[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10},"actionData","errors","root",{"_154":155,"_156":157},"routes/_app.x.$handle.$name",{"_94":93,"_32":45,"_102":84,"_27":103,"_13":14,"_104":-5,"_11":105,"_106":107,"_108":109,"_110":111,"_112":113,"_20":-5,"_114":-5,"_115":-5,"_116":25,"_117":118,"_119":120,"_121":-5,"_122":-5,"_123":124},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":-5,"_18":-5},"project",{"_43":44,"_32":45,"_38":46,"_47":-5,"_48":25,"_49":50,"_51":50,"_52":-5,"_53":-5,"_18":54,"_55":-5,"_56":25,"_57":-5,"_58":-5,"_59":60,"_61":62,"_63":-5,"_64":-5,"_65":-5,"_66":-5,"_67":68,"_69":68,"_70":71,"_72":71,"_73":71,"_74":68,"_75":68,"_76":77,"_78":79,"_80":81,"_82":25},"version",13,"changes",[19],"aiChatInfo","userId",{"_20":21,"_22":23,"_24":25,"_26":25,"_27":28,"_29":28},"file",{"_30":31,"_32":28,"_33":34,"_35":37,"_38":39,"_40":14,"_41":42,"_24":25},"previous",{"_30":31,"_32":28,"_33":34,"_35":36},"deleted",false,"deletedHere","path","new-file-7043.ts","latestPath","fileId","5525a66e-1829-11f1-8463-42dde27851f2","name","fileType","http","content","acic, Lumbar, Sacral\",\"Thoracic, Cervical, Sacral, Lumbar\",\"Sacral, Lumbar, Cervical, Thoracic\"], answer:1, exp:\"The spinal cord has four main regions from top (neck) to bottom (tailbone): Cervical (C1-C8, neck), Thoracic (T1-T12, chest), Lumbar (L1-L5, lower back), and Sacral (S1-S5, pelvis). Cervical injuries are most dangerous because they can affect breathing; lower injuries may paralyze the legs but leave arms functional.\" },\n { topic:\"Spinal Cord\", q:\"In the spinal cord, sensory (afferent) information enters through which root, and motor (efferent) commands exit through which root?\", choices:[\"Both enter and exit through the dorsal root\",\"Sensory enters via dorsal root; motor exits via ventral root\",\"Sensory enters via ventral root; motor exits via dorsal root\",\"Both enter and exit through the ventral root\"], answer:1, exp:\"This is Bell-Magendie's Law: sensory signals enter the spinal cord through the DORSAL (back) root, while motor commands exit through the VENTRAL (front) root. This elegant organization means that cutting the dorsal root causes loss of sensation, while cutting the ventral root causes paralysis — but each injury leaves the other function intact.\" },\n { topic:\"Spinal Cord\", q:\"Gray matter in the spinal cord contains neuron cell bodies. White matter contains myelinated axons. Where is the gray matter located in a cross-section of the spinal cord?\", choices:[\"On the outer edge, surrounding the white matter\",\"In a butterfly/H-shape in the center, surrounded by white matter\",\"Evenly distributed throughout\",\"Only in the dorsal half\"], answer:1, exp:\"In the spinal cord, gray matter (cell bodies) forms a characteristic butterfly or H-shaped core in the center, surrounded by white matter (myelinated axon tracts) on the outside. This is opposite to the brain's cortex, where gray matter is on the outside. The central canal (filled with CSF) runs through the middle of the H.\" },\n\n // ── Meninges & CSF ──\n { topic:\"Meninges & CSF\", q:\"The brain and spinal cord are protected by three layers of membranes called the meninges. From outermost to innermost, which is the correct order?\", choices:[\"Pia mater, Arachnoid, Dura mater\",\"Dura mater, Arachnoid, Pia mater\",\"Arachnoid, Dura mater, Pia mater\",\"Pia mater, Dura mater, Arachnoid\"], answer:1, exp:\"From outside in: Dura mater ('tough mother' — thick, leathery outer layer), Arachnoid mater (middle, web-like), and Pia mater ('gentle mother' — thin layer directly on the brain/cord). The subarachnoid space between the arachnoid and pia is filled with cerebrospinal fluid (CSF). Meningitis is inflammation of these membranes — very serious!\" },\n { topic:\"Meninges & CSF\", q:\"What is the primary function of cerebrospinal fluid (CSF)?