from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.lib.units import mm, cm
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.enums import TA_LEFT, TA_CENTER, TA_JUSTIFY
from reportlab.platypus import (
    SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle,
    HRFlowable, Image, KeepTogether
)
from reportlab.platypus.flowables import Flowable
from reportlab.lib.colors import HexColor
import os

# ── Color Palette ────────────────────────────────────────────────────────────
DARK_BLUE    = HexColor('#1A2F5A')   # header / chapter titles
MID_BLUE     = HexColor('#2E5DA6')   # question number badge
ACCENT_BLUE  = HexColor('#3B82F6')   # option labels
ANSWER_GREEN = HexColor('#16A34A')   # "Answer:" label
SOL_ORANGE   = HexColor('#D97706')   # "Solution:" label / section headers
LIGHT_GREY   = HexColor('#F3F4F6')   # question background
KEY_YELLOW   = HexColor('#FEF9C3')   # key-point box background
KEY_BORDER   = HexColor('#CA8A04')   # key-point box border
TABLE_HEADER = HexColor('#1E3A5F')   # table header bg
TABLE_ROW1   = HexColor('#EFF6FF')   # table alternating row 1
TABLE_ROW2   = HexColor('#DBEAFE')   # table alternating row 2
TEXT_BLACK   = HexColor('#111827')
WHITE        = colors.white

PAGE_W, PAGE_H = A4
MARGIN = 1.8 * cm

# ── Document ─────────────────────────────────────────────────────────────────
OUTPUT = '/tmp/workspace/fmt-pdf/FMT_Questions_Explained.pdf'
doc = SimpleDocTemplate(
    OUTPUT,
    pagesize=A4,
    leftMargin=MARGIN, rightMargin=MARGIN,
    topMargin=2.2 * cm, bottomMargin=2 * cm,
)

# ── Styles ────────────────────────────────────────────────────────────────────
styles = getSampleStyleSheet()

def S(name, **kw):
    """Create a named ParagraphStyle inheriting from 'Normal'."""
    return ParagraphStyle(name, parent=styles['Normal'], **kw)

# base text
body        = S('body',        fontSize=10, leading=15, textColor=TEXT_BLACK,
                spaceBefore=2, spaceAfter=2, fontName='Helvetica',
                alignment=TA_JUSTIFY)
body_bold   = S('bodyBold',    fontSize=10, leading=15, textColor=TEXT_BLACK,
                fontName='Helvetica-Bold')
small       = S('small',       fontSize=9,  leading=13, textColor=TEXT_BLACK,
                fontName='Helvetica')

# chapter / section
chap_title  = S('chapTitle',   fontSize=15, leading=20,
                fontName='Helvetica-Bold', textColor=WHITE,
                alignment=TA_CENTER, spaceAfter=0)
chap_sub    = S('chapSub',     fontSize=9,  leading=12,
                fontName='Helvetica', textColor=HexColor('#BFD7FF'),
                alignment=TA_CENTER, spaceAfter=0)

# question stem
q_number    = S('qNumber',     fontSize=11, leading=14, textColor=WHITE,
                fontName='Helvetica-Bold', alignment=TA_CENTER)
q_stem      = S('qStem',       fontSize=10.5, leading=16, textColor=TEXT_BLACK,
                fontName='Helvetica', spaceAfter=6,
                firstLineIndent=0, leftIndent=0)

# options
opt_text    = S('optText',     fontSize=10, leading=15, textColor=TEXT_BLACK,
                fontName='Helvetica', leftIndent=28, spaceAfter=3)
correct_opt = S('correctOpt',  fontSize=10, leading=15,
                fontName='Helvetica-Bold', textColor=ANSWER_GREEN,
                leftIndent=28, spaceAfter=3)

