diff --git a/docs/accessibility.md b/docs/accessibility.md
index 9047724..6245df6 100644
--- a/docs/accessibility.md
+++ b/docs/accessibility.md
@@ -1,7 +1,8 @@
 # Accessibility review
 
-This review covers keyboard-only use, screen reader structure, and 200% zoom
-(Stellar Wave issues #108, #109, #110, #111). It records what was verified
+This review covers keyboard-only use, screen reader structure, 200% zoom,
+link cues, heading hierarchy, command summaries, and high contrast mode
+(Stellar Wave issues #104, #105, #106, #107, #108, #109, #110, #111). It records what was verified
 automatically, what was fixed, and what still needs a manual pass.
 
 ## What is verified automatically
@@ -11,11 +12,15 @@ automatically, what was fixed, and what still needs a manual pass.
 | Keyboard | Skip link is first in tab order and moves focus to the page content | `tests/visual/accessibility.spec.ts` |
 | Keyboard | Every focusable control shows an outline on keyboard focus | `tests/visual/accessibility.spec.ts` |
 | Keyboard | Workflow tabs respond to arrow, Home and End keys | `src/App.test.tsx`, `tests/visual/accessibility.spec.ts` |
+| Non-color cues | Links have underline, offset, and cues on hover/active states beyond color (#104) | `src/styles.css`, `src/App.test.tsx` |
+| Screen reader | Module cards follow logical heading hierarchy h2 -> h3 -> h4 with labelled regions (#105) | `src/App.test.tsx` |
+| Screen reader | Active command and option settings are summarized in an accessible live region (#106) | `src/App.test.tsx` |
 | Keyboard | Each command in the limits example is reachable in order with Tab | `tests/visual/accessibility.spec.ts` |
 | Screen reader | Landmarks, a single `h1`, and named navigation links | `tests/visual/accessibility.spec.ts` |
 | Screen reader | Command selector is a labelled group of toggle buttons | `src/App.test.tsx`, `tests/visual/accessibility.spec.ts` |
 | Screen reader | Copy results are announced through a polite live region | `src/App.test.tsx`, `tests/visual/accessibility.spec.ts` |
 | Screen reader | Audit prerequisites are a labelled fieldset of checkboxes, each with its own accessible name | `src/App.test.tsx` |
+| High contrast | Controls, buttons, tabs, inputs, and cards retain boundaries in high-contrast/forced-colors modes (#107) | `src/styles.css`, `src/App.test.tsx` |
 | Zoom | No horizontal page scroll and no clipped controls at 640px and 320px CSS widths | `tests/visual/accessibility.spec.ts` |
 
 These checks read the accessibility tree and computed styles. They do not
@@ -52,3 +57,7 @@ browser and screen reader pair per platform.
 | 8 | The limits workflow needed a discoverable, ready-to-run command reference. | Fixed: added a focusable reference section and a build-and-run example with keyboard-focusable command steps. | `src/App.tsx`, `src/styles.css`, `tests/visual/accessibility.spec.ts` |
 | 9 | Scrollable `pre` blocks are not keyboard-focusable in every browser, so long lines may be unreachable by keyboard on some browsers. | Open. | `src/styles.css` |
 | 10 | The stored visual baselines in `tests/visual/__screenshots__` predate the current layout and do not match a fresh render. | Open. Baselines should be regenerated on the CI platform, not locally. | `tests/visual/` |
+| 11 | Hover and active link and button states relied solely on color changes (#104). | Fixed: added underlines, offsets, and elevation cues. | `src/styles.css` |
+| 12 | Module cards lacked structured heading levels for cards and their workflow groups (#105). | Fixed: established h2 -> h3 -> h4 hierarchy and region grouping. | `src/App.tsx` |
+| 13 | Active command parameters lacked a screen-reader accessible summary (#106). | Fixed: added polite live region and focusable summary card. | `src/App.tsx` |
+| 14 | Interactive controls and cards lost clear boundaries in high-contrast/forced-colors modes (#107). | Fixed: added forced-colors and prefers-contrast: more styling. | `src/styles.css` |
diff --git a/src/App.test.tsx b/src/App.test.tsx
index 05fa906..5d52ea7 100644
--- a/src/App.test.tsx
+++ b/src/App.test.tsx
@@ -728,6 +728,102 @@ describe("Navigation enhancements (#112, #113, #114, #115)", () => {
   });
 });
 
