feat(secondary): apply primary visual design to secondary school detail

- GCSE top metrics (Att8, P8, Eng+Maths 4+/5+) promoted to heroStatCard
  teal-tinted cards with Playfair serif values and DeltaChip vs national
- Attainment 8 visual bar: 0–80 scale with coral national-average marker
  and pill label, mirrors the SatsChart concept for a score metric
- Progress 8 number line: −3 to +3 axis showing CI band, zero baseline,
  and a teal/coral dot for the school's score (hidden when P8 suspended)
- SEN section upgraded from plain metricCard to heroStatCard grid
- History table moved into a details/summary accordion (collapsed by
  default); PerformanceChart now lives at the top of the History section
  always visible above the disclosure

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

nextjs-app/components/SecondarySchoolDetailView.tsx

@@ -494,61 +494,153 @@ export function SecondarySchoolDetailView({
             </div>
           )}
 
-          <div className={styles.metricsGrid}>
+          {/* Hero stat cards — top GCSE metrics */}
+          <div className={styles.heroStatGrid}>
             {latestResults.attainment_8_score != null && (
-              <div className={styles.metricCard}>
-                <div className={styles.metricLabel}>
-                  Attainment 8
+              <div className={styles.heroStatCard}>
+                <div className={styles.heroStatLabel}>
+                  Attainment 8 score
                   <MetricTooltip metricKey="attainment_8_score" />
                 </div>
-                <div className={styles.metricValue}>{latestResults.attainment_8_score.toFixed(1)}</div>
+                <div className={styles.heroStatValue}>
+                  {latestResults.attainment_8_score.toFixed(1)}
+                  {secondaryAvg.attainment_8_score != null && (
+                    <DeltaChip
+                      value={latestResults.attainment_8_score}
+                      baseline={secondaryAvg.attainment_8_score}
+                      unit="pts"
+                      size="sm"
+                    />
+                  )}
+                </div>
                 {secondaryAvg.attainment_8_score != null && (
-                  <div className={styles.metricHint}>National avg: {secondaryAvg.attainment_8_score.toFixed(1)}</div>
+                  <div className={styles.heroStatHint}>National avg: {secondaryAvg.attainment_8_score.toFixed(1)}</div>
                 )}
               </div>
             )}
             {latestResults.progress_8_score != null && (
-              <div className={styles.metricCard}>
-                <div className={styles.metricLabel}>
-                  Progress 8
+              <div className={styles.heroStatCard}>
+                <div className={styles.heroStatLabel}>
+                  Progress 8 score
                   <MetricTooltip metricKey="progress_8_score" />
                 </div>
-                <div className={`${styles.metricValue} ${progressClass(latestResults.progress_8_score, styles)}`}>
+                <div className={`${styles.heroStatValue} ${progressClass(latestResults.progress_8_score, styles)}`}>
                   {formatProgress(latestResults.progress_8_score)}
                 </div>
-                {(latestResults.progress_8_lower_ci != null || latestResults.progress_8_upper_ci != null) && (
-                  <div className={styles.metricHint}>
-                    CI: {latestResults.progress_8_lower_ci?.toFixed(2) ?? '?'} to {latestResults.progress_8_upper_ci?.toFixed(2) ?? '?'}
+                {(latestResults.progress_8_lower_ci != null && latestResults.progress_8_upper_ci != null) ? (
+                  <div className={styles.heroStatHint}>
