:root {
  --bg-color: #1e1e1e;
  --tab-bg: #2d2d2d;
  --active-tab-bg: #1e1e1e;
  --border-color: #252526;
  --text-color: #d4d4d4;
  --breadcrumb-color: #a6a6a6;
  --tag-color: #569cd6;
  --attr-color: #9cdcfe;
  --string-color: #ce9178;
  --num-color: #858585;
  --bracket-color: #808080;
  --keyword-color: #569cd6;
  --comment-color: #6A9955;
  --hover-color: #4ec9b0;
  --accent-color: #007acc;
  --term-bg: #181818;
}

body.light-theme {
  --bg-color: #ffffff;
  --tab-bg: #f3f3f3;
  --active-tab-bg: #ffffff;
  --border-color: #ececec;
  --text-color: #333333;
  --breadcrumb-color: #616161;
  --tag-color: #800000;
  --attr-color: #ff0000;
  --string-color: #0451a5;
  --num-color: #2b91af;
  --bracket-color: #808080;
  --keyword-color: #0000ff;
  --comment-color: #008000;
  --hover-color: #008000;
  --accent-color: #007acc;
  --term-bg: #f8f8f8;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: 'Consolas', 'Courier New', 'Roboto Mono', monospace;
  font-size: 15px;
  font-weight: 500;
  height: 100vh;
  width: 100vw;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header & Tabs */
.tabs-container {
  display: flex;
  justify-content: space-between;
  background-color: var(--tab-bg);
  height: 35px;
  width: 100%;
  border-bottom: 1px solid var(--border-color);
}

.tabs-left { display: flex; }

.tab {
  display: flex;
  align-items: center;
  background-color: var(--active-tab-bg);
  color: var(--text-color);
  padding: 0 15px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 13px;
  border-top: 2px solid var(--accent-color);
  border-right: 1px solid var(--border-color);
  gap: 6px;
  user-select: none;
}

.tab-icon { color: #e34c26; font-weight: bold; font-family: 'Consolas', monospace; }

.header-actions {
  display: flex;
  align-items: center;
  padding-right: 15px;
  gap: 15px;
}

.action-btn {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
  opacity: 0.8;
  transition: opacity 0.2s, color 0.2s;
}

.action-btn:hover { opacity: 1; color: var(--hover-color); }

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  height: 25px;
  background-color: var(--bg-color);
  padding: 0 15px;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 12px;
  color: var(--breadcrumb-color);
  border-bottom: 1px solid var(--border-color);
}

.bc-item { display: inline-flex; align-items: center; gap: 4px; }
.chevron { margin: 0 4px; opacity: 0.7; font-size: 10px; }

/* Editor Body */
.editor-content {
  flex: 1;
  padding: 10px 0;
  overflow-y: auto;
  overflow-x: hidden;
}

.line {
  display: flex;
  align-items: flex-start;
  padding-right: 15px;
  line-height: 1.6;
}

/* Gutter (Numbers + Fold Icons) */
.gutter {
  flex: 0 0 3.5rem;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding-right: 20px;
  position: relative;
  user-select: none;
}

.num { color: var(--num-color); font-weight: 400; }

.fold-icon {
  position: absolute;
  right: 4px;
  font-size: 9px;
  color: var(--num-color);
  cursor: pointer;
  opacity: 0.4;
  transition: transform 0.2s, opacity 0.2s;
}

.line:hover .fold-icon { opacity: 1; }
.fold-icon.collapsed { transform: rotate(-90deg); opacity: 1; }

.code-content {
  flex: 1;
  white-space: pre-wrap;
  word-break: break-word;
}

/* IntelliSense (Tooltips) */
.intellisense {
  position: relative;
  text-decoration: underline;
  text-decoration-style: dashed;
  text-decoration-color: var(--comment-color);
  cursor: help;
}

.intellisense::after {
  content: attr(data-info);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(5px);
  background-color: var(--tab-bg);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 13px;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  white-space: pre;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.intellisense:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-5px);
}

/* Syntax Highlighting */
.tag { color: var(--tag-color); }
.attr { color: var(--attr-color); }
.str { color: var(--string-color); }
.br { color: var(--bracket-color); }
.keyword { color: var(--keyword-color); }
.comment { color: var(--comment-color); }

.url-link { color: var(--string-color); text-decoration: none; transition: color 0.2s; }
.url-link:hover { text-decoration: underline; color: var(--hover-color); }

/* Interactive boolean toggle */
.interactive-bool {
  cursor: pointer;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 4px;
  transition: color 0.2s ease;
}
.interactive-bool:hover { color: var(--hover-color); }

/* Integrated Terminal */
.terminal-panel {
  height: 0;
  background-color: var(--term-bg);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: height 0.3s ease;
  overflow: hidden;
}

.terminal-panel.open { height: 200px; }

.terminal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5px 15px;
  font-family: -apple-system, sans-serif;
  font-size: 11px;
  text-transform: uppercase;
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
}

.term-close { cursor: pointer; opacity: 0.6; }
.term-close:hover { opacity: 1; }

.terminal-body {
  padding: 10px 15px;
  overflow-y: auto;
  font-size: 13px;
  flex: 1;
}

.term-line {
  margin-bottom: 4px;
  opacity: 0;
  transform: translateY(5px);
  animation: fadeUp 0.3s forwards;
}

.term-success { color: var(--comment-color); }
.term-warning { color: #d7ba7d; }
.term-path { color: var(--tag-color); }

.term-link {
  color: var(--attr-color);
  text-decoration: none;
}

.term-link:hover {
  text-decoration: underline;
}

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
  body { font-size: 14px; }
  .gutter { flex: 0 0 3rem; padding-right: 18px; }
  .fold-icon { display: block; opacity: 0.8; }
}