\", choices:[\"To carry oxygen to neurons\",\"To cushion and protect the brain and spinal cord, and remove waste\",\"To produce myelin\",\"To carry electrical signals between hemispheres\"], answer:1, exp:\"CSF serves as a liquid shock absorber — it cushions the brain and spinal cord against physical impacts. It also removes metabolic waste products from the CNS (the brain essentially 'cleans itself' while you sleep via the glymphatic system using CSF flow). CSF is produced in the choroid plexus inside the brain's ventricles.\" },\n { topic:\"Meninges & CSF\", q:\"Meningitis is a dangerous medical emergency. What exactly becomes inflamed in meningitis?\", choices:[\"The neurons of the cerebral cortex\",\"The meninges (protective membranes around the brain and spinal cord)\",\"The myelin sheaths of peripheral nerves\",\"The corpus callosum\"], answer:1, exp:\"Meningitis is inflammation of the meninges — the three protective membranes around the brain and spinal cord. It's usually caused by a bacterial or viral infection. Symptoms include severe headache, fever, stiff neck, and sensitivity to light. Bacterial meningitis can be fatal within hours, making it a true medical emergency.\" },\n\n // ── Cranial Nerves ──\n { topic:\"Cranial Nerves\", q:\"How many pairs of cranial nerves arise directly from the brain?\", choices:[\"6 pairs\",\"10 pairs\",\"12 pairs\",\"14 pairs\"], answer:2, exp:\"There are exactly 12 pairs of cranial nerves (CN I–XII), numbered front to back. They emerge directly from the brain (mostly the brainstem) rather than the spinal cord. They handle sensory and motor functions for the head and neck — and cranial nerve X (vagus) extends all the way into the chest and abdomen.\" },\n { topic:\"Cranial Nerves\", q:\"The optic nerve (Cranial Nerve II) carries visual information from the eye to the brain. Where in the brain does this information ultimately get processed?\", choices:[\"Frontal lobe\",\"Temporal lobe\",\"Occipital lobe\",\"Parietal lobe\"], answer:2, exp:\"Visual signals travel from the retina via the optic nerve → optic chiasm (where signals from each eye partially cross) → lateral geniculate nucleus in the thalamus → primary visual cortex in the OCCIPITAL lobe. This long pathway is why occipital lobe damage causes visual loss, not eye damage.\" },\n { topic:\"Cranial Nerves\", q:\"The vagus nerve (Cranial Nerve X) is sometimes called the 'wandering nerve.' Why?\", choices:[\"It only functions during sleep\",\"It extends far beyond the head — reaching the heart, lungs, and digestive organs\",\"It crosses between the left and right hemispheres\",\"It only carries pain signals\"], answer:1, exp:\"The vagus nerve is the longest cranial nerve, 'wandering' from the brainstem all the way down to the abdomen. It carries parasympathetic signals to slow the heart, facilitate breathing, and regulate digestion. Stimulating the vagus nerve (deep breathing, cold water on the face) activates the 'rest and digest' response — a technique used to calm anxiety.\" },\n\n // ── Neurological Conditions ──\n { topic:\"Neurological Conditions\", q:\"Multiple sclerosis (MS) is a disease in which the immune system attacks the myelin sheaths of neurons in the CNS. What is the main effect on nerve signals?\", choices:[\"Signals become faster\",\"Signals become slower or are blocked entirely\",\"More neurotransmitters are produced\",\"The brain grows additional neurons\"], answer:1, exp:\"Myelin acts as insulation that speeds up nerve conduction. When MS destroys myelin (demyelination), signals slow dramatically or fail to reach their destination. Symptoms depend on which nerves are affected — they can include blurred vision, muscle weakness, numbness, and coordination problems. MS is unpredictable because different areas of myelin are affected at different times.\" },\n { topic:\"Neurological Conditions\", q:\"Parkinson's disease involves the loss of neurons that produce which neurotransmitter, leading to tremors and difficulty moving?