+                    CI: {latestResults.progress_8_lower_ci.toFixed(2)} to {latestResults.progress_8_upper_ci.toFixed(2)}
                   </div>
-                )}
-              </div>
-            )}
-            {latestResults.english_maths_standard_pass_pct != null && (
-              <div className={styles.metricCard}>
-                <div className={styles.metricLabel}>
-                  English &amp; Maths Grade 4+
-                  <MetricTooltip metricKey="english_maths_standard_pass_pct" />
-                </div>
-                <div className={styles.metricValue}>{formatPercentage(latestResults.english_maths_standard_pass_pct)}</div>
-                {secondaryAvg.english_maths_standard_pass_pct != null && (
-                  <div className={styles.metricHint}>National avg: {secondaryAvg.english_maths_standard_pass_pct.toFixed(0)}%</div>
+                ) : (
+                  <div className={styles.heroStatHint}>National baseline: 0.0</div>
                 )}
               </div>
             )}
             {latestResults.english_maths_strong_pass_pct != null && (
-              <div className={styles.metricCard}>
-                <div className={styles.metricLabel}>
+              <div className={styles.heroStatCard}>
+                <div className={styles.heroStatLabel}>
                   English &amp; Maths Grade 5+
                   <MetricTooltip metricKey="english_maths_strong_pass_pct" />
                 </div>
-                <div className={styles.metricValue}>{formatPercentage(latestResults.english_maths_strong_pass_pct)}</div>
+                <div className={styles.heroStatValue}>
+                  {formatPercentage(latestResults.english_maths_strong_pass_pct)}
+                  {secondaryAvg.english_maths_strong_pass_pct != null && (
+                    <DeltaChip
+                      value={latestResults.english_maths_strong_pass_pct}
+                      baseline={secondaryAvg.english_maths_strong_pass_pct}
+                      unit="pts"
+                      size="sm"
+                    />
+                  )}
+                </div>
                 {secondaryAvg.english_maths_strong_pass_pct != null && (
-                  <div className={styles.metricHint}>National avg: {secondaryAvg.english_maths_strong_pass_pct.toFixed(0)}%</div>
+                  <div className={styles.heroStatHint}>National avg: {secondaryAvg.english_maths_strong_pass_pct.toFixed(0)}%</div>
+                )}
+              </div>
+            )}
+            {latestResults.english_maths_standard_pass_pct != null && (
+              <div className={styles.heroStatCard}>
+                <div className={styles.heroStatLabel}>
+                  English &amp; Maths Grade 4+
+                  <MetricTooltip metricKey="english_maths_standard_pass_pct" />
+                </div>
+                <div className={styles.heroStatValue}>
+                  {formatPercentage(latestResults.english_maths_standard_pass_pct)}
+                  {secondaryAvg.english_maths_standard_pass_pct != null && (
+                    <DeltaChip
+                      value={latestResults.english_maths_standard_pass_pct}
+                      baseline={secondaryAvg.english_maths_standard_pass_pct}
+                      unit="pts"
+                      size="sm"
+                    />
+                  )}
+                </div>
+                {secondaryAvg.english_maths_standard_pass_pct != null && (
+                  <div className={styles.heroStatHint}>National avg: {secondaryAvg.english_maths_standard_pass_pct.toFixed(0)}%</div>
                 )}
               </div>
             )}
           </div>
 
