const pptxgen = require("pptxgenjs");
const { execSync } = require("child_process");

// ─── Image URLs ───────────────────────────────────────────────────────────────
const IMG_URLS = [
  // Slide 2 – Upper respiratory tract overview
  "https://cdn.orris.care/cdss_images/pmc_clinical_VQA_f4056d8fd2c71be609d60fe2316facaa1a7ad4567c2f4e843f9354bdc7509359.jpg",
  // Slide 3 – Larynx anatomy
  "https://cdn.orris.care/cdss_images/pmc_clinical_VQA_032dd5edc6d7800e225c57f64777356b9123696a20be0eedea11b8d7982559b8.jpg",
  // Slide 4 – Trachea CT 3D
  "https://cdn.orris.care/cdss_images/pmc_clinical_VQA_c7b531355f895798e106229c9ea6823981c9332a4488b8e6ebbc1b0637c8cbed.jpg",
  // Slide 5 – Bronchial tree diagram
  "https://cdn.orris.care/cdss_images/BAILY_1760544972668_fbd8fc44-bbb4-485a-ad29-d6ed5ee936a5.png",
  // Slide 6 – Lung lobes diagram
  "https://cdn.orris.care/cdss_images/pmc_clinical_VQA_83f94abe7980c4edfa395a28cdb09eabcd5a05aa7ece758dd4bdb45681802911.jpg",
  // Slide 7 – Gross lung specimen
  "https://cdn.orris.care/cdss_images/pmc_clinical_VQA_b80156f9ca5f8f9a3364e2c6b393a31a572584dd3ae07bda6ece5d09277c0bec.jpg",
  // Slide 8 – CT fissures
  "https://cdn.orris.care/cdss_images/pmc_clinical_VQA_d134cdd016f694520bf4194aa8a6624776396876556cb4e36ee271a12c525f09.jpg",
  // Slide 9 – 3D CT tracheobronchial
  "https://cdn.orris.care/cdss_images/pmc_clinical_VQA_fa42ad9b16c0be21ae8ef8d9dc96afaf6c918153a909122f82a03ff3fbc68792.jpg",
];

// Download all images as base64
console.log("Downloading images...");
const rawImages = JSON.parse(
  execSync(
    `node /home/daytona/skills/shared/scripts/fetch_images.js ${IMG_URLS.map(u => `"${u}"`).join(" ")}`
  ).toString()
);

// Build a helper map url -> base64
const imgMap = {};
rawImages.forEach(r => { if (!r.error) imgMap[r.url] = r.base64; });

// ─── Palette ──────────────────────────────────────────────────────────────────
const BG_DARK   = "0D2B45";   // deep navy – dominant
const BG_MID    = "10395A";   // medium navy
const ACCENT1   = "3AC9D6";   // cyan accent
const ACCENT2   = "56CCF2";   // sky blue
const WHITE     = "FFFFFF";
const LIGHT_TXT = "C8E6F4";
const DIVIDER   = "1D5078";

const pres = new pptxgen();
pres.layout = "LAYOUT_16x9";
pres.title  = "Topographic Anatomy of the Respiratory System";
pres.author = "Medical Education";

// ─── Helper Functions ─────────────────────────────────────────────────────────

function addBackground(slide, color = BG_DARK) {
  slide.addShape(pres.ShapeType.rect, {
    x: 0, y: 0, w: 10, h: 5.625,
    fill: { color },
    line: { color, width: 0 }
  });
}

function addSlideNumber(slide, num) {
  slide.addText(`${num} / 9`, {
    x: 9.1, y: 5.3, w: 0.8, h: 0.25,
    fontSize: 8, color: ACCENT1, align: "right"
  });
}

function addSectionBar(slide, title, sub = "") {
  // Teal left bar
  slide.addShape(pres.ShapeType.rect, {
    x: 0, y: 0, w: 0.18, h: 5.625,
    fill: { color: ACCENT1 }, line: { color: ACCENT1, width: 0 }
  });
  // Top header band
  slide.addShape(pres.ShapeType.rect, {
    x: 0, y: 0, w: 10, h: 0.72,
    fill: { color: BG_MID }, line: { color: BG_MID, width: 0 }
  });
  slide.addText(title, {
    x: 0.3, y: 0.0, w: 8.5, h: 0.72,
    fontSize: 22, bold: true, color: ACCENT1, valign: "middle", margin: 0
  });
  if (sub) {
    slide.addText(sub, {
      x: 0.3, y: 0.72, w: 9.5, h: 0.32,
      fontSize: 10, color: LIGHT_TXT, italic: true, margin: 0
    });
  }
}

function addBullets(slide, items, opts = {}) {
  const { x = 0.3, y = 1.1, w = 4.5, h = 4.1, fontSize = 12 } = opts;
  const richText = items.map((item, i) => {
    const isLast = i === items.length - 1;
    if (typeof item === "string") {
      return { text: item, options: { bullet: true, color: LIGHT_TXT, fontSize, breakLine: !isLast } };
    }
    // object with { header, text }
    const parts = [
      { text: item.header + ": ", options: { bold: true, color: ACCENT2, fontSize, bullet: true } },
      { text: item.text, options: { color: LIGHT_TXT, fontSize, breakLine: !isLast } }
    ];
    return parts;
  }).flat();
  slide.addText(richText, { x, y, w, h, valign: "top" });
}

// ═══════════════════════════════════════════════════════════════════════════════
//  SLIDE 1 – Title
// ═══════════════════════════════════════════════════════════════════════════════
{
  const slide = pres.addSlide();
  addBackground(slide, BG_DARK);

  // Decorative large circle
  slide.addShape(pres.ShapeType.ellipse, {
    x: 6.5, y: -1.5, w: 5.5, h: 5.5,
    fill: { color: BG_MID }, line: { color: DIVIDER, width: 1 }
  });
  slide.addShape(pres.ShapeType.ellipse, {
    x: 7.2, y: -0.8, w: 4.2, h: 4.2,
    fill: { color: "0B233A" }, line: { color: ACCENT1, width: 1.5 }
  });

  // Teal accent bar (left)
  slide.addShape(pres.ShapeType.rect, {
    x: 0, y: 1.9, w: 0.25, h: 1.8,
    fill: { color: ACCENT1 }, line: { color: ACCENT1, width: 0 }
  });

  // Title
  slide.addText("TOPOGRAPHIC ANATOMY", {
    x: 0.4, y: 1.7, w: 6.5, h: 0.85,
    fontSize: 30, bold: true, color: WHITE, charSpacing: 2, margin: 0
  });
  slide.addText("OF THE RESPIRATORY SYSTEM", {
    x: 0.4, y: 2.5, w: 6.5, h: 0.7,
    fontSize: 22, bold: true, color: ACCENT1, charSpacing: 1, margin: 0
  });

  // Subtitle
  slide.addText("A comprehensive overview of upper and lower airways,\nlung morphology, pleura, and thoracic topography", {
    x: 0.4, y: 3.3, w: 6.2, h: 0.8,
    fontSize: 11, color: LIGHT_TXT, italic: true
  });

  // Bottom tags
  ["Upper Airways", "Trachea", "Bronchi", "Lungs", "Pleura", "Mediastinum"].forEach((tag, i) => {
    slide.addShape(pres.ShapeType.roundRect, {
      x: 0.4 + i * 1.6, y: 4.9, w: 1.5, h: 0.35,
      fill: { color: DIVIDER }, line: { color: ACCENT1, width: 0.75 },
      rectRadius: 0.05
    });
    slide.addText(tag, {
      x: 0.4 + i * 1.6, y: 4.9, w: 1.5, h: 0.35,
      fontSize: 8, color: ACCENT1, align: "center", valign: "middle"
    });
  });

  addSlideNumber(slide, 1);
}

// ═══════════════════════════════════════════════════════════════════════════════
//  SLIDE 2 – Upper Respiratory Tract Overview
// ═══════════════════════════════════════════════════════════════════════════════
{
  const slide = pres.addSlide();
  addBackground(slide);
  addSectionBar(slide, "Upper Respiratory Tract", "Nasal cavity → Pharynx → Larynx");

  const img = imgMap[IMG_URLS[0]];
  if (img) {
    slide.addImage({ data: img, x: 5.7, y: 0.8, w: 4.1, h: 4.6 });
  }

  addBullets(slide, [
    { header: "Nasal Cavity", text: "Extends from nares to choanae; lined by pseudostratified ciliated epithelium; turbinates increase surface area for air conditioning." },
    { header: "Paranasal Sinuses", text: "Maxillary, frontal, ethmoid, and sphenoid sinuses drain into nasal meatus; lined by respiratory mucosa." },
    { header: "Nasopharynx", text: "Posterior to nasal cavity; contains pharyngeal tonsil (adenoid) and openings of Eustachian tubes." },
    { header: "Oropharynx", text: "Between soft palate and epiglottis; bounded laterally by palatine tonsils." },
    { header: "Hypopharynx", text: "From epiglottis to cricoid; communicates with both larynx anteriorly and esophagus posteriorly." },
    { header: "Blood Supply", text: "Sphenopalatine a., anterior & posterior ethmoidal aa.; anterior nasal floor by greater palatine a." }
  ], { x: 0.3, y: 1.1, w: 5.2, h: 4.2, fontSize: 11 });

  addSlideNumber(slide, 2);
}

// ═══════════════════════════════════════════════════════════════════════════════
//  SLIDE 3 – Larynx
// ═══════════════════════════════════════════════════════════════════════════════
{
  const slide = pres.addSlide();
  addBackground(slide);
  addSectionBar(slide, "The Larynx", "C3–C6 Vertebral Level");

  const img = imgMap[IMG_URLS[1]];
  if (img) {
    slide.addImage({ data: img, x: 5.5, y: 0.85, w: 4.3, h: 4.5 });
  }

  addBullets(slide, [
    { header: "Location", text: "Anterior neck, C3–C6; continuous with laryngopharynx above and trachea below." },
    { header: "Cartilages", text: "Thyroid (largest), cricoid (only complete ring), epiglottis (elastic), arytenoid (×2), corniculate & cuneiform (×2 each)." },
    { header: "Vocal Folds", text: "True cords: vocalis muscle + vocal ligament. Rima glottidis is narrowest part of adult airway." },
    { header: "Intrinsic Muscles", text: "Cricothyroid (tensor); posterior crico-arytenoid (only abductor); lateral crico-arytenoid (adductor); transverse arytenoid." },
    { header: "Innervation", text: "Recurrent laryngeal nerve (all intrinsic muscles except cricothyroid). External branch of superior laryngeal n. → cricothyroid." },
    { header: "Clinical", text: "Laryngoscopic view: epiglottis, aryepiglottic folds, false/true cords. Subglottic space prone to edema in croup." }
  ], { x: 0.3, y: 1.1, w: 5.0, h: 4.2, fontSize: 11 });

