/* ==========================================================================
   ChordVerse Modern Dark Theme (Obsidian & Cyan Accent)
   ========================================================================== */

:root {
  --bg-base: #0a0c10;
  --bg-surface: #12161f;
  --bg-card: rgba(22, 28, 40, 0.75);
  --bg-card-hover: rgba(30, 38, 54, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: #00d2ff;
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --primary-accent: #00d2ff;
  --primary-glow: rgba(0, 210, 255, 0.25);
  --secondary-accent: #3a7bd5;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --tag-zh-bg: rgba(239, 68, 68, 0.15);
  --tag-zh-text: #f87171;
  --tag-en-bg: rgba(59, 130, 246, 0.15);
  --tag-en-text: #60a5fa;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.4);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(0, 210, 255, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(58, 123, 213, 0.06) 0%, transparent 40%);
  background-attachment: fixed;
}

code, pre {
  font-family: 'JetBrains Mono', monospace;
}

.app-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 24px 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, #00d2ff, #3a7bd5);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.brand-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-badge {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  background: rgba(0, 210, 255, 0.15);
  color: var(--primary-accent);
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid rgba(0, 210, 255, 0.3);
}

.brand-sub {
  font-size: 13px;
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #00d2ff, #3a7bd5);
  color: #fff;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-play {
  padding: 6px 14px;
  font-size: 13px;
}

.btn-playing {
  background: linear-gradient(135deg, #ef4444, #dc2626) !important;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.3) !important;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Main Grid Layout */
.main-grid {
  display: grid;
  grid-template-columns: 480px 1fr;
  gap: 24px;
}

@media (max-width: 1024px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

/* Cards */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
}

.card-header h2 {
  font-size: 17px;
  font-weight: 700;
}

.card-tag {
  font-size: 12px;
  color: var(--text-muted);
}

/* Section Labels & Titles */
.section-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 8px;
}

.section-title {
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  margin-bottom: 12px;
}

/* Preset Chips */
.preset-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.chip:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.chip.active {
  background: rgba(0, 210, 255, 0.15);
  border-color: var(--primary-accent);
  color: var(--primary-accent);
  font-weight: 600;
}

/* Progression Step Builder */
.builder-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.builder-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.transposition-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.transposition-control label {
  font-size: 12px;
  color: var(--text-secondary);
}

.transposition-control select {
  background: var(--bg-base);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--primary-accent);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 8px;
  outline: none;
}

.prog-display {
  min-height: 52px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px dashed rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.prog-empty-hint {
  font-size: 13px;
  color: var(--text-muted);
}

.active-deg-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: linear-gradient(135deg, rgba(0, 210, 255, 0.2), rgba(58, 123, 213, 0.2));
  border: 1px solid var(--primary-accent);
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  cursor: pointer;
}

.active-deg-chip:hover {
  transform: scale(1.05);
}

.active-deg-chip.playing-highlight {
  background: linear-gradient(135deg, #00d2ff, #3a7bd5) !important;
  color: #000 !important;
  box-shadow: 0 0 16px var(--primary-accent);
  transform: scale(1.1);
}

.active-deg-chip small {
  font-size: 11px;
  color: var(--primary-accent);
}

.active-deg-chip.playing-highlight small {
  color: #000 !important;
  font-weight: 800;
}

.builder-buttons {
  display: grid;
  grid-template-columns: repeat(7, 1fr) 40px 40px;
  gap: 6px;
}

.chord-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 10px 4px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
}

.chord-btn:hover {
  background: rgba(0, 210, 255, 0.15);
  border-color: var(--primary-accent);
  transform: translateY(-2px);
}

.chord-btn strong {
  font-size: 15px;
}

.chord-btn span {
  font-size: 10px;
  color: var(--text-muted);
}

.chord-btn-action {
  background: rgba(255, 255, 255, 0.03);
}

.chord-btn-action:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
  color: #ef4444;
}

/* Search Form */
.search-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.input-group {
  display: flex;
  position: relative;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
}

.input-group input {
  flex: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  padding: 12px 14px 12px 42px;
  font-size: 14px;
  color: var(--text-primary);
  outline: none;
  transition: var(--transition);
}

.input-group input:focus {
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.input-group .btn {
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 0 20px;
}

.filter-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.filter-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.filter-item label {
  font-size: 12px;
  color: var(--text-secondary);
}

.filter-item select, .filter-item input {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 13px;
  color: var(--text-primary);
  outline: none;
}

.filter-item select:focus, .filter-item input:focus {
  border-color: var(--primary-accent);
}

/* Probability Section */
.probability-section {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
}

.prob-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.prob-row {
  display: grid;
  grid-template-columns: 48px 1fr 44px;
  align-items: center;
  gap: 12px;
}

.prob-roman {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-accent);
}

.prob-bar-container {
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
}

.prob-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #00d2ff, #3a7bd5);
  border-radius: 4px;
  transition: width 0.4s ease;
}

.prob-pct {
  font-size: 12px;
  font-weight: 600;
  text-align: right;
  color: var(--text-primary);
}

.prob-desc {
  grid-column: 1 / -1;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: -4px;
  margin-bottom: 4px;
}

/* Analyzer Tool Box */
.analyzer-tool-box {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
}

.tool-desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.analyze-input-row {
  display: grid;
  grid-template-columns: 1fr 90px 90px;
  gap: 8px;
}

.analyze-input-row input, .analyze-input-row select {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 13px;
  color: var(--text-primary);
  outline: none;
}

.custom-result-box {
  margin-top: 12px;
  padding: 12px;
  background: rgba(0, 210, 255, 0.05);
  border: 1px solid rgba(0, 210, 255, 0.2);
  border-radius: var(--radius-sm);
  font-size: 13px;
}

/* Right Panel: Results Header */
.results-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
}

.progression-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px;
  font-weight: 800;
  color: var(--primary-accent);
}

.deg-tag {
  font-size: 12px;
  font-weight: 600;
  background: rgba(0, 210, 255, 0.15);
  padding: 2px 8px;
  border-radius: 12px;
}

.prog-title {
  font-size: 18px;
  font-weight: 700;
  margin-top: 4px;
}

.reference-keys {
  display: flex;
  gap: 16px;
  margin-top: 6px;
  font-size: 12px;
  color: var(--text-secondary);
}

.reference-keys strong {
  color: var(--text-primary);
}

.results-stat-box {
  text-align: right;
}

.stat-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary-accent);
  line-height: 1;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Songs Table */
.songs-table-wrapper {
  overflow-x: auto;
  max-height: 720px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
}

.songs-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
}

.songs-table th {
  background: rgba(0, 0, 0, 0.4);
  padding: 12px 14px;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  z-index: 1;
}

.songs-table td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
}

.songs-table tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

.song-title-cell {
  font-weight: 600;
}

.section-badge {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  font-size: 11px;
  color: var(--text-secondary);
}

.key-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-secondary);
}

.lang-badge {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.lang-badge.zh {
  background: var(--tag-zh-bg);
  color: var(--tag-zh-text);
}

.lang-badge.en {
  background: var(--tag-en-bg);
  color: var(--tag-en-text);
}

.song-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--primary-accent);
  text-decoration: none;
  font-weight: 500;
}

.song-link:hover {
  text-decoration: underline;
}

/* Loading & Empty States */
.loading-state, .empty-state {
  text-align: center;
  padding: 48px !important;
  color: var(--text-muted);
}

.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid rgba(0, 210, 255, 0.2);
  border-top-color: var(--primary-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 12px;
}

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

/* Footer */
.app-footer {
  text-align: center;
  padding: 16px;
  font-size: 12px;
  color: var(--text-muted);
}