+describe("Accessibility enhancements (#104, #105, #106, #107)", () => {
+  it("provides logical heading hierarchy in modules section and cards (#105)", () => {
+    render(<App />);
+    const modulesSection = document.getElementById("modules");
+    expect(modulesSection).toHaveAttribute("aria-labelledby", "modules-heading");
+
+    const modulesHeading = document.getElementById("modules-heading");
+    expect(modulesHeading).not.toBeNull();
+    expect(modulesHeading).toHaveAttribute("id", "modules-heading");
+
+    const articles = document.querySelectorAll("article.module-card");
+    expect(articles.length).toBeGreaterThan(0);
+
+    articles.forEach((article) => {
+      const heading = article.querySelector("h3");
+      expect(heading).not.toBeNull();
+      const headingId = heading?.getAttribute("id");
+      expect(headingId).toBeTruthy();
+      expect(article).toHaveAttribute("aria-labelledby", headingId);
+
+      const workflowGroup = article.querySelector(".module-card-links");
+      expect(workflowGroup).toHaveAttribute("role", "group");
+      const h4 = workflowGroup?.querySelector("h4");
+      expect(h4).not.toBeNull();
+      expect(h4).toHaveTextContent("Available workflows");
+      expect(h4).toHaveClass("sr-only");
+    });
+  });
+
+  it("provides empty state heading when no modules match search filter (#105)", () => {
+    render(<App />);
+    const searchInput = screen.getByLabelText("Search modules by name or description");
+    fireEvent.change(searchInput, { target: { value: "nonexistent-module-xyz" } });
+
+    const emptyStatus = screen.getByRole("status");
+    expect(emptyStatus).toHaveAttribute("aria-labelledby", "module-empty-heading");
+
+    const emptyHeading = screen.getByRole("heading", { level: 3, name: /No modules match/i });
+    expect(emptyHeading).toHaveAttribute("id", "module-empty-heading");
+  });
+
+  it("provides screen-reader summary of active command configuration (#106)", () => {
+    render(<App />);
+    const summaryRegion = screen.getByRole("region", {
+      name: "Active command configuration summary",
+    });
+    expect(summaryRegion).toBeInTheDocument();
+    expect(summaryRegion).toHaveAttribute("tabindex", "0");
+
+    const srSummary = screen.getByTestId("active-command-sr-summary");
+    expect(srSummary).toHaveAttribute("aria-live", "polite");
+    expect(srSummary).toHaveAttribute("aria-atomic", "true");
+    expect(srSummary).toHaveTextContent("Active coverage command settings");
+
+    // Switching workflow updates the SR summary
+    const limitsTab = screen.getByRole("button", { name: "limits" });
+    fireEvent.click(limitsTab);
+
+    expect(srSummary).toHaveTextContent("Active limits command settings");
+  });
+
+  it("includes live region announcement for generated command output (#106)", () => {
+    render(<App />);
+    const generatedSrSummary = screen.getByTestId("generated-command-sr-summary");
+    expect(generatedSrSummary).toHaveAttribute("aria-live", "polite");
+    expect(generatedSrSummary).toHaveTextContent("soroban-testkit coverage");
+  });
+
+  it("supports non-color cues on links and active states (#104)", () => {
+    render(<App />);
+    const navLinks = screen.getAllByRole("link", { name: /^(Install|Modules|Commands)$/ });
+    const commandsLink = navLinks.find((l) => l.textContent === "Commands");
+    expect(commandsLink).toBeDefined();
+
+    fireEvent.click(commandsLink!);
+    expect(commandsLink).toHaveAttribute("aria-current", "location");
+
+    // All module card quick links have non-empty accessible text
+    const moduleLinks = document.querySelectorAll(".module-card-links a");
+    expect(moduleLinks.length).toBeGreaterThan(0);
+    moduleLinks.forEach((link) => {
+      expect(link.textContent?.trim().length).toBeGreaterThan(0);
+    });
+  });
+
+  it("ensures controls and summary cards have container boundaries for high contrast (#107)", () => {
+    render(<App />);
+    const summaryCard = document.querySelector(".summary-card");
+    expect(summaryCard).not.toBeNull();
+    expect(summaryCard).toHaveClass("summary-card");
+
+    const moduleCards = document.querySelectorAll(".module-card");
+    expect(moduleCards.length).toBeGreaterThan(0);
+  });
+});
+
 // #117 — mobile navigation menu
 describe("Mobile navigation menu", () => {
   it("renders the mobile menu toggle button", () => {
diff --git a/src/App.tsx b/src/App.tsx
index d179133..b503372 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -818,7 +818,7 @@ export default function App() {
         </aside>
       </section>
 
