.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0 var(--space-5);
  height: 48px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--duration-fast) var(--ease-standard),
              background var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-fast) var(--ease-standard);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--color-accent-gradient);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  filter: brightness(1.08);
}

.btn-ghost {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  backdrop-filter: blur(12px);
}

.btn-ghost:hover {
  background: var(--color-surface-hover);
}

.btn-lg {
  height: 56px;
  font-size: 1rem;
}

.btn-block {
  width: 100%;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: background var(--duration-fast) var(--ease-standard), color var(--duration-fast) var(--ease-standard);
}

.icon-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

/* Champs de formulaire */
.home-form label,
label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  margin-top: var(--space-4);
}

input[type="text"],
input[type="search"] {
  width: 100%;
  height: 48px;
  padding: 0 var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
}

input[type="text"]::placeholder,
input[type="search"]::placeholder {
  color: var(--color-text-dim);
}

input[type="text"]:focus,
input[type="search"]:focus {
  border-color: var(--color-accent-2);
}

/* Cartes glassmorphism */
.card, .modal-content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
}

/* Liste de morceaux */
.track-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4) var(--space-7);
}

.track-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease-standard);
}

.track-item:hover {
  background: var(--color-surface-hover);
}

.track-cover {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  background: var(--color-bg-elevated);
  flex-shrink: 0;
}

.track-meta {
  min-width: 0;
  flex: 1;
}

.track-title {
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-artist {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-added-by {
  font-size: 0.75rem;
  color: var(--color-text-dim);
}

.track-duration {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  flex-shrink: 0;
}

.track-preview-btn.playing {
  color: var(--color-accent-2);
}

.track-action-btn {
  background: var(--color-accent-gradient);
  color: white;
}

.track-action-btn.added {
  background: var(--color-success);
  color: #04281c;
}

/* Skeleton loaders */
.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
}

.skeleton::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
  animation: shimmer 1.4s infinite;
}

.empty-state {
  text-align: center;
  color: var(--color-text-dim);
  padding: var(--space-6) var(--space-4);
  font-size: 0.9rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: var(--radius-full);
  background: var(--color-accent-2);
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
}

/* Modal de partage */
.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4, 8, 20, 0.7);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 340px;
  padding: var(--space-6);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.modal-close {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
}

.share-qr {
  border-radius: var(--radius-md);
  background: white;
  padding: var(--space-2);
}

.share-code {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--color-accent-2);
}