diff --git a/src/pages/proyectos/[id].astro b/src/pages/proyectos/[id].astro
index b6bbb02..c166dab 100644
--- a/src/pages/proyectos/[id].astro
+++ b/src/pages/proyectos/[id].astro
@@ -206,4 +206,14 @@ const breadcrumbLd = {
 		</article>
 	</main>
 
+	<script>
+		import { initProyectoTabs } from '../../scripts/proyecto-tabs.js';
+
+		if (document.readyState === 'loading') {
+			document.addEventListener('DOMContentLoaded', initProyectoTabs, { once: true });
+		} else {
+			initProyectoTabs();
+		}
+	</script>
+
 </Layout>
diff --git a/src/scripts/proyecto-tabs.js b/src/scripts/proyecto-tabs.js
new file mode 100644
index 0000000..21d0a2e
--- /dev/null
+++ b/src/scripts/proyecto-tabs.js
@@ -0,0 +1,139 @@
+function slugify(value) {
+  return value
+    .normalize('NFD')
+    .replace(/[\u0300-\u036f]/g, '')
+    .toLowerCase()
+    .trim()
+    .replace(/[^a-z0-9]+/g, '-')
+    .replace(/^-+|-+$/g, '');
+}
+
+function ensureHeadingId(heading, usedIds) {
+  if (heading.id) {
+    usedIds.add(heading.id);
+    return heading.id;
+  }
+
+  const base = slugify(heading.textContent || '') || 'apartado';
+  let id = base;
+  let i = 2;
+  while (usedIds.has(id) || document.getElementById(id)) {
+    id = `${base}-${i++}`;
+  }
+
+  heading.id = id;
+  usedIds.add(id);
+  return id;
+}
+
+export function initProyectoTabs() {
+  const container = document.querySelector('.pd-contenido');
+  if (!container) return;
+
+  const topSections = Array.from(container.querySelectorAll(':scope > h2'));
+  if (topSections.length < 2) return;
+
+  const tabsRoot = document.createElement('section');
+  tabsRoot.className = 'pd-tabs';
+
+  const tabList = document.createElement('div');
+  tabList.className = 'pd-tabs-list';
+  tabList.setAttribute('role', 'tablist');
+  tabList.setAttribute('aria-label', 'Apartados del proyecto');
+
+  const panels = document.createElement('div');
+  panels.className = 'pd-tabs-panels';
+
+  const usedIds = new Set(Array.from(container.querySelectorAll('[id]'), (el) => el.id));
+  const tabs = [];
+  const panelByHeadingId = new Map();
+
+  topSections.forEach((heading, index) => {
+    const headingId = ensureHeadingId(heading, usedIds);
+    const tabId = `pd-tab-${headingId}`;
+    const panelId = `pd-panel-${headingId}`;
+
+    const tab = document.createElement('button');
+    tab.type = 'button';
+    tab.className = 'pd-tab-btn';
+    tab.id = tabId;
+    tab.setAttribute('role', 'tab');
+    tab.setAttribute('aria-controls', panelId);
+    tab.setAttribute('aria-selected', 'false');
+    tab.setAttribute('tabindex', '-1');
+    tab.textContent = heading.textContent?.trim() || `Apartado ${index + 1}`;
+
+    const panel = document.createElement('section');
+    panel.className = 'pd-tab-panel';
+    panel.id = panelId;
+    panel.setAttribute('role', 'tabpanel');
+    panel.setAttribute('aria-labelledby', tabId);
+    panel.hidden = true;
+
+    let current = heading;
+    while (current) {
+      const next = current.nextElementSibling;
+      if (current !== heading && current.tagName === 'H2') break;
+      panel.appendChild(current);
+      current = next;
+    }
+
+    panelByHeadingId.set(headingId, index);
+    tabs.push({ tab, panel, headingId });
+    tabList.appendChild(tab);
+    panels.appendChild(panel);
+  });
+
+  tabsRoot.appendChild(tabList);
+  tabsRoot.appendChild(panels);
+  container.prepend(tabsRoot);
+
+  const setActive = (index, { updateHash = false, focusTab = false } = {}) => {
+    tabs.forEach(({ tab, panel }, i) => {
+      const active = i === index;
+      tab.classList.toggle('is-active', active);
+      tab.setAttribute('aria-selected', active ? 'true' : 'false');
+      tab.setAttribute('tabindex', active ? '0' : '-1');
+      panel.hidden = !active;
+      panel.classList.toggle('is-active', active);
+    });
+
+    const activeTab = tabs[index];
+    if (!activeTab) return;
+
+    if (focusTab) activeTab.tab.focus();
+
+    if (updateHash && activeTab.headingId) {
+      history.replaceState(null, '', `#${activeTab.headingId}`);
+    }
+  };
+
+  tabs.forEach(({ tab }, index) => {
+    tab.addEventListener('click', () => setActive(index, { updateHash: true }));
+  });
+
+  tabList.addEventListener('keydown', (event) => {
+    const currentIndex = tabs.findIndex(({ tab }) => tab.getAttribute('aria-selected') === 'true');
+    if (currentIndex === -1) return;
+
+    let nextIndex = null;
+    if (event.key === 'ArrowRight') nextIndex = (currentIndex + 1) % tabs.length;
+    if (event.key === 'ArrowLeft') nextIndex = (currentIndex - 1 + tabs.length) % tabs.length;
+    if (event.key === 'Home') nextIndex = 0;
+    if (event.key === 'End') nextIndex = tabs.length - 1;
+    if (nextIndex === null) return;
+
+    event.preventDefault();
+    setActive(nextIndex, { updateHash: true, focusTab: true });
+  });
+
+  const initialHash = window.location.hash.replace('#', '');
+  const initialIndex = panelByHeadingId.get(initialHash) ?? 0;
+  setActive(initialIndex);
+
+  window.addEventListener('hashchange', () => {
+    const hash = window.location.hash.replace('#', '');
+    const index = panelByHeadingId.get(hash);
+    if (typeof index === 'number') setActive(index);
+  });
+}
diff --git a/src/styles/proyecto-detalle.css b/src/styles/proyecto-detalle.css
index b4fad82..43c91ef 100644
--- a/src/styles/proyecto-detalle.css
+++ b/src/styles/proyecto-detalle.css
@@ -377,6 +377,54 @@ body:has(.pd-page) {
   text-decoration-color: var(--pd-azul);
 }
 
