from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import inch, cm
from reportlab.lib import colors
from reportlab.platypus import (
    SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle,
    PageBreak, HRFlowable, KeepTogether
)
from reportlab.lib.enums import TA_LEFT, TA_CENTER, TA_JUSTIFY
import datetime

OUTPUT_PATH = "/home/daytona/workspace/neet-pg-2026/NEET_PG_2026_ENT_Ophth_Forensic_OneLiners.pdf"

# ── colour palette ────────────────────────────────────────────────
C_DARK_BLUE    = colors.HexColor("#1A237E")
C_TEAL         = colors.HexColor("#00838F")
C_CRIMSON      = colors.HexColor("#880E4F")
C_FOREST       = colors.HexColor("#1B5E20")
C_INDIGO       = colors.HexColor("#283593")
C_BROWN        = colors.HexColor("#4E342E")
C_DEEP_PURPLE  = colors.HexColor("#4A148C")
C_DEEP_ORANGE  = colors.HexColor("#BF360C")
C_DEEP_TEAL    = colors.HexColor("#004D40")
C_AMBER        = colors.HexColor("#FF6F00")
C_NAVY         = colors.HexColor("#0D47A1")

C_LIGHT_BLUE   = colors.HexColor("#E3F2FD")
C_LIGHT_ROSE   = colors.HexColor("#FCE4EC")
C_LIGHT_GREEN  = colors.HexColor("#E8F5E9")
C_LIGHT_INDIGO = colors.HexColor("#E8EAF6")
C_LIGHT_PURPLE = colors.HexColor("#F3E5F5")
C_LIGHT_ORANGE = colors.HexColor("#FFF3E0")
C_LIGHT_TEAL   = colors.HexColor("#E0F2F1")
C_LIGHT_AMBER  = colors.HexColor("#FFF8E1")
C_LIGHT_BROWN  = colors.HexColor("#EFEBE9")

C_DARK_GREY    = colors.HexColor("#424242")
C_YELLOW       = colors.HexColor("#F9A825")
C_WHITE        = colors.white

styles = getSampleStyleSheet()

def make_styles():
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        "toc_header", fontName="Helvetica-Bold", fontSize=16,
        textColor=C_DARK_BLUE, alignment=TA_CENTER, spaceAfter=12)
    s["toc_entry"] = ParagraphStyle(
        "toc_entry", fontName="Helvetica", fontSize=11,
        textColor=C_DARK_GREY, leftIndent=20, spaceAfter=4)
    s["section_heading"] = ParagraphStyle(
        "section_heading", fontName="Helvetica-Bold", fontSize=15,
        textColor=C_WHITE, alignment=TA_LEFT, spaceAfter=0,
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    s["subsection"] = ParagraphStyle(
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    s["oneliner"] = ParagraphStyle(
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    s["footer"] = ParagraphStyle(
        "footer", fontName="Helvetica", fontSize=8,
        textColor=C_DARK_GREY, alignment=TA_CENTER)
    return s

def section_header_table(title, bg_color, S):
    cell = Paragraph(title, S["section_heading"])
    t = Table([[cell]], colWidths=[7.0*inch])
    t.setStyle(TableStyle([
        ("BACKGROUND", (0,0), (-1,-1), bg_color),
        ("TOPPADDING",    (0,0), (-1,-1), 8),
        ("BOTTOMPADDING", (0,0), (-1,-1), 8),
        ("LEFTPADDING",   (0,0), (-1,-1), 10),
        ("RIGHTPADDING",  (0,0), (-1,-1), 10),
        ("ROUNDEDCORNERS", [6, 6, 6, 6]),
    ]))
    return t

def oneliner_block(fact, hook, S, bg):
    bullet = Table(
        [[Paragraph(u"\u2022 " + fact, S["oneliner"]),
          Paragraph(u"\u2605 " + hook, S["hook"])]],
        colWidths=[3.8*inch, 3.2*inch]
    )
    bullet.setStyle(TableStyle([
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        ("VALIGN",        (0,0), (-1,-1), "TOP"),
        ("TOPPADDING",    (0,0), (-1,-1), 5),
        ("BOTTOMPADDING", (0,0), (-1,-1), 5),
        ("LEFTPADDING",   (0,0), (-1,-1), 6),
        ("RIGHTPADDING",  (0,0), (-1,-1), 6),
        ("ROUNDEDCORNERS",[4,4,4,4]),
        ("LINEBELOW", (0,0), (-1,-1), 0.3, colors.HexColor("#DDDDDD")),
    ]))
    return [bullet, Spacer(1, 0.03*inch)]

def add_section(story, title, bg_color, light_bg, data, S):
    story.append(PageBreak())
    story.append(section_header_table(title, bg_color, S))
    story.append(Spacer(1, 0.12*inch))
    _ = light_bg
    for subsec, entries in data:
        story.append(Paragraph(subsec, S["subsection"]))
        for fact, hook in entries:
            for elem in oneliner_block(fact, hook, S, _):
                story.append(elem)
        story.append(Spacer(1, 0.04*inch))

# ════════════════════════════════════════════════════════════════════
# DATA SECTIONS
# ════════════════════════════════════════════════════════════════════