  addSlideNumber(slide, 3);
}

// ═══════════════════════════════════════════════════════════════════════════════
//  SLIDE 4 – Trachea
// ═══════════════════════════════════════════════════════════════════════════════
{
  const slide = pres.addSlide();
  addBackground(slide);
  addSectionBar(slide, "The Trachea", "From cricoid (C6) to carina (T4–T5)");

  const img = imgMap[IMG_URLS[2]];
  if (img) {
    slide.addImage({ data: img, x: 5.6, y: 0.85, w: 4.2, h: 4.5 });
  }

  addBullets(slide, [
    { header: "Dimensions", text: "~10–11 cm long, ~2 cm diameter in adults; 16–20 C-shaped hyaline cartilage rings open posteriorly." },
    { header: "Posterior Wall", text: "Trachealis muscle (smooth) spans posterior gap; allows esophageal distension during swallowing." },
    { header: "Carina", text: "Bifurcation at T4–T5; right main bronchus more vertical (25°), making right the more common site for inhaled foreign bodies." },
    { header: "Relations", text: "Anterior: thyroid, thymus, great vessels. Posterior: esophagus. Lateral: carotid sheaths, lobes of thyroid." },
    { header: "Blood Supply", text: "Superior & inferior thyroid arteries; tracheal branches of bronchial arteries supply carina region." },
    { header: "Histology", text: "Pseudostratified ciliated columnar epithelium (respiratory epithelium) with goblet cells; submucosal seromucous glands." }
  ], { x: 0.3, y: 1.1, w: 5.1, h: 4.2, fontSize: 11 });

  addSlideNumber(slide, 4);
}

// ═══════════════════════════════════════════════════════════════════════════════
//  SLIDE 5 – Bronchial Tree
// ═══════════════════════════════════════════════════════════════════════════════
{
  const slide = pres.addSlide();
  addBackground(slide);
  addSectionBar(slide, "The Bronchial Tree", "Primary → Lobar → Segmental → Terminal");

  const img = imgMap[IMG_URLS[3]];
  if (img) {
    slide.addImage({ data: img, x: 5.5, y: 0.85, w: 4.3, h: 4.5 });
  }

  addBullets(slide, [
    { header: "Primary Bronchi", text: "Right (shorter, wider, ~25° from midline) and left (longer, narrower, ~45° from midline) main bronchi." },
    { header: "Lobar Bronchi", text: "Right: 3 lobar bronchi (upper, middle, lower). Left: 2 lobar bronchi (upper, lower). Upper = eparterial on right." },
    { header: "Segmental Bronchi", text: "10 segments on right; 8–10 on left. Each segment is an independent surgical unit with its own bronchus + artery." },
    { header: "Terminal Bronchioles", text: "No cartilage; smooth muscle only; ~16 generations from trachea; each supplies 1 acinus (alveolar unit)." },
    { header: "Respiratory Bronchioles", text: "Transitional zone; generations 17–19; have scattered alveoli; site of gas exchange begins here." },
    { header: "Lymphatics", text: "Drain toward bronchopulmonary (hilar) nodes → tracheobronchial nodes → paratracheal nodes → thoracic duct." }
  ], { x: 0.3, y: 1.1, w: 5.0, h: 4.2, fontSize: 11 });

  addSlideNumber(slide, 5);
}

// ═══════════════════════════════════════════════════════════════════════════════
//  SLIDE 6 – Lung Morphology & Lobes
// ═══════════════════════════════════════════════════════════════════════════════
{
  const slide = pres.addSlide();
  addBackground(slide);
  addSectionBar(slide, "Lung Morphology & Lobar Anatomy", "Surface markings and fissures");

  const img = imgMap[IMG_URLS[4]];
  if (img) {
    slide.addImage({ data: img, x: 5.5, y: 0.85, w: 4.3, h: 4.5 });
  }

  addBullets(slide, [
    { header: "Right Lung", text: "3 lobes (upper, middle, lower); 2 fissures: oblique (major) + horizontal (minor). Weight ~620 g. Shorter and wider than left." },
    { header: "Left Lung", text: "2 lobes (upper, lower) + lingula; 1 oblique fissure. Cardiac notch medially. Weight ~567 g." },
    { header: "Oblique Fissure", text: "Runs from T2–T3 posteriorly to 6th rib anteriorly (both lungs); separates upper from lower lobe." },
    { header: "Horizontal Fissure", text: "Right lung only; passes from oblique fissure at mid-axillary line to sternum at 4th costal cartilage." },
    { header: "Surfaces", text: "Costal (ribs), mediastinal (cardiac impression), diaphragmatic (base). Apex projects into root of neck 2.5 cm above medial 1/3 clavicle." },
    { header: "Hilum", text: "Contains: main bronchus, pulmonary artery, 2 pulmonary veins, lymphatics, autonomic nerves." }
  ], { x: 0.3, y: 1.1, w: 5.0, h: 4.2, fontSize: 11 });

  addSlideNumber(slide, 6);
}

// ═══════════════════════════════════════════════════════════════════════════════
//  SLIDE 7 – Pleura
// ═══════════════════════════════════════════════════════════════════════════════
{
  const slide = pres.addSlide();
  addBackground(slide);
  addSectionBar(slide, "The Pleura & Pleural Reflections", "Parietal and visceral layers");

  const img = imgMap[IMG_URLS[5]];
  if (img) {
    slide.addImage({ data: img, x: 5.7, y: 0.85, w: 4.1, h: 4.5 });
  }

  addBullets(slide, [
    { header: "Visceral Pleura", text: "Closely adherent to lung surface; enters fissures. Innervated by autonomic fibers (insensitive to pain)." },
    { header: "Parietal Pleura", text: "Lines inner chest wall, diaphragm, mediastinum. Divisions: costal, diaphragmatic, mediastinal, cervical (cupola)." },
    { header: "Pleural Cavity", text: "Potential space with ~5 mL serous fluid; maintains negative pressure (−2 to −5 cmH₂O at rest) essential for lung inflation." },
    { header: "Costodiaphragmatic Recess", text: "Deepest part of pleural cavity (9th–10th rib level); fills only during deep inspiration; clinical site for thoracocentesis." },
    { header: "Costomediastinal Recess", text: "Anterior recess behind sternum; cardiac area. Contains pleural layers not occupied by lung at rest." },
    { header: "Nerve Supply", text: "Parietal pleura: intercostal nerves (costal) + phrenic n. (diaphragmatic). Pain-sensitive; referred to shoulder tip (phrenic irritation)." }
  ], { x: 0.3, y: 1.1, w: 5.2, h: 4.2, fontSize: 11 });

  addSlideNumber(slide, 7);
}

// ═══════════════════════════════════════════════════════════════════════════════
//  SLIDE 8 – Pulmonary Vasculature & Lymphatics
// ═══════════════════════════════════════════════════════════════════════════════
{
  const slide = pres.addSlide();
  addBackground(slide);
  addSectionBar(slide, "Pulmonary Vasculature & Lymphatics", "Functional and nutritive circulations");

  const img = imgMap[IMG_URLS[6]];
  if (img) {
    slide.addImage({ data: img, x: 5.5, y: 0.85, w: 4.3, h: 4.5 });
  }

  addBullets(slide, [
    { header: "Pulmonary Arteries", text: "Carry deoxygenated blood from RV. Right PA passes behind aorta & SVC; left PA arches over left main bronchus (ligamentum arteriosum)." },
    { header: "Pulmonary Veins", text: "Four veins (2 per side) drain to left atrium. Superior: upper & middle lobes (right), upper lobe (left). Inferior: lower lobes bilaterally." },
    { header: "Bronchial Arteries", text: "Nutritive supply to airways; usually 1 right (from 3rd intercostal or right subclavian) and 2 left (from thoracic aorta)." },
    { header: "Zone Physiology", text: "West's Zones 1–4: distribution of V̇/Q̇ ratio from apex (Zone 1, high V̇/Q̇) to base (Zone 3–4, low V̇/Q̇)." },
    { header: "Lymphatics", text: "Superficial (subpleural) and deep (peribronchial) networks; both drain into hilar nodes. Right lung → right lymphatic duct; left upper → thoracic duct." },
    { header: "Clinical", text: "Pulmonary embolism most commonly lodges at right lower lobe arteries. Hilar lymphadenopathy compresses bronchi → lobar collapse." }
  ], { x: 0.3, y: 1.1, w: 5.0, h: 4.2, fontSize: 11 });

  addSlideNumber(slide, 8);
}

// ═══════════════════════════════════════════════════════════════════════════════
//  SLIDE 9 – Clinical Topography & Surface Projections
// ═══════════════════════════════════════════════════════════════════════════════
{
  const slide = pres.addSlide();
  addBackground(slide);
  addSectionBar(slide, "Clinical Topography & Surface Projections", "Key landmarks for examination and procedures");

  const img = imgMap[IMG_URLS[7]];
  if (img) {
    slide.addImage({ data: img, x: 5.6, y: 0.85, w: 4.2, h: 4.5 });
  }

  addBullets(slide, [
    { header: "Lung Apex", text: "2.5 cm above medial 1/3 of clavicle; corresponds to Sibson's fascia overlying cupola of pleura." },
    { header: "Right Lung Borders", text: "Upper: 6th rib (MCL) → 8th (MAL) → 10th (scapular) → T12 (paravertebral). Left lung: one intercostal space lower." },
    { header: "Cardiac Dullness", text: "Left lung cardiac notch: 4th–6th ICS left sternal border; exposes pericardium for auscultation." },
    { header: "Thoracocentesis", text: "Needle above upper border of selected rib (5th–8th ICS, mid-axillary line); avoids neurovascular bundle in costal groove." },
    { header: "Tracheostomy", text: "Between 2nd–3rd or 3rd–4th tracheal rings; stay above 1st ring (subglottic stenosis risk) and below 4th (thyroid vessel damage)." },
    { header: "Mediastinal Relations", text: "Superior: trachea, oesophagus, great vessels. Anterior: thymus, pericardium. Posterior: oesophagus, thoracic aorta, azygos vein." }
  ], { x: 0.3, y: 1.1, w: 5.1, h: 4.2, fontSize: 11 });

  addSlideNumber(slide, 9);
}

// ─── Write file ───────────────────────────────────────────────────────────────
const outPath = "/home/daytona/workspace/respiratory-anatomy/Topographic_Anatomy_Respiratory_System.pptx";
pres.writeFile({ fileName: outPath })
  .then(() => console.log("✓ PPTX written to: " + outPath))
  .catch(e => { console.error("Error:", e); process.exit(1); });

const pptxgen = require("pptxgenjs");

// ─── Palette ──────────────────────────────────────────────────────────────────
const BG_DARK   = "0D2B45";
const BG_MID    = "10395A";
const ACCENT1   = "3AC9D6";
const ACCENT2   = "56CCF2";
const WHITE     = "FFFFFF";
const LIGHT_TXT = "C8E6F4";
const DIVIDER   = "1D5078";
const ACCENT_GOLD = "F2C94C";
const ACCENT_GREEN = "6FCF97";

const pres = new pptxgen();
pres.layout = "LAYOUT_16x9";
pres.title  = "Topographic Anatomy of the Respiratory System";
pres.author = "Medical Education";

