/* --- "Deep Night" Dark Theme --- */

/* 1. Root Variables & Base Styles */
:root {
  /* Deep Dark Palette */
  --bg-primary: #111827;      /* slate-900 for page background */
  --bg-secondary: #1f2937;    /* slate-800 for cards, lists */
  --surface-card: #374151;    /* slate-700 for individual song cards */
  --surface-hover: #4b5563;   /* slate-600 for hover states */
  --border-color: #4b5563;    /* slate-600 for borders */
  --header-bg: #030712;       /* slate-950 for list headers */
  
  --text-primary: #f3f4f6;    /* slate-100 for main text */
  --text-secondary: #9ca3af; /* slate-400 for secondary text */
  
  /* Vibrant Accents */
  --accent-primary: #60a5fa; /* blue-400 */
  --accent-secondary: #4ade80;/* green-400 for highlights */
  --danger-color: #f87171;   /* red-400 for danger actions */
  
  /* Dark-Theme Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.25), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 2rem;
  min-height: 100vh;
}

main > * + * {
  margin-top: 1.5rem;
}

.hidden {
  display: none !important;
}

/* 2. Header */
.app-header {
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.logo-icon {
  color: var(--accent-primary);
}

.app-title {
  font-size: 2.25rem;
  font-weight: 800;
  text-align: center;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

.text-accent {
  color: var(--accent-primary);
}

.app-version {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  letter-spacing: 0.025em;
}

/* 3. Card & General Containers */
.card {
  background-color: var(--bg-secondary);
  border-radius: 0.75rem;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

/* 4. Toolbar & Buttons */
.toolbar-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.toolbar-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.625rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  border: 1px solid transparent;
}
button:focus-visible, .button:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.btn-primary { 
  background-color: var(--accent-primary); 
  color: #030712; /* slate-950 for contrast */
  border-color: var(--accent-primary);
}
.btn-primary:hover { background-color: #93c5fd; /* blue-300 */ }

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

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

.btn-danger { 
  background-color: transparent;
  color: var(--danger-color);
  border-color: var(--danger-color);
}
.btn-danger:hover { background-color: var(--danger-color); color: white; }

.unsaved-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #fbbf24;
  background-color: rgba(251, 191, 36, 0.12);
  border: 1px solid rgba(251, 191, 36, 0.4);
  border-radius: 9999px;
  padding: 0.4rem 0.85rem;
  animation: pulse-warning 2.5s ease-in-out infinite;
}

@keyframes pulse-warning {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}


.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.form-checkbox {
  height: 1rem;
  width: 1rem;
  border-radius: 0.25rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  appearance: none;
  cursor: pointer;
  position: relative;
  transition: all .2s;
}
.form-checkbox:checked {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
}
.form-checkbox:checked::after {
  content: '✓';
  position: absolute;
  color: var(--bg-primary);
  font-size: 0.8rem;
  font-weight: bold;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* 5. Forms */
.form-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 1rem;
}
@media (min-width: 768px) {
  .form-grid { grid-template-columns: repeat(2, 1fr); }
  .form-grid .form-span-2 { grid-column: span 2 / span 2; }
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

input[type="text"], input[type="date"], textarea {
  width: 100%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 0.625rem 0.75rem;
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
input[type="text"]:focus, input[type="date"]:focus, textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.3);
}
textarea {
  resize: vertical;
}

/* 6. Setlists */
.setlists-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 1.5rem;
}
@media (min-width: 768px) { .setlists-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1280px) { .setlists-grid { grid-template-columns: repeat(4, 1fr); } }

.setlist-column {
  background-color: var(--bg-secondary);
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  overflow: hidden; /* To contain rounded corners */
}

.setlist-title {
  font-size: 1.125rem;
  font-weight: 600;
  padding: 1rem 1.25rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  background-color: var(--header-bg);
}

.droppable-list {
  padding: 0.75rem;
  flex-grow: 1;
  min-height: 12.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem; /* Increased gap for better separation */
}

