diff --git a/src/App.css b/src/App.css
index f90339d..a541039 100644
--- a/src/App.css
+++ b/src/App.css
@@ -1,184 +1,591 @@
-.counter {
-  font-size: 16px;
-  padding: 5px 10px;
-  border-radius: 5px;
-  color: var(--accent);
-  background: var(--accent-bg);
-  border: 2px solid transparent;
-  transition: border-color 0.3s;
+:root {
+  --surface: #f4f4f6;
+  --surface-hover: #ededf0;
+
+  --danger-bg: #fff5f5;
+  --danger-border: #fecaca;
+  --danger-header: #fee2e2;
+  --danger-text: #991b1b;
+
+  --warning-bg: #fffbeb;
+  --warning-border: #fde68a;
+  --warning-header: #fef3c7;
+  --warning-text: #92400e;
+
+  --info-bg: #f0f9ff;
+  --info-border: #bae6fd;
+  --info-header: #e0f2fe;
+  --info-text: #075985;
+
+  --badge-low-bg: #dcfce7;
+  --badge-low-text: #166534;
+  --badge-medium-bg: #fef9c3;
+  --badge-medium-text: #854d0e;
+  --badge-high-bg: #fee2e2;
+  --badge-high-text: #991b1b;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --surface: #1e1f27;
+    --surface-hover: #25262f;
+
+    --danger-bg: #1f1315;
+    --danger-border: #5b2128;
+    --danger-header: #2d1517;
+    --danger-text: #fca5a5;
+
+    --warning-bg: #1c1509;
+    --warning-border: #5c3d10;
+    --warning-header: #271c0a;
+    --warning-text: #fcd34d;
+
+    --info-bg: #091520;
+    --info-border: #0c3a54;
+    --info-header: #0d1f2e;
+    --info-text: #7dd3fc;
+
+    --badge-low-bg: rgba(34, 197, 94, 0.15);
+    --badge-low-text: #86efac;
+    --badge-medium-bg: rgba(234, 179, 8, 0.15);
+    --badge-medium-text: #fde047;
+    --badge-high-bg: rgba(239, 68, 68, 0.15);
+    --badge-high-text: #fca5a5;
+  }
+}
+
+/* ── Layout ───────────────────────────────────────────────────────────────── */
+
+.app {
+  max-width: 1300px;
+  margin: 0 auto;
+  padding: 24px 20px 48px;
+}
+
+.app-header {
+  display: flex;
+  align-items: center;
+  gap: 16px;
   margin-bottom: 24px;
 
-  &:hover {
-    border-color: var(--accent-border);
-  }
-  &:focus-visible {
-    outline: 2px solid var(--accent);
-    outline-offset: 2px;
+  h1 {
+    margin: 0;
+    font-size: 1.6rem;
+    letter-spacing: -0.5px;
+    color: var(--text-h);
   }
 }
 
-.hero {
-  position: relative;
+.fetching-badge {
+  font-size: 0.75rem;
+  color: var(--text);
+  background: var(--surface);
+  border: 1px solid var(--border);
+  padding: 2px 10px;
+  border-radius: 12px;
+}
 
-  .base,
-  .framework,
-  .vite {
-    inset-inline: 0;
-    margin: 0 auto;
-  }
+/* ── Alert cards ──────────────────────────────────────────────────────────── */
 
-  .base {
-    width: 170px;
-    position: relative;
-    z-index: 0;
-  }
+.alerts-panel {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 14px;
+  margin-bottom: 28px;
 
-  .framework,
-  .vite {
-    position: absolute;
-  }
-
-  .framework {
-    z-index: 1;
-    top: 34px;
-    height: 28px;
-    transform: perspective(2000px) rotateZ(300deg) rotateX(44deg) rotateY(39deg)
-      scale(1.4);
-  }
-
-  .vite {
-    z-index: 0;
-    top: 107px;
-    height: 26px;
-    width: auto;
-    transform: perspective(2000px) rotateZ(300deg) rotateX(40deg) rotateY(39deg)
-      scale(0.8);
+  @media (max-width: 768px) {
+    grid-template-columns: 1fr;
   }
 }
 
