  flex-shrink: 0;
}

body.rehearse-page .container {
  flex: 1;
  width: 100%;
  overflow: hidden;
}

body.rehearse-page .song-list {
  max-height: none;
  height: 100%;
}

body.rehearse-page .score-area {
  height: 100%;
}

body.rehearse-page .score-container {
  height: 100%;
}

body.rehearse-page .controls {
  position: relative;
  top: auto;
  height: 100%;
  max-height: none;
}

body.rehearse-page #scoreDisplay {
  height: 100%;
}

/* Song List Navigation */
.song-list {
  width: 280px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-height: calc(100vh - 200px);
  overflow-y: auto;
  padding-right: 0.5rem;
}

.song-list button {
  padding: 1rem;
  font-size: 1rem;
  background: white;
  color: var(--text-color);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
  font-weight: 500;
}

.song-list button:hover:not(:disabled) {
  background: var(--primary-light);
  color: white;
  border-color: var(--primary-light);
  transform: translateX(4px);
}

.song-list button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: var(--bg-light);
}

.song-list button:not(:disabled):active {
  transform: translateX(2px);
}

/* Score Area */
.score-area {
  flex: 1;
  min-width: 0;
  display: flex;
  gap: 1.5rem;
}

.score-container {
  display: flex;
  gap: 1.5rem;
  width: 100%;
}

/* Controls - Fixed on Left */
.controls {
  background: var(--bg-light);
  padding: 1.5rem;
  border-radius: 8px;
  width: 300px;
  flex-shrink: 0;
  position: sticky;
  top: 1.5rem;
  max-height: calc(100vh - 3rem);
  overflow-y: auto;
  align-self: flex-start;
}

/* Score Display - Scrollable on Right */
#scoreDisplay {
  flex: 1;
  background: white;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  overflow: auto;
  height: calc(100vh - 180px);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
}

/* Ensure OSMD content scales to fit container */
#scoreDisplay svg {
  width: auto;
  height: auto;
  max-width: none;
  display: block;
}

#scoreDisplay > div {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
}

/* Style OSMD cursor to highlight notes properly */
#scoreDisplay rect[fill="#33e033"],
#scoreDisplay rect[style*="rgb(51, 224, 51)"] {
  opacity: 0.5 !important;
  rx: 2 !important;
  ry: 2 !important;
}

.placeholder {
  color: var(--text-light);
  font-size: 1.1rem;
  text-align: center;
  padding: 3rem;
}

.controls h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-dark);
}

.controls h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

/* Button Group */
.button-group {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

/* Page Navigation */
.page-navigation {
  padding: 1rem;
  background: white;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  margin-bottom: 1.5rem;
}

.page-navigation h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  color: var(--primary-color);
}

.page-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.page-controls button {
  flex: 1;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
}

.page-controls span {
  font-weight: 600;
  color: var(--text-color);
  white-space: nowrap;
}

button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  font-weight: 500;
}

button:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

button:active:not(:disabled) {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.download-btn {
  background: var(--success-color);
}

.download-btn:hover {
  background: #218838;
}

/* AI Voice Toggle */
.ai-voice-toggle {
  padding: 1rem;
  background: white;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  margin-bottom: 1.5rem;
}

.ai-voice-toggle label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.1rem;
  font-weight: 500;
  cursor: pointer;
}

.ai-voice-toggle input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.help-text {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: 0.5rem;
  margin-left: 2rem;
}

/* Progress Indicator */
.progress-indicator {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--bg-light);
  border-radius: 6px;
  margin-top: 1rem;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Sliders */
.slider-container,
.seek-container {
  margin-bottom: 1.5rem;
}

.slider-container label,
.seek-container label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

input[type="range"] {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--border-color);
  outline: none;
  -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  transition: background var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
  background: var(--primary-dark);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  border: none;
}

/* Part Selector */
.part-selector {
  padding: 1rem;
  background: white;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  margin-bottom: 1.5rem;
}

.part-selector label {
  display: block;
  padding: 0.5rem;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition);
  border-radius: 4px;
}

.part-selector label:hover {
  background: var(--bg-light);
}

.part-selector input[type="checkbox"] {
  margin-right: 0.75rem;
  width: 18px;
  height: 18px;
  cursor: pointer;
}

/* Download Section */
.download-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--border-color);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .container {
    flex-direction: column;
  }

  body.rehearse-page {
    height: auto;
    overflow: auto;
  }

  body.rehearse-page .container {
    flex: initial;
    overflow: visible;
  }

  body.rehearse-page .song-list,
  body.rehearse-page .controls,
  body.rehearse-page .score-area,
  body.rehearse-page .score-container,
  body.rehearse-page #scoreDisplay {
    height: auto;
    max-height: none;
  }

  .song-list {
    width: 100%;
    max-height: none;
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 0.5rem;
  }

  .song-list button {
    min-width: 200px;
  }

  .score-area {
    flex-direction: column;
  }

  .score-container {
    flex-direction: column;
  }

  .controls {
    width: 100%;
    position: static;
    max-height: none;
  }

  header h1 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  header {
    padding: 1.5rem 1rem;
  }

  header h1 {
    font-size: 1.75rem;
  }

  .container {
    padding: 1rem;
    gap: 1rem;
  }

  .controls {
    padding: 1rem;
  }

  .rehearse-button {
    padding: 2rem 3rem;
    font-size: 1.5rem;
  }

  .big-rehearse-button {
    padding: 6rem 12rem;
    font-size: 6rem;
    border-radius: 40px;
    border-width: 8px;
  }

  .button-group {
    flex-direction: column;
  }

  .button-group button {
    width: 100%;
  }
}

/* Print Styles */
@media print {
  header,
  .song-list,
  .controls,
  footer {
    display: none;
  }

  .score-area {
    width: 100%;
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --primary-color: #000080;
    --border-color: #000;
    --text-color: #000;
  }

  button {
    border: 2px solid currentColor;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Dark Mode Support (Future Enhancement) */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --text-light: #999;
    --bg-light: #2a2a2a;
    --border-color: #444;
  }

  .score-container,
  .controls,
  .ai-voice-toggle,
  .part-selector {
    background: #2a2a2a;
  }

  .song-list button {
    background: #2a2a2a;
    color: #e0e0e0;
  }
}