// ─── Helpers ──────────────────────────────────────────────────────────────────
function addBackground(slide, color) {
  color = color || BG_DARK;
  slide.addShape(pres.ShapeType.rect, {
    x: 0, y: 0, w: 10, h: 5.625,
    fill: { color },
    line: { color, width: 0 }
  });
}

function addSlideNumber(slide, num) {
  slide.addText(num + " / 9", {
    x: 9.1, y: 5.3, w: 0.8, h: 0.25,
    fontSize: 8, color: ACCENT1, align: "right"
  });
}

function addHeader(slide, title, sub) {
  slide.addShape(pres.ShapeType.rect, {
    x: 0, y: 0, w: 0.18, h: 5.625,
    fill: { color: ACCENT1 }, line: { color: ACCENT1, width: 0 }
  });
  slide.addShape(pres.ShapeType.rect, {
    x: 0, y: 0, w: 10, h: 0.72,
    fill: { color: BG_MID }, line: { color: BG_MID, width: 0 }
  });
  slide.addText(title, {
    x: 0.3, y: 0.0, w: 8.5, h: 0.72,
    fontSize: 22, bold: true, color: ACCENT1, valign: "middle", margin: 0
  });
  if (sub) {
    slide.addText(sub, {
      x: 0.3, y: 0.75, w: 9.5, h: 0.28,
      fontSize: 10, color: LIGHT_TXT, italic: true, margin: 0
    });
  }
}

function addBullets(slide, items, x, y, w, h, fontSize) {
  x = x === undefined ? 0.3 : x;
  y = y === undefined ? 1.1 : y;
  w = w === undefined ? 4.5 : w;
  h = h === undefined ? 4.1 : h;
  fontSize = fontSize === undefined ? 11 : fontSize;

  var richText = [];
  for (var i = 0; i < items.length; i++) {
    var item = items[i];
    var isLast = (i === items.length - 1);
    if (typeof item === "string") {
      richText.push({ text: item, options: { bullet: true, color: LIGHT_TXT, fontSize: fontSize, breakLine: !isLast } });
    } else {
      richText.push({ text: item.h + ": ", options: { bold: true, color: ACCENT2, fontSize: fontSize, bullet: true } });
      richText.push({ text: item.t, options: { color: LIGHT_TXT, fontSize: fontSize, breakLine: !isLast } });
    }
  }
  slide.addText(richText, { x: x, y: y, w: w, h: h, valign: "top" });
}

// Anatomy label box
function addLabelBox(slide, label, val, x, y, w, col) {
  col = col || ACCENT1;
  slide.addShape(pres.ShapeType.roundRect, {
    x: x, y: y, w: w, h: 0.5,
    fill: { color: BG_MID }, line: { color: col, width: 1.2 },
    rectRadius: 0.06
  });
  slide.addText([
    { text: label + "  ", options: { bold: true, color: col, fontSize: 10 } },
    { text: val, options: { color: LIGHT_TXT, fontSize: 10 } }
  ], { x: x + 0.08, y: y, w: w - 0.1, h: 0.5, valign: "middle" });
}

// Draw anatomical silhouette shapes for slides without images
function addLungDiagram(slide, x, y) {
  // right lung
  slide.addShape(pres.ShapeType.roundRect, {
    x: x + 1.05, y: y, w: 0.85, h: 2.5,
    fill: { color: "1A4A6B" }, line: { color: ACCENT1, width: 1.2 },
    rectRadius: 0.3
  });
  // left lung
  slide.addShape(pres.ShapeType.roundRect, {
    x: x, y: y, w: 0.85, h: 2.35,
    fill: { color: "1A4A6B" }, line: { color: ACCENT2, width: 1.2 },
    rectRadius: 0.3
  });
  // trachea
  slide.addShape(pres.ShapeType.rect, {
    x: x + 0.85, y: y - 0.7, w: 0.2, h: 0.85,
    fill: { color: ACCENT1 }, line: { color: ACCENT1, width: 0 }
  });
  // labels
  slide.addText("R", { x: x + 1.28, y: y + 0.05, w: 0.4, h: 0.3, fontSize: 9, bold: true, color: ACCENT1, align: "center" });
  slide.addText("L", { x: x + 0.17, y: y + 0.05, w: 0.4, h: 0.3, fontSize: 9, bold: true, color: ACCENT2, align: "center" });
  slide.addText("Trachea", { x: x + 0.6, y: y - 0.9, w: 0.7, h: 0.25, fontSize: 7, color: ACCENT1, align: "center" });
}

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 1 – TITLE
// ═══════════════════════════════════════════════════════════════════════════════
var s1 = pres.addSlide();
addBackground(s1);

// Decorative circles
s1.addShape(pres.ShapeType.ellipse, { x: 6.8, y: -1.2, w: 4.8, h: 4.8, fill: { color: BG_MID }, line: { color: DIVIDER, width: 1 } });
s1.addShape(pres.ShapeType.ellipse, { x: 7.4, y: -0.6, w: 3.5, h: 3.5, fill: { color: "0B233A" }, line: { color: ACCENT1, width: 1.5 } });

// Lung silhouettes in circle
s1.addShape(pres.ShapeType.roundRect, { x: 7.95, y: 0.3, w: 0.75, h: 1.9, fill: { color: "1A4A6B" }, line: { color: ACCENT2, width: 1.2 }, rectRadius: 0.25 });
s1.addShape(pres.ShapeType.roundRect, { x: 8.8, y: 0.3, w: 0.75, h: 1.9, fill: { color: "1A4A6B" }, line: { color: ACCENT1, width: 1.2 }, rectRadius: 0.25 });
s1.addShape(pres.ShapeType.rect, { x: 8.68, y: -0.1, w: 0.15, h: 0.5, fill: { color: ACCENT1 }, line: { color: ACCENT1, width: 0 } });

// Left accent bar
s1.addShape(pres.ShapeType.rect, { x: 0, y: 2.0, w: 0.22, h: 1.6, fill: { color: ACCENT1 }, line: { color: ACCENT1, width: 0 } });

// Title text
s1.addText("TOPOGRAPHIC ANATOMY", { x: 0.35, y: 1.7, w: 7.0, h: 0.9, fontSize: 30, bold: true, color: WHITE, charSpacing: 2, margin: 0 });
s1.addText("OF THE RESPIRATORY SYSTEM", { x: 0.35, y: 2.5, w: 7.0, h: 0.65, fontSize: 21, bold: true, color: ACCENT1, charSpacing: 1, margin: 0 });
s1.addText("A comprehensive overview of upper and lower airways,\nlung morphology, pleura, and thoracic topography", {
  x: 0.35, y: 3.25, w: 6.5, h: 0.75, fontSize: 11, color: LIGHT_TXT, italic: true
});

var tags = ["Upper Airways", "Trachea & Bronchi", "Lung Lobes", "Pleura", "Vasculature", "Topography"];
for (var t = 0; t < tags.length; t++) {
  s1.addShape(pres.ShapeType.roundRect, { x: 0.35 + t * 1.58, y: 4.9, w: 1.5, h: 0.33, fill: { color: DIVIDER }, line: { color: ACCENT1, width: 0.75 }, rectRadius: 0.05 });
  s1.addText(tags[t], { x: 0.35 + t * 1.58, y: 4.9, w: 1.5, h: 0.33, fontSize: 7.5, color: ACCENT1, align: "center", valign: "middle" });
}
addSlideNumber(s1, 1);

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 2 – Upper Respiratory Tract
// ═══════════════════════════════════════════════════════════════════════════════
var s2 = pres.addSlide();
addBackground(s2);
addHeader(s2, "Upper Respiratory Tract", "Nasal cavity → Nasopharynx → Oropharynx → Laryngopharynx");

// Infographic column – right side
var structs = [
  { name: "Nasal Cavity", color: ACCENT1 },
  { name: "Nasopharynx", color: ACCENT2 },
  { name: "Oropharynx", color: ACCENT_GOLD },
  { name: "Laryngopharynx", color: ACCENT_GREEN }
];
for (var si = 0; si < structs.length; si++) {
  s2.addShape(pres.ShapeType.roundRect, {
    x: 5.6, y: 1.1 + si * 0.85, w: 4.1, h: 0.72,
    fill: { color: BG_MID }, line: { color: structs[si].color, width: 1.5 }, rectRadius: 0.07
  });
  s2.addText(structs[si].name, {
    x: 5.7, y: 1.1 + si * 0.85, w: 4.0, h: 0.72,
    fontSize: 13, bold: true, color: structs[si].color, valign: "middle", align: "center"
  });
}
// Connector arrow
s2.addShape(pres.ShapeType.rect, { x: 7.58, y: 1.82, w: 0.06, h: 2.55, fill: { color: DIVIDER }, line: { color: DIVIDER, width: 0 } });

// Key facts boxes row
var facts = [
  { l: "Turbinates", v: "3 pairs; warming & filtering" },
  { l: "Tonsils", v: "Waldeyer's ring; immunity" },
  { l: "Eustachian tube", v: "Opens into nasopharynx" },
  { l: "Epiglottis", v: "Divides oro- / hypopharynx" }
];
for (var fi = 0; fi < facts.length; fi++) {
  addLabelBox(s2, facts[fi].l, facts[fi].v, 5.6, 4.6 + (fi > 1 ? 0.58 : 0) - (fi < 2 ? 0 : 0), 4.1, fi < 2 ? ACCENT1 : ACCENT2);
}

addBullets(s2, [
  { h: "Nasal Cavity", t: "Nares to choanae; pseudo-stratified ciliated columnar epithelium; olfactory in superior turbinate region; paranasal sinuses drain into meatus." },
  { h: "Pharynx Zones", t: "Nasopharynx (skull base–soft palate), oropharynx (soft palate–epiglottis), hypopharynx/laryngopharynx (epiglottis–cricoid C6)." },
  { h: "Waldeyer's Ring", t: "Pharyngeal (adenoid), tubal (×2), palatine tonsils, lingual tonsil; forms immunological ring at oropharyngeal junction." },
  { h: "Blood Supply", t: "Sphenopalatine & anterior ethmoidal aa. to nasal cavity; ascending pharyngeal & facial aa. to pharynx. Kiesselbach's plexus = Little's area (anterior septum)." }
], 0.3, 1.1, 5.0, 4.1, 11);
addSlideNumber(s2, 2);

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 3 – Larynx
// ═══════════════════════════════════════════════════════════════════════════════
var s3 = pres.addSlide();
addBackground(s3);
addHeader(s3, "The Larynx", "Vertebral level C3–C6 · Gateway to lower airway");

