/* ============================================================
   LEARN VBA — Dark Theme Stylesheet
   ============================================================ */

:root {
  --bg: #1e1e1e;
  --bg2: #252526;
  --bg3: #2d2d2d;
  --bg4: #333333;
  --border: #3c3c3c;
  --text: #d4d4d4;
  --text-dim: #858585;
  --text-bright: #ffffff;
  --accent: #007acc;
  --accent-hover: #1a8bd0;
  --accent2: #569cd6;
  --green: #4ec9b0;
  --green2: #6a9955;
  --yellow: #dcdcaa;
  --orange: #ce9178;
  --red: #f44747;
  --purple: #c586c0;
  --keyword: #569cd6;
  --string-color: #ce9178;
  --number-color: #b5cea8;
  --comment-color: #6a9955;
  --topbar-h: 52px;
  --sidebar-w: 260px;
  --editor-h: 340px;
  --output-h: 260px;
  --radius: 6px;
  --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

body {
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  font-size: 14px;
}

/* ====== TOP BAR ====== */
#topbar {
  height: var(--topbar-h);
  background: #0e0e0e;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 24px;
  z-index: 100;
  position: relative;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.logo-icon { font-size: 20px; }
.logo-text {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-bright);
  letter-spacing: -0.3px;
}

.progress-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 500px;
}
.progress-bar-track {
  flex: 1;
  height: 6px;
  background: var(--bg3);
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--green));
  border-radius: 3px;
  transition: width 0.5s ease;
  width: 0%;
}
.progress-label {
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
  flex-shrink: 0;
}

.topbar-right { margin-left: auto; }
.badge {
  background: linear-gradient(135deg, #f39c12, #e74c3c);
  color: white;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 12px;
}

/* ====== LAYOUT ====== */
#layout {
  display: flex;
  height: calc(100vh - var(--topbar-h));
  overflow: hidden;
}

/* ====== SIDEBAR ====== */
#sidebar {
  width: var(--sidebar-w);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  flex-shrink: 0;
}

#sidebar::-webkit-scrollbar { width: 6px; }
#sidebar::-webkit-scrollbar-track { background: transparent; }
#sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

#sidebar-inner { padding-bottom: 24px; }

.sidebar-header {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 16px 16px 8px;
}

.module-group { margin-bottom: 4px; }

.module-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.3px;
  text-transform: uppercase;
  user-select: none;
  transition: color 0.15s;
}
.module-label:hover { color: var(--text); }
.module-label .chevron { transition: transform 0.2s; font-size: 10px; }
.module-label.open .chevron { transform: rotate(90deg); }
.module-number {
  background: var(--bg4);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 10px;
  color: var(--accent2);
}

.lesson-list { display: none; }
.module-group.open .lesson-list { display: block; }

.lesson-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 32px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-dim);
  border-left: 2px solid transparent;
  transition: all 0.15s;
  line-height: 1.3;
}
.lesson-item:hover {
  color: var(--text);
  background: var(--bg3);
}
.lesson-item.active {
  color: var(--accent2);
  background: rgba(0, 122, 204, 0.1);
  border-left-color: var(--accent);
}
.lesson-item.completed { color: var(--green); }
.lesson-item.completed::before {
  content: '✓';
  font-size: 11px;
  margin-right: -4px;
}

/* ====== MAIN CONTENT ====== */
#content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

#main-split {
  flex: 1;
  display: flex;
  flex-direction: row;
  min-height: 0;
  overflow: hidden;
}

/* Resize handles */
.split-handle {
  background: var(--border);
  flex-shrink: 0;
  transition: background 0.15s;
  z-index: 5;
}
.split-handle:hover, .split-handle.dragging { background: var(--accent); }
.split-handle-h { width: 4px; cursor: col-resize; }
.split-handle-v { height: 4px; cursor: row-resize; }

/* ====== LESSON PANE ====== */
#lesson-pane {
  flex: 0 0 48%;
  min-width: 320px;
  overflow-y: auto;
  padding: 20px 28px 24px;
  background: var(--bg);
}

