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

:root {
  --primary-color: #3b82f6;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --info-color: #8b5cf6;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  line-height: 1.5;
  color: var(--text-primary);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
}

.app-container {
  max-width: 1600px;
  margin: 0 auto;
  background: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 1.5rem 2rem;
  position: relative;
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.subtitle {
  font-size: 0.9375rem;
  opacity: 0.9;
}

.header-links {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-switch {
  color: white;
  text-decoration: none;
  padding: 0.375rem 0.75rem;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 0.375rem;
  font-size: 0.875rem;
  transition: background 0.3s;
}

.lang-switch:hover {
  background: rgba(255, 255, 255, 0.3);
}

.github-link a {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  color: white;
  text-decoration: none;
  padding: 0.375rem 0.75rem;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 0.375rem;
  font-size: 0.875rem;
  transition: background 0.3s;
}

.github-link a:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 2rem;
}

/* Device Preview Section */
.device-preview-section {
  margin-bottom: 2rem;
}

.device-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
}

.device-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.device-label {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.viewport-value {
  font-size: 1.25rem;
  color: var(--primary-color);
}

.device-presets {
  display: flex;
  gap: 0.5rem;
}

.device-preset-btn {
  padding: 0.5rem 1rem;
  border: 2px solid var(--border-color);
  background: white;
  border-radius: 0.375rem;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s;
}

.device-preset-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.device-preset-btn.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* Device Frame */
.device-frame-wrapper {
  display: flex;
  justify-content: center;
  padding: 2rem 0;
  background: var(--bg-tertiary);
  border-radius: 0.75rem;
  min-height: 600px;
}

.device-frame {
  position: relative;
  background: white;
  border: 8px solid #2d3748;
  border-radius: 2rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
  width: 768px;
  max-width: 90vw;
  transition: width 0.3s ease;
  overflow: hidden;
}

.device-content {
  height: 100%;
  overflow-y: auto;
  padding: 1rem;
  background: linear-gradient(to bottom, #f8fafc 0%, #ffffff 100%);
}

.device-content::-webkit-scrollbar {
  width: 6px;
}

.device-content::-webkit-scrollbar-thumb {
  background: #cbd5e0;
  border-radius: 3px;
}

/* Units Container */
.units-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.unit-display-card {
  background: white;
  border: 2px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.unit-display-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.unit-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.unit-badge {
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  font-size: 0.6875rem;
  font-weight: 700;
  white-space: nowrap;
  /* text-transform: uppercase; */
}

.badge-primary {
  background: #dbeafe;
  color: #1e40af;
}

.badge-success {
  background: #d1fae5;
  color: #065f46;
}

.badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.badge-info {
  background: #ede9fe;
  color: #5b21b6;
}

.unit-display-box {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  background: #f0f0f0;
  border-radius: 0.5rem;
  margin-bottom: 0.75rem;
  position: relative;
  height: 50px;
  width: 100%;
  overflow: visible;
  border: 2px solid #ddd;
  margin-top: 8px;
}

/* 内部进度条 - 用 ::before 实现 */
#vpx-display-box::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  height: 100%;
  width: var(--bar-width, 30px);
  background: linear-gradient(90deg, #3b82f6 0%, #1e40af 100%);
  transition: width 0.05s linear;
  z-index: 1;
  box-shadow: 2px 0 8px rgba(59, 130, 246, 0.3);
  border-radius: 0.25rem;
}

#vpx-display-box {
  background: #e8f0fe;
  border: 2px solid #3b82f6;
}

#maxvpx-display-box::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  height: 100%;
  width: var(--bar-width, 30px);
  background: linear-gradient(90deg, #10b981 0%, #047857 100%);
  transition: width 0.05s linear;
  z-index: 1;
  box-shadow: 2px 0 8px rgba(16, 185, 129, 0.3);
  border-radius: 0.25rem;
}

#maxvpx-display-box {
  background: #f0fdf4;
  border: 2px solid #10b981;
}

#minvpx-display-box::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  height: 100%;
  width: var(--bar-width, 30px);
  background: linear-gradient(90deg, #f59e0b 0%, #d97706 100%);
  transition: width 0.05s linear;
  z-index: 1;
  box-shadow: 2px 0 8px rgba(245, 158, 11, 0.3);
  border-radius: 0.25rem;
}

