body {
  margin: 0;
  font-family: sans-serif;
  background: var(--bg);
  color: var(--text);
}

:root {
  --bg: #ffffff;
  --text: #222;
  --panel-bg: #f3f3f3;
  --header-bg: #222;
  --header-text: #fff;
  --border: #ccc;
  --example-btn-bg: #f6f8fa;
  --example-btn-border: #c8d1dc;
  --example-btn-text: #24292f;
  --example-btn-hover-bg: #e9eef2;
  --example-btn-hover-border: #bbc4cf;
}

[data-theme="dark"] {
  --bg: #1f1f1f;
  --text: #fff;
  --panel-bg: #2b2b2b;
  --border: #444;
}

.header {
  padding: 1rem;
  background: var(--header-bg);
  color: var(--header-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.controls button {
  margin-left: 0.5rem;
}

.pane, .pane * {
  box-sizing: border-box;
}

.layout {
  display: flex;
  width: 100vw;
  max-width: calc(100vw - 15px);
  height: calc(100vh - 120px);
  overflow: visible;
}

.pane {
  flex: 0 1 50%;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--panel-bg);
}

.pane.right,
#lessonContent {
  max-width: 100%;
  overflow-x: hidden;
}

.pane.right,
#lessonsOutput {
  max-width: 100%;
  overflow-x: hidden;
}

textarea {
  flex: 1;
  padding: 1rem;
  resize: none;
  border: none;
  background: var(--bg);
  color: var(--text);
}

.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.tab {
  padding: 0.5rem 1rem;
  background: transparent;
  color: var(--text);
  border: none;
  cursor: pointer;
}

.tab.active {
  border-bottom: 3px solid dodgerblue;
  font-weight: bold;
}

.tab-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.tab-pane {
  display: none;
  padding: 1rem;
}

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

#statusBar {
  padding: 0.5rem;
  background: var(--panel-bg);
  border-top: 1px solid var(--border);
  text-align: center;
}

.editor-wrapper {
  position: relative;
  flex: 1;
  overflow: hidden;         /* <-- REQUIRED to stop overflow */
  width: 100%;              /* <-- ensure no horizontal resize */
}


#yamlInput {
  position: relative;
  width: 100%;
  height: 100%;
  background: transparent;
  z-index: 2;
  font-family: monospace;
  line-height: 1.4em;
}

#lineHighlight {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  overflow: hidden;
  height: 1.5em;
  margin: 0;
  padding: 8px;
  background: rgba(30, 144, 255, 0.2);
  font-family: monospace;
  font-size: 15px;
  line-height: 1.5em;
  pointer-events: none;
  z-index: 1;
}

.pane.left {
  min-width: 0;
  overflow: hidden;
}

#yamlInput,
#lineHighlight {
  box-sizing: border-box;   /* <-- EXACT FIT inside wrapper */
  width: 100%;              /* <-- do not expand horizontally */
}

#lineHighlight {
  left: 0;
  right: 0;
  overflow: hidden;         /* EXTRA safety */
}

.hover-tooltip {
  position: absolute;
  z-index: 9999;
  background: var(--panel-bg);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 10px;
  font-family: monospace;
  font-size: 13px;
  border-radius: 4px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.25);
  display: none; /* hidden by default */
  max-width: 300px;
  pointer-events: none; /* so mouse stays on textarea */
}

#doctorOutput {
  padding: 10px;
  white-space: pre-wrap;
  font-family: monospace;
}

#monacoContainer {
  flex: 1;
  width: 100%;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  border: 1px solid #333;
  border-radius: 6px;
}

.monaco-editor .monaco-hover {
  top: 10px !important;
  max-height: calc(100vh - 20px) !important;
}

/* Highlight full line background */
.monaco-line-highlight {
  background-color: rgba(255, 255, 0, 0.12) !important;
}

/* Highlight gutter on the left */
.monaco-line-highlight-gutter {
  background-color: rgba(255, 255, 0, 0.35) !important;
}

.ref-valid-underline {
  text-decoration: underline;
  text-decoration-color: #4CAF50 !important; /* green */
  text-decoration-thickness: 1px;
}

.ref-error-underline {
  text-decoration: underline;
  text-decoration-color: #FF3B30 !important; /* red */
  text-decoration-thickness: 1px;
}

.ref-target-highlight {
  background-color: rgba(0, 255, 0, 0.22) !important;
}

.ref-underline {
  text-decoration: underline dotted #30a0ff !important;
}

.ref-underline-error {
  text-decoration: underline wavy #ff3b3b !important;
}

/* Teaching Mode ON button highlight */
#toggleTeachingBtn.teaching-on {
  background-color: #0b7;
  border-color: #095;
  color: black;
  font-weight: bold;
}

#doctorBtn, 
#toggleLessonsBtn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background 0.2s ease, transform 0.15s ease;
}


.teaching-highlight {
  background-color: rgba(40, 200, 120, 0.15);
}

.glyph-teaching {
  background: url('data:image/svg+xml;utf8,<svg ...></svg>') center no-repeat;
}

/* Teaching Mode Highlights */
.teaching-highlight {
  background-color: rgba(40, 200, 120, 0.15); /* soft green */
}

.glyph-teaching {
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' fill='lightgreen'><circle cx='7' cy='7' r='6'/></svg>") 
    center no-repeat;
}