// Cartilage diagram (schematic)
var carts = [
  { name: "Epiglottis", x: 5.9, y: 1.1, color: ACCENT_GOLD, h: 0.5 },
  { name: "Thyroid Cartilage", x: 5.9, y: 1.7, color: ACCENT1, h: 0.7 },
  { name: "Vocal Folds (True)", x: 5.9, y: 2.5, color: ACCENT2, h: 0.48 },
  { name: "Cricoid Cartilage", x: 5.9, y: 3.08, color: ACCENT_GREEN, h: 0.55 },
  { name: "Arytenoids (×2)", x: 5.9, y: 3.73, color: ACCENT_GOLD, h: 0.48 },
  { name: "Tracheal Ring 1", x: 5.9, y: 4.3, color: DIVIDER, h: 0.42 }
];
for (var ci = 0; ci < carts.length; ci++) {
  s3.addShape(pres.ShapeType.roundRect, {
    x: carts[ci].x, y: carts[ci].y, w: 3.85, h: carts[ci].h,
    fill: { color: BG_MID }, line: { color: carts[ci].color, width: 1.5 }, rectRadius: 0.05
  });
  s3.addText(carts[ci].name, {
    x: carts[ci].x + 0.08, y: carts[ci].y, w: 3.7, h: carts[ci].h,
    fontSize: 10.5, bold: true, color: carts[ci].color, valign: "middle"
  });
}
s3.addText("Superior →", { x: 5.9, y: 0.8, w: 1.5, h: 0.28, fontSize: 8, color: LIGHT_TXT, italic: true });
s3.addText("Inferior →", { x: 5.9, y: 4.74, w: 1.5, h: 0.28, fontSize: 8, color: LIGHT_TXT, italic: true });

addBullets(s3, [
  { h: "Cartilage Framework", t: "9 cartilages total: thyroid (Adam's apple, shields glottis), cricoid (only complete ring, C6), epiglottis (elastic), arytenoids, corniculates, cuneiforms." },
  { h: "Vocal Cords", t: "True cords: vocalis muscle + vocal ligament. False cords (vestibular folds) have no phonatory role. Rima glottidis = narrowest point in adults." },
  { h: "Intrinsic Muscles", t: "PCA = only abductor; LCA, transverse & oblique arytenoids = adductors; cricothyroid = tensor (external SLN); thyroarytenoid = relaxes." },
  { h: "Innervation", t: "Recurrent laryngeal n. (X) → all muscles except cricothyroid (ext. branch SLN). Sensory: above cords = int. SLN; below = RLN." },
  { h: "Clinical Significance", t: "Left RLN longer course around aortic arch → vulnerable in thoracic surgery & mediastinal masses. Croup: subglottic oedema → barking cough." }
], 0.3, 1.1, 5.3, 4.2, 11);
addSlideNumber(s3, 3);

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 4 – Trachea
// ═══════════════════════════════════════════════════════════════════════════════
var s4 = pres.addSlide();
addBackground(s4);
addHeader(s4, "The Trachea", "Cricoid cartilage (C6) → Carina (T4–T5)");

// Trachea schematic
var trachX = 7.4;
// main tube
s4.addShape(pres.ShapeType.roundRect, { x: trachX, y: 0.95, w: 1.0, h: 3.0, fill: { color: BG_MID }, line: { color: ACCENT1, width: 1.5 }, rectRadius: 0.15 });
// cartilage rings inside trachea
for (var r = 0; r < 6; r++) {
  s4.addShape(pres.ShapeType.rect, { x: trachX + 0.1, y: 1.05 + r * 0.42, w: 0.8, h: 0.22, fill: { color: ACCENT1 + "55" }, line: { color: ACCENT1, width: 0.8 } });
}
// bifurcation (carina)
s4.addShape(pres.ShapeType.line, { x: trachX + 0.5, y: 3.95, w: 0, h: 0, line: { color: ACCENT1, width: 0 } });
s4.addShape(pres.ShapeType.roundRect, { x: trachX - 0.75, y: 3.88, w: 0.9, h: 0.45, fill: { color: BG_MID }, line: { color: ACCENT2, width: 1.2 }, rectRadius: 0.12 });
s4.addShape(pres.ShapeType.roundRect, { x: trachX + 0.85, y: 3.88, w: 0.9, h: 0.45, fill: { color: BG_MID }, line: { color: ACCENT1, width: 1.2 }, rectRadius: 0.12 });
s4.addText("L Bronchus", { x: trachX - 0.75, y: 3.88, w: 0.9, h: 0.45, fontSize: 8.5, color: ACCENT2, align: "center", valign: "middle" });
s4.addText("R Bronchus", { x: trachX + 0.85, y: 3.88, w: 0.9, h: 0.45, fontSize: 8.5, color: ACCENT1, align: "center", valign: "middle" });
s4.addText("Cricoid C6", { x: trachX + 1.1, y: 0.95, w: 1.2, h: 0.3, fontSize: 8, color: ACCENT_GOLD, italic: true });
s4.addText("Carina T4-T5", { x: trachX + 1.1, y: 3.62, w: 1.2, h: 0.3, fontSize: 8, color: ACCENT_GOLD, italic: true });
s4.addText("16–20 rings", { x: trachX + 1.1, y: 1.9, w: 1.2, h: 0.28, fontSize: 8, color: LIGHT_TXT, italic: true });

addBullets(s4, [
  { h: "Dimensions", t: "10–11 cm long, ~2 cm diameter. 16–20 C-shaped hyaline cartilage rings (open posteriorly), connected by annular ligaments." },
  { h: "Posterior Wall", t: "Trachealis smooth muscle spans posterior gap between cartilage ends; allows food bolus to pass in adjacent oesophagus." },
  { h: "Carina", t: "T4–T5 bifurcation; right main bronchus: 25° from vertical, shorter & wider → right preferred site for inhaled foreign bodies & ETT misplacement." },
  { h: "Relations", t: "Anterior: thyroid isthmus (rings 2–4), thymus, aortic arch. Posterior: oesophagus. Lateral: common carotid aa., lobes of thyroid." },
  { h: "Histology", t: "Pseudostratified ciliated columnar (respiratory) epithelium; goblet cells; submucosal seromucous glands; lamina propria + submucosa." },
  { h: "Clinical", t: "Tracheostomy: 2nd–4th rings (avoid 1st ring = subglottic stenosis). ETT cuff at 2–3 cm above carina." }
], 0.3, 1.1, 5.2, 4.2, 11);
addSlideNumber(s4, 4);

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 5 – Bronchial Tree
// ═══════════════════════════════════════════════════════════════════════════════
var s5 = pres.addSlide();
addBackground(s5);
addHeader(s5, "The Bronchial Tree", "Generations 1–23: Trachea → Alveolar sacs");

// Branching diagram (right side)
var bx = 5.6, by = 1.1;
// trachea
s5.addShape(pres.ShapeType.rect, { x: bx + 1.4, y: by, w: 0.2, h: 0.5, fill: { color: ACCENT1 }, line: { color: ACCENT1, width: 0 } });
s5.addText("TRACHEA", { x: bx + 0.7, y: by - 0.25, w: 1.6, h: 0.28, fontSize: 8, color: ACCENT1, bold: true, align: "center" });
// L & R bronchi
s5.addShape(pres.ShapeType.rect, { x: bx + 1.4, y: by + 0.5, w: 0.2, h: 0.25, fill: { color: DIVIDER }, line: { color: DIVIDER, width: 0 } });
s5.addShape(pres.ShapeType.rect, { x: bx + 0.3, y: by + 0.75, w: 1.1, h: 0.12, fill: { color: DIVIDER }, line: { color: DIVIDER, width: 0 } });
s5.addShape(pres.ShapeType.rect, { x: bx + 1.6, y: by + 0.75, w: 1.1, h: 0.12, fill: { color: DIVIDER }, line: { color: DIVIDER, width: 0 } });
s5.addShape(pres.ShapeType.rect, { x: bx + 0.3, y: by + 0.75, w: 0.12, h: 0.35, fill: { color: DIVIDER }, line: { color: DIVIDER, width: 0 } });
s5.addShape(pres.ShapeType.rect, { x: bx + 2.58, y: by + 0.75, w: 0.12, h: 0.35, fill: { color: DIVIDER }, line: { color: DIVIDER, width: 0 } });

s5.addShape(pres.ShapeType.roundRect, { x: bx, y: by + 1.1, w: 0.75, h: 0.4, fill: { color: BG_MID }, line: { color: ACCENT2, width: 1.2 }, rectRadius: 0.05 });
s5.addText("L Bronchus", { x: bx, y: by + 1.1, w: 0.75, h: 0.4, fontSize: 8, color: ACCENT2, align: "center", valign: "middle" });
s5.addShape(pres.ShapeType.roundRect, { x: bx + 2.2, y: by + 1.1, w: 0.75, h: 0.4, fill: { color: BG_MID }, line: { color: ACCENT1, width: 1.2 }, rectRadius: 0.05 });
s5.addText("R Bronchus", { x: bx + 2.2, y: by + 1.1, w: 0.75, h: 0.4, fontSize: 8, color: ACCENT1, align: "center", valign: "middle" });

// lobar
var lobarL = ["L Upper", "Lingula", "L Lower"];
var lobarR = ["R Upper", "R Mid", "R Lower"];
for (var li = 0; li < 3; li++) {
  s5.addShape(pres.ShapeType.roundRect, { x: bx - 0.1 + li * 0.78, y: by + 1.9, w: 0.72, h: 0.38, fill: { color: "0B2E49" }, line: { color: ACCENT2, width: 0.8 }, rectRadius: 0.04 });
  s5.addText(lobarL[li], { x: bx - 0.1 + li * 0.78, y: by + 1.9, w: 0.72, h: 0.38, fontSize: 7.5, color: ACCENT2, align: "center", valign: "middle" });
  s5.addShape(pres.ShapeType.roundRect, { x: bx + 2.15 + li * 0.78, y: by + 1.9, w: 0.72, h: 0.38, fill: { color: "0B2E49" }, line: { color: ACCENT1, width: 0.8 }, rectRadius: 0.04 });
  s5.addText(lobarR[li], { x: bx + 2.15 + li * 0.78, y: by + 1.9, w: 0.72, h: 0.38, fontSize: 7.5, color: ACCENT1, align: "center", valign: "middle" });
}

// Segment count boxes
s5.addShape(pres.ShapeType.roundRect, { x: bx, y: by + 2.65, w: 2.3, h: 0.45, fill: { color: BG_MID }, line: { color: ACCENT2, width: 1 }, rectRadius: 0.06 });
s5.addText("8–10 segments (Left)", { x: bx, y: by + 2.65, w: 2.3, h: 0.45, fontSize: 9, color: ACCENT2, align: "center", valign: "middle" });
s5.addShape(pres.ShapeType.roundRect, { x: bx + 2.15, y: by + 2.65, w: 1.8, h: 0.45, fill: { color: BG_MID }, line: { color: ACCENT1, width: 1 }, rectRadius: 0.06 });
s5.addText("10 segments (Right)", { x: bx + 2.15, y: by + 2.65, w: 1.8, h: 0.45, fontSize: 9, color: ACCENT1, align: "center", valign: "middle" });

