/**
 * Num2Han - 數字轉國字轉換工具
 * 作用域限定 CSS - 所有類別使用 num2han- 前綴
 * 不影響全局元素，可安全嵌入任何網頁
 */

/* ========================================
   CSS 變數（限定在容器內）
   ======================================== */
.num2han-container {
  /* 色彩系統 */
  --n2h-color-primary: #6366f1;
  --n2h-color-primary-hover: #4f46e5;
  --n2h-color-primary-light: #e0e7ff;

  --n2h-color-success: #10b981;
  --n2h-color-success-light: #d1fae5;

  --n2h-color-error: #ef4444;
  --n2h-color-error-light: #fee2e2;

  --n2h-color-warning: #f59e0b;
  --n2h-color-warning-light: #fef3c7;

  /* 中性色 */
  --n2h-color-gray-50: #f8fafc;
  --n2h-color-gray-100: #f1f5f9;
  --n2h-color-gray-200: #e2e8f0;
  --n2h-color-gray-300: #cbd5e1;
  --n2h-color-gray-400: #94a3b8;
  --n2h-color-gray-500: #64748b;
  --n2h-color-gray-600: #475569;
  --n2h-color-gray-700: #334155;
  --n2h-color-gray-800: #1e293b;
  --n2h-color-gray-900: #0f172a;

  /* 背景與前景 */
  --n2h-bg-primary: #ffffff;
  --n2h-bg-secondary: var(--n2h-color-gray-50);
  --n2h-bg-tertiary: var(--n2h-color-gray-100);
  --n2h-text-primary: var(--n2h-color-gray-900);
  --n2h-text-secondary: var(--n2h-color-gray-600);
  --n2h-text-tertiary: var(--n2h-color-gray-400);

  /* 邊框顏色 */
  --n2h-border-color: var(--n2h-color-gray-200);

  /* 間距 */
  --n2h-spacing-xs: 0.25rem;
  --n2h-spacing-sm: 0.5rem;
  --n2h-spacing-md: 1rem;
  --n2h-spacing-lg: 1.5rem;
  --n2h-spacing-xl: 2rem;
  --n2h-spacing-2xl: 3rem;

  /* 圓角 */
  --n2h-radius-sm: 0.375rem;
  --n2h-radius-md: 0.5rem;
  --n2h-radius-lg: 0.75rem;
  --n2h-radius-xl: 1rem;
  --n2h-radius-full: 9999px;

  /* 陰影 - 更柔和的陰影 */
  --n2h-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.03);
  --n2h-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --n2h-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.05), 0 4px 6px -4px rgb(0 0 0 / 0.05);
  --n2h-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.08), 0 8px 10px -6px rgb(0 0 0 / 0.05);

  /* 過渡 */
  --n2h-transition-fast: 150ms ease;
  --n2h-transition-normal: 250ms ease;
  --n2h-transition-slow: 350ms ease;

  /* 字體 */
  --n2h-font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --n2h-font-size-xs: 0.75rem;
  --n2h-font-size-sm: 0.875rem;
  --n2h-font-size-base: 1rem;
  --n2h-font-size-lg: 1.125rem;
  --n2h-font-size-xl: 1.25rem;
  --n2h-font-size-2xl: 1.5rem;
  --n2h-font-size-3xl: 2rem;
}

/* ========================================
   容器基礎樣式（限定作用域）
   ======================================== */
.num2han-container {
  font-family: var(--n2h-font-family);
  font-size: var(--n2h-font-size-base);
  line-height: 1.6;
  color: var(--n2h-text-primary);
  box-sizing: border-box;
}

.num2han-container *,
.num2han-container *::before,
.num2han-container *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ========================================
   App 容器
   ======================================== */
.num2han-app {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--n2h-spacing-xs);
  display: flex;
  flex-direction: column;
  gap: var(--n2h-spacing-xs);
}