ENT = [
  ("Ear - Anatomy & Physiology", [
    ("Tympanic membrane: cone-shaped; pars tensa (lower 4/5) + pars flaccida (Shrapnell's membrane, upper 1/5); light reflex at anteroinferior quadrant.",
     "TM: Pars flaccida = upper = Shrapnell's; light reflex = antero-inferior = 5 o'clock position"),
    ("Ossicles: malleus (handle attached to TM) → incus (bridge) → stapes (footplate in oval window); amplify sound 22x (lever ratio + areal ratio).",
     "MIS: Malleus-Incus-Stapes; malleus = TM; stapes = oval window; sound amplified 22x"),
    ("Eustachian tube: 36 mm adult; 17 mm child (more horizontal); opens into nasopharynx; equalises middle ear pressure; opens during swallowing/yawning.",
     "ET in children: shorter + horizontal = more prone to middle ear infections"),
    ("Cochlea: 2.5 turns; scala vestibuli (perilymph) + scala media (endolymph) + scala tympani (perilymph); Organ of Corti on basilar membrane; hair cells detect vibration.",
     "Cochlea: endolymph = high K+ (like intracellular); basilar membrane = frequency mapping; base = high freq, apex = low freq"),
    ("Vestibular apparatus: utricle + saccule (linear acceleration, gravity) + 3 semicircular canals (angular acceleration); macula = otolith organ.",
     "Semicircular canals = rotational; utricle/saccule = linear; macula has otoliths"),
    ("Rinne test: BC > AC = Rinne negative = conductive hearing loss; AC > BC = Rinne positive = normal or SNHL.",
     "Rinne negative (BC>AC) = Conductive loss; positive (AC>BC) = normal/SNHL"),
    ("Weber test: lateralises to affected ear in conductive loss; to better ear in SNHL.",
     "Weber: goes TO bad ear in conductive; AWAY from bad ear in SNHL"),
  ]),
  ("Ear - Diseases", [
    ("Acute otitis media: MC organism = Streptococcus pneumoniae (all ages); children also Haemophilus influenzae, Moraxella catarrhalis; treat with amoxicillin.",
     "AOM: MC = S. pneumoniae; amoxicillin first line; penicillin allergy = azithromycin"),
    ("Chronic suppurative otitis media (CSOM): Tubotympanic (safe, central perforation, mucoid discharge, no cholesteatoma) vs Atticoantral (unsafe, marginal/attic perforation, cholesteatoma).",
     "CSOM: Tubotympanic=Safe=Central; Atticoantral=Unsafe=Attic=Cholesteatoma"),
    ("Cholesteatoma: stratified squamous epithelium in middle ear; keratin accumulation; bone erosion; MC complication = facial nerve palsy; 'coffee bean' pearly mass on otoscopy.",
     "Cholesteatoma = skin in wrong place; erodes bone; pearly white = 'dead skin in ear'"),
    ("Otosclerosis: fixation of stapes footplate; autosomal dominant; bilateral; Carhart's notch at 2000 Hz on audiogram; treat with stapedectomy.",
     "Otosclerosis: AD; stapes fixed; Carhart notch 2kHz; treatment = stapedectomy (replace with prosthesis)"),
    ("Meniere's disease: endolymphatic hydrops; triad = episodic vertigo + fluctuating SNHL + tinnitus + aural fullness; low-frequency SNHL first.",
     "Meniere's = VTHS: Vertigo + Tinnitus + Hearing loss + fullneSS; low freq first affected"),
    ("Benign Paroxysmal Positional Vertigo (BPPV): MC cause of vertigo; canalith in posterior semicircular canal; Dix-Hallpike positive; treat with Epley manoeuvre.",
     "BPPV: MC vertigo; Dix-Hallpike test; Epley = canalith repositioning; canaliths = calcium carbonate crystals"),
    ("Acoustic neuroma (vestibular schwannoma): CN VIII tumor; CPA angle; unilateral SNHL + tinnitus + vertigo; bilateral = NF2; MRI = investigation of choice.",
     "Acoustic neuroma: CN VIII; CPA; bilateral = NF2 (chromosome 22); MRI gadolinium = gold standard"),
    ("Presbycusis: age-related SNHL; bilateral; starts at high frequencies; sensory degeneration of Organ of Corti.",
     "Presbycusis: old age; high freq loss first (4-8 kHz); bilateral symmetric; wear hearing aids"),
    ("Otitis externa (Swimmer's ear): MC = Pseudomonas aeruginosa; pain on tragus pressure/pinna movement; treat with topical ciprofloxacin + steroid.",
     "Otitis externa: Pseudomonas; pain on pinna traction = key sign; swimmer's ear"),
    ("Malignant (necrotizing) otitis externa: elderly diabetics; Pseudomonas; skull base osteomyelitis; facial nerve palsy; treat with IV ciprofloxacin + surgery.",
     "Malignant OE: diabetic + Pseudomonas + cranial nerve palsies = emergency"),
  ]),
  ("Nose & Paranasal Sinuses", [
    ("Blood supply of nasal septum: Little's area (Kiesselbach's plexus) = confluence of 5 arteries (anterior ethmoidal, posterior ethmoidal, sphenopalatine, greater palatine, superior labial); MC site of epistaxis.",
     "Little's area = Kiesselbach's plexus = MC epistaxis site = antero-inferior septum"),
    ("Epistaxis: anterior = MC (Little's area); posterior = from sphenopalatine artery (elderly, hypertensives); posterior bleeds more severe.",
     "Anterior epistaxis = Little's area; posterior = sphenopalatine artery = more dangerous, elderly"),
    ("Sinuses in order of development: maxillary (present at birth) → ethmoid (birth) → sphenoid (3rd year) → frontal (last, 6-7 years).",
     "Sinus development: Maxillary first (at birth); Frontal last (6-7 years); 'My Eager Students Follow'"),
    ("Maxillary sinusitis: MC sinus involved; drainage through ostium on medial wall (high up = poor drainage); toothache-like pain; pus drips into nasopharynx.",
     "Maxillary: MC sinus; ostium high up = poor drainage; upper tooth pain = clue"),
    ("Frontal sinusitis: complications = Pott's puffy tumor (osteomyelitis of frontal bone with subperiosteal abscess); meningitis.",
     "Frontal sinusitis complication = Pott's puffy tumor (forehead swelling + osteomyelitis)"),
    ("Allergic rhinitis: IgE mediated; seasonal (pollens) vs perennial (dust mites, mold); pale bluish turbinates; treat with intranasal corticosteroids + antihistamines.",
     "Allergic rhinitis: IgE; pale boggy turbinates; INCS = first line; antihistamines for sneezing/itch"),
    ("Nasal polyps: bilateral = allergic/non-allergic; unilateral = rule out malignancy; ethmoidal MC; Samter's triad = asthma + polyps + aspirin sensitivity.",
