const pptxgen = require("pptxgenjs");

let pres = new pptxgen();
pres.layout = 'LAYOUT_16x9';
pres.author = 'MD Anaesthesia';
pres.title = "Guedel's Stages of Anaesthesia";

// ── Color Palette ────────────────────────────────────────────
const C = {
  navy:     "0A1931",   // dominant dark background
  deepBlue: "102A5E",   // header bar
  teal:     "0E7C7B",   // accent / stage colors
  tealDark: "055A59",
  gold:     "F0A500",   // highlight accent
  goldLight:"FFC947",
  white:    "FFFFFF",
  offWhite: "E8EEF7",
  lightGray:"C5D0E6",
  stageColors: ["1565C0","0E7C7B","6A0DAD","B22222","C47700"],
  // Stage 1 blue, Stage 2 teal, Stage 3 purple, Stage 4 red, overall gold
};

// ── Helper: slide background ─────────────────────────────────
function darkBg(slide) {
  slide.addShape(pres.shapes.RECTANGLE, { x:0, y:0, w:10, h:5.625, fill:{color: C.navy} });
}

function headerBar(slide, title, subtitle) {
  // top bar
  slide.addShape(pres.shapes.RECTANGLE, { x:0, y:0, w:10, h:1.1, fill:{color: C.deepBlue} });
  slide.addShape(pres.shapes.RECTANGLE, { x:0, y:1.05, w:10, h:0.06, fill:{color: C.gold} });
  slide.addText(title, {
    x:0.3, y:0.1, w:9.4, h:0.7,
    fontSize:26, fontFace:"Calibri", bold:true, color:C.white, align:"left", margin:0
  });
  if (subtitle) {
    slide.addText(subtitle, {
      x:0.3, y:0.72, w:9.4, h:0.32,
      fontSize:12, fontFace:"Calibri", italic:true, color:C.goldLight, align:"left", margin:0
    });
  }
}

function footer(slide) {
  slide.addShape(pres.shapes.RECTANGLE, { x:0, y:5.3, w:10, h:0.325, fill:{color: C.deepBlue} });
  slide.addText("Guedel's Classification of Anaesthesia  |  MD Anaesthesia", {
    x:0.2, y:5.32, w:9.6, h:0.25,
    fontSize:8.5, fontFace:"Calibri", color:C.lightGray, align:"left", margin:0
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 1 – TITLE SLIDE
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  // Full dark bg
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:0, w:10, h:5.625, fill:{color: C.navy} });

  // Left accent bar
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:0, w:0.18, h:5.625, fill:{color: C.gold} });

  // Large decorative circle
  s.addShape(pres.shapes.OVAL, { x:5.8, y:-1.2, w:5.5, h:5.5, fill:{color:"102A5E"}, line:{color:"1A3A7A", width:1} });
  s.addShape(pres.shapes.OVAL, { x:6.2, y:-0.8, w:4.5, h:4.5, fill:{color:"0E2050"}, line:{color:"1A3A7A", width:0.5} });

  // Title
  s.addText("Guedel's Stages of", {
    x:0.5, y:1.0, w:8.5, h:0.9,
    fontSize:38, fontFace:"Calibri", bold:true, color:C.gold, align:"left", margin:0
  });
  s.addText("General Anaesthesia", {
    x:0.5, y:1.85, w:8.5, h:0.9,
    fontSize:38, fontFace:"Calibri", bold:true, color:C.white, align:"left", margin:0
  });

  // Divider line
  s.addShape(pres.shapes.RECTANGLE, { x:0.5, y:2.8, w:6, h:0.05, fill:{color: C.gold} });

  // Subtitle
  s.addText("Classical Classification of Ether Anaesthesia (1937)", {
    x:0.5, y:2.95, w:8.5, h:0.45,
    fontSize:15, fontFace:"Calibri", italic:true, color:C.offWhite, align:"left", margin:0
  });

  // Pills
  const pills = ["Stage I: Analgesia","Stage II: Excitement","Stage III: Surgical","Stage IV: Medullary Depression"];
  const pillColors = ["1565C0","0E7C7B","6A0DAD","B22222"];
  pills.forEach((p, i) => {
    s.addShape(pres.shapes.ROUNDED_RECTANGLE, {
      x:0.5 + i*2.35, y:3.65, w:2.2, h:0.45,
      fill:{color: pillColors[i]}, rectRadius:0.06
    });
    s.addText(p, {
      x:0.5 + i*2.35, y:3.65, w:2.2, h:0.45,
      fontSize:8.5, fontFace:"Calibri", bold:true, color:C.white, align:"center", margin:0, valign:"middle"
    });
  });

  // Presenter info
  s.addText("MD Anaesthesia  |  Department of Anaesthesiology", {
    x:0.5, y:4.9, w:9, h:0.3,
    fontSize:10, fontFace:"Calibri", color:C.lightGray, align:"left", margin:0
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 2 – HISTORICAL BACKGROUND
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  headerBar(s, "Historical Background", "Arthur Ernest Guedel (1883–1956)");
  footer(s);

  // Left column — biography card
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:0.3, y:1.3, w:3.2, h:3.75, fill:{color:"102A5E"}, rectRadius:0.1, shadow:{type:"outer",color:"000000",blur:8,offset:3,angle:135,opacity:0.3} });
  s.addShape(pres.shapes.RECTANGLE, { x:0.3, y:1.3, w:3.2, h:0.55, fill:{color: C.gold} });
  s.addText("Arthur E. Guedel", { x:0.35, y:1.32, w:3.1, h:0.5, fontSize:13, bold:true, color:C.navy, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });

  const bioItems = [
    "Born: January 13, 1883 (Indiana, USA)",
    "American anesthesiologist & pioneer",
    "Published classic stages in 1920 (field notes) and refined in 1937 textbook",
    "Based observations on open-drop diethyl ether anesthesia",
    "Also known for the Guedel oropharyngeal airway (1933)",
    "Died: February 18, 1956",
  ];
  bioItems.forEach((item, i) => {
    s.addShape(pres.shapes.RECTANGLE, { x:0.42, y:2.0 + i*0.47, w:0.06, h:0.22, fill:{color:C.gold} });
    s.addText(item, { x:0.55, y:1.98 + i*0.47, w:2.85, h:0.3, fontSize:9, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });

