diff --git a/frontend/src/style.css b/frontend/src/style.css
index ca086b3..204e4ca 100644
--- a/frontend/src/style.css
+++ b/frontend/src/style.css
@@ -1,244 +1,156 @@
 :root {
-  color-scheme: dark;
+  color: #172033;
+  background: #f5f7fb;
   font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
-  background: #090909;
-  color: #f5f5f5;
+  line-height: 1.5;
 }
 
-* {
-  box-sizing: border-box;
-}
-
-body {
-  margin: 0;
-  min-height: 100vh;
-  background: #090909;
-}
-
-button,
-textarea {
-  font: inherit;
-}
-
-button {
-  cursor: pointer;
-}
+* { box-sizing: border-box; }
+body { margin: 0; min-width: 320px; }
+button, input, textarea { font: inherit; }
+button, a { transition: 0.18s ease; }
 
 .loading {
   min-height: 100vh;
   display: grid;
   place-items: center;
-  color: #b8b8b8;
+  color: #526070;
 }
 
-.app-shell {
-  min-height: 100vh;
+.product-shell {
+  width: min(1180px, calc(100% - 32px));
+  margin: 0 auto;
+  padding: 32px 0 56px;
+}
+
+.hero {
   display: grid;
-  grid-template-columns: minmax(260px, 340px) 1fr;
+  grid-template-columns: minmax(0, 1fr) 320px;
+  gap: 24px;
+  align-items: stretch;
+  margin-bottom: 24px;
 }
 
-.sidebar {
-  min-height: 100vh;
-  border-right: 1px solid #222;
-  background: #0d0d0d;
-  padding: 28px;
-  display: grid;
-  align-content: start;
-  gap: 28px;
+.hero > div:first-child, .session-card, .builder-card, .result-card, .history-card {
+  background: rgba(255, 255, 255, 0.92);
+  border: 1px solid #dfe7f2;
+  border-radius: 24px;
+  box-shadow: 0 18px 50px rgba(31, 46, 78, 0.08);
 }
 
-.eyebrow {
-  margin: 0 0 10px;
-  color: #8bd8c6;
-  font-size: 12px;
-  letter-spacing: 0;
-  text-transform: uppercase;
-}
+.hero > div:first-child { padding: 34px; }
+.hero h1 { font-size: clamp(2rem, 4vw, 4rem); line-height: 1.02; margin: 8px 0 16px; letter-spacing: -0.05em; }
+.hero p { color: #526070; font-size: 1.05rem; max-width: 760px; }
+.eyebrow { margin: 0; color: #4f46e5; text-transform: uppercase; font-size: 0.78rem; letter-spacing: 0.13em; font-weight: 800; }
 
-h1,
-h2,
-h3,
-p {
-  margin-top: 0;
-}
-
-h1 {
-  margin-bottom: 10px;
-  font-size: clamp(32px, 5vw, 56px);
-  line-height: 0.95;
-  letter-spacing: 0;
-}
-
-h2 {
-  margin-bottom: 0;
-  font-size: 30px;
-  letter-spacing: 0;
-}
-
-h3 {
-  margin-bottom: 12px;
-  color: #d7d7d7;
-  font-size: 14px;
-  letter-spacing: 0;
-}
-
-.agent-meta {
-  margin-bottom: 0;
-  color: #a6a6a6;
-}
-
-.skill-list {
-  display: grid;
-  gap: 10px;
-}
-
-.skill {
-  width: 100%;
-  min-height: 58px;
-  border: 1px solid #252525;
-  border-radius: 8px;
-  background: #121212;
-  color: #f3f3f3;
-  padding: 12px 14px;
+.session-card {
+  padding: 24px;
   display: flex;
+  flex-direction: column;
+  justify-content: center;
+  gap: 8px;
+}
+.session-card span { color: #64748b; font-size: 0.9rem; }
+.session-card strong { word-break: break-word; }
+.session-card a, button {
+  border: 0;
+  border-radius: 14px;
+  background: #4f46e5;
+  color: white;
+  text-decoration: none;
+  font-weight: 800;
+  padding: 12px 16px;
+  cursor: pointer;
+  text-align: center;
+}
+button:hover, .session-card a:hover { background: #4338ca; transform: translateY(-1px); }
+button:disabled { background: #a5b4fc; cursor: not-allowed; transform: none; }
+
+.grid {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.8fr);
+  gap: 24px;
+}
+
+.builder-card, .result-card, .history-card { padding: 24px; }
+.field { display: grid; gap: 8px; margin-bottom: 18px; }
+label { font-weight: 800; color: #24324a; }
+input[type="text"], input:not([type]), textarea, .schema-input {
+  width: 100%;
+  border: 1px solid #cad5e2;
+  border-radius: 16px;
+  background: #fbfdff;
+  color: #111827;
+  padding: 12px 14px;
+}
+input[type="file"] { border: 1px dashed #9aa8bd; padding: 18px; border-radius: 16px; width: 100%; background: #fbfdff; }
+small { color: #64748b; }
+.schema-input { min-height: 330px; resize: vertical; font-family: "SFMono-Regular", Consolas, monospace; font-size: 0.92rem; }
+.builder-card button { width: 100%; margin-top: 4px; }
+
+.alert {
+  border-radius: 16px;
+  background: #eef2ff;
+  color: #3730a3;
+  padding: 12px 14px;
+  margin: 12px 0;
+  font-weight: 650;
+}
+.alert.error { background: #fef2f2; color: #b91c1c; }
+
+.card-header {
+  display: flex;
+  gap: 16px;
   align-items: center;
   justify-content: space-between;
-  gap: 16px;
-  text-align: left;
+  margin-bottom: 18px;
 }
+.card-header h2 { margin: 4px 0 0; }
+.card-header button { background: #0f172a; padding: 10px 13px; font-size: 0.9rem; }
 