// Generation ladder (right far side)
var gens = ["Gen 0: Trachea", "Gen 1: Main bronchi", "Gen 2: Lobar bronchi", "Gen 3–4: Segmental", "Gen 5–16: Subsegmental", "Gen 17–19: Resp. bronchioles", "Gen 20–22: Alveolar ducts", "Gen 23: Alveolar sacs"];
for (var gi = 0; gi < gens.length; gi++) {
  s5.addText(gens[gi], { x: bx + 0.2, y: by + 3.3 + gi * 0.18, w: 3.6, h: 0.2, fontSize: 8, color: gi < 4 ? ACCENT1 : gi < 7 ? ACCENT2 : ACCENT_GREEN });
}

addBullets(s5, [
  { h: "Right Main Bronchus", t: "~2.5 cm; 25° from vertical; wider; more vertical = preferred path for inhaled foreign bodies; eparterial upper lobe bronchus." },
  { h: "Left Main Bronchus", t: "~5 cm; 45–50° from vertical; passes under aortic arch; hyparterial throughout." },
  { h: "Bronchopulmonary Segments", t: "10 right / 8–10 left; each an independent functional unit with its own bronchus, artery; veins are intersegmental." },
  { h: "Terminal Bronchioles", t: "Last purely conducting generation (Gen 16); no cartilage; smooth muscle only; calibre controlled by autonomic & local mediators." },
  { h: "Acinus", t: "Functional unit distal to terminal bronchiole: respiratory bronchioles + alveolar ducts + alveolar sacs (~300 million alveoli total)." }
], 0.3, 1.1, 5.0, 4.2, 11);
addSlideNumber(s5, 5);

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 6 – Lung Morphology
// ═══════════════════════════════════════════════════════════════════════════════
var s6 = pres.addSlide();
addBackground(s6);
addHeader(s6, "Lung Morphology & Lobar Anatomy", "Fissures, borders, and surface projections");

// Lung diagram schematic (right column)
var lx = 5.7, ly = 1.1;
// Right lung
s6.addShape(pres.ShapeType.roundRect, { x: lx + 1.5, y: ly, w: 1.6, h: 3.5, fill: { color: "1A3D5A" }, line: { color: ACCENT1, width: 1.5 }, rectRadius: 0.3 });
// Right lung horizontal fissure
s6.addShape(pres.ShapeType.line, { x: lx + 1.5, y: ly + 1.3, x2: lx + 3.1, y2: ly + 1.3, line: { color: ACCENT_GOLD, width: 1.2 } });
// Right lung oblique fissure
s6.addShape(pres.ShapeType.line, { x: lx + 1.5, y: ly + 0.9, x2: lx + 3.1, y2: ly + 3.5, line: { color: ACCENT2, width: 1.4 } });
// Lobe labels right
s6.addText("RUL", { x: lx + 1.6, y: ly + 0.1, w: 1.4, h: 0.4, fontSize: 10, bold: true, color: ACCENT1, align: "center" });
s6.addText("RML", { x: lx + 1.6, y: ly + 1.38, w: 1.4, h: 0.35, fontSize: 9, color: ACCENT_GOLD, align: "center" });
s6.addText("RLL", { x: lx + 2.3, y: ly + 2.2, w: 0.7, h: 0.4, fontSize: 10, bold: true, color: ACCENT2, align: "center" });

// Left lung
s6.addShape(pres.ShapeType.roundRect, { x: lx - 1.8, y: ly + 0.1, w: 1.55, h: 3.3, fill: { color: "1A3D5A" }, line: { color: ACCENT2, width: 1.5 }, rectRadius: 0.3 });
// Left oblique fissure
s6.addShape(pres.ShapeType.line, { x: lx - 1.8, y: ly + 0.55, x2: lx - 0.25, y2: ly + 3.3, line: { color: ACCENT2, width: 1.4 } });
s6.addText("LUL", { x: lx - 1.7, y: ly + 0.2, w: 1.35, h: 0.4, fontSize: 10, bold: true, color: ACCENT1, align: "center" });
s6.addText("LLL", { x: lx - 1.1, y: ly + 2.1, w: 0.8, h: 0.4, fontSize: 10, bold: true, color: ACCENT2, align: "center" });
s6.addText("Lingula", { x: lx - 1.7, y: ly + 2.6, w: 1.35, h: 0.3, fontSize: 8, color: ACCENT_GOLD, align: "center", italic: true });

// Legend
s6.addShape(pres.ShapeType.rect, { x: lx - 0.1, y: ly + 3.7, w: 0.35, h: 0.14, fill: { color: ACCENT_GOLD }, line: { color: ACCENT_GOLD, width: 0 } });
s6.addText("Horizontal fissure (right only)", { x: lx + 0.3, y: ly + 3.65, w: 2.4, h: 0.24, fontSize: 8, color: ACCENT_GOLD });
s6.addShape(pres.ShapeType.rect, { x: lx - 0.1, y: ly + 3.95, w: 0.35, h: 0.14, fill: { color: ACCENT2 }, line: { color: ACCENT2, width: 0 } });
s6.addText("Oblique fissure (bilateral)", { x: lx + 0.3, y: ly + 3.9, w: 2.4, h: 0.24, fontSize: 8, color: ACCENT2 });

addBullets(s6, [
  { h: "Right Lung", t: "3 lobes (upper, middle, lower); 2 fissures (oblique + horizontal); 10 bronchopulmonary segments; ~620 g; shorter and wider." },
  { h: "Left Lung", t: "2 lobes (upper, lower) + lingula of upper lobe; 1 oblique fissure; 8–10 segments; ~567 g; cardiac notch medially." },
  { h: "Oblique Fissure", t: "T2/T3 spinous process posteriorly → 6th rib at midclavicular line anteriorly; approximates medial border of scapula with arm elevated." },
  { h: "Horizontal Fissure", t: "Right lung only; from oblique fissure at mid-axillary line → 4th costal cartilage anteriorly; clinically absent in 50%." },
  { h: "Lung Apex", t: "Projects 2.5 cm above medial third of clavicle into root of neck. Sibson's fascia = suprapleural membrane covering the apex." },
  { h: "Hilum", t: "Wedge-shaped depression on mediastinal surface; transmits root of lung: main bronchus (posterior), pulmonary artery (superior), 2 pulmonary veins (anterior and inferior)." }
], 0.3, 1.1, 5.2, 4.2, 11);
addSlideNumber(s6, 6);

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 7 – Pleura
// ═══════════════════════════════════════════════════════════════════════════════
var s7 = pres.addSlide();
addBackground(s7);
addHeader(s7, "The Pleura & Pleural Reflections", "Parietal and visceral layers · Clinical recesses");

// Pleural diagram
var px = 5.6, py = 1.1;
// chest wall
s7.addShape(pres.ShapeType.roundRect, { x: px, y: py, w: 4.1, h: 4.2, fill: { color: "0B2032" }, line: { color: DIVIDER, width: 1.5 }, rectRadius: 0.2 });
// parietal pleura (inner lining of chest wall)
s7.addShape(pres.ShapeType.roundRect, { x: px + 0.2, y: py + 0.2, w: 3.7, h: 3.8, fill: { color: BG_MID }, line: { color: ACCENT_GOLD, width: 1.5 }, rectRadius: 0.18 });
// lung / visceral pleura
s7.addShape(pres.ShapeType.roundRect, { x: px + 0.65, y: py + 0.55, w: 2.8, h: 2.9, fill: { color: "1A3D5A" }, line: { color: ACCENT1, width: 1.5 }, rectRadius: 0.25 });
// costodiaphragmatic recess (bottom)
s7.addShape(pres.ShapeType.rect, { x: px + 0.2, y: py + 3.55, w: 3.7, h: 0.45, fill: { color: ACCENT2 + "44" }, line: { color: ACCENT2, width: 1.2 } });
s7.addText("Costodiaphragmatic Recess", { x: px + 0.3, y: py + 3.57, w: 3.5, h: 0.4, fontSize: 8.5, color: ACCENT2, align: "center", valign: "middle", bold: true });

// labels
s7.addText("Parietal Pleura", { x: px + 0.25, y: py + 0.22, w: 2.0, h: 0.3, fontSize: 9, bold: true, color: ACCENT_GOLD });
s7.addText("Pleural Space (~5 mL)", { x: px + 0.3, y: py + 1.0, w: 2.0, h: 0.3, fontSize: 8.5, color: LIGHT_TXT, italic: true });
s7.addText("Visceral Pleura", { x: px + 0.75, y: py + 0.6, w: 2.0, h: 0.28, fontSize: 9, bold: true, color: ACCENT1 });

addBullets(s7, [
  { h: "Visceral Pleura", t: "Intimately covers lung surface; folds into fissures. Insensitive to pain (autonomic supply). No lymphatics in visceral pleura lamina propria." },
  { h: "Parietal Pleura", t: "Lines chest wall (costal), diaphragm (diaphragmatic), mediastinum (mediastinal), and apex (cervical/cupola). Pain-sensitive via intercostal & phrenic nerves." },
  { h: "Pleural Cavity", t: "Potential space ~5 mL fluid; intrapleural pressure −2 to −5 cmH₂O at rest, −8 cmH₂O at maximal inspiration → lung expands with thorax." },
  { h: "Costodiaphragmatic Recess", t: "Between costal and diaphragmatic parietal pleura; deepest at 9th–10th rib level; clinical site for pleural effusion and thoracocentesis (triangle of safety)." },
  { h: "Costomediastinal Recess", t: "Anterior recess behind sternum at 4th ICS; exposes pericardium; relevant for pericardiocentesis approach." },
  { h: "Pneumothorax", t: "Air in pleural space abolishes negative pressure; lung collapses. Tension pneumothorax = air enters on inspiration only → mediastinal shift → obstructive shock." }
], 0.3, 1.1, 5.1, 4.2, 11);
addSlideNumber(s7, 7);

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 8 – Pulmonary Vasculature
// ═══════════════════════════════════════════════════════════════════════════════
var s8 = pres.addSlide();
addBackground(s8);
addHeader(s8, "Pulmonary Vasculature & Lymphatics", "Functional (pulmonary) and nutritive (bronchial) circulations");

