diff --git a/frontend/src/components/AppLayout.tsx b/frontend/src/components/AppLayout.tsx
index 832515f..5aea6f2 100644
--- a/frontend/src/components/AppLayout.tsx
+++ b/frontend/src/components/AppLayout.tsx
@@ -91,36 +91,24 @@ const AppLayout = () => {
   };
 
   return (
-    <div
-      style={{
-        minHeight: "100vh",
-        background: "#f6f7fb",
-        fontFamily: styles.page.fontFamily,
-        color: "#111827",
-      }}
-    >
-      <div style={{ ...styles.container, padding: "16px 24px 0" }}>
+    <div style={styles.appShell}>
+      <div style={{ ...styles.container, ...styles.appHeaderWrap }}>
         <div style={{ ...styles.card, ...styles.headerBar }}>
-          <div style={{ display: "flex", alignItems: "center", gap: 10, flexWrap: "wrap" }}>
-            <span style={{ margin: 0, color: "#111827", fontSize: 18, fontWeight: 700 }}>
+          <div style={styles.appHeaderBrandRow}>
+            <span style={styles.appTitle}>
               Ethnograph View
             </span>
             <span
               style={{
-                padding: "4px 10px",
-                borderRadius: 999,
-                fontSize: 12,
-                fontWeight: 700,
-                fontFamily: styles.page.fontFamily,
-                background: isSignedIn ? "#dcfce7" : "#fee2e2",
-                color: isSignedIn ? "#166534" : "#991b1b",
+                ...styles.authStatusBadge,
+                ...(isSignedIn ? styles.authStatusSignedIn : styles.authStatusSignedOut),
               }}
             >
               {isSignedIn ? `Signed in: ${getUserLabel(currentUser)}` : "Not signed in"}
             </span>
           </div>
 
-          <div style={{ ...styles.controls, flexWrap: "wrap" }}>
+          <div style={styles.controlsWrapped}>
             <button
               type="button"
               style={location.pathname === "/upload" ? styles.buttonPrimary : styles.buttonSecondary}
diff --git a/frontend/src/components/Card.tsx b/frontend/src/components/Card.tsx
index cdefe2b..3f19ecc 100644
--- a/frontend/src/components/Card.tsx
+++ b/frontend/src/components/Card.tsx
@@ -1,4 +1,7 @@
 import type { CSSProperties } from "react";
+import StatsStyling from "../styles/stats_styling";
+
+const styles = StatsStyling;
 
 const Card = (props: {
   label: string;
@@ -8,45 +11,17 @@ const Card = (props: {
   style?: CSSProperties
 }) => {
   return (
-    <div style={{
-        background: "rgba(255,255,255,0.85)",
-        border: "1px solid rgba(15,23,42,0.08)",
-        borderRadius: 16,
-        padding: 14,
-        boxShadow: "0 12px 30px rgba(15,23,42,0.06)",
-        minHeight: 88,
-        ...props.style
-    }}>
-      <div style={ {
-        display: "flex",
-        justifyContent: "space-between",
-        alignItems: "center",
-        gap: 10,
-    }}>
-        <div style={{   
-            fontSize: 12,
-            fontWeight: 700,
-            color: "rgba(15, 23, 42, 0.65)",
-            letterSpacing: "0.02em",
-            textTransform: "uppercase"
-            }}>
+    <div style={{ ...styles.cardBase, ...props.style }}>
+      <div style={styles.cardTopRow}>
+        <div style={styles.cardLabel}>
                 {props.label}
         </div>
         {props.rightSlot ? <div>{props.rightSlot}</div> : null}
       </div>
-      <div style={{
-            fontSize: 22,
-            fontWeight: 850,
-            marginTop: 6,
-            letterSpacing: "-0.02em",
-        }}>{props.value}</div>
-      {props.sublabel ? <div style={{
-            marginTop: 6,
-            fontSize: 12,
-            color: "rgba(15, 23, 42, 0.55)",
-        }}>{props.sublabel}</div> : null}
+      <div style={styles.cardValue}>{props.value}</div>
+      {props.sublabel ? <div style={styles.cardSubLabel}>{props.sublabel}</div> : null}
     </div>
   );
 }
 