-.skill:hover,
-.skill.active {
-  border-color: #5bb7a7;
-  background: #15201d;
+.result-body dl {
+  display: grid;
+  gap: 10px;
+  margin: 0 0 22px;
 }
-
-.skill span {
-  overflow-wrap: anywhere;
+dl div {
+  display: grid;
+  grid-template-columns: 120px 1fr;
+  gap: 10px;
+  padding: 10px 0;
+  border-bottom: 1px solid #e5edf6;
 }
+dt { color: #64748b; font-weight: 800; }
+dd { margin: 0; word-break: break-word; }
 
-.skill small {
-  color: #9d9d9d;
+.mapping-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
+.mapping-list li {
+  display: flex;
+  justify-content: space-between;
+  gap: 12px;
+  padding: 12px;
+  background: #f8fafc;
+  border: 1px solid #e5edf6;
+  border-radius: 14px;
 }
+.mapping-list span { color: #64748b; }
+.empty { color: #64748b; }
 
-.session {
-  border: 1px solid #252525;
-  border-radius: 8px;
-  padding: 14px;
-  color: #a6a6a6;
+.history-card { margin-top: 24px; }
+.receipt-list { display: grid; gap: 10px; }
+.receipt-list article {
   display: grid;
   gap: 4px;
-}
-
-.session strong {
-  color: #f3f3f3;
-  overflow-wrap: anywhere;
-}
-
-.workbench {
-  padding: 28px;
-  display: grid;
-  align-content: start;
-  gap: 22px;
-}
-
-.toolbar {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 18px;
-}
-
-.toolbar a,
-.runner button {
-  border: 1px solid #e8e8e8;
-  border-radius: 7px;
-  background: #f4f4f4;
-  color: #111;
-  padding: 10px 14px;
-  text-decoration: none;
-  white-space: nowrap;
-}
-
-.runner {
-  display: grid;
-  gap: 12px;
-}
-
-.runner label {
-  display: grid;
-  gap: 10px;
-  color: #d7d7d7;
-}
-
-.runner textarea {
-  width: 100%;
-  min-height: 170px;
-  resize: vertical;
-  border: 1px solid #252525;
-  border-radius: 8px;
-  background: #070707;
-  color: #eeeeee;
+  border: 1px solid #e5edf6;
+  border-radius: 14px;
+  background: #f8fafc;
   padding: 14px;
-  line-height: 1.5;
-  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
 }
+.receipt-list span { color: #334155; }
 
-.runner button {
-  justify-self: start;
-}
-
-.runner button:disabled {
-  cursor: wait;
-  opacity: 0.72;
-}
-
-.panels {
-  display: grid;
-  grid-template-columns: repeat(2, minmax(0, 1fr));
-  gap: 16px;
-}
-
-.panel {
-  min-width: 0;
-  border: 1px solid #252525;
-  border-radius: 8px;
-  padding: 16px;
-  background: #0d0d0d;
-}
-
-pre {
-  min-height: 260px;
-  max-height: 420px;
-  margin: 0;
-  overflow: auto;
-  color: #dcdcdc;
-  line-height: 1.5;
-  font-size: 13px;
-  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
-}
-
-.empty {
-  color: #aaa;
-}
-
-@media (max-width: 820px) {
-  .app-shell {
-    grid-template-columns: 1fr;
-  }
-
-  .sidebar {
-    min-height: auto;
-    border-right: 0;
-    border-bottom: 1px solid #222;
-  }
-
-  .panels {
-    grid-template-columns: 1fr;
-  }
-
-  .toolbar {
-    align-items: flex-start;
-    flex-direction: column;
-  }
+@media (max-width: 900px) {
+  .hero, .grid { grid-template-columns: 1fr; }
+  .product-shell { width: min(100% - 20px, 760px); padding-top: 16px; }
+  .hero > div:first-child, .session-card, .builder-card, .result-card, .history-card { border-radius: 18px; padding: 20px; }
+  dl div { grid-template-columns: 1fr; gap: 2px; }
 }