\", choices:[\"Serotonin\",\"Acetylcholine\",\"Dopamine\",\"GABA\"], answer:2, exp:\"Parkinson's disease results from the progressive death of dopamine-producing neurons in a brain region called the substantia nigra. Without dopamine, the basal ganglia (which coordinates smooth movement) malfunction, causing the characteristic resting tremors, rigidity, and slow movements. Levodopa (a dopamine precursor) is the main treatment, but it doesn't cure the disease.\" },\n { topic:\"Neurological Conditions\", q:\"A stroke occurs when blood flow to part of the brain is cut off. Why is time so critical in treating a stroke?\", choices:[\"Because the brain overheats quickly\",\"Because neurons begin dying within minutes without oxygen, causing permanent damage\",\"Because strokes are always contagious\",\"Because the spinal cord controls emergency repair systems\"], answer:1, exp:\"The brain is extraordinarily sensitive to oxygen deprivation — neurons can begin dying within 4-6 minutes of losing blood flow. The phrase in stroke medicine is 'time is brain' — every minute of delay costs roughly 1.9 million neurons. This is why the clot-busting drug tPA must be given within hours of stroke onset to be effective.\" },\n { topic:\"Neurological Conditions\", q:\"Epilepsy is characterized by recurrent seizures. What happens in the brain during a seizure?\", choices:[\"Neurons stop firing entirely\",\"A massive, uncontrolled burst of electrical activity spreads through the brain\",\"Cerebrospinal fluid drains rapidly\",\"The corpus callosum disconnects\"], answer:1, exp:\"Seizures occur when there's a sudden, synchronized, abnormal electrical discharge from a group of neurons that can spread across the brain. The type of seizure depends on where it starts and how far it spreads. Epilepsy treatment (anticonvulsant medications) works by reducing abnormal neuronal excitability — often by enhancing GABA or blocking sodium channels.\" },\n\n // ── Nervous System Development ──\n { topic:\"NS Development\", q:\"The nervous system develops from a structure called the neural tube. Which embryonic tissue layer does the neural tube develop from?\", choices:[\"Endoderm\",\"Mesoderm\",\"Ectoderm\",\"Trophoblast\"], answer:2, exp:\"The neural tube — which eventually becomes the brain and spinal cord — develops from the ectoderm (the outermost layer of the embryo) in a process called neurulation. Failure of the neural tube to close properly causes neural tube defects like spina bifida and anencephaly. Folic acid (vitamin B9) reduces the risk of these defects, which is why it's recommended during pregnancy.\" },\n { topic:\"NS Development\", q:\"Neuroplasticity refers to the brain's ability to change and reorganize. Which period of life is the brain MOST plastic (most able to change)?\", choices:[\"Ages 40-60\",\"Late adulthood\",\"Early childhood and infancy\",\"Only after brain injury\"], answer:2, exp:\"The brain is most plastic during early childhood — this is when trillions of synaptic connections are formed and refined based on experience. The brain produces far more synapses than it needs, then 'prunes' unused ones in a 'use it or lose it' process. This is why early experiences, learning languages, and musical training have such lasting effects.\" },\n { topic:\"NS Development\", q:\"'Synaptic pruning' is a normal process in brain development. What does it involve?\", choices:[\"Repairing damaged myelin sheaths\",\"Eliminating unused synaptic connections to make the remaining ones more efficient\",\"Creating new neurons from stem cells\",\"Thickening the corpus callosum\"], answer:1, exp:\"Synaptic pruning is the brain's way of becoming more efficient — it removes synaptic connections that are rarely used ('use it or lose it') while strengthening frequently used ones. This process is especially active in adolescence as the prefrontal cortex matures. It's thought that abnormal pruning may contribute to conditions like schizophrenia and autism.