-      <section className="modules" id="modules" tabIndex={-1}>
+      <section className="modules" id="modules" aria-labelledby="modules-heading" tabIndex={-1}>
         {selectedModuleData ? (
           <article className="module-detail">
             {/* #136 — visible page title for deep-linked views */}
@@ -830,7 +830,7 @@ export default function App() {
               <span aria-current="page">{selectedModuleData.name}</span>
             </nav>
             <p className="eyebrow">{selectedModuleData.category}</p>
-            <h2>{selectedModuleData.name}</h2>
+            <h2 id="modules-heading">{selectedModuleData.name}</h2>
             <p>{selectedModuleData.description}</p>
             <button type="button" className="button secondary" onClick={() => setSelectedModule(null)}>
               Back to all modules
@@ -843,7 +843,7 @@ export default function App() {
             <div className="module-empty-icon" aria-hidden="true">
               !
             </div>
-            <h2>Module not found</h2>
+            <h2 id="modules-heading">Module not found</h2>
             <p>
               The module "{selectedModule}" does not exist in the Soroban Testkit library.
               Check the module name or browse the available modules below.
@@ -860,7 +860,7 @@ export default function App() {
           <>
             <header>
               <p className="eyebrow">One prelude. Seven focused modules.</p>
-              <h2>Everything a serious contract test needs.</h2>
+              <h2 id="modules-heading">Everything a serious contract test needs.</h2>
               <div className="module-filter-bar">
                 <label htmlFor="module-search" className="sr-only">
                   Filter modules
@@ -912,7 +912,7 @@ export default function App() {
             {filteredModules.length > 0 ? (
               <div className="module-grid" id="module-grid">
                 {filteredModules.map((mod, index) => (
-                  <article key={mod.name} className="module-card">
+                  <article key={mod.name} className="module-card" aria-labelledby={`module-heading-${mod.name}`}>
                     <button
                       type="button"
                       className="module-card-select"
@@ -920,11 +920,12 @@ export default function App() {
                       onClick={() => setSelectedModule(mod.name)}
                     >
                       <span aria-hidden="true">0{index + 1}</span>
-                      <h3>{mod.name}</h3>
+                      <h3 id={`module-heading-${mod.name}`}>{mod.name}</h3>
                       <p>{mod.description}</p>
                       <span className="module-category-tag">{mod.category}</span>
                     </button>
-                    <div className="module-card-links">
+                    <div className="module-card-links" role="group" aria-label={`Workflows for ${mod.name} module`}>
+                      <h4 className="sr-only">Available workflows</h4>
                       <a href="#commands" aria-label={`Open the command builder from the ${mod.name} module`}>
                         Command builder
                       </a>
@@ -943,11 +944,11 @@ export default function App() {
                 ))}
               </div>
             ) : (
-              <div className="module-empty-state" role="status" aria-live="polite">
+              <div className="module-empty-state" role="status" aria-live="polite" aria-labelledby="module-empty-heading">
                 <div className="module-empty-icon" aria-hidden="true">
                   ∅
                 </div>
-                <h3>{moduleFilter ? `No modules match “${moduleFilter}”` : "No modules match your filters"}</h3>
+                <h3 id="module-empty-heading">{moduleFilter ? `No modules match “${moduleFilter}”` : "No modules match your filters"}</h3>
                 <p>
                   {categoryFilter
                     ? `No testing modules in the ${categoryFilter} category match this search.`
@@ -1268,8 +1269,22 @@ export default function App() {
             </button>
           </div>
 
