:root {
  --primary-color: #4361ee;
  --secondary-color: #3f37c9;
  --success-color: #4cc9f0;
  --danger-color: #f72585;
  --warning-color: #f8961e;
  --info-color: #4895ef;
  --light-color: #f8f9fa;
  --dark-color: #212529;
  --white-color: #ffffff;
  --gray-color: #6c757d;
  --border-color: #dee2e6;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.1);
  --border-radius: 10px;
  --transition: all 0.3s ease;
}

body {
  font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  min-height: 100vh;
  color: var(--dark-color);
}

.container {
  background: var(--white-color);
  padding: 30px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

h1 {
  text-align: center;
  color: var(--primary-color);
  margin-bottom: 30px;
  font-weight: 600;
  font-size: 2.2rem;
}

.warning {
  background-color: #fff3cd;
  padding: 20px;
  margin: 20px 0;
  border: 1px solid #ffeeba;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.warning ul {
  margin: 10px 0;
  padding-left: 20px;
}

.warning code {
  background-color: #f8f9fa;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.video-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin: 30px 0;
}

.video-preview {
  padding: 20px;
  background: var(--light-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.video-controls {
  padding: 20px;
  background: var(--light-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.preview-title {
  font-size: 1.3em;
  margin-bottom: 15px;
  color: var(--secondary-color);
  font-weight: 600;
}

.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--dark-color);
  font-weight: 500;
}

input[type="file"],
input[type="number"],
select {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  margin-bottom: 10px;
  font-size: 1rem;
  transition: var(--transition);
  box-sizing: border-box;
}

input[type="file"]:focus,
input[type="number"]:focus,
select:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.button {
  padding: 12px 25px;
  margin: 8px 5px;
  background-color: var(--primary-color);
  color: var(--white-color);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  font-size: 1rem;
  font-weight: 500;
  box-shadow: var(--shadow);
}

.button:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

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

.button:disabled {
  background-color: var(--gray-color);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.button.download {
  background-color: var(--success-color);
}

.button.download:hover {
  background-color: #38b2d0;
}

#status {
  margin: 20px 0;
  padding: 15px;
  border-radius: var(--border-radius);
  background: var(--light-color);
  color: var(--dark-color);
  text-align: center;
  font-weight: 500;
  box-shadow: var(--shadow);
}

progress {
  width: 100%;
  height: 20px;
  margin: 15px 0;
  border-radius: 10px;
  overflow: hidden;
}

progress::-webkit-progress-bar {
  background-color: var(--light-color);
  border-radius: 10px;
}

progress::-webkit-progress-value {
  background-color: var(--primary-color);
  border-radius: 10px;
}

video {
  width: 100%;
  border-radius: var(--border-radius);
  background: #000;
  box-shadow: var(--shadow);
}

/* 标签页样式 */
.tabs {
  display: flex;
  margin-bottom: 25px;
  border-bottom: 2px solid var(--border-color);
  gap: 5px;
}

.tab-button {
  padding: 12px 25px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--gray-color);
  position: relative;
  font-weight: 500;
  transition: var(--transition);
  border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.tab-button:hover {
  color: var(--primary-color);
}

.tab-button.active {
  color: var(--primary-color);
  background-color: rgba(67, 97, 238, 0.1);
}

.tab-button.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary-color);
}

.tab-content {
  display: none;
  padding: 25px 0;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.tab-content.active {
  display: block;
}

/* 音频格式选择器样式 */
.format-selector {
  margin: 25px 0;
}

.format-selector label {
  font-weight: 500;
  color: var(--dark-color);
  margin-bottom: 10px;
  display: block;
}

.radio-group {
  display: flex;
  gap: 25px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.radio-group input[type="radio"] {
  margin-right: 8px;
}

.radio-group label {
  display: flex;
  align-items: center;
  margin-bottom: 0;
  cursor: pointer;
  font-weight: normal;
}

/* 音频质量选择器样式 */
.quality-selector {
  margin: 25px 0;
}

.quality-selector label {
  font-weight: 500;
  color: var(--dark-color);
  margin-bottom: 10px;
  display: block;
}

select {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1em;
  appearance: none;
}

/* 字幕清理样式 */
.subtitle-cleaner {
  background: var(--white-color);
  padding: 25px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin-top: 25px;
}

.subtitle-preview {
  background: var(--light-color);
  border-radius: var(--border-radius);
  padding: 20px;
  margin-top: 15px;
  max-height: 300px;
  overflow-y: auto;
  white-space: pre-wrap;
  font-family: monospace;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}

/* 弹幕分析样式 */
.danmaku-analysis {
  background: var(--white-color);
  padding: 25px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin-top: 30px;
}

.danmaku-analysis h2 {
  color: var(--primary-color);
  margin-top: 0;
}

.analysis-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px;
  margin-top: 25px;
}

.danmaku-item {
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
}

.danmaku-item .time {
  color: var(--info-color);
  margin-right: 15px;
  font-weight: 500;
  min-width: 80px;
}

/* 添加移动端适配样式 */
@media screen and (max-width: 768px) {
  body {
    padding: 10px;
  }

  .container {
    padding: 15px;
  }

  .video-container {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .video-controls,
  .video-preview {
    width: 100%;
  }

  h1 {
    font-size: 1.8rem;
    margin-bottom: 20px;
  }

  .warning {
    font-size: 0.9rem;
    padding: 15px;
  }

  .button {
    width: 100%;
    margin: 5px 0;
    padding: 15px;
    font-size: 1.1rem;
  }

  .input-group {
    margin-bottom: 15px;
  }

  input[type="file"],
  input[type="number"] {
    font-size: 1rem;
    padding: 12px;
  }

  .preview-title {
    font-size: 1.1rem;
  }

  video {
    max-height: 200px;
    object-fit: contain;
  }

  #status {
    font-size: 0.9rem;
  }

  progress {
    height: 15px;
  }

  .tabs {
    flex-wrap: wrap;
  }

  .tab-button {
    padding: 10px 15px;
    font-size: 0.9rem;
    margin-bottom: 5px;
  }

  .radio-group {
    flex-direction: column;
    gap: 15px;
  }

  .analysis-container {
    grid-template-columns: 1fr;
  }
}

/* 添加中等屏幕尺寸的适配 */
@media screen and (min-width: 769px) and (max-width: 1024px) {
  body {
    padding: 15px;
  }

  .container {
    padding: 20px;
  }

  .video-container {
    gap: 20px;
  }

  .button {
    padding: 10px 20px;
  }

  .analysis-container {
    gap: 20px;
  }
}

/* 添加横屏模式的特殊处理 */
@media screen and (max-width: 768px) and (orientation: landscape) {
  .video-container {
    grid-template-columns: 1fr;
  }

  .video-controls,
  .video-preview {
    width: 100%;
  }

  video {
    max-height: 150px;
  }
}

/* 添加触摸优化 */
@media (hover: none) {
  .button {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }

  input[type="number"] {
    font-size: 16px; /* 防止 iOS 自动缩放 */
  }
}

/* 优化可访问性 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}