/* ========================================
   Header
   ======================================== */
.num2han-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--n2h-spacing-sm) var(--n2h-spacing-md);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: var(--n2h-radius-md);
  box-shadow: var(--n2h-shadow-sm);
}

.num2han-header-content {
  display: flex;
  flex-direction: column;
  gap: var(--n2h-spacing-xs);
}

.num2han-logo {
  display: flex;
  align-items: center;
  gap: var(--n2h-spacing-sm);
  color: white;
  font-size: var(--n2h-font-size-xl);
}

.num2han-logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border-radius: var(--n2h-radius-md);
  font-size: var(--n2h-font-size-base);
}

.num2han-tagline {
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--n2h-font-size-xs);
}

.num2han-settings-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: white;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  border-radius: var(--n2h-radius-full);
  cursor: pointer;
  transition: background var(--n2h-transition-fast);
}

.num2han-settings-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* ========================================
   Main Content
   ======================================== */
.num2han-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* ========================================
   Input Panel
   ======================================== */
.num2han-input-panel {
  background: var(--n2h-bg-primary);
  border-radius: var(--n2h-radius-md);
  padding: var(--n2h-spacing-sm);
  border: 2px solid #667eea;
  box-shadow: var(--n2h-shadow-sm);
  margin: 5px 0;
}

.num2han-output-panel {
  border-color: #10b981;
}

.num2han-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--n2h-spacing-xs);
}

.num2han-panel-label {
  font-size: var(--n2h-font-size-sm);
  font-weight: 500;
  color: var(--n2h-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--n2h-spacing-sm);
}

.num2han-style-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  background: var(--n2h-color-primary-light);
  color: var(--n2h-color-primary);
  font-size: var(--n2h-font-size-xs);
  font-weight: 500;
  border-radius: var(--n2h-radius-full);
}

.num2han-clear-btn,
.num2han-copy-btn {
  display: flex;
  align-items: center;
  gap: var(--n2h-spacing-xs);
  padding: var(--n2h-spacing-sm) var(--n2h-spacing-md);
  color: var(--n2h-text-secondary);
  background: none;
  border: none;
  border-radius: var(--n2h-radius-md);
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  transition: all var(--n2h-transition-fast);
}

.num2han-clear-btn:hover {
  background: var(--n2h-color-error-light);
  color: var(--n2h-color-error);
}

.num2han-copy-btn:hover {
  background: var(--n2h-color-primary-light);
  color: var(--n2h-color-primary);
}

.num2han-copy-text,
.num2han-clear-text {
  font-size: var(--n2h-font-size-sm);
}

.num2han-input-wrapper {
  position: relative;
}

.num2han-input-field {
  width: 100%;
  padding: var(--n2h-spacing-md);
  border: 2px solid var(--n2h-color-gray-200);
  border-radius: var(--n2h-radius-lg);
  font-family: inherit;
  font-size: var(--n2h-font-size-lg);
  line-height: 1.5;
  resize: none;
  transition: border-color var(--n2h-transition-fast), box-shadow var(--n2h-transition-fast);
  background: var(--n2h-bg-primary);
}

.num2han-input-field:focus {
  outline: none;
  border-color: var(--n2h-color-primary);
  box-shadow: 0 0 0 3px var(--n2h-color-primary-light);
}

.num2han-input-field::placeholder {
  color: var(--n2h-text-tertiary);
}

.num2han-input-field.num2han-error {
  border-color: var(--n2h-color-error);
}

.num2han-input-field.num2han-error:focus {
  box-shadow: 0 0 0 3px var(--n2h-color-error-light);
}

.num2han-output-field {
  background: var(--n2h-bg-secondary);
  font-weight: 500;
}

.num2han-status-bar {
  min-height: 1.25rem;
  margin-top: var(--n2h-spacing-xs);
  font-size: var(--n2h-font-size-xs);
  color: var(--n2h-text-secondary);
}