\" },\n\n // ── Reflexes (Advanced) ──\n { topic:\"Reflexes\", q:\"A doctor taps your knee with a rubber hammer and your leg kicks forward involuntarily. This is the patellar (knee-jerk) reflex. It is an example of a monosynaptic reflex — what does 'monosynaptic' mean?\", choices:[\"The reflex involves only one muscle\",\"The signal only passes through one synapse between sensory and motor neurons\",\"The reflex requires conscious thought\",\"The signal travels through the brain first\"], answer:1, exp:\"'Monosynaptic' means the reflex arc contains only ONE synapse — directly between a sensory (afferent) neuron and a motor (efferent) neuron, with no interneurons in between. This makes it extremely fast. The stretch receptor in the quadriceps muscle sends a signal directly to the motor neuron that contracts the muscle, causing the leg to kick.\" },\n { topic:\"Reflexes\", q:\"The withdrawal reflex (pulling your hand from pain) is a POLYSYNAPTIC reflex. Compared to the monosynaptic knee-jerk reflex, polysynaptic reflexes:\", choices:[\"Are faster because they involve more neurons\",\"Are processed in the brain, not the spinal cord\",\"Involve interneurons in the spinal cord and affect multiple muscles\",\"Only occur in the legs\"], answer:2, exp:\"Polysynaptic reflexes involve interneurons in the spinal cord that coordinate responses across multiple muscles — for example, when you withdraw one hand from heat, the opposite arm often extends to maintain balance. Though processed in the spinal cord (not brain), they're slightly slower than monosynaptic reflexes due to multiple synaptic delays.\" },\n\n // ── Advanced Brain ──\n { topic:\"Advanced Brain\", q:\"Broca's area and Wernicke's area are both involved in language. Which best describes their different roles?\", choices:[\"Broca's produces speech; Wernicke's comprehends language\",\"Broca's comprehends language; Wernicke's produces speech\",\"Both produce speech equally\",\"Both comprehend language equally\"], answer:0, exp:\"Broca's area (frontal lobe) is responsible for speech PRODUCTION — damage causes Broca's aphasia, where patients understand language but speak haltingly with great effort. Wernicke's area (temporal lobe) handles language COMPREHENSION — damage causes Wernicke's aphasia, where patients speak fluently but say nonsensical things and can't understand what others say.\" },\n { topic:\"Advanced Brain\", q:\"The corpus callosum is a large bundle of nerve fibers. What is its primary function?\", choices:[\"Regulating breathing\",\"Connecting the left and right hemispheres of the cerebrum to share information\",\"Producing cerebrospinal fluid\",\"Controlling the gag reflex\"], answer:1, exp:\"The corpus callosum contains about 200-250 million axons and is the main communication highway between the left and right cerebral hemispheres. When it's surgically cut (as a treatment for severe epilepsy), patients develop 'split-brain syndrome' — the two hemispheres can no longer share information, leading to fascinating perceptual disconnects studied by neuroscientist Roger Sperry.\" },\n { topic:\"Advanced Brain\", q:\"The amygdala plays a key role in processing which emotion in particular?\", choices:[\"Happiness\",\"Disgust\",\"Fear and threat detection\",\"Boredom\"], answer:2, exp:\"The amygdala (almond-shaped structure in the limbic system) is the brain's alarm system — it rapidly detects potential threats and triggers the fight-or-flight response via the hypothalamus. It works so fast it can activate fear responses before the cortex has consciously registered the danger. PTSD is thought to involve an overactive amygdala, which is why trauma victims have strong fear responses to certain triggers.\" },\n { topic:\"Advanced Brain\", q:\"What does the prefrontal cortex (PFC) — the front part of the frontal lobe — primarily do?