# answer / solution labels
ans_label   = S('ansLabel',    fontSize=11, leading=14,
                fontName='Helvetica-Bold', textColor=ANSWER_GREEN,
                spaceBefore=6)
sol_label   = S('solLabel',    fontSize=11, leading=14,
                fontName='Helvetica-Bold', textColor=SOL_ORANGE,
                spaceBefore=4)
# explanation headings
exp_h1      = S('expH1',       fontSize=10.5, leading=14,
                fontName='Helvetica-Bold', textColor=DARK_BLUE,
                spaceBefore=8, spaceAfter=3,
                borderPad=0)
exp_h2      = S('expH2',       fontSize=10, leading=14,
                fontName='Helvetica-Bold', textColor=SOL_ORANGE,
                spaceBefore=6, spaceAfter=2)
bullet_item = S('bulletItem',  fontSize=10, leading=14, textColor=TEXT_BLACK,
                fontName='Helvetica', leftIndent=18,
                bulletIndent=6, spaceAfter=2)
sub_bullet  = S('subBullet',   fontSize=9.5, leading=13, textColor=TEXT_BLACK,
                fontName='Helvetica', leftIndent=34,
                bulletIndent=22, spaceAfter=1)
key_text    = S('keyText',     fontSize=10, leading=15, textColor=TEXT_BLACK,
                fontName='Helvetica', leftIndent=8, spaceAfter=2)
key_bold    = S('keyBold',     fontSize=10, leading=15,
                fontName='Helvetica-Bold', textColor=DARK_BLUE,
                leftIndent=8, spaceAfter=2)

# ── Helper Flowables ─────────────────────────────────────────────────────────
def chapter_header(ch_num, title, subtitle=''):
    """Blue banner for chapter title."""
    data = [[Paragraph(f'Chapter {ch_num}', chap_sub),
             Paragraph(title, chap_title)]]
    if subtitle:
        data[0].append(Paragraph(subtitle, chap_sub))
    tbl = Table([[Paragraph(f'Chapter {ch_num}  ·  {title}', chap_title)]],
                colWidths=[PAGE_W - 2 * MARGIN])
    tbl.setStyle(TableStyle([
        ('BACKGROUND', (0,0), (-1,-1), DARK_BLUE),
        ('BOX',        (0,0), (-1,-1), 1, MID_BLUE),
        ('TOPPADDING', (0,0), (-1,-1), 10),
        ('BOTTOMPADDING', (0,0), (-1,-1), 10),
        ('LEFTPADDING', (0,0), (-1,-1), 16),
        ('RIGHTPADDING', (0,0), (-1,-1), 16),
        ('ROUNDEDCORNERS', [4, 4, 4, 4]),
    ]))
    return [tbl, Spacer(1, 8)]

def question_block(q_num, stem, options, correct_letter):
    """Renders the question box."""
    W = PAGE_W - 2 * MARGIN
    badge = Table([[Paragraph(f'Q{q_num}', q_number)]],
                  colWidths=[32], rowHeights=[20])
    badge.setStyle(TableStyle([
        ('BACKGROUND', (0,0), (-1,-1), MID_BLUE),
        ('ROUNDEDCORNERS', [4, 4, 4, 4]),
        ('TOPPADDING',    (0,0), (-1,-1), 2),
        ('BOTTOMPADDING', (0,0), (-1,-1), 2),
    ]))

    stem_para = Paragraph(stem, q_stem)
    badge_stem = Table([[badge, stem_para]],
                       colWidths=[40, W - 40])
    badge_stem.setStyle(TableStyle([
        ('VALIGN', (0,0), (-1,-1), 'TOP'),
        ('TOPPADDING', (0,0), (-1,-1), 0),
        ('BOTTOMPADDING', (0,0), (-1,-1), 0),
        ('LEFTPADDING', (0,0), (-1,-1), 0),
        ('RIGHTPADDING', (0,0), (0,0), 8),
        ('RIGHTPADDING', (1,0), (1,0), 0),
    ]))

    opt_rows = []
    letters = ['A', 'B', 'C', 'D']
    for i, opt in enumerate(options):
        ltr = letters[i]
        is_correct = (ltr == correct_letter.upper())
        label_style = correct_opt if is_correct else opt_text
        tick = ' ✓' if is_correct else ''
        opt_para = Paragraph(
            f'<font color="{"#16A34A" if is_correct else "#2E5DA6"}"><b>{ltr}.</b></font> {opt}{tick}',
            label_style
        )
        opt_rows.append([opt_para])

