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

// ── colour palette ──────────────────────────────────────────────────────────
const C = {
  navy:    "0D1B2A",  // dominant dark background
  teal:    "1A6B72",  // section headers / accents
  tealLt:  "2AABB5",  // bullet accent / lines
  gold:    "D4A843",  // highlight / callout
  offWht:  "F0F4F8",  // body text on dark
  white:   "FFFFFF",
  slate:   "1E2D3D",  // dark content background
  slateL:  "2C3E50",  // card backgrounds
  red:     "C0392B",
  green:   "27AE60",
  grey:    "7F8C8D",
};

// ── image URLs to prefetch ──────────────────────────────────────────────────
const IMG_URLS = [
  // retroperitoneal anatomy diagram
  "https://www.researchgate.net/publication/344317555/figure/fig1/AS:941404612218880@1601459758428/Schematic-diagram-of-retroperitoneal-anatomy-with-CT-correlation-The-anterior-pararenal.jpg",
  // liposarcoma CT
  "https://www.mdpi.com/cancers/cancers-15-02985/article_deploy/html/images/cancers-15-02985-g001.png",
  // CT/MRI imaging guide
  "https://www.mdpi.com/cancers/cancers-15-02985/article_deploy/html/images/cancers-15-02985-g008.png",
  // STS taxonomy radial diagram (from Sabiston)
  "https://cdn.orris.care/cdss_images/4d1e36ff6839679a18eac5891a5067a903add49223979e96a242a908c196196e.png",
  // CT showing dediff liposarcoma / post-RT (Sabiston fig 64.5)
  "https://cdn.orris.care/cdss_images/92bdfeaa67fa336f3366d2da3f2d9a4eaef255a4600d2cef2449eb2a0a4b1bb7.png",
  // Schwartz fig 36-9: large right dediff liposarcoma CT
  "https://cdn.orris.care/cdss_images/b0882ce14eb6ea764a29b62680f86aabbab1f4959907589f6c302fd8fdae703d.png",
];

console.log("Fetching images...");
let imgs;
try {
  const raw = execSync(
    `node /home/daytona/skills/shared/scripts/fetch_images.js ${IMG_URLS.map(u => `"${u}"`).join(" ")}`,
    { maxBuffer: 50 * 1024 * 1024 }
  ).toString();
  imgs = JSON.parse(raw);
} catch (e) {
  console.error("Image fetch failed:", e.message);
  imgs = IMG_URLS.map(() => ({ base64: null, error: "fetch failed" }));
}

// Helper: get base64 or null
function imgData(idx) {
  if (imgs[idx] && !imgs[idx].error && imgs[idx].base64) return imgs[idx].base64;
  return null;
}

// ── pptx setup ──────────────────────────────────────────────────────────────
const pres = new pptxgen();
pres.layout = "LAYOUT_16x9";
pres.title = "Retroperitoneal Tumors – Surgical Perspective";
pres.author = "Orris Medical Education";

// ── helper functions ─────────────────────────────────────────────────────────
function addSlide() { return pres.addSlide(); }

function darkBg(slide, accent) {
  slide.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:5.625, fill:{color: C.navy}, line:{color: C.navy} });
  if (accent !== false) {
    slide.addShape(pres.ShapeType.rect, { x:0, y:0, w:0.06, h:5.625, fill:{color: C.tealLt}, line:{color: C.tealLt} });
  }
}

function slateBg(slide) {
  slide.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:5.625, fill:{color: C.slate}, line:{color: C.slate} });
  slide.addShape(pres.ShapeType.rect, { x:0, y:0, w:0.06, h:5.625, fill:{color: C.gold}, line:{color: C.gold} });
}

function header(slide, text, y=0.18, color=C.tealLt) {
  slide.addText(text.toUpperCase(), {
    x:0.2, y, w:9.6, h:0.5, fontSize:11, bold:true, charSpacing:3,
    color, fontFace:"Calibri", align:"left", margin:0
  });
}

function sectionBar(slide, text, y=0.72) {
  slide.addShape(pres.ShapeType.rect, { x:0.2, y, w:9.6, h:0.05, fill:{color: C.tealLt}, line:{color: C.tealLt} });
  slide.addText(text, {
    x:0.2, y: y+0.08, w:9.6, h:0.5, fontSize:20, bold:true, color: C.white, fontFace:"Calibri", align:"left", margin:0
  });
}

function bullets(slide, items, x, y, w, h, opts={}) {
  const baseOpts = { fontSize:13, color: C.offWht, fontFace:"Calibri", ...opts };
  slide.addText(
    items.map((item, i) => ({
      text: item,
      options: { bullet:{type:"bullet", characterCode:"25CF", color: C.tealLt}, breakLine: i < items.length-1, ...baseOpts }
    })),
    { x, y, w, h, valign:"top", margin:0 }
  );
}

function card(slide, x, y, w, h, color=C.slateL) {
  slide.addShape(pres.ShapeType.roundRect, { x, y, w, h,
    fill:{color}, line:{color: C.tealLt, width:1}, rectRadius:0.08 });
}

function badge(slide, text, x, y, w=2.2, h=0.38, bg=C.teal) {
  slide.addShape(pres.ShapeType.roundRect, { x, y, w, h, fill:{color:bg}, line:{color:bg}, rectRadius:0.1 });
  slide.addText(text, { x, y, w, h, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"center", valign:"middle", margin:0 });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 1 – TITLE
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  // full dark background with gradient feel via shapes
  s.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:5.625, fill:{color:C.navy}, line:{color:C.navy} });
  s.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:1.8, fill:{color:C.teal}, line:{color:C.teal} });
  s.addShape(pres.ShapeType.rect, { x:0, y:1.8, w:10, h:0.06, fill:{color:C.gold}, line:{color:C.gold} });

  s.addText("RETROPERITONEAL TUMORS", {
    x:0.4, y:0.25, w:9.2, h:0.8, fontSize:32, bold:true, charSpacing:4,
    color:C.white, fontFace:"Calibri", align:"center", margin:0
  });
  s.addText("A Surgical Perspective", {
    x:0.4, y:1.1, w:9.2, h:0.55, fontSize:18, italic:true,
    color:C.offWht, fontFace:"Calibri", align:"center", margin:0
  });