-export default Card;
\ No newline at end of file
+export default Card;
diff --git a/frontend/src/components/EmotionalStats.tsx b/frontend/src/components/EmotionalStats.tsx
index 4da8259..ecc588f 100644
--- a/frontend/src/components/EmotionalStats.tsx
+++ b/frontend/src/components/EmotionalStats.tsx
@@ -66,11 +66,11 @@ const EmotionalStats = ({contentData}: EmotionalStatsProps) => {
       <div style={{ ...styles.container, ...styles.card, marginTop: 16 }}>
         <h2 style={styles.sectionTitle}>Average Emotion by Topic</h2>
         <p style={styles.sectionSubtitle}>Read confidence together with sample size. Topics with fewer than {lowSampleThreshold} events are usually noisy and less reliable.</p>
-        <div style={{ display: "flex", flexWrap: "wrap", gap: 10, fontSize: 13, color: "#4b5563", marginTop: 6 }}>
-          <span><strong style={{ color: "#111827" }}>Topics:</strong> {strongestPerTopic.length}</span>
-          <span><strong style={{ color: "#111827" }}>Median Sample:</strong> {medianSampleSize} events</span>
-          <span><strong style={{ color: "#111827" }}>Low Sample (&lt;{lowSampleThreshold}):</strong> {lowSampleTopics}</span>
-          <span><strong style={{ color: "#111827" }}>Stable Sample ({stableSampleThreshold}+):</strong> {stableSampleTopics}</span>
+        <div style={styles.emotionalSummaryRow}>
+          <span><strong style={{ color: "#24292f" }}>Topics:</strong> {strongestPerTopic.length}</span>
+          <span><strong style={{ color: "#24292f" }}>Median Sample:</strong> {medianSampleSize} events</span>
+          <span><strong style={{ color: "#24292f" }}>Low Sample (&lt;{lowSampleThreshold}):</strong> {lowSampleTopics}</span>
+          <span><strong style={{ color: "#24292f" }}>Stable Sample ({stableSampleThreshold}+):</strong> {stableSampleTopics}</span>
         </div>
         <p style={{ ...styles.sectionSubtitle, marginTop: 10, marginBottom: 0 }}>
           Confidence reflects how strongly one emotion leads within a topic, not model accuracy. Use larger samples for stronger conclusions.
@@ -81,19 +81,19 @@ const EmotionalStats = ({contentData}: EmotionalStatsProps) => {
         {strongestPerTopic.map((topic) => (
           <div key={topic.topic} style={{ ...styles.card, gridColumn: "span 4" }}>
             <h3 style={{ ...styles.sectionTitle, marginBottom: 6 }}>{topic.topic}</h3>
-            <div style={{ fontSize: 12, fontWeight: 700, color: "#6b7280", letterSpacing: "0.02em", textTransform: "uppercase" }}>
+            <div style={styles.emotionalTopicLabel}>
               Top Emotion
             </div>
-            <div style={{ fontSize: 24, fontWeight: 800, marginTop: 4, lineHeight: 1.2 }}>
+            <div style={styles.emotionalTopicValue}>
               {formatEmotion(topic.emotion)}
             </div>
-            <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center", marginTop: 10, fontSize: 13, color: "#6b7280" }}>
+            <div style={styles.emotionalMetricRow}>
               <span>Confidence</span>
-              <span style={{ fontWeight: 700, color: "#111827" }}>{topic.value.toFixed(3)}</span>
+              <span style={styles.emotionalMetricValue}>{topic.value.toFixed(3)}</span>
             </div>
-            <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center", marginTop: 4, fontSize: 13, color: "#6b7280" }}>
+            <div style={styles.emotionalMetricRowCompact}>
               <span>Sample Size</span>
-              <span style={{ fontWeight: 700, color: "#111827" }}>{topic.count} events</span>
+              <span style={styles.emotionalMetricValue}>{topic.count} events</span>
             </div>
           </div>
         ))}
diff --git a/frontend/src/components/UserModal.tsx b/frontend/src/components/UserModal.tsx
index b62eb9e..54ee5fc 100644
--- a/frontend/src/components/UserModal.tsx
+++ b/frontend/src/components/UserModal.tsx
@@ -13,26 +13,11 @@ type Props = {
 
 export default function UserModal({ open, onClose, userData, username }: Props) {
   return (
-    <Dialog open={open} onClose={onClose} style={{ position: "relative", zIndex: 50 }}>
-      <div
-        style={{
-          position: "fixed",
-          inset: 0,
-          background: "rgba(0,0,0,0.45)",
-        }}
-      />
+    <Dialog open={open} onClose={onClose} style={styles.modalRoot}>
+      <div style={styles.modalBackdrop} />
 
-      <div
-        style={{
-          position: "fixed",
-          inset: 0,
-          display: "flex",
-          alignItems: "center",
-          justifyContent: "center",
-          padding: 16,
-        }}
-      >
-        <DialogPanel style={{ ...styles.card, width: "min(520px, 95vw)" }}>
+      <div style={styles.modalContainer}>
+        <DialogPanel style={{ ...styles.card, ...styles.modalPanel }}>
           <div style={styles.headerBar}>
             <div>
               <DialogTitle style={styles.sectionTitle}>{username}</DialogTitle>
diff --git a/frontend/src/index.css b/frontend/src/index.css
index 87e53e4..cff81bb 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -1,4 +1,8 @@
 :root {
+  --bg-default: #f6f8fa;
+  --text-default: #24292f;
+  --border-default: #d0d7de;
+  --focus-ring: rgba(9, 105, 218, 0.22);
   font-synthesis: none;
   text-rendering: optimizeLegibility;
   -webkit-font-smoothing: antialiased;
@@ -14,4 +18,27 @@ body,
 
 body {
   margin: 0;
+  background: var(--bg-default);
+  color: var(--text-default);
+  font-family: "IBM Plex Sans", "Noto Sans", "Liberation Sans", "Segoe UI", sans-serif;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+button,
+input,
+select,
+textarea {
+  font: inherit;
+}
+
+input:focus,
+button:focus-visible,
+select:focus,
+textarea:focus {
+  border-color: #0969da;
+  box-shadow: 0 0 0 3px var(--focus-ring);
+  outline: none;
 }
diff --git a/frontend/src/pages/DatasetStatus.tsx b/frontend/src/pages/DatasetStatus.tsx
index 8421125..919e48d 100644
--- a/frontend/src/pages/DatasetStatus.tsx
+++ b/frontend/src/pages/DatasetStatus.tsx
@@ -78,9 +78,9 @@ const DatasetStatusPage = () => {
 
   return (
     <div style={styles.page}>
-      <div style={{ ...styles.container, maxWidth: 720 }}>
+      <div style={styles.containerNarrow}>
         <div style={{ ...styles.card, marginTop: 28 }}>
-          <h1 style={{ margin: 0, fontSize: 28, color: "#111827" }}>
+          <h1 style={styles.sectionHeaderTitle}>
             {isProcessing ? "Processing dataset..." : isError ? "Dataset processing failed" : "Dataset ready"}
           </h1>
 