     "Nasal polyps: bilateral=benign; unilateral=malignancy till proven; Samter's triad = aspirin + asthma + polyps"),
    ("Angiofibroma (juvenile nasopharyngeal angiofibroma - JNA): adolescent males; epistaxis + nasal obstruction; hypervascular; CT = Holman-Miller sign (anterior bowing of posterior wall of maxillary sinus); biopsy contraindicated.",
     "JNA: teenage boy + epistaxis = JNA; Holman-Miller sign on CT; no biopsy (bleeds); embolize then excise"),
    ("CSF rhinorrhea: halo sign on gauze (blood centre + CSF halo); glucose positive; beta-2 transferrin = confirmatory test.",
     "CSF leak: halo test; beta-2 transferrin = gold standard; glucose present unlike normal mucus"),
  ]),
  ("Throat & Larynx", [
    ("Tonsils (Waldeyer's ring): palatine (tonsils proper) + pharyngeal (adenoids) + lingual + tubal; Waldeyer's ring = lymphoid tissue guarding oropharynx.",
     "Waldeyer's ring: palatine + pharyngeal (adenoids) + lingual + tubal tonsils = immune gateway"),
    ("Tonsillitis: acute = MC Group A beta-hemolytic Streptococcus (S. pyogenes); follicular tonsillitis; treat with penicillin V / amoxicillin.",
     "Acute tonsillitis: GABHS = S. pyogenes; white follicles; penicillin; rheumatic fever prevention"),
    ("Peritonsillar abscess (Quinsy): complication of tonsillitis; unilateral swelling; uvula displaced to opposite side; hot potato voice; treat with drainage + antibiotics.",
     "Quinsy: peritonsillar abscess; uvula pushed away from abscess side; hot potato voice; drain it"),
    ("Adenoid hypertrophy: children; nasal obstruction + mouth breathing + hyponasal voice + conductive hearing loss (Eustachian tube obstruction); adenoid facies.",
     "Adenoids: children; mouth breathing + conductive HL + hyponasal voice = triad; adenoid facies = open mouth + dull expression"),
    ("Obstructive sleep apnea (OSA): AHI >5/hour; MC cause in children = adenotonsillar hypertrophy; adults = obesity; CPAP = treatment.",
     "OSA: AHI>5; children=adenoids; adults=obesity; CPAP = treatment; overnight polysomnography = gold standard"),
    ("Laryngitis: acute = viral (MC); hoarseness; rest voice + steam inhalation; chronic = vocal abuse, GERD, smoking.",
     "Acute laryngitis: viral; hoarse voice; rest = key treatment; chronic = GERD + smoking + vocal abuse"),
    ("Vocal cord polyp: unilateral; due to vocal abuse (singers, teachers); treat with microsurgery (microlaryngoscopy).",
     "Vocal polyp: unilateral; singers/voice abuse; microlaryngoscopy = treatment"),
    ("Reinke's edema: bilateral diffuse swelling of vocal cords; smoker + hypothyroid women; low-pitched voice; treat by smoking cessation + surgery.",
     "Reinke's edema: smoker + bilateral VC edema; low-pitched female voice; bilateral unlike polyp"),
    ("Laryngomalacia: MC cause of stridor in infants; inspiratory stridor; omega-shaped epiglottis; resolves by 18-24 months; treated conservatively.",
     "Laryngomalacia: MC infant stridor; inspiratory; omega epiglottis; resolves spontaneously by 2 years"),
    ("Acute epiglottitis: Haemophilus influenzae type b (Hib); 'cherry red epiglottis'; tripod position; thumb sign on lateral neck X-ray; do NOT examine throat; secure airway first.",
     "Epiglottitis: H. influenzae b; thumb sign on X-ray; tripod posture; do NOT depress tongue = fatal; airway = priority"),
    ("Laryngeal carcinoma: MC = glottic (best prognosis, early hoarseness); supraglottic = late presentation; infraglottic/subglottic = worst prognosis; MC type = squamous cell carcinoma.",
     "Larynx CA: glottic = MC + best prognosis (early hoarseness); supraglottic = late; all = squamous cell CA"),
    ("Cricothyrotomy (emergency): between thyroid + cricoid cartilage; emergency airway; tracheotomy site = between 2nd and 3rd tracheal rings.",
     "Cricothyrotomy: thyroid-cricoid membrane; emergency access; tracheostomy = between 2nd-3rd rings (elective)"),
    ("Foreign body in airway: child; MC site = right main bronchus (more vertical, wider, shorter); Heimlich manoeuvre for >1 year; back blows for <1 year.",
     "FB airway: right bronchus MC (more vertical); Heimlich >1yr; back blows <1yr; rigid bronchoscopy = treatment"),
    ("Parapharyngeal space infections: anterior compartment (medial to pterygoids); bulge on lateral pharyngeal wall; can spread to retropharyngeal space → danger space → mediastinitis.",
     "Parapharyngeal abscess → retropharyngeal → danger space → mediastinitis = descending necrotizing mediastinitis"),
  ]),
  ("Hearing & Audiology", [
    ("Audiogram: X-axis = frequency (250-8000 Hz); Y-axis = intensity (dB HL); air conduction (circles) + bone conduction (brackets); Air-bone gap = conductive loss.",
     "Audiogram: AC-BC gap = conductive; BC normal + AC impaired = conductive; both down = SNHL"),
    ("Hearing loss classification: normal 0-25 dB; mild 26-40 dB; moderate 41-55 dB; moderately severe 56-70 dB; severe 71-90 dB; profound >90 dB.",
     "Hearing loss dB: 0-25=normal; 26-40=mild; 41-55=mod; 56-70=mod-severe; 71-90=severe; >90=profound"),
    ("Tympanometry: Type A = normal; Type As = stiffness (otosclerosis); Type Ad = flaccid/discontinuity (ossicular); Type B = flat = effusion/perforation; Type C = negative pressure = ET dysfunction.",
     "Tympanogram: A=normal; B=flat=effusion; C=negative pressure=ET dysfunction; As=otosclerosis; Ad=ossicular disruption"),
    ("OAE (Otoacoustic emissions): from outer hair cells; present in normal hearing and mild loss; absent in SNHL >30 dB; used for newborn hearing screening.",
     "OAE: outer hair cells; absent in SNHL >30dB; newborn screening tool; easy + non-invasive"),
    ("BERA/ABR: brainstem auditory evoked responses; 5 waves (I-V); Wave I = auditory nerve; Wave V = inferior colliculus; used for threshold estimation + retrocochlear pathology.",
     "BERA waves I-V: I=auditory nerve; V=inferior colliculus; delayed wave V = acoustic neuroma; gold standard for objective threshold in infants"),
  ]),
]