// Vascular diagram
var vx = 5.6, vy = 1.0;
// heart icon
s8.addShape(pres.ShapeType.roundRect, { x: vx + 1.2, y: vy + 0.1, w: 1.5, h: 1.2, fill: { color: BG_MID }, line: { color: "E53935", width: 1.5 }, rectRadius: 0.1 });
s8.addText("♥ Heart", { x: vx + 1.2, y: vy + 0.1, w: 1.5, h: 1.2, fontSize: 14, bold: true, color: "E53935", align: "center", valign: "middle" });
// RV → PA → lungs
s8.addShape(pres.ShapeType.rect, { x: vx + 0.5, y: vy + 0.6, w: 0.7, h: 0.1, fill: { color: "5C6BC0" }, line: { color: "5C6BC0", width: 0 } });
s8.addText("RV→PA", { x: vx + 0.05, y: vy + 0.45, w: 0.9, h: 0.3, fontSize: 8, color: "9FA8DA", align: "center" });
// lung boxes
s8.addShape(pres.ShapeType.roundRect, { x: vx, y: vy + 1.1, w: 1.1, h: 1.1, fill: { color: "1A3D5A" }, line: { color: ACCENT2, width: 1.2 }, rectRadius: 0.12 });
s8.addText("Left\nLung", { x: vx, y: vy + 1.1, w: 1.1, h: 1.1, fontSize: 10, bold: true, color: ACCENT2, align: "center", valign: "middle" });
s8.addShape(pres.ShapeType.roundRect, { x: vx + 2.8, y: vy + 1.1, w: 1.1, h: 1.1, fill: { color: "1A3D5A" }, line: { color: ACCENT1, width: 1.2 }, rectRadius: 0.12 });
s8.addText("Right\nLung", { x: vx + 2.8, y: vy + 1.1, w: 1.1, h: 1.1, fontSize: 10, bold: true, color: ACCENT1, align: "center", valign: "middle" });
// PV → LA
s8.addShape(pres.ShapeType.rect, { x: vx + 2.7, y: vy + 0.6, w: 0.8, h: 0.1, fill: { color: "E53935" }, line: { color: "E53935", width: 0 } });
s8.addText("PV→LA", { x: vx + 2.8, y: vy + 0.45, w: 0.9, h: 0.3, fontSize: 8, color: "EF9A9A", align: "center" });

// West zones
s8.addText("West's Zones", { x: vx, y: vy + 2.4, w: 3.95, h: 0.3, fontSize: 9, bold: true, color: ACCENT_GOLD, align: "center" });
var zones = [
  { z: "Zone 1 (Apex)", v: "PA > Pa > Pv  Dead space", c: "9FA8DA" },
  { z: "Zone 2 (Mid)", v: "Pa > PA > Pv  Waterfall", c: ACCENT2 },
  { z: "Zone 3 (Base)", v: "Pa > Pv > PA  Best flow", c: ACCENT_GREEN },
  { z: "Zone 4 (Base++)", v: "Interstitial pressure ↑", c: ACCENT_GOLD }
];
for (var zi = 0; zi < zones.length; zi++) {
  s8.addShape(pres.ShapeType.roundRect, { x: vx, y: vy + 2.75 + zi * 0.45, w: 3.95, h: 0.38, fill: { color: BG_MID }, line: { color: zones[zi].c, width: 0.8 }, rectRadius: 0.04 });
  s8.addText([
    { text: zones[zi].z + ": ", options: { bold: true, color: zones[zi].c, fontSize: 8.5 } },
    { text: zones[zi].v, options: { color: LIGHT_TXT, fontSize: 8.5 } }
  ], { x: vx + 0.1, y: vy + 2.75 + zi * 0.45, w: 3.8, h: 0.38, valign: "middle" });
}

addBullets(s8, [
  { h: "Pulmonary Arteries", t: "Carry deoxygenated blood from RV. Right PA: behind ascending aorta & SVC. Left PA: anterior to descending aorta, arches over left main bronchus (ligamentum arteriosum)." },
  { h: "Pulmonary Veins", t: "4 veins drain to LA. Superior PVs: upper & middle lobes (right), upper lobe (left). Inferior PVs: lower lobes bilaterally. Anomalous drainage → ASD physiology." },
  { h: "Bronchial Circulation", t: "Nutritive supply to airways & pleura. Usually 1 right (from 3rd intercostal or right subclavian) and 2 left bronchial aa. (direct from aorta)." },
  { h: "Lymphatics", t: "Two networks: superficial (subpleural) + deep (peribronchial). Drain to bronchopulmonary (hilar) → tracheobronchial → paratracheal nodes." },
  { h: "Clinical", t: "PE most common in right lower lobe arteries. Hilar lymphadenopathy (sarcoid, TB, lymphoma) may compress bronchi. Bronchial artery embolization for haemoptysis." }
], 0.3, 1.1, 5.1, 4.2, 11);
addSlideNumber(s8, 8);

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 9 – Clinical Topography & Surface Projections
// ═══════════════════════════════════════════════════════════════════════════════
var s9 = pres.addSlide();
addBackground(s9);
addHeader(s9, "Clinical Topography & Surface Projections", "Landmark examination, percussion, and procedural anatomy");

// Torso silhouette with landmarks
var tx = 5.7, ty = 0.9;
// torso outline
s9.addShape(pres.ShapeType.roundRect, { x: tx + 0.7, y: ty, w: 2.5, h: 4.5, fill: { color: "0B2032" }, line: { color: DIVIDER, width: 1.5 }, rectRadius: 0.3 });
// rib lines
for (var ri = 0; ri < 8; ri++) {
  s9.addShape(pres.ShapeType.line, { x: tx + 0.7, y: ty + 0.55 + ri * 0.5, x2: tx + 3.2, y2: ty + 0.55 + ri * 0.5, line: { color: DIVIDER, width: 0.5 } });
}
// Lung apices
s9.addShape(pres.ShapeType.ellipse, { x: tx + 0.8, y: ty + 0.0, w: 0.5, h: 0.4, fill: { color: ACCENT1 + "66" }, line: { color: ACCENT1, width: 1 } });
s9.addShape(pres.ShapeType.ellipse, { x: tx + 2.55, y: ty + 0.0, w: 0.5, h: 0.4, fill: { color: ACCENT1 + "66" }, line: { color: ACCENT1, width: 1 } });
s9.addText("Apex 2.5cm above clavicle", { x: tx - 0.4, y: ty - 0.12, w: 1.5, h: 0.3, fontSize: 7, color: ACCENT1, align: "right" });

// Thoracocentesis zone
s9.addShape(pres.ShapeType.roundRect, { x: tx + 2.6, y: ty + 2.8, w: 0.8, h: 0.45, fill: { color: ACCENT2 + "55" }, line: { color: ACCENT2, width: 1.2 }, rectRadius: 0.05 });
s9.addText("✚ Thoracocentesis", { x: tx + 2.6, y: ty + 2.8, w: 0.8, h: 0.45, fontSize: 7, color: ACCENT2, align: "center", valign: "middle" });

// Tracheostomy level
s9.addShape(pres.ShapeType.rect, { x: tx + 1.45, y: ty + 0.55, w: 0.5, h: 0.35, fill: { color: ACCENT_GOLD + "66" }, line: { color: ACCENT_GOLD, width: 1 } });
s9.addText("Tracheostomy\n(2nd–4th rings)", { x: tx + 3.35, y: ty + 0.5, w: 1.1, h: 0.5, fontSize: 7, color: ACCENT_GOLD });

// Carina
s9.addShape(pres.ShapeType.ellipse, { x: tx + 1.5, y: ty + 1.55, w: 0.4, h: 0.3, fill: { color: ACCENT_GOLD + "55" }, line: { color: ACCENT_GOLD, width: 1 } });
s9.addText("Carina T4–T5", { x: tx + 3.35, y: ty + 1.5, w: 1.1, h: 0.3, fontSize: 7, color: ACCENT_GOLD });
// lines to labels
s9.addShape(pres.ShapeType.line, { x: tx + 1.9, y: ty + 1.7, x2: tx + 3.3, y2: ty + 1.65, line: { color: DIVIDER, width: 0.5 } });
s9.addShape(pres.ShapeType.line, { x: tx + 1.95, y: ty + 0.72, x2: tx + 3.3, y2: ty + 0.72, line: { color: DIVIDER, width: 0.5 } });

// Oblique fissure line (both sides)
s9.addShape(pres.ShapeType.line, { x: tx + 0.7, y: ty + 0.5, x2: tx + 3.2, y2: ty + 4.2, line: { color: ACCENT2, width: 1.0 } });
s9.addText("Oblique fissure", { x: tx - 0.8, y: ty + 2.6, w: 1.5, h: 0.28, fontSize: 7.5, color: ACCENT2, align: "right" });

addBullets(s9, [
  { h: "Lung Borders (Anterior)", t: "Both lungs: 2nd rib level behind sternoclavicular joint → midline at sternal angle (T4) → diverge. Right: straight to 6th costal cartilage. Left: cardiac notch at 4th ICS." },
  { h: "Lung Borders (Inferior)", t: "Right lung: 6th rib (MCL) → 8th rib (MAL) → 10th rib (paravertebral T10). Left: approx one intercostal space lower." },
  { h: "Thoracocentesis", t: "Triangle of safety: anterior – lateral border of pectoralis major; posterior – lateral border of latissimus dorsi; inferior – 5th ICS / base of axilla. Needle over upper rib border." },
  { h: "Percussion Notes", t: "Resonant over normal lung; dull over consolidation/effusion; stony dull = effusion; hyper-resonant = pneumothorax or emphysema." },
  { h: "Tracheostomy", t: "2nd–4th tracheal rings; avoid ring 1 (subglottic stenosis); keep midline to avoid thyroid vessels. Emergency: cricothyrotomy through cricothyroid membrane." },
  { h: "Mediastinal Relations", t: "Superior: trachea, oesophagus, great vessels. Anterior: thymus, pericardium. Posterior: oesophagus, thoracic aorta, azygos vein, sympathetic chain." }
], 0.3, 1.1, 5.2, 4.2, 11);
addSlideNumber(s9, 9);

// ─── Write file ───────────────────────────────────────────────────────────────
var outPath = "/home/daytona/workspace/respiratory-anatomy/Topographic_Anatomy_Respiratory_System.pptx";
pres.writeFile({ fileName: outPath })
  .then(function() { console.log("DONE: " + outPath); })
  .catch(function(e) { console.error("Error:", e); process.exit(1); });

const pptxgen = require("pptxgenjs");
const fs = require("fs");

// Load base64 images from disk
function loadImg(n) {
  try { return fs.readFileSync("/home/daytona/workspace/respiratory-anatomy/img" + n + ".b64", "utf8").trim(); }
  catch(e) { return null; }
}

const imgs = [
  loadImg(0), // upper resp tract overview (sagittal + lung)
  loadImg(1), // larynx dissection
  loadImg(2), // trachea 3D CT
  loadImg(3), // bronchial tree diagram (Bailey & Love)
  loadImg(4), // lung lobes diagram (lateral/medial)
  loadImg(5), // left lung gross oblique fissure
  loadImg(6), // CT chest axial lobes
  loadImg(7), // gross respiratory specimen (trachea+lungs)
];

// ─── Palette ──────────────────────────────────────────────────────────────────
const BG      = "0A1E2E";
const BG2     = "0E2D45";
const PANEL   = "112840";
const CYAN    = "2EC4D6";
const BLUE    = "4A90D9";
const GOLD    = "F5A623";
const GREEN   = "5DB075";
const WHITE   = "FFFFFF";
const LTXT    = "B8D9F0";
const DIVIDER = "1A4060";

const pres = new pptxgen();
pres.layout = "LAYOUT_16x9";
pres.title  = "Topographic Anatomy of the Respiratory System";

