/* ========================================
   Open Music - Components
   UI 组件样式
   ======================================== */

/* ========================================
   按钮组件
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  line-height: 1.5;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  user-select: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* 按钮变体 */
.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.25);
  border: none;
  font-weight: var(--font-semibold);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.35), var(--shadow-glow);
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  font-weight: var(--font-medium);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-glass-hover);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: none;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-glass);
  color: var(--text-primary);
}

/* 按钮尺寸 */
.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--text-lg);
}

/* 图标按钮 - 现代化设计 */
.btn-icon {
  width: 3.5rem;
  height: 3.5rem;
  padding: 0;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: all var(--transition-normal);
}

.btn-icon:hover:not(:disabled) {
  background: var(--bg-glass-hover);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 16px rgba(102, 126, 234, 0.2);
  transform: translateY(-2px) scale(1.05);
}

.btn-icon:active:not(:disabled) {
  transform: translateY(0) scale(0.98);
}

.btn-icon-sm {
  width: 2.8rem;
  height: 2.8rem;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-icon-sm:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px) scale(1.08);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

.btn-icon-lg {
  width: 4.5rem;
  height: 4.5rem;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.15) 0%, rgba(118, 75, 162, 0.15) 100%);
  backdrop-filter: blur(12px);
  border: 2px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.btn-icon-lg:hover:not(:disabled) {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.25) 0%, rgba(118, 75, 162, 0.25) 100%);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px) scale(1.06);
  box-shadow: 0 8px 30px rgba(102, 126, 234, 0.3), var(--shadow-glow);
}

/* 主播放按钮 - 与其他按钮风格一致 */
#playBtn {
  width: 3.2rem;
  height: 3.2rem;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#playBtn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px) scale(1.08);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

#playBtn:active:not(:disabled) {
  transform: translateY(0) scale(1.04);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

#playBtn .icon-lg {
  font-size: 1.5rem;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.1));
}

/* ========================================
   输入框组件
   ======================================== */

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.input-label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
}

.input {
  width: 100%;
  padding: var(--spacing-md);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--text-primary);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.input::placeholder {
  color: var(--text-muted);
}

.input:focus {
  border-color: var(--color-primary);
  background: var(--bg-glass-hover);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* 搜索框 */
.search-box {
  position: relative;
  width: 100%;
}

.search-input {
  padding-left: 3rem;
}

.search-icon {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

/* ========================================
   卡片组件
   ======================================== */

.card {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.card-glass {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-header {
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.card-body {
  color: var(--text-secondary);
}

/* ========================================
   歌曲项组件
   ======================================== */

.song-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.song-item:hover {
  background: var(--bg-glass);
}

.song-item.active {
  background: var(--bg-glass-hover);
  border-left: 3px solid var(--color-primary);
}

.song-cover {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  object-fit: cover;
  background: var(--bg-tertiary);
  flex-shrink: 0;
}

.song-info {
  flex: 1;
  min-width: 0;
}

.song-title {
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.song-artist {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.song-duration {
  font-size: var(--text-sm);
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ========================================
   标签组件
   ======================================== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  color: var(--text-secondary);
}

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

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

/* ========================================
   加载动画
   ======================================== */

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--bg-tertiary);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-lg {
  width: 48px;
  height: 48px;
  border-width: 4px;
}

/* 骨架屏加载 */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-tertiary) 0%,
    var(--bg-hover) 50%,
    var(--bg-tertiary) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ========================================
   模态框
   ======================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  padding: var(--spacing-lg);
  animation: fadeIn var(--transition-normal);
}

.modal {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
  animation: modalSlideIn var(--transition-normal);
}

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

.modal-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  max-height: calc(90vh - 140px);
}

.modal-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

/* 歌单选择列表 */
.playlist-select-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.playlist-select-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.playlist-select-item:hover {
  background: var(--bg-glass-hover);
  border-color: var(--color-primary);
  transform: translateX(4px);
}

.playlist-select-item-info {
  flex: 1;
}

.playlist-select-item-name {
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.playlist-select-item-count {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.playlist-select-item-icon {
  font-size: 1.5rem;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.playlist-select-item:hover .playlist-select-item-icon {
  opacity: 1;
}