+          {/* Attainment 8 visual bar (0–80 scale) */}
+          {latestResults.attainment_8_score != null && (
+            <div className={styles.att8Viz}>
+              <div className={styles.att8VizLabel}>Attainment 8 — school vs national</div>
+              <div className={styles.att8VizTrack}>
+                <div
+                  className={styles.att8VizFill}
+                  style={{ width: `${Math.min((latestResults.attainment_8_score / 80) * 100, 100)}%` }}
+                />
+                {secondaryAvg.attainment_8_score != null && (
+                  <div
+                    className={styles.att8VizNatLine}
+                    style={{ left: `${(secondaryAvg.attainment_8_score / 80) * 100}%` }}
+                  >
+                    <div className={styles.att8VizNatPill}>
+                      Nat avg {secondaryAvg.attainment_8_score.toFixed(1)}
+                    </div>
+                  </div>
+                )}
+              </div>
+              <div className={styles.att8VizTicks}>
+                <span>0</span><span>20</span><span>40</span><span>60</span><span>80</span>
+              </div>
+            </div>
+          )}
+
+          {/* Progress 8 number line with CI */}
+          {latestResults.progress_8_score != null && !p8Suspended && (
+            <div className={styles.p8Viz}>
+              <div className={styles.p8VizLabel}>Progress 8 — relative to national baseline (0)</div>
+              {(() => {
+                const p8 = latestResults.progress_8_score!;
+                const lo = latestResults.progress_8_lower_ci ?? p8;
+                const hi = latestResults.progress_8_upper_ci ?? p8;
+                const range = 6; // −3 to +3
+                const toX = (v: number) => `${Math.min(Math.max(((v + 3) / range) * 100, 0), 100)}%`;
+                return (
+                  <div className={styles.p8VizTrack}>
+                    {/* CI band */}
+                    <div
+                      className={styles.p8VizCi}
+                      style={{ left: toX(lo), width: `calc(${toX(hi)} - ${toX(lo)})` }}
+                    />
+                    {/* Zero line */}
+                    <div className={styles.p8VizZero} style={{ left: toX(0) }} />
+                    {/* Score dot */}
+                    <div
+                      className={`${styles.p8VizDot} ${p8 < 0 ? styles.p8VizDotNeg : ''}`}
+                      style={{ left: toX(p8) }}
+                    />
+                  </div>
+                );
+              })()}
+              <div className={styles.p8VizTicks}>
+                <span>−3</span><span>−2</span><span>−1</span><span>0</span><span>+1</span><span>+2</span><span>+3</span>
+              </div>
+            </div>
+          )}
+
           {/* Progress 8 component breakdown */}
           {(latestResults.progress_8_english != null || latestResults.progress_8_maths != null ||
             latestResults.progress_8_ebacc != null || latestResults.progress_8_open != null) && (
@@ -608,21 +700,6 @@ export function SecondarySchoolDetailView({
             </>
           )}
 
