/**
 * styles.css - Modern, Beautiful Luxury Theme for Circle Modulation Studio
 */

:root {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-surface: #1e293b;
  --bg-surface-elevated: #283548;
  --border-subtle: #334155;
  --border-focus: #6366f1;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-indigo: #6366f1;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --glow-indigo: rgba(99, 102, 241, 0.35);
  --glow-cyan: rgba(6, 182, 212, 0.3);
  --paper-bg: #ffffff;
  --paper-text: #0f172a;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Global */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.06) 0%, transparent 40%);
}

/* Header & Navigation Bar */
.app-header {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-indigo), var(--accent-cyan));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 4px 14px var(--glow-indigo);
}

.brand-title {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: #ffffff;
}

.brand-subtitle {
  font-size: 11px;
  color: var(--accent-cyan);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Control Hub & Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
}

.view-toggle {
  display: flex;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 3px;
}

.btn-toggle {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 6px 14px;
  font-size: 12.5px;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-toggle.active {
  background: var(--accent-indigo);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--glow-indigo);
}

/* Main Container Layout */
.app-main {
  flex: 1;
  padding: 24px;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

/* Metronome & Play-Along Bar */
.transport-bar {
  background: rgba(15, 23, 42, 0.94);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 14px 24px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  position: sticky;
  top: 65px;
  z-index: 95;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

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

.btn-play {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent-indigo), #4f46e5);
  border: none;
  color: #ffffff;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 16px var(--glow-indigo);
  transition: var(--transition-smooth);
}

.btn-play:hover {
  transform: scale(1.05);
}

.btn-play.playing {
  background: linear-gradient(135deg, var(--accent-rose), #e11d48);
  box-shadow: 0 4px 16px rgba(244, 63, 94, 0.4);
}

.tempo-control {
  display: flex;
  align-items: center;
  gap: 12px;
}

.tempo-display {
  display: flex;
  flex-direction: column;
}

.bpm-number {
  font-size: 24px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: #ffffff;
  line-height: 1;
}

.bpm-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.tempo-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 140px;
  height: 6px;
  border-radius: 3px;
  background: var(--border-subtle);
  outline: none;
}

.tempo-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  box-shadow: 0 0 10px var(--glow-cyan);
}

.btn-stepper {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: bold;
}

.btn-tap {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
}

/* Beat Indicator Dots */
.beat-dots {
  display: flex;
  align-items: center;
  gap: 8px;
}

.beat-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  transition: all 0.08s ease;
}

.beat-dot.active {
  background: var(--accent-indigo);
  border-color: #ffffff;
  box-shadow: 0 0 12px var(--accent-indigo);
  transform: scale(1.25);
}

.beat-dot.downbeat.active {
  background: var(--accent-emerald);
  box-shadow: 0 0 14px var(--accent-emerald);
}

/* Transport Toggles */
.transport-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.toggle-group {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--text-secondary);
}

.custom-switch {
  position: relative;
  display: inline-block;
  width: 38px;
  height: 22px;
}

.custom-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider-switch {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: var(--border-subtle);
  transition: .3s;
  border-radius: 34px;
}

.slider-switch:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
}

input:checked + .slider-switch {
  background-color: var(--accent-indigo);
}

input:checked + .slider-switch:before {
  transform: translateX(16px);
}

/* Split Two-Column View: Circle + Focused Score */
.split-view {
  display: grid;
  grid-template-columns: 480px 1fr;
  gap: 28px;
  align-items: start;
}

/* Left Column: Interactive Circle Box */
.circle-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  position: relative;
}

.circle-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.card-heading {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.badge {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--accent-cyan);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.circle-container {
  width: 100%;
  max-width: 440px;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* SVG Circle Elements Styling */
.circle-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.circle-track {
  fill: none;
  stroke: rgba(255, 255, 255, 0.05);
  stroke-width: 2.5;
}

.circle-inner-track {
  fill: none;
  stroke: rgba(99, 102, 241, 0.08);
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
}

.modulation-arc {
  fill: none;
  stroke: url(#arc-gradient);
  stroke-width: 4.5;
  stroke-linecap: round;
  filter: drop-shadow(0 0 6px var(--accent-indigo));
  transition: all 0.4s ease;
}

.hub-circle {
  fill: url(#center-bg);
  stroke: var(--border-subtle);
  stroke-width: 2;
}

.hub-inner-ring {
  fill: none;
  stroke: rgba(99, 102, 241, 0.2);
  stroke-width: 1.5;
}

.hub-label {
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 2px;
  fill: var(--text-muted);
  text-anchor: middle;
}

.hub-transition {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
  fill: #ffffff;
  text-anchor: middle;
}

.hub-keysig {
  font-size: 11px;
  font-weight: 600;
  fill: var(--accent-cyan);
  text-anchor: middle;
}