@@ -94,11 +94,10 @@ const DatasetStatusPage = () => {
           <div
             style={{
               ...styles.card,
-              marginTop: 12,
+              ...styles.statusMessageCard,
               borderColor: isError ? "rgba(185, 28, 28, 0.28)" : "rgba(0,0,0,0.06)",
               background: isError ? "#fff5f5" : "#ffffff",
               color: isError ? "#991b1b" : "#374151",
-              boxShadow: "none",
             }}
           >
             {statusMessage || (isProcessing ? "Waiting for updates from the worker queue..." : "No details provided.")}
diff --git a/frontend/src/pages/Datasets.tsx b/frontend/src/pages/Datasets.tsx
index 7734224..b054420 100644
--- a/frontend/src/pages/Datasets.tsx
+++ b/frontend/src/pages/Datasets.tsx
@@ -55,11 +55,11 @@ const DatasetsPage = () => {
 
   return (
     <div style={styles.page}>
-      <div style={{ ...styles.container, maxWidth: 1100 }}>
+      <div style={styles.containerWide}>
         <div style={{ ...styles.card, ...styles.headerBar }}>
           <div>
-            <h1 style={{ margin: 0, color: "#111827", fontSize: 28 }}>My Datasets</h1>
-            <p style={{ margin: "8px 0 0", color: "#6b7280", fontSize: 14 }}>
+            <h1 style={styles.sectionHeaderTitle}>My Datasets</h1>
+            <p style={styles.sectionHeaderSubtitle}>
               View and reopen datasets you previously uploaded.
             </p>
           </div>
@@ -91,7 +91,7 @@ const DatasetsPage = () => {
 
         {!error && datasets.length > 0 && (
           <div style={{ ...styles.card, marginTop: 14, padding: 0, overflow: "hidden" }}>
-            <ul style={{ listStyle: "none", margin: 0, padding: 0 }}>
+            <ul style={styles.listNoBullets}>
               {datasets.map((dataset) => {
                 const isComplete = dataset.status === "complete";
                 const targetPath = isComplete
@@ -101,24 +101,17 @@ const DatasetsPage = () => {
                 return (
                   <li
                     key={dataset.id}
-                    style={{
-                      display: "flex",
-                      alignItems: "center",
-                      justifyContent: "space-between",
-                      gap: 12,
-                      padding: "14px 16px",
-                      borderBottom: "1px solid rgba(0,0,0,0.06)",
-                    }}
+                    style={styles.datasetListItem}
                   >
                     <div style={{ minWidth: 0 }}>
-                      <div style={{ fontWeight: 700, color: "#111827" }}>
+                      <div style={styles.datasetName}>
                         {dataset.name || `Dataset #${dataset.id}`}
                       </div>
-                      <div style={{ fontSize: 13, color: "#6b7280", marginTop: 4 }}>
+                      <div style={styles.datasetMeta}>
                         ID #{dataset.id} • Status: {dataset.status || "unknown"}
                       </div>
                       {dataset.status_message && (
-                        <div style={{ fontSize: 13, color: "#6b7280", marginTop: 2 }}>
+                        <div style={styles.datasetMetaSecondary}>
                           {dataset.status_message}
                         </div>
                       )}
diff --git a/frontend/src/pages/Login.tsx b/frontend/src/pages/Login.tsx
index 65ff0c6..5aaaa54 100644
--- a/frontend/src/pages/Login.tsx
+++ b/frontend/src/pages/Login.tsx
@@ -6,11 +6,6 @@ import StatsStyling from "../styles/stats_styling";
 const API_BASE_URL = import.meta.env.VITE_BACKEND_URL
 
 const styles = StatsStyling;
-const controlStyle = {
-  width: "100%",
-  maxWidth: "100%",
-  boxSizing: "border-box" as const,
-};
 
 const LoginPage = () => {
   const navigate = useNavigate();
@@ -77,54 +72,44 @@ const LoginPage = () => {
   };
 
   return (
-    <div style={{ ...styles.container, maxWidth: 560, padding: "48px 24px" }}>
-        <div
-          style={{
-            ...styles.card,
-            padding: 28,
-            background:
-              "linear-gradient(180deg, rgba(255,255,255,1) 0%, rgba(248,250,255,1) 100%)",
-          }}
-        >
-          <div style={{ marginBottom: 22, textAlign: "center" }}>
-            <h1 style={{ margin: 0, color: "#111827", fontSize: 30, lineHeight: 1.1 }}>
+    <div style={styles.containerAuth}>
+        <div style={{ ...styles.card, ...styles.authCard }}>
+          <div style={styles.headingBlock}>
+            <h1 style={styles.headingXl}>
               {isRegisterMode ? "Create your account" : "Welcome back"}
             </h1>
-            <p style={{ margin: "8px 0 0", color: "#6b7280", fontSize: 14 }}>
+            <p style={styles.mutedText}>
               {isRegisterMode
                 ? "Register to start uploading and exploring your dataset insights."
                 : "Sign in to continue to your analytics workspace."}
             </p>
           </div>
 
-          <form
-            onSubmit={handleSubmit}
-            style={{ display: "grid", gap: 12, maxWidth: 380, margin: "0 auto" }}
-          >
+          <form onSubmit={handleSubmit} style={styles.authForm}>
             <input
               type="text"
               placeholder="Username"
-              style={{ ...styles.input, ...controlStyle }}
+              style={{ ...styles.input, ...styles.authControl }}
               value={username}
               onChange={(event) => setUsername(event.target.value)}
               required
             />
 
             {isRegisterMode && (
-              <input
-                type="email"
-                placeholder="Email"
-                style={{ ...styles.input, ...controlStyle }}
-                value={email}
-                onChange={(event) => setEmail(event.target.value)}
-                required
+                <input
+                  type="email"
+                  placeholder="Email"
+                  style={{ ...styles.input, ...styles.authControl }}
+                  value={email}
+                  onChange={(event) => setEmail(event.target.value)}
+                  required
               />
             )}
 