  // key stats row
  const stats = [
    ["~1,000", "New US Cases/Year"],
    ["10-15%", "of All Adult Sarcomas"],
    ["70%", ">10 cm at Diagnosis"],
    ["33-39%", "5-Year Survival"],
  ];
  stats.forEach(([val, lbl], i) => {
    const xp = 0.5 + i*2.35;
    card(s, xp, 2.1, 2.1, 1.3, C.slateL);
    s.addText(val, { x:xp, y:2.15, w:2.1, h:0.6, fontSize:22, bold:true, color:C.gold, fontFace:"Calibri", align:"center", margin:0 });
    s.addText(lbl, { x:xp, y:2.75, w:2.1, h:0.55, fontSize:10, color:C.offWht, fontFace:"Calibri", align:"center", margin:0 });
  });

  s.addText("Sources: Schwartz's Principles of Surgery (11th ed.) | Sabiston Textbook of Surgery | Bailey & Love's (28th ed.)", {
    x:0.2, y:4.8, w:9.6, h:0.4, fontSize:8, color:C.grey, fontFace:"Calibri", align:"center", margin:0
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 2 – ANATOMY OF THE RETROPERITONEUM
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  darkBg(s);
  header(s, "Anatomy of the Retroperitoneum");
  sectionBar(s, "Anatomical Compartments", 0.72);

  const compartments = [
    ["Anterior Pararenal Space", "Between posterior parietal peritoneum & anterior renal fascia\nContains: pancreas, duodenum, ascending & descending colon"],
    ["Perirenal Space", "Between anterior & posterior layers of renal (Gerota's) fascia\nContains: kidneys, adrenals, proximal ureters, perinephric fat"],
    ["Posterior Pararenal Space", "Between posterior renal fascia & transversalis fascia\nContains: fat only (potential space for spread)"],
  ];
  compartments.forEach(([title, body], i) => {
    const yp = 1.4 + i*1.32;
    card(s, 0.2, yp, 5.5, 1.18, C.slateL);
    s.addText(title, { x:0.35, y:yp+0.05, w:5.2, h:0.38, fontSize:13, bold:true, color:C.tealLt, fontFace:"Calibri", align:"left", margin:0 });
    s.addText(body, { x:0.35, y:yp+0.42, w:5.2, h:0.68, fontSize:11, color:C.offWht, fontFace:"Calibri", align:"left", margin:0 });
  });

  // anatomy image
  const anat = imgData(0);
  if (anat) {
    s.addImage({ data: anat, x:5.85, y:1.3, w:3.9, h:3.8 });
    s.addText("Retroperitoneal anatomy with CT correlation", {
      x:5.85, y:5.1, w:3.9, h:0.35, fontSize:8, italic:true, color:C.grey, fontFace:"Calibri", align:"center", margin:0
    });
  }
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 3 – CLASSIFICATION
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  slateBg(s);
  header(s, "Classification of Retroperitoneal Tumors", 0.18, C.gold);
  sectionBar(s, "Tissue of Origin", 0.72);

  const groups = [
    { label:"Mesenchymal", color:C.teal, items:["Liposarcoma (most common)", "Leiomyosarcoma", "Undifferentiated Pleomorphic Sarcoma", "Fibrosarcoma, Angiosarcoma"] },
    { label:"Neurogenic", color:"5B4F8E", items:["Ganglioneuroma", "Neuroblastoma", "Paraganglioma", "Schwannoma"] },
    { label:"Germ Cell", color:"8E4F6B", items:["Teratoma", "Seminoma", "Non-seminomatous GCT"] },
    { label:"Lymphoid", color:"2E7D6B", items:["Lymphoma (Hodgkin/NHL)", "Castleman's disease"] },
    { label:"Cystic / Benign", color:"5E6B2E", items:["Bronchogenic cyst", "Lymphangioma", "Mature teratoma", "Lipoma"] },
  ];

  groups.forEach((g, i) => {
    const col = i < 3 ? 0 : 1;
    const row = i < 3 ? i : i-3;
    const xp = col === 0 ? 0.2 : 5.15;
    const yp = 1.38 + row * 1.35;
    const w = 4.75;
    card(s, xp, yp, w, 1.22, C.navy);
    badge(s, g.label, xp+0.1, yp+0.05, w-0.2, 0.32, g.color);
    s.addText(
      g.items.map((item, j) => ({ text: item, options: { bullet:{type:"bullet", characterCode:"2022", color:C.tealLt}, breakLine: j<g.items.length-1, fontSize:11, color:C.offWht, fontFace:"Calibri" } })),
      { x:xp+0.15, y:yp+0.42, w:w-0.25, h:0.72, valign:"top", margin:0 }
    );
  });

  // STS taxonomy image
  const tax = imgData(3);
  if (tax) {
    s.addImage({ data: tax, x:5.15, y:2.7, w:4.75, h:2.6 });
    s.addText("WHO STS taxonomy – Sabiston Textbook of Surgery", {
      x:5.15, y:5.28, w:4.75, h:0.28, fontSize:7.5, italic:true, color:C.grey, fontFace:"Calibri", align:"center", margin:0
    });
  }
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 4 – EPIDEMIOLOGY
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  darkBg(s);
  header(s, "Epidemiology");
  sectionBar(s, "Who Gets Retroperitoneal Tumors?", 0.72);

  const facts = [
    ["Incidence", "~1,000 new RPS cases per year in the USA\n1–2% of all solid malignancies; 10–15% of adult STS"],
    ["Peak Age", "Fifth decade of life (average 54 years)\nEqual male-to-female distribution"],
    ["Malignant Rate", "Most retroperitoneal masses are malignant\n~1/3 are soft tissue sarcomas"],
    ["Histology", "Liposarcoma + Leiomyosarcoma = majority\n~2/3 are high grade (Grade 2 or 3)"],
    ["Size at Presentation", "Average tumour size: 15 cm\n70% are >10 cm at diagnosis"],
    ["Metastases at Dx", "~12% present with synchronous metastases\n(predominantly pulmonary or hepatic)"],
  ];

  facts.forEach(([title, body], i) => {
    const col = i % 3;
    const row = Math.floor(i / 3);
    const xp = 0.2 + col*3.25;
    const yp = 1.42 + row*1.85;
    card(s, xp, yp, 3.1, 1.7, C.slateL);
    s.addText(title, { x:xp+0.12, y:yp+0.08, w:2.86, h:0.38, fontSize:12, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
    s.addText(body, { x:xp+0.12, y:yp+0.48, w:2.86, h:1.1, fontSize:11, color:C.offWht, fontFace:"Calibri", margin:0 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 5 – CLINICAL PRESENTATION
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  slateBg(s);
  header(s, "Clinical Presentation", 0.18, C.gold);
  sectionBar(s, "Signs & Symptoms", 0.72);