\", choices:[\"Process color vision\",\"Control executive functions: reasoning, impulse control, and long-term planning\",\"Regulate body temperature\",\"Detect pain signals\"], answer:1, exp:\"The prefrontal cortex is what makes humans uniquely capable of complex thought. It handles executive functions — planning for the future, weighing consequences, controlling impulses, and understanding social rules. Critically, the PFC isn't fully mature until age 25, which helps explain why teenagers tend to take more risks (their impulse control system is still under construction).\" },\n\n // ── Advanced Sensory / Physiology ──\n { topic:\"Advanced Senses\", q:\"When light enters the eye and hits the retina, rods and cones convert it into electrical signals through a process involving light-sensitive proteins. What is the protein in RODS called?\", choices:[\"Melanopsin\",\"Rhodopsin\",\"Iodopsin\",\"Opsin-3\"], answer:1, exp:\"Rhodopsin is the light-sensitive pigment in rod cells. It's made of a protein (opsin) bound to retinal (a vitamin A derivative). When light hits rhodopsin, retinal changes shape, triggering a cascade of reactions that generate a nerve signal. Because rhodopsin is very sensitive to light, rods excel in dim conditions. Vitamin A deficiency can cause night blindness by reducing rhodopsin production.\" },\n { topic:\"Advanced Senses\", q:\"The perception of pain is processed by which part of the brain?\", choices:[\"Cerebellum\",\"Occipital lobe\",\"Somatosensory cortex (parietal lobe) and anterior cingulate cortex\",\"Only the spinal cord\"], answer:2, exp:\"Pain has two components processed in different brain regions: the 'ouch' — the physical location and intensity — is processed in the somatosensory cortex (parietal lobe); the 'suffering' — the emotional unpleasantness — is processed in the anterior cingulate cortex (part of the limbic system). This is why chronic pain has both physical and emotional dimensions, and why pain can be influenced by mood and attention.\" },\n { topic:\"Advanced Senses\", q:\"Phantom limb pain occurs in some amputees, where they feel pain in a limb that no longer exists. What does this demonstrate about pain perception?\", choices:[\"That pain is only physical and located in tissues\",\"That pain is entirely constructed by the brain, not just a signal from the body\",\"That the nervous system cannot adapt\",\"That the spinal cord stores memories\"], answer:1, exp:\"Phantom limb pain powerfully demonstrates that pain is ultimately a brain construction, not just a signal from the body. The somatosensory cortex has a 'map' of the body — after amputation, that cortical area remains active and can generate pain signals in the 'absence' of the limb. Mirror therapy (where a mirror tricks the brain into seeing the missing limb) can actually reduce phantom pain — further proof the brain constructs our perception of reality.\" },\n\n // ── The Blood-Brain Barrier ──\n { topic:\"Blood-Brain Barrier\", q:\"The blood-brain barrier (BBB) is a specialized filtering system. What is its primary purpose?\", choices:[\"To supply extra oxygen to neurons\",\"To prevent harmful substances in the blood from entering the brain while allowing essential nutrients through\",\"To regulate body temperature\",\"To connect the blood to the cerebrospinal fluid directly\"], answer:1, exp:\"The BBB is formed by tightly connected endothelial cells lining brain capillaries, supported by astrocytes (a type of glial cell). It blocks bacteria, many toxins, and most large molecules, while allowing glucose, oxygen, and small lipid-soluble molecules through. This protection is invaluable but also a challenge for drug delivery — many potential brain medications can't cross the BBB effectively.\" },\n { topic:\"Blood-Brain Barrier\", q:\"Which type of brain cell — NOT a neuron — supports the blood-brain barrier, helps clean up waste, and provides structural support to neurons?\", choices:[\"Schwann cells\",\"Oligodendrocytes\",\"Astrocytes\",\"Microglia\"], answer:2, exp:\"Astrocytes are star-shaped glial cells (non-neuronal brain cells) that perform incredible support functions: they help form the BBB, regulate neurotransmitter levels, provide nutrients to neurons, and help with synaptic formation. The brain is roughly 50% glial cells — they were long thought to be mere 'packing material' but are now known to be essential partners of neurons.