    opts_table = Table(opt_rows, colWidths=[W - 20])
    opts_table.setStyle(TableStyle([
        ('TOPPADDING',    (0,0), (-1,-1), 2),
        ('BOTTOMPADDING', (0,0), (-1,-1), 2),
        ('LEFTPADDING',   (0,0), (-1,-1), 0),
        ('RIGHTPADDING',  (0,0), (-1,-1), 0),
    ]))

    full = Table([[badge_stem], [opts_table]],
                 colWidths=[W])
    full.setStyle(TableStyle([
        ('BACKGROUND',    (0,0), (-1,-1), LIGHT_GREY),
        ('BOX',           (0,0), (-1,-1), 0.8, HexColor('#CBD5E1')),
        ('ROUNDEDCORNERS', [6, 6, 6, 6]),
        ('TOPPADDING',    (0,0), (-1,-1), 10),
        ('BOTTOMPADDING', (0,0), (-1,-1), 8),
        ('LEFTPADDING',   (0,0), (-1,-1), 12),
        ('RIGHTPADDING',  (0,0), (-1,-1), 12),
        ('LINEBELOW',     (0,0), (0,0), 0.5, HexColor('#CBD5E1')),
    ]))
    return [KeepTogether([full, Spacer(1, 4)])]

def answer_line(letter, option_text):
    txt = f'Answer:  <font color="#16A34A"><b>{letter}. {option_text}</b></font>'
    return [Paragraph(txt, ans_label), Spacer(1, 2)]

def solution_header(tag='#ZVrecommended'):
    txt = f'Solution: <font color="#D97706"><b>{tag}</b></font>'
    return [Paragraph(txt, sol_label), Spacer(1, 4)]

def bullet(text, level=1):
    style = bullet_item if level == 1 else sub_bullet
    bullet_char = '•' if level == 1 else '–'
    return Paragraph(f'{bullet_char} {text}', style)

def arrow_bullet(left, right):
    """→ item with bold key → value."""
    return Paragraph(f'<b>→</b>  <b>{left}</b>  →  {right}', bullet_item)

def key_box(items):
    """Yellow highlighted key-facts box."""
    W = PAGE_W - 2 * MARGIN - 24
    rows = [[Paragraph('<b>Key Features</b>', exp_h1)]]
    for item in items:
        rows.append([Paragraph(f'<font color="#166534">✔</font>  {item}', key_text)])
    t = Table(rows, colWidths=[W])
    t.setStyle(TableStyle([
        ('BACKGROUND',    (0,0), (-1,-1), KEY_YELLOW),
        ('BOX',           (0,0), (-1,-1), 1, KEY_BORDER),
        ('ROUNDEDCORNERS',[4, 4, 4, 4]),
        ('TOPPADDING',    (0,0), (-1,-1), 6),
        ('BOTTOMPADDING', (0,0), (-1,-1), 6),
        ('LEFTPADDING',   (0,0), (-1,-1), 10),
        ('RIGHTPADDING',  (0,0), (-1,-1), 10),
        ('LINEBELOW',     (0,0), (0,0), 0.5, KEY_BORDER),
    ]))
    return [t, Spacer(1, 8)]

def section_divider(label):
    return [
        Spacer(1, 8),
        HRFlowable(width='100%', thickness=1, color=HexColor('#E2E8F0')),
        Spacer(1, 2),
    ]

# ── Build Story ───────────────────────────────────────────────────────────────
story = []

# ── PAGE HEADER ──
story += chapter_header(1, 'Skeletal & Dental Age Determination',
                        'Forensic Medicine | MARROW ED8 Pattern')
story.append(Spacer(1, 4))

# ════════════════════════════════════════════════════════
#  QUESTION 1
# ════════════════════════════════════════════════════════
story += question_block(
    1,
    ('A 28-year-old unidentified male victim is brought to the mortuary after a road traffic '
     'accident. During the medico-legal autopsy, the forensic expert examines the wrist X-ray '
     'and notes that the epiphysis of the distal radius shows a clearly visible radiolucent '
     'line (growth plate) but the epiphysis and the diaphysis are partially fused. '
     'Based on this finding, what is the most likely estimated age range of this individual?'),
    [
        '16 – 18 years',
        '18 – 20 years',
        '20 – 25 years',
        '25 – 30 years',
    ],
    correct_letter='B'
)

story += answer_line('B', '18 – 20 years')
story += solution_header('#ZVrecommended')

story.append(Paragraph('Core Concept: Epiphyseal Fusion at the Wrist', exp_h1))
story.append(Paragraph(
    'The distal radius is one of the most reliable sites for estimating skeletal age in young '
    'adults. Fusion occurs in a predictable sequence: first the epiphysis appears, then '
    'partial fusion begins, and finally complete (total) fusion is observed.',
    body))
story.append(Spacer(1, 6))