// ─── Helpers ──────────────────────────────────────────────────────────────────
function bg(slide, c) {
  c = c || BG;
  slide.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:5.625, fill:{color:c}, line:{color:c,width:0} });
}

function header(slide, title, sub) {
  // top gradient-like band
  slide.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:0.78, fill:{color:BG2}, line:{color:BG2,width:0} });
  // cyan left accent bar
  slide.addShape(pres.ShapeType.rect, { x:0, y:0, w:0.2, h:5.625, fill:{color:CYAN}, line:{color:CYAN,width:0} });
  // accent dot
  slide.addShape(pres.ShapeType.ellipse, { x:0.35, y:0.18, w:0.4, h:0.4, fill:{color:CYAN}, line:{color:CYAN,width:0} });
  slide.addText(title, { x:0.85, y:0.04, w:8.8, h:0.55, fontSize:20, bold:true, color:WHITE, valign:"middle", margin:0 });
  if (sub) slide.addText(sub, { x:0.85, y:0.6, w:9.0, h:0.22, fontSize:9, color:CYAN, italic:true, margin:0 });
}

function pgnum(slide, n) {
  slide.addText(n+"/9", { x:9.3, y:5.35, w:0.6, h:0.22, fontSize:8, color:CYAN, align:"right" });
}

// Image panel (right half) with rounded frame
function imgPanel(slide, b64, x, y, w, h, caption) {
  x = x===undefined ? 5.45 : x;
  y = y===undefined ? 0.88 : y;
  w = w===undefined ? 4.35 : w;
  h = h===undefined ? 4.3  : h;
  // background frame
  slide.addShape(pres.ShapeType.roundRect, { x:x-0.08, y:y-0.08, w:w+0.16, h:h+0.16+0.25, fill:{color:PANEL}, line:{color:CYAN,width:1.2}, rectRadius:0.1 });
  if (b64) {
    slide.addImage({ data:b64, x:x, y:y, w:w, h:h, sizing:{type:"contain", w:w, h:h} });
  }
  if (caption) {
    slide.addText(caption, { x:x-0.08, y:y+h+0.04, w:w+0.16, h:0.22, fontSize:7.5, color:CYAN, italic:true, align:"center" });
  }
}

// Bullet list on left panel
function bullets(slide, items, x, y, w, h, fs) {
  x  = x===undefined  ? 0.28 : x;
  y  = y===undefined  ? 0.9  : y;
  w  = w===undefined  ? 4.9  : w;
  h  = h===undefined  ? 4.4  : h;
  fs = fs===undefined ? 11   : fs;
  const rt = [];
  items.forEach(function(item, i) {
    const last = i === items.length - 1;
    if (typeof item === "string") {
      rt.push({ text: item, options:{ bullet:true, color:LTXT, fontSize:fs, breakLine:!last, paraSpaceAfter:2 } });
    } else {
      rt.push({ text: item.h+": ", options:{ bold:true, color:CYAN, fontSize:fs, bullet:true } });
      rt.push({ text: item.t, options:{ color:LTXT, fontSize:fs, breakLine:!last, paraSpaceAfter:2 } });
    }
  });
  slide.addText(rt, { x:x, y:y, w:w, h:h, valign:"top" });
}

function divLine(slide, y) {
  slide.addShape(pres.ShapeType.rect, { x:0.25, y:y, w:5.05, h:0.02, fill:{color:DIVIDER}, line:{color:DIVIDER,width:0} });
}

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 1 – TITLE
// ═══════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  bg(s);

  // decorative rings
  s.addShape(pres.ShapeType.ellipse, { x:6.2, y:-1.5, w:6, h:6, fill:{color:BG2}, line:{color:DIVIDER,width:1.5} });
  s.addShape(pres.ShapeType.ellipse, { x:7.0, y:-0.7, w:4.4, h:4.4, fill:{color:"081525"}, line:{color:CYAN,width:2} });

  // lung silhouette pair in circle
  [[7.5,0.5,BLUE],[8.6,0.5,CYAN]].forEach(function(l) {
    s.addShape(pres.ShapeType.roundRect, { x:l[0], y:l[1], w:0.9, h:2.1, fill:{color:BG2}, line:{color:l[2],width:1.5}, rectRadius:0.3 });
  });
  s.addShape(pres.ShapeType.rect, { x:8.44, y:0.1, w:0.18, h:0.5, fill:{color:CYAN}, line:{color:CYAN,width:0} });
  s.addText("Trachea", { x:8.1, y:-0.08, w:0.9, h:0.22, fontSize:7, color:CYAN, align:"center" });

  // left bar
  s.addShape(pres.ShapeType.rect, { x:0, y:2.0, w:0.22, h:1.7, fill:{color:CYAN}, line:{color:CYAN,width:0} });

  s.addText("TOPOGRAPHIC ANATOMY", { x:0.35, y:1.65, w:7.0, h:0.85, fontSize:31, bold:true, color:WHITE, charSpacing:2, margin:0 });
  s.addText("OF THE RESPIRATORY SYSTEM", { x:0.35, y:2.45, w:7.0, h:0.7, fontSize:22, bold:true, color:CYAN, charSpacing:1, margin:0 });
  s.addText("A comprehensive topographic overview of the upper airway,\ntrachea, bronchial tree, lungs, pleura, vasculature, and\nclinical surface projections — with anatomical diagrams.", {
    x:0.35, y:3.25, w:6.5, h:0.95, fontSize:10.5, color:LTXT, italic:true
  });

  const tags = ["Upper Airway","Larynx","Trachea","Bronchi","Lungs & Pleura","Vasculature","Topography"];
  tags.forEach(function(t,i) {
    if (i < 4) {
      s.addShape(pres.ShapeType.roundRect, { x:0.35+i*2.35, y:4.9, w:2.2, h:0.32, fill:{color:DIVIDER}, line:{color:CYAN,width:0.8}, rectRadius:0.05 });
      s.addText(t, { x:0.35+i*2.35, y:4.9, w:2.2, h:0.32, fontSize:8, color:CYAN, align:"center", valign:"middle" });
    } else {
      s.addShape(pres.ShapeType.roundRect, { x:0.35+(i-4)*2.35, y:5.27, w:2.2, h:0.32, fill:{color:DIVIDER}, line:{color:BLUE,width:0.8}, rectRadius:0.05 });
      s.addText(t, { x:0.35+(i-4)*2.35, y:5.27, w:2.2, h:0.32, fontSize:8, color:BLUE, align:"center", valign:"middle" });
    }
  });
  pgnum(s,1);
}

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 2 – Upper Respiratory Tract
// ═══════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  bg(s);
  header(s, "Upper Respiratory Tract", "Nasal cavity · Pharynx · Laryngopharynx");

  imgPanel(s, imgs[0], 5.45, 0.88, 4.35, 4.3,
    "Sagittal cross-section: upper & lower respiratory tracts");

  bullets(s, [
    { h:"Nasal Cavity", t:"Extends from nares to choanae; pseudostratified ciliated columnar epithelium; 3 turbinates (superior, middle, inferior) increase surface area for air warming and humidification." },
    { h:"Paranasal Sinuses", t:"Maxillary (largest), frontal, ethmoid (anterior/posterior), sphenoid; drain via ostia into nasal meatus; lined by respiratory mucosa." },
    { h:"Nasopharynx", t:"Skull base to soft palate; contains pharyngeal tonsil (adenoid) and Eustachian tube openings (medial wall of each fossa of Rosenmüller)." },
    { h:"Oropharynx", t:"Soft palate to epiglottis; bounded laterally by palatine tonsils; posterior pharyngeal wall overlies C2–C3 vertebrae." },
    { h:"Laryngopharynx", t:"Epiglottis to cricoid (C6); opens anteriorly into larynx, posteriorly into oesophagus. Piriform recesses = bilateral lateral channels flanking larynx." },
    { h:"Blood Supply", t:"Nasal cavity: sphenopalatine a., anterior & posterior ethmoidal aa.; Kiesselbach's plexus (Little's area) on anterior septum = most common site of epistaxis." },
  ], 0.28, 0.9, 5.0, 4.4, 10.5);
  pgnum(s,2);
}

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 3 – The Larynx
// ═══════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  bg(s);
  header(s, "The Larynx", "Vertebral level C3–C6 · Voice production · Airway protection");

  imgPanel(s, imgs[1], 5.45, 0.88, 4.35, 4.3,
    "Dissected larynx: anterior view (left) & midsagittal section (right)");

  bullets(s, [
    { h:"Location & Framework", t:"Anterior neck C3–C6; 9 cartilages: thyroid (largest, Adam's apple), cricoid (only complete ring, C6), epiglottis (elastic cartilage), paired arytenoids, corniculates, cuneiforms." },
    { h:"Vocal Folds", t:"True cords = vocalis muscle + vocal ligament; rima glottidis is the narrowest part of the adult airway. False cords (vestibular folds) lie superiorly, are not involved in phonation." },
    { h:"Intrinsic Muscles", t:"Abductor: posterior cricoarytenoid (PCA) only. Adductors: lateral cricoarytenoid, transverse & oblique arytenoids. Tensor: cricothyroid. Relaxor: thyroarytenoid (vocalis)." },
    { h:"Innervation", t:"All intrinsic muscles (except cricothyroid) → recurrent laryngeal nerve (CN X). Cricothyroid → external branch of superior laryngeal nerve. Sensory above cords: internal SLN; below: RLN." },
    { h:"Spaces", t:"Supraglottic (vestibule), glottic (between true cords), infraglottic/subglottic. Laryngeal ventricle lies between true and false cords." },
    { h:"Clinical", t:"Left RLN loops around aortic arch → vulnerable in thoracic surgery/mediastinal masses. Croup: subglottic oedema → steeple sign on X-ray, inspiratory stridor." },
  ], 0.28, 0.9, 5.0, 4.4, 10.5);
  pgnum(s,3);
}

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 4 – The Trachea
// ═══════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  bg(s);
  header(s, "The Trachea", "Cricoid (C6) to carina (T4–T5) · 10–11 cm · 16–20 cartilage rings");

  imgPanel(s, imgs[2], 5.45, 0.88, 4.35, 4.3,
    "3D CT reconstruction: trachea, carina & primary bronchi (focal tracheal narrowing arrowed)");

  bullets(s, [
    { h:"Structure", t:"16–20 C-shaped hyaline cartilage rings open posteriorly; connected by annular (cricotracheal) ligaments. ~10–11 cm long, ~2 cm diameter. Lumen oval in adults, circular in children." },
    { h:"Trachealis Muscle", t:"Smooth muscle spans the posterior membranous wall; contracts during coughing (reduces diameter ~30%); allows oesophageal distension during swallowing." },
    { h:"Carina", t:"T4–T5 level (sternal angle of Louis). Right main bronchus: 25° from vertical, shorter (~2.5 cm), wider → preferred path for inhaled foreign bodies and endobronchial tube misplacement." },
    { h:"Anatomical Relations", t:"Anterior: thyroid isthmus (rings 2–4), thymus, aortic arch. Posterior: oesophagus (throughout). Lateral: carotid sheaths, thyroid lobes." },
    { h:"Histology", t:"Pseudostratified ciliated columnar epithelium; goblet cells; basal cells; submucosal seromucous glands; elastic lamina propria. Mucociliary escalator clears debris cranially." },
    { h:"Tracheostomy", t:"Rings 2–4 between thyroid isthmus and suprasternal notch. Avoid ring 1 (subglottic stenosis risk); avoid below ring 4 (thyroid vessels, brachiocephalic artery)." },
  ], 0.28, 0.9, 5.0, 4.4, 10.5);
  pgnum(s,4);
}

