style: add responsive CSS tweaks for very narrow screens, mobile fullscreen windows, and safe-area toast positioning

devplacepy/static/css/landing.css

@@ -16,42 +16,6 @@
     pointer-events: none;
 }
 
-.landing-nav {
-    display: flex;
-    align-items: center;
-    justify-content: space-between;
-    padding: 1rem 2rem;
-    position: relative;
-    z-index: 1;
-}
-
-.landing-logo {
-    font-size: 1.5rem;
-    font-weight: 800;
-    color: var(--text-primary);
-    letter-spacing: -0.02em;
-}
-
-.landing-logo span {
-    color: var(--accent);
-}
-
-.landing-nav-links {
-    display: flex;
-    align-items: center;
-    gap: 1.5rem;
-}
-
-.landing-nav-links a {
-    color: var(--text-secondary);
-    font-size: 0.875rem;
-    font-weight: 500;
-}
-
-.landing-nav-links a:hover {
-    color: var(--text-primary);
-}
-
 .landing-hero {
     display: flex;
     flex-direction: column;
@@ -304,9 +268,6 @@
     .landing-features {
         grid-template-columns: repeat(2, 1fr);
     }
-    .landing-nav {
-        padding: 0.75rem 1rem;
-    }
     .landing-section {
         padding: 0 1rem;
     }