OPHTHALMOLOGY = [
  ("Anatomy of the Eye", [
    ("Layers of the eye: outer fibrous (cornea + sclera) + middle vascular/uveal (iris + ciliary body + choroid) + inner neural (retina).",
     "Eye layers: Fibrous outer (cornea+sclera); Uveal middle (iris+CB+choroid); Neural inner (retina)"),
    ("Cornea: avascular; 5 layers: epithelium → Bowman's layer → stroma (90% thickness) → Descemet's membrane → endothelium; nourished by aqueous humor + tears.",
     "Cornea: avascular; 5 layers (EDSBS); endothelium = pump; stroma = 90%; Bowman's = barrier"),
    ("Lens: biconvex; crystalline; held by zonule of Zinn (ciliary zonule); accommodation = ciliary muscle contracts → zonules relax → lens rounds up = near vision.",
     "Accommodation: ciliary contracts → zonules relax → lens rounds → near vision; presbyopia = loss of accommodation with age"),
    ("Aqueous humor: produced by ciliary processes; flows posterior chamber → pupil → anterior chamber → trabecular meshwork (Canal of Schlemm) → episcleral veins.",
     "Aqueous: ciliary body → posterior chamber → pupil → anterior chamber → trabecular meshwork → Schlemm's canal → venous system"),
    ("Macula: 5.5 mm from optic disc; fovea centralis (1.5 mm) has only cones; no blood vessels; pit = foveola; highest visual acuity.",
     "Macula: temporal to disc; fovea = only cones = highest acuity; avascular = depends on choroid"),
    ("Optic disc: 1.5 mm diameter; nasal to macula; physiological cup (C/D ratio <0.4 normal); no photoreceptors = blind spot.",
     "Optic disc: nasal to macula; blind spot (no photoreceptors); C/D ratio >0.6 = glaucoma suspect"),
    ("Extraocular muscles: LR6(SO4)3 - lateral rectus = CN VI; superior oblique = CN IV; rest = CN III; superior oblique = depresses adducted eye (tested by asking to look down-in).",
     "LR6SO4AO3: Lateral Rectus CN VI; Superior Oblique CN IV; All Others CN III"),
    ("Visual acuity: Snellen chart; 6/6 normal; 6/60 = can read at 6m what normal reads at 60m; less than 6/60 = legal blindness (India: <6/60 or visual field <20 degrees).",
     "Snellen 6/6=normal; <6/60=legal blindness in India; count fingers/hand movements/light perception for worse VA"),
  ]),
  ("Refractive Errors & Cornea", [
    ("Myopia (short-sightedness): parallel rays focus in front of retina; concave (diverging) lens corrects; increased axial length; progressive in childhood.",
     "Myopia: focus in front of retina; concave lens corrects; axial length increased; night myopia = large pupil"),
    ("Hypermetropia (long-sightedness): parallel rays focus behind retina; convex (converging) lens corrects; small eye; accommodative esotropia in children.",
     "Hypermetropia: focus behind retina; convex lens; small eye; convergent squint in children (accommodative esotropia)"),
    ("Astigmatism: unequal curvature of cornea/lens in different meridians; cylindrical lens corrects; regular vs irregular (KC); 'rugby ball' cornea.",
     "Astigmatism: corneal curvature unequal; cylindrical lens; keratoconus = irregular astigmatism; Fleischer ring + Munson's sign"),
    ("Keratoconus: progressive corneal ectasia; bilateral; cone-shaped; Fleischer ring (iron deposits); Munson's sign (V-shaped bulge of lower lid on downgaze); treat with cross-linking early, transplant late.",
     "KC: progressive corneal thinning + cone shape; Fleischer ring + Munson's sign; Rigid CLs + crosslinking + PKP"),
    ("Corneal ulcer: bacterial (Pseudomonas, S. aureus, Strep) = hypopyon; fungal (Aspergillus) = feathery edges; acanthamoeba = contact lens users + ring infiltrate.",
     "Corneal ulcer: Pseudomonas = contact lens; Acanthamoeba = contact lens + ring; fungal = vegetable trauma + feathery edges"),
    ("Pterygium: wing-shaped fibrovascular tissue growing from conjunctiva onto cornea (nasal side MC); due to UV exposure; treatment = surgical excision + conjunctival autograft.",
     "Pterygium: nasal conjunctiva onto cornea; UV exposure; excise + autograft to prevent recurrence"),
    ("Trachoma: Chlamydia trachomatis (serotypes A-C); MC cause of preventable blindness worldwide; SAFE strategy (Surgery, Antibiotics, Face wash, Environmental); Herbert's pits = follicular scars at limbus.",
     "Trachoma: C. trachomatis A-C; MC preventable blindness; SAFE strategy; Herbert's pits = pathognomonic"),
  ]),
  ("Glaucoma", [
    ("Primary open-angle glaucoma (POAG): MC type; asymptomatic until late; IOP>21 mmHg; optic disc cupping (C/D >0.6); arcuate scotoma → nasal step; treat with prostaglandin analogues (latanoprost) first line.",
     "POAG: silent + slow; IOP>21; C/D>0.6; arcuate scotoma; prostaglandin analogues = first line"),
    ("Acute angle-closure glaucoma (AACG): emergency; sudden severe eye pain + headache + vomiting + halos + fixed mid-dilated pupil + rock-hard eye; precipitated by dark/mydriatics; treat with IV acetazolamide + pilocarpine + laser iridotomy.",
     "AACG: emergency; pain + vomiting + halos + mid-dilated fixed pupil; IV acetazolamide + pilocarpine; laser PI = definitive"),
    ("Normal tension glaucoma: optic disc damage with normal IOP (<21 mmHg); disc haemorrhages; treat to lower IOP by 30%; associated with vasospasm, low BP.",
     "NTG: glaucoma damage at normal IOP; disc haemorrhage common; lower IOP by 30%; Raynaud's/migraine association"),
    ("Secondary glaucoma: pigmentary (Krukenberg spindle); pseudoexfoliation (MC secondary OAG worldwide); neovascular (rubeosis from DM/CRVO); steroid-induced.",
     "Secondary glaucoma: Pseudoexfoliation = MC worldwide; Neovascular = DM/CRVO rubeosis; Steroid = 6 weeks after topical steroid"),
    ("Glaucoma drugs: Prostaglandin analogues (latanoprost) = increase uveoscleral outflow; Beta-blockers (timolol) = decrease production; CAIs (dorzolamide/acetazolamide) = decrease production; Pilocarpine = increase trabecular outflow.",
     "Glaucoma Rx: PGA=first line (increase outflow); Timolol=decrease production; Acetazolamide=systemic CAI; Pilocarpine=AACG"),
    ("Optic disc changes in glaucoma: increased C/D ratio; vertical elongation of cup; bayoneting of vessels; disc haemorrhage; nasal displacement of vessels; RNFL loss.",
     "Glaucoma disc: C/D>0.6; vertical cup; bayoneting; disc haemorrhage; baring of circumlinear vessels"),
  ]),
  ("Cataract & Lens", [
    ("Cataract: opacification of lens; MC cause worldwide = age-related (senile); in India = MC cause of blindness = cataract; nuclear (brown/brunescent), cortical (spoke-wheel), posterior subcapsular (PSC - worst vision, steroids/DM).",
     "Cataract: MC blindness India = cataract; PSC = worst for reading/bright light; nuclear = myopic shift; cortical = spoke-wheel"),
    ("Senile cataract types: immature (partially opaque, iris shadow +); mature (fully opaque, iris shadow absent); hypermature (Morgagnian - liquefied cortex, nucleus sinks).",