-          {/* Performance chart */}
-          {yearlyData.length > 0 && (
-            <>
-              <h3 className={styles.subSectionTitle} style={{ marginTop: '1.25rem' }}>Results Over Time</h3>
-              <div className={styles.chartContainer}>
-                <PerformanceChart
-                  data={yearlyData}
-                  schoolName={schoolInfo.school_name}
-                  isSecondary={true}
-                  nationalAtt8Avg={heroAtt8Nat}
-                  nationalByYear={nationalAvg?.by_year}
-                />
-              </div>
-            </>
-          )}
         </section>
       )}
 
@@ -695,33 +772,33 @@ export function SecondarySchoolDetailView({
           {(latestResults?.sen_support_pct != null || latestResults?.sen_ehcp_pct != null) && (
             <>
               <h3 className={styles.subSectionTitle}>Special Educational Needs (SEN)</h3>
-              <div className={styles.metricsGrid}>
+              <div className={styles.heroStatGrid}>
                 {latestResults?.sen_support_pct != null && (
-                  <div className={styles.metricCard}>
-                    <div className={styles.metricLabel}>
-                      Pupils receiving SEN support
+                  <div className={styles.heroStatCard}>
+                    <div className={styles.heroStatLabel}>
+                      SEN support
                       <MetricTooltip metricKey="sen_support_pct" />
                     </div>
-                    <div className={styles.metricValue}>{formatPercentage(latestResults.sen_support_pct)}</div>
-                    <div className={styles.metricHint}>SEN support without an EHCP</div>
+                    <div className={styles.heroStatValue}>{formatPercentage(latestResults.sen_support_pct)}</div>
+                    <div className={styles.heroStatHint}>Without an EHCP</div>
                   </div>
                 )}
                 {latestResults?.sen_ehcp_pct != null && (
-                  <div className={styles.metricCard}>
-                    <div className={styles.metricLabel}>
-                      Pupils with an EHCP
+                  <div className={styles.heroStatCard}>
+                    <div className={styles.heroStatLabel}>
+                      Pupils with EHCP
                       <MetricTooltip metricKey="sen_ehcp_pct" />
                     </div>
-                    <div className={styles.metricValue}>{formatPercentage(latestResults.sen_ehcp_pct)}</div>
-                    <div className={styles.metricHint}>Education, Health and Care Plan</div>
+                    <div className={styles.heroStatValue}>{formatPercentage(latestResults.sen_ehcp_pct)}</div>
+                    <div className={styles.heroStatHint}>Education, Health and Care Plan</div>
                   </div>
                 )}
                 {(schoolInfo.total_pupils != null || latestResults?.total_pupils != null) && (
-                  <div className={styles.metricCard}>
-                    <div className={styles.metricLabel}>Total pupils</div>
-                    <div className={styles.metricValue}>{(schoolInfo.total_pupils ?? latestResults!.total_pupils!).toLocaleString()}</div>
+                  <div className={styles.heroStatCard}>
+                    <div className={styles.heroStatLabel}>Total pupils</div>
+                    <div className={styles.heroStatValue}>{(schoolInfo.total_pupils ?? latestResults!.total_pupils!).toLocaleString()}</div>
                     {schoolInfo.capacity != null && (
-                      <div className={styles.metricHint}>Capacity: {schoolInfo.capacity}</div>
+                      <div className={styles.heroStatHint}>Capacity: {schoolInfo.capacity}</div>
                     )}
                   </div>
                 )}
@@ -808,30 +885,47 @@ export function SecondarySchoolDetailView({
       {yearlyData.length > 1 && (
         <section id="history" className={styles.card}>
           <h2 className={styles.sectionTitle}>Historical Results</h2>
-          <div className={styles.tableWrapper}>
-            <table className={styles.dataTable}>
-              <thead>
-                <tr>
-                  <th>Year</th>
-                  <th>Attainment 8</th>
-                  <th>Progress 8</th>
-                  <th>Eng &amp; Maths 4+</th>
-                  <th>EBacc entry %</th>
-                </tr>
-              </thead>
-              <tbody>
-                {yearlyData.map((result) => (
-                  <tr key={result.year}>
-                    <td className={styles.yearCell}>{formatAcademicYear(result.year)}</td>
-                    <td>{result.attainment_8_score != null ? result.attainment_8_score.toFixed(1) : '-'}</td>
-                    <td>{result.progress_8_score != null ? formatProgress(result.progress_8_score) : '-'}</td>
-                    <td>{result.english_maths_standard_pass_pct != null ? formatPercentage(result.english_maths_standard_pass_pct) : '-'}</td>
-                    <td>{result.ebacc_entry_pct != null ? formatPercentage(result.ebacc_entry_pct) : '-'}</td>
+          {yearlyData.length > 0 && (
+            <>
+              <h3 className={styles.subSectionTitle} style={{ marginTop: '1.25rem' }}>Results Over Time</h3>
+              <div className={styles.chartContainer}>
+                <PerformanceChart
+                  data={yearlyData}
+                  schoolName={schoolInfo.school_name}
+                  isSecondary={true}
+                  nationalAtt8Avg={heroAtt8Nat}
+                  nationalByYear={nationalAvg?.by_year}
+                />
+              </div>
+            </>
+          )}
+          <details className={styles.historyDisclosure}>
+            <summary className={styles.historyToggle}>View raw year-by-year data</summary>
+            <div className={styles.tableWrapper}>
+              <table className={styles.dataTable}>
+                <thead>
+                  <tr>
+                    <th>Year</th>
+                    <th>Attainment 8</th>
+                    <th>Progress 8</th>
+                    <th>Eng &amp; Maths 4+</th>
+                    <th>EBacc entry %</th>
                   </tr>
-                ))}
-              </tbody>
-            </table>
-          </div>
+                </thead>
+                <tbody>
+                  {yearlyData.map((result) => (
+                    <tr key={result.year}>
+                      <td className={styles.yearCell}>{formatAcademicYear(result.year)}</td>
+                      <td>{result.attainment_8_score != null ? result.attainment_8_score.toFixed(1) : '-'}</td>
+                      <td>{result.progress_8_score != null ? formatProgress(result.progress_8_score) : '-'}</td>
+                      <td>{result.english_maths_standard_pass_pct != null ? formatPercentage(result.english_maths_standard_pass_pct) : '-'}</td>
+                      <td>{result.ebacc_entry_pct != null ? formatPercentage(result.ebacc_entry_pct) : '-'}</td>
+                    </tr>
+                  ))}
+                </tbody>
+              </table>
+            </div>
+          </details>
         </section>
       )}
     </div>