  // Right column — context
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:3.8, y:1.3, w:5.9, h:3.75, fill:{color:"0D2244"}, rectRadius:0.1 });

  const contextTitle = "Why Guedel's Classification Matters";
  s.addShape(pres.shapes.RECTANGLE, { x:3.8, y:1.3, w:5.9, h:0.55, fill:{color: C.teal} });
  s.addText(contextTitle, { x:3.85, y:1.32, w:5.8, h:0.5, fontSize:13, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });

  const contextItems = [
    ["Historical Context", "Developed during the ether era — single-agent, open-drop technique. Provided the first systematic description of CNS depression depth."],
    ["Clinical Utility", "Allowed anesthetists to monitor depth of anesthesia using observable physical signs without modern monitoring."],
    ["Modern Relevance", "Taught as foundational framework in anesthesia education; modern monitoring (BIS, entropy) evolved from these principles."],
    ["Limitation", "Developed for ether alone; modern balanced anesthesia uses IV agents + muscle relaxants, altering the classic signs."],
  ];
  contextItems.forEach(([title, desc], i) => {
    s.addText(title + ":", { x:4.0, y:2.05 + i*0.82, w:5.5, h:0.28, fontSize:10.5, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
    s.addText(desc, { x:4.0, y:2.3 + i*0.82, w:5.5, h:0.38, fontSize:9, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 3 – OVERVIEW TABLE of 4 Stages
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  headerBar(s, "Overview: Guedel's 4 Stages of Anaesthesia", "From consciousness to medullary paralysis");
  footer(s);

  const stages = [
    { num:"I",   name:"Analgesia",             color:"1565C0", sub:"Conscious & responsive",        breath:"Normal",       eyes:"Open, voluntary", reflexes:"Intact", other:"Pain ↓, amnesia begins" },
    { num:"II",  name:"Excitement",             color:"6A0DAD", sub:"Delirium & uninhibited",        breath:"Irregular",    eyes:"Open, involuntary", reflexes:"Exaggerated", other:"Vomiting, laryngospasm risk" },
    { num:"III", name:"Surgical Anaesthesia",   color:"0E7C7B", sub:"4 Planes — target for surgery", breath:"Regular→Paralysis", eyes:"Closed", reflexes:"Progressive loss", other:"4 planes within this stage" },
    { num:"IV",  name:"Medullary Depression",   color:"B22222", sub:"DANGER — impending death",      breath:"Paralysed",    eyes:"Fixed dilated", reflexes:"Absent", other:"Circulatory collapse, DEATH" },
  ];

  // Table header
  const headers = ["Stage", "Name", "Respiration", "Eye Signs", "Reflexes", "Key Features"];
  const colW    = [0.6,  2.1,  1.6,  1.7,  1.5,  2.3];
  let xPos = 0.18;
  headers.forEach((h, i) => {
    s.addShape(pres.shapes.RECTANGLE, { x:xPos, y:1.25, w:colW[i]-0.04, h:0.42, fill:{color: C.teal} });
    s.addText(h, { x:xPos, y:1.25, w:colW[i]-0.04, h:0.42, fontSize:9.5, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
    xPos += colW[i];
  });

  // Table rows
  stages.forEach((st, r) => {
    const rowBg = r % 2 === 0 ? "0D2244" : "081530";
    const cols = [st.num, st.name, st.breath, st.eyes, st.reflexes, st.other];
    let xp = 0.18;
    cols.forEach((cell, c) => {
      s.addShape(pres.shapes.RECTANGLE, { x:xp, y:1.72 + r*0.75, w:colW[c]-0.04, h:0.7, fill:{color: rowBg} });
      if (c === 0) {
        // Stage number with colored badge
        s.addShape(pres.shapes.OVAL, { x:xp+0.1, y:1.78 + r*0.75, w:0.4, h:0.4, fill:{color: st.color} });
        s.addText(st.num, { x:xp+0.1, y:1.78 + r*0.75, w:0.4, h:0.4, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
      } else if (c === 1) {
        s.addText(cell, { x:xp+0.06, y:1.74 + r*0.75, w:colW[c]-0.1, h:0.34, fontSize:9.5, bold:true, color:"FFD700", fontFace:"Calibri", margin:0, valign:"middle" });
        s.addText(st.sub, { x:xp+0.06, y:2.06 + r*0.75, w:colW[c]-0.1, h:0.32, fontSize:7.5, italic:true, color:C.lightGray, fontFace:"Calibri", margin:0 });
      } else {
        const textColor = (c === 5 && r === 3) ? "FF6B6B" : C.offWhite;
        s.addText(cell, { x:xp+0.06, y:1.74 + r*0.75, w:colW[c]-0.1, h:0.7, fontSize:8.5, color:textColor, fontFace:"Calibri", margin:0, valign:"middle" });
      }
      xp += colW[c];
    });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 4 – STAGE I: ANALGESIA
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  // Stage badge
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:0, w:10, h:1.1, fill:{color:"0D1E5A"} });
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:1.05, w:10, h:0.06, fill:{color:"1565C0"} });
  s.addShape(pres.shapes.OVAL, { x:0.2, y:0.1, w:0.82, h:0.82, fill:{color:"1565C0"} });
  s.addText("I", { x:0.2, y:0.1, w:0.82, h:0.82, fontSize:28, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
  s.addText("Stage I — Analgesia", { x:1.15, y:0.1, w:8, h:0.52, fontSize:26, bold:true, color:C.white, fontFace:"Calibri", align:"left", margin:0 });
  s.addText("Induction begins → Loss of consciousness", { x:1.15, y:0.62, w:8.5, h:0.4, fontSize:12, italic:true, color:"89B4FF", fontFace:"Calibri", align:"left", margin:0 });
  footer(s);

