:root #tool-body {
  --bg-color: #f5f7fa;
  --card-bg: #ffffff;
  --primary: #16baaa;
  --dark-item: #2b2d36;
  --border-color: #eee;
  --text-sub: #999;
  --section-bg: #f8f9fa;
}
.theme-dark-mode #tool-body {
  --card-bg: #2b2b2b;
  --border-color: #444;
  --text-sub: #888;
  --section-bg: #333;
}

#tool-body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* ===== 上传区 ===== */
#tool-body .upload-area {
  padding: 40px;
  text-align: center;
  border-radius: 8px;
  border-width: 2px;
  cursor: pointer;
  transition: .3s;
  display: block;
  color: inherit;
}
#tool-body .upload-area:hover { border-color: var(--primary); }
#tool-body .upload-icon { font-size: 48px; color: var(--primary); margin-bottom: 10px; }
#tool-body .upload-area h3 { margin-bottom: 5px; }
#tool-body .upload-area p { color: var(--text-sub); font-size: 14px; }

/* ===== 已上传音频卡片 ===== */
#tool-body .audio-card {
  background: var(--dark-item); color: #fff; border-radius: 8px; padding: 15px 18px;
  display: flex; align-items: center; gap: 14px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15); position: relative; overflow: hidden; margin-top: 16px;
}
#tool-body .audio-card .play-btn {
  width: 40px; height: 40px; background: rgba(255,255,255,0.12); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; cursor: pointer; flex-shrink: 0; transition: 0.2s; z-index:1;
}
#tool-body .audio-card .play-btn:hover { background: var(--primary); transform: scale(1.1); }
#tool-body .audio-card .play-btn i { font-size: 20px; color: #fff; }
#tool-body .audio-info { flex: 1; min-width: 0; z-index:1; }
#tool-body .audio-card .file-name { font-size: 14px; font-weight: bold; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#tool-body .audio-card .file-meta { font-size: 12px; color: #bbb; margin-top: 3px; }
#tool-body .audio-card .badge-ext { background: #ffb800; color: #333; padding: 0 5px; border-radius: 3px; font-size: 10px; margin-left: 6px; font-weight: bold; }
#tool-body .audio-card .del-btn { z-index:1; color: #ff5722; cursor: pointer; font-size: 20px; opacity: 0.6; transition: 0.2s; padding: 8px; flex-shrink: 0; }
#tool-body .audio-card .del-btn:hover { opacity: 1; transform: scale(1.1); }
#tool-body .audio-card .waveform-box { height: 50px; width: 100%; position: absolute; top: 0; left: 0; opacity: 0.35; pointer-events: none; }

/* ===== 控制面板 ===== */
#tool-body .control-panel {
  background: var(--card-bg); border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06); margin-top: 20px;
  border: 1px solid var(--border-color); overflow: hidden;
}
#tool-body .panel-header {
  padding: 14px 20px; background: var(--section-bg);
  border-bottom: 1px solid var(--border-color);
  font-weight: bold; font-size: 15px; display: flex; align-items: center; gap: 8px;
}
#tool-body .panel-header i { color: var(--primary); font-size: 18px; }
#tool-body .panel-body { padding: 20px; }

/* ===== 背景设置 ===== */
#tool-body .bg-tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
#tool-body .bg-tab {
  padding: 6px 16px; border-radius: 20px; border: 1px solid var(--border-color);
  cursor: pointer; font-size: 13px; transition: 0.2s; background: var(--card-bg);
  color: inherit;
}
#tool-body .bg-tab.active, #tool-body .bg-tab:hover { border-color: var(--primary); color: var(--primary); background: rgba(22,186,170,0.06); }

#tool-body .bg-panel { display: none; }
#tool-body .bg-panel.active { display: block; }

/* 纯色 */
#tool-body .color-swatches { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
#tool-body .color-swatch {
  width: 32px; height: 32px; border-radius: 6px; cursor: pointer;
  border: 2px solid transparent; transition: 0.2s; flex-shrink: 0;
  border-color: var(--border-color);
}
#tool-body .color-swatch:hover, #tool-body .color-swatch.active { border-color: var(--primary); transform: scale(1.1); }
#tool-body .color-custom-wrap { display: flex; align-items: center; gap: 8px; margin-top: 10px; }
#tool-body .color-custom-wrap label { font-size: 13px; color: var(--text-sub); }

/* 渐变 */
#tool-body .gradient-list { display: flex; flex-wrap: wrap; gap: 10px; }
#tool-body .gradient-item {
  width: 64px; height: 40px; border-radius: 6px; cursor: pointer;
  border: 2px solid transparent; transition: 0.2s;
}
#tool-body .gradient-item:hover, #tool-body .gradient-item.active { border-color: var(--primary); transform: scale(1.05); }

