mkdir -p /home/daytona/workspace/deep-cervical-fascia-ppt && ls /home/daytona/wo…

~/deep-cervical-fascia-ppt/build.js

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

// Fetch images as base64
const imageUrls = [
  "https://cdn.orris.care/cdss_images/1658b844e467872164dd0b460001610cf8cf024526c01d1289963a72d8bbba6c.png",
  "https://cdn.orris.care/cdss_images/3ebad59d7f34c1fdc66ef59228e40deb3fd753c3ae1ac8a417e8c0ad7d35469e.png",
  "https://cdn.orris.care/cdss_images/e94c9f99b5b4bb3d2980f79290b23131ca226b83a0111804014d4f0f6197085f.png"
];

const images = JSON.parse(
  execSync(
    `node /home/daytona/skills/shared/scripts/fetch_images.js ${imageUrls.map(u => `"${u}"`).join(" ")}`
  ).toString()
);

const img_fascia_layers = images[0].base64;   // Axial cross-section of neck fascial layers
const img_axial_parapharyngeal = images[1].base64; // Axial showing parapharyngeal space
const img_sagittal_spaces = images[2].base64; // Sagittal showing danger space

// ============================================================
// COLOR PALETTE  — deep blue-navy theme (medical/professional)
// ============================================================
const C = {
  navy:    "0D2B55",
  blue:    "1A5276",
  teal:    "0E6B8E",
  accent:  "F0C040",   // golden accent
  white:   "FFFFFF",
  light:   "E8F1F8",
  text:    "1A1A2E",
  subtext: "4A5568",
  slide_bg:"0D2B55",
  content_bg: "EEF4FA",
  red:     "C0392B",
  green:   "1A7A4A",
  orange:  "D35400",
};

const pres = new pptxgen();
pres.layout = "LAYOUT_16x9";
pres.title = "Deep Cervical Fascia";
pres.author = "Anatomy Department – 1st BHMS";

// ============================================================
// Helper: background rect (full slide)
// ============================================================
function bgRect(slide, color) {
  slide.addShape(pres.ShapeType.rect, {
    x: 0, y: 0, w: "100%", h: "100%",
    fill: { color },
    line: { type: "none" }
  });
}

function topBar(slide, color = C.teal) {
  slide.addShape(pres.ShapeType.rect, {
    x: 0, y: 0, w: "100%", h: 1.0,
    fill: { color },
    line: { type: "none" }
  });
}

function accentLine(slide, y = 1.0) {
  slide.addShape(pres.ShapeType.rect, {
    x: 0, y, w: "100%", h: 0.06,
    fill: { color: C.accent },
    line: { type: "none" }
  });
}

function sectionLabel(slide, text, x, y, w = 3.5, color = C.navy) {
  slide.addShape(pres.ShapeType.rect, {
    x, y, w, h: 0.38,
    fill: { color },
    line: { type: "none" },
    rectRadius: 0.05
  });
  slide.addText(text, {
    x, y, w, h: 0.38,
    fontSize: 13, bold: true, color: C.accent,
    align: "center", valign: "middle", margin: 0
  });
}

// ============================================================
// SLIDE 1 — Title slide
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.navy);

  // Decorative accent blocks
  slide.addShape(pres.ShapeType.rect, { x: 0, y: 4.5, w: "100%", h: 1.125, fill: { color: C.teal }, line: { type: "none" } });
  slide.addShape(pres.ShapeType.rect, { x: 0, y: 4.5, w: "100%", h: 0.1, fill: { color: C.accent }, line: { type: "none" } });
  slide.addShape(pres.ShapeType.rect, { x: 7.5, y: 0, w: 0.12, h: "100%", fill: { color: C.accent }, line: { type: "none" } });

  slide.addText("DEEP CERVICAL FASCIA", {
    x: 0.5, y: 0.7, w: 6.8, h: 1.1,
    fontSize: 40, bold: true, color: C.white,
    align: "left", fontFace: "Calibri Light", charSpacing: 4
  });
  slide.addShape(pres.ShapeType.rect, { x: 0.5, y: 1.78, w: 4.5, h: 0.07, fill: { color: C.accent }, line: { type: "none" } });

  slide.addText("Anatomy of Cervical Fascial Layers, Spaces & Clinical Significance", {
    x: 0.5, y: 1.95, w: 6.8, h: 0.6,
    fontSize: 17, italic: true, color: "BDD9F0",
    align: "left", fontFace: "Calibri"
  });