  // Two column layout
  // LEFT
  const leftData = [
    ["Also known as","Induction stage / Remi-anaesthesia stage"],
    ["Onset","From start of inhalation to loss of consciousness"],
    ["Consciousness","Present and fully cooperative"],
    ["Amnesia","Begins progressively (partial amnesia)"],
    ["Analgesia","Pain perception decreased; threshold raised"],
    ["Communication","Can respond to verbal commands"],
  ];
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:0.2, y:1.2, w:4.6, h:3.9, fill:{color:"0C1E4A"}, rectRadius:0.08 });
  s.addShape(pres.shapes.RECTANGLE, { x:0.2, y:1.2, w:4.6, h:0.42, fill:{color:"1565C0"} });
  s.addText("Characteristics", { x:0.25, y:1.22, w:4.5, h:0.38, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });
  leftData.forEach(([label, val], i) => {
    s.addText(label + ":", { x:0.35, y:1.72 + i*0.55, w:1.6, h:0.3, fontSize:9, bold:true, color:"89B4FF", fontFace:"Calibri", margin:0 });
    s.addText(val, { x:1.98, y:1.72 + i*0.55, w:2.7, h:0.42, fontSize:9, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });

  // RIGHT
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:5.1, y:1.2, w:4.7, h:1.78, fill:{color:"0C1E4A"}, rectRadius:0.08 });
  s.addShape(pres.shapes.RECTANGLE, { x:5.1, y:1.2, w:4.7, h:0.42, fill:{color:"1565C0"} });
  s.addText("Clinical Signs", { x:5.15, y:1.22, w:4.6, h:0.38, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });
  const signs = [
    "Respiration: Normal, regular",
    "Eyes: Open, normal movements",
    "Pupils: Normal size & reactive",
    "Muscle tone: Normal",
    "Reflexes: All intact",
  ];
  signs.forEach((sg, i) => {
    s.addShape(pres.shapes.RECTANGLE, { x:5.22, y:1.72 + i*0.28, w:0.07, h:0.18, fill:{color:"1565C0"} });
    s.addText(sg, { x:5.35, y:1.70 + i*0.28, w:4.3, h:0.27, fontSize:9, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });

  // Clinical notes box
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:5.1, y:3.1, w:4.7, h:2.0, fill:{color:"0E1E35"}, rectRadius:0.08, line:{color:"1565C0",width:1.5} });
  s.addText("Clinical Importance", { x:5.2, y:3.15, w:4.5, h:0.32, fontSize:10, bold:true, color:"89B4FF", fontFace:"Calibri", margin:0 });
  const notes = [
    "• Minor procedures can be performed (dental extractions, dressing changes)",
    "• Target for relative analgesia in dentistry (N₂O/O₂ 20–40% mixture)",
    "• Patient remains cooperative — important for positioning",
    "• Rapid eye opening on verbal command confirms Stage I",
  ];
  notes.forEach((n, i) => {
    s.addText(n, { x:5.2, y:3.5 + i*0.35, w:4.5, h:0.34, fontSize:8.5, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 5 – STAGE II: EXCITEMENT
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:0, w:10, h:1.1, fill:{color:"2D0A5A"} });
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:1.05, w:10, h:0.06, fill:{color:"6A0DAD"} });
  s.addShape(pres.shapes.OVAL, { x:0.2, y:0.1, w:0.82, h:0.82, fill:{color:"6A0DAD"} });
  s.addText("II", { x:0.2, y:0.1, w:0.82, h:0.82, fontSize:24, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
  s.addText("Stage II — Excitement / Delirium", { x:1.15, y:0.1, w:8, h:0.52, fontSize:26, bold:true, color:C.white, fontFace:"Calibri", align:"left", margin:0 });
  s.addText("Loss of consciousness → Regular respiration resumes", { x:1.15, y:0.62, w:8.5, h:0.4, fontSize:12, italic:true, color:"CC99FF", fontFace:"Calibri", align:"left", margin:0 });
  footer(s);

  // Warning banner
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:0.2, y:1.2, w:9.6, h:0.5, fill:{color:"4A0000"}, rectRadius:0.06, line:{color:"FF4444", width:1.5} });
  s.addText("⚠  DANGER ZONE — Pass through this stage as RAPIDLY as possible. DO NOT stimulate the patient!", {
    x:0.3, y:1.22, w:9.4, h:0.45, fontSize:10.5, bold:true, color:"FF8888", fontFace:"Calibri", align:"center", margin:0, valign:"middle"
  });

  // Two columns
  const leftData2 = [
    ["Consciousness","Lost — patient uncooperative"],
    ["Behaviour","Excited, delirious, combative"],
    ["Breathing","Irregular, breath-holding common"],
    ["Muscle tone","Increased (tense)"],
    ["Vomiting","High risk — silent regurgitation"],
    ["Eyes","Roving, nystagmus, lacrimation"],
    ["Pupils","Dilated, reactive"],
  ];
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:0.2, y:1.85, w:4.5, h:3.5, fill:{color:"1A0830"}, rectRadius:0.08 });
  s.addShape(pres.shapes.RECTANGLE, { x:0.2, y:1.85, w:4.5, h:0.42, fill:{color:"6A0DAD"} });
  s.addText("Signs & Symptoms", { x:0.25, y:1.87, w:4.4, h:0.38, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });
  leftData2.forEach(([label, val], i) => {
    s.addText(label + ":", { x:0.35, y:2.37 + i*0.43, w:1.5, h:0.3, fontSize:9, bold:true, color:"CC99FF", fontFace:"Calibri", margin:0 });
    s.addText(val, { x:1.9, y:2.37 + i*0.43, w:2.65, h:0.42, fontSize:9, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });

  // Right — complications and management
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:5.0, y:1.85, w:4.8, h:1.65, fill:{color:"1A0830"}, rectRadius:0.08 });
  s.addShape(pres.shapes.RECTANGLE, { x:5.0, y:1.85, w:4.8, h:0.42, fill:{color:"6A0DAD"} });
  s.addText("Complications", { x:5.05, y:1.87, w:4.7, h:0.38, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });
  const comps = ["Laryngospasm", "Bronchospasm", "Vomiting & Aspiration", "Breath-holding → Hypoxia", "Cardiac arrhythmias (vagal)"];
  comps.forEach((c, i) => {
    s.addShape(pres.shapes.OVAL, { x:5.12, y:2.34 + i*0.22, w:0.13, h:0.13, fill:{color:"FF4444"} });
    s.addText(c, { x:5.3, y:2.31 + i*0.22, w:4.4, h:0.22, fontSize:9, color:"FF8888", fontFace:"Calibri", margin:0 });
  });