\" },\n\n // ── Nervous System Integration ──\n { topic:\"Integration\", q:\"When you practice a skill repeatedly (like a piano scale), which brain process makes your performance smoother and more automatic over time?\", choices:[\"Neurogenesis — growing new neurons\",\"Long-term potentiation — strengthening frequently used synaptic connections\",\"Synaptic pruning — removing all connections not used\",\"Myelination of the corpus callosum only\"], answer:1, exp:\"Long-term potentiation (LTP) is the cellular basis of learning and memory — when two neurons fire together repeatedly, the synapse between them becomes stronger and more efficient ('neurons that fire together, wire together'). Skill practice also causes the cerebellum and basal ganglia to take over from the cortex, making the skill more automatic and requiring less conscious effort.\" },\n { topic:\"Integration\", q:\"The enteric nervous system is sometimes called the 'second brain.' Where is it located?\", choices:[\"Inside the spinal cord\",\"In the lining of the gastrointestinal (digestive) tract\",\"In the brainstem\",\"Behind the eyes\"], answer:1, exp:\"The enteric nervous system (ENS) is a massive network of about 500 million neurons embedded in the walls of the digestive tract. It can function independently of the brain and spinal cord — controlling digestion, gut movements, and even producing 95% of the body's serotonin. The gut-brain axis (communication between ENS and brain) is a hot research area, with evidence that gut bacteria influence mood and mental health.\" },\n { topic:\"Integration\", q:\"During REM (Rapid Eye Movement) sleep, the brain is highly active. Which cognitive process is most strongly associated with REM sleep?\", choices:[\"Formation of new motor skills only\",\"Consolidation of emotional memories and creative problem-solving\",\"Regulation of body temperature\",\"Repair of the blood-brain barrier\"], answer:1, exp:\"REM sleep — characterized by vivid dreams and rapid eye movements — plays a crucial role in emotional memory consolidation and creative insight. The hippocampus and amygdala are very active during REM. Studies show that REM sleep helps integrate new information with existing memories and can produce novel solutions to problems (the 'sleep on it' phenomenon is real!).\" },\n { topic:\"Integration\", q:\"Which of the following best explains why stress can impair memory and learning?\", choices:[\"Stress increases GABA, which blocks all neurotransmitters\",\"Chronic stress releases cortisol, which can damage the hippocampus over time\",\"Stress causes the cerebellum to shrink\",\"Stress blocks myelination of new neurons\"], answer:1, exp:\"The stress hormone cortisol is helpful in short bursts (it sharpens attention). But chronically elevated cortisol is neurotoxic — it can damage and even shrink the hippocampus, the key memory-formation structure. This is why chronic stress impairs learning, working memory, and can contribute to depression. Exercise and sleep help lower cortisol and protect the hippocampus.\" },\n { topic:\"Integration\", q:\"The spinothalamic tract is a major ascending pathway in the spinal cord. What type of information does it carry?\", choices:[\"Motor commands from the brain to muscles\",\"Sensory signals for pain, temperature, and crude touch from the body to the brain\",\"Visual information from the eyes\",\"Proprioceptive signals from joints and tendons only\"], answer:1, exp:\"The spinothalamic tract is an ascending (going UP toward the brain) pathway that carries pain, temperature, and crude touch signals from the body to the thalamus, which relays them to the somatosensory cortex. It crosses to the opposite side of the spinal cord shortly after entering — which is why right-side body pain is processed in the left hemisphere, and vice versa.