             <input
               type="password"
               placeholder="Password"
-              style={{ ...styles.input, ...controlStyle }}
+              style={{ ...styles.input, ...styles.authControl }}
               value={password}
               onChange={(event) => setPassword(event.target.value)}
               required
@@ -132,7 +117,7 @@ const LoginPage = () => {
 
             <button
               type="submit"
-              style={{ ...styles.buttonPrimary, ...controlStyle, marginTop: 2 }}
+              style={{ ...styles.buttonPrimary, ...styles.authControl, marginTop: 2 }}
               disabled={loading}
             >
               {loading
@@ -144,57 +129,24 @@ const LoginPage = () => {
           </form>
 
           {error && (
-            <p
-              style={{
-                color: "#b91c1c",
-                margin: "12px auto 0",
-                fontSize: 14,
-                maxWidth: 380,
-                textAlign: "center",
-              }}
-            >
+            <p style={styles.authErrorText}>
               {error}
             </p>
           )}
 
           {info && (
-            <p
-              style={{
-                color: "#166534",
-                margin: "12px auto 0",
-                fontSize: 14,
-                maxWidth: 380,
-                textAlign: "center",
-              }}
-            >
+            <p style={styles.authInfoText}>
               {info}
             </p>
           )}
 
-          <div
-            style={{
-              marginTop: 16,
-              display: "flex",
-              alignItems: "center",
-              justifyContent: "center",
-              gap: 8,
-              flexWrap: "wrap",
-            }}
-          >
-            <span style={{ color: "#6b7280", fontSize: 14 }}>
+          <div style={styles.authSwitchRow}>
+            <span style={styles.authSwitchLabel}>
               {isRegisterMode ? "Already have an account?" : "New here?"}
             </span>
             <button
               type="button"
-              style={{
-                border: "none",
-                background: "transparent",
-                color: "#2563eb",
-                fontSize: 14,
-                fontWeight: 600,
-                cursor: "pointer",
-                padding: 0,
-              }}
+                style={styles.authSwitchButton}
               onClick={() => {
                 setError("");
                 setInfo("");
diff --git a/frontend/src/pages/Stats.tsx b/frontend/src/pages/Stats.tsx
index cd46a7a..49a62a6 100644
--- a/frontend/src/pages/Stats.tsx
+++ b/frontend/src/pages/Stats.tsx
@@ -174,11 +174,11 @@ return (
         </button>
       </div>
 
-          <div style={{ fontSize: 13, color: "#6b7280" }}>Analytics Dashboard</div>
-          <div style={{ fontSize: 13, color: "#6b7280" }}>Dataset #{datasetId ?? "-"}</div>
+          <div style={styles.dashboardMeta}>Analytics Dashboard</div>
+          <div style={styles.dashboardMeta}>Dataset #{datasetId ?? "-"}</div>
         </div>
 
-    <div style={{ ...styles.container, display: "flex", gap: 8, marginTop: 12 }}>
+    <div style={{ ...styles.container, ...styles.tabsRow }}>
       <button
         onClick={() => setActiveView("summary")}
         style={activeView === "summary" ? styles.buttonPrimary : styles.buttonSecondary}
diff --git a/frontend/src/pages/Upload.tsx b/frontend/src/pages/Upload.tsx
index 881fb15..93383dc 100644
--- a/frontend/src/pages/Upload.tsx
+++ b/frontend/src/pages/Upload.tsx
@@ -70,11 +70,11 @@ const UploadPage = () => {
 
   return (
     <div style={styles.page}>
-      <div style={{ ...styles.container, maxWidth: 1100 }}>
+      <div style={styles.containerWide}>
         <div style={{ ...styles.card, ...styles.headerBar }}>
           <div>
-            <h1 style={{ margin: 0, color: "#111827", fontSize: 28 }}>Upload Dataset</h1>
-            <p style={{ margin: "8px 0 0", color: "#6b7280", fontSize: 14 }}>
+            <h1 style={styles.sectionHeaderTitle}>Upload Dataset</h1>
+            <p style={styles.sectionHeaderSubtitle}>
               Name your dataset, then upload posts and topic map files to generate analytics.
             </p>
           </div>
@@ -96,10 +96,10 @@ const UploadPage = () => {
           }}
         >
           <div style={{ ...styles.card, gridColumn: "auto" }}>
-            <h2 style={{ ...styles.sectionTitle, color: "#111827" }}>Dataset Name</h2>
+            <h2 style={{ ...styles.sectionTitle, color: "#24292f" }}>Dataset Name</h2>
             <p style={styles.sectionSubtitle}>Use a clear label so you can identify this upload later.</p>
             <input
-              style={{ ...styles.input, width: "100%", maxWidth: "100%", boxSizing: "border-box" }}
+              style={{ ...styles.input, ...styles.inputFullWidth }}
               type="text"
               placeholder="Example: Cork Discussions - Jan 2026"
               value={datasetName}
@@ -108,29 +108,29 @@ const UploadPage = () => {
           </div>
 
           <div style={{ ...styles.card, gridColumn: "auto" }}>
-            <h2 style={{ ...styles.sectionTitle, color: "#111827" }}>Posts File (.jsonl)</h2>
+            <h2 style={{ ...styles.sectionTitle, color: "#24292f" }}>Posts File (.jsonl)</h2>
             <p style={styles.sectionSubtitle}>Upload the raw post records export.</p>
             <input
-              style={{ ...styles.input, width: "100%", maxWidth: "100%", boxSizing: "border-box" }}
+              style={{ ...styles.input, ...styles.inputFullWidth }}
               type="file"
               accept=".jsonl"
               onChange={(event) => setPostFile(event.target.files?.[0] ?? null)}
             />
-            <p style={{ margin: "10px 0 0", fontSize: 13, color: "#374151" }}>
+            <p style={styles.subtleBodyText}>
               {postFile ? `Selected: ${postFile.name}` : "No file selected"}
             </p>
           </div>
 