.hub-pedal {
  font-size: 11px;
  font-weight: 700;
  fill: var(--accent-amber);
  text-anchor: middle;
}

.key-node {
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.key-node:hover {
  transform: scale(1.15) !important;
}

.node-bg {
  fill: var(--bg-surface);
  transition: fill 0.2s ease;
}

.node-border {
  fill: none;
  stroke: var(--border-subtle);
  stroke-width: 1.5;
  transition: stroke 0.2s ease;
}

.node-name {
  font-size: 14px;
  font-weight: 800;
  fill: #ffffff;
  text-anchor: middle;
}

.node-sig {
  font-size: 10px;
  font-weight: 700;
  fill: var(--text-muted);
  text-anchor: middle;
}

.key-node.active .node-bg {
  fill: var(--accent-indigo);
}

.key-node.active .node-border {
  stroke: #ffffff;
  stroke-width: 2.5;
}

.key-node.active .node-name {
  fill: #ffffff;
}

/* Quick Navigation Arrows */
.circle-nav-controls {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.btn-nav {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-smooth);
}

.btn-nav:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--accent-indigo);
}

/* Right Column: Focused Notation & Voice Leading */
.focused-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.notation-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 16px;
}

.notation-title-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.notation-title {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.4px;
  color: #ffffff;
}

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

/* Paper Container for ABC Notation Rendering */
.paper-wrapper {
  background: var(--paper-bg);
  color: var(--paper-text);
  border-radius: var(--radius-md);
  padding: 24px;
  overflow-x: auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  display: flex;
  justify-content: center;
}

.focused-paper,
.focused-paper svg,
.card-notation,
.card-notation svg {
  color: var(--paper-text);
}

/* Voice Leading Analysis Grid */
.voice-blueprint-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.blueprint-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.voice-rows {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 8px 16px;
  font-size: 13px;
}

.voice-label {
  font-weight: 700;
  color: var(--accent-cyan);
}

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

/* 12-Key Scrolling View */
.grid-view-container {
  width: 100%;
  transition: all 0.25s ease;
}

.grid-view-container.layout-stream {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  max-width: 860px;
  margin: 0 auto;
}

.grid-view-container.layout-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 24px;
  max-width: 1400px;
  margin: 0 auto;
}

.grid-view-container.layout-stream .score-card {
  width: 100%;
}

.score-card {
  background: var(--paper-bg);
  color: var(--paper-text);
  border-radius: var(--radius-md);
  padding: 18px 24px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 2px solid transparent;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-margin-top: 180px;
  scroll-margin-bottom: 60px;
}

/* REAL-TIME ACTIVE CHORD HIGHLIGHTING */
text.active-chord-text,
text.active-chord-text tspan {
  fill: #4f46e5 !important;
  font-weight: 900 !important;
  filter: drop-shadow(0 0 5px rgba(79, 70, 229, 0.8));
  transition: fill 0.1s ease;
}

g.active-chord-note {
  color: #4f46e5 !important;
}

g.active-chord-note path,
g.active-chord-note ellipse,
g.active-chord-note circle {
  fill: #4f46e5 !important;
  stroke: #4f46e5 !important;
  filter: drop-shadow(0 0 4px rgba(79, 70, 229, 0.75));
  transition: fill 0.1s ease, stroke 0.1s ease;
}

/* INACTIVE MODULATIONS: Elegant, unobtrusive light gray */
.score-card.inactive {
  opacity: 0.32;
  filter: grayscale(100%);
  background: #f1f5f9;
}

.score-card.inactive:hover {
  opacity: 0.7;
  filter: grayscale(40%);
  transform: translateY(-2px);
}

/* ACTIVE MODULATION: Bold, vibrant, illuminated */
.score-card.active {
  opacity: 1.0;
  filter: none;
  background: #ffffff;
  border-color: var(--accent-indigo);
  box-shadow: 0 10px 30px -4px var(--glow-indigo);
  transform: translateY(-4px) scale(1.015);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 8px;
}

.card-num {
  font-size: 12px;
  font-weight: 800;
  color: var(--accent-indigo);
}

.card-title {
  font-size: 14px;
  font-weight: 700;
  color: #0f172a;
}

.card-keysig {
  font-size: 11px;
  background: #f1f5f9;
  color: #475569;
}

.score-card.active .card-keysig {
  background: #e0e7ff;
  color: #4338ca;
}

/* Keyboard Shortcut Hint Bar */
.footer-shortcuts {
  margin-top: 32px;
  padding: 16px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: center;
  gap: 24px;
}

.kbd {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 11px;
}

/* Responsive */
@media (max-width: 1024px) {
  .split-view {
    grid-template-columns: 1fr;
  }
  .circle-card {
    max-width: 500px;
    margin: 0 auto;
  }
}