.num2han-status-bar.num2han-success {
  color: var(--n2h-color-success);
}

.num2han-status-bar.num2han-error {
  color: var(--n2h-color-error);
}

.num2han-status-bar.num2han-warning {
  color: var(--n2h-color-warning);
}

/* ========================================
   Quick Settings
   ======================================== */
.num2han-quick-settings {
  margin-top: var(--n2h-spacing-sm);
  padding-top: var(--n2h-spacing-sm);
  border-top: 1px solid var(--n2h-color-gray-200);
}

.num2han-setting-group {
  display: flex;
  align-items: center;
  gap: var(--n2h-spacing-md);
}

.num2han-setting-label {
  font-size: var(--n2h-font-size-sm);
  color: var(--n2h-text-secondary);
  flex-shrink: 0;
}

.num2han-toggle-group {
  display: flex;
  background: var(--n2h-bg-tertiary);
  border-radius: var(--n2h-radius-md);
  padding: 2px;
}

.num2han-toggle-btn {
  padding: var(--n2h-spacing-sm) var(--n2h-spacing-md);
  font-family: inherit;
  font-size: var(--n2h-font-size-sm);
  color: var(--n2h-text-secondary);
  background: none;
  border: none;
  border-radius: var(--n2h-radius-sm);
  cursor: pointer;
  transition: all var(--n2h-transition-fast);
}

.num2han-toggle-btn:hover {
  color: var(--n2h-text-primary);
}

.num2han-toggle-btn.num2han-active {
  background: var(--n2h-bg-primary);
  color: var(--n2h-color-primary);
  font-weight: 500;
  box-shadow: var(--n2h-shadow-sm);
}

/* ========================================
   Swap Button
   ======================================== */
.num2han-swap-container {
  display: flex;
  justify-content: center;
  margin: 2px 0;
}

.num2han-swap-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border: none;
  border-radius: var(--n2h-radius-full);
  box-shadow: var(--n2h-shadow-sm);
  color: white;
  cursor: pointer;
  transition: all var(--n2h-transition-fast);
}

.num2han-swap-btn svg {
  width: 18px;
  height: 18px;
}

.num2han-swap-btn:hover {
  transform: scale(1.1);
  box-shadow: var(--n2h-shadow-md);
}

.num2han-swap-btn:active {
  transform: scale(0.95);
}

/* ========================================
   History Panel
   ======================================== */
.num2han-history-panel {
  background: var(--n2h-bg-primary);
  border-radius: var(--n2h-radius-md);
  padding: var(--n2h-spacing-sm);
  border: 2px solid #f59e0b;
  box-shadow: var(--n2h-shadow-sm);
}

.num2han-history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--n2h-spacing-xs);
}

.num2han-history-title {
  display: flex;
  align-items: center;
  gap: var(--n2h-spacing-sm);
  font-size: var(--n2h-font-size-base);
  font-weight: 600;
  color: var(--n2h-text-primary);
}

.num2han-clear-history-btn {
  font-family: inherit;
  font-size: var(--n2h-font-size-sm);
  color: var(--n2h-text-tertiary);
  background: none;
  border: none;
  padding: var(--n2h-spacing-xs) var(--n2h-spacing-sm);
  border-radius: var(--n2h-radius-sm);
  cursor: pointer;
  transition: all var(--n2h-transition-fast);
}

.num2han-clear-history-btn:hover {
  background: var(--n2h-color-error-light);
  color: var(--n2h-color-error);
}

.num2han-history-list {
  list-style: none;
  max-height: 200px;
  overflow-y: auto;
}

.num2han-history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--n2h-spacing-sm) var(--n2h-spacing-md);
  margin-bottom: var(--n2h-spacing-xs);
  background: var(--n2h-bg-secondary);
  border-radius: var(--n2h-radius-md);
  cursor: pointer;
  transition: background var(--n2h-transition-fast);
}

