/* ==========================================================================
   Harmonix - Modern Glassmorphism Theme & Stylesheet
   ========================================================================== */

/* Variables */
:root {
  --bg-color: #08080f;
  --panel-bg: rgba(18, 18, 28, 0.65);
  --panel-border: rgba(255, 255, 255, 0.08);
  --panel-glow: rgba(0, 0, 0, 0.35);
  
  --text-primary: #f0f0f7;
  --text-secondary: #9aa0b9;
  --text-muted: #62677d;
  
  --primary-glow: rgba(0, 242, 254, 0.4);
  --secondary-glow: rgba(178, 94, 255, 0.4);
  
  --color-major: #00f2fe; /* Neon Cyan */
  --color-minor: #b25eff; /* Neon Purple */
  --color-active: #00e676; /* Neon Green */
  --color-danger: #ff1744; /* Neon Red */
  
  --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  line-height: 1.5;
}

/* Background Animated Ambient Glows */
.bg-glow {
  position: fixed;
  width: 50vw;
  height: 50vw;
  border-radius: 50%;
  pointer-events: none;
  z-index: -1;
  filter: blur(120px);
  opacity: 0.15;
  animation: float 20s infinite alternate ease-in-out;
}

.bg-glow-1 {
  background: radial-gradient(circle, var(--color-major) 0%, transparent 70%);
  top: -10%;
  left: -10%;
}

.bg-glow-2 {
  background: radial-gradient(circle, var(--color-minor) 0%, transparent 70%);
  bottom: -10%;
  right: -10%;
  animation-delay: -5s;
}

@keyframes float {
  0% {
    transform: translate(0, 0) scale(1);
  }
  100% {
    transform: translate(10%, 10%) scale(1.1);
  }
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.02);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
  border: 2px solid transparent;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Glassmorphism Styles */
.glass {
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--panel-border);
  box-shadow: 0 8px 32px 0 var(--panel-glow);
  border-radius: 16px;
}

/* Overlay & Startup UI */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 5, 10, 0.85);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.overlay-card {
  padding: 48px;
  text-align: center;
  max-width: 480px;
  width: 90%;
  transform: translateY(0);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.overlay-card .logo-icon {
  font-size: 4rem;
  color: var(--color-major);
  margin-bottom: 24px;
  text-shadow: 0 0 30px var(--primary-glow);
  animation: pulse-glow 2s infinite ease-in-out;
}

.overlay-card h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #ffffff 30%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.overlay-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 32px;
  line-height: 1.6;
}

/* Buttons */
.btn {
  font-family: var(--font-main);
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-major), var(--color-minor));
  color: #000;
  font-weight: 800;
  box-shadow: 0 4px 20px var(--primary-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px var(--primary-glow), 0 0 10px rgba(255, 255, 255, 0.3) inset;
}
.btn-primary:active {
  transform: translateY(1px);
}

.btn-large {
  padding: 16px 32px;
  font-size: 1.1rem;
  border-radius: 12px;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
  border-radius: 6px;
}

/* App Container Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 24px;
  max-width: 1600px;
  margin: 0 auto;
  gap: 24px;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
}

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

.header-logo h1 {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(135deg, #fff 40%, var(--color-major));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-icon-small {
  font-size: 1.4rem;
  color: var(--color-major);
  text-shadow: 0 0 10px var(--primary-glow);
}

/* Global Controls */
.global-controls {
  display: flex;
  align-items: center;
  gap: 24px;
}

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

.btn-control {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  font-size: 1.1rem;
}
.btn-control:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  transform: scale(1.05);
}
.btn-control:active {
  transform: scale(0.95);
}
#btn-play.playing {
  background: var(--color-active);
  color: #000;
  box-shadow: 0 0 15px rgba(0, 230, 118, 0.4);
}

.bpm-control label, .sound-control label, .volume-control label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  font-weight: 600;
}

.mono-font {
  font-family: var(--font-mono);
}

#display-bpm {
  font-size: 0.9rem;
  color: var(--color-major);
  min-width: 65px;
}

/* HTML Custom Range Sliders */
input[type="range"] {
  -webkit-appearance: none;
  width: 100px;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  outline: none;
  transition: background var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-primary);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

input[type="range"]:hover::-webkit-slider-thumb {
  transform: scale(1.2);
  background: var(--color-major);
}

.glass-select {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: 8px;
  font-family: var(--font-main);
  outline: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.glass-select:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}
.glass-select option {
  background: #12121c;
  color: var(--text-primary);
}