-#center {
+.alert-card {
+  border-radius: 10px;
+  border: 1px solid;
+  overflow: hidden;
+}
+
+.alert-card--danger {
+  background: var(--danger-bg);
+  border-color: var(--danger-border);
+}
+.alert-card--warning {
+  background: var(--warning-bg);
+  border-color: var(--warning-border);
+}
+.alert-card--info {
+  background: var(--info-bg);
+  border-color: var(--info-border);
+}
+
+.alert-card__header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 10px 14px;
+  font-weight: 600;
+  font-size: 0.82rem;
+  letter-spacing: 0.02em;
+  text-transform: uppercase;
+
+  .alert-card--danger & {
+    background: var(--danger-header);
+    color: var(--danger-text);
+    border-bottom: 1px solid var(--danger-border);
+  }
+  .alert-card--warning & {
+    background: var(--warning-header);
+    color: var(--warning-text);
+    border-bottom: 1px solid var(--warning-border);
+  }
+  .alert-card--info & {
+    background: var(--info-header);
+    color: var(--info-text);
+    border-bottom: 1px solid var(--info-border);
+  }
+}
+
+.alert-card__count {
+  background: rgba(0 0 0 / 0.1);
+  border-radius: 10px;
+  padding: 1px 8px;
+  font-size: 0.8rem;
+  font-weight: 700;
+  text-transform: none;
+  letter-spacing: 0;
+}
+
+@media (prefers-color-scheme: dark) {
+  .alert-card__count {
+    background: rgba(255 255 255 / 0.1);
+  }
+}
+
+.alert-card__list {
+  list-style: none;
+  margin: 0;
+  padding: 10px 14px 12px;
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+
+  li {
+    font-size: 0.8rem;
+    font-family: var(--mono);
+    padding: 2px 8px;
+    border-radius: 4px;
+
+    .alert-card--danger & {
+      background: var(--danger-header);
+      color: var(--danger-text);
+    }
+    .alert-card--warning & {
+      background: var(--warning-header);
+      color: var(--warning-text);
+    }
+    .alert-card--info & {
+      background: var(--info-header);
+      color: var(--info-text);
+    }
+  }
+}
+
+.alert-card__empty {
+  margin: 0;
+  padding: 10px 14px 12px;
+  font-size: 0.85rem;
+  color: var(--text);
+
+  &--error {
+    color: var(--danger-text);
+  }
+}
+
+/* ── State messages ───────────────────────────────────────────────────────── */
+
+.state-message {
+  text-align: center;
+  padding: 48px;
+  color: var(--text);
+
+  &.error {
+    color: var(--danger-text);
+
+    button {
+      margin-top: 12px;
+      padding: 6px 16px;
+      border-radius: 6px;
+      border: 1px solid var(--danger-border);
+      background: var(--danger-bg);
+      color: var(--danger-text);
+      cursor: pointer;
+
+      &:hover {
+        background: var(--danger-header);
+      }
+    }
+  }
+}
+
+/* ── Table ────────────────────────────────────────────────────────────────── */
+
+.table-wrapper {
+  overflow-x: auto;
+  border: 1px solid var(--border);
+  border-radius: 10px;
+}
+
+table {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 0.875rem;
+
+  th {
+    background: var(--surface);
+    color: var(--text);
+    text-align: left;
+    padding: 10px 14px;
+    font-weight: 600;
+    font-size: 0.78rem;
+    letter-spacing: 0.05em;
+    text-transform: uppercase;
+    border-bottom: 1px solid var(--border);
+    white-space: nowrap;
+  }
+
+  td {
+    padding: 10px 14px;
+    color: var(--text-h);
+    border-bottom: 1px solid var(--border);
+    vertical-align: middle;
+  }
+
+  tbody tr:last-child td {
+    border-bottom: none;
+  }
+
+  tbody tr:hover td {
+    background: var(--surface);
+  }
+}
+
+.missing {
+  color: var(--border);
+}
+
+/* ── Risk badge ───────────────────────────────────────────────────────────── */
+
+.risk-badge {
+  display: inline-block;
+  min-width: 24px;
+  text-align: center;
+  font-weight: 700;
+  font-size: 0.78rem;
+  padding: 2px 8px;
+  border-radius: 12px;
+}
+
+.risk-badge--low {
+  background: var(--badge-low-bg);
+  color: var(--badge-low-text);
+}
+.risk-badge--medium {
+  background: var(--badge-medium-bg);
+  color: var(--badge-medium-text);
+}
+.risk-badge--high {
+  background: var(--badge-high-bg);
+  color: var(--badge-high-text);
+}
+
+.data-issue-flag {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  margin-left: 6px;
+  font-size: 0.7rem;
+  font-weight: 800;
+  color: var(--warning-text);
+  background: var(--warning-header);
+  border: 1px solid var(--warning-border);
+  border-radius: 50%;
+  width: 16px;
+  height: 16px;
+  cursor: default;
+  vertical-align: middle;
+}
+
+/* ── Pagination ───────────────────────────────────────────────────────────── */
+
+.pagination {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 12px;
+  margin-top: 20px;
+
+  span {
+    font-size: 0.875rem;
+    color: var(--text);
+  }
+
+  button {
+    padding: 6px 18px;
+    border-radius: 6px;
+    border: 1px solid var(--accent-border);
+    background: var(--accent-bg);
+    color: var(--accent);
+    cursor: pointer;
+    font-size: 0.875rem;
+    font-weight: 500;
+    transition: background 0.15s, border-color 0.15s;
+
+    &:hover:not(:disabled) {
+      background: var(--accent-bg);
+      border-color: var(--accent);
+      filter: brightness(1.1);
+    }
+
+    &:disabled {
+      opacity: 0.35;
+      cursor: not-allowed;
+    }
+  }
+}
+
+/* ── Submission panel ─────────────────────────────────────────────────────── */
+
+.submission-panel {
+  margin-top: 40px;
+  border: 1px solid var(--border);
+  border-radius: 10px;
+  overflow: hidden;
+}
+
+.submission-panel__header {
+  padding: 18px 20px 14px;
+  border-bottom: 1px solid var(--border);
+  background: var(--surface);
+
+  h2 {
+    margin: 0 0 4px;
+    font-size: 1.1rem;
+    color: var(--text-h);
+  }
+}
+
+.submission-panel__note {
+  font-size: 0.85rem;
+  color: var(--text);
+  margin: 0;
+}
+
+/* ── Payload preview ─────────────────────────────────────────────────── */
+
+.payload-preview {
   display: flex;
   flex-direction: column;
-  gap: 25px;
-  place-content: center;
-  place-items: center;
-  flex-grow: 1;
+}
 
-  @media (max-width: 1024px) {
-    padding: 32px 20px 24px;
-    gap: 18px;
+.payload-row {
+  display: grid;
+  grid-template-columns: 280px 1fr;
+  align-items: start;
+  gap: 12px;
+  padding: 12px 20px;
+  border-bottom: 1px solid var(--border);
+
+  &:last-child {
+    border-bottom: none;
+  }
+
+  @media (max-width: 640px) {
+    grid-template-columns: 1fr;
   }
 }
 
-#next-steps {
-  display: flex;
-  border-top: 1px solid var(--border);
-  text-align: left;
-
-  & > div {
-    flex: 1 1 0;
-    padding: 32px;
-    @media (max-width: 1024px) {
-      padding: 24px 20px;
-    }
-  }
-
-  .icon {
-    margin-bottom: 16px;
-    width: 22px;
-    height: 22px;
-  }
-
-  @media (max-width: 1024px) {
-    flex-direction: column;
-    text-align: center;
-  }
-}
-
-#docs {
-  border-right: 1px solid var(--border);
-
-  @media (max-width: 1024px) {
-    border-right: none;
-    border-bottom: 1px solid var(--border);
-  }
-}
-
-#next-steps ul {
-  list-style: none;
-  padding: 0;
+.payload-row--danger { background: var(--danger-bg); }
+.payload-row--warning { background: var(--warning-bg); }
+.payload-row--info { background: var(--info-bg); }
+
+.payload-row__label {
   display: flex;
+  align-items: center;
   gap: 8px;
-  margin: 32px 0 0;
+  padding-top: 2px;
 