-          <section className="summary-card" aria-labelledby="command-summary-heading">
+          <section
+            className="summary-card"
+            aria-labelledby="command-summary-heading"
+            tabIndex={0}
+            role="region"
+            aria-label="Active command configuration summary"
+          >
             <h3 id="command-summary-heading">Command summary</h3>
+            <div
+              className="sr-only"
+              aria-live="polite"
+              aria-atomic="true"
+              data-testid="active-command-sr-summary"
+            >
+              Active {command} command settings: {summaryRows.map((row) => `${row.label} is ${row.value}`).join(", ")}.
+            </div>
             <p className="summary-workflow">{command}</p>
             <dl className="summary-settings">
               {summaryRows.map((row) => (
@@ -1495,7 +1510,14 @@ export default function App() {
             )}
           </section>
 
-          <div className="output">
+          <div className="output" role="region" aria-label="Generated CLI command">
+            <div
+              className="sr-only"
+              aria-live="polite"
+              data-testid="generated-command-sr-summary"
+            >
+              Active generated command: {generated}
+            </div>
             <code data-testid="command-output">{highlightCommand(generated)}</code>
             <button onClick={copy}>{copied ? "Copied" : "Copy"}</button>
             {/* #146 — download action for generated shell script */}
diff --git a/src/styles.css b/src/styles.css
index 430c51a..f3fda81 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -85,7 +85,20 @@
 * { box-sizing: border-box; }
 html { scroll-behavior: smooth; scroll-padding-top: 78px; }
 body { margin: 0; min-width: 320px; background: radial-gradient(circle at 75% 8%, var(--color-canvas-gradient) 0, transparent 28rem), var(--color-canvas); }
-a { color: inherit; text-decoration: none; }
+a {
+  color: inherit;
+  text-decoration: none;
+  transition: color .15s ease, text-decoration .15s ease, transform .15s ease;
+}
+a:hover {
+  text-decoration: underline;
+  text-underline-offset: 4px;
+}
+a:active {
+  text-decoration: underline;
+  text-underline-offset: 4px;
+  text-decoration-thickness: 2px;
+}
 button, input, select { font: inherit; }
 main { max-width: 1440px; margin: auto; overflow: hidden; }
 
@@ -129,8 +142,28 @@ nav {
   max-width: 200px;
   overflow: hidden;
   text-overflow: ellipsis;
+  text-decoration: none;
+}
+.nav-links a:hover {
+  color: var(--color-accent);
+  text-decoration: underline;
+  text-underline-offset: 6px;
+  text-decoration-thickness: 1.5px;
+}
+.nav-links a:active {
+  color: var(--color-accent);
+  text-decoration: underline;
+  text-underline-offset: 6px;
+  text-decoration-thickness: 2.5px;
+}
+.nav-links a[aria-current="location"],
+.nav-links a[aria-current="page"] {
+  color: var(--color-accent);
+  text-decoration: underline;
+  text-underline-offset: 6px;
+  text-decoration-thickness: 2px;
+  font-weight: 600;
 }
-.nav-links a:hover { color: var(--color-accent); }
 
