diff --git a/frontend/src/style.css b/frontend/src/style.css
index 17961c7..ca086b3 100644
--- a/frontend/src/style.css
+++ b/frontend/src/style.css
@@ -1,102 +1,244 @@
 :root {
-  color: #172033;
-  background: #f5f3ee;
+  color-scheme: dark;
   font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
-  font-synthesis: none;
-  text-rendering: optimizeLegibility;
+  background: #090909;
+  color: #f5f5f5;
 }
 
-* { box-sizing: border-box; }
-body { margin: 0; min-width: 320px; min-height: 100vh; }
-button, input, textarea { font: inherit; }
-button { cursor: pointer; }
-button:disabled { cursor: not-allowed; opacity: 0.55; }
-code { background: #eee7db; padding: 0.15rem 0.35rem; border-radius: 0.35rem; }
+* {
+  box-sizing: border-box;
+}
 
-.loading, .studio-shell { width: min(1180px, calc(100vw - 32px)); margin: 0 auto; }
-.loading { min-height: 100vh; display: grid; place-items: center; color: #665b4c; }
-.studio-shell { padding: 32px 0 48px; }
+body {
+  margin: 0;
+  min-height: 100vh;
+  background: #090909;
+}
 
-.hero {
+button,
+textarea {
+  font: inherit;
+}
+
+button {
+  cursor: pointer;
+}
+
+.loading {
+  min-height: 100vh;
   display: grid;
-  grid-template-columns: 1fr minmax(260px, 360px);
-  gap: 24px;
-  align-items: stretch;
-  margin-bottom: 24px;
+  place-items: center;
+  color: #b8b8b8;
 }
-.hero > div, .card, .auth-card {
-  background: rgba(255, 255, 255, 0.88);
-  border: 1px solid #e4d8c6;
-  border-radius: 28px;
-  box-shadow: 0 18px 60px rgba(74, 52, 26, 0.08);
-}
-.hero > div { padding: 36px; }
-.auth-card { padding: 28px; display: flex; flex-direction: column; justify-content: center; gap: 12px; }
-.eyebrow { margin: 0 0 8px; color: #956b2f; font-size: 0.78rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
-h1, h2, h3, p { margin-top: 0; }
-h1 { max-width: 760px; font-size: clamp(2.2rem, 6vw, 4.9rem); line-height: 0.95; letter-spacing: -0.07em; margin-bottom: 18px; }
-h2 { font-size: clamp(1.35rem, 3vw, 2rem); letter-spacing: -0.04em; margin-bottom: 6px; }
-h3 { margin-bottom: 12px; }
-.lede { max-width: 760px; color: #5d6472; font-size: 1.08rem; line-height: 1.6; }
-.meta-row { display: flex; flex-wrap: wrap; gap: 10px; }
-.meta-row span, .timeline small {
-  border: 1px solid #e9dcc7;
-  background: #fbf7ef;
-  border-radius: 999px;
-  padding: 8px 12px;
-  color: #6a5740;
-  font-size: 0.88rem;
-}
-.signin { display: inline-flex; align-self: flex-start; padding: 10px 14px; border-radius: 999px; color: #fff; background: #172033; text-decoration: none; font-weight: 700; }
 
-.grid { display: grid; grid-template-columns: 1.04fr 0.96fr; gap: 24px; align-items: start; }
-.card { padding: 24px; }
-.card-header { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; margin-bottom: 18px; }
-.button-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; }
-.ghost { border: 1px solid #dfd0ba; color: #5f4a2e; background: #fff8ed; border-radius: 999px; padding: 8px 11px; }
+.app-shell {
+  min-height: 100vh;
+  display: grid;
+  grid-template-columns: minmax(260px, 340px) 1fr;
+}
 
-.form-card { display: flex; flex-direction: column; gap: 16px; }
-label { display: grid; gap: 7px; color: #394150; font-weight: 700; }
-input, textarea {
+.sidebar {
+  min-height: 100vh;
+  border-right: 1px solid #222;
+  background: #0d0d0d;
+  padding: 28px;
+  display: grid;
+  align-content: start;
+  gap: 28px;
+}
+
+.eyebrow {
+  margin: 0 0 10px;
+  color: #8bd8c6;
+  font-size: 12px;
+  letter-spacing: 0;
+  text-transform: uppercase;
+}
+
+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%;
-  border: 1px solid #dacbb4;
-  border-radius: 16px;
+  min-height: 58px;
+  border: 1px solid #252525;
+  border-radius: 8px;
+  background: #121212;
+  color: #f3f3f3;
   padding: 12px 14px;
-  color: #172033;
-  background: #fffdf9;
-  outline: none;
-}
-input:focus, textarea:focus { border-color: #9c6b27; box-shadow: 0 0 0 3px rgba(156, 107, 39, 0.14); }
-textarea { min-height: 230px; resize: vertical; line-height: 1.5; }
-.file-box { border: 1px dashed #cdbb9f; border-radius: 18px; padding: 14px; background: #fffaf2; }
-.form-card button[type="submit"], .reload-card button {
-  border: 0;
-  border-radius: 18px;
-  background: #172033;
-  color: white;
-  padding: 14px 18px;
-  font-weight: 800;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+  text-align: left;
 }
 
-.result-card { min-height: 530px; }
-.alert, .failure { border: 1px solid #efb7a7; background: #fff0ec; color: #81341d; border-radius: 18px; padding: 14px; margin-bottom: 16px; }
-.empty { color: #707987; background: #f7f3eb; border-radius: 18px; padding: 18px; }
-.timeline ol { list-style: none; padding: 0; margin: 0 0 18px; border-left: 3px solid #d8bf97; }
-.timeline li { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0 12px 18px; position: relative; }
-.timeline li::before { content: ""; position: absolute; left: -7px; top: 18px; width: 11px; height: 11px; border-radius: 999px; background: #9c6b27; }
-.timeline li span { text-transform: capitalize; font-weight: 800; }
-time { color: #5a4630; font-variant-numeric: tabular-nums; }
-details { margin-top: 18px; }
-summary { cursor: pointer; color: #66513a; font-weight: 700; }
-pre { max-width: 100%; overflow: auto; white-space: pre-wrap; background: #151923; color: #eef3ff; padding: 14px; border-radius: 16px; font-size: 0.84rem; }
-
-.reload-card { margin-top: 24px; }
-.reload-card form { display: grid; grid-template-columns: 1fr minmax(220px, 320px) auto; gap: 16px; align-items: end; margin-bottom: 18px; }
-.reload-card p { color: #68717e; }
-
-@media (max-width: 880px) {
-  .hero, .grid, .reload-card form { grid-template-columns: 1fr; }
-  .hero > div { padding: 26px; }
-  .card-header { flex-direction: column; }
-  .button-row { justify-content: flex-start; }
+.skill:hover,
+.skill.active {
+  border-color: #5bb7a7;
+  background: #15201d;
+}
+
+.skill span {
+  overflow-wrap: anywhere;
+}
+
+.skill small {
+  color: #9d9d9d;
+}
+
+.session {
+  border: 1px solid #252525;
+  border-radius: 8px;
+  padding: 14px;
+  color: #a6a6a6;
+  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;
+  padding: 14px;
+  line-height: 1.5;
+  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
+}
+
+.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;
+  }
 }