  slide.addText([
    { text: "Subject: ", options: { bold: true, color: C.accent } },
    { text: "Anatomy  |  ", options: { color: C.white } },
    { text: "Year: ", options: { bold: true, color: C.accent } },
    { text: "1st BHMS  |  ", options: { color: C.white } },
    { text: "Topic: ", options: { bold: true, color: C.accent } },
    { text: "Head & Neck Anatomy", options: { color: C.white } }
  ], {
    x: 0.5, y: 2.65, w: 9, h: 0.4, fontSize: 14, valign: "middle"
  });

  slide.addText("Department of Anatomy", {
    x: 0, y: 4.6, w: "100%", h: 0.45,
    fontSize: 14, bold: true, color: C.white,
    align: "center", valign: "middle"
  });
  slide.addText("Source: Scott-Brown's Otorhinolaryngology | KJ Lee's Essential Otolaryngology", {
    x: 0, y: 5.1, w: "100%", h: 0.35,
    fontSize: 10, italic: true, color: "BDD9F0",
    align: "center", valign: "middle"
  });
}

// ============================================================
// SLIDE 2 — Learning Objectives
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.content_bg);
  topBar(slide, C.navy);
  accentLine(slide, 1.0);

  slide.addText("Learning Objectives", {
    x: 0.3, y: 0.1, w: 9, h: 0.8,
    fontSize: 26, bold: true, color: C.white, align: "left", valign: "middle", margin: 0
  });

  const objectives = [
    { num: "01", text: "Define deep cervical fascia and distinguish it from superficial cervical fascia" },
    { num: "02", text: "Describe the three layers of deep cervical fascia with their attachments" },
    { num: "03", text: "Explain the carotid sheath — contents and clinical importance" },
    { num: "04", text: "Describe the alar fascia and the 'danger space'" },
    { num: "05", text: "Identify the deep neck spaces formed by fascial boundaries" },
    { num: "06", text: "Understand the clinical relevance — infection spread, neck dissection" },
  ];

  objectives.forEach((obj, i) => {
    const col = i < 3 ? 0 : 1;
    const row = i % 3;
    const x = col === 0 ? 0.3 : 5.2;
    const y = 1.25 + row * 1.2;

    slide.addShape(pres.ShapeType.rect, {
      x, y, w: 4.5, h: 1.0,
      fill: { color: col === 0 ? C.navy : C.teal },
      line: { type: "none" }, shadow: { type: "outer", blur: 4, offset: 2, angle: 45, color: "AAAAAA", opacity: 0.3 }
    });
    slide.addText(obj.num, {
      x: x + 0.1, y: y + 0.05, w: 0.55, h: 0.45,
      fontSize: 22, bold: true, color: C.accent, align: "center", valign: "middle", margin: 0
    });
    slide.addText(obj.text, {
      x: x + 0.7, y: y + 0.08, w: 3.6, h: 0.82,
      fontSize: 12.5, color: C.white, align: "left", valign: "middle"
    });
  });
}

// ============================================================
// SLIDE 3 — Overview: What is Deep Cervical Fascia?
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.content_bg);
  topBar(slide, C.blue);
  accentLine(slide, 1.0);

  slide.addText("What is Deep Cervical Fascia?", {
    x: 0.3, y: 0.1, w: 9, h: 0.8,
    fontSize: 26, bold: true, color: C.white, align: "left", valign: "middle", margin: 0
  });

  // Left text column
  const points = [
    { h: "Definition", t: "Dense connective tissue deep to the platysma and superficial cervical fascia, forming a fascial cylinder that contains most structures of the neck, including all nodal stations." },
    { h: "Layers (3)", t: "1. Investing (Superficial) Layer\n2. Pretracheal (Middle/Visceral) Layer\n3. Prevertebral (Deep) Layer\n+ Carotid Sheath (derived from investing layer)" },
    { h: "Origin", t: "Arises from the ligamentum nuchae and spinous processes of cervical vertebrae posteriorly; invests the entire neck." },
    { h: "Key Fact", t: "Fascial planes act as dissection tunnels in surgery and as corridors for spread of infection or neoplasia between neck spaces." },
  ];

  let yp = 1.15;
  points.forEach(p => {
    slide.addText(p.h, {
      x: 0.4, y: yp, w: 2.0, h: 0.35,
      fontSize: 13, bold: true, color: C.accent,
      fill: { color: C.navy }, align: "center", valign: "middle", margin: 4
    });
    slide.addText(p.t, {
      x: 0.4, y: yp + 0.35, w: 5.5, h: 0.72,
      fontSize: 12, color: C.text, align: "left", valign: "top"
    });
    yp += 1.15;
  });