/* Layout Grid */
.app-main {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 24px;
  flex: 1;
}

/* Panels styling */
.panel {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.badge {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-major);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.1);
}

/* Panel specific configurations */
.panel-left {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.panel-right {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* SVG Circle of Fifths */
.circle-container {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100%;
  aspect-ratio: 1/1;
}

#svg-circle {
  width: 95%;
  height: 95%;
  max-width: 320px;
}

/* SVG Elements style (populated by JS) */
.circle-sector {
  cursor: pointer;
  stroke: rgba(15, 15, 25, 0.8);
  stroke-width: 2px;
  transition: all var(--transition-fast);
}

.sector-outer {
  fill: rgba(255, 255, 255, 0.03);
}

.sector-inner {
  fill: rgba(255, 255, 255, 0.015);
}

.circle-sector:hover {
  filter: brightness(1.3);
}

.circle-sector.active-major {
  fill: rgba(0, 242, 254, 0.25);
  stroke: var(--color-major);
  filter: drop-shadow(0 0 8px var(--primary-glow));
}

.circle-sector.active-minor {
  fill: rgba(178, 94, 255, 0.25);
  stroke: var(--color-minor);
  filter: drop-shadow(0 0 8px var(--secondary-glow));
}

.circle-text {
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 13px;
  fill: var(--text-secondary);
  pointer-events: none;
  user-select: none;
  transition: fill var(--transition-fast);
}

.circle-text.text-active {
  fill: #fff;
  font-weight: 800;
}

.circle-center-label {
  font-family: var(--font-main);
  font-weight: 800;
  font-size: 18px;
  fill: #fff;
  text-anchor: middle;
  dominant-baseline: middle;
  pointer-events: none;
}

/* Diatonic Chord Pads */
.chords-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  max-height: 240px;
  overflow-y: auto;
  padding-right: 4px;
}

.chord-pad {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.chord-pad::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--text-muted);
  opacity: 0.85;
  transition: all var(--transition-fast);
}

.chord-pad.tonic::before {
  background: var(--color-major);
}

.chord-pad.subdominant::before {
  background: var(--color-active);
}

.chord-pad.dominant::before {
  background: #ff4081; /* Pinkish red for tension */
}

.chord-pad:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

.chord-pad:hover::before {
  opacity: 1;
  width: 6px;
}

.chord-pad:active {
  transform: translateY(1px);
}

.chord-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chord-name {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
}

.chord-roman {
  font-size: 0.7rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.btn-add-chord {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.btn-add-chord:hover {
  background: var(--color-major);
  color: #000;
  border-color: var(--color-major);
  box-shadow: 0 0 10px var(--primary-glow);
  transform: scale(1.1);
}

/* Timeline Grid */
.timeline-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 8px;
  width: 100%;
}

.timeline-step {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  padding: 12px 6px;
  text-align: center;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  transition: all var(--transition-fast);
  user-select: none;
}

.timeline-step:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.12);
}

.timeline-step.active {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--color-major);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.15);
}

.timeline-step.playing-step {
  border-color: var(--color-active);
  background: rgba(0, 230, 118, 0.08);
  box-shadow: 0 0 12px rgba(0, 230, 118, 0.2);
}

.step-num {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 600;
}

.step-chord-name {
  font-size: 0.95rem;
  font-weight: 800;
  color: #fff;
  min-height: 24px;
}

.step-chord-roman {
  font-size: 0.65rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  min-height: 16px;
}

/* Sequencer Grid Outer Container */
.sequencer-outer {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 8px;
  align-items: stretch;
  width: 100%;
}

.sequencer-labels {
  display: grid;
  grid-template-rows: repeat(8, 36px);
  gap: 4px;
  align-items: center;
}

.note-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: right;
  padding-right: 8px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.note-label.active-note {
  color: var(--color-major);
  font-weight: 800;
}

.sequencer-scroll-container {
  overflow-x: auto;
  padding-bottom: 8px;
}

.sequencer-grid {
  display: grid;
  grid-template-rows: repeat(8, 36px);
  grid-template-columns: repeat(16, 1fr);
  gap: 4px;
  min-width: 480px; /* Ensures grid columns don't compress too much */
}

/* Sequencer Cell Buttons */
.seq-cell {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  cursor: pointer;
  height: 36px;
  transition: all var(--transition-fast);
  position: relative;
}