-  .logo {
-    height: 18px;
-  }
+  code {
+    font-size: 0.8rem;
+    background: transparent;
+    padding: 0;
 
-  a {
-    color: var(--text-h);
-    font-size: 16px;
-    border-radius: 6px;
-    background: var(--social-bg);
-    display: flex;
-    padding: 6px 12px;
-    align-items: center;
-    gap: 8px;
-    text-decoration: none;
-    transition: box-shadow 0.3s;
-
-    &:hover {
-      box-shadow: var(--shadow);
-    }
-    .button-icon {
-      height: 18px;
-      width: 18px;
-    }
-  }
-
-  @media (max-width: 1024px) {
-    margin-top: 20px;
-    flex-wrap: wrap;
-    justify-content: center;
-
-    li {
-      flex: 1 1 calc(50% - 8px);
-    }
-
-    a {
-      width: 100%;
-      justify-content: center;
-      box-sizing: border-box;
-    }
+    .payload-row--danger & { color: var(--danger-text); }
+    .payload-row--warning & { color: var(--warning-text); }
+    .payload-row--info & { color: var(--info-text); }
   }
 }
 
-#spacer {
-  height: 88px;
+.payload-row__count {
+  font-size: 0.75rem;
+  font-weight: 700;
+  border-radius: 10px;
+  padding: 1px 7px;
+
+  .payload-row--danger & { background: var(--danger-header); color: var(--danger-text); }
+  .payload-row--warning & { background: var(--warning-header); color: var(--warning-text); }
+  .payload-row--info & { background: var(--info-header); color: var(--info-text); }
+}
+
+.payload-row__ids {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  min-height: 24px;
+}
+
+.payload-row__empty {
+  font-size: 0.8rem;
+  font-family: var(--mono);
+  color: var(--text);
+  opacity: 0.5;
+}
+
+.payload-id {
+  font-size: 0.8rem;
+  font-family: var(--mono);
+  padding: 2px 8px;
+  border-radius: 4px;
+
+  .payload-row--danger & { background: var(--danger-header); color: var(--danger-text); }
+  .payload-row--warning & { background: var(--warning-header); color: var(--warning-text); }
+  .payload-row--info & { background: var(--info-header); color: var(--info-text); }
+}
+
+/* ── Submit button & error ────────────────────────────────────────────── */
+
+.submission-panel__actions {
+  padding: 16px 20px;
   border-top: 1px solid var(--border);
-  @media (max-width: 1024px) {
-    height: 48px;
+  background: var(--surface);
+  display: flex;
+  align-items: center;
+  gap: 16px;
+}
+
+.submit-btn {
+  padding: 10px 28px;
+  border-radius: 7px;
+  border: none;
+  background: var(--accent);
+  color: #fff;
+  font-size: 0.95rem;
+  font-weight: 600;
+  cursor: pointer;
+  transition: opacity 0.15s, filter 0.15s;
+
+  &:hover:not(:disabled) {
+    filter: brightness(1.1);
+  }
+
+  &:disabled {
+    opacity: 0.45;
+    cursor: not-allowed;
   }
 }
 
-.ticks {
-  position: relative;
+.submit-error {
+  margin: 0;
+  font-size: 0.875rem;
+  color: var(--danger-text);
+}
+
+/* ── Submission result ────────────────────────────────────────────────── */
+
+.submission-result {
+  margin: 0;
+  border-top: 1px solid var(--border);
+}
+
+.submission-result__header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+  padding: 16px 20px;
+  flex-wrap: wrap;
+}
+
+.submission-result--pass .submission-result__header { background: var(--badge-low-bg); }
+.submission-result--fail .submission-result__header { background: var(--danger-bg); }
+
+.submission-result__score {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.submission-result__pct {
+  font-size: 2rem;
+  font-weight: 800;
+  color: var(--text-h);
+  line-height: 1;
+}
+
+.submission-result__status {
+  font-size: 0.85rem;
+  font-weight: 700;
+  padding: 3px 12px;
+  border-radius: 12px;
+}
+
+.status--pass {
+  background: var(--badge-low-bg);
+  color: var(--badge-low-text);
+}
+.status--fail {
+  background: var(--badge-high-bg);
+  color: var(--badge-high-text);
+}
+
+.submission-result__meta {
+  display: flex;
+  gap: 16px;
+  font-size: 0.82rem;
+  color: var(--text);
+  flex-wrap: wrap;
+}
+
+.personal-best {
+  color: var(--accent);
+  font-weight: 600;
+}
+
+.breakdown-table {
   width: 100%;
+  border-radius: 0;
+  border-top: 1px solid var(--border);
 
-  &::before,
-  &::after {
-    content: '';
-    position: absolute;
-    top: -4.5px;
-    border: 5px solid transparent;
-  }
+  th, td {
+    text-align: right;
+    padding: 9px 20px;
 
-  &::before {
-    left: 0;
-    border-left-color: var(--border);
-  }
-  &::after {
-    right: 0;
-    border-right-color: var(--border);
+    &:first-child {
+      text-align: left;
+    }
   }
 }
+
+.feedback-list {
+  margin: 0;
+  padding: 12px 20px;
+  list-style: none;
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  border-top: 1px solid var(--border);
+  font-size: 0.875rem;
+
+  li { color: var(--text-h); }
+
+  &--strengths { background: var(--badge-low-bg); }
+  &--issues { background: var(--warning-bg); }
+}
diff --git a/src/App.tsx b/src/App.tsx
index 46a5992..1cd1c57 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,121 +1,62 @@
-import { useState } from 'react'
-import reactLogo from './assets/react.svg'
-import viteLogo from './assets/vite.svg'
-import heroImg from './assets/hero.png'
-import './App.css'
+import { useState } from 'react';
+import { AlertsPanel, PatientTable, SubmissionPanel } from './components'
+import { useAllPatients, usePatientRiskAnalysis } from './hooks';
+import './App.css';
 