.teaching-marker {
  background: url("data:image/svg+xml;utf8,<svg ...>") no-repeat center center;
}

/* ------------------------------
   LESSONS PANEL
------------------------------- */

#lessonContent {
  padding: 1rem;
  overflow-y: auto;
  line-height: 1.55;
  font-size: 1rem;
}

#lessonContent,
#tipsOutput {
  max-width: 100%;
  width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
}

#lessonContent h1,
#lessonContent h2,
#lessonContent h3 {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

#lessonContent h1 {
  font-size: 1.8rem;
}

#lessonContent h2 {
  font-size: 1.4rem;
}

#lessonContent h3 {
  font-size: 1.2rem;
}

/* Markdown code blocks */
#lessonContent pre {
  background: transparent !important;
  color: var(--code-fg, #747373);
  padding: 0.75rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.9rem;
  margin: 1rem 0;
}

/* Lessons → code block dark theme */
#lessonContent pre code {
  background: #1e1e1e !important;
  color: #dddddd !important;
  display: block;
  padding: 12px 14px;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.45;
}

/* Markdown lists */
#lessonContent ul {
  margin-left: 1.2rem;
  padding-left: 0.8rem;
}

#lessonContent li {
  margin-bottom: 0.4rem;
}


/* Lesson navigation */
.lesson-nav {
  margin-top: 2rem;
  display: flex;
  justify-content: space-between;
}

.lesson-nav button {
  padding: 0.5rem 1rem;
  background: #007acc;
  border: none;
  color: white;
  font-weight: bold;
  border-radius: 4px;
  cursor: pointer;
}

.lesson-nav button:hover {
  background: #005fa3;
}

/* Shared button design */
.open-example-btn {
  margin-top: 8px;
  padding: 6px 14px;
  font-size: 0.9rem;
  background: var(--example-btn-bg);
  border: 1px solid var(--example-btn-border);
  color: var(--example-btn-text);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s, border 0.2s;
}

/* Hover effect */
.open-example-btn:hover {
  background: var(--example-btn-hover-bg);
  border-color: var(--example-btn-hover-border);
}

/* Dark mode variables */
[data-theme="dark"] {
  --example-btn-bg: #1f242b;
  --example-btn-border: #3a414b;
  --example-btn-text: #e6e6e6;
  --example-btn-hover-bg: #2a3139;
  --example-btn-hover-border: #4d5561;
}

/* ----------------------------------------------------
   DRAGGABLE SPLIT PANE BAR  (Non-conflicting patch)
----------------------------------------------------- */

/* The draggable divider */
#dragbar {
  width: 6px;
  cursor: col-resize;
  background: var(--border); /* neutral line based on your theme */
  flex-shrink: 0;            /* prevent it collapsing */
  transition: background 0.15s ease;
}

#dragbar:hover {
  background: #999; /* a little highlight for UX */
}

/* Ensure left pane is allowed to shrink nicely */
#leftPane {
  flex-basis: 50%;   /* initial size */
  min-width: 200px;  /* prevents collapsing fully */
  overflow: hidden;  /* avoid horizontal scrollbars */
}

/* Ensure right pane respects minimum */
#rightPane {
  min-width: 0;
  flex-grow: 1;
  min-width: 300px;
  overflow-x: hidden;
  overflow-y: auto;
}

#lessonContent {
  max-width: 100%;
}

#lessonContent pre {
  max-width: 100%;
}


/* FORCE ALL CODE/PRE BLOCKS TO WRAP INSTEAD OF SCROLL */
#lessonContent pre,
#lessonContent code,
#tipsOutput pre,
#tipsOutput code {
  white-space: pre-wrap !important;   /* wrap lines */
  word-wrap: break-word !important;   /* break long words */
  overflow-x: hidden !important;      /* no scroll */
  max-width: 100% !important;         /* never expand pane */
  box-sizing: border-box;
}

.lesson-view {
  display: flex;
  flex-direction: row;
  height: 100%;
  overflow: hidden;
}

.lesson-toc {
  width: 240px;
  border-right: 1px solid var(--border);
  padding: 1rem;
  overflow-y: auto;
  background: var(--bg);
}

.lesson-content {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
}

.lesson-toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.lesson-toc li {
  padding: 0.4rem 0.2rem;
  cursor: pointer;
  border-radius: 6px;
  color: var(--text);
}

.lesson-toc li:hover {
  background: var(--hover, rgba(0,0,0,0.1));
}

[data-theme="dark"] .lesson-toc li:hover {
  background: rgba(255,255,255,0.1);
}

.lesson-toc li.active {
  background: var(--accent-bg, #28a74533);
  color: var(--accent-text, var(--text));
  font-weight: 600;
  border-left: 4px solid var(--accent, #28a745);
  padding-left: 0.5rem;
}

.lesson-toc {
  position: sticky;
  top: 0;
  height: 100%;
}

/* =========================================================
   🟩 Footer styling
   ========================================================= */

.tutor-footer {
  text-align: center;
  padding: 0.75rem 0.5rem 1rem;
  font-size: 0.8rem;
  opacity: 0.6;
}

.tutor-footer-hint a {
  text-decoration: none;
  font-weight: 500;
}

.tutor-footer-hint a:hover {
  text-decoration: underline;
}