  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:5.0, y:3.6, w:4.8, h:1.75, fill:{color:"1A0830"}, rectRadius:0.08 });
  s.addShape(pres.shapes.RECTANGLE, { x:5.0, y:3.6, w:4.8, h:0.42, fill:{color:"6A0DAD"} });
  s.addText("Management", { x:5.05, y:3.62, w:4.7, h:0.38, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });
  const mgmt = ["Rapid induction (IV agents preferred)", "Avoid surgical stimulation", "Maintain airway — head tilt/jaw thrust", "Avoid suctioning in Stage II", "Premed with opioids/midazolam to minimize"];
  mgmt.forEach((m, i) => {
    s.addShape(pres.shapes.RECTANGLE, { x:5.12, y:4.1 + i*0.22, w:0.07, h:0.15, fill:{color:"CC99FF"} });
    s.addText(m, { x:5.24, y:4.08 + i*0.22, w:4.5, h:0.22, fontSize:9, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 6 – STAGE III: OVERVIEW + PLANES TABLE
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:0, w:10, h:1.1, fill:{color:"073030"} });
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:1.05, w:10, h:0.06, fill:{color: C.teal} });
  s.addShape(pres.shapes.OVAL, { x:0.2, y:0.1, w:0.82, h:0.82, fill:{color: C.teal} });
  s.addText("III", { x:0.2, y:0.1, w:0.82, h:0.82, fontSize:22, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
  s.addText("Stage III — Surgical Anaesthesia (4 Planes)", { x:1.15, y:0.1, w:8.5, h:0.52, fontSize:24, bold:true, color:C.white, fontFace:"Calibri", align:"left", margin:0 });
  s.addText("Regular respiration → Cessation of intercostal movement", { x:1.15, y:0.62, w:8.5, h:0.4, fontSize:12, italic:true, color:"77DDCC", fontFace:"Calibri", align:"left", margin:0 });
  footer(s);

  // Planes table
  const planesData = [
    {
      plane:"Plane 1\n(Light)",
      resp:"Regular, thoracoabdominal",
      eyes:"Closed; eyeball movement present",
      pupil:"Normal, reactive",
      reflexes:"Conjunctival reflex ↓\nSwallowing reflex lost",
      muscle:"Normal",
      use:"Light procedures, positioning",
      color:"155E75"
    },
    {
      plane:"Plane 2\n(Medium)",
      resp:"Regular, thoracoabdominal",
      eyes:"Fixed centrally, loss of corneal reflex",
      pupil:"Slightly dilated",
      reflexes:"Corneal reflex lost\nLaryngeal reflex present",
      muscle:"Slight ↓",
      use:"Abdominal surface surgery",
      color:"0E7C7B"
    },
    {
      plane:"Plane 3\n(Deep)",
      resp:"Abdominal type, thoracic ↓",
      eyes:"Fixed, divergent",
      pupil:"Dilated, sluggish",
      reflexes:"Laryngeal reflex lost\nSphincter relax",
      muscle:"Moderate relaxation",
      use:"Intra-abdominal surgery",
      color:"0A5F60"
    },
    {
      plane:"Plane 4\n(Very Deep)",
      resp:"Diaphragmatic only",
      eyes:"Fixed, dilated",
      pupil:"Max dilated, non-reactive",
      reflexes:"All reflexes absent",
      muscle:"Complete flaccidity",
      use:"AVOID — approaches Stage IV",
      color:"B22222"
    },
  ];

  // Header row
  const ph = ["Plane","Respiration","Eye Signs","Pupil","Reflexes","Muscle Tone","Use"];
  const pw = [0.9,  1.5,  1.85, 1.1,  1.85, 1.25, 1.4];
  let xh = 0.15;
  ph.forEach((h, i) => {
    s.addShape(pres.shapes.RECTANGLE, { x:xh, y:1.2, w:pw[i]-0.04, h:0.38, fill:{color: C.teal} });
    s.addText(h, { x:xh, y:1.2, w:pw[i]-0.04, h:0.38, fontSize:8.5, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
    xh += pw[i];
  });

  planesData.forEach((pl, r) => {
    const rowCells = [pl.plane, pl.resp, pl.eyes, pl.pupil, pl.reflexes, pl.muscle, pl.use];
    let xp2 = 0.15;
    rowCells.forEach((cell, c) => {
      const rowH = 0.85;
      const rowBg = c === 6 && r === 3 ? "4A0000" : (r % 2 === 0 ? "0B2A2A" : "071C1C");
      s.addShape(pres.shapes.RECTANGLE, { x:xp2, y:1.62 + r*rowH, w:pw[c]-0.04, h:rowH-0.04, fill:{color: rowBg} });
      if (c === 0) {
        s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:xp2+0.05, y:1.66 + r*rowH, w:pw[c]-0.14, h:rowH-0.16, fill:{color: pl.color}, rectRadius:0.05 });
        s.addText(cell, { x:xp2+0.05, y:1.66 + r*rowH, w:pw[c]-0.14, h:rowH-0.16, fontSize:9, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
      } else {
        const tc = (c === 6 && r === 3) ? "FF8888" : (c === 6 ? "#9EFFDB" : C.offWhite);
        s.addText(cell, { x:xp2+0.05, y:1.64 + r*rowH, w:pw[c]-0.1, h:rowH-0.08, fontSize:8, color:tc, fontFace:"Calibri", margin:0, valign:"middle" });
      }
      xp2 += pw[c];
    });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 7 – STAGE III: Planes Deep Dive
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  headerBar(s, "Stage III — Planes: Key Signs in Detail", "Focus: Eye movements, Respiration, Reflexes");
  footer(s);