           <div style={{ ...styles.card, gridColumn: "auto" }}>
-            <h2 style={{ ...styles.sectionTitle, color: "#111827" }}>Topics File (.json)</h2>
+            <h2 style={{ ...styles.sectionTitle, color: "#24292f" }}>Topics File (.json)</h2>
             <p style={styles.sectionSubtitle}>Upload your topic bucket mapping file.</p>
             <input
-              style={{ ...styles.input, width: "100%", maxWidth: "100%", boxSizing: "border-box" }}
+              style={{ ...styles.input, ...styles.inputFullWidth }}
               type="file"
               accept=".json"
               onChange={(event) => setTopicBucketFile(event.target.files?.[0] ?? null)}
             />
-            <p style={{ margin: "10px 0 0", fontSize: 13, color: "#374151" }}>
+            <p style={styles.subtleBodyText}>
               {topicBucketFile ? `Selected: ${topicBucketFile.name}` : "No file selected"}
             </p>
           </div>
@@ -140,10 +140,7 @@ const UploadPage = () => {
           style={{
             ...styles.card,
             marginTop: 14,
-            borderColor: hasError ? "rgba(185, 28, 28, 0.28)" : "rgba(0,0,0,0.06)",
-            background: hasError ? "#fff5f5" : "#ffffff",
-            color: hasError ? "#991b1b" : "#374151",
-            fontSize: 14,
+            ...(hasError ? styles.alertCardError : styles.alertCardInfo),
           }}
         >
           {returnMessage || "After upload, your dataset is queued for processing and you'll land on stats."}
diff --git a/frontend/src/styles/stats/appLayout.ts b/frontend/src/styles/stats/appLayout.ts
new file mode 100644
index 0000000..b680ea6
--- /dev/null
+++ b/frontend/src/styles/stats/appLayout.ts
@@ -0,0 +1,42 @@
+import { palette } from "./palette";
+import type { StyleMap } from "./types";
+
+export const appLayoutStyles: StyleMap = {
+  appHeaderWrap: {
+    padding: "16px 24px 0",
+  },
+
+  appHeaderBrandRow: {
+    display: "flex",
+    alignItems: "center",
+    gap: 10,
+    flexWrap: "wrap",
+  },
+
+  appTitle: {
+    margin: 0,
+    color: palette.textPrimary,
+    fontSize: 18,
+    fontWeight: 600,
+  },
+
+  authStatusBadge: {
+    padding: "3px 8px",
+    borderRadius: 6,
+    fontSize: 12,
+    fontWeight: 600,
+    fontFamily: '"IBM Plex Sans", "Noto Sans", "Liberation Sans", "Segoe UI", sans-serif',
+  },
+
+  authStatusSignedIn: {
+    border: `1px solid ${palette.statusPositiveBorder}`,
+    background: palette.statusPositiveBg,
+    color: palette.statusPositiveText,
+  },
+
+  authStatusSignedOut: {
+    border: `1px solid ${palette.statusNegativeBorder}`,
+    background: palette.statusNegativeBg,
+    color: palette.statusNegativeText,
+  },
+};
diff --git a/frontend/src/styles/stats/auth.ts b/frontend/src/styles/stats/auth.ts
new file mode 100644
index 0000000..abc82b5
--- /dev/null
+++ b/frontend/src/styles/stats/auth.ts
@@ -0,0 +1,92 @@
+import { palette } from "./palette";
+import type { StyleMap } from "./types";
+
+export const authStyles: StyleMap = {
+  containerAuth: {
+    maxWidth: 560,
+    margin: "0 auto",
+    padding: "48px 24px",
+  },
+
+  headingXl: {
+    margin: 0,
+    color: palette.textPrimary,
+    fontSize: 28,
+    fontWeight: 600,
+    lineHeight: 1.1,
+  },
+
+  headingBlock: {
+    marginBottom: 22,
+    textAlign: "center",
+  },
+
+  mutedText: {
+    margin: "8px 0 0",
+    color: palette.textSecondary,
+    fontSize: 14,
+  },
+
+  authCard: {
+    padding: 28,
+  },
+
+  authForm: {
+    display: "grid",
+    gap: 12,
+    maxWidth: 380,
+    margin: "0 auto",
+  },
+
+  inputFullWidth: {
+    width: "100%",
+    maxWidth: "100%",
+    boxSizing: "border-box",
+  },
+
+  authControl: {
+    width: "100%",
+    maxWidth: "100%",
+    boxSizing: "border-box",
+  },
+
+  authErrorText: {
+    color: palette.dangerText,
+    margin: "12px auto 0",
+    fontSize: 14,
+    maxWidth: 380,
+    textAlign: "center",
+  },
+
+  authInfoText: {
+    color: palette.successText,
+    margin: "12px auto 0",
+    fontSize: 14,
+    maxWidth: 380,
+    textAlign: "center",
+  },
+
+  authSwitchRow: {
+    marginTop: 16,
+    display: "flex",
+    alignItems: "center",
+    justifyContent: "center",
+    gap: 8,
+    flexWrap: "wrap",
+  },
+
+  authSwitchLabel: {
+    color: palette.textSecondary,
+    fontSize: 14,
+  },
+
+  authSwitchButton: {
+    border: "none",
+    background: "transparent",
+    color: palette.brandGreenBorder,
+    fontSize: 14,
+    fontWeight: 600,
+    cursor: "pointer",
+    padding: 0,
+  },
+};
diff --git a/frontend/src/styles/stats/cards.ts b/frontend/src/styles/stats/cards.ts
new file mode 100644
index 0000000..ab388a9
--- /dev/null
+++ b/frontend/src/styles/stats/cards.ts
@@ -0,0 +1,42 @@
+import { palette } from "./palette";
+import type { StyleMap } from "./types";
+
+export const cardStyles: StyleMap = {
+  cardBase: {
+    background: palette.surface,
+    border: `1px solid ${palette.borderDefault}`,
+    borderRadius: 8,
+    padding: 14,
+    boxShadow: `0 1px 0 ${palette.shadowSubtle}`,