     "Cataract maturity: immature=iris shadow+; mature=no iris shadow; hypermature=Morgagnian (nucleus sinks)"),
    ("Surgical treatment: ECCE (extracapsular) + IOL insertion = standard; phacoemulsification = gold standard; Femtosecond laser LASIK for refractive errors.",
     "Phacoemulsification = gold standard for cataract; IOL = posterior chamber; posterior capsule opacification = most common post-op complication"),
    ("Congenital cataract: bilateral = rule out metabolic (galactosemia, Lowe's, Wilson's) + systemic (Down's, rubella); unilateral = sporadic; treat before 6-8 weeks to prevent amblyopia.",
     "Congenital cataract: TORC infections (rubella); galactosemia; treat before 6-8 weeks or amblyopia develops"),
    ("Subluxated lens: Marfan's (upward dislocation, superotemporal) vs Homocystinuria (downward, inferonasal); also in syphilis, Weill-Marchesani.",
     "Lens dislocation: Marfan=upward (superotemporal); Homocystinuria=downward (inferonasal); 'Marfan=UP; Homocystinuria=DOWN'"),
  ]),
  ("Retina", [
    ("Retinal detachment: rhegmatogenous (hole/tear, MC, myopes/trauma) vs tractional (DM/sickle cell) vs exudative (HTN, malignancy); Shafer's sign = tobacco dust in vitreous; laser + surgery.",
     "RD: rhegmatogenous=MC; Shafer's sign=tobacco dust; myopes at risk; treat: laser/cryo + scleral buckle/vitrectomy"),
    ("Diabetic retinopathy: NPDR (microaneurysms, dot-blot haemorrhages, CWS, IRMA) → PDR (neovascularisation = NVD/NVE); macular oedema = MC cause of visual loss in DM.",
     "DR: NPDR→PDR; NVD/NVE=new vessels=PDR; Macular oedema=MC visual loss; VEGF drives neovascularisation"),
    ("Hypertensive retinopathy (Keith-Wagener-Barker): Grade 1 = arteriolar narrowing; Grade 2 = AV nipping; Grade 3 = flame haemorrhages + CWS; Grade 4 = papilloedema.",
     "HTN retinopathy: Grade 1-4; Grade 3=haemorrhages+CWS; Grade 4=papilloedema = malignant HTN"),
    ("CRVO (Central Retinal Vein Occlusion): 'Stormy sunset' fundus; disc oedema; all 4 quadrants flame haemorrhages; associated with HTN + glaucoma; treat with anti-VEGF.",
     "CRVO: stormy sunset fundus; all 4 quadrant haemorrhages; HTN+glaucoma association; anti-VEGF for macular oedema"),
    ("CRAO (Central Retinal Artery Occlusion): sudden painless visual loss; cherry red spot at macula (choroid shows through thin infarcted retina); treat within 90 min (ocular stroke).",
     "CRAO: sudden painless vision loss; cherry red spot (macula surrounded by pale retina); emergency = 90 min window"),
    ("Age-related macular degeneration (AMD): MC cause of irreversible vision loss in developed countries (>50 yrs); drusen = hallmark; dry (atrophic, 90%) vs wet (exudative/neovascular, 10%, severe).",
     "AMD: drusen=dry; wet=neovascular=anti-VEGF; MC irreversible blindness developed world; Amsler grid for monitoring"),
    ("Retinitis pigmentosa: genetic; rod photoreceptor dystrophy; night blindness (nyctalopia) first; bone-spicule pigmentation; tunnel vision; ERG reduced.",
     "RP: rods affected first; night blindness → tunnel vision → blindness; bone-spicule pigment; ERG = most sensitive test"),
    ("Retinoblastoma: MC intraocular malignancy in children; leukocoria (white pupil) + strabismus; bilateral = germline (RB1 mutation, Ch13q14); trilateral = pinealoma; treat with chemoreduction + laser/cryo/enucleation.",
     "Retinoblastoma: MC child eye tumour; leukocoria + cat's eye reflex; RB1 gene Ch13q14; bilateral=hereditary; trilateral=pinealoma"),
  ]),
  ("Strabismus & Paediatric Ophthalmology", [
    ("Amblyopia: reduced visual acuity in structurally normal eye; causes = strabismus, anisometropia, deprivation (cataract); treat with occlusion therapy of fellow eye; critical period = up to 7-8 years.",
     "Amblyopia: lazy eye; squint + anisometropia + deprivation; occlusion of good eye = treatment; critical period 7-8 yrs"),
    ("Esotropia (convergent squint): eyes turn inward; accommodative esotropia in hypermetropes; surgical if non-accommodative.",
     "Esotropia=eyes in; accommodative=hypermetropia; treat hypermetropia first; surgery if non-accommodative"),
    ("Exotropia (divergent squint): eyes turn outward; intermittent exotropia MC; worsens in bright light (eye closes to suppress diplopia).",
     "Exotropia=eyes out; intermittent=MC; worsens in bright light; surgery when deviation >20 PD"),
    ("CN VI palsy: lateral rectus palsy; esotropia; diplopia on lateral gaze; MC cause = vascular (DM, HTN); also raised ICP (false localizing sign).",
     "CN VI palsy: LR palsy; can't abduct; esotropia; false localizing sign in raised ICP"),
    ("CN III palsy: 'down-and-out' eye; ptosis + mydriasis; surgical = posterior communicating artery aneurysm (pupil-involving); medical = DM (pupil-sparing).",
     "CN III palsy: down and out + ptosis + dilated pupil; PComm aneurysm = surgical emergency (pupil involved); DM = pupil spared"),
  ]),
  ("Eyelids, Orbit & Lacrimal", [
    ("Chalazion vs Hordeolum: chalazion = lipogranuloma of meibomian gland, painless, treat with hot compress → incision + curettage; hordeolum (stye) = S. aureus infection of Zeis/Moll gland, painful, treat with hot compress + antibiotics.",
     "Chalazion=painless meibomian cyst; Stye (hordeolum)=painful S. aureus infection; both: warm compress first"),
    ("Entropion: inward turning of eyelid; lower lid; causes = age-related (involutional), cicatricial (trachoma, SJS); corneal abrasion/ulcer complication; treat with surgery.",
     "Entropion=lid turns IN; lashes touch cornea; involutional (elderly) or trachoma; corrective surgery"),
    ("Ectropion: outward turning of eyelid; lower lid; causes = involutional, cicatricial, paralytic (CN VII palsy); epiphora (tearing) + exposure keratitis; treat with surgery.",
     "Ectropion=lid turns OUT; epiphora + exposure; CN VII palsy = paralytic ectropion; corrective surgery"),
    ("Ptosis: drooping of upper eyelid (normal = 1-2 mm above pupil); Marcus Gunn jaw-winking = congenital; Horner's = partial ptosis + miosis + anhidrosis; CN III palsy = complete ptosis + mydriasis.",
     "Ptosis: complete+mydriasis=CN3; partial+miosis=Horner's; Marcus Gunn=synkinesis with pterygoid"),
    ("Proptosis/exophthalmos: bilateral = Graves' disease (thyroid eye disease = MC cause); unilateral = orbital cellulitis, tumour; Hertel exophthalmometer measures proptosis.",
     "Proptosis: bilateral=Graves (thyroid); unilateral=orbital cellulitis/tumour; Hertel exophthalmometer; >18mm = abnormal"),
    ("Dacryocystitis: infection of lacrimal sac; MC organism = Streptococcus (adults), H. influenzae (infants); medial canthal swelling; regurgitation on pressure; treat with DCR (dacryocystorhinostomy).",
     "Dacryocystitis: lacrimal sac infection; regurgitation on pressure = key sign; DCR = definitive treatment"),
  ]),
]