-function App() {
-  const [count, setCount] = useState(0)
+const PAGE_SIZE = 10;
+
+const App = () => {
+  const [page, setPage] = useState(1);
+  const {
+    data: allPatients,
+    isLoading,
+    isFetching,
+    isError,
+    error,
+    refetch,
+  } = useAllPatients();
+  const riskAnalysis = usePatientRiskAnalysis();
+  const totalPatients = allPatients?.length ?? 0;
+  const totalPages = Math.max(1, Math.ceil(totalPatients / PAGE_SIZE));
+  const pagePatients = allPatients?.slice(
+    (page - 1) * PAGE_SIZE, page * PAGE_SIZE
+  ) ?? [];
 
   return (
-    <>
-      <section id="center">
-        <div className="hero">
-          <img src={heroImg} className="base" width="170" height="179" alt="" />
-          <img src={reactLogo} className="framework" alt="React logo" />
-          <img src={viteLogo} className="vite" alt="Vite logo" />
-        </div>
-        <div>
-          <h1>Get started</h1>
-          <p>
-            Edit <code>src/App.tsx</code> and save to test <code>HMR</code>
-          </p>
-        </div>
-        <button
-          className="counter"
-          onClick={() => setCount((count) => count + 1)}
-        >
-          Count is {count}
-        </button>
-      </section>
-
-      <div className="ticks"></div>
-
-      <section id="next-steps">
-        <div id="docs">
-          <svg className="icon" role="presentation" aria-hidden="true">
-            <use href="/icons.svg#documentation-icon"></use>
-          </svg>
-          <h2>Documentation</h2>
-          <p>Your questions, answered</p>
-          <ul>
-            <li>
-              <a href="https://vite.dev/" target="_blank">
-                <img className="logo" src={viteLogo} alt="" />
-                Explore Vite
-              </a>
-            </li>
-            <li>
-              <a href="https://react.dev/" target="_blank">
-                <img className="button-icon" src={reactLogo} alt="" />
-                Learn more
-              </a>
-            </li>
-          </ul>
-        </div>
-        <div id="social">
-          <svg className="icon" role="presentation" aria-hidden="true">
-            <use href="/icons.svg#social-icon"></use>
-          </svg>
-          <h2>Connect with us</h2>
-          <p>Join the Vite community</p>
-          <ul>
-            <li>
-              <a href="https://github.com/vitejs/vite" target="_blank">
-                <svg
-                  className="button-icon"
-                  role="presentation"
-                  aria-hidden="true"
-                >
-                  <use href="/icons.svg#github-icon"></use>
-                </svg>
-                GitHub
-              </a>
-            </li>
-            <li>
-              <a href="https://chat.vite.dev/" target="_blank">
-                <svg
-                  className="button-icon"
-                  role="presentation"
-                  aria-hidden="true"
-                >
-                  <use href="/icons.svg#discord-icon"></use>
-                </svg>
-                Discord
-              </a>
-            </li>
-            <li>
-              <a href="https://x.com/vite_js" target="_blank">
-                <svg
-                  className="button-icon"
-                  role="presentation"
-                  aria-hidden="true"
-                >
-                  <use href="/icons.svg#x-icon"></use>
-                </svg>
-                X.com
-              </a>
-            </li>
-            <li>
-              <a href="https://bsky.app/profile/vite.dev" target="_blank">
-                <svg
-                  className="button-icon"
-                  role="presentation"
-                  aria-hidden="true"
-                >
-                  <use href="/icons.svg#bluesky-icon"></use>
-                </svg>
-                Bluesky
-              </a>
-            </li>
-          </ul>
-        </div>
-      </section>
-
-      <div className="ticks"></div>
-      <section id="spacer"></section>
-    </>
-  )
+    <div className='app'>
+      <header className='app-header'>
+        <h1>Patient Records</h1>
+        {isFetching && !isLoading && <span className='fetching-badge'>Updating...</span>}
+      </header>
+      <AlertsPanel
+        alerts={riskAnalysis.submissionPayload}
+        loading={riskAnalysis.isLoading}
+        error={riskAnalysis.error}
+      />
+      <main>
+        {isLoading && <div className='state-message'>Loading patients...</div>}
+        {isError && (
+          <div className='state-message error'>
+            <p>{error.message}</p>
+            <button onClick={() => refetch()}>Retry</button>
+          </div>
+        )}
+        {allPatients && (
+          <PatientTable
+            patients={pagePatients}
+            page={page}
+            totalPages={totalPages}
+            totalPatients={totalPatients}
+            onPageChange={setPage}
+          />
+        )}
+      </main>
+      <SubmissionPanel
+        payload={riskAnalysis.submissionPayload}
+        loading={riskAnalysis.isLoading}
+      />
+    </div>
+  );
 }
 
