index.css

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;700&display=swap');

@tailwind base;
@tailwind components;
@tailwind utilities;

/* Accessibility improvements */
@layer base {
  body {
    font-family: 'Noto Sans SC', ui-sans-serif, system-ui, Helvetica Neue, Arial, Noto Sans, sans-serif;
    background-color: #f9fafb;
    color: #1f2937;
    line-height: 1.5;
  }
  /* Screen reader only content */
  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  /* Focus styles for better keyboard navigation */
  :focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
  }

  /* High contrast mode support */
  @media (prefers-contrast: high) {
    .bg-gray-50 {
      background-color: #ffffff;
    }
    .text-gray-500 {
      color: #000000;
    }
    .border-gray-300 {
      border-color: #000000;
    }
  }

  /* Reduced motion support */
  @media (prefers-reduced-motion: reduce) {
    * {
      animation: none !important;
      transition: none !important;
    }
  }

  /* Skip link for keyboard navigation */
  .skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: #000;
    color: #fff;
    padding: 8px;
    text-decoration: none;
    z-index: 1000;
    border-radius: 4px;
  }

  .skip-link:focus {
    top: 6px;
  }
}

/* Custom styles */
.chart-container {
  position: relative;
  height: 440px;
  width: 100%;
}

/* Custom styles */
.chart-container {
  position: relative;
  height: 440px;
  width: 100%;
}

.chart-panel {
  position: relative;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.resizable-chart-container {
  position: relative;
  min-height: 200px;
  max-height: 600px;
  resize: vertical;
  overflow: hidden;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
}

.resize-handle {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 24px;
  height: 24px;
  cursor: nw-resize;
  background: linear-gradient(-45deg, transparent 35%, #9ca3af 35%, #9ca3af 45%, transparent 45%, transparent 55%, #9ca3af 55%, #9ca3af 65%, transparent 65%);
  opacity: 0.6;
  border-bottom-right-radius: 8px;
  border: none;
}

.resize-handle:hover,
.resize-handle:focus {
  opacity: 1;
  background: linear-gradient(-45deg, transparent 35%, #6b7280 35%, #6b7280 45%, transparent 45%, transparent 55%, #6b7280 55%, #6b7280 65%, transparent 65%);
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
}

.chart-panel {
  position: relative;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.drag-area {
  border: 2px dashed #e2e8f0;
}

.drag-area.dragover {
  border-color: #3b82f6;
  background-color: #dbeafe;
}

/* Enhanced focus indicators for interactive elements */
button:focus,
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

/* Enhanced hover effects for interactive elements */
label:hover input[type="checkbox"] + span,
label:hover input[type="radio"] + span {
  color: #1f2937;
}

/* Improved contrast for links */
a {
  text-decoration-skip-ink: auto;
}

a:hover {
  text-decoration: underline;
}

/* Better button accessibility */
button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Form improvements */
input[type="radio"]:focus,
input[type="checkbox"]:focus {
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
}

/* 全页面拖拽动画 */
@keyframes dragOverlayFadeIn {
  from { 
    opacity: 0; 
  }
  to { 
    opacity: 1; 
  }
}

@keyframes dragModalScaleIn {
  from { 
    opacity: 0; 
    transform: scale(0.95) translateY(10px); 
  }
  to { 
    opacity: 1; 
    transform: scale(1) translateY(0); 
  }
}

@keyframes dragIconBounce {
  0%, 20%, 53%, 80%, 100% {
    transform: translateY(0);
  }
  40%, 43% {
    transform: translateY(-8px);
  }
  70% {
    transform: translateY(-4px);
  }
  90% {
    transform: translateY(-2px);
  }
}

.drag-overlay-fade-in {
  animation: dragOverlayFadeIn 0.1s ease-out;
}

.drag-modal-scale-in {
  animation: dragModalScaleIn 0.15s ease-out;
}

.drag-icon-bounce {
  animation: dragIconBounce 1s infinite;
}

/* 在减少动画偏好设置下禁用拖拽动画 */
@media (prefers-reduced-motion: reduce) {
  .drag-overlay-fade-in,
  .drag-modal-scale-in,
  .drag-icon-bounce {
    animation: none !important;
  }
}