diff --git a/6-space-game/solution/index.html b/6-space-game/solution/index.html
index d3810d93..d8674fc5 100644
--- a/6-space-game/solution/index.html
+++ b/6-space-game/solution/index.html
@@ -19,6 +19,318 @@
   <!-- Optional PWA hooks (files to be created later) -->
   <link rel="manifest" href="manifest.webmanifest">
 </head>
+  <style>
+    /* Space Game — CSS */
+/* Typography + Theme */
+:root {
+  --bg: #070a1a;
+  --bg-2: #0b1023;
+  --panel: rgba(12, 17, 38, 0.75);
+  --panel-solid: #0c1126;
+  --primary: #5ac8fa;
+  --accent: #a78bfa;
+  --danger: #ff6b6b;
+  --success: #34d399;
+  --warning: #fbbf24;
+  --text: #e6eaf2;
+  --muted: #9aa4bf;
+  --border: #192243;
+  --shadow: rgba(0, 0, 0, 0.6);
+}
+
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
+}
+
+html, body {
+  height: 100%;
+}
+
+body {
+  margin: 0;
+  color: var(--text);
+  background:
+    radial-gradient(circle at 20% 10%, #0f1533 0%, transparent 50%),
+    radial-gradient(circle at 80% 30%, #0b1b3a 0%, transparent 40%),
+    radial-gradient(circle at 30% 80%, #111a39 0%, transparent 40%),
+    var(--bg);
+  font-family: "Poppins", system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
+  line-height: 1.5;
+}
+
+/* Header + Nav */
+header {
+  position: sticky;
+  top: 0;
+  z-index: 20;
+  background: linear-gradient(180deg, rgba(7,10,26,0.85) 0%, rgba(7,10,26,0.6) 100%);
+  backdrop-filter: blur(6px);
+  border-bottom: 1px solid var(--border);
+  padding: 0.75rem 1rem;
+}
+
+header h1 {
+  margin: 0;
+  font-family: "Orbitron", "Poppins", sans-serif;
+  font-weight: 800;
+  letter-spacing: 0.5px;
+  display: inline-flex;
+  align-items: center;
+  gap: 0.6rem;
+}
+
+nav[aria-label="Primary"] {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.5rem;
+  margin-top: 0.5rem;
+}
+
+nav[aria-label="Primary"] button {
+  appearance: none;
+  border: 1px solid var(--border);
+  background: linear-gradient(180deg, #121a3a 0%, #0d1430 100%);
+  color: var(--text);
+  border-radius: 10px;
+  padding: 0.55rem 0.85rem;
+  display: inline-flex;
+  align-items: center;
+  gap: 0.5rem;
+  cursor: pointer;
+  transition: transform 0.06s ease, box-shadow 0.2s ease, border-color 0.2s ease;
+  box-shadow: 0 2px 12px var(--shadow);
+}
+
+nav[aria-label="Primary"] button:hover {
+  border-color: var(--primary);
+  box-shadow: 0 4px 18px rgba(90, 200, 250, 0.25);
+}
+
+nav[aria-label="Primary"] button:active {
+  transform: translateY(1px) scale(0.98);
+}
+
+nav [data-action="start"] { background: linear-gradient(180deg, #10314a 0%, #0d2438 100%); }
+nav [data-action="pause"] { background: linear-gradient(180deg, #1a1f3f 0%, #131936 100%); }
+nav [data-action="reset"] { background: linear-gradient(180deg, #3b0d0d 0%, #2a0a0a 100%); }
+nav [data-action="mute"][aria-pressed="true"] { background: linear-gradient(180deg, #3f1a1a 0%, #2a0e0e 100%); }
+nav [data-action="fullscreen"] { background: linear-gradient(180deg, #162c3a 0%, #0f2331 100%); }
+nav [data-action="open-settings"] { background: linear-gradient(180deg, #1a1440 0%, #13103a 100%); }
+
+/* Main Layout */
+main {
+  max-width: 1200px;
+  margin: 0 auto;
+  padding: 1rem;
+}
+
+/* HUD overlay */
+#hud {
+  position: fixed;
+  left: 50%;
+  top: 64px;
+  transform: translateX(-50%);
+  width: min(100% - 2rem, 1180px);
+  z-index: 15;
+}
+
+#hud [role="status"] {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.75rem 1rem;
+  align-items: center;
+  background: var(--panel);
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  padding: 0.5rem 0.75rem;
+  backdrop-filter: blur(4px);
+}
+