#minvpx-display-box {
  background: #fffbeb;
  border: 2px solid #f59e0b;
}

#cvpx-display-box::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  height: 100%;
  width: var(--bar-width, 30px);
  background: linear-gradient(90deg, #ef4444 0%, #b91c1c 100%);
  transition: width 0.05s linear;
  z-index: 1;
  box-shadow: 2px 0 8px rgba(239, 68, 68, 0.3);
  border-radius: 0.25rem;
}

#cvpx-display-box {
  background: #fef2f2;
  border: 2px solid #ef4444;
}

#linear-vpx-display-box::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  height: 100%;
  width: var(--bar-width, 30px);
  background: linear-gradient(90deg, #8b5cf6 0%, #6d28d9 100%);
  transition: width 0.05s linear;
  z-index: 1;
  box-shadow: 2px 0 8px rgba(139, 92, 246, 0.3);
  border-radius: 0.25rem;
}

#linear-vpx-display-box {
  background: #faf5ff;
  border: 2px solid #8b5cf6;
}

.box-size-label {
  color: #fefefe;
  font-weight: 700;
  font-size: 0.875rem;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  pointer-events: none;
}

/* 超出容器宽度的警告指示器 */
.unit-display-box::after {
  content: '⚠';
  position: absolute;
  right: -28px;
  top: -12px;
  width: 24px;
  height: 24px;
  background: #ef4444;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: white;
  font-weight: bold;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.4);
  opacity: calc(var(--overflow, 0) * 1);
  transition: opacity 0.05s ease, transform 0.1s ease;
  pointer-events: none;
  z-index: 10;
  transform: scale(calc(0.6 + var(--overflow, 0) * 0.4));
}

.unit-display-info {
  font-size: 0.8125rem;
}

.formula-line {
  color: var(--primary-color);
  font-family: 'Monaco', 'Menlo', monospace;
  margin-bottom: 0.25rem;
  word-break: break-all;
}

.size-line {
  color: var(--text-secondary);
  font-weight: 500;
}

.semantic-hint {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.4;
}

.semantic-hint strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Resize Handle */
.device-resize-handle {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 20px;
  cursor: ew-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  background: linear-gradient(to right, transparent, rgba(59, 130, 246, 0.1));
  transition: background 0.2s;
}

.device-resize-handle:hover {
  background: linear-gradient(to right, transparent, rgba(59, 130, 246, 0.2));
}

.resize-line {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 40px;
  background: var(--primary-color);
  border-radius: 1px;
}

.resize-icon {
  position: absolute;
  right: 5px;
  font-size: 1.125rem;
  color: var(--primary-color);
  pointer-events: none;
}

/* Controls Section */
.controls-section {
  margin-top: 1.5rem;
}

.control-accordion {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1rem;
  margin-bottom: 1rem;
}

.control-accordion summary {
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control-accordion summary::-webkit-details-marker {
  display: none;
}

.control-accordion summary::before {
  content: '▶';
  display: inline-block;
  transition: transform 0.2s;
}

.control-accordion[open] summary::before {
  transform: rotate(90deg);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.control-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-item label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
}

.control-label {
  color: var(--text-secondary);
}

.control-value {
  color: var(--primary-color);
  font-size: 1rem;
}

.control-item input[type='range'] {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
}

.control-item input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--primary-color);
  cursor: pointer;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.control-item input[type='range']::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--primary-color);
  cursor: pointer;
  border-radius: 50%;
  border: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Chart */
.chart-wrapper {
  margin-top: 1rem;
}

#comparison-chart {
  width: 100%;
  height: 300px;
  background: white;
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  padding: 1.5rem 2rem;
  text-align: center;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  font-size: 0.875rem;
}

.footer a {
  color: var(--primary-color);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  .header {
    padding: 1rem;
  }

  .header h1 {
    font-size: 1.25rem;
  }

  .subtitle {
    font-size: 0.8125rem;
  }

  .header-links {
    position: static;
    margin-top: 0.75rem;
    justify-content: flex-start;
  }

  .main-content {
    padding: 1rem;
  }

  .device-toolbar {
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
  }

  .device-presets {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .device-frame-wrapper {
    padding: 1rem 0;
  }

  .controls-grid {
    grid-template-columns: 1fr;
  }
}