  // 4 plane cards in a row
  const cards = [
    { plane:"Plane 1", nick:"Light Surgical", color:"155E75",
      signs:["Eyeballs: Moving","Conjunctival reflex: Lost","Swallowing & vomiting\nreflex: Lost","Resp: Regular\nthoracoabdominal","Muscle tone: Normal"],
      tip:"Entry into surgical plane. Ideal for minor surgeries." },
    { plane:"Plane 2", nick:"Medium Surgical", color:"0E7C7B",
      signs:["Eyeballs: Fixed centrally","Corneal reflex: Lost","Loss of laryngeal\nspasm reflex","Resp: Regular\npredominantly thoracic","Muscle tone: Slight ↓"],
      tip:"Ideal for most general surgeries." },
    { plane:"Plane 3", nick:"Deep Surgical", color:"0A5F60",
      signs:["Eyeballs: Fixed, divergent","Pupil: Dilated, sluggish","Intercostal: Begins↓\n(abdominal breathing)","Resp: Abdominal only","Sphincter relaxation"],
      tip:"Required for intra-abdominal procedures; caution." },
    { plane:"Plane 4", nick:"Dangerously Deep", color:"8B0000",
      signs:["Pupils: Max dilated\nnon-reactive","All reflexes: Absent","Intercostal: Paralysed","Resp: Diaphragm only","Total muscle flaccidity"],
      tip:"⚠ Approaching Stage IV — immediately lighten!" },
  ];

  cards.forEach((card, i) => {
    const cx = 0.2 + i * 2.45;
    s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:cx, y:1.2, w:2.3, h:3.95, fill:{color:"0B2020"}, rectRadius:0.1, shadow:{type:"outer",color:"000000",blur:6,offset:2,angle:135,opacity:0.25} });
    s.addShape(pres.shapes.RECTANGLE, { x:cx, y:1.2, w:2.3, h:0.55, fill:{color: card.color} });
    s.addText(card.plane, { x:cx, y:1.22, w:2.3, h:0.3, fontSize:14, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0 });
    s.addText(card.nick, { x:cx, y:1.5, w:2.3, h:0.22, fontSize:8.5, italic:true, color:"AAFFEE", fontFace:"Calibri", align:"center", margin:0 });

    card.signs.forEach((sg, j) => {
      s.addShape(pres.shapes.RECTANGLE, { x:cx+0.1, y:1.85 + j*0.48, w:0.07, h:0.26, fill:{color: card.color} });
      s.addText(sg, { x:cx+0.22, y:1.83 + j*0.48, w:2.0, h:0.45, fontSize:8.2, color:C.offWhite, fontFace:"Calibri", margin:0 });
    });

    // Tip box
    s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:cx+0.06, y:4.52, w:2.18, h:0.5, fill:{color: card.color}, rectRadius:0.05 });
    s.addText(card.tip, { x:cx+0.08, y:4.53, w:2.14, h:0.48, fontSize:7.5, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 8 – STAGE IV: MEDULLARY DEPRESSION
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:0, w:10, h:1.1, fill:{color:"2A0000"} });
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:1.05, w:10, h:0.06, fill:{color:"B22222"} });
  s.addShape(pres.shapes.OVAL, { x:0.2, y:0.1, w:0.82, h:0.82, fill:{color:"B22222"} });
  s.addText("IV", { x:0.2, y:0.1, w:0.82, h:0.82, fontSize:22, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
  s.addText("Stage IV — Medullary Depression", { x:1.15, y:0.1, w:8, h:0.52, fontSize:24, bold:true, color:C.white, fontFace:"Calibri", align:"left", margin:0 });
  s.addText("Complete respiratory & cardiovascular collapse → Death", { x:1.15, y:0.62, w:8.5, h:0.4, fontSize:12, italic:true, color:"FF9999", fontFace:"Calibri", align:"left", margin:0 });
  footer(s);

  // Full-width danger strip
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:0.2, y:1.2, w:9.6, h:0.5, fill:{color:"5A0000"}, rectRadius:0.06, line:{color:"FF2222", width:2} });
  s.addText("☠  NOT A SURGICAL STAGE — Represents anaesthetic overdose / DEATH",
    { x:0.3, y:1.22, w:9.4, h:0.45, fontSize:11.5, bold:true, color:"FF6666", fontFace:"Calibri", align:"center", margin:0, valign:"middle" });

  // Three columns
  // Column 1 — Signs
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:0.2, y:1.85, w:3.0, h:3.5, fill:{color:"200000"}, rectRadius:0.08, line:{color:"B22222", width:1} });
  s.addShape(pres.shapes.RECTANGLE, { x:0.2, y:1.85, w:3.0, h:0.42, fill:{color:"B22222"} });
  s.addText("Clinical Signs", { x:0.25, y:1.87, w:2.9, h:0.38, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });
  const iv_signs = [
    "Respiration: Absent (apnoea)",
    "Eyes: Fixed, fully dilated",
    "Pupils: Maximally dilated,\nnon-reactive to light",
    "Reflexes: ALL absent",
    "Muscle tone: Complete flaccidity",
    "BP: Profoundly hypotensive",
    "Pulse: Weak & rapid → absent",
  ];
  iv_signs.forEach((sg, i) => {
    s.addShape(pres.shapes.OVAL, { x:0.32, y:2.36 + i*0.41, w:0.12, h:0.12, fill:{color:"FF4444"} });
    s.addText(sg, { x:0.48, y:2.33 + i*0.41, w:2.65, h:0.38, fontSize:9, color:"FF9999", fontFace:"Calibri", margin:0 });
  });

  // Column 2 — Mechanism
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:3.5, y:1.85, w:3.0, h:3.5, fill:{color:"200000"}, rectRadius:0.08, line:{color:"B22222", width:1} });
  s.addShape(pres.shapes.RECTANGLE, { x:3.5, y:1.85, w:3.0, h:0.42, fill:{color:"8B0000"} });
  s.addText("Mechanism", { x:3.55, y:1.87, w:2.9, h:0.38, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });
  const mechanism = [
    ["Medullary centres","Respiratory centre paralysed; vasomotor centre fails"],
    ["Cardiovascular","Loss of vasomotor tone → profound hypotension & CV collapse"],
    ["Brainstem","Complete shutdown of vital centres"],
    ["Outcome","Death within minutes if not reversed immediately"],
  ];
  mechanism.forEach(([t, desc], i) => {
    s.addText(t + ":", { x:3.6, y:2.36 + i*0.77, w:2.8, h:0.28, fontSize:9.5, bold:true, color:"FF8888", fontFace:"Calibri", margin:0 });
    s.addText(desc, { x:3.6, y:2.63 + i*0.77, w:2.8, h:0.42, fontSize:8.5, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });

  // Column 3 — Resuscitation
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:6.8, y:1.85, w:3.0, h:3.5, fill:{color:"200000"}, rectRadius:0.08, line:{color:"B22222", width:1} });
  s.addShape(pres.shapes.RECTANGLE, { x:6.8, y:1.85, w:3.0, h:0.42, fill:{color:"C47700"} });
  s.addText("Immediate Action", { x:6.85, y:1.87, w:2.9, h:0.38, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });
  const actions = [
    "STOP all anaesthetic agents immediately",
    "100% O₂ ventilation (mask/ETT)",
    "IPPV — initiate manual ventilation",
    "IV fluids & vasopressors (adrenaline)",
    "CPR if cardiac arrest occurs",
    "Reversal agents if applicable\n(Sugammadex, Flumazenil)",
    "Call for emergency help (Code Blue)",
  ];
  actions.forEach((a, i) => {
    s.addShape(pres.shapes.RECTANGLE, { x:6.9, y:2.36 + i*0.41, w:0.08, h:0.22, fill:{color:"FFA500"} });
    s.addText(a, { x:7.02, y:2.34 + i*0.41, w:2.65, h:0.38, fontSize:8.5, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 9 – PROGRESSIVE DEPTH DIAGRAM
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  headerBar(s, "Progressive Depth of Anaesthesia", "Continuous spectrum from consciousness to medullary depression");
  footer(s);

  // Draw a continuous horizontal depth bar
  const barY = 2.0;
  const barH = 0.65;
  const segments = [
    { label:"Stage I\nAnalgesia",          w:1.8, color:"1565C0" },
    { label:"Stage II\nExcitement",         w:1.6, color:"6A0DAD" },
    { label:"Stage III P1\nLight",          w:1.2, color:"155E75" },
    { label:"Stage III P2\nMedium",         w:1.2, color:"0E7C7B" },
    { label:"Stage III P3\nDeep",           w:1.2, color:"0A5F60" },
    { label:"Stage III P4\nVery Deep",      w:1.1, color:"8B0000" },
    { label:"Stage IV\nMedullary",          w:1.7, color:"B22222" },
  ];
  let sx = 0.0;
  segments.forEach((seg, i) => {
    s.addShape(pres.shapes.RECTANGLE, { x:sx, y:barY, w:seg.w, h:barH, fill:{color: seg.color} });
    s.addText(seg.label, { x:sx+0.03, y:barY, w:seg.w-0.06, h:barH, fontSize:7.5, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
    sx += seg.w;
  });

  // Arrow beneath bar
  s.addShape(pres.shapes.RECTANGLE, { x:0.1, y:2.75, w:9.2, h:0.1, fill:{color:C.gold} });
  s.addShape(pres.shapes.RECTANGLE, { x:9.15, y:2.68, w:0.2, h:0.24, fill:{color:C.gold} });
  s.addText("← Conscious", { x:0.1, y:2.86, w:2, h:0.28, fontSize:9, color:C.gold, fontFace:"Calibri", margin:0 });
  s.addText("DEPTH OF ANAESTHESIA INCREASES →", { x:3.5, y:2.86, w:4, h:0.28, fontSize:9, bold:true, color:C.gold, fontFace:"Calibri", align:"center", margin:0 });
  s.addText("Death →", { x:8.2, y:2.86, w:1.5, h:0.28, fontSize:9, color:"FF4444", fontFace:"Calibri", margin:0 });

  // Pupil changes row
  s.addText("Pupil Changes:", { x:0.15, y:3.25, w:2, h:0.3, fontSize:10, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
  const pupilStates = ["Normal","Dilated\n(reactive)","Normal\n(reactive)","Slightly\ndilated","Dilated\nsluggish","Max dilated\nnon-reactive","Max dilated\nnon-reactive"];
  let px = 0;
  segments.forEach((seg, i) => {
    s.addText(pupilStates[i], { x:px+0.05, y:3.22, w:seg.w-0.1, h:0.55, fontSize:7, color:C.lightGray, fontFace:"Calibri", align:"center", margin:0 });
    px += seg.w;
  });

  // Surgical utility row
  s.addText("Surgical Use:", { x:0.15, y:3.85, w:2, h:0.3, fontSize:10, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
  const surgUse = ["Minor / relative\nanaesthesia","AVOID\nstimulation","Minor surgery","General surgery","Intra-abdominal","Avoid — lighten\nimmediately","STOP —\nresuscitate"];
  const useColors = ["1565C0","6A0DAD","155E75","0E7C7B","0A5F60","8B4513","B22222"];
  let ux = 0;
  segments.forEach((seg, i) => {
    s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:ux+0.04, y:3.82, w:seg.w-0.08, h:0.62, fill:{color: useColors[i]}, rectRadius:0.04 });
    s.addText(surgUse[i], { x:ux+0.06, y:3.83, w:seg.w-0.12, h:0.6, fontSize:7, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
    ux += seg.w;
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 10 – SIGNS AT EACH STAGE (MNEMONICS / QUICK REFERENCE)
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  headerBar(s, "Quick Reference: Signs at Each Stage", "Respiratory, Ocular, Cardiovascular & Reflex Changes");
  footer(s);