  // left col
  card(s, 0.2, 1.38, 4.6, 3.8, C.navy);
  s.addText("Symptoms (non-specific, late presentation)", { x:0.35, y:1.48, w:4.3, h:0.38, fontSize:12, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });
  bullets(s, [
    "Abdominal pain or fullness",
    "Back or flank pain",
    "Paresthesias / lower limb weakness",
    "Early satiety, nausea, vomiting",
    "Obstructive GI / urinary symptoms",
    "Weight loss",
    "Often asymptomatic – incidental finding",
  ], 0.35, 1.9, 4.3, 3.1, { fontSize:12 });

  // right col
  card(s, 5.0, 1.38, 4.8, 1.8, C.navy);
  s.addText("Red-Flag Features Suggesting Alternative Dx", { x:5.15, y:1.48, w:4.5, h:0.38, fontSize:12, bold:true, color:C.red, fontFace:"Calibri", margin:0 });
  bullets(s, [
    "Fever + night sweats → Lymphoma",
    "Elevated LDH → Lymphoma",
    "Elevated β-hCG / AFP → Germ Cell Tumor",
    "Testicular mass (check in all men)",
  ], 5.15, 1.9, 4.5, 1.2, { fontSize:11 });

  card(s, 5.0, 3.35, 4.8, 1.88, C.navy);
  s.addText("Why Do Patients Present Late?", { x:5.15, y:3.45, w:4.5, h:0.38, fontSize:12, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
  s.addText("The retroperitoneum is a large potential space – tumours can grow to enormous size before displacing viscera enough to cause symptoms. Symptoms are often non-specific and easily dismissed.", {
    x:5.15, y:3.87, w:4.5, h:1.2, fontSize:11, color:C.offWht, fontFace:"Calibri", margin:0
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 6 – DIFFERENTIAL DIAGNOSIS
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  darkBg(s);
  header(s, "Differential Diagnosis");
  sectionBar(s, "Retroperitoneal Mass – Key Differentials", 0.72);

  const ddx = [
    { title:"Primary Retroperitoneal Sarcoma", pts:["Liposarcoma (most common)", "Leiomyosarcoma", "UPS, Fibrosarcoma"], color:C.teal },
    { title:"Lymphoma", pts:["Hodgkin / Non-Hodgkin", "Elevated LDH, B-symptoms", "Multiple nodal stations"], color:"5B4F8E" },
    { title:"Germ Cell Tumor", pts:["Primary retroperitoneal GCT", "Metastatic testicular cancer", "Elevated β-hCG / AFP"], color:"8E4F6B" },
    { title:"Secondary / Metastatic", pts:["Nodal metastases from GI, GU, GYN", "Direct invasion from adjacent organs"], color:"7D3C98" },
    { title:"Benign Retroperitoneal Masses", pts:["Lipoma, Ganglioneuroma", "Paraganglioma, Schwannoma", "Lymphangioma, Cysts"], color:C.green },
    { title:"Retroperitoneal Fibrosis", pts:["Inflammatory / idiopathic", "Associated with IgG4 disease", "Periaortic soft tissue"], color:"A04000" },
  ];

  ddx.forEach((d, i) => {
    const col = i % 3;
    const row = Math.floor(i / 3);
    const xp = 0.2 + col*3.25;
    const yp = 1.42 + row*1.9;
    card(s, xp, yp, 3.1, 1.78, C.slateL);
    badge(s, "", xp, yp, 3.1, 0.35, d.color);
    s.addText(d.title, { x:xp+0.1, y:yp+0.03, w:2.9, h:0.3, fontSize:11, bold:true, color:C.white, fontFace:"Calibri", align:"left", margin:0 });
    bullets(s, d.pts, xp+0.1, yp+0.42, 2.9, 1.25, { fontSize:10.5 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 7 – INVESTIGATIONS / IMAGING
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  slateBg(s);
  header(s, "Investigations", 0.18, C.gold);
  sectionBar(s, "Workup of a Retroperitoneal Mass", 0.72);

  // imaging column
  card(s, 0.2, 1.38, 5.5, 3.92, C.navy);
  s.addText("Imaging", { x:0.35, y:1.48, w:5.2, h:0.4, fontSize:14, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });
  bullets(s, [
    "CT Abdomen/Pelvis (contrast) – FIRST LINE\n  → Extent, relationship to vessels, staging liver/peritoneum",
    "CT Chest – evaluate for lung metastases (11% synchronous)\n  → Standard in all RPS work-up",
    "MRI – superior soft-tissue contrast; assess vascular invasion\n  → Complements CT in complex cases",
    "Angiography / MR Arteriography – if major vessel involvement suspected\n  → Plan vascular reconstruction",
    "PET-CT – limited routine role; useful for high-grade or recurrence",
  ], 0.35, 1.95, 5.1, 3.25, { fontSize:11 });

  // right panel
  card(s, 5.85, 1.38, 3.9, 1.78, C.navy);
  s.addText("Laboratory", { x:6.0, y:1.48, w:3.6, h:0.35, fontSize:13, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });
  bullets(s, ["LDH (↑ → lymphoma)", "β-hCG, AFP (→ GCT)", "FBC, metabolic panel", "Renal function (pre-op)"], 6.0, 1.88, 3.6, 1.2, { fontSize:11.5 });

  card(s, 5.85, 3.28, 3.9, 2.02, C.navy);
  s.addText("Biopsy", { x:6.0, y:3.38, w:3.6, h:0.35, fontSize:13, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
  bullets(s, [
    "CT-guided core needle biopsy – recommended",
    "Needle-tract seeding risk: LOW",
    "Well-diff liposarcoma: CT diagnosis alone may suffice",
    "Negative biopsy ≠ delay surgery if imaging is diagnostic",
  ], 6.0, 3.78, 3.6, 1.42, { fontSize:10.5 });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 8 – IMAGING: CT / MRI FEATURES
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  darkBg(s);
  header(s, "Imaging Features");
  sectionBar(s, "CT & MRI Characteristics by Subtype", 0.72);