# ── X-ray image ──
img_path = '/tmp/workspace/fmt-pdf/bone_age_xray.jpg'
img = Image(img_path, width=9*cm, height=7*cm)
img.hAlign = 'CENTER'
img_cap = Paragraph(
    '<i>Figure 1: AP X-ray of both wrists showing fused distal radial and ulnar epiphyses '
    '(red arrows). Complete absence of growth plates → skeletal age ≥ 17 years.</i>',
    S('imgCap', fontSize=8.5, leading=12, textColor=HexColor('#475569'),
      alignment=TA_CENTER, fontName='Helvetica-Oblique'))
story += [img, img_cap, Spacer(1, 8)]

story.append(Paragraph('Epiphyseal Fusion Table – Distal Forearm', exp_h2))

# ── TABLE 1 ──
table1_data = [
    ['Bone / Site', 'Fusion Begins', 'Complete Fusion', 'Forensic Significance'],
    ['Distal Radius', '16–17 yrs', '18–20 yrs', 'Most reliable wrist landmark'],
    ['Distal Ulna', '16–18 yrs', '19–21 yrs', 'Used alongside radius'],
    ['Medial Clavicle', '18–20 yrs', '22–25 yrs', 'Last epiphysis to fuse (gold standard ≥ 21)'],
    ['Iliac Crest', '15–16 yrs', '22–25 yrs', 'Risser sign for spinal maturity'],
    ['Head of Femur', '14–16 yrs', '17–19 yrs', 'Used in hip fracture age estimation'],
]
t1_widths = [3.8*cm, 2.4*cm, 2.8*cm, 6*cm]
t1 = Table(table1_data, colWidths=t1_widths)
t1.setStyle(TableStyle([
    # header
    ('BACKGROUND',   (0,0), (-1,0),  TABLE_HEADER),
    ('TEXTCOLOR',    (0,0), (-1,0),  WHITE),
    ('FONTNAME',     (0,0), (-1,0),  'Helvetica-Bold'),
    ('FONTSIZE',     (0,0), (-1,0),  9),
    ('ALIGN',        (0,0), (-1,0),  'CENTER'),
    # body
    ('FONTNAME',     (0,1), (-1,-1), 'Helvetica'),
    ('FONTSIZE',     (0,1), (-1,-1), 9),
    ('ALIGN',        (1,1), (2,-1),  'CENTER'),
    ('ALIGN',        (0,1), (0,-1),  'LEFT'),
    ('ALIGN',        (3,1), (3,-1),  'LEFT'),
    # alternating rows
    ('BACKGROUND',   (0,1), (-1,1),  TABLE_ROW1),
    ('BACKGROUND',   (0,2), (-1,2),  TABLE_ROW2),
    ('BACKGROUND',   (0,3), (-1,3),  TABLE_ROW1),
    ('BACKGROUND',   (0,4), (-1,4),  TABLE_ROW2),
    ('BACKGROUND',   (0,5), (-1,5),  TABLE_ROW1),
    # grid
    ('GRID',         (0,0), (-1,-1), 0.5, HexColor('#CBD5E1')),
    ('BOX',          (0,0), (-1,-1), 1,   HexColor('#94A3B8')),
    ('TOPPADDING',   (0,0), (-1,-1), 5),
    ('BOTTOMPADDING',(0,0), (-1,-1), 5),
    ('LEFTPADDING',  (0,0), (-1,-1), 6),
    ('RIGHTPADDING', (0,0), (-1,-1), 6),
    ('VALIGN',       (0,0), (-1,-1), 'MIDDLE'),
]))
story.append(t1)
story.append(Spacer(1, 8))