  // Right image
  if (img_fascia_layers) {
    slide.addImage({ data: img_fascia_layers, x: 6.1, y: 1.1, w: 3.7, h: 4.2 });
    slide.addText("Fig: Axial cross-section showing fascial layers of the neck", {
      x: 6.1, y: 5.28, w: 3.7, h: 0.3,
      fontSize: 9, italic: true, color: C.subtext, align: "center"
    });
  }
}

// ============================================================
// SLIDE 4 — Layer 1: Investing (Superficial) Layer
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.content_bg);
  topBar(slide, C.navy);
  accentLine(slide);

  slide.addText("Layer 1: Investing (Superficial) Layer", {
    x: 0.3, y: 0.1, w: 9, h: 0.8,
    fontSize: 24, bold: true, color: C.white, align: "left", valign: "middle", margin: 0
  });
  sectionLabel(slide, "Also called: Superficial Layer of DCF", 0.3, 1.1, 5.5, C.teal);

  const rows = [
    ["Encloses (Muscles)", "SCM, Trapezius, Omohyoid, Infrahyoid muscles"],
    ["Encloses (Glands)", "Parotid gland (as parotid fascia) & Submandibular gland"],
    ["Superior Attachment", "Superior nuchal line, Mastoid process, Zygomatic arch, Inferior border of mandible, Hyoid bone"],
    ["Inferior Attachment", "Manubrium sterni, Clavicle, Acromion & Spine of scapula"],
    ["Posterior Attachment", "Spinous processes of cervical vertebrae, Ligamentum nuchae"],
    ["Forms", "Roof of anterior & posterior triangles | Parotid capsule | Stylomandibular ligament"],
    ["Splits to form", "Suprasternal space of Burns (anteroinferiorly)"],
    ["Key Clinical Point", "Encases ALL cervical lymph node stations; acts as barrier — abscesses track DEEP to this layer"],
  ];

  rows.forEach(([label, val], i) => {
    const y = 1.6 + i * 0.5;
    const bgColor = i % 2 === 0 ? "DDEAF7" : C.white;
    slide.addShape(pres.ShapeType.rect, { x: 0.3, y, w: 9.4, h: 0.48, fill: { color: bgColor }, line: { color: "B0C8E0", w: 0.5 } });
    slide.addText(label, { x: 0.35, y: y + 0.02, w: 2.6, h: 0.44, fontSize: 11.5, bold: true, color: C.navy, valign: "middle" });
    slide.addText(val, { x: 3.0, y: y + 0.02, w: 6.6, h: 0.44, fontSize: 11.5, color: C.text, valign: "middle" });
  });
}

// ============================================================
// SLIDE 5 — Layer 2: Pretracheal (Middle/Visceral) Layer
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.content_bg);
  topBar(slide, C.teal);
  accentLine(slide);

  slide.addText("Layer 2: Pretracheal (Middle / Visceral) Layer", {
    x: 0.3, y: 0.1, w: 9, h: 0.8,
    fontSize: 24, bold: true, color: C.white, align: "left", valign: "middle", margin: 0
  });
  sectionLabel(slide, "Derived from the investing layer", 0.3, 1.1, 4.5, C.blue);

  // Two-column cards
  const leftCards = [
    { title: "Muscular Division", body: "Invests the strap (infrahyoid) muscles:\n• Sternohyoid\n• Sternothyroid\n• Thyrohyoid\n• Omohyoid" },
    { title: "Superior Attachment", body: "Hyoid bone (and base of skull for visceral part)" },
    { title: "Inferior Extension", body: "Descends into the superior mediastinum; blends with the fibrous pericardium" },
  ];
  const rightCards = [
    { title: "Visceral Division", body: "Invests viscera:\n• Pharynx / Larynx\n• Trachea & Oesophagus\n• Thyroid & Parathyroid glands\n• Buccinator & Pharyngeal constrictors" },
    { title: "Special Component", body: "Buccopharyngeal fascia — overlies pharyngeal wall; forms anterior border of retropharyngeal space" },
    { title: "Clinical Relevance", body: "Bounds a deep space extending neck → mediastinum; connects laterally to carotid sheath via loose areolar tissue" },
  ];