  // CT liposarcoma image
  const ctImg = imgData(1);
  if (ctImg) {
    s.addImage({ data: ctImg, x:0.2, y:1.38, w:4.5, h:3.6 });
    s.addText("Fig: Retroperitoneal liposarcoma – axial & sagittal CT (MDPI Cancers 2023)", {
      x:0.2, y:4.98, w:4.5, h:0.35, fontSize:7.5, italic:true, color:C.grey, fontFace:"Calibri", align:"center", margin:0
    });
  } else {
    card(s, 0.2, 1.38, 4.5, 3.6, C.slateL);
    s.addText("[CT Image: Retroperitoneal Liposarcoma]", { x:0.2, y:3.0, w:4.5, h:0.5, fontSize:12, italic:true, color:C.grey, fontFace:"Calibri", align:"center", margin:0 });
  }

  // Table on right
  s.addText("Imaging Characteristics", { x:4.9, y:1.38, w:4.9, h:0.4, fontSize:14, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });

  const rows = [
    ["Well-diff Liposarcoma", ">75% fat density; thick septa >2mm; non-adip areas"],
    ["Dediff Liposarcoma", "Fatty mass + non-fatty nodule; calcification possible"],
    ["Leiomyosarcoma", "IVC or renal vein origin; heterogeneous; necrosis"],
    ["GIST", "Smooth, hypervascular; arise from bowel wall"],
    ["Lymphoma", "Multiple enlarged nodes; homogeneous; LAD chains"],
    ["Paraganglioma", "Highly vascular; near aorta/IVC or adrenal"],
  ];

  const tableY = 1.88;
  s.addText("Subtype", { x:4.9, y:tableY, w:2.0, h:0.36, fontSize:11, bold:true, color:C.gold, fontFace:"Calibri", margin:4 });
  s.addText("CT/MRI Findings", { x:6.9, y:tableY, w:3.8, h:0.36, fontSize:11, bold:true, color:C.gold, fontFace:"Calibri", margin:4 });
  s.addShape(pres.ShapeType.rect, { x:4.9, y:tableY+0.38, w:9.2-4.9, h:0.03, fill:{color:C.tealLt}, line:{color:C.tealLt} });

  rows.forEach((row, i) => {
    const bg = i % 2 === 0 ? C.slateL : C.navy;
    const yRow = tableY + 0.45 + i*0.54;
    s.addShape(pres.ShapeType.rect, { x:4.9, y:yRow, w:9.2-4.9, h:0.52, fill:{color:bg}, line:{color:bg} });
    s.addText(row[0], { x:4.95, y:yRow+0.04, w:1.9, h:0.44, fontSize:10, bold:true, color:C.tealLt, fontFace:"Calibri", valign:"middle", margin:2 });
    s.addText(row[1], { x:6.88, y:yRow+0.04, w:3.7, h:0.44, fontSize:10, color:C.offWht, fontFace:"Calibri", valign:"middle", margin:2 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 9 – STAGING
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  slateBg(s);
  header(s, "Staging", 0.18, C.gold);
  sectionBar(s, "AJCC 8th Edition – Retroperitoneum", 0.72);

  // T stage
  card(s, 0.2, 1.38, 4.7, 2.4, C.navy);
  s.addText("T – Primary Tumor Size", { x:0.35, y:1.48, w:4.4, h:0.38, fontSize:13, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });
  const tStages = [["T1","≤5 cm"],["T2",">5 to ≤10 cm"],["T3",">10 to ≤15 cm"],["T4",">15 cm"]];
  tStages.forEach(([t, desc], i) => {
    const yp = 1.93 + i*0.43;
    badge(s, t, 0.35, yp, 0.6, 0.34, C.teal);
    s.addText(desc, { x:1.05, y:yp, w:3.6, h:0.34, fontSize:12, color:C.offWht, fontFace:"Calibri", valign:"middle", margin:0 });
  });

  // N/M/Grade
  card(s, 5.1, 1.38, 4.7, 2.4, C.navy);
  s.addText("N / M / Grade", { x:5.25, y:1.48, w:4.4, h:0.38, fontSize:13, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });
  bullets(s, [
    "N0: No regional nodes  |  N1: Regional nodal involvement",
    "M0: No distant mets  |  M1: Distant metastases",
    "Grade (G1–G3) is a major prognostic determinant",
    "Nodal mets (2–10%) – angiosarcoma, RMS, UPS highest risk",
    "N1 = Stage IV (same prognosis as M1 disease)",
  ], 5.25, 1.93, 4.4, 1.78, { fontSize:11.5 });

  // Histologic prognostic groups
  card(s, 0.2, 3.92, 9.6, 1.4, C.navy);
  s.addText("Histologic Prognostic Groups (Anaya classification)", { x:0.35, y:4.0, w:9.3, h:0.38, fontSize:12, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
  const hgs = [["Favourable","Well-differentiated liposarcoma\n(may be cured by resection)"],["Intermediate","Dediff / Pleomorphic liposarcoma"],["Poor","All other RPS histologic types\n(LMS, UPS, etc.)"]];
  hgs.forEach(([g, d], i) => {
    const clrs = [C.green, C.gold, C.red];
    const xp = 0.35 + i*3.15;
    badge(s, g, xp, 4.45, 1.5, 0.3, clrs[i]);
    s.addText(d, { x:xp+1.6, y:4.45, w:1.45, h:0.6, fontSize:9.5, color:C.offWht, fontFace:"Calibri", margin:0 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 10 – SURGICAL PRINCIPLES
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  darkBg(s);
  header(s, "Surgical Management – Principles");
  sectionBar(s, "Complete Surgical Resection: Gold Standard", 0.72);