/* 图片上传 */
#tool-body .img-upload-tip { font-size: 13px; color: var(--text-sub); margin-top: 8px; }
#tool-body .img-preview-wrap { margin-top: 10px; position: relative; display: inline-block; }
#tool-body .img-preview-wrap img { max-height: 100px; border-radius: 6px; border: 1px solid var(--border-color); }
#tool-body .img-remove { position: absolute; top: -8px; right: -8px; background: #ff5722; color: #fff; border-radius: 50%; width: 20px; height: 20px; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 12px; }

/* ===== 参数网格 ===== */
#tool-body .settings-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-top: 4px;
}
#tool-body .setting-item { display: flex; flex-direction: column; gap: 6px; }
#tool-body .setting-item label { font-size: 12px; color: var(--text-sub); font-weight: bold; }
#tool-body .setting-item select {
  padding: 8px 10px; border: 1px solid var(--border-color); border-radius: 6px;
  font-size: 13px; outline: none; background: var(--card-bg); color: inherit; cursor: pointer;
}
.theme-dark-mode #tool-body .setting-item select { border-color: #555; background: #333; color: #ddd; }
.theme-dark-mode #tool-body .setting-item select option { background: #333; }

/* ===== 高级设置折叠 ===== */
#tool-body .adv-toggle {
  cursor: pointer; font-size: 13px; color: var(--text-sub); padding: 5px 10px;
  border-radius: 4px; user-select: none; display: inline-flex; align-items: center; gap: 4px; margin-top: 12px;
}
#tool-body .adv-toggle:hover { background: var(--section-bg); color: var(--primary); }
#tool-body .adv-panel {
  background: var(--section-bg); border: 1px solid var(--border-color);
  border-radius: 6px; padding: 16px; margin-top: 10px;
}

/* ===== 操作区 ===== */
#tool-body .action-row {
  display: flex; align-items: center; gap: 14px; padding-top: 20px;
  border-top: 1px dashed var(--border-color); margin-top: 20px; flex-wrap: wrap;
}
#tool-body #convertBtn {
  flex: 1; background: var(--primary); border: none; transition: 0.3s;
}

/* ===== 进度区 ===== */
#tool-body .progress-area {
  margin-top: 20px; background: var(--section-bg); border-radius: 10px;
  padding: 20px; border: 1px solid var(--border-color); display: none;
}
#tool-body .progress-stage { font-size: 14px; font-weight: bold; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
#tool-body .progress-stage i { color: var(--primary); }
#tool-body .progress-bar-wrap { background: #e0e0e0; border-radius: 4px; height: 8px; overflow: hidden; }
.theme-dark-mode #tool-body .progress-bar-wrap { background: #444; }
#tool-body .progress-bar-fill { height: 100%; background: var(--primary); width: 0%; transition: width 0.3s; border-radius: 4px; }
#tool-body .progress-pct { font-size: 13px; color: var(--text-sub); margin-top: 6px; text-align: right; }
#tool-body .progress-log { font-size: 12px; color: var(--text-sub); margin-top: 8px; font-family: monospace;
  max-height: 200px;
  overflow: auto;
  white-space: break-spaces;
  text-overflow: ellipsis; 
}

/* ===== 输出区 ===== */
#tool-body .output-area { margin-top: 24px; display: none; }
#tool-body .output-card {
  border: 1px solid var(--border-color); border-radius: 10px; padding: 18px;
  background: var(--card-bg); display: flex; flex-direction: column; gap: 14px;
}
#tool-body .output-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
#tool-body .output-name { font-weight: bold; font-size: 14px; max-width: 300px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#tool-body .tag { padding: 2px 8px; border-radius: 4px; font-size: 12px; }
#tool-body .tag-fmt { background: #e3f9f5; color: #16baaa; border: 1px solid #c2e9e3; }
#tool-body .tag-size { background: var(--section-bg); color: var(--text-sub); border: 1px solid var(--border-color); }
.theme-dark-mode #tool-body .tag-fmt { background: #16baaa; color: #fff; border: 0; }
.theme-dark-mode #tool-body .tag-size { background: #444; color: #aaa; border: 0; }
#tool-body video { width: 100%; max-height: 300px; border-radius: 8px; background: #000; outline: none; }
#tool-body .output-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ===== section-title ===== */
#tool-body .section-title {
  font-weight: bold; font-size: 15px; margin: 22px 0 12px;
  display: flex; align-items: center; gap: 6px;
}
#tool-body .section-title i { color: var(--primary); }

@media (max-width: 768px) {
  #tool-body .upload-area { padding: 24px; }
  #tool-body video { max-height: 200px; }
}