 export default App
diff --git a/src/api/patients.ts b/src/api/patients.ts
new file mode 100644
index 0000000..b29d73d
--- /dev/null
+++ b/src/api/patients.ts
@@ -0,0 +1,116 @@
+const BASE_URL = import.meta.env.VITE_BASE_URL as string;
+const API_KEY = import.meta.env.VITE_API_KEY as string;
+
+export interface Patient {
+  patient_id: string,
+  name: string,
+  age: number | null,
+  gender: string,
+  blood_pressure: string
+  temperature: number | null,
+  visit_date: string
+  diagnosis: string
+  medications: string
+};
+
+export interface Pagination {
+  page: number
+  limit: number
+  total: number
+  totalPages: number
+  hasNext: boolean
+  hasPrevious: boolean
+};
+
+export interface PatientsResponse {
+  data: Patient[]
+  pagination: Pagination
+};
+
+export class ApiError extends Error {
+  readonly status: number
+  constructor(status: number, message: string) {
+    super(message)
+    this.name = 'ApiError'
+    this.status = status
+  };
+};
+
+const normalizePatient = (raw: Record<string, unknown>): Patient => {
+  return {
+    patient_id: String(raw.patient_id ?? raw.id ?? ''),
+    name: String(raw.name ?? raw.patient_name ?? 'Unknown'),
+    age: raw.age != null ? Number(raw.age): null,
+    gender: String(raw.gender ?? raw.sex ?? ''),
+    blood_pressure: String(raw.blood_pressure ?? raw.bp ?? ''),
+    temperature: raw.temperature != null ? Number(raw.temperature) : null,
+    visit_date: String(raw.visit_date ?? raw.date ?? ''),
+    diagnosis: String(raw.diagnosis ?? raw.condition ?? ''),
+    medications: String(raw.medications ?? raw.meds ?? ''),
+  };
+};
+
+const normalizePagination = (
+  raw: Record<string, unknown>,
+  page: number,
+  limit: number,
+): Pagination => {
+  return {
+    page: Number(raw.page ?? page),
+    limit: Number(raw.limit ?? raw.per_page ?? limit),
+    total: Number(raw.total ?? raw.totalCount ?? raw.total_count ?? 0),
+    totalPages: Number(raw.totalPages ?? raw.total_pages ?? raw.pages ?? 1),
+    hasNext: Boolean(raw.hasNext ?? raw.has_next ?? false),
+    hasPrevious: Boolean(raw.hasPrevious ?? raw.has_previous ?? false),
+  };
+};
+
+const delay = (ms: number): Promise<void> => new Promise((resolve) => setTimeout(resolve, ms));
+
+const fetchPageWithRetry = async (
+  page: number,
+  limit: number,
+  attempt= 0,
+): Promise<PatientsResponse> => {
+  try {
+    return await fetchPatients(page, limit);
+  } catch (error) {
+    if (error instanceof ApiError && error.status === 429 && attempt < 5) {
+      await delay(Math.min(1500 * 2 ** attempt, 20_000));
+      return fetchPageWithRetry(page, limit, attempt + 1);
+    }
+    throw error;
+  }
+};
+
+export const fetchAllPatients = async (): Promise<Patient[]> => {
+  const all: Patient[] = [];
+  let page = 1;
+  while (true) {
+    const result = await fetchPageWithRetry(page, 10);
+    all.push(...result.data);
+    if (!result.pagination.hasNext) break
+    page++;
+    await delay(500);
+  }
+  return all;
+};
+
+export const fetchPatients = async (
+  page = 1,
+  limit = 10,
+): Promise<PatientsResponse> => {
+  const url = `${BASE_URL}/api/patients?page=${page}&limit=${limit}`;
+  const res = await fetch(url, {
+    headers: { 'x-api-key': API_KEY }
+  });
+  if (!res.ok)
+    throw new ApiError(res.status, `API error ${res.status}: ${res.statusText}`)
+  const json = await res.json();
+  const rawData = json.data ?? json.patients ?? json.results ?? [];
+  const rawPagination = json.pagination ?? json.meta ?? json.paging ?? {};
+  return {
+    data: Array.isArray(rawData) ? rawData.map(normalizePatient) : [],
+    pagination: normalizePagination(rawPagination, page, limit),
+  };
+};
diff --git a/src/api/submit.ts b/src/api/submit.ts
new file mode 100644
index 0000000..8dd0e2f
--- /dev/null
+++ b/src/api/submit.ts
@@ -0,0 +1,52 @@
+import { ApiError } from './patients'
+import type { SubmissionPayload } from '../lib/scoring'
+
+const BASE_URL = import.meta.env.VITE_BASE_URL as string
+const API_KEY = import.meta.env.VITE_API_KEY as string
+
+interface BreakdownCategory {
+  score: number;
+  max: number;
+  correct: number;
+  submitted: number;
+  matches: number;
+};
+
+export interface SubmissionResponse {
+  success: boolean;
+  message: string;
+  results: {
+    score: number;
+    percentage: number;
+    status: string;
+    breakdown: {
+      high_risk: BreakdownCategory
+      fever: BreakdownCategory
+      data_quality: BreakdownCategory
+    };
+    feedback: {
+      strengths: string[];
+      issues: string[];
+    };
+    attempt_number: number;
+    remaining_attempts: number;
+    is_personal_best: boolean;
+    can_resubmit: boolean;
+  };
+};
+
+export const submitAssessment = async (
+  payload: SubmissionPayload
+): Promise<SubmissionResponse> => {
+  const res = await fetch(`${BASE_URL}/api/submit-assessment`, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+      'x-api-key': API_KEY,
+    },
+    body: JSON.stringify(payload),
+  });
+  if (!res.ok)
+    throw new ApiError(res.status, `Submission failed: ${res.status} ${res.statusText}`)
+  return res.json() as Promise<SubmissionResponse>
+};
diff --git a/src/assets/hero.png b/src/assets/hero.png
deleted file mode 100644
index cc51a3d..0000000
Binary files a/src/assets/hero.png and /dev/null differ
diff --git a/src/assets/react.svg b/src/assets/react.svg
deleted file mode 100644
index 6c87de9..0000000
--- a/src/assets/react.svg
+++ /dev/null
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diff --git a/src/assets/vite.svg b/src/assets/vite.svg
deleted file mode 100644
index 5101b67..0000000
--- a/src/assets/vite.svg
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/src/components/AlertsPanel.tsx b/src/components/AlertsPanel.tsx
new file mode 100644
index 0000000..3cdc766
--- /dev/null
+++ b/src/components/AlertsPanel.tsx
@@ -0,0 +1,73 @@
+import type { SubmissionPayload } from '../lib/scoring';
+
+const AlertCard = ({
+  title,
+  ids,
+  variant,
+  loading,