#lesson-pane::-webkit-scrollbar { width: 6px; }
#lesson-pane::-webkit-scrollbar-track { background: transparent; }
#lesson-pane::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.lesson-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.module-badge {
  background: var(--accent);
  color: white;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
}
.lesson-num {
  font-size: 12px;
  color: var(--text-dim);
}

#lessonTitle {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 14px;
  letter-spacing: -0.3px;
}

#lessonBody {
  line-height: 1.7;
  color: var(--text);
}
#lessonBody p { margin-bottom: 12px; }
#lessonBody h2 {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent2);
  margin: 20px 0 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}
#lessonBody h3 {
  font-size: 13px;
  font-weight: 700;
  color: var(--yellow);
  margin: 16px 0 6px;
}
#lessonBody ul, #lessonBody ol {
  margin: 8px 0 12px 20px;
}
#lessonBody li { margin-bottom: 4px; }
#lessonBody code {
  font-family: var(--font-mono);
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 5px;
  font-size: 12.5px;
  color: var(--green);
}
#lessonBody pre {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin: 12px 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
}
#lessonBody pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
}
#lessonBody .tip {
  background: rgba(0, 122, 204, 0.1);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 10px 14px;
  margin: 12px 0;
  font-size: 13px;
}
#lessonBody .warning {
  background: rgba(206, 145, 120, 0.1);
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 10px 14px;
  margin: 12px 0;
  font-size: 13px;
}
#lessonBody .exercise {
  background: rgba(78, 201, 176, 0.08);
  border: 1px solid rgba(78, 201, 176, 0.3);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin: 16px 0;
}
#lessonBody .exercise::before {
  content: '🎯 Exercise';
  display: block;
  font-weight: 700;
  color: var(--green);
  margin-bottom: 8px;
  font-size: 13px;
}
#lessonBody strong { color: var(--text-bright); }
#lessonBody em { color: var(--yellow); font-style: normal; }

/* Syntax highlighting in lesson body pre blocks */
.kw { color: var(--keyword); font-weight: 600; }
.str { color: var(--string-color); }
.num { color: var(--number-color); }
.cmt { color: var(--comment-color); font-style: italic; }
.fn { color: var(--yellow); }
.type { color: var(--green); }

/* ====== WORKSPACE ====== */
#workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--bg);
  border-left: 1px solid var(--border);
}

/* Editor Pane (top half) */
#editor-pane {
  flex: 0 0 55%;
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
}

#monacoEditor {
  flex: 1;
  min-height: 0;
}

/* Output Pane (bottom half) */
#output-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
}

/* Pane Headers */
.pane-header {
  display: flex;
  align-items: center;
  padding: 0 12px;
  height: 38px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  gap: 8px;
  flex-shrink: 0;
}
.pane-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 5px;
}
.pane-actions { margin-left: auto; display: flex; gap: 6px; }

.pane-header button {
  background: var(--bg4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  font-size: 12px;
  padding: 4px 10px;
  transition: all 0.15s;
  font-family: var(--font-ui);
}
.pane-header button:hover { background: var(--bg3); border-color: #555; }

#runBtn {
  background: var(--accent) !important;
  border-color: var(--accent) !important;
  color: white !important;
  font-weight: 600;
}
#runBtn:hover { background: var(--accent-hover) !important; }
#runBtn:active { transform: scale(0.97); }

/* Tabs */
.tabs { display: flex; gap: 2px; }
.tab {
  background: transparent !important;
  border: none !important;
  border-radius: 0 !important;
  color: var(--text-dim) !important;
  padding: 4px 10px !important;
  font-size: 12px !important;
  display: flex;
  align-items: center;
  gap: 4px;
  border-bottom: 2px solid transparent !important;
  transition: all 0.15s !important;
}
.tab:hover { color: var(--text) !important; background: transparent !important; }
.tab.active {
  color: var(--accent2) !important;
  border-bottom-color: var(--accent) !important;
}

/* Tab panels */
.tab-panel {
  display: none;
  flex: 1;
  overflow-y: auto;
  min-height: 0;
}
.tab-panel.active { display: flex; flex-direction: column; }