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 5 – Bronchial Tree
// ═══════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  bg(s);
  header(s, "The Bronchial Tree", "23 generations: trachea → alveolar sacs · ~300 million alveoli");

  imgPanel(s, imgs[3], 5.45, 0.88, 4.35, 4.3,
    "Bronchial tree diagram: lobar and segmental divisions (Bailey & Love's Surgery)");

  bullets(s, [
    { h:"Main Bronchi", t:"Right: ~2.5 cm, 25° from vertical, wider. Left: ~5 cm, 45–50° from vertical, passes under aortic arch. Eparterial bronchus = right upper lobe bronchus (above right PA)." },
    { h:"Lobar Bronchi", t:"Right: 3 (upper, middle, lower). Left: 2 (upper, lower) + lingular bronchus from left upper. Each lobe has independent blood supply and lymphatic drainage." },
    { h:"Bronchopulmonary Segments", t:"10 segments right; 8–10 left. Each = independent functional unit supplied by 1 segmental bronchus + 1 segmental artery; veins are intersegmental (surgical boundary)." },
    { h:"Conducting Zone", t:"Gens 1–16 (trachea → terminal bronchioles): no gas exchange; dead space ~150 mL. Bronchi have cartilage; bronchioles (< 1 mm) do not — held open by radial elastic traction." },
    { h:"Respiratory Zone", t:"Gens 17–23 (respiratory bronchioles → alveolar sacs): gas exchange occurs. Alveolar surface area ~70 m². Type I pneumocytes = gas exchange; Type II = surfactant (reduces surface tension)." },
    { h:"Clinical", t:"Mucus plugging in asthma/CF → subsegmental atelectasis. Terminal bronchioles are site of small airway disease in COPD (reduced radial traction → dynamic collapse on expiration)." },
  ], 0.28, 0.9, 5.0, 4.4, 10.5);
  pgnum(s,5);
}

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 6 – Lung Morphology & Lobar Anatomy
// ═══════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  bg(s);
  header(s, "Lung Morphology & Lobar Anatomy", "Lobes · Fissures · Surfaces · Hilum");

  imgPanel(s, imgs[4], 5.45, 0.88, 4.35, 4.3,
    "Right & left lung: lateral/medial views, fissures, cardiac area and pleural dome labelled");

  bullets(s, [
    { h:"Right Lung", t:"3 lobes (upper, middle, lower); 2 fissures: oblique (major) + horizontal (minor). 10 bronchopulmonary segments. Weight ~620 g; shorter and wider; more vertical hilum." },
    { h:"Left Lung", t:"2 lobes (upper, lower) + lingula of upper lobe; 1 oblique fissure only. 8–10 segments. Weight ~567 g; cardiac notch on anterior medial surface; longer and narrower." },
    { h:"Oblique Fissure", t:"Both lungs. Runs from T2–T3 spinous process posteriorly → 6th rib at MCL anteriorly; roughly follows medial border of scapula with arm at 90°." },
    { h:"Horizontal Fissure", t:"Right lung only. From oblique fissure at mid-axillary line → 4th costal cartilage at sternum. Clinically absent/incomplete in ~50% of adults." },
    { h:"Lung Surfaces", t:"Costal (faces ribs/intercostals), mediastinal (faces mediastinum, has hilum + cardiac impression), diaphragmatic (base, concave). Apex projects 2.5 cm above medial 1/3 clavicle." },
    { h:"Hilum", t:"Wedge-shaped depression on mediastinal surface (T5–T7); transmits: main bronchus (posterior/superior), pulmonary artery (anterior to bronchus), 2 pulmonary veins (inferior/anterior)." },
  ], 0.28, 0.9, 5.0, 4.4, 10.5);
  pgnum(s,6);
}

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 7 – The Pleura
// ═══════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  bg(s);
  header(s, "The Pleura & Pleural Reflections", "Parietal · Visceral · Recesses · Negative pressure physiology");

  imgPanel(s, imgs[5], 5.45, 0.88, 4.35, 4.3,
    "Left lung gross specimen: complete oblique fissure (arrow) separating upper and lower lobes");

  bullets(s, [
    { h:"Visceral Pleura", t:"Closely adherent to lung surface, dips into fissures. Supplied by bronchial vessels; drained by pulmonary veins. Insensitive to pain (no somatic afferents)." },
    { h:"Parietal Pleura", t:"Lines inner chest wall (costal), diaphragm (diaphragmatic), mediastinum (mediastinal), apex (cervical/cupola = Sibson's fascia). Pain-sensitive: intercostal nn. (costal) + phrenic n. (central diaphragm)." },
    { h:"Pleural Cavity", t:"~5 mL serous fluid. Intrapleural pressure: −2 to −5 cmH₂O at rest; −8 cmH₂O at full inspiration. Negative pressure keeps lung apposed to chest wall → lung expands with thorax." },
    { h:"Costodiaphragmatic Recess", t:"Deepest pleural recess (8th–10th rib level at MAL); fills only on deep inspiration. Triangle of safety = preferred site for thoracocentesis and chest drain insertion." },
    { h:"Costomediastinal Recess", t:"Anterior recess behind sternum; exposes pericardium medially at 4th ICS; relevant during pericardiocentesis and cardiac surgery." },
    { h:"Pneumothorax", t:"Air enters → pressure equalises → lung collapses. Tension: one-way valve effect → mediastinal shift + raised JVP + hypotension. Treatment: immediate needle decompression then chest drain." },
  ], 0.28, 0.9, 5.0, 4.4, 10.5);
  pgnum(s,7);
}

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 8 – Pulmonary Vasculature & Lymphatics
// ═══════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  bg(s);
  header(s, "Pulmonary Vasculature & Lymphatics", "Functional circulation · Bronchial circulation · West's Zones · Lymphatic drainage");

  imgPanel(s, imgs[6], 5.45, 0.88, 4.35, 4.3,
    "Axial CT chest (lung window): lobar divisions with oblique (solid arrows) and horizontal (dotted arrows) fissures");

  bullets(s, [
    { h:"Pulmonary Arteries", t:"Carry deoxygenated blood from RV. Right PA: posterior to ascending aorta & SVC. Left PA: anterior to descending aorta, arches over left main bronchus; connected to aorta by ligamentum arteriosum (obliterated ductus)." },
    { h:"Pulmonary Veins", t:"4 veins drain to left atrium. Superior PVs: upper & middle lobes (right), upper lobe (left). Inferior PVs: lower lobes bilaterally. Extrapulmonary segments lie in pericardium." },
    { h:"Bronchial Circulation", t:"Nutritive supply to airways & visceral pleura. Usually 1 right bronchial a. (from 3rd intercostal or right subclavian) and 2 left bronchial aa. (directly from thoracic aorta at T5–T6)." },
    { h:"West's Zones", t:"Zone 1 (apex): PA > Pa > Pv — dead space. Zone 2 (mid): Pa > PA > Pv — waterfall effect. Zone 3 (base): Pa > Pv > PA — maximal flow. Zone 4: ↑ interstitial pressure → reduced flow." },
    { h:"Lymphatics", t:"Two networks: superficial (subpleural) + deep (peribronchial/perivascular). Both drain to bronchopulmonary (hilar) → tracheobronchial → paratracheal nodes. Right lung + left lower → right lymphatic duct; left upper → thoracic duct." },
    { h:"Clinical", t:"PE most common in right lower lobe arteries. Hilar lymphadenopathy (sarcoid, TB, lymphoma) compresses bronchi → lobar collapse. Bronchial artery embolization for massive haemoptysis." },
  ], 0.28, 0.9, 5.0, 4.4, 10.5);
  pgnum(s,8);
}

// ═══════════════════════════════════════════════════════════════════════════════
// SLIDE 9 – Clinical Topography & Surface Projections
// ═══════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  bg(s);
  header(s, "Clinical Topography & Surface Projections", "Landmarks for examination, percussion, and bedside procedures");

  imgPanel(s, imgs[7], 5.45, 0.88, 4.35, 4.3,
    "Gross specimen: opened trachea, carina and bilateral lung cross-sections (interstitial changes visible)");

  bullets(s, [
    { h:"Lung Apex", t:"Projects 2.5 cm above medial 1/3 clavicle → root of neck (Sibson's fascia). Accessible for subclavian central line; risk of apical pneumothorax. Cervical rib may compress apex (Pancoast syndrome)." },
    { h:"Anterior Lung Borders", t:"Both lungs meet at 2nd rib (behind SC joint) → sternum at sternal angle → T4. Right: straight to 6th costal cartilage. Left: cardiac notch deviates left at 4th ICS → 6th costal cartilage." },
    { h:"Inferior Lung Borders", t:"Right lung: 6th rib (MCL) → 8th rib (MAL) → 10th rib (scapular line) → T10 (paravertebral). Left: approximately one intercostal space lower. Pleural reflection: 2 ribs lower than lung border." },
    { h:"Thoracocentesis", t:"Triangle of safety (lateral chest): anterior border = lateral pectoralis major; posterior = anterior latissimus dorsi; inferior = 5th ICS/axillary base. Insert needle above upper border of chosen rib (avoid neurovascular bundle in costal groove)." },
    { h:"Percussion Notes", t:"Resonant = normal lung; Dull = consolidation/collapse; Stony dull = effusion; Hyper-resonant = pneumothorax or emphysema. Cardiac dullness: 4th–6th ICS left sternal edge (left lung cardiac notch exposed)." },
    { h:"Mediastinal Relationships", t:"Superior mediastinum: trachea, oesophagus, SVC, aortic arch, thoracic duct. Anterior: thymus, pericardium. Posterior: oesophagus, thoracic aorta, azygos vein, thoracic sympathetic chain (stellate ganglion)." },
  ], 0.28, 0.9, 5.0, 4.4, 10.5);
  pgnum(s,9);
}

// ─── Write ────────────────────────────────────────────────────────────────────
const outPath = "/home/daytona/workspace/respiratory-anatomy/Topographic_Anatomy_Respiratory_System_v2.pptx";
pres.writeFile({ fileName: outPath })
  .then(() => console.log("DONE: " + outPath))
  .catch(e => { console.error(e); process.exit(1); });