story.append(Paragraph('Why Not Others?', exp_h2))
story += [
    bullet('<b>A. 16–18 years:</b> At this age, fusion has only just begun; a clearly visible '
           'radiolucent line with partial fusion indicates the process is underway, pointing '
           'to the 18–20 range.'),
    bullet('<b>C. 20–25 years:</b> By this age, the distal radius epiphysis is fully fused with '
           'no visible growth plate; partial fusion rules this out.'),
    bullet('<b>D. 25–30 years:</b> Well past the fusion window. No epiphyseal lines are visible '
           'in this age group at the wrist.'),
]
story.append(Spacer(1, 4))
story += key_box([
    'Partial (incomplete) fusion of distal radius epiphysis → 18–20 years',
    'Complete fusion of distal radius → 20+ years',
    'Medial clavicle is the LAST epiphysis to fuse (~25 years) – used to confirm age ≥21 years',
    'On X-ray: visible radiolucent growth plate line = fusion not yet complete',
])

story += section_divider('Q2')

# ════════════════════════════════════════════════════════
#  QUESTION 2
# ════════════════════════════════════════════════════════
story += question_block(
    2,
    ('A forensic odontologist is asked to estimate the age of an unknown deceased person. '
     'On dental examination, all four third molars are present, fully erupted, and show '
     'moderate attrition. The root formation of the third molars appears complete on OPG '
     '(orthopantomogram). Based solely on Gustafson\'s method, which of the following '
     'structural changes is NOT one of the six criteria used for dental age estimation?'),
    [
        'Attrition',
        'Cementum apposition',
        'Crown morphology changes',
        'Secondary dentine deposition',
    ],
    correct_letter='C'
)

story += answer_line('C', 'Crown morphology changes')
story += solution_header('#ZVrecommended')

story.append(Paragraph("Gustafson's Method of Dental Age Estimation", exp_h1))
story.append(Paragraph(
    "Gustafson (1950) described six age-related regressive changes that occur in teeth. "
    "Each criterion is graded from 0 to 3 (total score 0–18). Age is estimated from the "
    "regression formula: <b>Age = 11.43 + 4.56 × (total points)</b>. "
    "Crown morphology is NOT one of the six parameters.",
    body))
story.append(Spacer(1, 6))

# ── TABLE 2 – Gustafson's 6 criteria ──
story.append(Paragraph("Gustafson's Six Criteria – Summary Table", exp_h2))
table2_data = [
    ['Criterion', 'Abbreviation', 'What is Assessed', 'Grading (0–3)'],
    ['1. Attrition (A)',           'A', 'Wear of occlusal/incisal surface', '0 = none  → 3 = severe (into pulp)'],
    ['2. Periodontosis (P)',        'P', 'Periodontal attachment loss',       '0 = none  → 3 = >⅔ root length'],
    ['3. Secondary Dentine (S)',    'S', 'Pulp cavity reduction by reparative dentine', '0 = none  → 3 = complete obliteration'],
    ['4. Cementum Apposition (C)', 'C', 'Cementum layer thickness at root apex', '0 = none  → 3 = very thick'],
    ['5. Root Resorption (R)',      'R', 'Apical root resorption lacunae',    '0 = none  → 3 = extensive'],
    ['6. Root Transparency (T)',    'T', 'Translucency of root dentine (apical third)', '0 = none  → 3 = extends >⅔ root'],
    ['✗ Crown Morphology',         '—', 'NOT a Gustafson criterion',         'Excluded – answer C is correct'],
]
t2_widths = [3.5*cm, 2*cm, 6*cm, 3.5*cm]
t2 = Table(table2_data, colWidths=t2_widths)
t2.setStyle(TableStyle([
    ('BACKGROUND',   (0,0), (-1,0),  TABLE_HEADER),
    ('TEXTCOLOR',    (0,0), (-1,0),  WHITE),
    ('FONTNAME',     (0,0), (-1,0),  'Helvetica-Bold'),
    ('FONTSIZE',     (0,0), (-1,0),  9),
    ('ALIGN',        (0,0), (-1,0),  'CENTER'),
    ('FONTNAME',     (0,1), (-1,-1), 'Helvetica'),
    ('FONTSIZE',     (0,1), (-1,-1), 8.5),
    ('BACKGROUND',   (0,1), (-1,1),  TABLE_ROW1),
    ('BACKGROUND',   (0,2), (-1,2),  TABLE_ROW2),
    ('BACKGROUND',   (0,3), (-1,3),  TABLE_ROW1),
    ('BACKGROUND',   (0,4), (-1,4),  TABLE_ROW2),
    ('BACKGROUND',   (0,5), (-1,5),  TABLE_ROW1),
    ('BACKGROUND',   (0,6), (-1,6),  HexColor('#FEE2E2')),
    ('FONTNAME',     (0,6), (-1,6),  'Helvetica-Bold'),
    ('TEXTCOLOR',    (0,6), (-1,6),  HexColor('#991B1B')),
    ('GRID',         (0,0), (-1,-1), 0.5, HexColor('#CBD5E1')),
    ('BOX',          (0,0), (-1,-1), 1,   HexColor('#94A3B8')),
    ('TOPPADDING',   (0,0), (-1,-1), 4),
    ('BOTTOMPADDING',(0,0), (-1,-1), 4),
    ('LEFTPADDING',  (0,0), (-1,-1), 5),
    ('RIGHTPADDING', (0,0), (-1,-1), 5),
    ('VALIGN',       (0,0), (-1,-1), 'MIDDLE'),
]))
story.append(t2)
story.append(Spacer(1, 8))