.tab-panel::-webkit-scrollbar { width: 5px; }
.tab-panel::-webkit-scrollbar-track { background: transparent; }
.tab-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* Console Output */
#consoleOutput {
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 12px;
  flex-direction: column;
  gap: 2px;
}

.console-line {
  line-height: 1.5;
  padding: 1px 0;
  display: flex;
  gap: 8px;
  align-items: flex-start;
}
.console-line .prefix {
  color: var(--text-dim);
  flex-shrink: 0;
  font-size: 11px;
  padding-top: 1px;
}
.console-line .value { color: var(--text); word-break: break-all; }
.console-line.error .value { color: var(--red); }
.console-line.success .value { color: var(--green); }
.console-line.info .value { color: var(--accent2); }
.console-empty {
  color: var(--text-dim);
  font-size: 12px;
  padding: 20px;
  text-align: center;
  font-family: var(--font-ui);
  font-style: italic;
}

/* Spreadsheet */
#spreadsheetOutput { padding: 12px; }
#spreadsheetGrid {
  overflow: auto;
  border-radius: var(--radius);
}

.sheet-table {
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12px;
  min-width: 100%;
}
.sheet-table th {
  background: var(--bg3);
  border: 1px solid var(--border);
  padding: 4px 8px;
  text-align: center;
  color: var(--text-dim);
  font-weight: 600;
  min-width: 80px;
  position: sticky;
  top: 0;
}
.sheet-table th:first-child {
  width: 40px;
  min-width: 40px;
  position: sticky;
  left: 0;
  z-index: 2;
}
.sheet-table td {
  border: 1px solid var(--border);
  padding: 3px 8px;
  min-width: 80px;
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  background: var(--bg);
}
.sheet-table td:first-child {
  background: var(--bg3);
  text-align: center;
  color: var(--text-dim);
  font-size: 11px;
  position: sticky;
  left: 0;
}
.sheet-table td.modified {
  background: rgba(0, 122, 204, 0.12);
  color: var(--text-bright);
}
.sheet-table td.bold { font-weight: bold; }
.sheet-table td.italic { font-style: italic; }

/* ====== LESSON NAV ====== */
#lesson-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

#lesson-nav button {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  padding: 7px 16px;
  transition: all 0.15s;
  font-family: var(--font-ui);
  font-weight: 500;
}
#lesson-nav button:hover:not(:disabled) {
  background: var(--bg4);
  border-color: #555;
}
#lesson-nav button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
#nextBtn {
  background: var(--accent) !important;
  border-color: var(--accent) !important;
  color: white !important;
}
#nextBtn:hover:not(:disabled) { background: var(--accent-hover) !important; }

#lesson-dots { display: flex; gap: 5px; }
.lesson-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  transition: all 0.2s;
  cursor: pointer;
}
.lesson-dot.active { background: var(--accent); transform: scale(1.2); }
.lesson-dot.done { background: var(--green); }

/* ====== TOAST ====== */
#toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 18px;
  font-size: 13px;
  color: var(--text-bright);
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.3s;
  pointer-events: none;
  z-index: 9999;
  max-width: 300px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
#toast.show { opacity: 1; transform: translateY(0); }
#toast.success { border-left: 3px solid var(--green); }
#toast.error { border-left: 3px solid var(--red); }
#toast.info { border-left: 3px solid var(--accent); }

/* ====== SCROLLBARS ====== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #555; }

/* ====== ANIMATIONS ====== */
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
#lessonBody { animation: fadeIn 0.25s ease; }

/* ====== RESPONSIVE LAYOUT ====== */
@media (max-width: 1100px) {
  #lesson-pane { flex-basis: 42%; }
}
@media (max-width: 900px) {
  #main-split { flex-direction: column; }
  #lesson-pane { flex: 0 0 38%; min-width: 0; border-bottom: 1px solid var(--border); }
  #workspace { border-left: none; }
  .split-handle-h { display: none; }
  #sidebar { width: 220px; }
}