  leftCards.forEach((card, i) => {
    const y = 1.6 + i * 1.3;
    slide.addShape(pres.ShapeType.rect, { x: 0.3, y, w: 4.5, h: 1.2, fill: { color: C.navy }, line: { type: "none" } });
    slide.addText(card.title, { x: 0.4, y: y + 0.05, w: 4.2, h: 0.3, fontSize: 12.5, bold: true, color: C.accent });
    slide.addText(card.body, { x: 0.4, y: y + 0.35, w: 4.2, h: 0.8, fontSize: 11.5, color: C.white, valign: "top" });
  });
  rightCards.forEach((card, i) => {
    const y = 1.6 + i * 1.3;
    slide.addShape(pres.ShapeType.rect, { x: 5.1, y, w: 4.7, h: 1.2, fill: { color: C.blue }, line: { type: "none" } });
    slide.addText(card.title, { x: 5.2, y: y + 0.05, w: 4.4, h: 0.3, fontSize: 12.5, bold: true, color: C.accent });
    slide.addText(card.body, { x: 5.2, y: y + 0.35, w: 4.4, h: 0.8, fontSize: 11.5, color: C.white, valign: "top" });
  });
}

// ============================================================
// SLIDE 6 — Layer 3: Prevertebral (Deep) Layer + Alar Fascia
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.content_bg);
  topBar(slide, C.navy);
  accentLine(slide);

  slide.addText("Layer 3: Prevertebral (Deep) Layer & Alar Fascia", {
    x: 0.3, y: 0.1, w: 9.2, h: 0.8,
    fontSize: 23, bold: true, color: C.white, align: "left", valign: "middle", margin: 0
  });

  // Left column - prevertebral layer
  slide.addShape(pres.ShapeType.rect, { x: 0.3, y: 1.1, w: 4.5, h: 2.05, fill: { color: C.navy }, line: { type: "none" } });
  slide.addText("Prevertebral Fascia", { x: 0.4, y: 1.15, w: 4.2, h: 0.35, fontSize: 14, bold: true, color: C.accent });
  slide.addText([
    { text: "Encloses: ", options: { bold: true, color: C.accent } },
    { text: "Paraspinous muscles, scalene muscles, cervical vertebrae\n", options: { color: C.white } },
    { text: "Superior: ", options: { bold: true, color: C.accent } },
    { text: "Base of skull\n", options: { color: C.white } },
    { text: "Inferior: ", options: { bold: true, color: C.accent } },
    { text: "Fuses with anterior longitudinal ligament at T3\n", options: { color: C.white } },
    { text: "Lateral: ", options: { bold: true, color: C.accent } },
    { text: "Extends as the axillary sheath\n", options: { color: C.white } },
    { text: "Function: ", options: { bold: true, color: C.accent } },
    { text: "Floor of posterior triangle; deep margin of neck dissection (protects phrenic nerve & brachial plexus)", options: { color: C.white } },
  ], { x: 0.4, y: 1.52, w: 4.2, h: 1.55, fontSize: 11, valign: "top" });

  // Right column - alar fascia
  slide.addShape(pres.ShapeType.rect, { x: 5.1, y: 1.1, w: 4.7, h: 2.05, fill: { color: C.teal }, line: { type: "none" } });
  slide.addText("Alar Fascia", { x: 5.2, y: 1.15, w: 4.4, h: 0.35, fontSize: 14, bold: true, color: C.accent });
  slide.addText([
    { text: "Position: ", options: { bold: true, color: C.accent } },
    { text: "Between deep and middle layers of DCF\n", options: { color: C.white } },
    { text: "Superior: ", options: { bold: true, color: C.accent } },
    { text: "Base of skull\n", options: { color: C.white } },
    { text: "Inferior: ", options: { bold: true, color: C.accent } },
    { text: "Posterior mediastinum (~T2 vertebra)\n", options: { color: C.white } },
    { text: "Covers: ", options: { bold: true, color: C.accent } },
    { text: "Cervical sympathetic trunk\n", options: { color: C.white } },
    { text: "Significance: ", options: { bold: true, color: C.accent } },
    { text: "Forms posterior wall of retropharyngeal space & anterior wall of 'danger space'", options: { color: C.white } },
  ], { x: 5.2, y: 1.52, w: 4.4, h: 1.55, fontSize: 11, valign: "top" });

  // Danger space box
  slide.addShape(pres.ShapeType.rect, { x: 0.3, y: 3.28, w: 9.5, h: 1.0, fill: { color: C.red }, line: { type: "none" } });
  slide.addText("⚠  DANGER SPACE", { x: 0.4, y: 3.3, w: 3, h: 0.4, fontSize: 14, bold: true, color: C.white });
  slide.addText("Potential space between alar fascia (anteriorly) and prevertebral fascia (posteriorly). Extends from the skull base to the DIAPHRAGM — infection here can descend into the chest rapidly. Clinically life-threatening!", {
    x: 0.4, y: 3.7, w: 9.2, h: 0.5, fontSize: 11.5, color: C.white, valign: "top"
  });

