/**
 * Phase 1 Web UI - Responsive Stylesheet
 */

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

:root {
  --primary-color: #2c3e50;
  --accent-color: #3498db;
  --success-color: #27ae60;
  --warning-color: #e74c3c;
  --light-bg: #ecf0f1;
  --light-text: #95a5a6;
  --border-color: #bdc3c7;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu,
    Cantarell, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: var(--primary-color);
}

.container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
}

/* ============================================================================
   HEADER
   ============================================================================ */

.header {
  background: white;
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.header h1 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.header .subtitle {
  font-size: 1.1rem;
  color: var(--light-text);
}

/* ============================================================================
   MAIN CONTENT
   ============================================================================ */

.main {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 2rem;
  flex: 1;
  padding: 0 2rem;
  margin-bottom: 2rem;
}

.panel {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  overflow-y: auto;
}

.panel h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
  border-bottom: 2px solid var(--accent-color);
  padding-bottom: 0.5rem;
}

/* ============================================================================
   SONG SELECTOR PANEL
   ============================================================================ */

.song-selector-panel {
  display: flex;
  flex-direction: column;
  max-height: 800px;
}

.search-box {
  position: relative;
  margin-bottom: 1.5rem;
}

.search-box input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.btn-clear {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--light-text);
  opacity: 0;
  transition: opacity 0.2s;
}

.search-box input:not(:placeholder-shown) ~ .btn-clear {
  opacity: 1;
}

.btn-clear:hover {
  color: var(--primary-color);
}

/* Song List */

.song-list-container {
  flex: 1;
  overflow-y: auto;
  border: 1px solid var(--light-bg);
  border-radius: 4px;
  margin-bottom: 1.5rem;
  max-height: 400px;
}

.song-item {
  padding: 0.75rem;
  border-bottom: 1px solid var(--light-bg);
  cursor: pointer;
  transition: background-color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.song-item:hover {
  background-color: var(--light-bg);
}

.song-item input[type='checkbox'] {
  cursor: pointer;
}

.song-item-content {
  flex: 1;
  min-width: 0;
}

.song-item-number {
  display: inline-block;
  background: var(--accent-color);
  color: white;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-size: 0.85rem;
  font-weight: bold;
  margin-right: 0.5rem;
}

.song-item-title {
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-item-lines {
  font-size: 0.85rem;
  color: var(--light-text);
}

.loading {
  text-align: center;
  padding: 2rem;
  color: var(--light-text);
}

/* Selected Songs */

.selected-songs {
  border-top: 2px solid var(--light-bg);
  padding-top: 1rem;
}

.selected-songs h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--primary-color);
}

.selected-list {
  list-style: none;
  margin-bottom: 1rem;
  max-height: 200px;
  overflow-y: auto;
}

.selected-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem;
  background: var(--light-bg);
  border-radius: 4px;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.selected-item-info {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.selected-item-remove {
  background: var(--warning-color);
  color: white;
  border: none;
  border-radius: 3px;
  padding: 0.25rem 0.5rem;
  cursor: pointer;
  font-size: 0.85rem;
  margin-left: 0.5rem;
}

.selected-item-remove:hover {
  opacity: 0.8;
}

/* ============================================================================
   PREVIEW PANEL
   ============================================================================ */

.preview-panel {
  display: flex;
  flex-direction: column;
  min-height: 600px;
  max-height: none;
}

.status-bar {
  padding: 0.75rem;
  border-radius: 4px;
  margin-bottom: 1rem;
  background: var(--light-bg);
  font-size: 0.9rem;
  color: var(--light-text);
}

.fill-info {
  margin-bottom: 1rem;
  padding: 0.75rem;
  background: #fef5e7;
  border-left: 4px solid #f39c12;
  border-radius: 4px;
  font-size: 0.9rem;
}

.fill-indicator {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

#pageStats {
  color: var(--primary-color);
  font-weight: bold;
}

.preview-container {
  flex: 1;
  overflow: auto;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: #f5f5f5;
  margin-bottom: 1rem;
  flex-direction: row;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-start;
  align-content: flex-start;
  padding: 1rem;
  gap: 1rem;
}

.preview-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--light-text);
  font-size: 1.1rem;
  text-align: center;
  padding: 2rem;
}

/* Embedded Preview Styles */

.preview-container .page {
  width: 7in;
  height: 9.5in;
  margin: 0;
  padding: 0.75in;
  background: white;
  border: 1px solid var(--border-color);
  column-count: 3;
  column-gap: 0.3in;
  page-break-after: always;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.preview-container .song {
  break-inside: avoid;
  margin-bottom: 12pt;
  font-size: 10.5pt;
}

.preview-container .song h2 {
  font-size: 13pt;
  font-weight: bold;
  border: none;
  padding: 0;
  margin: 0 0 4pt 0;
}

.preview-container .song p {
  font-style: italic;
  line-height: 1;
  margin: 0;
}

.preview-container .song p.verse-end {
  line-height: 1.5;
  margin-bottom: 6pt;
}

/* ============================================================================
   ACTIONS & BUTTONS
   ============================================================================ */

.actions {
  display: flex;
  gap: 1rem;
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--accent-color);
  color: white;
  flex: 1;
}