/* ========================================
   下拉菜单
   ======================================== */

.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--spacing-xs));
  right: 0;
  min-width: 200px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm);
  z-index: var(--z-dropdown);
  animation: fadeIn var(--transition-fast);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--bg-glass);
  color: var(--text-primary);
}

.dropdown-divider {
  height: 1px;
  background: var(--border-color);
  margin: var(--spacing-sm) 0;
}

/* ========================================
   通知/提示
   ======================================== */

.toast {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  min-width: 300px;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-tooltip);
  animation: fadeIn var(--transition-normal);
}

.toast-success {
  border-left: 4px solid #48bb78;
}

.toast-error {
  border-left: 4px solid #f56565;
}

.toast-info {
  border-left: 4px solid var(--color-primary);
}

/* ========================================
   进度条
   ======================================== */

.progress-bar {
  position: relative;
  width: 100%;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  cursor: pointer;
}

.progress-bar:hover {
  height: 6px;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-fast);
}

.progress-thumb {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 12px;
  height: 12px;
  background: white;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.progress-bar:hover .progress-thumb {
  opacity: 1;
}

/* ========================================
   滑块
   ======================================== */

.slider {
  position: relative;
  width: 100%;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  cursor: pointer;
}

.slider-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

.slider-thumb {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  background: white;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast);
}

.slider-thumb:hover,
.slider-thumb:active {
  transform: translate(-50%, -50%) scale(1.2);
}

/* ========================================
   图标样式
   ======================================== */

.icon {
  width: 1.5rem;
  height: 1.5rem;
  fill: currentColor;
  flex-shrink: 0;
  font-size: 1.5rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.1));
  transition: all var(--transition-fast);
}

.icon-sm {
  width: 1.25rem;
  height: 1.25rem;
  font-size: 1.25rem;
  opacity: 0.9;
}

.btn-icon-sm:hover .icon-sm {
  opacity: 1;
  transform: scale(1.1);
}

.icon-lg {
  width: 2.8rem;
  height: 2.8rem;
  font-size: 2.8rem;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.btn-icon-lg:hover .icon-lg {
  transform: scale(1.1);
}

.icon-xl {
  width: 3.5rem;
  height: 3.5rem;
  font-size: 3.5rem;
}

/* ========================================
   空状态
   ======================================== */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  text-align: center;
  color: var(--text-muted);
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state-title {
  font-size: var(--text-lg);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.empty-state-description {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* ========================================
   Toast 提示
   ======================================== */

.toast-container {
  position: fixed;
  top: var(--spacing-xl);
  right: var(--spacing-xl);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  pointer-events: none;
}

.toast {
  min-width: 280px;
  max-width: 400px;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  color: var(--text-primary);
  font-size: var(--text-base);
  line-height: 1.5;
  pointer-events: auto;
  animation: toastSlideIn 0.3s ease-out;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.toast.toast-hide {
  animation: toastSlideOut 0.3s ease-in forwards;
}

.toast-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: var(--font-semibold);
  margin-bottom: var(--spacing-xs);
}

.toast-message {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.toast-close {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-size: 1.2rem;
  line-height: 1;
  padding: 0;
}

.toast-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

/* Toast 类型 */
.toast-error {
  border-left: 4px solid #ef4444;
}

.toast-error .toast-icon {
  color: #ef4444;
}

.toast-success {
  border-left: 4px solid #10b981;
}

.toast-success .toast-icon {
  color: #10b981;
}

.toast-warning {
  border-left: 4px solid #f59e0b;
}

.toast-warning .toast-icon {
  color: #f59e0b;
}

.toast-info {
  border-left: 4px solid #3b82f6;
}

.toast-info .toast-icon {
  color: #3b82f6;
}

/* Toast 动画 */
@keyframes toastSlideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes toastSlideOut {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(400px);
    opacity: 0;
  }
}

/* 移动端适配 */
@media (max-width: 768px) {
  .toast-container {
    top: var(--spacing-md);
    right: var(--spacing-md);
    left: var(--spacing-md);
  }

  .toast {
    min-width: auto;
    max-width: none;
  }
}