+    minHeight: 88,
+  },
+
+  cardTopRow: {
+    display: "flex",
+    justifyContent: "space-between",
+    alignItems: "center",
+    gap: 10,
+  },
+
+  cardLabel: {
+    fontSize: 12,
+    fontWeight: 600,
+    color: palette.textSecondary,
+    letterSpacing: "0.02em",
+    textTransform: "uppercase",
+  },
+
+  cardValue: {
+    fontSize: 24,
+    fontWeight: 700,
+    marginTop: 6,
+    letterSpacing: "-0.02em",
+    color: palette.textPrimary,
+  },
+
+  cardSubLabel: {
+    marginTop: 6,
+    fontSize: 12,
+    color: palette.textSecondary,
+  },
+};
diff --git a/frontend/src/styles/stats/datasets.ts b/frontend/src/styles/stats/datasets.ts
new file mode 100644
index 0000000..a2e2d28
--- /dev/null
+++ b/frontend/src/styles/stats/datasets.ts
@@ -0,0 +1,55 @@
+import { palette } from "./palette";
+import type { StyleMap } from "./types";
+
+export const datasetStyles: StyleMap = {
+  sectionHeaderTitle: {
+    margin: 0,
+    color: palette.textPrimary,
+    fontSize: 28,
+    fontWeight: 600,
+  },
+
+  sectionHeaderSubtitle: {
+    margin: "8px 0 0",
+    color: palette.textSecondary,
+    fontSize: 14,
+  },
+
+  listNoBullets: {
+    listStyle: "none",
+    margin: 0,
+    padding: 0,
+  },
+
+  datasetListItem: {
+    display: "flex",
+    alignItems: "center",
+    justifyContent: "space-between",
+    gap: 12,
+    padding: "14px 16px",
+    borderBottom: `1px solid ${palette.borderMuted}`,
+  },
+
+  datasetName: {
+    fontWeight: 600,
+    color: palette.textPrimary,
+  },
+
+  datasetMeta: {
+    fontSize: 13,
+    color: palette.textSecondary,
+    marginTop: 4,
+  },
+
+  datasetMetaSecondary: {
+    fontSize: 13,
+    color: palette.textSecondary,
+    marginTop: 2,
+  },
+
+  subtleBodyText: {
+    margin: "10px 0 0",
+    fontSize: 13,
+    color: palette.textBody,
+  },
+};
diff --git a/frontend/src/styles/stats/emotional.ts b/frontend/src/styles/stats/emotional.ts
new file mode 100644
index 0000000..6ad68ce
--- /dev/null
+++ b/frontend/src/styles/stats/emotional.ts
@@ -0,0 +1,51 @@
+import { palette } from "./palette";
+import type { StyleMap } from "./types";
+
+export const emotionalStyles: StyleMap = {
+  emotionalSummaryRow: {
+    display: "flex",
+    flexWrap: "wrap",
+    gap: 10,
+    fontSize: 13,
+    color: palette.textTertiary,
+    marginTop: 6,
+  },
+
+  emotionalTopicLabel: {
+    fontSize: 12,
+    fontWeight: 600,
+    color: palette.textSecondary,
+    letterSpacing: "0.02em",
+    textTransform: "uppercase",
+  },
+
+  emotionalTopicValue: {
+    fontSize: 24,
+    fontWeight: 800,
+    marginTop: 4,
+    lineHeight: 1.2,
+  },
+
+  emotionalMetricRow: {
+    display: "flex",
+    justifyContent: "space-between",
+    alignItems: "center",
+    marginTop: 10,
+    fontSize: 13,
+    color: palette.textSecondary,
+  },
+
+  emotionalMetricRowCompact: {
+    display: "flex",
+    justifyContent: "space-between",
+    alignItems: "center",
+    marginTop: 4,
+    fontSize: 13,
+    color: palette.textSecondary,
+  },
+
+  emotionalMetricValue: {
+    fontWeight: 600,
+    color: palette.textPrimary,
+  },
+};
diff --git a/frontend/src/styles/stats/feedback.ts b/frontend/src/styles/stats/feedback.ts
new file mode 100644
index 0000000..33cbe2d
--- /dev/null
+++ b/frontend/src/styles/stats/feedback.ts
@@ -0,0 +1,34 @@
+import { palette } from "./palette";
+import type { StyleMap } from "./types";
+
+export const feedbackStyles: StyleMap = {
+  alertCardError: {
+    borderColor: palette.alertErrorBorder,
+    background: palette.alertErrorBg,
+    color: palette.alertErrorText,
+    fontSize: 14,
+  },
+
+  alertCardInfo: {
+    borderColor: palette.alertInfoBorder,
+    background: palette.surface,
+    color: palette.textBody,
+    fontSize: 14,
+  },
+
+  statusMessageCard: {
+    marginTop: 12,
+    boxShadow: "none",
+  },
+
+  dashboardMeta: {
+    fontSize: 13,
+    color: palette.textSecondary,
+  },
+
+  tabsRow: {
+    display: "flex",
+    gap: 8,
+    marginTop: 12,
+  },
+};
diff --git a/frontend/src/styles/stats/foundations.ts b/frontend/src/styles/stats/foundations.ts
new file mode 100644
index 0000000..7801824
--- /dev/null
+++ b/frontend/src/styles/stats/foundations.ts
@@ -0,0 +1,157 @@
+import { palette } from "./palette";
+import type { StyleMap } from "./types";
+
+export const foundationStyles: StyleMap = {
+  appShell: {
+    minHeight: "100vh",
+    background: palette.canvas,
+    fontFamily: '"IBM Plex Sans", "Noto Sans", "Liberation Sans", "Segoe UI", sans-serif',
+    color: palette.textPrimary,
+  },
+
+  page: {
+    width: "100%",
+    minHeight: "100vh",
+    padding: 20,
+    background: palette.canvas,
+    fontFamily: '"IBM Plex Sans", "Noto Sans", "Liberation Sans", "Segoe UI", sans-serif',
+    color: palette.textPrimary,
+    overflowX: "hidden",
+    boxSizing: "border-box",
+  },
+
+  container: {
+    maxWidth: 1240,
+    margin: "0 auto",
+  },
+
+  containerWide: {
+    maxWidth: 1100,
+    margin: "0 auto",
+  },
+
+  containerNarrow: {