  card(s, 0.2, 1.38, 9.6, 1.18, C.slateL);
  s.addText("Goal: Complete gross resection (R0/R1) – the ONLY potentially curative treatment for RPS.\nSurgery at high-volume specialist centres improves outcomes.", {
    x:0.4, y:1.48, w:9.2, h:0.95, fontSize:13, color:C.white, fontFace:"Calibri", margin:0
  });

  const pts = [
    ["Compartmental Resection", "En bloc removal of tumour with surrounding organs; avoid tumour rupture/fragmentation"],
    ["Multivisceral Resection", "≥75% cases require resection of ≥1 adjacent organ (kidney, colon, spleen, pancreas, small bowel)"],
    ["Vascular Resection", "IVC, aorta, renal vessels may require resection/reconstruction; patency >88% at 19 months"],
    ["Margin Status", "R0 microscopically clear; R1 microscopically involved; R2 macroscopic residual → worst outcomes"],
    ["Intraoperative Decisions", "Cannot reliably predict histologic invasion intra-op; err toward en bloc resection"],
    ["Palliative Resection", "Justified for atypical lipomatous tumours; NOT for high-grade dediff LPS or other high-grade RPS"],
  ];

  pts.forEach(([title, body], i) => {
    const col = i % 2;
    const row = Math.floor(i / 2);
    const xp = 0.2 + col*4.9;
    const yp = 2.68 + row*0.95;
    card(s, xp, yp, 4.75, 0.88, C.slateL);
    s.addText(title, { x:xp+0.12, y:yp+0.06, w:4.5, h:0.3, fontSize:11, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });
    s.addText(body, { x:xp+0.12, y:yp+0.4, w:4.5, h:0.42, fontSize:10.5, color:C.offWht, fontFace:"Calibri", margin:0 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 11 – SURGICAL TECHNIQUE & APPROACH
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  slateBg(s);
  header(s, "Surgical Technique", 0.18, C.gold);
  sectionBar(s, "Operative Approach & Considerations", 0.72);

  const left = [
    "Midline laparotomy – standard approach for most RPS",
    "Thoracoabdominal incision for large suprarenal tumours",
    "Medial visceral rotation (Mattox/Cattel-Braasch) to expose great vessels",
    "Early vessel control – identify and secure major vascular pedicles first",
    "Avoid tumour violation/spillage (capsule breach = worse local recurrence)",
    "Intraoperative frozen sections guide margins",
    "Left RPS: often involves left kidney, descending colon, tail of pancreas",
    "Right RPS: often involves right kidney, ascending colon, duodenum",
  ];
  card(s, 0.2, 1.38, 5.5, 3.95, C.navy);
  s.addText("Operative Steps & Tips", { x:0.35, y:1.48, w:5.2, h:0.38, fontSize:13, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });
  bullets(s, left, 0.35, 1.92, 5.1, 3.35, { fontSize:11.5 });

  const right = [
    ["Nephrectomy", "Most common organ sacrificed; performed prophylactically in contiguous LPS even without histologic invasion"],
    ["Colectomy", "Left/right hemicolectomy if bowel involved or at risk"],
    ["IVC Resection", "Feasible; may require reconstruction; ligation tolerated if collaterals adequate"],
    ["Pancreatic Resection", "Distal pancreatectomy for left-sided tumours; Whipple for proximal right-sided"],
  ];
  card(s, 5.9, 1.38, 3.9, 3.95, C.navy);
  s.addText("Organ Resections", { x:6.05, y:1.48, w:3.6, h:0.38, fontSize:13, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
  right.forEach(([org, desc], i) => {
    const yp = 1.95 + i*0.92;
    badge(s, org, 6.05, yp, 1.4, 0.3, C.teal);
    s.addText(desc, { x:6.05, y:yp+0.35, w:3.6, h:0.5, fontSize:10.5, color:C.offWht, fontFace:"Calibri", margin:0 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 12 – LIPOSARCOMA (most common)
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  darkBg(s);
  header(s, "Common Subtypes – Liposarcoma");
  sectionBar(s, "Most Common Retroperitoneal Sarcoma", 0.72);

  // CT image
  const ctRt = imgData(5);
  if (ctRt) {
    s.addImage({ data: ctRt, x:0.2, y:1.38, w:4.6, h:3.6 });
    s.addText("Fig: Right-sided dedifferentiated liposarcoma – CT (Schwartz Fig 36-9)", {
      x:0.2, y:4.98, w:4.6, h:0.3, fontSize:7.5, italic:true, color:C.grey, fontFace:"Calibri", align:"center", margin:0
    });
  } else {
    card(s, 0.2, 1.38, 4.6, 3.6, C.slateL);
    s.addText("[CT: Dediff Liposarcoma]", { x:0.2, y:3.0, w:4.6, h:0.5, fontSize:12, italic:true, color:C.grey, fontFace:"Calibri", align:"center", margin:0 });
  }

  const types = [
    { name:"Well-Differentiated (WDLPS)", color:C.green, pts:[
      "Low grade, rarely metastasises",
      ">75% fat; may be 'diagnosed' on CT",
      "Surgery often curative",
      "MDM2 amplification (12q13-15)",
    ]},
    { name:"Dedifferentiated (DDLPS)", color:C.red, pts:[
      "High grade; metastatic potential 15–20%",
      "Fatty mass + solid non-fatty nodule",
      "Calcification common",
      "Local recurrence dominant failure mode",
    ]},
    { name:"Myxoid / Round Cell", color:"8E44AD", pts:[
      "Intermediate–high grade",
      "t(12;16) DDIT3-FUS fusion",
      "Responds to trabectedin",
    ]},
  ];
  types.forEach((t, i) => {
    const yp = 1.38 + i*1.35;
    card(s, 5.0, yp, 4.8, 1.22, C.slateL);
    badge(s, t.name, 5.1, yp+0.06, 4.6, 0.3, t.color);
    bullets(s, t.pts, 5.1, yp+0.42, 4.6, 0.72, { fontSize:10.5 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 13 – LEIOMYOSARCOMA & OTHER SUBTYPES
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  slateBg(s);
  header(s, "Common Subtypes – Leiomyosarcoma & Others", 0.18, C.gold);
  sectionBar(s, "Key Histologic Subtypes", 0.72);