  // Sagittal image
  if (img_sagittal_spaces) {
    slide.addImage({ data: img_sagittal_spaces, x: 0.3, y: 4.38, w: 2.8, h: 1.1 });
    slide.addText("Fig: Sagittal view — Danger space & alar fascia", {
      x: 3.2, y: 4.5, w: 6.5, h: 0.4, fontSize: 10, italic: true, color: C.subtext
    });
  }
}

// ============================================================
// SLIDE 7 — Carotid Sheath
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.content_bg);
  topBar(slide, C.blue);
  accentLine(slide);

  slide.addText("Carotid Sheath", {
    x: 0.3, y: 0.1, w: 9, h: 0.8,
    fontSize: 26, bold: true, color: C.white, align: "left", valign: "middle", margin: 0
  });

  // Left info
  const carotidFacts = [
    { k: "Derivation", v: "From the investing layer of deep cervical fascia (medial to SCM)" },
    { k: "Contents", v: "Common Carotid Artery (CCA)\nInternal & External Carotid Arteries (post-bifurcation)\nInternal Jugular Vein (IJV)\nVagus Nerve (CN X)" },
    { k: "Wall thickness", v: "Thicker around arteries; loose/thin around IJV (allows expansion in high venous flow states)" },
    { k: "Connections", v: "Connected to all three layers of DCF by loose areolar tissue" },
    { k: "Other structures", v: "Contains: Glossopharyngeal nerve, Hypoglossal nerve, Sympathetic chain, Associated lymph nodes (post-styloid compartment)" },
    { k: "Clinical pearl", v: "Carotid sheath involvement in deep neck infection = vascular complications (carotid artery erosion, IJV thrombophlebitis — Lemierre's syndrome)" },
  ];

  carotidFacts.forEach(({ k, v }, i) => {
    const y = 1.18 + i * 0.73;
    slide.addShape(pres.ShapeType.rect, { x: 0.3, y, w: 5.6, h: 0.68, fill: { color: i % 2 === 0 ? "DDEAF7" : C.white }, line: { color: "B0C8E0", w: 0.5 } });
    slide.addText(k, { x: 0.35, y: y + 0.04, w: 1.8, h: 0.6, fontSize: 11, bold: true, color: C.navy, valign: "middle" });
    slide.addText(v, { x: 2.2, y: y + 0.04, w: 3.6, h: 0.6, fontSize: 11, color: C.text, valign: "middle" });
  });

  // Right image
  if (img_axial_parapharyngeal) {
    slide.addImage({ data: img_axial_parapharyngeal, x: 6.2, y: 1.1, w: 3.6, h: 3.8 });
    slide.addText("Fig: Axial section — carotid sheath, parapharyngeal space & great vessels", {
      x: 6.2, y: 4.92, w: 3.6, h: 0.4, fontSize: 9, italic: true, color: C.subtext, align: "center"
    });
  }
}

// ============================================================
// SLIDE 8 — Deep Neck Spaces
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.content_bg);
  topBar(slide, C.navy);
  accentLine(slide);

  slide.addText("Deep Neck Spaces", {
    x: 0.3, y: 0.1, w: 9, h: 0.8,
    fontSize: 26, bold: true, color: C.white, align: "left", valign: "middle", margin: 0
  });

  const spaces = [
    {
      name: "Submental Space",
      color: C.navy,
      body: "Borders: Submental triangle boundaries\nDeep limit: Mylohyoid & Geniohyoid\nContains: Level Ia lymph nodes"
    },
    {
      name: "Submandibular Space",
      color: C.teal,
      body: "Clinical: Route for spread between neck & floor of mouth (Ludwig's angina)\nBorders: Investing DCF from mandible to hyoid\nBellies of Digastric form anterior/posterior limits"
    },
    {
      name: "Parapharyngeal Space",
      color: C.blue,
      body: "Shape: Inverted cone (base = petrous temporal; apex = hyoid)\nDivided by styloid process → Pre-styloid & Post-styloid compartments\nPost-styloid = carotid sheath, CN IX, CN XII, sympathetic chain"
    },
    {
      name: "Retropharyngeal Space",
      color: "5B2C6F",
      body: "Between: Middle DCF (ant.) and Alar fascia (post.)\nCraniocaudal extent: Skull base → Tracheal bifurcation\nContains: Retropharyngeal lymph nodes (important in children)"
    },
    {
      name: "Danger Space",
      color: C.red,
      body: "Between: Alar fascia (ant.) and Prevertebral fascia (post.)\nExtent: Skull base → DIAPHRAGM\nClinical: Rapid spread of infection into posterior mediastinum"
    },
    {
      name: "Prevertebral Space",
      color: "1A5276",
      body: "Anterior to prevertebral fascia / vertebral bodies\nExtent: Skull base → Coccyx\nClinical: Pott's abscess (TB spine) can track along this space"
    },
  ];