+#hud span {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.4rem;
+  color: var(--muted);
+  font-weight: 600;
+}
+
+#hud output {
+  color: var(--primary);
+  font-family: "Orbitron", "Poppins", sans-serif;
+  letter-spacing: 0.4px;
+}
+
+/* Canvas section */
+#play {
+  position: relative;
+  margin-top: 1rem;
+}
+
+#play figure {
+  margin: 0;
+  border: 1px solid var(--border);
+  border-radius: 14px;
+  background:
+    radial-gradient(1200px 600px at 70% 30%, rgba(70, 78, 150, 0.15), transparent 60%),
+    radial-gradient(800px 400px at 20% 70%, rgba(88, 131, 186, 0.12), transparent 60%),
+    #081022;
+  box-shadow: 0 8px 28px rgba(0,0,0,0.45), inset 0 0 0 1px rgba(255,255,255,0.02);
+  overflow: hidden;
+}
+
+#play figcaption {
+  position: absolute;
+  z-index: 5;
+  inset: 0 auto auto 0;
+  margin: 0.5rem 0 0 0.5rem;
+  padding: 0.25rem 0.5rem;
+  background: rgba(8, 16, 34, 0.7);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  color: var(--muted);
+  font-size: 0.85rem;
+}
+
+#myCanvas {
+  display: block;
+  width: 100%;
+  height: auto;
+  background: linear-gradient(180deg, #000814 0%, #001d3d 100%);
+}
+
+/* Help + Leaderboard */
+#help, #leaderboard {
+  margin-top: 1rem;
+  background: var(--panel);
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  padding: 1rem;
+}
+
+#help h2, #leaderboard h2 {
+  margin-top: 0;
+  font-family: "Orbitron", "Poppins", sans-serif;
+}
+
+#help ul {
+  margin: 0.5rem 0 0 1rem;
+  padding: 0;
+}
+
+#scores {
+  margin: 0.5rem 0 0 1rem;
+  padding: 0;
+}
+
+#scores li {
+  margin: 0.25rem 0;
+  color: var(--text);
+}
+
+/* Dialogs */
+dialog {
+  border: 1px solid var(--border);
+  border-radius: 14px;
+  padding: 1rem;
+  background: var(--panel-solid);
+  color: var(--text);
+  width: min(520px, calc(100% - 2rem));
+  box-shadow: 0 24px 60px rgba(0,0,0,0.55);
+}
+
+dialog header h2 {
+  margin: 0 0 0.5rem 0;
+  font-family: "Orbitron", "Poppins", sans-serif;
+}
+
+dialog section {
+  display: grid;
+  gap: 0.75rem;
+  margin-bottom: 0.5rem;
+}
+
+dialog label {
+  font-size: 0.95rem;
+  color: var(--muted);
+}
+
+dialog input[type="range"],
+dialog select,
+dialog input[type="url"],
+dialog input[type="file"] {
+  width: 100%;
+  color: var(--text);
+  background: #0f1733;
+  border: 1px solid var(--border);
+  border-radius: 10px;
+  padding: 0.5rem;
+}
+
+dialog menu {
+  display: flex;
+  justify-content: flex-end;
+  gap: 0.5rem;
+  margin: 0;
+  padding: 0.5rem 0 0 0;
+}
+
+dialog button {
+  appearance: none;
+  border: 1px solid var(--border);
+  background: linear-gradient(180deg, #121a3a 0%, #0d1430 100%);
+  color: var(--text);
+  border-radius: 10px;
+  padding: 0.5rem 0.85rem;
+  cursor: pointer;
+}
+
+dialog::backdrop {
+  background: rgba(3, 6, 20, 0.6);
+  backdrop-filter: blur(3px);
+}
+
+/* Footer */
+footer {
+  margin: 1rem 0;
+  color: var(--muted);
+  text-align: center;
+}
+
+/* Focus styles */
+:focus-visible {
+  outline: 2px solid var(--primary);
+  outline-offset: 2px;
+  border-radius: 6px;
+}
+
+/* Fullscreen adjustments */
+#play:fullscreen, /* section fullscreen */
+#myCanvas:fullscreen {
+  background: #000;
+}
+
+#play:fullscreen #myCanvas,
+#myCanvas:fullscreen {
+  width: 100vw;
+  height: 100vh;
+}
+
+/* Small screens */
+@media (max-width: 600px) {
+  #hud [role="status"] {
+    justify-content: space-between;
+  }
+  nav[aria-label="Primary"] {
+    gap: 0.4rem;
+  }
+  nav[aria-label="Primary"] button {
+    padding: 0.5rem 0.65rem;
+  }
+}
+
+  </style>
 <body>
 
   <a href="#play" aria-label="Skip to game">Skip to Game</a>