+    maxWidth: 720,
+    margin: "0 auto",
+  },
+
+  card: {
+    background: palette.surface,
+    borderRadius: 8,
+    padding: 16,
+    border: `1px solid ${palette.borderDefault}`,
+    boxShadow: `0 1px 0 ${palette.shadowSubtle}`,
+  },
+
+  headerBar: {
+    display: "flex",
+    flexWrap: "wrap",
+    alignItems: "center",
+    justifyContent: "space-between",
+    gap: 10,
+  },
+
+  controls: {
+    display: "flex",
+    gap: 8,
+    alignItems: "center",
+  },
+
+  controlsWrapped: {
+    display: "flex",
+    gap: 8,
+    alignItems: "center",
+    flexWrap: "wrap",
+  },
+
+  input: {
+    width: 280,
+    maxWidth: "70vw",
+    padding: "8px 10px",
+    borderRadius: 6,
+    border: `1px solid ${palette.borderDefault}`,
+    outline: "none",
+    fontSize: 14,
+    background: palette.surface,
+    color: palette.textPrimary,
+  },
+
+  buttonPrimary: {
+    padding: "8px 12px",
+    borderRadius: 6,
+    border: `1px solid ${palette.brandGreenBorder}`,
+    background: palette.brandGreen,
+    color: palette.surface,
+    fontWeight: 600,
+    cursor: "pointer",
+    boxShadow: "none",
+  },
+
+  buttonSecondary: {
+    padding: "8px 12px",
+    borderRadius: 6,
+    border: `1px solid ${palette.borderDefault}`,
+    background: palette.canvas,
+    color: palette.textPrimary,
+    fontWeight: 600,
+    cursor: "pointer",
+  },
+
+  grid: {
+    marginTop: 12,
+    display: "grid",
+    gridTemplateColumns: "repeat(12, 1fr)",
+    gap: 12,
+  },
+
+  sectionTitle: {
+    margin: 0,
+    fontSize: 17,
+    fontWeight: 600,
+  },
+
+  sectionSubtitle: {
+    margin: "6px 0 14px",
+    fontSize: 13,
+    color: palette.textSecondary,
+  },
+
+  chartWrapper: {
+    width: "100%",
+    height: 350,
+  },
+
+  heatmapWrapper: {
+    width: "100%",
+    height: 320,
+  },
+
+  topUsersList: {
+    display: "flex",
+    flexDirection: "column",
+    gap: 10,
+  },
+
+  topUserItem: {
+    padding: "10px 12px",
+    borderRadius: 8,
+    background: palette.canvas,
+    border: `1px solid ${palette.borderMuted}`,
+  },
+
+  topUserName: {
+    fontWeight: 600,
+    fontSize: 14,
+    color: palette.textPrimary,
+  },
+
+  topUserMeta: {
+    fontSize: 13,
+    color: palette.textSecondary,
+  },
+
+  scrollArea: {
+    maxHeight: 420,
+    overflowY: "auto",
+  },
+};
diff --git a/frontend/src/styles/stats/modal.ts b/frontend/src/styles/stats/modal.ts
new file mode 100644
index 0000000..596ee00
--- /dev/null
+++ b/frontend/src/styles/stats/modal.ts
@@ -0,0 +1,28 @@
+import { palette } from "./palette";
+import type { StyleMap } from "./types";
+
+export const modalStyles: StyleMap = {
+  modalRoot: {
+    position: "relative",
+    zIndex: 50,
+  },
+
+  modalBackdrop: {
+    position: "fixed",
+    inset: 0,
+    background: palette.modalBackdrop,
+  },
+
+  modalContainer: {
+    position: "fixed",
+    inset: 0,
+    display: "flex",
+    alignItems: "center",
+    justifyContent: "center",
+    padding: 16,
+  },
+
+  modalPanel: {
+    width: "min(520px, 95vw)",
+  },
+};
diff --git a/frontend/src/styles/stats/palette.ts b/frontend/src/styles/stats/palette.ts
new file mode 100644
index 0000000..a4943ae
--- /dev/null
+++ b/frontend/src/styles/stats/palette.ts
@@ -0,0 +1,26 @@
+export const palette = {
+  canvas: "#f6f8fa",
+  surface: "#ffffff",
+  textPrimary: "#24292f",
+  textSecondary: "#57606a",
+  textTertiary: "#4b5563",
+  textBody: "#374151",
+  borderDefault: "#d0d7de",
+  borderMuted: "#d8dee4",
+  shadowSubtle: "rgba(27, 31, 36, 0.04)",
+  brandGreen: "#2da44e",
+  brandGreenBorder: "#1f883d",
+  statusPositiveBorder: "#b7dfc8",
+  statusPositiveBg: "#edf9f1",
+  statusPositiveText: "#1f6f43",
+  statusNegativeBorder: "#f3c1c1",
+  statusNegativeBg: "#fff2f2",
+  statusNegativeText: "#9a2929",
+  dangerText: "#b91c1c",
+  successText: "#166534",
+  alertErrorBorder: "rgba(185, 28, 28, 0.28)",
+  alertErrorBg: "#fff5f5",
+  alertErrorText: "#991b1b",
+  alertInfoBorder: "rgba(0,0,0,0.06)",
+  modalBackdrop: "rgba(0,0,0,0.45)",
+} as const;
diff --git a/frontend/src/styles/stats/types.ts b/frontend/src/styles/stats/types.ts
new file mode 100644
index 0000000..74d3d2e
--- /dev/null
+++ b/frontend/src/styles/stats/types.ts
@@ -0,0 +1,3 @@
+import type { CSSProperties } from "react";
+
+export type StyleMap = Record<string, CSSProperties>;
diff --git a/frontend/src/styles/stats_styling.tsx b/frontend/src/styles/stats_styling.tsx
index e942a7f..9397214 100644
--- a/frontend/src/styles/stats_styling.tsx
+++ b/frontend/src/styles/stats_styling.tsx
@@ -1,136 +1,22 @@
 import type { CSSProperties } from "react";
+import { appLayoutStyles } from "./stats/appLayout";
+import { authStyles } from "./stats/auth";
+import { cardStyles } from "./stats/cards";
+import { datasetStyles } from "./stats/datasets";
+import { emotionalStyles } from "./stats/emotional";
+import { feedbackStyles } from "./stats/feedback";
+import { foundationStyles } from "./stats/foundations";
+import { modalStyles } from "./stats/modal";
 