  const signRows = [
    { param:"Consciousness",  s1:"Present", s2:"Lost", s3p1:"Lost", s3p2:"Lost", s3p3:"Lost", s3p4:"Lost", s4:"Lost" },
    { param:"Respiration",    s1:"Regular, thoracoabdominal", s2:"Irregular", s3p1:"Regular, thoracoabdominal", s3p2:"Regular, thoracoabdominal", s3p3:"Abdominal (thoracic ↓)", s3p4:"Diaphragmatic only", s4:"Absent (apnoea)" },
    { param:"Eye movement",   s1:"Present (voluntary)", s2:"Involuntary (roving)", s3p1:"Present (involuntary)", s3p2:"Fixed centrally", s3p3:"Fixed, divergent", s3p4:"Fixed", s4:"Fixed" },
    { param:"Pupils",         s1:"Normal", s2:"Dilated, reactive", s3p1:"Normal, reactive", s3p2:"Slightly dilated", s3p3:"Dilated, sluggish", s3p4:"Max dilated, NR", s4:"Max dilated, NR" },
    { param:"Corneal reflex", s1:"Present", s2:"Exaggerated", s3p1:"Present", s3p2:"LOST", s3p3:"Absent", s3p4:"Absent", s4:"Absent" },
    { param:"Laryngeal reflex",s1:"Present", s2:"Exaggerated", s3p1:"Present", s3p2:"Present", s3p3:"LOST", s3p4:"Absent", s4:"Absent" },
    { param:"Muscle tone",    s1:"Normal", s2:"Increased", s3p1:"Normal", s3p2:"Slight ↓", s3p3:"Moderate ↓", s3p4:"Flaccid", s4:"Complete flaccidity" },
    { param:"BP / Pulse",     s1:"Normal", s2:"↑ (excitation)", s3p1:"Normal", s3p2:"Normal", s3p3:"Slight ↓", s3p4:"↓↓", s4:"Collapse" },
  ];

  const headers2 = ["Parameter","Stage I","Stage II","III-P1","III-P2","III-P3","III-P4","Stage IV"];
  const cw2 = [1.55, 1.18, 1.15, 1.05, 1.05, 1.15, 1.15, 1.42];
  const hColors = ["0A3050","1565C0","6A0DAD","155E75","0E7C7B","0A5F60","8B0000","B22222"];
  let hx = 0.1;
  headers2.forEach((h, i) => {
    s.addShape(pres.shapes.RECTANGLE, { x:hx, y:1.22, w:cw2[i]-0.04, h:0.38, fill:{color: hColors[i]} });
    s.addText(h, { x:hx, y:1.22, w:cw2[i]-0.04, h:0.38, fontSize:8.5, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
    hx += cw2[i];
  });

  signRows.forEach((row, r) => {
    const cells = [row.param, row.s1, row.s2, row.s3p1, row.s3p2, row.s3p3, row.s3p4, row.s4];
    let rx = 0.1;
    cells.forEach((cell, c) => {
      const rowBg = r % 2 === 0 ? "0C1F30" : "081525";
      s.addShape(pres.shapes.RECTANGLE, { x:rx, y:1.64 + r*0.48, w:cw2[c]-0.04, h:0.46, fill:{color: rowBg} });
      const isLost = cell === "LOST" || cell === "Absent" || cell === "Absent (apnoea)" || cell === "Collapse";
      const textColor = c === 0 ? C.gold : (isLost ? "FF7777" : C.offWhite);
      s.addText(cell, { x:rx+0.04, y:1.65 + r*0.48, w:cw2[c]-0.1, h:0.44, fontSize:7.5, bold:(c===0), color:textColor, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
      rx += cw2[c];
    });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 11 – COMPARISON: ETHER ERA vs MODERN ANAESTHESIA
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  headerBar(s, "Classical vs Modern Anaesthesia", "Limitations of Guedel's Classification in Contemporary Practice");
  footer(s);

  // Two large cards
  // Left — Classical Ether
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:0.2, y:1.25, w:4.6, h:3.9, fill:{color:"0A1E10"}, rectRadius:0.1 });
  s.addShape(pres.shapes.RECTANGLE, { x:0.2, y:1.25, w:4.6, h:0.5, fill:{color:"1B5E20"} });
  s.addText("Classical Ether Anaesthesia", { x:0.25, y:1.27, w:4.5, h:0.46, fontSize:13, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });

  const etherPoints = [
    ["Single agent","Diethyl ether — slow induction/recovery; predictable depth"],
    ["Slow progression","Clear, gradual transition between stages (easily observable)"],
    ["Muscle relaxation","Achieved through depth alone (Stage III P3)"],
    ["Signs reliable","Eye signs, pupil changes, breathing patterns all intact"],
    ["Monitoring","Clinical signs were the ONLY monitoring available"],
    ["Usage today","No longer used clinically; historical interest only"],
  ];
  etherPoints.forEach(([t, d], i) => {
    s.addShape(pres.shapes.OVAL, { x:0.35, y:1.88 + i*0.52, w:0.14, h:0.14, fill:{color:"4CAF50"} });
    s.addText(t + ":", { x:0.54, y:1.86 + i*0.52, w:1.4, h:0.26, fontSize:9, bold:true, color:"88FF88", fontFace:"Calibri", margin:0 });
    s.addText(d, { x:0.54, y:2.1 + i*0.52, w:4.1, h:0.28, fontSize:8.5, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });

  // Right — Modern
  s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:5.1, y:1.25, w:4.7, h:3.9, fill:{color:"0A1025"}, rectRadius:0.1 });
  s.addShape(pres.shapes.RECTANGLE, { x:5.1, y:1.25, w:4.7, h:0.5, fill:{color:"0E7C7B"} });
  s.addText("Modern Balanced Anaesthesia", { x:5.15, y:1.27, w:4.6, h:0.46, fontSize:13, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });

  const modernPoints = [
    ["Multiple agents","IV induction (propofol) + volatile + opioids + NMBA"],
    ["Rapid induction","Jumps Stage II rapidly with IV agents"],
    ["NMB drugs","Muscle relaxation independent of anaesthetic depth"],
    ["Signs unreliable","Paralysis masks motor signs; autonomic changes predominate"],
    ["Monitoring","BIS, Entropy, NMT monitoring, hemodynamic monitoring"],
    ["Guedel's role","Still taught as conceptual framework; not directly applied"],
  ];
  modernPoints.forEach(([t, d], i) => {
    s.addShape(pres.shapes.OVAL, { x:5.22, y:1.88 + i*0.52, w:0.14, h:0.14, fill:{color:"0E7C7B"} });
    s.addText(t + ":", { x:5.4, y:1.86 + i*0.52, w:1.4, h:0.26, fontSize:9, bold:true, color:"77DDCC", fontFace:"Calibri", margin:0 });
    s.addText(d, { x:5.4, y:2.1 + i*0.52, w:4.25, h:0.28, fontSize:8.5, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 12 – CLINICAL PEARLS & MCQ POINTS
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  headerBar(s, "Clinical Pearls & Exam Points", "High-yield facts for MD Anaesthesia");
  footer(s);