story.append(Paragraph('Why Not Others?', exp_h2))
story += [
    bullet('<b>A. Attrition:</b> This IS criterion 1 in Gustafson\'s method. Graded 0–3 '
           'based on degree of occlusal wear.'),
    bullet('<b>B. Cementum apposition:</b> This IS criterion 4. Cementum deposition '
           'increases with age and is graded by layer thickness at the root apex.'),
    bullet('<b>D. Secondary dentine deposition:</b> This IS criterion 3. Reparative '
           'dentine progressively obliterates the pulp cavity with advancing age.'),
]
story.append(Spacer(1, 4))
story += key_box([
    "Mnemonic for Gustafson's 6 criteria: <b>A P S C R T</b>",
    'Attrition · Periodontosis · Secondary dentine · Cementum · Root resorption · Transparency',
    'Formula: Age = 11.43 + 4.56 × (sum of all 6 scores)',
    'Crown morphology is NOT included — this is a common exam trap',
])

story += section_divider('Q3')

# ════════════════════════════════════════════════════════
#  QUESTION 3
# ════════════════════════════════════════════════════════
story += question_block(
    3,
    ('A 35-year-old female is found dead in her apartment. The forensic pathologist needs '
     'to determine if she was of Indian origin. On examination of the pelvis, the following '
     'features are noted: sub-pubic angle is 80°, the sciatic notch is moderately wide, '
     'the sacrum is slightly curved, and the acetabulum is of medium size. '
     'What is the MOST LIKELY sex of this individual based purely on the pelvic findings?'),
    [
        'Male, because sub-pubic angle < 90° in males',
        'Female, because the sub-pubic angle in females is 80–85°',
        'Male, because a curved sacrum is exclusively seen in males',
        'Cannot determine from pelvic features alone',
    ],
    correct_letter='B'
)

story += answer_line('B', 'Female, because the sub-pubic angle in females is 80–85°')
story += solution_header('#ZVrecommended')

story.append(Paragraph('Pelvic Sex Determination in Forensics', exp_h1))
story.append(Paragraph(
    'The pelvis is the SINGLE MOST RELIABLE bone for sex determination in forensic anthropology. '
    'In males, the sub-pubic angle is typically <70° (narrow, arch-shaped), while in females '
    'it is wider (>80°, sometimes described as >90° in Caucasians, but 80–85° in Indian females). '
    'This question tests knowledge of Indian population norms.',
    body))
story.append(Spacer(1, 6))

