:root {
  --bg-color: #1a1a1a;
  --panel-bg: #242424;
  --text-primary: #e0e0e0;
  --text-secondary: #aaaaaa;
  --accent-color: #3b82f6;
  --hover-bg: #2d2f36;
  --anchor-bg: rgba(59, 130, 246, 0.15);
  --anchor-border: #3b82f6;
  --border-color: #333333;
  --header-bg: #2b2b2b;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
}

.container {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

.panel {
  flex: 1 1 50%;
  display: flex;
  flex-direction: column;
  min-width: 0; 
  background-color: var(--panel-bg);
  position: relative;
  transition: flex-basis 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.panel.dragging {
  transition: none; 
}

/* Resizer Divider */
#resizer {
  width: 6px;
  background-color: var(--bg-color);
  cursor: col-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  user-select: none;
  transition: background-color 0.2s;
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
}

#resizer:hover, #resizer.active {
  background-color: var(--accent-color);
}

.resizer-grip {
  width: 4px;
  height: 36px;
  background-color: #555;
  border-radius: 4px;
  transition: background-color 0.2s;
}

#resizer:hover .resizer-grip {
  background-color: #fff;
}

/* Collapsed State */
.panel.collapsed {
  flex-basis: 48px !important;
  flex-grow: 0 !important;
  min-width: 48px !important;
  cursor: pointer;
  background-color: #1e1e1e;
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
}

.panel.collapsed .toolbar,
.panel.collapsed .content {
  display: none;
}

.panel.collapsed::after {
  content: '点击展开';
  writing-mode: vertical-rl;
  color: #888;
  padding-top: 24px;
  text-align: center;
  width: 100%;
  height: 100%;
  font-size: 14px;
  letter-spacing: 4px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s;
}

.panel.collapsed:hover::after {
  color: #fff;
}

/* Toolbar */
.toolbar {
  height: 56px;
  min-height: 56px;
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  box-sizing: border-box;
}

.toolbar-left, .toolbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.divider {
  width: 1px;
  height: 20px;
  background-color: #444;
  margin: 0 4px;
}

.btn {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid #444;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:hover {
  background-color: var(--hover-bg);
  border-color: #666;
}

.btn.active {
  background-color: rgba(59, 130, 246, 0.1);
  border-color: var(--accent-color);
  color: #60a5fa;
}

.view-mode-select {
  background: var(--bg-color);
  color: var(--text-primary);
  border: 1px solid #444;
  padding: 6px 10px;
  border-radius: 6px;
  outline: none;
  font-size: 13px;
  cursor: pointer;
}

.icon-btn {
  background: none;
  border: none;
  color: #aaa;
  cursor: pointer;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
}
.icon-btn:hover {
  background: #444;
  color: #fff;
}

.file-input { display: none; }

.content {
  flex: 1;
  overflow-y: auto;
  padding: 40px;
  line-height: 1.8;
  font-size: 15px;
  position: relative;
  scrollbar-width: thin;
  scrollbar-color: #555 #222;
}

.content::-webkit-scrollbar {
  width: 8px;
}
.content::-webkit-scrollbar-track {
  background: #222;
}
.content::-webkit-scrollbar-thumb {
  background-color: #555;
  border-radius: 4px;
}

.drop-zone {
  border: 2px dashed transparent;
  transition: all 0.2s;
}

.drop-zone.drag-over {
  border-color: var(--accent-color);
  background-color: rgba(59, 130, 246, 0.05);
}

.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-secondary);
  font-size: 1rem;
  pointer-events: none;
}

/* Markdown Blocks */
.md-block {
  padding: 12px 18px;
  margin-bottom: 16px;
  border-radius: 8px;
  border-left: 3px solid transparent;
  cursor: pointer;
  transition: background 0.15s, border 0.15s;
}

.md-block p {
  margin-bottom: 0.8em;
}
.md-block p:last-child {
  margin-bottom: 0;
}

.md-block:hover {
  background-color: var(--hover-bg);
}

.md-block.anchor {
  background-color: var(--anchor-bg);
  border-left-color: var(--anchor-border);
}

.md-block.pending-anchor {
  outline: 2px dashed rgba(59, 130, 246, 0.6);
  background-color: rgba(59, 130, 246, 0.05);
}

.bilingual-block .original {
  font-size: 0.9em;
  color: var(--text-secondary);
  margin-top: 8px;
  border-left: 2px solid var(--border-color);
  padding-left: 10px;
}

/* Loaders */
#loading-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  color: white;
  backdrop-filter: blur(4px);
}

.hidden {
  display: none !important;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(255,255,255,0.2);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 15px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Markdown basic formatting */
h1, h2, h3, h4 { margin-top: 1em; margin-bottom: 0.5em; color: white; }
code { background: #333; padding: 2px 5px; border-radius: 4px; font-family: monospace; }
pre { background: #222; padding: 15px; border-radius: 6px; overflow-x: auto; margin-bottom: 1em; }
pre code { background: none; padding: 0; }
blockquote { border-left: 4px solid #555; padding-left: 15px; color: #ccc; margin-left: 0; }
table { width: 100%; border-collapse: collapse; margin-bottom: 1em; }
th, td { border: 1px solid #444; padding: 8px; text-align: left; }
th { background: #333; }