Enhance calculator modifiers and UI styling

static/style.css

@@ -56,6 +56,12 @@ h1 {
     margin-bottom: 20px;
 }
 
+.af-body h2,
+.af-body h3,
+.af-body h4 {
+    color: #f8fafc;
+}
+
 .background-roster {
     background-color: rgba(255, 255, 255, 0.8); /* Semi-transparent background for better readability */
     padding: 20px;
@@ -579,26 +585,50 @@ body.menu-open {
 .af-nav {
     display: flex;
     align-items: center;
-    gap: 12px;
+    gap: 10px;
+    padding: 6px;
+    border-radius: 999px;
+    background: rgba(15, 23, 42, 0.65);
+    border: 1px solid rgba(148, 163, 184, 0.3);
+    box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.1);
 }
 
 .af-nav-link {
-    padding: 8px 16px;
+    position: relative;
+    padding: 10px 18px;
     border-radius: 999px;
     text-decoration: none;
     font-weight: 600;
     color: #e2e8f0;
-    background: rgba(148, 163, 184, 0.12);
+    background: transparent;
     border: 1px solid transparent;
     transition: all 0.2s ease;
 }
 
 .af-nav-link:hover {
     border-color: rgba(56, 189, 248, 0.4);
-    background: rgba(56, 189, 248, 0.2);
+    background: rgba(56, 189, 248, 0.15);
     color: #f8fafc;
 }
 
+.af-nav-link::after {
+    content: "";
+    position: absolute;
+    left: 16px;
+    right: 16px;
+    bottom: 6px;
+    height: 2px;
+    border-radius: 999px;
+    background: linear-gradient(90deg, rgba(56, 189, 248, 0), rgba(56, 189, 248, 0.9), rgba(34, 197, 94, 0.9), rgba(34, 197, 94, 0));
+    opacity: 0;
+    transition: opacity 0.2s ease;
+}
+
+.af-nav-link:hover::after,
+.af-nav-link:focus-visible::after {
+    opacity: 1;
+}
+
 .af-nav-toggle {
     display: none;
     padding: 8px 16px;
@@ -842,6 +872,131 @@ body.menu-open {
     margin-top: 20px;
 }
 
+.af-stat-grid {
+    display: grid;
+    gap: 16px;
+    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
+    margin-top: 24px;
+}
+
+.af-stat-card {
+    padding: 16px;
+    border-radius: 16px;
+    border: 1px solid rgba(148, 163, 184, 0.2);
+    background: rgba(2, 6, 23, 0.6);
+}
+
+.af-stat-label {
+    margin: 0 0 6px;
+    font-size: 0.75rem;
+    text-transform: uppercase;
+    letter-spacing: 0.08em;
+    color: #94a3b8;
+}
+
+.af-stat-value {
+    margin: 0;
+    font-size: 1.4rem;
+    font-weight: 700;
+    color: #f8fafc;
+}
+
+.af-list {
+    margin: 16px 0 0;
+    padding-left: 20px;
+    color: #cbd5f5;
+    line-height: 1.7;
+}
+
+.af-pill-grid {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 10px;
+    margin-top: 16px;
+}
+
+.af-pill {
+    padding: 8px 12px;
+    border-radius: 999px;
+    background: rgba(56, 189, 248, 0.15);
+    border: 1px solid rgba(56, 189, 248, 0.35);
+    color: #e2e8f0;
+    font-size: 0.85rem;
+    font-weight: 600;
+}
+
+.af-modifier-stack {
+    display: grid;
+    gap: 18px;
+    margin-top: 16px;
+}
+
+.af-modifier-subset {
+    display: grid;
+    gap: 12px;
+}
+
+.af-modifier-title {
+    margin: 0;
+    font-size: 0.85rem;
+    text-transform: uppercase;
+    letter-spacing: 0.08em;
+    color: #94a3b8;
+}
+
+.af-checkbox-grid {
+    display: grid;
+    gap: 10px;
+}
+
+.af-checkbox {
+    display: flex;
+    gap: 10px;
+    align-items: flex-start;
+    padding: 12px;
+    border-radius: 12px;
+    border: 1px solid rgba(148, 163, 184, 0.2);
+    background: rgba(2, 6, 23, 0.55);
+    color: #e2e8f0;
+    font-size: 0.9rem;
+    line-height: 1.4;
+}
+
+.af-checkbox input[type="checkbox"] {
+    margin-top: 2px;
+}
+
+.af-checkbox.is-disabled {
+    opacity: 0.5;
+}
+
+.af-active-modifiers {
+    margin-top: 20px;
+    padding-top: 16px;
+    border-top: 1px solid rgba(148, 163, 184, 0.2);
+}
+
+.af-tag-list {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+}
+
+.af-tag {
+    padding: 6px 12px;
+    border-radius: 999px;
+    background: rgba(15, 23, 42, 0.8);
+    border: 1px solid rgba(148, 163, 184, 0.25);
+    color: #e2e8f0;
+    font-size: 0.8rem;
+}
+
+.af-empty-hint {
+    margin: 0;
+    color: #94a3b8;
+    font-size: 0.9rem;
+}
+
 @media (max-width: 820px) {
     .af-header {
         flex-wrap: wrap;