  spaces.forEach((sp, i) => {
    const col = i % 2;
    const row = Math.floor(i / 2);
    const x = col === 0 ? 0.3 : 5.2;
    const y = 1.12 + row * 1.52;
    slide.addShape(pres.ShapeType.rect, { x, y, w: 4.55, h: 1.42, fill: { color: sp.color }, line: { type: "none" } });
    slide.addText(sp.name, { x: x + 0.1, y: y + 0.06, w: 4.2, h: 0.32, fontSize: 13, bold: true, color: C.accent });
    slide.addText(sp.body, { x: x + 0.1, y: y + 0.4, w: 4.3, h: 0.95, fontSize: 10.5, color: C.white, valign: "top" });
  });
}

// ============================================================
// SLIDE 9 — Clinical Significance
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.content_bg);
  topBar(slide, C.teal);
  accentLine(slide);

  slide.addText("Clinical Significance", {
    x: 0.3, y: 0.1, w: 9, h: 0.8,
    fontSize: 26, bold: true, color: C.white, align: "left", valign: "middle", margin: 0
  });

  const clinics = [
    {
      title: "Deep Neck Space Infections",
      icon: "🦠",
      color: "C0392B",
      body: "Fascial compartments guide spread of odontogenic, tonsillar, or salivary infections. Ludwig's angina (submandibular space) can cause airway compromise. Retropharyngeal abscess is most common in children < 6 years."
    },
    {
      title: "Mediastinitis via Danger Space",
      icon: "⚠️",
      color: "E67E22",
      body: "Infections tracking through the danger space can reach the posterior mediastinum and diaphragm — a life-threatening surgical emergency requiring mediastinal drainage."
    },
    {
      title: "Neck Dissection Surgery",
      icon: "🔪",
      color: "1A5276",
      body: "Prevertebral fascia = deep limit of radical neck dissection. Fascial planes act as dissection tunnels. Investing fascia encases all nodal stations (levels I–V) targeted in dissection."
    },
    {
      title: "Carotid Sheath Pathology",
      icon: "💉",
      color: "6C3483",
      body: "Lemierre's syndrome: IJV thrombophlebitis with septic emboli. Carotid blow-out: erosion of carotid artery by infection or tumour. Horner's syndrome: sympathetic chain involvement."
    },
    {
      title: "Airway Compromise",
      icon: "🫁",
      color: "1A7A4A",
      body: "Investing fascia barrier may cause accumulating abscess to compress the airway even before pointing externally. Always assess airway in deep neck infections."
    },
    {
      title: "Pott's Disease (TB Spine)",
      icon: "🦴",
      color: "784212",
      body: "Cold abscess from vertebral TB can descend along the prevertebral space (skull base to coccyx) and present as a fluctuant swelling in the neck or groin."
    },
  ];

  clinics.forEach((c, i) => {
    const col = i % 2;
    const row = Math.floor(i / 2);
    const x = col === 0 ? 0.3 : 5.2;
    const y = 1.15 + row * 1.48;
    slide.addShape(pres.ShapeType.rect, { x, y, w: 4.55, h: 1.38, fill: { color: c.color }, line: { type: "none" } });
    slide.addText(`${c.icon}  ${c.title}`, { x: x + 0.1, y: y + 0.06, w: 4.3, h: 0.32, fontSize: 13, bold: true, color: C.accent });
    slide.addText(c.body, { x: x + 0.1, y: y + 0.4, w: 4.3, h: 0.9, fontSize: 10.5, color: C.white, valign: "top" });
  });
}

// ============================================================
// SLIDE 10 — Comparison Table: All Layers
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.content_bg);
  topBar(slide, C.navy);
  accentLine(slide);

  slide.addText("Summary Comparison: Layers of Deep Cervical Fascia", {
    x: 0.3, y: 0.1, w: 9.2, h: 0.8,
    fontSize: 22, bold: true, color: C.white, align: "left", valign: "middle", margin: 0
  });