  const pearls = [
    { cat:"Exam Favourite", color:"F0A500", items:[
      "Corneal reflex is LOST at start of Plane 2 of Stage III",
      "Laryngeal reflex is LOST at start of Plane 3 of Stage III",
      "Stage III Plane 3 = ideal plane for intra-abdominal surgery (ether era)",
      "Swallowing & vomiting reflex: lost at beginning of Stage III",
    ]},
    { cat:"Stage II Pearls", color:"6A0DAD", items:[
      "Most dangerous stage — avoid any stimulation",
      "Irregular breathing, coughing, vomiting, laryngospasm occur",
      "Premedication (opioids, midazolam, anticholinergics) minimises Stage II",
      "IV induction (propofol, thiopental) shortens Stage II exposure",
    ]},
    { cat:"Pupil Changes", color:"0E7C7B", items:[
      "Stage I: Normal",
      "Stage II: Dilated, reactive",
      "Stage III P1: Normal reactive → P2: Slightly dilated → P3: Dilated sluggish → P4: Max dilated NR",
      "Stage IV: Maximally dilated, non-reactive (mydriasis = overdose sign)",
    ]},
    { cat:"Respiratory Pattern", color:"1565C0", items:[
      "Stage I–III P2: Regular thoracoabdominal breathing",
      "Stage III P3: Predominantly abdominal (intercostal paralysis begins)",
      "Stage III P4: Diaphragmatic breathing only",
      "Stage IV: Apnoea → death without intervention",
    ]},
  ];

  const colPositions = [0.15, 5.05];
  pearls.forEach((pearl, i) => {
    const col = i % 2;
    const row = Math.floor(i / 2);
    const cx = colPositions[col];
    const cy = 1.22 + row * 2.1;
    s.addShape(pres.shapes.ROUNDED_RECTANGLE, { x:cx, y:cy, w:4.75, h:2.0, fill:{color:"0C1A30"}, rectRadius:0.08 });
    s.addShape(pres.shapes.RECTANGLE, { x:cx, y:cy, w:4.75, h:0.42, fill:{color: pearl.color} });
    s.addText(pearl.cat, { x:cx+0.05, y:cy+0.02, w:4.65, h:0.38, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0, valign:"middle" });
    pearl.items.forEach((item, j) => {
      s.addShape(pres.shapes.RECTANGLE, { x:cx+0.12, y:cy+0.5 + j*0.37, w:0.07, h:0.22, fill:{color: pearl.color} });
      s.addText(item, { x:cx+0.24, y:cy+0.48 + j*0.37, w:4.4, h:0.35, fontSize:8.5, color:C.offWhite, fontFace:"Calibri", margin:0 });
    });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 13 – THANK YOU / SUMMARY
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:0, w:10, h:5.625, fill:{color: C.navy} });
  s.addShape(pres.shapes.RECTANGLE, { x:0, y:0, w:0.18, h:5.625, fill:{color: C.gold} });
  s.addShape(pres.shapes.OVAL, { x:5.5, y:0.5, w:5, h:5, fill:{color:"0D2244"}, line:{color:"1A3A7A", width:1} });

  s.addText("Summary", { x:0.4, y:0.6, w:5, h:0.6, fontSize:32, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
  s.addShape(pres.shapes.RECTANGLE, { x:0.4, y:1.25, w:4.5, h:0.05, fill:{color: C.gold} });

  const summaryPoints = [
    "Guedel (1937) described 4 stages based on ether anaesthesia",
    "Stage I: Analgesia — conscious, cooperative",
    "Stage II: Excitement — AVOID stimulation",
    "Stage III: Surgical (4 planes) — target zone",
    "Stage IV: Medullary depression — EMERGENCY",
    "Modern anaesthesia bypasses Stage II with IV induction",
    "Conceptual foundation for all depth-of-anaesthesia monitoring",
  ];
  summaryPoints.forEach((pt, i) => {
    s.addShape(pres.shapes.OVAL, { x:0.42, y:1.42 + i*0.48, w:0.14, h:0.14, fill:{color: C.gold} });
    s.addText(pt, { x:0.62, y:1.39 + i*0.48, w:4.7, h:0.45, fontSize:10, color:C.offWhite, fontFace:"Calibri", margin:0 });
  });

  // Thank you
  s.addText("Thank You", { x:5.7, y:1.8, w:3.5, h:0.8, fontSize:36, bold:true, color:C.white, fontFace:"Calibri", align:"center", margin:0 });
  s.addShape(pres.shapes.RECTANGLE, { x:6.2, y:2.65, w:2.5, h:0.05, fill:{color: C.gold} });
  s.addText("MD Anaesthesia\nDepartment of Anaesthesiology", { x:5.7, y:2.75, w:3.5, h:0.8, fontSize:13, color:C.lightGray, fontFace:"Calibri", align:"center", margin:0, italic:true });

  // Reference
  s.addText("Reference: Guedel AE. Inhalation Anesthesia: A Fundamental Guide. New York: Macmillan; 1937.", {
    x:0.4, y:5.25, w:9.2, h:0.3, fontSize:7.5, italic:true, color:C.lightGray, fontFace:"Calibri", margin:0
  });
}

// ── Write file ───────────────────────────────────────────────
pres.writeFile({ fileName: "/home/daytona/workspace/guedel-anaesthesia-ppt/Guedel_Stages_of_Anaesthesia.pptx" })
  .then(() => console.log("DONE: Guedel_Stages_of_Anaesthesia.pptx created"))
  .catch(err => console.error("ERROR:", err));