diff --git a/app/static/app.css b/app/static/app.css
index 4646ad0..e6040da 100644
--- a/app/static/app.css
+++ b/app/static/app.css
@@ -151,6 +151,12 @@ h3 {
   grid-template-columns: 1fr;
 }
 
+.play-layout {
+  display: grid;
+  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
+  gap: 14px;
+}
+
 .chip-row {
   display: flex;
   flex-wrap: wrap;
@@ -243,6 +249,43 @@ h3 {
   color: var(--muted);
 }
 
+.join-row {
+  margin-top: 8px;
+  display: flex;
+  gap: 8px;
+}
+
+.join-row input {
+  flex: 1;
+  min-width: 0;
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  padding: 9px 10px;
+  font: inherit;
+  text-transform: uppercase;
+}
+
+.play-meta {
+  margin-top: 12px;
+}
+
+.play-meta p {
+  margin: 0 0 6px;
+}
+
+.board-panel {
+  display: grid;
+  place-items: center;
+}
+
+#chess-canvas {
+  width: min(100%, 640px);
+  height: auto;
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  background: #fefefe;
+}
+
 .flash-stack {
   margin-bottom: 14px;
   display: grid;
@@ -294,8 +337,222 @@ h3 {
     flex-direction: column;
   }
 
+  .play-layout {
+    grid-template-columns: 1fr;
+  }
+
+  .game-stage {
+    grid-template-columns: 1fr;
+  }
+
+  .join-row {
+    flex-direction: column;
+  }
+
   .friend-card {
     flex-direction: column;
     align-items: flex-start;
   }
 }
+
+.hidden {
+  display: none !important;
+}
+
+.play-page {
+  display: grid;
+  gap: 14px;
+}
+
+.code-badge {
+  margin-top: 6px;
+  display: inline-block;
+  font-size: 1.5rem;
+  font-weight: 700;
+  letter-spacing: 0.08em;
+  border: 1px dashed var(--border);
+  border-radius: 8px;
+  padding: 10px 14px;
+  background: var(--surface-soft);
+}
+
+.waiting-meta {
+  margin-top: 10px;
+}
+
+.waiting-meta p {
+  margin: 0 0 6px;
+}
+
+.game-stage {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) 300px;
+  gap: 14px;
+}
+
+.game-sidebar p {
+  margin: 0 0 8px;
+}
+
+.captured-row {
+  min-height: 28px;
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  background: var(--surface-soft);
+  padding: 6px 8px;
+  font-size: 1.15rem;
+}
+
+.fen-box {
+  width: 100%;
+  min-height: 94px;
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  background: var(--surface-soft);
+  color: var(--text);
+  font:
+    0.85rem/1.3 ui-monospace,
+    SFMono-Regular,
+    Menlo,
+    Consolas,
+    monospace;
+  padding: 8px;
+  resize: vertical;
+}
+
+.play-modal {
+  position: fixed;
+  inset: 0;
+  background: rgba(15, 23, 42, 0.42);
+  display: grid;
+  place-items: center;
+  z-index: 30;
+  padding: 16px;
+}
+
+.play-modal-card {
+  width: min(440px, 100%);
+  border: 1px solid var(--border);
+  background: var(--surface);
+  border-radius: 10px;
+  padding: 14px;
+}
+
+@media (max-width: 980px) {
+  .game-stage {
+    grid-template-columns: 1fr;
+  }
+}
+
+.captured-piece {
+  width: 20px;
+  height: 20px;
+  object-fit: contain;
+  margin-right: 3px;
+  vertical-align: middle;
+}
+
+.player-strip {
+  width: min(100%, 640px);
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 10px;
+  border-radius: 8px;
+  padding: 8px 10px;
+}
+
+.player-main {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  min-width: 0;
+}
+
+.player-name {
+  font-weight: 700;
+}
+
+.player-time {
+  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
+  font-weight: 700;
+}
+
+.player-meta {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-width: 0;
+}
+
+.capture-strip {
+  display: inline-flex;
+  align-items: center;
+  min-height: 24px;
+}
+
+.material-pill {
+  border: 1px solid var(--border);
+  background: var(--surface);
+  border-radius: 999px;
+  padding: 2px 8px;
+  font-size: 0.85rem;
+  min-width: 36px;
+  text-align: center;
+}
+
+.move-list-wrap {
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  overflow: hidden;
+  background: var(--surface-soft);
+  max-height: 280px;
+  overflow-y: auto;
+}
+
+.move-table {
+  width: 100%;
+  border-collapse: collapse;
+  font-variant-numeric: tabular-nums;
+}
+
+.move-table th,
+.move-table td {
+  text-align: left;
+  padding: 8px 10px;
+  border-bottom: 1px solid var(--border);
+}
+
+.move-table thead th {
+  background: #eef2f6;
+  font-size: 0.85rem;
+  color: var(--muted);
+  position: sticky;
+  top: 0;
+}
+
+.move-table tbody tr:last-child td {
+  border-bottom: 0;
+}
+
+.move-table td:first-child,
+.move-table th:first-child {
+  width: 48px;
+  color: var(--muted);
+}
+
+#chess-canvas {
+  width: min(100%, 640px);
+  aspect-ratio: 1 / 1;
+  height: auto;
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  background: #fefefe;
+}
+
+@media (max-width: 700px) {
+  .player-strip {
+    flex-direction: column;
+    align-items: flex-start;
+  }
+}