+  error,
+}: {
+  title: string;
+  ids: string[];
+  variant: 'danger' | 'warning' | 'info';
+  loading: boolean;
+  error?: Error | null;
+}) => {
+  return (
+    <div className={`alert-card alert-card--${variant}`}>
+      <div className='alert-card__header'>
+        <span className='alert-card__title'>{title}</span>
+        {!loading && !error && <span className='alert-card__count'>{ids.length}</span>}
+      </div>
+      { loading ? (
+        <p className='alert-card__empty'>Loading...</p>
+      ): error ? (
+        <p className="alert-card__empty alert-card__empty--error">{error.message}</p>
+      ): ids.length === 0 ? (
+        <p className='alert-card__empty'>None</p>
+      ): (
+        <ul className='alert-cards__list'>
+          {ids.map((id) => (
+            <li key={id}>{id}</li>
+          ))}
+        </ul>
+      )}
+    </div>
+  );
+};
+
+export const AlertsPanel = ({
+  alerts,
+  loading,
+  error,
+}: {
+  alerts: SubmissionPayload;
+  loading: boolean;
+  error?: Error | null;
+}) => {
+  return (
+    <div className='alerts-panel'>
+      <AlertCard
+        title='High Risk Patients (score >= 4)'
+        ids={alerts.high_risk_patients}
+        variant='danger'
+        loading={loading}
+        error={error}
+      />
+      <AlertCard
+        title='Fever Patients (temp >= 99.6 F)'
+        ids={alerts.fever_patients}
+        variant='warning'
+        loading={loading}
+        error={error}
+      />
+      <AlertCard
+        title='Data Quality Issue Patients'
+        ids={alerts.data_quality_issues}
+        variant='info'
+        loading={loading}
+        error={error}
+      />
+    </div>
+  );
+};
diff --git a/src/components/PatientTable.tsx b/src/components/PatientTable.tsx
new file mode 100644
index 0000000..a4069ca
--- /dev/null
+++ b/src/components/PatientTable.tsx
@@ -0,0 +1,85 @@
+import type { Patient } from '../api/patients'
+import { scorePatient } from '../lib/scoring'
+
+const RiskBadge = ({ score }: { score: number}) => {
+  const level = score >= 4 ? 'high' : score >= 2 ? 'medium' : 'low';
+  return <span className={`risk-badge risk-badge--${level}`}>{score}</span>
+};
+
+export const PatientTable = ({
+  patients,
+  page,
+  totalPages,
+  totalPatients,
+  onPageChange,
+}: {
+  patients: Patient[];
+  page: number;
+  totalPages: number;
+  totalPatients: number;
+  onPageChange: (page: number) => void;
+}) => {
+  return (
+    <>
+      <div className='table-wrapper'>
+        <table>
+          <thead>
+            <tr>
+              <th>ID</th>
+              <th>Name</th>
+              <th>Age</th>
+              <th>Gender</th>
+              <th>Blood Pressure</th>
+              <th>Temp</th>
+              <th>Visited</th>
+              <th>Diagnosis</th>
+              <th>Medications</th>
+              <th>Risk</th>
+            </tr>
+          </thead>
+          <tbody>
+            {patients.map((patient) => {
+              const score = scorePatient(patient);
+              return (
+                <tr key={patient.patient_id}>
+                  <td>{patient.patient_id}</td>
+                  <td>{patient.name}</td>
+                  <td>{patient.age ?? <span className='missing'>-</span>}</td>
+                  <td>{patient.gender}</td>
+                  <td>{patient.blood_pressure}</td>
+                  <td>{patient.temperature}</td>
+                  <td>{patient.visit_date}</td>
+                  <td>{patient.diagnosis}</td>
+                  <td>{patient.medications}</td>
+                  <td>
+                    <RiskBadge score={score.totalScore} />
+                    {score.hasDataIssue && (
+                      <span className='data-issue-flag' title='Missing or invalid data'>!</span>
+                    )}
+                  </td>
+                </tr>
+              );
+            })}
+          </tbody>
+        </table>
+      </div>
+      <div className='pagination'>
+        <button
+          disabled={page <= 1}
+          onClick={() => onPageChange(page - 1)}
+        >
+          Previous
+        </button>
+        <span>
+          Page {page} of {totalPages}&nbsp;({totalPatients} total)
+        </span>
+        <button
+          disabled={page >= totalPages}
+          onClick={() => onPageChange(page + 1)}
+        >
+          Next
+        </button>
+      </div>
+    </>
+  );
+};
diff --git a/src/components/SubmissionPanel.tsx b/src/components/SubmissionPanel.tsx
new file mode 100644
index 0000000..146fb43
--- /dev/null
+++ b/src/components/SubmissionPanel.tsx
@@ -0,0 +1,130 @@
+import { useSubmitAssessment } from '../hooks'
+import type { SubmissionPayload } from '../lib/scoring'
+import type { SubmissionResponse } from '../api/submit'
+
+const PayloadPreview = ({ payload }: { payload: SubmissionPayload }) => {
+  const rows: { label: string; key: keyof SubmissionPayload; variant: string }[] = [
+    { label: 'High Risk Patients', key: 'high_risk_patients', variant: 'danger'},
+    { label: 'Fever Patients', key: 'fever_patients', variant: 'warning'},
+    { label: 'Data Quality Issue Patients', key: 'data_quality_issues', variant: 'info'},
+  ];
+  return (
+    <div className='payload-preview'>
+      {rows.map(({ label, key, variant }) => (
+        <div key={key} className={`payload-row payload-row--${variant}`}>
+          <div className='payload-row__label'>
+            <code>{label}</code>
+            <span className='payload-row__count'>{payload[key].length}</span>
+          </div>
+          <div className='payload-row__ids'>
+            {payload[key].length === 0 ? (
+              <span className='payload-row__empty'>[]</span>
+            ): (
+              payload[key].map((id) => <span key={id} className='payload-id'>{id}</span>)
+            )}
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+};
+
+const SubmissionResult = ({ result }: { result: SubmissionResponse }) => {
+  const { results } = result;