FORENSIC = [
  ("Legal & Medical Jurisprudence", [
    ("IPC Section 302: murder (punishment = death or life imprisonment); IPC 304: culpable homicide not amounting to murder; IPC 304A: death by rash/negligent act.",
     "IPC 302=murder; 304=culpable homicide; 304A=negligent death (doctor's liability); 307=attempt to murder"),
    ("IPC Section 375 & 376: rape = sexual intercourse without consent or with minor <18 years (POSCO); age of consent = 18 years in India; medical examination (FSST).",
     "Rape: IPC 376; consent age = 18 yrs; POCSO for minors; medical examination = within 24-72 hrs; hymen findings NOT diagnostic"),
    ("Dying declaration: statement made by dying person regarding cause of death; admissible even if person dies; must be made voluntarily + in sound mind; magistrate preferred but doctor can record.",
     "Dying declaration: admissible; made in expectation of death; magistrate preferred; doctor can certify mental state; thumb impression accepted"),
    ("Inquest: inquiry into cause of death; police inquest (Sec 174 CrPC) = most common; magistrate inquest (Sec 176 CrPC) = custodial death, dowry death; coroner inquest = some cities.",
     "Inquest: Sec 174 CrPC = police; Sec 176 = magistrate (custodial/dowry death); coroner = Bombay/Madras; doctor called as witness"),
    ("Exhumation: disinterment of buried body; ordered by magistrate; in presence of magistrate + police; doctor submits separate report; no statute of limitations.",
     "Exhumation: magistrate order + presence; doctor submits separate report; any time after burial; body may be preserved with lime"),
    ("Medical negligence (Bolam test): doctor not negligent if acted in accordance with practice accepted by responsible body of medical opinion; 4 D's = Duty, Dereliction, Damage, Direct causation.",
     "Negligence: Bolam test; 4 D's = Duty + Dereliction + Damage + Direct link; criminal negligence = higher threshold (gross/reckless)"),
    ("Consent in medicine: valid consent = informed + voluntary + competent; age of majority = 18 years; minors = guardian consent; emergency = no consent needed; triage = implied consent.",
     "Consent: informed + voluntary + competent; age 18 = adult; emergency = implied consent; written consent for surgery/procedures"),
  ]),
  ("Thanatology - Changes After Death", [
    ("Pallor mortis: first sign of death; occurs within minutes; due to cessation of circulation; skin becomes pale/ashy.",
     "Pallor mortis: first postmortem change; within minutes; pale skin due to blood pooling"),
    ("Algor mortis: cooling of body after death; body cools at ~1°C per hour (Henssge's nomogram); delayed by obesity/warm environment; used to estimate time of death (TOD).",
     "Algor mortis: 1°C/hour cooling; affected by body weight, clothing, environment; Henssge nomogram for TOD"),
    ("Rigor mortis: muscle stiffening due to ATP depletion + actin-myosin cross-linking; begins 2-6 hrs; complete 12 hrs; passes off 24-48 hrs; follows Nysten's rule (jaw→neck→trunk→extremities).",
     "Rigor mortis: ATP gone → actin-myosin locked; Nysten's rule = jaw first; complete 12h; gone 24-48h; hot = faster"),
    ("Livor mortis (hypostasis): purple-red discolouration at dependent parts due to blood pooling; appears 30 min - 2 hours; becomes fixed (not blanchable) after 6-12 hours.",
     "Livor mortis: gravity + RBC pool; fixed after 6-12h (no blanching); shifted if body moved before fixing"),
    ("Putrefaction: bacterial decomposition; green discolouration starts at right iliac fossa (cecum = most bacteria); marbling of skin; bloating; skin slippage.",
     "Putrefaction: starts RIF (cecum); marbling; green→black; skin slippage; warm+moist = faster decomposition"),
    ("Adipocere: grave wax; saponification of body fat into soap-like material; in moist/water environments; preserves body outline; takes weeks-months.",
     "Adipocere: soap formation from fat; moist environment; preserves body; can indicate time of submersion"),
    ("Mummification: desiccation/drying of body; dry hot environments; skin becomes dry and leathery; may preserve body indefinitely; Egypt mummies.",
     "Mummification: dry + hot environment; body desiccates; preserves tissue; opposite of adipocere (dry vs wet)"),
    ("Cadaveric spasm (instantaneous rigor): immediate rigor at time of death; extreme emotion/violent death; object clutched in hand = sign of suicidal drowning (grass in hand).",
     "Cadaveric spasm: immediate; violent/emotional death; grass/weapon in fist = suicidal drowning; cannot be simulated postmortem"),
  ]),
  ("Wounds & Injuries", [
    ("Abrasion: superficial injury to epidermis; scratch/graze/pressure; direction of force can be determined; imprint abrasion = object pattern.",
     "Abrasion: superficial skin scraping; direction of force = tail end deeper; imprint = object pattern; scratches = fingernails"),
    ("Contusion (bruise): bleeding into soft tissues; size not proportional to force; moves to dependent areas; colour changes: red→blue→green→yellow→brown (haemosiderin); periorbital = raccoon eyes (basal skull fracture).",
     "Bruise colours: red(fresh)→blue/black→green→yellow→brown; raccoon eyes = base of skull # or blunt eye trauma"),
    ("Laceration: torn wound from blunt force; irregular margins; hair bridges; tags of tissue; crushing + tearing; NOT from sharp objects (incised wounds have clean margins).",
     "Laceration=blunt; irregular margins + hair bridges + tissue tags; sharp=incised=clean margins; key distinction"),
    ("Incised wound: sharp-edged weapon (knife, glass); clean-cut margins; length > depth; heals well; gaping in direction perpendicular to Langer's lines.",
     "Incised wound: length>depth; clean margins; no bridges; suicidal = wrists/neck; hesitation cuts parallel"),
    ("Stab wound: depth > surface dimensions; can be fatal without large surface wound; direction of stabbing determined by examining track; double-edged knife = spindle-shaped wound.",
     "Stab wound: depth>width; single-edged=one sharp angle, one blunt; double-edged=both sharp; direction determined from track"),
    ("Defence wounds: on palmar surface of hands/forearms; indicate victim tried to ward off blows; seen in homicide (victim was conscious and mobile).",
     "Defence wounds: palms/forearms; only in conscious victims; help distinguish homicide from suicide"),
    ("Firearm wounds: entry wound = smaller, inverted, abraded collar; exit wound = larger, everted, no abrasion collar; blackening + tattooing at close range; sing of wound from contact firing.",
     "GSW: entry=small+inverted+abraded collar; exit=large+everted; contact shot=stellate wound+muzzle contusion"),
  ]),
  ("Asphyxia", [
    ("Asphyxia: lack of O2 + accumulation of CO2; types = mechanical (hanging, strangulation, suffocation, drowning) + non-mechanical (CO poisoning, overlying).",
     "Asphyxia: O2 lack + CO2 excess; mechanical = external force on airway; stages = dyspnea→convulsions→coma→death"),
    ("General signs of asphyxia (postmortem): cyanosis; congestion of face; petechial haemorrhages (Tardieu spots) on sclera/conjunctiva/pleural/pericardial surfaces; visceral congestion.",
     "Asphyxia PM signs: cyanosis + Tardieu spots (subconjunctival/pleural petechiae) + congestion + right heart dilated with dark blood"),
    ("Hanging: ligature around neck compresses carotid/jugular + vertebral arteries; constricting force = weight of body; ligature mark = oblique + incomplete below angle of jaw.",
     "Hanging: ligature mark oblique + incomplete (gap at ligature knot); above thyroid cartilage; complete hanging = most suicides"),