story.append(Paragraph('Comparison of Male vs Female Pelvis – Key Differences', exp_h2))
table3_data = [
    ['Feature',              'Male Pelvis',             'Female Pelvis',          'Forensic Use'],
    ['Sub-pubic angle',      '<70° (arch)',             '80–90° (arch/angle)',    'Most reliable single feature'],
    ['Pelvic inlet',         'Heart-shaped (narrow)',   'Oval/round (wide)',      'Obstetric conjugate >11 cm in F'],
    ['Sciatic notch',        'Narrow (<68°)',           'Wide (>68°)',            'Graded I–V (Buikstra)'],
    ['Sacrum',               'Long, narrow, curved',   'Short, wide, flatter',   'Sacral index'],
    ['Acetabulum',           'Large (>52 mm)',          'Smaller (<50 mm)',       'Diameter measurement'],
    ['Pre-auricular sulcus', 'Absent / shallow',        'Present (deep)',         'Highly reliable in females'],
    ['Obturator foramen',    'Oval (large)',            'Triangular (smaller)',   'Shape assessment'],
]
t3_widths = [3.5*cm, 3.5*cm, 3.5*cm, 4.5*cm]
t3 = Table(table3_data, colWidths=t3_widths)
t3.setStyle(TableStyle([
    ('BACKGROUND',   (0,0), (-1,0),  TABLE_HEADER),
    ('TEXTCOLOR',    (0,0), (-1,0),  WHITE),
    ('FONTNAME',     (0,0), (-1,0),  'Helvetica-Bold'),
    ('FONTSIZE',     (0,0), (-1,0),  8.5),
    ('ALIGN',        (0,0), (-1,0),  'CENTER'),
    ('FONTNAME',     (0,1), (-1,-1), 'Helvetica'),
    ('FONTSIZE',     (0,1), (-1,-1), 8.5),
    *[('BACKGROUND', (0,i), (-1,i), TABLE_ROW1 if i % 2 == 1 else TABLE_ROW2)
      for i in range(1, 8)],
    ('GRID',         (0,0), (-1,-1), 0.5, HexColor('#CBD5E1')),
    ('BOX',          (0,0), (-1,-1), 1,   HexColor('#94A3B8')),
    ('TOPPADDING',   (0,0), (-1,-1), 4),
    ('BOTTOMPADDING',(0,0), (-1,-1), 4),
    ('LEFTPADDING',  (0,0), (-1,-1), 5),
    ('RIGHTPADDING', (0,0), (-1,-1), 5),
    ('VALIGN',       (0,0), (-1,-1), 'MIDDLE'),
]))
story.append(t3)
story.append(Spacer(1, 8))

story.append(Paragraph('Why Not Others?', exp_h2))
story += [
    bullet('<b>A. Male because sub-pubic angle <90°:</b> The cut-off for males is <70° (not <90°). '
           'An 80° angle is consistent with an Indian female, not male.'),
    bullet('<b>C. Curved sacrum is exclusively male:</b> WRONG. A curved sacrum is actually '
           'more typical of males (longer, more curved), but this is not an exclusive feature. '
           'The sub-pubic angle is the more reliable differentiator here.'),
    bullet('<b>D. Cannot determine from pelvis:</b> The pelvis is the MOST RELIABLE bone for '
           'sex determination (accuracy ~95%). This option is incorrect.'),
]
story.append(Spacer(1, 4))
story += key_box([
    'Pelvis is the most reliable bone for sex determination (accuracy ~95%)',
    'Sub-pubic angle: Male <70°,  Female >80° (Indian: 80–85°)',
    'Wide sciatic notch + present pre-auricular sulcus = almost certainly female',
    'Skull is 2nd most reliable; long bones (e.g., femur head >45 mm → male) are 3rd',
])

# ── Footer note ──
story.append(Spacer(1, 12))
story.append(HRFlowable(width='100%', thickness=1.5, color=DARK_BLUE))
story.append(Spacer(1, 4))
footer_txt = (
    '<font color="#1A2F5A"><b>MARROW ED8 | Forensic Medicine PYQ Bank</b></font>  '
    '· Chapter 1: Skeletal &amp; Dental Age Determination  '
    '·  Prepared in ZVrecommended format'
)
story.append(Paragraph(footer_txt,
    S('footer', fontSize=8, leading=11, alignment=TA_CENTER,
      textColor=HexColor('#64748B'), fontName='Helvetica')))

# ── Build ─────────────────────────────────────────────────────────────────────
doc.build(story)
print('PDF created:', OUTPUT)