  const subtypes = [
    { name:"Leiomyosarcoma (LMS)", pts:[
      "Arise from IVC, renal vein, or retroperitoneal SM",
      "IVC-LMS: intraluminal growth → obstructive symptoms",
      "High local recurrence + hepatic/pulmonary metastases",
      "3-year overall survival ~50%",
    ], color:C.teal },
    { name:"Undifferentiated Pleomorphic Sarcoma", pts:[
      "Formerly MFH – a diagnosis of exclusion",
      "Highly aggressive; poor prognosis",
      "May respond to pembrolizumab (PD-1 inhibitor)",
    ], color:"7D3C98" },
    { name:"GIST (Gastrointestinal Stromal)", pts:[
      "Arise from interstitial cells of Cajal (ICCs)",
      "KIT (CD117) or PDGFRA mutation",
      "Imatinib: neoadjuvant to downstage prior to surgery",
      "Surgery ± adjuvant imatinib (3 years for high-risk)",
    ], color:"1A5276" },
    { name:"Paraganglioma", pts:[
      "Chromaffin + non-chromaffin varieties",
      "Functional: hypertension, headache, palpitations",
      "Pre-op alpha-blockade MANDATORY",
      "Resection is definitive; high cure rate",
    ], color:"784212" },
    { name:"Primary Retroperitoneal GCT", pts:[
      "Rare; AFP/β-hCG elevation",
      "Treat as metastatic testicular GCT (BEP chemo)",
      "Surgery for residual mass post-chemo",
    ], color:"1A6B72" },
    { name:"Lymphoma", pts:[
      "Non-surgical management (chemo/RT)",
      "Surgery role: diagnostic biopsy only",
      "Differentiating from sarcoma is critical",
    ], color:"2C3E50" },
  ];

  subtypes.forEach((st, i) => {
    const col = i % 3;
    const row = Math.floor(i / 3);
    const xp = 0.2 + col*3.25;
    const yp = 1.42 + row*1.9;
    card(s, xp, yp, 3.1, 1.78, C.navy);
    badge(s, st.name, xp+0.05, yp+0.05, 3.0, 0.3, st.color);
    bullets(s, st.pts, xp+0.1, yp+0.42, 2.9, 1.28, { fontSize:10.5 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 14 – NEOADJUVANT THERAPY
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  darkBg(s);
  header(s, "Neoadjuvant & Adjuvant Therapy");
  sectionBar(s, "Multimodality Treatment", 0.72);

  // Pre-op RT image
  const rtImg = imgData(4);
  if (rtImg) {
    s.addImage({ data: rtImg, x:0.2, y:1.38, w:4.5, h:3.1 });
    s.addText("Fig: RPS before (A) & after (B) 60-Gy pre-op RT – tumour liquefaction\n(Sabiston Textbook of Surgery, Fig 64.5)", {
      x:0.2, y:4.5, w:4.5, h:0.6, fontSize:8, italic:true, color:C.grey, fontFace:"Calibri", align:"center", margin:0
    });
  }

  card(s, 4.9, 1.38, 4.9, 1.55, C.slateL);
  s.addText("Neoadjuvant Radiation Therapy", { x:5.05, y:1.48, w:4.6, h:0.38, fontSize:13, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });
  bullets(s, [
    "Pre-op RT: tumour displaces bowel anteriorly – higher safe dose posteriorly",
    "45–50 Gy pre-op; tumour debulking aids dosing",
    "STRASS trial (EORTC): no OS/RFS benefit overall; subgroup signal in liposarcoma",
    "Recommended for large high-grade tumours at specialist centres",
  ], 5.05, 1.93, 4.6, 0.92, { fontSize:11 });

  card(s, 4.9, 3.05, 4.9, 1.45, C.slateL);
  s.addText("Adjuvant Chemotherapy", { x:5.05, y:3.15, w:4.6, h:0.38, fontSize:13, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
  bullets(s, [
    "Most studies: NO survival benefit from adjuvant chemo",
    "Metastatic disease: anthracycline-based 1st line",
    "2nd line: gemcitabine + docetaxel",
    "Emerging: trabectedin, MDM2 antagonists, CDK4 inhibitors",
    "Pembrolizumab: promising in UPS / dediff LPS",
  ], 5.05, 3.6, 4.6, 0.82, { fontSize:11 });

  card(s, 4.9, 4.6, 4.9, 0.75, C.slateL);
  s.addText("Post-op RT: generally discouraged unless tumour bed is away from radiosensitive structures", {
    x:5.05, y:4.65, w:4.6, h:0.62, fontSize:11, color:C.offWht, fontFace:"Calibri", margin:0
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 15 – SURGICAL OUTCOMES & SURVIVAL
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  slateBg(s);
  header(s, "Surgical Outcomes", 0.18, C.gold);
  sectionBar(s, "Results of Resection", 0.72);

  // Key outcome stats
  const stats = [
    { val:"103 mo", lbl:"Median Survival\nComplete Resection", color:C.green },
    { val:"18 mo",  lbl:"Median Survival\nIncomplete/Observation", color:C.red },
    { val:"80%",    lbl:"R0/R1 Achieved\n(primary resection)", color:C.teal },
    { val:">70%",   lbl:"Relapse rate even\nafter optimal resection", color:"E67E22" },
  ];
  stats.forEach((st, i) => {
    card(s, 0.2+i*2.38, 1.38, 2.2, 1.8, C.navy);
    s.addText(st.val, { x:0.2+i*2.38, y:1.5, w:2.2, h:0.75, fontSize:28, bold:true, color:st.color, fontFace:"Calibri", align:"center", margin:0 });
    s.addText(st.lbl, { x:0.2+i*2.38, y:2.25, w:2.2, h:0.85, fontSize:11, color:C.offWht, fontFace:"Calibri", align:"center", margin:0 });
  });

  // Recurrence patterns
  card(s, 0.2, 3.3, 4.6, 2.0, C.navy);
  s.addText("Recurrence After Resection", { x:0.35, y:3.4, w:4.3, h:0.38, fontSize:13, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });
  bullets(s, [
    "Local recurrence: predominant failure pattern (tumour bed)",
    "LMS: also spreads to liver + lungs (haematogenous)",
    "Peritoneal sarcomatosis: diffuse peritoneal recurrence",
    "Complete gross resection at recurrence: 57% (1st), 33% (2nd), 14% (3rd)",
    "High-grade tumours: aggressive systemic biology limits re-resection benefit",
  ], 0.35, 3.85, 4.3, 1.38, { fontSize:11 });