  const headers = ["Layer", "Also Known As", "Encloses", "Superior", "Inferior", "Significance"];
  const rows2 = [
    ["Investing (Superficial)", "Superficial DCF", "SCM, Trapezius, Omohyoid, Parotid, Submandibular", "Nuchal line, Mastoid, Zygoma, Mandible, Hyoid", "Manubrium, Clavicle, Acromion", "Encloses all nodes; barrier to spread"],
    ["Pretracheal (Middle)", "Visceral / Muscular fascia", "Strap muscles, Thyroid, Trachea, Pharynx, Oesophagus", "Hyoid / Skull base", "Superior mediastinum / Fibrous pericardium", "Bounds pretracheal & retropharyngeal spaces"],
    ["Prevertebral (Deep)", "Prevertebral fascia", "Paraspinous & scalene muscles, Vertebral column", "Skull base", "T3 / Anterior longitudinal ligament", "Floor of posterior triangle; limit of neck dissection"],
    ["Alar Fascia", "Component of deep layer", "Cervical sympathetic trunk", "Skull base", "T2 – Posterior mediastinum", "Posterior wall of retropharyngeal space"],
    ["Carotid Sheath", "Derived from investing layer", "CCA, ICA, ECA, IJV, CN X", "Skull base", "Superior mediastinum", "Vascular corridor; Lemierre's, carotid blow-out"],
  ];

  const colW = [1.9, 1.7, 2.2, 1.6, 1.6, 1.8];
  const colX = [0.15, 2.05, 3.75, 5.95, 7.55, 9.15];  // cumulative

  // Draw header
  let xpos = 0.15;
  headers.forEach((h, i) => {
    slide.addShape(pres.ShapeType.rect, { x: xpos, y: 1.1, w: colW[i], h: 0.42, fill: { color: C.navy }, line: { color: "8BAAC8", w: 0.5 } });
    slide.addText(h, { x: xpos, y: 1.1, w: colW[i], h: 0.42, fontSize: 11, bold: true, color: C.accent, align: "center", valign: "middle", margin: 2 });
    xpos += colW[i];
  });

  rows2.forEach((row, ri) => {
    let xr = 0.15;
    row.forEach((cell, ci) => {
      const bg = ri % 2 === 0 ? "DDEAF7" : C.white;
      slide.addShape(pres.ShapeType.rect, { x: xr, y: 1.52 + ri * 0.8, w: colW[ci], h: 0.76, fill: { color: bg }, line: { color: "B0C8E0", w: 0.5 } });
      slide.addText(cell, { x: xr + 0.03, y: 1.54 + ri * 0.8, w: colW[ci] - 0.06, h: 0.72, fontSize: 9.5, color: C.text, valign: "middle", align: ci === 0 ? "center" : "left" });
      xr += colW[ci];
    });
  });
}

// ============================================================
// SLIDE 11 — Mnemonics & Quick Recall
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.navy);
  topBar(slide, C.teal);
  accentLine(slide);

  slide.addText("Mnemonics & Quick Recall", {
    x: 0.3, y: 0.1, w: 9, h: 0.8,
    fontSize: 26, bold: true, color: C.white, align: "left", valign: "middle", margin: 0
  });

  // Mnemonic 1 box
  slide.addShape(pres.ShapeType.rect, { x: 0.3, y: 1.15, w: 9.4, h: 1.1, fill: { color: C.teal }, line: { type: "none" } });
  slide.addText("Layers of DCF — \"I Prefer Depth\"", { x: 0.5, y: 1.18, w: 9, h: 0.38, fontSize: 16, bold: true, color: C.accent });
  slide.addText("I = Investing (Superficial) Layer    |    P = Pretracheal (Middle) Layer    |    D = Prevertebral (Deep) Layer", {
    x: 0.5, y: 1.56, w: 9, h: 0.62, fontSize: 13, color: C.white, align: "center", valign: "middle"
  });

  // Carotid sheath contents
  slide.addShape(pres.ShapeType.rect, { x: 0.3, y: 2.4, w: 4.5, h: 1.6, fill: { color: "1A3C5E" }, line: { type: "none" } });
  slide.addText("Carotid Sheath Contents", { x: 0.4, y: 2.45, w: 4.2, h: 0.35, fontSize: 14, bold: true, color: C.accent });
  slide.addText('"VAN" — inside → outside\n• V = Vagus nerve (medially)\n• A = Artery (Common/Internal Carotid)\n• N = (Internal Jugular) veiN (laterally)', {
    x: 0.4, y: 2.8, w: 4.2, h: 1.1, fontSize: 12.5, color: C.white, valign: "top"
  });