 /* Hero Section */
 .hero { min-height: 680px; padding: var(--space-section) var(--page-padding) 80px; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 7vw; }
@@ -138,7 +171,24 @@ nav {
 h1 { margin: var(--space-xl) 0 var(--space-3xl); font-size: clamp(3.4rem, 6.5vw, 7rem); line-height: .96; letter-spacing: -.065em; }
 .lede { max-width: 650px; color: var(--color-text-secondary); font-size: 1.15rem; line-height: 1.75; }
 .actions { display: flex; gap: var(--space-md); margin-top: 38px; }
-.button { padding: 13px 19px; border-radius: var(--radius-base); font-weight: 600; font-size: .9rem; cursor: pointer; }
+.button {
+  padding: 13px 19px;
+  border-radius: var(--radius-base);
+  font-weight: 600;
+  font-size: .9rem;
+  cursor: pointer;
+  transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease;
+}
+.button:hover, a.button:hover {
+  text-decoration: none;
+  transform: translateY(-1px);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
+}
+.button:active, a.button:active {
+  text-decoration: none;
+  transform: translateY(0);
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
+}
 .primary { color: var(--color-accent-text-dark); background: var(--color-accent); border: 0; }
 .secondary { border: 1px solid var(--color-border-strong); background: transparent; color: var(--color-text-primary); }
 
@@ -198,7 +248,23 @@ h2 { margin: var(--space-md) 0; font-size: clamp(2rem, 4vw, 4rem); letter-spacin
 .module-card-select:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 4px; }
 .module-card-links, .category-filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-md); }
 .module-card-links { margin-top: var(--space-xl); }
-.module-card-links a { color: var(--color-accent); font-size: .75rem; }
+.module-card-links a {
+  display: inline-flex;
+  align-items: center;
+  font: 500 .75rem var(--font-mono);
+  color: var(--color-accent);
+  padding: 2px 0;
+  text-decoration: none;
+}
+.module-card-links a:hover {
+  text-decoration: underline;
+  text-underline-offset: 3px;
+}
+.module-card-links a:active {
+  text-decoration: underline;
+  text-underline-offset: 3px;
+  text-decoration-thickness: 2px;
+}
 .category-filter-bar { margin: var(--space-xl) 0; }
 .category-chip { padding: var(--space-xs) var(--space-md); border: 1px solid var(--color-border-default); border-radius: var(--radius-round); color: var(--color-text-secondary); background: transparent; cursor: pointer; }
 .category-chip.active { border-color: var(--color-accent); color: var(--color-accent); background: var(--color-accent-subtle); }
@@ -267,6 +333,54 @@ h2 { margin: var(--space-md) 0; font-size: clamp(2rem, 4vw, 4rem); letter-spacin
 .description { min-height: 48px; }
 .builder { padding: var(--space-5xl); background: var(--color-canvas); border: 1px solid var(--color-border-default); border-radius: var(--radius-lg); }
 
+/* Command Summary Card */
+.summary-card {
+  margin-top: var(--space-3xl);
+  padding: var(--space-xl);
+  background: var(--color-surface-card);
+  border: 1px solid var(--color-border-default);
+  border-radius: var(--radius-lg);
+}
+.summary-card:focus-visible {
+  outline: 2px solid var(--color-accent);
+  outline-offset: 2px;
+}
+.summary-workflow {
+  font: 700 1rem var(--font-mono);
+  color: var(--color-accent);
+  margin: var(--space-xs) 0 var(--space-md);
+  text-transform: uppercase;
+  letter-spacing: .06em;
+}
+.summary-settings {
+  display: grid;
+  gap: var(--space-xs);
+  margin: 0 0 var(--space-md);
+  padding: 0;
+}
+.summary-row {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  font-size: .82rem;
+  padding: 4px 0;
+  border-bottom: 1px solid var(--color-border-subtle);
+}
+.summary-row dt {
+  color: var(--color-text-secondary);
+}
+.summary-row dd {
+  margin: 0;
+  font-family: var(--font-mono);
+  color: var(--color-text-primary);
+}
+.summary-note {
+  margin: 0;
+  font-size: .75rem;
+  color: var(--color-text-muted);
+  line-height: 1.5;
+}
+
 /* Field & Required/Optional distinction */
 label { display: grid; gap: 9px; margin-bottom: var(--space-2xl); color: var(--color-text-label); font-size: .78rem; }
 .field-header {
@@ -448,6 +562,136 @@ footer { display: flex; justify-content: space-between; padding: 34px var(--page
   }
 }
 