.num2han-history-item:hover {
  background: var(--n2h-color-primary-light);
}

.num2han-history-arabic {
  font-family: monospace;
  color: var(--n2h-text-secondary);
  font-size: var(--n2h-font-size-sm);
}

.num2han-history-chinese {
  font-weight: 500;
  color: var(--n2h-text-primary);
  font-size: var(--n2h-font-size-sm);
}

.num2han-history-empty {
  text-align: center;
  color: var(--n2h-text-tertiary);
  padding: var(--n2h-spacing-lg);
  font-size: var(--n2h-font-size-sm);
}

.num2han-history-notice {
  text-align: center;
  color: var(--n2h-text-tertiary);
  font-size: var(--n2h-font-size-xs);
  margin-top: var(--n2h-spacing-md);
}

/* ========================================
   Modal
   ======================================== */
.num2han-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--n2h-spacing-md);
  z-index: 999999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--n2h-transition-normal);
}

.num2han-modal-overlay.num2han-active {
  opacity: 1;
  visibility: visible;
}

.num2han-modal-content {
  background: var(--n2h-bg-primary);
  border-radius: var(--n2h-radius-xl);
  max-width: 480px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--n2h-shadow-xl);
  transform: translateY(20px);
  transition: transform var(--n2h-transition-normal);
}

.num2han-modal-overlay.num2han-active .num2han-modal-content {
  transform: translateY(0);
}

.num2han-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--n2h-spacing-lg);
  border-bottom: 1px solid var(--n2h-color-gray-200);
}

.num2han-modal-header h2 {
  font-size: var(--n2h-font-size-xl);
  font-weight: 600;
  margin: 0;
}

.num2han-modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--n2h-spacing-xs);
  min-width: 36px;
  min-height: 36px;
  padding: var(--n2h-spacing-sm) var(--n2h-spacing-md);
  color: var(--n2h-text-secondary);
  background: var(--n2h-color-gray-100);
  border: none;
  border-radius: var(--n2h-radius-md);
  cursor: pointer;
  transition: all var(--n2h-transition-fast);
  font-family: inherit;
  font-size: var(--n2h-font-size-sm);
}

.num2han-modal-close:hover {
  background: var(--n2h-color-gray-200);
  color: var(--n2h-text-primary);
}

.num2han-close-text {
  font-weight: 500;
}

.num2han-modal-body {
  padding: var(--n2h-spacing-lg);
}

.num2han-settings-section {
  margin-bottom: var(--n2h-spacing-xl);
}

.num2han-settings-section:last-child {
  margin-bottom: 0;
}

.num2han-settings-section h3 {
  font-size: var(--n2h-font-size-sm);
  font-weight: 600;
  color: var(--n2h-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 var(--n2h-spacing-md) 0;
}

.num2han-setting-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--n2h-spacing-md) 0;
  border-bottom: 1px solid var(--n2h-color-gray-100);
}

.num2han-setting-row:last-child {
  border-bottom: none;
}

.num2han-setting-info label {
  font-weight: 500;
  color: var(--n2h-text-primary);
}

.num2han-setting-desc {
  font-size: var(--n2h-font-size-sm);
  color: var(--n2h-text-tertiary);
  margin-top: var(--n2h-spacing-xs);
}

.num2han-setting-select {
  padding: var(--n2h-spacing-sm) var(--n2h-spacing-md);
  border: 1px solid var(--n2h-color-gray-300);
  border-radius: var(--n2h-radius-md);
  background: var(--n2h-bg-primary);
  font-family: inherit;
  font-size: var(--n2h-font-size-sm);
  color: var(--n2h-text-primary);
  cursor: pointer;
  min-width: 180px;
}

.num2han-setting-select:focus {
  outline: none;
  border-color: var(--n2h-color-primary);
  box-shadow: 0 0 0 2px var(--n2h-color-primary-light);
}