  // Spaces box
  slide.addShape(pres.ShapeType.rect, { x: 5.1, y: 2.4, w: 4.7, h: 1.6, fill: { color: "1A3C5E" }, line: { type: "none" } });
  slide.addText("Deep Neck Spaces — \"SAD RDP\"", { x: 5.2, y: 2.45, w: 4.4, h: 0.35, fontSize: 14, bold: true, color: C.accent });
  slide.addText("S = Submental\nA = Submandibular (sAliva!)\nD = Danger space\nR = Retropharyngeal\nD = Parapharyngeal (pharynx)\nP = Prevertebral", {
    x: 5.2, y: 2.8, w: 4.4, h: 1.1, fontSize: 12, color: C.white, valign: "top"
  });

  // Key exam points
  slide.addShape(pres.ShapeType.rect, { x: 0.3, y: 4.1, w: 9.4, h: 1.4, fill: { color: "0B3D2E" }, line: { color: C.accent, w: 1.2 } });
  slide.addText("★  High-Yield Exam Points", { x: 0.5, y: 4.14, w: 9, h: 0.35, fontSize: 14, bold: true, color: C.accent });
  slide.addText([
    { text: "• ", options: { bold: true, color: C.accent } },
    { text: "Danger space extends skull base → DIAPHRAGM (not just mediastinum)    ", options: { color: C.white } },
    { text: "• ", options: { bold: true, color: C.accent } },
    { text: "Retropharyngeal space → tracheal bifurcation    ", options: { color: C.white } },
    { text: "• ", options: { bold: true, color: C.accent } },
    { text: "Prevertebral space → coccyx\n", options: { color: C.white } },
    { text: "• ", options: { bold: true, color: C.accent } },
    { text: "Investing layer = ALL cervical nodal stations    ", options: { color: C.white } },
    { text: "• ", options: { bold: true, color: C.accent } },
    { text: "Pretracheal fascia → fibrous pericardium (Hamman's sign in chest)    ", options: { color: C.white } },
    { text: "• ", options: { bold: true, color: C.accent } },
    { text: "Stylomandibular ligament from investing fascia separates parapharyngeal & submandibular spaces", options: { color: C.white } },
  ], { x: 0.5, y: 4.5, w: 9, h: 0.9, fontSize: 11, valign: "top" });
}

// ============================================================
// SLIDE 12 — Thank You
// ============================================================
{
  const slide = pres.addSlide();
  bgRect(slide, C.navy);
  slide.addShape(pres.ShapeType.rect, { x: 0, y: 3.8, w: "100%", h: 1.825, fill: { color: C.teal }, line: { type: "none" } });
  slide.addShape(pres.ShapeType.rect, { x: 0, y: 3.8, w: "100%", h: 0.1, fill: { color: C.accent }, line: { type: "none" } });
  slide.addShape(pres.ShapeType.rect, { x: 4.9, y: 0, w: 0.12, h: "100%", fill: { color: C.accent }, line: { type: "none" } });

  slide.addText("Thank You!", {
    x: 0.5, y: 0.8, w: 9, h: 1.2,
    fontSize: 52, bold: true, color: C.white, align: "center", fontFace: "Calibri Light"
  });
  slide.addText("Questions & Discussion", {
    x: 0.5, y: 2.1, w: 9, h: 0.6,
    fontSize: 22, italic: true, color: "BDD9F0", align: "center"
  });
  slide.addShape(pres.ShapeType.rect, { x: 3, y: 2.78, w: 4, h: 0.07, fill: { color: C.accent }, line: { type: "none" } });

  slide.addText("Deep Cervical Fascia — 1st BHMS Anatomy", {
    x: 0, y: 3.9, w: "100%", h: 0.5,
    fontSize: 16, bold: true, color: C.white, align: "center", valign: "middle"
  });
  slide.addText("Source: Scott-Brown's Otorhinolaryngology Head & Neck Surgery  |  KJ Lee's Essential Otolaryngology  |  Fischer's Mastery of Surgery", {
    x: 0, y: 4.45, w: "100%", h: 0.4,
    fontSize: 10, italic: true, color: "BDD9F0", align: "center", valign: "middle"
  });
  slide.addText("\"The fascial planes of the neck form dissection tunnels which can be followed to surgically unlock the neck.\"", {
    x: 0.5, y: 5.0, w: 9, h: 0.45,
    fontSize: 11, italic: true, color: "BDD9F0", align: "center"
  });
}

// ============================================================
// WRITE FILE
// ============================================================
const outPath = "/home/daytona/workspace/deep-cervical-fascia-ppt/Deep_Cervical_Fascia_1BHMS.pptx";
pres.writeFile({ fileName: outPath }).then(() => {
  console.log("PPT created:", outPath);
}).catch(err => {
  console.error("Error:", err);
  process.exit(1);
});