    ("Strangulation by ligature: external force applied; ligature mark = horizontal + complete (at level of larynx); homicide common; ligature crosses each other.",
     "Ligature strangulation: horizontal + complete ligature mark; homicide (someone else applies force); vs hanging=oblique+incomplete"),
    ("Manual strangulation (throttling): done by hands; fingernail marks; finger-tip bruises on neck; only homicide (cannot do to oneself); fracture of hyoid bone common.",
     "Throttling=manual strangulation=only homicide; fingernail marks + fingertip bruises; hyoid # common; can't strangle yourself"),
    ("Drowning: wet drowning (water enters lungs) vs dry drowning (laryngospasm, no water in lungs); signs = fine frothy foam from mouth/nose; diatoms in bone marrow = diagnostic of drowning.",
     "Drowning: foam at mouth/nose; washerwoman hands; Paltauf's haemorrhages in lungs; diatoms in bone marrow = best PM diagnosis"),
    ("CO poisoning: cherry-red discolouration of skin/mucosa/organs; COHb >50% = fatal; treated with 100% O2; hyperbaric O2 for severe; sources = faulty heaters, car exhaust.",
     "CO poisoning: cherry red = carboxyhaemoglobin; 100% O2 = treatment; COHb >50% fatal; no smell + no irritant = silent killer"),
  ]),
  ("Forensic Toxicology", [
    ("Strychnine poisoning: Nux vomica seeds; opisthotonus (spastic hyperextension); 'risus sardonicus' (fixed grin); convulsions triggered by stimuli; antidote = diazepam/muscle relaxants.",
     "Strychnine: Nux vomica; opisthotonus + risus sardonicus; stimulus-induced convulsions; diazepam = antidote"),
    ("Arsenic poisoning: chronic = Mees' lines (transverse white bands on nails) + Aldrich-Mees lines; rain-drop pigmentation; Blackfoot disease (peripheral vascular disease); Marsh test = detection.",
     "Arsenic: Mees' lines + rain-drop pigmentation + peripheral neuropathy; Marsh test = detection; chronic exposure from groundwater"),
    ("Organophosphate (OP) poisoning: inhibit acetylcholinesterase; SLUDGE (Salivation, Lacrimation, Urination, Defaecation, GI cramps, Emesis) + miosis; antidote = atropine + pralidoxime (2-PAM).",
     "OP poisoning: AChE inhibitor; SLUDGE + miosis; atropine = muscarinic antidote; 2-PAM = reactivates AChE (before aging)"),
    ("Alcohol (ethanol): MC poisoning agent; Widmark's formula for BAC calculation; drunk driving >80 mg/dL (India); fatal level = 400-500 mg/dL; Antabuse (disulfiram) = treatment of alcoholism.",
     "Alcohol: Widmark formula; >80mg/dL India = drunk driving; 400-500 fatal; metabolism 7 kcal/g; disulfiram=aversion therapy"),
    ("Morphine/Opioid poisoning: pin-point pupils (miosis) + unconsciousness + respiratory depression (triad); Cheyne-Stokes respiration; antidote = naloxone; withdrawal = yawning + lacrimation + piloerection.",
     "Opioid OD: miosis + coma + respiratory depression; naloxone reversal; withdrawal = YAWN (Yawning, Anorexia, Watering eyes, Nausea/piloerection)"),
    ("Cyanide poisoning: smell of bitter almonds; histotoxic hypoxia (cells can't use O2); bright red venous blood; antidote = amyl nitrite → sodium nitrite → sodium thiosulfate (or hydroxycobalamin).",
     "Cyanide: bitter almonds smell; histotoxic hypoxia; venous blood = bright red (oxygenated); antidote = nitrites then thiosulfate"),
    ("Dhatura (Belladonna alkaloids - Atropine): anticholinergic toxidrome: 'Dry as a bone, Blind as a bat, Mad as a hatter, Red as a beet, Hot as a hare'; antidote = physostigmine.",
     "Anticholinergic: Dhatura/Belladonna; 5 clues: Dry bones + Blind bat + Mad hatter + Red beet + Hot hare; physostigmine = antidote"),
    ("Oleander poisoning: digoxin-like glycosides; yellow vision + cardiac arrhythmias; treat like digoxin toxicity (digoxin immune Fab); 'rosy yellow vision + heart block'.",
     "Oleander: cardiac glycoside plant; digoxin-like toxicity; bradycardia + heart block + yellow vision; digoxin immune Fab = antidote"),
  ]),
  ("Sexual Offences & Identification", [
    ("Examination in rape: within 72 hours ideally; DNA evidence degrades rapidly; 'Two-doctor examination' (male doctor + female doctor/nurse); collect swabs from vagina, anus, oral cavity.",
     "Rape examination: within 72h; two-doctor rule; collect swabs; note injuries; no finding does not exclude rape; hymen not definitive"),
    ("Virginity: intact hymen does NOT prove virginity; ruptured hymen does NOT prove sexual intercourse; medical opinion on sexual history is NOT part of rape medical report.",
     "Hymen: not diagnostic of virginity or rape; annular/fimbriated/cribriform = normal variants; old hymenal lacerations at 3,6,9 o'clock positions"),
    ("Age estimation from teeth: eruption times; Gustafson's method (6 features: attrition, secondary dentine, cementum apposition, root resorption, root transparency, periodontosis); Demirjian method (8 teeth scoring).",
     "Age from teeth: Gustafson 6 features; Demirjian 8-teeth scoring; wisdom tooth = 17-25yrs; root closure = best indicator in adults"),
    ("Age estimation from X-ray (bones): epiphyseal fusion; medial clavicle fusion = last to fuse (25-30 yrs); iliac crest (14-18 yrs); useful in legal age determination (<18, >21).",
     "Bone age: medial clavicle last to fuse (25-30); iliac crest 14-18; wrist X-ray = child age; epiphyseal fusion = timeline"),
    ("Putrefaction & identification: fingerprints (best method if preserved); dental records (most reliable for mass disasters); DNA (gold standard); facial reconstruction.",
     "ID methods: fingerprints = best (gloves of hands in putrefaction); dental = mass disaster; DNA = gold standard; skull-photo superimposition = Galton method"),
    ("Medico-legal importance of hair: bulb shape (scalp hair = club-shaped); medullary index (human <1/3; animal >1/2); racial characteristics; DNA from hair root.",
     "Hair: medullary index <1/3 human; >1/2 animal; club-shaped bulb = telogen; ABO antigens in hair (secretors)"),
  ]),
  ("Forensic Pathology - Special Topics", [
    ("Sudden natural death: MC cause = IHD (coronary artery disease); most occur at rest or mild exertion; acute MI may have NO gross findings in first 4-6 hours (rely on CK-MB, Troponin).",
     "Sudden death: MC = IHD; gross findings absent in first 4-6h of MI; CK-MB rises 4-6h; Troponin = most sensitive/specific"),
    ("Child abuse (Battered baby syndrome - Caffey's syndrome): multiple fractures at different stages of healing; subdural haematoma (shaken baby); retinal haemorrhages; bruises in unusual sites; spiral fractures.",
     "Battered child: multiple fractures in various stages; shaken baby = subdural + retinal haemorrhages; unusual bruise sites; spiral # extremities"),
    ("Road traffic accident (RTA) injuries: primary (direct impact) vs secondary (fall on road) vs tertiary (hitting stationary object); pedestrian = Waddell's triad (bumper # tibia/fibula + contralateral hip + head injury).",
     "RTA: Waddell's triad = pedestrian + bumper # leg + opposite hip fracture + head injury; primary=direct; secondary=fall; tertiary=thrown"),
    ("Burns: Rule of Nines (Wallace): head+neck=9%, each arm=9%, anterior trunk=18%, posterior trunk=18%, each leg=18%, perineum=1%; >15% adults/10% children = major burn.",
     "Rule of Nines: head=9; arm=9; each half trunk=18; leg=18; perineum=1%; Lund-Browder = more accurate for children"),
    ("Lightning injury: characteristic features = arborescent (Lichtenberg figure) burns = ferning pattern on skin; clothing torn; metallic objects magnetised; thunder struck = Keraunoparalysis.",
     "Lightning: Lichtenberg figures (ferning/arborescent burns) = pathognomonic; Keraunoparalysis = temporary paralysis; magnetised metal objects"),
  ]),
]