/* 7. Song Cards */
.song-card {
  padding: 0.75rem;
  border-radius: 0.5rem;
  background-color: var(--surface-card); /* Lighter than list bg */
  cursor: pointer;
  border: 1px solid var(--border-color);
  position: relative;
  transition: all 0.2s ease-in-out;
  box-shadow: var(--shadow-sm);
}
.song-card:hover {
  border-color: var(--accent-primary);
  background-color: var(--surface-hover);
  box-shadow: var(--shadow-md); /* Enhance shadow on hover */
  transform: translateY(-2px); /* Add a lift effect */
}
.song-card.hidden { display: none; }
.song-card .drag-handle {
  display: flex;
  align-items: center;
  color: var(--text-secondary); /* Make handle visible by default */
  cursor: grab;
  transition: color 0.2s;
}
.song-card:hover .drag-handle {
  color: var(--accent-primary); /* Change color on hover to match border */
}
.drag-handle:active { cursor: grabbing; }

.card-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 0.75rem;
  overflow: hidden;
}

.song-info-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-grow: 1;
  overflow: hidden;
  min-width: 0;
}
.song-card .index {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  width: 1.75em; /* Align numbers */
  text-align: right;
}
.song-card .song-text {
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-grow: 1;
}
.song-card .song-text.highlighted {
  color: var(--accent-secondary);
  font-weight: 600;
}
.song-card .song-text.strikethrough {
  text-decoration: line-through;
  color: var(--text-secondary);
}
.song-card .song-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}
.song-card .song-key {
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--bg-secondary);
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
}
.archive-icon {
  color: var(--text-secondary);
  display: inline-flex;
}
.archive-icon svg { width: 1rem; height: 1rem; }

.song-card .notes {
  padding-left: 4.25rem; /* Align with song text */
  padding-top: 0.1rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.empty-set-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-secondary);
  text-align: center;
  padding: 1rem;
  border-radius: 0.5rem;
  border: 2px dashed var(--border-color);
  min-height: 100px;
}
.empty-set-placeholder svg {
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: 0.75rem;
  color: var(--border-color);
}
.empty-set-placeholder .placeholder-title {
  font-weight: 600;
  color: var(--text-primary);
}
.empty-set-placeholder .placeholder-text {
  font-size: 0.875rem;
}

/* 8. SortableJS & Dragging */
.sortable-ghost {
  opacity: 1;
  background-color: rgba(96, 165, 250, 0.15); /* Semi-transparent blue */
  border: 1px dashed var(--accent-primary);
  box-shadow: none;
}
.sortable-ghost * {
  opacity: 0.5;
}

/* 9. Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(3, 7, 18, 0.75); /* slate-950 with opacity */
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  opacity: 1;
  transition: opacity 0.3s ease;
}
.modal-backdrop.hidden {
  display: none;
  opacity: 0;
}
.modal-content {
  background-color: var(--bg-secondary);
  border-radius: 0.75rem;
  box-shadow: var(--shadow-md);
  width: 100%;
  max-width: 32rem;
  transform: scale(1);
  opacity: 1;
  transition: all 0.3s ease;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
}
.modal-backdrop.hidden .modal-content {
  transform: scale(0.95);
  opacity: 0;
}

.modal-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}
.modal-options {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.875rem;
}
.modal-buttons {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  justify-content: flex-end;
}
.modal-buttons .btn-grow {
  flex-grow: 1;
}
.modal-buttons .btn-delete {
  margin-left: auto;
  padding: 0.625rem;
  border-radius: 9999px;
  background-color: transparent;
  color: var(--danger-color);
  border: 1px solid var(--border-color);
  transition: background-color 0.2s, color 0.2s;
}
.modal-buttons .btn-delete:hover {
    background-color: var(--danger-color);
    border-color: var(--danger-color);
    color: white;
}

/* Swap cancel and save buttons visually */
.modal-buttons .btn-tertiary {
  order: 1;
}
.modal-buttons .btn-secondary {
  order: 2;
  /* Make Save the primary action in modal */
  background-color: var(--accent-primary);
  color: #030712;
  border-color: var(--accent-primary);
}
.modal-buttons .btn-secondary:hover {
  background-color: #93c5fd;
}