diff --git a/frontend/src/style.css b/frontend/src/style.css
index 848b4f0..ca086b3 100644
--- a/frontend/src/style.css
+++ b/frontend/src/style.css
@@ -1,69 +1,244 @@
 :root {
-  color-scheme: light;
+  color-scheme: dark;
   font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
-  background: #f6f4ef;
-  color: #17201b;
+  background: #090909;
+  color: #f5f5f5;
 }
 
-* { box-sizing: border-box; }
-body { margin: 0; min-height: 100vh; background: radial-gradient(circle at top left, #e8fff5, #f6f4ef 34%, #fffaf0); }
-button, input { font: inherit; }
-button { cursor: pointer; }
-code { background: #eef3ee; border-radius: 6px; padding: 2px 5px; }
-
-.loading { min-height: 100vh; display: grid; place-items: center; color: #59655e; }
-.studio-shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 32px 0 56px; display: grid; gap: 18px; }
-.hero { display: grid; grid-template-columns: 1fr minmax(240px, 320px); gap: 24px; align-items: end; padding: 26px; border: 1px solid #dbe5d8; border-radius: 28px; background: rgba(255,255,255,0.72); box-shadow: 0 24px 70px rgba(32, 64, 48, 0.10); }
-.eyebrow { margin: 0 0 10px; color: #0f7b58; text-transform: uppercase; letter-spacing: .12em; font-size: 12px; font-weight: 800; }
-h1, h2, p { margin-top: 0; }
-h1 { max-width: 780px; margin-bottom: 14px; font-size: clamp(38px, 7vw, 78px); line-height: .92; letter-spacing: -0.06em; }
-h2 { margin-bottom: 10px; font-size: 24px; letter-spacing: -0.03em; }
-.lede { max-width: 760px; margin-bottom: 0; color: #526158; font-size: 18px; line-height: 1.55; }
-.session-card { border: 1px solid #dce6d9; border-radius: 20px; padding: 18px; background: #fff; display: grid; gap: 8px; color: #5d675f; }
-.session-card strong { color: #17201b; overflow-wrap: anywhere; }
-
-.panel { border: 1px solid #dde6da; border-radius: 24px; background: rgba(255,255,255,.86); padding: 22px; box-shadow: 0 18px 50px rgba(32, 64, 48, 0.08); }
-.workflow { display: grid; gap: 18px; }
-.controls-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 14px; }
-label { display: grid; gap: 7px; color: #405047; font-weight: 700; }
-input { width: 100%; border: 1px solid #cfdacf; border-radius: 12px; background: #fff; color: #17201b; padding: 11px 12px; }
-input:focus { outline: 3px solid #b7ebd8; border-color: #18966b; }
-.hint { margin: 0; color: #5d675f; }
-.warning { color: #9d4a13; font-weight: 800; }
-
-.quote-table { display: grid; gap: 8px; overflow-x: auto; }
-.quote-row { min-width: 860px; display: grid; grid-template-columns: 1.5fr .8fr .65fr .8fr .9fr auto; gap: 8px; align-items: center; }
-.quote-head { color: #66756c; font-weight: 900; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; padding: 0 4px; }
-.actions { display: flex; flex-wrap: wrap; gap: 10px; }
-.button { border: 0; border-radius: 999px; background: #116b4f; color: #fff; padding: 12px 18px; font-weight: 900; text-decoration: none; display: inline-flex; justify-content: center; align-items: center; }
-.button:hover { background: #0b513b; }
-.button:disabled { opacity: .55; cursor: not-allowed; }
-.secondary { border: 1px solid #cbd8cd; background: #fff; color: #174535; }
-.secondary:hover { background: #eff8f3; }
-.ghost { border: 0; background: transparent; color: #8b3c26; font-weight: 800; padding: 8px; }
-
-.upload-panel { display: grid; grid-template-columns: 1fr minmax(220px, 360px) auto; gap: 16px; align-items: center; }
-.upload-panel p { margin-bottom: 0; color: #526158; line-height: 1.5; }
-.status { border-radius: 18px; background: #17201b; color: #eafff5; padding: 14px 18px; font-weight: 800; }
-.empty-state { color: #526158; }
-.empty-state p { margin-bottom: 0; }
-.result { display: grid; grid-template-columns: minmax(260px, 380px) 1fr; gap: 18px; }
-.error-result { display: block; border-color: #f0c7b7; background: #fff8f4; }
-.error-result p { color: #70331e; }
-.error-result li { margin: 6px 0; }
-.recommendation { border-radius: 20px; background: linear-gradient(145deg, #0f7b58, #123f31); color: white; padding: 22px; }
-.recommendation h2 { font-size: 36px; margin-bottom: 10px; }
-.recommendation .eyebrow { color: #baf4df; }
-.recommendation p { color: #e7fff4; line-height: 1.5; }
-.recommendation small { color: #bfe8d8; overflow-wrap: anywhere; }
-.ranking { display: grid; gap: 10px; }
-.rank-card { border: 1px solid #dce6d9; border-radius: 18px; background: #fff; padding: 16px; display: grid; gap: 6px; }
-.rank-card strong { font-size: 18px; }
-.rank-card span { color: #526158; }
-
-@media (max-width: 880px) {
-  .hero, .controls-grid, .upload-panel, .result { grid-template-columns: 1fr; }
-  .studio-shell { width: min(100% - 20px, 1180px); padding-top: 10px; }
-  .hero { padding: 20px; border-radius: 22px; }
-  h1 { font-size: clamp(36px, 14vw, 58px); }
+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  min-height: 100vh;
+  background: #090909;
+}
+
+button,
+textarea {
+  font: inherit;
+}
+
+button {
+  cursor: pointer;
+}
+
+.loading {
+  min-height: 100vh;
+  display: grid;
+  place-items: center;
+  color: #b8b8b8;
+}
+
+.app-shell {
+  min-height: 100vh;
+  display: grid;
+  grid-template-columns: minmax(260px, 340px) 1fr;
+}
+
+.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%;
+  min-height: 58px;
+  border: 1px solid #252525;
+  border-radius: 8px;
+  background: #121212;
+  color: #f3f3f3;
+  padding: 12px 14px;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+  text-align: left;
+}
+
+.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;
+  }
 }