 const StatsStyling: Record<string, CSSProperties> = {
-  page: {
-    width: "100%",
-    minHeight: "100vh",
-    padding: 24,
-    background: "#f6f7fb",
-    fontFamily:
-      '-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Arial, sans-serif',
-    color: "#111827",
-    overflowX: "hidden",
-    boxSizing: "border-box"
-  },
-
-
-  container: {
-    maxWidth: 1400,
-    margin: "0 auto",
-  },
-
-  card: {
-    background: "white",
-    borderRadius: 16,
-    padding: 16,
-    border: "1px solid rgba(0,0,0,0.06)",
-    boxShadow: "0 6px 20px rgba(0,0,0,0.06)",
-  },
-
-  headerBar: {
-    display: "flex",
-    flexWrap: "wrap",
-    alignItems: "center",
-    justifyContent: "space-between",
-    gap: 12,
-  },
-
-  controls: {
-    display: "flex",
-    gap: 10,
-    alignItems: "center",
-  },
-
-  input: {
-    width: 320,
-    maxWidth: "70vw",
-    padding: "10px 12px",
-    borderRadius: 12,
-    border: "1px solid rgba(0,0,0,0.12)",
-    outline: "none",
-    fontSize: 14,
-    background: "#fff",
-    color: "black"
-  },
-
-  buttonPrimary: {
-    padding: "10px 14px",
-    borderRadius: 12,
-    border: "1px solid rgba(0,0,0,0.08)",
-    background: "#2563eb",
-    color: "white",
-    fontWeight: 600,
-    cursor: "pointer",
-    boxShadow: "0 6px 16px rgba(37,99,235,0.25)",
-  },
-
-  buttonSecondary: {
-    padding: "10px 14px",
-    borderRadius: 12,
-    border: "1px solid rgba(0,0,0,0.12)",
-    background: "#fff",
-    color: "#111827",
-    fontWeight: 600,
-    cursor: "pointer",
-  },
-
-  grid: {
-    marginTop: 18,
-    display: "grid",
-    gridTemplateColumns: "repeat(12, 1fr)",
-    gap: 16,
-  },
-
-  sectionTitle: {
-    margin: 0,
-    fontSize: 16,
-    fontWeight: 700,
-  },
-
-  sectionSubtitle: {
-    margin: "6px 0 14px",
-    fontSize: 13,
-    color: "#6b7280",
-  },
-
-  chartWrapper: {
-    width: "100%",
-    height: 350,
-  },
-
-  heatmapWrapper: {
-    width: "100%",
-    height: 320,
-  },
-
-  topUsersList: {
-    display: "flex",
-    flexDirection: "column",
-    gap: 10,
-  },
-
-  topUserItem: {
-    padding: "10px 12px",
-    borderRadius: 12,
-    background: "#f9fafb",
-    border: "1px solid rgba(0,0,0,0.06)",
-  },
-
-  topUserName: {
-    fontWeight: 700,
-    fontSize: 14,
-    color: "black"
-  },
-
-  topUserMeta: {
-    fontSize: 13,
-    color: "#6b7280",
-  },
-
-  scrollArea: {
-    maxHeight: 450,
-    overflowY: "auto",
-  },
+  ...foundationStyles,
+  ...appLayoutStyles,
+  ...authStyles,
+  ...datasetStyles,
+  ...feedbackStyles,
+  ...cardStyles,
+  ...emotionalStyles,
+  ...modalStyles,
 };
 
-export default StatsStyling;
\ No newline at end of file
+export default StatsStyling;