/**
 * UI Components - Super Player App
 * 基于 UI/UX Pro Max 专业方法论
 * 
 * 包含：Drawer、Toast、Modal、Button、Skeleton 等核心组件
 */

/* ========================================
   Drawer（右侧抽屉）
   ======================================== */

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, var(--backdrop-opacity));
  z-index: var(--z-drawer);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-spring);
}

.drawer-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.drawer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  max-height: 80vh;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-top-left-radius: 16px;
  border-top-right-radius: 16px;
  box-shadow: var(--shadow-2xl);
  z-index: calc(var(--z-drawer) + 1);
  transform: translateY(100%);
  transition: transform var(--duration-normal) var(--ease-spring);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

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

.drawer-header {
  padding: var(--spacing-5);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  min-height: var(--touch-target-min);
}

.drawer-title {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
}

.drawer-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: rgba(0, 0, 0, 0.05);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  padding: 0;
  position: relative;
}

.drawer-close:hover {
  background: rgba(0, 0, 0, 0.1);
  transform: scale(1.05);
}

.drawer-close:active {
  transform: scale(0.95);
}

.drawer-close::before,
.drawer-close::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 1px;
}

.drawer-close::before {
  transform: rotate(45deg);
}

.drawer-close::after {
  transform: rotate(-45deg);
}

.drawer-content {
  padding: var(--spacing-5);
  flex: 1;
  overflow-y: auto;
}

.drawer-footer {
  padding: var(--spacing-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: var(--spacing-3);
  flex-shrink: 0;
}

/* ========================================
   Toast（提示消息）
   ======================================== */

.toast-container {
  position: fixed;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
  pointer-events: none;
}

.toast {
  min-width: 280px;
  max-width: 90vw;
  padding: var(--spacing-4) var(--spacing-5);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  transform: translateY(-100%);
  transition: all var(--duration-normal) var(--ease-spring);
  pointer-events: auto;
}

.toast.active {
  opacity: 1;
  transform: translateY(0);
}

.toast-success {
  background: var(--color-success);
  color: white;
}

.toast-error {
  background: var(--color-error);
  color: white;
}

.toast-warning {
  background: var(--color-warning);
  color: white;
}

.toast-info {
  background: var(--color-info);
  color: white;
}

.toast-icon {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-bold);
  flex-shrink: 0;
  font-size: var(--text-sm);
}

.toast-message {
  flex: 1;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: var(--leading-normal);
}

/* ========================================
   Modal（模态对话框）
   ======================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-spring);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4);
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  width: min(90vw, 400px);
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  opacity: 0;
  transform: scale(0.9);
  transition: all var(--duration-normal) var(--ease-spring);
}

.modal-backdrop.active .modal {
  opacity: 1;
  transform: scale(1);
}

.modal-header {
  padding: var(--spacing-5);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  margin: 0;
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
}

.modal-content {
  padding: var(--spacing-5);
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
}

.modal-footer {
  padding: var(--spacing-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: var(--spacing-3);
  justify-content: flex-end;
}

/* ========================================
   Button（按钮）
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  min-height: var(--touch-target-min);
  padding: 0 var(--spacing-5);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  font-family: var(--font-family);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  position: relative;
  overflow: hidden;
  user-select: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

/* Button 变体 */
.btn-primary {
  background: linear-gradient(180deg, var(--color-primary-hover), var(--color-primary));
  color: #20170a;
  box-shadow: 0 4px 12px rgba(255, 184, 0, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(180deg, #FFE08A, var(--color-primary-hover));
  box-shadow: 0 6px 16px rgba(255, 184, 0, 0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: rgba(255, 184, 0, 0.1);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
}

.btn-ghost:hover {
  background: rgba(0, 0, 0, 0.05);
}

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

.btn-danger:hover {
  background: #DC2626;
}

/* Button 状态 */
.btn:disabled,
.btn-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-loading {
  pointer-events: none;
  position: relative;
  color: transparent;
}

.btn-loading::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: currentColor;
  border-radius: var(--radius-full);
  animation: spinner 600ms linear infinite;
}

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

/* Button 尺寸 */
.btn-sm {
  min-height: 36px;
  padding: 0 var(--spacing-4);
  font-size: var(--text-sm);
}

.btn-lg {
  min-height: 52px;
  padding: 0 var(--spacing-6);
  font-size: var(--text-lg);
}

/* ========================================
   Skeleton（骨架屏）
   ======================================== */

.skeleton {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.05) 0%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(255, 255, 255, 0.05) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

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

.skeleton-text {
  height: 1em;
  margin-bottom: var(--spacing-2);
}

.skeleton-title {
  height: 1.5em;
  width: 60%;
  margin-bottom: var(--spacing-3);
}

.skeleton-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
}

.skeleton-card {
  height: 200px;
  border-radius: var(--radius-lg);
}

/* ========================================
   Ripple Effect（波纹效果）
   ======================================== */

.ripple-container {
  position: relative;
  overflow: hidden;
}

.ripple {
  position: absolute;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.5);
  transform: scale(0);
  animation: ripple-animation 600ms ease-out;
  pointer-events: none;
}

@keyframes ripple-animation {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* ========================================
   Form Components（表单组件）
   ======================================== */

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-4);
}

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

.form-label .required {
  color: var(--color-error);
  margin-left: var(--spacing-1);
}

.form-input,
.form-textarea,
.form-select {
  min-height: var(--touch-target-min);
  padding: var(--spacing-3) var(--spacing-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  font-family: var(--font-family);
  transition: all var(--duration-fast) var(--ease-out);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 184, 0, 0.1);
}

.form-input[aria-invalid="true"],
.form-textarea[aria-invalid="true"] {
  border-color: var(--color-error);
}

.form-error {
  font-size: var(--text-sm);
  color: var(--color-error);
  margin: 0;
}

.form-helper {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* ========================================
   Utility Classes（工具类）
   ======================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.pointer-events-none {
  pointer-events: none;
}

.cursor-pointer {
  cursor: pointer;
}

.cursor-not-allowed {
  cursor: not-allowed;
}

.select-none {
  user-select: none;
}