+/* Pestañas para apartados de primer nivel del markdown */
+.pd-tabs {
+  margin: 0 0 28px;
+}
+
+.pd-tabs-list {
+  display: flex;
+  gap: 10px;
+  flex-wrap: wrap;
+  margin: 0 0 24px;
+}
+
+.pd-tab-btn {
+  appearance: none;
+  border: 1px solid rgba(147, 197, 253, 0.25);
+  background: rgba(147, 197, 253, 0.08);
+  color: rgba(212, 227, 255, 0.9);
+  border-radius: 999px;
+  padding: 10px 16px;
+  font: inherit;
+  font-size: 0.9rem;
+  font-weight: 600;
+  line-height: 1.2;
+  cursor: pointer;
+  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
+}
+
+.pd-tab-btn:hover {
+  background: rgba(147, 197, 253, 0.16);
+  border-color: rgba(147, 197, 253, 0.45);
+}
+
+.pd-tab-btn:focus-visible {
+  outline: 2px solid rgba(147, 197, 253, 0.9);
+  outline-offset: 2px;
+}
+
+.pd-tab-btn.is-active {
+  background: linear-gradient(135deg, rgba(147, 197, 253, 0.25), rgba(196, 181, 253, 0.2));
+  border-color: rgba(147, 197, 253, 0.6);
+  color: #fff;
+  transform: translateY(-1px);
+}
+
+.pd-tab-panel > h2:first-child {
+  margin-top: 0;
+}
+
 /* Secciones indentadas con línea de color por categoría */
 .pd-contenido .pd-seccion {
   --pd-linea: rgba(255, 255, 255, 0.15); /* genérico, sin categoría */
@@ -582,6 +630,15 @@ body:has(.pd-page) {
   .pd-back {
     padding: 10px;
   }
+
+  .pd-tabs-list {
+    gap: 8px;
+  }
+
+  .pd-tab-btn {
+    padding: 9px 14px;
+    font-size: 0.85rem;
+  }
 }
 
 @media (max-width: 480px) {