.num2han-modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--n2h-spacing-md);
  padding: var(--n2h-spacing-lg);
  border-top: 1px solid var(--n2h-color-gray-200);
}

/* ========================================
   Buttons
   ======================================== */
.num2han-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--n2h-spacing-sm) var(--n2h-spacing-lg);
  font-family: inherit;
  font-weight: 500;
  font-size: inherit;
  border: none;
  border-radius: var(--n2h-radius-md);
  cursor: pointer;
  transition: all var(--n2h-transition-fast);
}

.num2han-btn-primary {
  background: var(--n2h-color-primary);
  color: white;
}

.num2han-btn-primary:hover {
  background: var(--n2h-color-primary-hover);
}

.num2han-btn-secondary {
  background: var(--n2h-color-gray-100);
  color: var(--n2h-text-secondary);
}

.num2han-btn-secondary:hover {
  background: var(--n2h-color-gray-200);
  color: var(--n2h-text-primary);
}

/* 儲存按鈕成功特效 */
.num2han-btn-success-flash {
  background: var(--n2h-color-success) !important;
  color: white !important;
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.5);
}

.num2han-btn-flash {
  animation: num2han-btn-pulse 0.5s ease;
}

.num2han-save-icon {
  display: inline-block;
  margin-right: var(--n2h-spacing-xs);
  animation: num2han-checkmark-pop 0.3s ease;
}

@keyframes num2han-btn-pulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

@keyframes num2han-checkmark-pop {
  0% {
    transform: scale(0);
    opacity: 0;
  }

  50% {
    transform: scale(1.3);
  }

  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ========================================
   Toast
   ======================================== */
.num2han-toast {
  position: fixed;
  bottom: var(--n2h-spacing-xl);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--n2h-color-gray-800);
  color: white;
  padding: var(--n2h-spacing-md) var(--n2h-spacing-lg);
  border-radius: var(--n2h-radius-lg);
  box-shadow: var(--n2h-shadow-lg);
  font-size: var(--n2h-font-size-sm);
  font-weight: 500;
  z-index: 1000000;
  opacity: 0;
  transition: all var(--n2h-transition-normal);
}

.num2han-toast.num2han-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.num2han-toast.num2han-success {
  background: var(--n2h-color-success);
}

.num2han-toast.num2han-error {
  background: var(--n2h-color-error);
}

/* ========================================
   Footer
   ======================================== */
.num2han-footer {
  text-align: center;
  padding: var(--n2h-spacing-xl) 0 var(--n2h-spacing-lg);
  color: var(--n2h-text-secondary);
  font-size: var(--n2h-font-size-sm);
}

.num2han-disclaimer {
  margin-bottom: var(--n2h-spacing-sm);
  color: var(--n2h-text-primary);
}

.num2han-copyright {
  font-size: var(--n2h-font-size-xs);
  color: var(--n2h-text-tertiary);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 480px) {
  .num2han-app {
    padding: var(--n2h-spacing-sm);
  }

  .num2han-header {
    padding: var(--n2h-spacing-md);
  }

  .num2han-logo {
    font-size: var(--n2h-font-size-xl);
  }

  .num2han-logo-icon {
    width: 40px;
    height: 40px;
  }

  .num2han-input-panel {
    padding: var(--n2h-spacing-md);
  }

  .num2han-input-field {
    font-size: var(--n2h-font-size-base);
  }

  .num2han-setting-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--n2h-spacing-sm);
  }

  .num2han-setting-select {
    width: 100%;
  }

  .num2han-modal-footer {
    flex-direction: column;
  }

  .num2han-modal-footer .num2han-btn {
    width: 100%;
  }
}

/* ========================================
   Accessibility
   ======================================== */
@media (prefers-reduced-motion: reduce) {

  .num2han-container *,
  .num2han-container *::before,
  .num2han-container *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.num2han-container :focus-visible {
  outline: 2px solid var(--n2h-color-primary);
  outline-offset: 2px;
}