/* CSS Variables for Modern DAW Theme (Chordpernicus: purple accent) */
:root {
  --bg-primary: #f4f5f7;
  --bg-secondary: #ffffff;
  --text-primary: #1a1d24;
  --text-secondary: #6b7280;
  --border-color: #dde1e6;
  --card-bg: #ffffff;
  --visualizer-bg: #ffffff;
  --visualizer-border: #d8c7fe;
  --accent-primary: #7c4dff;
  --accent-primary-rgb: 124, 77, 255;
  --accent-secondary: #5a6472;
  --accent-secondary-rgb: 90, 100, 114;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px 0 rgba(16, 24, 40, 0.05);
  --shadow-md: 0 4px 8px -2px rgba(16, 24, 40, 0.08);
  --shadow-lg: 0 12px 24px -6px rgba(16, 24, 40, 0.12);
  --shadow-focus: 0 0 0 3px rgba(124, 77, 255, 0.18);
  --grid-pattern: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' stroke='%237c4dff' stroke-width='1' opacity='0.06'%3E%3Cpath d='M0 20h40M20 0v40'/%3E%3C/g%3E%3C/svg%3E");
}

[data-theme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --border-color: #262c36;
  --card-bg: #12161d;
  --visualizer-bg: #0a0d12;
  --visualizer-border: #372a4a;
  --accent-primary: #a37bff;
  --accent-primary-rgb: 163, 123, 255;
  --accent-secondary: #9ca3af;
  --accent-secondary-rgb: 156, 163, 175;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 32px -8px rgba(0, 0, 0, 0.6);
  --shadow-focus: 0 0 0 3px rgba(163, 123, 255, 0.25);
  --grid-pattern: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' stroke='%23a37bff' stroke-width='1' opacity='0.05'%3E%3Cpath d='M0 20h40M20 0v40'/%3E%3C/g%3E%3C/svg%3E");
}

body {
  background-color: var(--bg-primary) !important;
  background-image: var(--grid-pattern);
  color: var(--text-primary) !important;
  transition: background-color 0.3s ease, color 0.3s ease;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  letter-spacing: -0.01em;
}

.container {
  max-width: 1200px;
}

.main-container {
  max-width: 1400px;
  padding-top: 2rem;
  padding-bottom: 3rem;
}

@media (min-width: 992px) {
  .sticky-sidebar {
    position: sticky;
    top: 2rem;
  }
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, #2a1e4a 0%, #17142f 100%);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
  margin-bottom: 3rem;
  position: relative;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--grid-pattern);
  opacity: 0.5;
  pointer-events: none;
}

[data-theme="dark"] .hero-section {
  background: linear-gradient(135deg, #231a3d 0%, #100d1f 100%);
  border-color: rgba(163, 123, 255, 0.25);
}

.hero-content {
  color: white !important;
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  color: white !important;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.hero-content p {
  color: rgba(255, 255, 255, 0.9) !important;
  line-height: 1.7;
}

/* Form Styles */
.form-title {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  color: var(--text-primary);
}

#reharmonizeForm {
  background-color: var(--bg-secondary) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

#reharmonizeForm .d-grid {
  gap: 0.5rem;
}

/* Card Styles */
.card {
  background-color: var(--card-bg) !important;
  border: 1px solid var(--border-color) !important;
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-lg);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  overflow: hidden;
}

.card.original-card {
  border-color: var(--accent-primary) !important;
}

.bg-light {
  background-color: var(--bg-secondary) !important;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.border {
  border-color: var(--border-color) !important;
}

.text-muted {
  color: var(--text-secondary) !important;
}

.chords-text {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
  padding: 0.75rem 1rem;
  line-height: 1.8;
  font-size: 0.95rem;
}

.warning-text {
  color: #b98900;
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

[data-theme="dark"] .warning-text {
  color: #e5c158;
}

/* Buttons */
.btn {
  border-radius: var(--radius-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  font-size: 0.85rem;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid transparent;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
  font-weight: 700;
}

.btn-primary:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-focus);
  color: #ffffff;
  opacity: 0.92;
}

.btn-lg {
  font-size: 1.05rem !important;
  padding: 1rem 1.75rem !important;
  font-weight: 700 !important;
  letter-spacing: 0.02em !important;
}

.btn-outline-secondary {
  border-color: var(--border-color);
  color: var(--text-primary);
}

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

/* MIDI Player */
midi-player {
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: 0.5rem;
}

/* MIDI Visualizer (Piano Roll only) */
midi-visualizer {
  height: 200px !important;
  max-height: 200px !important;
  min-height: 150px;
  display: block;
  overflow-y: auto;
  background-color: var(--visualizer-bg);
  border: 1px solid var(--visualizer-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

html {
  scroll-behavior: smooth;
}

[data-theme="dark"] midi-player {
  filter: invert(0.9) hue-rotate(180deg);
}

[data-theme="dark"] midi-visualizer[type="piano-roll"] {
  filter: invert(0.95);
  box-shadow: var(--shadow-sm);
}

midi-visualizer[type="piano-roll"] {
  background-color: #ffffff !important;
}

/* Dark Mode Toggle Button */
#theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1050;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s ease;
}

#theme-toggle:hover {
  transform: scale(1.1);
}

[data-theme="dark"] #theme-toggle {
  background-color: var(--bg-secondary);
  border-color: var(--border-color);
  color: var(--text-primary);
}

/* Form Control Styling */
.form-control {
  font-size: 1.05rem !important;
  padding: 0.875rem 1rem !important;
  font-weight: 500;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary) !important;
  color: var(--text-primary) !important;
  border-radius: var(--radius-sm);
}

.form-control:focus {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-focus);
  background-color: var(--bg-secondary) !important;
}

.form-floating > .form-control {
  padding-top: 1.75rem !important;
  padding-bottom: 0.75rem !important;
}

.form-floating > label {
  padding: 1rem 1rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label {
  opacity: 0.65;
  transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
}

/* Style Chips */
.style-chip-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.style-chip-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn-outline-style {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: rgba(var(--accent-primary-rgb), 0.06);
  font-size: 0.8rem;
  padding: 0.375rem 0.75rem;
  font-weight: 600;
}

.btn-outline-style:hover {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #fff;
}

.btn-outline-style.active {
  background-color: var(--accent-primary) !important;
  border-color: var(--accent-primary) !important;
  color: #fff !important;
}

/* Card Header */
.card-header {
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--border-color);
  padding: 0.875rem 1.25rem;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

/* Small Mobile (<576px) */
@media (max-width: 576px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hero-section .row {
    padding: 2rem 1rem !important;
  }

  form {
    padding: 1.5rem !important;
  }
}