+  const isPassing = results.status === 'PASS';
+  return (
+    <div className={`submission-result ${isPassing ? 'submission-result--pass' : 'submission-result--fail'}`}>
+      <div className='submission-result__header'>
+        <div className='submission-result__score'>
+          <span className='submission-result__pct'>{results.percentage}%</span>
+          <span className={`submission-result__status ${isPassing ? 'status--pass' : 'status--fail'}`}>
+            {results.status}
+          </span>
+        </div>
+        <div className='submission-result__meta'>
+          <span>Attempt {results.attempt_number}</span>
+          <span>
+            {results.remaining_attempts} attempt{results.remaining_attempts === 1 ? 's': ''} remaining
+          </span>
+        </div>
+      </div>
+      <table className='breakdown-table'>
+        <thead>
+          <tr>
+            <th>Category</th>
+            <th>Score</th>
+            <th>Correct</th>
+            <th>Submitted</th>
+            <th>Matches</th>
+          </tr>
+        </thead>
+        <tbody>
+          {(
+            [
+              ['High Risk', results.breakdown.high_risk],
+              ['Fever', results.breakdown.fever],
+              ['Data Quality', results.breakdown.data_quality],
+            ] as const
+          ).map(([label, cat]) => (
+            <tr key={label}>
+              <td>{label}</td>
+              <td>{cat.score} / {cat.max}</td>
+              <td>{cat.correct}</td>
+              <td>{cat.submitted}</td>
+              <td>{cat.matches}</td>
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  );
+};
+
+export const SubmissionPanel = ({
+  payload,
+  loading: analysisLoading,
+}: {
+  payload: SubmissionPayload;
+  loading: boolean;
+}) => {
+  const {
+    mutate,
+    isPending,
+    isSuccess,
+    isError,
+    error,
+    data,
+  } = useSubmitAssessment();
+  const totalItems =
+    payload.high_risk_patients.length +
+    payload.fever_patients.length +
+    payload.data_quality_issues.length
+  return (
+    <section className='submission-panel'>
+      <div className='submission-panel__header'>
+        <h2>Submit Assessment</h2>
+        <p className='submission-panel__note'>
+          Review payload before submitting.
+        </p>
+      </div>
+      {analysisLoading ? (
+        <p className='state-message'>Loading patient data...</p>
+      ): (
+        <PayloadPreview payload={payload} />
+      )}
+      <div className='submission-panel__actions'>
+        <button
+          className='submit-btn'
+          disabled={isPending || analysisLoading || totalItems === 0}
+          onClick={() => mutate(payload)}
+        >
+          {isPending ? 'Submitting...' : 'Submit Assessment'}
+        </button>
+        {isError && (
+          <p className='submit-error'>{(error as Error).message}</p>
+        )}
+      </div>
+      {isSuccess && data && <SubmissionResult result={data} />}
+    </section>
+  );
+};
diff --git a/src/components/index.tsx b/src/components/index.tsx
new file mode 100644
index 0000000..bdb614c
--- /dev/null
+++ b/src/components/index.tsx
@@ -0,0 +1,3 @@
+export { AlertsPanel } from './AlertsPanel';
+export { PatientTable } from './PatientTable';
+export { SubmissionPanel } from './SubmissionPanel';
diff --git a/src/hooks/index.ts b/src/hooks/index.ts
new file mode 100644
index 0000000..325576e
--- /dev/null
+++ b/src/hooks/index.ts
@@ -0,0 +1,4 @@
+export { useAllPatients } from './useAllPatients';
+export { usePatientRiskAnalysis } from './usePatientRiskAnalysis';
+export { usePatients } from './usePatients';
+export { useSubmitAssessment } from './useSubmitAssessment';
diff --git a/src/hooks/useAllPatients.ts b/src/hooks/useAllPatients.ts
new file mode 100644
index 0000000..109c26b
--- /dev/null
+++ b/src/hooks/useAllPatients.ts
@@ -0,0 +1,11 @@
+import { useQuery } from '@tanstack/react-query'
+import { fetchAllPatients } from '../api/patients'
+import { apiRetryConfig } from '../lib/queryConfig'
+
+export const useAllPatients = () => useQuery({
+  queryKey: ['patients', 'all'],
+  queryFn: fetchAllPatients,
+  staleTime: 5 * 60_000,
+  gcTime: 10 * 60_000,
+  ...apiRetryConfig,
+});
diff --git a/src/hooks/usePatientRiskAnalysis.ts b/src/hooks/usePatientRiskAnalysis.ts
new file mode 100644
index 0000000..42c615c
--- /dev/null
+++ b/src/hooks/usePatientRiskAnalysis.ts
@@ -0,0 +1,15 @@
+import { useAllPatients } from './useAllPatients'
+import { scorePatient, computeSubmissionPayload } from '../lib/scoring'
+
+export const usePatientRiskAnalysis = () => {
+  const { data, isLoading, isError, error } = useAllPatients();
+  const patients = data ?? [];
+  const submissionPayload = computeSubmissionPayload(patients);
+  return {
+    isLoading,
+    isError,
+    error,
+    scores: patients.map(scorePatient),
+    submissionPayload,
+  };
+};
diff --git a/src/hooks/usePatients.ts b/src/hooks/usePatients.ts
new file mode 100644
index 0000000..41824c2
--- /dev/null
+++ b/src/hooks/usePatients.ts
@@ -0,0 +1,11 @@
+import { useQuery, keepPreviousData } from '@tanstack/react-query';
+import { fetchPatients } from '../api/patients';
+import { apiRetryConfig } from '../lib/queryConfig';
+
+export const usePatients = (page = 1, limit = 10) => useQuery({
+  queryKey: ['patients', page, limit],
+  queryFn: () => fetchPatients(page, limit),
+  placeholderData: keepPreviousData,
+  staleTime: 30_000,
+  ...apiRetryConfig,
+});
diff --git a/src/hooks/useSubmitAssessment.ts b/src/hooks/useSubmitAssessment.ts
new file mode 100644
index 0000000..48fe36c
--- /dev/null
+++ b/src/hooks/useSubmitAssessment.ts
@@ -0,0 +1,4 @@
+import { useMutation } from '@tanstack/react-query';
+import { submitAssessment } from '../api/submit';
+
+export const useSubmitAssessment = () => useMutation({ mutationFn: submitAssessment });
diff --git a/src/index.css b/src/index.css
index 5fb3313..4bbeffa 100644
--- a/src/index.css
+++ b/src/index.css
@@ -51,14 +51,8 @@
 }
 