  // Morbidity / Mortality
  card(s, 5.0, 3.3, 4.8, 2.0, C.navy);
  s.addText("Perioperative Outcomes", { x:5.15, y:3.4, w:4.5, h:0.38, fontSize:13, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
  bullets(s, [
    "Morbidity after vascular resection: ~36%",
    "Mortality after vascular resection: ~4%",
    "Major post-op complications do NOT reduce long-term survival",
    "Extended procedures (IVC, Whipple) feasible at high-volume centres",
    "Pancreaticoduodenectomy / major vascular resection → higher morbidity",
  ], 5.15, 3.85, 4.5, 1.38, { fontSize:11 });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 16 – RECURRENT RPS
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  darkBg(s);
  header(s, "Recurrent Retroperitoneal Sarcoma");
  sectionBar(s, "Management of Recurrence", 0.72);

  card(s, 0.2, 1.38, 9.6, 0.95, C.slateL);
  s.addText("RPS recurs more often than extremity/trunk STS. Management depends on histologic subtype, resectability, disease-free interval, and performance status.", {
    x:0.4, y:1.48, w:9.2, h:0.78, fontSize:12, color:C.white, fontFace:"Calibri", margin:0
  });

  const recs = [
    { title:"Re-resection Criteria", pts:[
      "Radiographic evidence of potential complete resection required",
      "Longer disease-free interval (>12 months) = better outcome",
      "Histologic subtype guides decision: LPS favours re-resection",
      "High-grade tumours: high systemic risk – multidisciplinary decision",
    ], color:C.teal },
    { title:"Atypical Lipomatous Tumour (ALT)", pts:[
      "Aggressive surgery (even incomplete) justified",
      "May provide symptom palliation and survival benefit",
      "Low metastatic risk – local disease dominates",
    ], color:C.green },
    { title:"Dediff LPS / Other High-Grade", pts:[
      "Palliative resection NOT generally justified",
      "High rates of distant metastasis limit benefit",
      "Systemic chemotherapy preferred approach",
      "Clinical trial enrollment encouraged",
    ], color:C.red },
    { title:"Sarcomatosis (Peritoneal Spread)", pts:[
      "Diffuse peritoneal recurrence – very poor prognosis",
      "HIPEC: investigational in selected centres",
      "Palliative systemic therapy standard",
    ], color:"8E4F6B" },
  ];

  recs.forEach((r, i) => {
    const col = i % 2;
    const row = Math.floor(i / 2);
    const xp = 0.2 + col*4.9;
    const yp = 2.45 + row*1.5;
    card(s, xp, yp, 4.75, 1.38, C.slateL);
    badge(s, r.title, xp+0.08, yp+0.06, 4.58, 0.3, r.color);
    bullets(s, r.pts, xp+0.12, yp+0.44, 4.42, 0.88, { fontSize:10.5 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 17 – SPECIAL TOPICS: VASCULAR INVOLVEMENT
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  slateBg(s);
  header(s, "Vascular Involvement", 0.18, C.gold);
  sectionBar(s, "IVC & Major Vessel Resection", 0.72);

  card(s, 0.2, 1.38, 9.6, 1.05, C.navy);
  s.addText("Vascular resection is the treatment of choice when sarcoma involves major retroperitoneal vessels. Patency rate >88% at median 19-month follow-up with acceptable morbidity/mortality.", {
    x:0.35, y:1.48, w:9.3, h:0.88, fontSize:12, color:C.white, fontFace:"Calibri", margin:0
  });

  const vascular = [
    { title:"IVC Involvement", pts:[
      "Most common major vessel involved",
      "Segment I (infrahepatic) – ligation may be tolerated",
      "Segment II (juxtarenal) – reconstruction often needed",
      "Segment III (suprarenal/suprahepatic) – most challenging",
      "PTFE graft or panel graft reconstruction",
    ], color:C.teal },
    { title:"Aortic Involvement", pts:[
      "Less common; en bloc resection with graft",
      "Pre-op planning with CT angiography",
      "Vascular surgery collaboration essential",
      "Supracoeliac clamping if needed",
    ], color:"A04000" },
    { title:"Renal Vessel Involvement", pts:[
      "Bilateral renal vessel involvement = contraindication to resection",
      "Proximal SMA involvement: relative contraindication",
      "Ipsilateral nephrectomy commonly required",
      "Preserve contralateral renal function",
    ], color:"7D3C98" },
    { title:"Contraindications to Resection", pts:[
      "Bilateral renal vascular involvement",
      "Proximal SMA / SMV encasement",
      "Unresectable peritoneal disease (sarcomatosis)",
      "Poor performance status / prohibitive surgical risk",
    ], color:C.red },
  ];

  vascular.forEach((v, i) => {
    const col = i % 2;
    const row = Math.floor(i / 2);
    const xp = 0.2 + col*4.9;
    const yp = 2.58 + row*1.55;
    card(s, xp, yp, 4.75, 1.42, C.navy);
    badge(s, v.title, xp+0.08, yp+0.06, 4.58, 0.3, v.color);
    bullets(s, v.pts, xp+0.12, yp+0.44, 4.42, 0.9, { fontSize:10.5 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 18 – PREOPERATIVE PLANNING & MDT
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  darkBg(s);
  header(s, "Pre-operative Planning & Multidisciplinary Team");
  sectionBar(s, "MDT Approach at High-Volume Centres", 0.72);

  const mdt = [
    { role:"Surgical Oncologist", icon:"🔪", pts:["Leads resection planning","Determines organ/vessel sacrifice","En bloc strategy"] },
    { role:"Radiologist", icon:"🖥", pts:["Multiplanar CT/MRI review","Vascular mapping","Guides biopsy"] },
    { role:"Vascular Surgeon", icon:"🫀", pts:["IVC / aortic reconstruction","Endovascular pre-op embolisation"] },
    { role:"Radiation Oncologist", icon:"☢", pts:["Pre-op RT planning (IMRT)","IORT where available"] },
    { role:"Medical Oncologist", icon:"💊", pts:["Neoadjuvant chemo protocols","Systemic therapy for metastases"] },
    { role:"Pathologist", icon:"🔬", pts:["Core biopsy interpretation","Intraoperative frozen section","Final margin assessment"] },
  ];