\" },\n { topic:\"Integration\", q:\"The corticospinal tract is the main DESCENDING motor pathway. Damage to it above the spinal cord causes what type of paralysis?\", choices:[\"Flaccid (floppy) paralysis with no muscle tone\",\"Spastic paralysis with increased muscle tone and exaggerated reflexes\",\"Only sensory loss, no motor effects\",\"Paralysis only of the face\"], answer:1, exp:\"Damage to the corticospinal (pyramidal) tract above the spinal cord — like in a stroke — causes UPPER motor neuron (UMN) signs: spastic paralysis (stiff, tight muscles), increased muscle tone, exaggerated deep tendon reflexes, and the Babinski sign (big toe extends upward). This is different from LOWER motor neuron damage (at the spinal cord or peripheral nerves), which causes flaccid, floppy paralysis.\" },\n { topic:\"Integration\", q:\"Alice wants to catch a ball. She sees it coming (visual cortex), decides to catch it (frontal lobe), and her arm moves toward it. Which brain structure coordinates the precise timing and smoothness of her arm movement?\", choices:[\"Hippocampus\",\"Amygdala\",\"Cerebellum\",\"Hypothalamus\"], answer:2, exp:\"The cerebellum acts as the brain's movement coordinator — it receives plans from the motor cortex and sensory feedback from muscles and joints, then fine-tunes motor commands in real time to make movements precise and smooth. Without the cerebellum, movements become jerky and miss their targets (a condition called ataxia). Elite athletes have highly trained cerebellums.\" },\n { topic:\"Integration\", q:\"Isaac's body temperature drops while he's outside in the cold. Which part of the brain detects this change and triggers shivering and vasoconstriction to warm him up?\", choices:[\"Hippocampus\",\"Occipital lobe\",\"Hypothalamus\",\"Thalamus\"], answer:2, exp:\"The hypothalamus is the body's thermostat. It contains temperature-sensitive neurons that detect blood temperature changes. When the body gets cold, it triggers shivering (muscle contractions generate heat), vasoconstriction (blood vessels narrow to reduce heat loss at the skin), and behavioral responses (feeling cold so you put on a coat). When hot, it triggers sweating and vasodilation.\" }\n];\n\n// ══════════════════════════════════════════════\n// STATE\n// ══════════════════════════════════════════════\nlet activeRound = 1;\nlet activeQuestions = [];\nlet currentQ = 0;\nlet score = 0;\nlet answered = false;\nlet timerInterval = null;\nlet secondsLeft = 30 * 60;\n\n// ══════════════════════════════════════════════\n// NAVIGATION\n// ══════════════════════════════════════════════\nfunction goToR1Start() {\n document.body.classList.remove('r2');\n hideAll();\n document.getElementById('r1-start').classList.remove('hidden');\n document.getElementById('header-badge').textContent = 'Science Olympiad · Division A · 2025–2026';\n document.getElementById('header-title').innerHTML = 'Nervous System
Challenge';\n document.getElementById('header-sub').textContent = 'A personalised practice test to help prepare for the Anatomy event.';\n window.scrollTo({top:0,behavior:'smooth'});\n}\n\nfunction goToR2Start() {\n document.body.classList.add('r2');\n hideAll();\n document.getElementById('r2-start').classList.remove('hidden');\n document.getElementById('header-badge').textContent = 'Round 2 · Advanced Level';\n document.getElementById('header-title').innerHTML = 'Nervous System
Round 2 ⚡';\n document.getElementById('header-sub').textContent = 'Harder questions, new topics — level up your knowledge!';\n window.scrollTo({top:0,behavior:'smooth'});\n}\n\nfunction hideAll() {\n ['r1-start','r2-start','quiz-screen','results-screen'].forEach(id => {\n document.getElementById(id).classList.add('hidden');\n });\n}\n\n// ══════════════════════════════════════════════\n// QUIZ ENGINE\n// ══════════════════════════════════════════════\nfunction startQuiz(round) {\n activeRound = round;\n activeQuestions = round === 1 ? 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Diff · v13