 #root {
-  width: 1126px;
-  max-width: 100%;
-  margin: 0 auto;
-  text-align: center;
-  border-inline: 1px solid var(--border);
+  width: 100%;
   min-height: 100svh;
-  display: flex;
-  flex-direction: column;
   box-sizing: border-box;
 }
 
diff --git a/src/lib/queryConfig.ts b/src/lib/queryConfig.ts
new file mode 100644
index 0000000..9cfccf6
--- /dev/null
+++ b/src/lib/queryConfig.ts
@@ -0,0 +1,15 @@
+import { ApiError } from '../api/patients'
+
+export const apiRetryConfig = {
+  retry: (failureCount: number, error: Error) => {
+    if (error instanceof ApiError && error.status === 429) return failureCount < 5
+    if (error instanceof ApiError && error.status >= 400 && error.status < 500) return false
+    return failureCount < 3
+  },
+  retryDelay: (attemptIndex: number, error: Error) => {
+    if (error instanceof ApiError && error.status === 429) {
+      return Math.min(2000 * 2 ** attemptIndex, 30_000)
+    }
+    return Math.min(1000 * 2 ** attemptIndex, 10_000)
+  },
+};
diff --git a/src/lib/scoring.ts b/src/lib/scoring.ts
new file mode 100644
index 0000000..1f0a09a
--- /dev/null
+++ b/src/lib/scoring.ts
@@ -0,0 +1,94 @@
+import type { Patient } from '../api/patients';
+
+export interface PatientRiskScore {
+  patient_id: string;
+  bpScore: number;
+  tempScore: number;
+  ageScore: number;
+  totalScore: number;
+  bpValid: boolean;
+  tempValid: boolean;
+  ageValid: boolean;
+  hasDataIssue: boolean;
+};
+
+export interface SubmissionPayload {
+  high_risk_patients: string[];
+  fever_patients: string[];
+  data_quality_issues: string[];
+};
+
+const scoreSystolic = (value: number): number => {
+  if (value < 120) return 0;
+  if (value < 130) return 1;
+  if (value < 140) return 2;
+  return 3;
+};
+
+const scoreDiastolic = (value: number): number => {
+  if (value < 80) return 0;
+  if (value < 90) return 2;
+  return 3;
+};
+
+export const scoreBP = (bp: string | null | undefined): { score: number; valid: boolean } => {
+  if (!bp) return { score: 0, valid: false };
+  const parts = bp.split('/');
+  if (parts.length !== 2) return { score: 0, valid: false };
+  const [sysStr, diaStr] = parts;
+  if (!sysStr.trim() || !diaStr.trim()) return { score: 0, valid: false };
+  const sys = Number(sysStr.trim()), dia = Number(diaStr.trim());
+  if (!Number.isFinite(sys) || !Number.isFinite(dia)) return { score: 0, valid: false };
+  return { score: Math.max(scoreSystolic(sys), scoreDiastolic(dia)), valid: true };
+};
+
+export const scoreTemp = (temp: number | null | undefined): { score: number; valid: boolean } => {
+  if (temp == null || !Number.isFinite(temp)) return { score: 0, valid: false };
+  if (temp <= 99.5) return { score: 0, valid: true };
+  if (temp <= 100.9) return { score: 1, valid: true };
+  return { score: 2, valid: true };
+};
+
+export const scoreAge = (age: number | null | undefined): { score: number; valid: boolean } => {
+  if (age == null || !Number.isFinite(age)) return { score: 0, valid: false };
+  if (age < 40) return { score: 0, valid: true };
+  if (age <= 65) return { score: 1, valid: true };
+  return { score: 2, valid: true };
+};
+
+export const scorePatient = (patient: Patient): PatientRiskScore => {
+  const patient_id = patient.patient_id;
+  const { score: bpScore, valid: bpValid } = scoreBP(patient.blood_pressure);
+  const { score: tempScore, valid: tempValid } = scoreTemp(patient.temperature);
+  const { score: ageScore, valid: ageValid } = scoreAge(patient.age);
+  const totalScore = bpScore + tempScore + ageScore;
+  const hasDataIssue = !bpValid || !tempValid || !ageValid;
+  return {
+    patient_id,
+    bpScore,
+    tempScore,
+    ageScore,
+    totalScore,
+    bpValid,
+    tempValid,
+    ageValid,
+    hasDataIssue
+  };
+};
+
+export const computeSubmissionPayload = (patients: Patient[]): SubmissionPayload => {
+  const high_risk_patients: string[] = [];
+  const fever_patients: string[] = [];
+  const data_quality_issues: string[] = [];
+
+  for (const patient of patients) {
+    const score = scorePatient(patient);
+    if (score.totalScore >= 4)
+      high_risk_patients.push(patient.patient_id)
+    if (score.tempValid && patient.temperature != null && patient.temperature >= 99.6)
+      fever_patients.push(patient.patient_id)
+    if (score.hasDataIssue)
+      data_quality_issues.push(patient.patient_id);
+  }
+  return { high_risk_patients, fever_patients, data_quality_issues };
+};
diff --git a/src/main.tsx b/src/main.tsx
index bef5202..849fd6a 100644
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -1,10 +1,15 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import './index.css'
 import App from './App.tsx'
 
+const queryClient = new QueryClient();
+
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
-    <App />
+    <QueryClientProvider client={queryClient}>
+      <App />
+    </QueryClientProvider>
   </StrictMode>,
 )