/* ═══════════════════════════════════════════
   BOTONERA — Design System
   Dark musical interface inspired by hardware
   ═══════════════════════════════════════════ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ── CSS Variables / Design Tokens ── */
:root {
  /* Colors — Dark Musical Palette */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a2e;
  --bg-surface: #16213e;
  --bg-elevated: #1e2a4a;

  --text-primary: #e8e8f0;
  --text-secondary: #8888a8;
  --text-muted: #555577;
  --text-accent: #64ffda;

  --accent-primary: #64ffda;
  --accent-secondary: #7c4dff;
  --accent-tertiary: #ff6b9d;
  --accent-warning: #ffab40;
  --accent-danger: #ff5252;
  --accent-success: #69f0ae;

  /* Source colors — assigned dynamically */
  --source-1: #ff6b35;
  --source-2: #4ecdc4;
  --source-3: #c7f464;
  --source-4: #7c4dff;
  --source-5: #ff6b9d;
  --source-6: #ffd93d;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Typography */
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Transitions */
  --transition-fast: 80ms ease-out;
  --transition-normal: 200ms ease-out;
  --transition-slow: 400ms ease-out;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 20px rgba(100, 255, 218, 0.15);
  --shadow-inset: inset 0 2px 6px rgba(0,0,0,0.5);

  /* Z-index layers */
  --z-base: 0;
  --z-pads: 10;
  --z-fx: 20;
  --z-looper: 30;
  --z-modal: 100;
  --z-toast: 200;
}

/* ── Reset & Base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ── App Layout ── */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

/* ── Header / Toolbar ── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: var(--z-modal);
}

.app-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.app-logo h1 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-logo .version {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* ── Icon Buttons ── */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 1.1rem;
}

.icon-btn:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.icon-btn:active {
  transform: translateY(0) scale(0.95);
}

.icon-btn.active {
  background: var(--accent-primary);
  color: var(--bg-primary);
}

.icon-btn.danger {
  color: var(--accent-danger);
}

.icon-btn.danger:hover {
  background: rgba(255, 82, 82, 0.15);
}

/* ── Pack Selector ── */
.pack-selector {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.pack-selector select {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  padding-right: var(--space-xl);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238888a8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: all var(--transition-fast);
}

.pack-selector select:hover {
  border-color: rgba(255,255,255,0.15);
}

.pack-selector select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.1);
}

/* ── Main Content ── */
.main-content {
  flex: 1;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ── Section Headers ── */
.section-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.section-header h2 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.section-header .badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-elevated);
  color: var(--text-muted);
}

/* ── Sources Container ── */
.sources-container {
  display: grid;
  gap: var(--space-lg);
  /* Columns set dynamically via JS */
}

/* ── Source Group ── */
.source-group {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.04);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.source-group:hover {
  border-color: rgba(255,255,255,0.08);
}

.source-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-md);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.source-group-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.source-color-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.source-group-title span {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.source-type-badge {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.05);
  color: var(--text-muted);
  text-transform: uppercase;
}

.source-pads {
  padding: var(--space-md);
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-elevated);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ── Loading State ── */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  z-index: 9999;
  transition: opacity var(--transition-slow);
}

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

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--bg-tertiary);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

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

/* ── Toast Notifications ── */
.toast-container {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  display: flex;
  flex-direction: column-reverse;
  gap: var(--space-sm);
  z-index: var(--z-toast);
  pointer-events: none;
}

.toast {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-elevated);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: toast-in 0.3s ease-out;
  max-width: 320px;
}

.toast.success { border-left: 3px solid var(--accent-success); }
.toast.error { border-left: 3px solid var(--accent-danger); }
.toast.info { border-left: 3px solid var(--accent-primary); }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(10px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .main-content {
    padding: var(--space-md);
  }

  .sources-container {
    grid-template-columns: 1fr !important;
  }

  .app-header {
    padding: var(--space-sm) var(--space-md);
  }

  .app-logo h1 {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: var(--space-sm);
  }
}