# ════════════════════════════════════════════════════════════════════
# Section colour assignments
# ════════════════════════════════════════════════════════════════════

SECTIONS = [
    ("ENT - Otorhinolaryngology",      ENT,         C_NAVY,       C_LIGHT_BLUE),
    ("Ophthalmology",                  OPHTHALMOLOGY, C_DEEP_TEAL,  C_LIGHT_TEAL),
    ("Forensic Medicine & Toxicology", FORENSIC,    C_CRIMSON,    C_LIGHT_ROSE),
]

# ════════════════════════════════════════════════════════════════════
# PAGE CALLBACKS
# ════════════════════════════════════════════════════════════════════

def on_page(canvas, doc):
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    canvas.restoreState()

# ════════════════════════════════════════════════════════════════════
# BUILD
# ════════════════════════════════════════════════════════════════════

def build_pdf():
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        OUTPUT_PATH,
        pagesize=A4,
        leftMargin=1.0*inch,
        rightMargin=1.0*inch,
        topMargin=0.9*inch,
        bottomMargin=0.85*inch,
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    S = make_styles()
    story = []

    # ── Cover page ─────────────────────────────────────────────────
    story.append(Spacer(1, 1.5*inch))

    cover_box_data = [[
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    story.append(Paragraph(
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    story.append(Paragraph(
        "ENT  |  Ophthalmology  |  Forensic Medicine & Toxicology",
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                       textColor=C_DEEP_TEAL, alignment=TA_CENTER, spaceAfter=6)))
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    story.append(Paragraph(
        "MBBS 2nd Year Para-Clinical Subjects",
        ParagraphStyle("ct3", fontName="Helvetica", fontSize=11,
                       textColor=C_DARK_GREY, alignment=TA_CENTER, spaceAfter=4)))
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    story.append(HRFlowable(width="80%", thickness=1.5, color=C_TEAL, spaceAfter=0.2*inch))
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        "Previous Year Topic-Wise  |  Memory Hooks Included",
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                       textColor=C_DARK_GREY, alignment=TA_CENTER, spaceAfter=4)))
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    # subject badges
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    story.append(Paragraph(
        f"Edition: 2026  |  Generated: {datetime.date.today().strftime('%B %d, %Y')}",
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    # ── Table of Contents ──────────────────────────────────────────
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    story.append(Paragraph("Table of Contents", S["toc_header"]))
    story.append(HRFlowable(width="100%", thickness=1, color=C_TEAL, spaceAfter=0.15*inch))

    toc_items = [
        ("ENT - Otorhinolaryngology", [
            "Ear Anatomy & Physiology",
            "Ear Diseases (CSOM, Cholesteatoma, Meniere's, BPPV, Acoustic Neuroma)",
            "Nose & Paranasal Sinuses",
            "Throat & Larynx",
            "Hearing & Audiology",
        ]),
        ("Ophthalmology", [
            "Anatomy of the Eye",
            "Refractive Errors & Cornea",
            "Glaucoma",
            "Cataract & Lens",
            "Retina (DR, AMD, RD, Retinoblastoma)",
            "Strabismus & Paediatric Ophthalmology",
            "Eyelids, Orbit & Lacrimal",
        ]),
        ("Forensic Medicine & Toxicology", [
            "Legal & Medical Jurisprudence",
            "Thanatology - Changes After Death",
            "Wounds & Injuries",
            "Asphyxia",
            "Forensic Toxicology",
            "Sexual Offences & Identification",
            "Forensic Pathology - Special Topics",
        ]),
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    # ── How to use ─────────────────────────────────────────────────
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            "<b>How to Use:</b>  Each entry has two parts — "
            "<b>bullet (left)</b> = the one-liner fact for NEET PG/USMLE/INSAT; "
            "<b>star (right)</b> = memory hook/mnemonic for rapid recall. "
            "Cover the right column and test yourself!",
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    usage_table = Table(usage_data, colWidths=[6.5*inch])
    usage_table.setStyle(TableStyle([
        ("BACKGROUND",    (0,0), (-1,-1), C_LIGHT_AMBER),
        ("TOPPADDING",    (0,0), (-1,-1), 8),
        ("BOTTOMPADDING", (0,0), (-1,-1), 8),
        ("LEFTPADDING",   (0,0), (-1,-1), 10),
        ("RIGHTPADDING",  (0,0), (-1,-1), 10),
        ("ROUNDEDCORNERS",[6,6,6,6]),
    ]))
    story.append(usage_table)

    # ── Subject sections ───────────────────────────────────────────
    for title, data, bg, light_bg in SECTIONS:
        add_section(story, title, bg, light_bg, data, S)

    # ── Build ──────────────────────────────────────────────────────
    doc.build(story, onFirstPage=on_page, onLaterPages=on_page)
    print(f"PDF created: {OUTPUT_PATH}")

if __name__ == "__main__":
    build_pdf()