  mdt.forEach((m, i) => {
    const col = i % 3;
    const row = Math.floor(i / 3);
    const xp = 0.2 + col*3.25;
    const yp = 1.42 + row*1.95;
    card(s, xp, yp, 3.1, 1.82, C.slateL);
    s.addText(m.role, { x:xp+0.12, y:yp+0.08, w:2.86, h:0.38, fontSize:12, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
    bullets(s, m.pts, xp+0.12, yp+0.5, 2.86, 1.24, { fontSize:11 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 19 – FOLLOW-UP & SURVEILLANCE
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  slateBg(s);
  header(s, "Follow-Up & Surveillance", 0.18, C.gold);
  sectionBar(s, "Post-Resection Monitoring", 0.72);

  card(s, 0.2, 1.38, 5.5, 3.95, C.navy);
  s.addText("Surveillance Schedule", { x:0.35, y:1.48, w:5.2, h:0.38, fontSize:14, bold:true, color:C.tealLt, fontFace:"Calibri", margin:0 });

  const sched = [
    ["Year 1–2", "CT abdomen/pelvis + CT chest q3–4 months"],
    ["Year 3–5", "CT q6 months"],
    ["Year 5+", "Annual CT; MRI if recurrence suspected"],
    ["High-Grade", "More frequent imaging; consider PET-CT at recurrence"],
  ];
  sched.forEach(([period, detail], i) => {
    const yp = 1.95 + i*0.9;
    badge(s, period, 0.35, yp, 1.5, 0.32, C.teal);
    s.addText(detail, { x:1.95, y:yp, w:3.6, h:0.32, fontSize:11.5, color:C.offWht, fontFace:"Calibri", valign:"middle", margin:0 });
  });

  card(s, 0.2, 5.05, 5.5, 0.28, C.teal);
  s.addText("No randomised data on optimal surveillance intervals – institutional protocols vary", {
    x:0.35, y:5.07, w:5.2, h:0.22, fontSize:10, italic:true, color:C.white, fontFace:"Calibri", margin:0
  });

  card(s, 5.9, 1.38, 3.9, 3.95, C.navy);
  s.addText("What to Look For", { x:6.05, y:1.48, w:3.6, h:0.38, fontSize:14, bold:true, color:C.gold, fontFace:"Calibri", margin:0 });
  bullets(s, [
    "Local tumour bed recurrence",
    "Contralateral retroperitoneal recurrence",
    "Peritoneal implants / sarcomatosis",
    "Pulmonary metastases (LMS, UPS)",
    "Hepatic metastases (LMS)",
    "Anastomotic or reconstruction integrity",
    "New contralateral adrenal or renal lesion",
  ], 6.05, 1.95, 3.6, 3.3, { fontSize:12 });
}

// ════════════════════════════════════════════════════════════════════════════
//  SLIDE 20 – KEY TAKEAWAYS / SUMMARY
// ════════════════════════════════════════════════════════════════════════════
{
  const s = addSlide();
  // Full dark background with gold accent
  s.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:5.625, fill:{color:C.navy}, line:{color:C.navy} });
  s.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:1.0, fill:{color:C.teal}, line:{color:C.teal} });
  s.addShape(pres.ShapeType.rect, { x:0, y:1.0, w:10, h:0.06, fill:{color:C.gold}, line:{color:C.gold} });

  s.addText("KEY SURGICAL TAKEAWAYS", {
    x:0.4, y:0.15, w:9.2, h:0.7, fontSize:26, bold:true, charSpacing:4,
    color:C.white, fontFace:"Calibri", align:"center", margin:0
  });

  const keys = [
    ["1", "Most retroperitoneal masses are malignant; ~1/3 are soft tissue sarcomas"],
    ["2", "Liposarcoma + Leiomyosarcoma account for the majority of RPS"],
    ["3", "Complete surgical resection is the ONLY curative treatment – R0/R1 at high-volume centres"],
    ["4", "En bloc multivisceral resection in ≥75% of cases – kidney, colon, adrenal most common"],
    ["5", "Preoperative CT-guided biopsy guides neoadjuvant strategies and surgical planning"],
    ["6", "Neoadjuvant RT (45–50 Gy) considered for large high-grade tumours; no proven OS benefit"],
    ["7", "Local recurrence is the dominant failure pattern; re-resection selected cases"],
    ["8", "Adjuvant chemo has limited evidence; emerging role for immunotherapy (UPS, DDLPS)"],
    ["9", "MDT approach + referral to high-volume sarcoma centre is mandatory for optimal outcomes"],
  ];

  keys.forEach(([num, text], i) => {
    const col = i < 5 ? 0 : 1;
    const row = i < 5 ? i : i-5;
    const xp = col === 0 ? 0.2 : 5.15;
    const yp = 1.18 + row*0.86;
    card(s, xp, yp, 4.75, 0.78, C.slateL);
    badge(s, num, xp+0.1, yp+0.22, 0.4, 0.34, C.teal);
    s.addText(text, { x:xp+0.62, y:yp+0.1, w:4.0, h:0.58, fontSize:11, color:C.offWht, fontFace:"Calibri", valign:"middle", margin:0 });
  });

  s.addText("Sources: Schwartz's Principles of Surgery 11e | Sabiston Textbook of Surgery | Bailey & Love's 28e | Fischer's Mastery of Surgery 8e", {
    x:0.2, y:5.28, w:9.6, h:0.32, fontSize:8, color:C.grey, fontFace:"Calibri", align:"center", margin:0
  });
}

// ── write file ───────────────────────────────────────────────────────────────
const outPath = "/home/daytona/workspace/retroperitoneal-pptx/Retroperitoneal_Tumors_Surgical.pptx";
pres.writeFile({ fileName: outPath })
  .then(() => console.log("DONE:", outPath))
  .catch(e => { console.error(e); process.exit(1); });