.btn-primary:hover {
  background: #2980b9;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-primary:disabled {
  background: var(--light-text);
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--light-bg);
  color: var(--primary-color);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: white;
}

/* ============================================================================
   ERROR DISPLAY
   ============================================================================ */

.error-display {
  background: #fadbd8;
  border-left: 4px solid var(--warning-color);
  border-radius: 4px;
  padding: 1rem;
  margin: 1rem 0;
}

.error-display h4 {
  color: var(--warning-color);
  margin-bottom: 0.5rem;
}

.error-display p {
  color: #c0392b;
  font-size: 0.9rem;
  margin: 0;
}

/* ============================================================================
   FOOTER
   ============================================================================ */

.footer {
  background: white;
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--light-text);
}

.footer p {
  margin: 0.5rem 0;
}

.footer-links a {
  color: var(--accent-color);
  text-decoration: none;
  margin: 0 0.25rem;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* ============================================================================
   MODAL
   ============================================================================ */

.modal {
  border: none;
  border-radius: 8px;
  padding: 0;
  max-width: 500px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.modal::backdrop {
  background: rgba(0, 0, 0, 0.5);
}

.modal-content {
  padding: 2rem;
}

.modal-content h2 {
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.modal-content p {
  margin: 0.5rem 0;
  font-size: 0.95rem;
}

.modal-content ul {
  margin-left: 1.5rem;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
}

.modal-content li {
  margin: 0.25rem 0;
  font-size: 0.9rem;
}

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 1024px) {
  .main {
    grid-template-columns: 300px 1fr;
    gap: 1.5rem;
    padding: 0 1rem;
  }

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

@media (max-width: 768px) {
  .main {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 0 1rem;
  }

  .song-selector-panel {
    max-height: 500px;
  }

  .panel {
    padding: 1rem;
  }

  .panel h2 {
    font-size: 1.25rem;
  }

  .header {
    padding: 1.5rem;
    margin-bottom: 1rem;
  }

  .header h1 {
    font-size: 1.75rem;
  }

  .actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .preview-container .page {
    width: 95%;
    margin: 0.5rem auto;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0;
  }

  .main {
    padding: 0;
  }

  .panel {
    border-radius: 0;
    padding: 1rem;
    max-height: none;
  }

  .header {
    padding: 1rem;
    margin-bottom: 0;
    border-radius: 0;
  }

  .header h1 {
    font-size: 1.5rem;
  }

  .header .subtitle {
    font-size: 0.95rem;
  }

  .song-item {
    padding: 0.5rem;
  }

  .search-box input {
    padding: 0.6rem;
    font-size: 16px; /* Prevent zoom on iOS */
  }

  .song-list-container {
    max-height: 300px;
  }

  .btn {
    padding: 0.6rem 1rem;
    font-size: 0.95rem;
  }
}

/* ============================================================================
   ANIMATIONS
   ============================================================================ */

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--light-bg);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ============================================================================
   PRINT STYLES
   ============================================================================ */

@media print {
  body {
    background: white;
  }

  .header,
  .song-selector-panel,
  .status-bar,
  .actions,
  .footer {
    display: none;
  }

  .main {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0;
    margin: 0;
  }

  .preview-panel {
    padding: 0;
    box-shadow: none;
  }

  .preview-container {
    border: none;
    margin: 0;
    padding: 0;
  }

  .preview-container .page {
    margin: 0;
    border: none;
    box-shadow: none;
    page-break-after: always;
  }
}


/* ===== PDF VIEWER STYLES ===== */

.pdf-viewer {
  display: flex;
  flex-direction: column;
  flex: 1;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: #f5f5f5;
  overflow: hidden;
}

.pdf-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  background: white;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.pdf-controls .btn-sm {
  padding: 6px 10px;
  font-size: 0.85rem;
  border: 1px solid var(--border-color);
  background: white;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.pdf-controls .btn-sm:hover {
  background: var(--light-bg);
  border-color: var(--primary-color);
}

.control-divider {
  color: #ccc;
  margin: 0 5px;
}

.scale-label {
  font-size: 0.9rem;
  color: var(--light-text);
  white-space: nowrap;
}

.zoom-select {
  padding: 6px 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.9rem;
  cursor: pointer;
  background: white;
  transition: all 0.2s;
}

.zoom-select:hover {
  border-color: var(--primary-color);
}

.page-info {
  font-size: 0.9rem;
  color: var(--light-text);
  white-space: nowrap;
  min-width: 80px;
  text-align: center;
}

.pdf-render {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 20px;
  gap: 20px;
  background: #525252;
}

.pdf-canvas {
  background: white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  max-width: 100%;
  height: auto;
}

.pdf-page {
  background: white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  margin: 0;
}

@media (max-width: 600px) {
  .pdf-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .pdf-controls .btn-sm,
  .zoom-select {
    width: 100%;
  }

  .scale-label {
    margin-top: 8px;
  }

  .control-divider {
    display: none;
  }
}

@media print {
  .pdf-viewer {
    border: none;
    background: white;
  }

  .pdf-controls {
    display: none;
  }

  .pdf-render {
    padding: 0;
    background: white;
  }
}