.seq-cell:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
}

.seq-cell.selected {
  background: linear-gradient(135deg, var(--color-major), var(--color-minor));
  border-color: var(--color-major);
  box-shadow: 0 0 10px var(--primary-glow);
}

/* Playing columns marker */
.seq-cell.playing-column {
  background: rgba(255, 255, 255, 0.06);
}
.seq-cell.selected.playing-column {
  background: linear-gradient(135deg, var(--color-active), var(--color-minor));
  box-shadow: 0 0 12px rgba(0, 230, 118, 0.4);
}

/* Visualizer & FX */
.visualizer-fx-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  align-items: center;
}

.visualizer-container {
  background: rgba(5, 5, 10, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  height: 120px;
  overflow: hidden;
  position: relative;
}

#canvas-visualizer {
  width: 100%;
  height: 100%;
  display: block;
}

.fx-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.fx-slider-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.fx-slider-group label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.fx-slider-group .range-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.fx-slider-group input[type="range"] {
  flex: 1;
}

.fx-slider-group span {
  font-size: 0.8rem;
  color: var(--color-minor);
  min-width: 40px;
  text-align: right;
}

/* Footer styles */
.app-footer {
  text-align: center;
  padding: 16px 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.03);
}

/* Keyframes */
@keyframes pulse-glow {
  0%, 100% {
    transform: scale(1);
    filter: drop-shadow(0 0 20px var(--primary-glow));
  }
  50% {
    transform: scale(1.05);
    filter: drop-shadow(0 0 35px var(--primary-glow));
  }
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .app-main {
    grid-template-columns: 1fr;
  }
  .panel-left {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 24px;
  }
  .chords-grid {
    max-height: none;
  }
  .circle-container {
    max-width: 320px;
    margin: 0 auto;
  }
}

@media (max-width: 767px) {
  .panel-left {
    grid-template-columns: 1fr;
  }
  .app-header {
    flex-direction: column;
    gap: 16px;
    align-items: stretch;
    text-align: center;
  }
  .header-logo {
    justify-content: center;
  }
  .global-controls {
    flex-wrap: wrap;
    justify-content: center;
  }
  .timeline-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .visualizer-fx-grid {
    grid-template-columns: 1fr;
  }
}

/* Beginner Helper Features */
.chord-legend {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  flex-wrap: wrap;
  gap: 8px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.legend-dot.tonic {
  background: var(--color-major);
  box-shadow: 0 0 6px var(--primary-glow);
}

.legend-dot.subdominant {
  background: var(--color-active);
  box-shadow: 0 0 6px rgba(0, 230, 118, 0.4);
}

.legend-dot.dominant {
  background: #ff4081;
  box-shadow: 0 0 6px rgba(255, 64, 129, 0.4);
}

/* Recommended Chord Highlighting */
.chord-pad.recommended {
  border-color: var(--color-active);
  box-shadow: 0 0 12px rgba(0, 230, 118, 0.2) inset, 0 0 8px rgba(0, 230, 118, 0.15);
  animation: pulse-border 2s infinite ease-in-out;
}

@keyframes pulse-border {
  0%, 100% {
    border-color: rgba(0, 230, 118, 0.5);
  }
  50% {
    border-color: var(--color-active);
  }
}

.recommend-badge {
  position: absolute;
  top: 3px;
  right: 6px;
  font-size: 0.55rem;
  color: var(--color-active);
  font-weight: 800;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 2px;
}

/* Help Modal Specifics */
.help-card {
  max-width: 550px;
  width: 92%;
  padding: 32px 36px;
  text-align: left;
  position: relative;
}

.help-card h2 {
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  font-size: 1.25rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.btn-close:hover {
  color: #fff;
}

.help-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 28px;
}

.help-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.02);
  padding: 14px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.help-step .step-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid var(--primary-glow);
  color: var(--color-major);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  flex-shrink: 0;
  box-shadow: 0 0 8px var(--primary-glow);
}

.help-step:nth-child(2) .step-icon {
  background: rgba(178, 94, 255, 0.1);
  border-color: var(--secondary-glow);
  color: var(--color-minor);
  box-shadow: 0 0 8px var(--secondary-glow);
}

.help-step:nth-child(3) .step-icon {
  background: rgba(0, 230, 118, 0.1);
  border-color: rgba(0, 230, 118, 0.3);
  color: var(--color-active);
  box-shadow: 0 0 8px rgba(0, 230, 118, 0.3);
}

.help-step h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 4px;
}

.help-step p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

#btn-close-guide {
  width: 100%;
}