+/* High-contrast and forced-colors mode support without losing control boundaries (#107) */
+@media (forced-colors: active) {
+  /* Control boundaries for interactive buttons */
+  .button,
+  button,
+  .primary,
+  .secondary {
+    border: 2px solid ButtonBorder !important;
+    outline: 1px solid transparent;
+  }
+
+  .primary {
+    background: Highlight !important;
+    color: HighlightText !important;
+    border-color: Highlight !important;
+  }
+
+  .button:hover,
+  button:hover {
+    border-color: Highlight !important;
+  }
+
+  .button:focus-visible,
+  button:focus-visible {
+    outline: 3px solid Highlight !important;
+    outline-offset: 2px !important;
+  }
+
+  /* Form inputs and controls preserve explicit field borders */
+  input,
+  select,
+  textarea,
+  .module-filter-input {
+    border: 2px solid FieldBorder !important;
+    color: FieldText !important;
+    background: Field !important;
+  }
+
+  input:focus,
+  select:focus,
+  textarea:focus,
+  .module-filter-input:focus {
+    border-color: Highlight !important;
+    outline: 2px solid Highlight !important;
+    outline-offset: 1px !important;
+  }
+
+  /* Cards, articles, and regions maintain distinct visible borders */
+  .module-grid article,
+  .summary-card,
+  .builder,
+  .terminal,
+  .guide-card,
+  .install-guide,
+  .install-step,
+  .comparison {
+    border: 1px solid CanvasText !important;
+  }
+
+  /* Command tabs / workflow buttons */
+  .command-tabs button {
+    border: 1px solid ButtonBorder !important;
+  }
+
+  .command-tabs button.active,
+  .command-tabs button[aria-pressed="true"] {
+    border: 2px solid Highlight !important;
+    background: Highlight !important;
+    color: HighlightText !important;
+  }
+
+  /* Badges */
+  .badge,
+  .badge-required,
+  .badge-optional {
+    border: 1px solid CanvasText !important;
+  }
+
+  /* Checkboxes */
+  .check input[type="checkbox"] {
+    outline: 1px solid CanvasText !important;
+  }
+
+  /* Links */
+  a:hover,
+  a:active {
+    text-decoration: underline !important;
+    text-decoration-color: Highlight !important;
+  }
+
+  .nav-links a[aria-current="location"],
+  .nav-links a[aria-current="page"] {
+    border-bottom: 2px solid Highlight !important;
+  }
+}
+
+@media (prefers-contrast: more) {
+  :root {
+    --color-border-subtle: #ffffff33;
+    --color-border-default: #ffffff44;
+    --color-border-strong: #ffffff66;
+    --color-border-input: #ffffff55;
+    --color-border-tab: #ffffff55;
+    --color-text-secondary: #c2d6ce;
+    --color-text-muted: #8ea39b;
+  }
+
+  .button,
+  button {
+    border-width: 2px;
+  }
+
+  input,
+  select,
+  textarea {
+    border-width: 2px;
+  }
+
+  .module-grid article {
+    border-width: 1px;
+    border-color: var(--color-border-strong);
+  }
+
+  a:hover,
+  a:active {
+    text-decoration: underline;
+    text-decoration-thickness: 2px;
+  }
+}
+
 /* #117 — mobile nav toggle */
 .mobile-menu-toggle {
   display: none;