:root {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --card-border: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --accent-color: #10b981;
  --accent-hover: #059669;
  --danger-color: #ef4444;
  --danger-hover: #dc2626;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  padding: 2rem 1rem;
}

.app-container {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-area .icon {
  font-size: 2.5rem;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  padding: 0.5rem;
  border-radius: var(--radius-md);
}

.logo-area h1 {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-area p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.2rem;
}

/* Card Styling */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
}

/* Configuration Card */
.config-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.tooltip {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.input-group {
  display: flex;
  gap: 0.75rem;
}

.input-group input[type="text"] {
  flex: 1;
  background-color: #0f172a;
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
}

.input-group input[type="text"]:focus {
  outline: 2px solid var(--primary-color);
  border-color: transparent;
}

/* Buttons */
.btn {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

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

.btn-secondary {
  background-color: #334155;
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: #475569;
}

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

.btn-accent:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-danger {
  background-color: transparent;
  color: #f87171;
  border: 1px solid #7f1d1d;
  padding: 0.5rem 0.75rem;
}

.btn-danger:hover {
  background-color: var(--danger-color);
  color: white;
}

.btn-icon {
  background-color: #334155;
  color: white;
  padding: 0.5rem 0.85rem;
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed #475569;
  border-radius: var(--radius-md);
  padding: 2.5rem 1.5rem;
  text-align: center;
  transition: all 0.2s ease;
  background-color: rgba(15, 23, 42, 0.4);
  cursor: pointer;
}

.drop-zone.dragover {
  border-color: var(--primary-color);
  background-color: rgba(99, 102, 241, 0.1);
  transform: scale(1.01);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.upload-icon {
  font-size: 3rem;
}

.drop-zone h3 {
  font-size: 1.2rem;
  font-weight: 600;
}

.drop-zone p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

/* Music List Section */
.list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.list-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

.list-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.search-input {
  background-color: #0f172a;
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.music-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Music Card Item */
.music-item {
  background-color: #0f172a;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color 0.2s ease;
}

.music-item:hover {
  border-color: #475569;
}

.music-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.music-meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  overflow: hidden;
}

.music-badge {
  font-size: 1.5rem;
  background-color: rgba(99, 102, 241, 0.15);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
}

.music-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.song-title {
  font-weight: 600;
  font-size: 1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.1rem;
}

/* Audio Player */
audio {
  width: 100%;
  height: 40px;
  border-radius: var(--radius-sm);
  outline: none;
}

/* URL Copy Box */
.url-box-container {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.url-input {
  flex: 1;
  background-color: #1e293b;
  border: 1px solid #475569;
  color: #38bdf8;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  font-family: monospace;
  font-size: 0.88rem;
}

.url-input:focus {
  outline: 1px solid #38bdf8;
}

/* States & Spinners */
.loading-state, .empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 0.5rem;
}

.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 0.75rem auto;
}

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

.hidden {
  display: none !important;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: #10b981;
  color: white;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 20px rgba(0,0,0,0.3);
  font-weight: 600;
  font-size: 0.95rem;
  z-index: 1000;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}