diff --git a/code/websites/pokedex.online/src/components/shared/BaseModal.vue b/code/websites/pokedex.online/src/components/shared/BaseModal.vue
new file mode 100644
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+++ b/code/websites/pokedex.online/src/components/shared/BaseModal.vue
@@ -0,0 +1,358 @@
+<template>
+  <Teleport to="body">
+    <Transition name="modal">
+      <div
+        v-if="modelValue"
+        class="modal-overlay"
+        :class="{ 'modal-overlay--persistent': persistent }"
+        @click="handleOverlayClick"
+      >
+        <div
+          ref="modalRef"
+          class="modal-container"
+          :class="`modal-container--${size}`"
+          role="dialog"
+          aria-modal="true"
+          :aria-labelledby="title ? 'modal-title' : undefined"
+          @click.stop
+        >
+          <!-- Header -->
+          <div v-if="title || $slots.header || showClose" class="modal-header">
+            <slot name="header">
+              <h2 v-if="title" id="modal-title" class="modal-title">
+                {{ title }}
+              </h2>
+            </slot>
+            <button
+              v-if="showClose"
+              type="button"
+              class="modal-close"
+              aria-label="Close modal"
+              @click="handleClose"
+            >
+              ×
+            </button>
+          </div>
+
+          <!-- Body -->
+          <div class="modal-body">
+            <slot></slot>
+          </div>
+
+          <!-- Footer -->
+          <div v-if="$slots.footer" class="modal-footer">
+            <slot name="footer"></slot>
+          </div>
+        </div>
+      </div>
+    </Transition>
+  </Teleport>
+</template>
+
+<script setup>
+import { ref, watch, onMounted, onBeforeUnmount, nextTick } from 'vue';
+
+const props = defineProps({
+  /**
+   * Whether the modal is visible
+   */
+  modelValue: {
+    type: Boolean,
+    required: true
+  },
+  
+  /**
+   * Modal title (alternative to header slot)
+   */
+  title: {
+    type: String,
+    default: null
+  },
+  
+  /**
+   * Modal size
+   * @type {'small' | 'medium' | 'large' | 'full'}
+   */
+  size: {
+    type: String,
+    default: 'medium',
+    validator: (value) => ['small', 'medium', 'large', 'full'].includes(value)
+  },
+  
+  /**
+   * Whether clicking overlay closes the modal
+   */
+  closeOnOverlay: {
+    type: Boolean,
+    default: true
+  },
+  
+  /**
+   * Whether modal can be closed (hides X button, prevents ESC/overlay close)
+   */
+  persistent: {
+    type: Boolean,
+    default: false
+  },
+  
+  /**
+   * Whether to show the close X button
+   */
+  showClose: {
+    type: Boolean,
+    default: true
+  }
+});
+
+const emit = defineEmits(['update:modelValue', 'close', 'open']);
+
+const modalRef = ref(null);
+const previousActiveElement = ref(null);
+
+// Close handlers
+const handleClose = () => {
+  if (!props.persistent) {
+    emit('update:modelValue', false);
+    emit('close');
+  }
+};
+
+const handleOverlayClick = () => {
+  if (props.closeOnOverlay && !props.persistent) {
+    handleClose();
+  }
+};
+
+const handleEscapeKey = (event) => {
+  if (event.key === 'Escape' && props.modelValue && !props.persistent) {
+    handleClose();
+  }
+};
+
+// Focus management
+const getFocusableElements = () => {
+  if (!modalRef.value) return [];
+  
+  const focusableSelectors = [
+    'a[href]',
+    'area[href]',
+    'input:not([disabled]):not([type="hidden"])',
+    'select:not([disabled])',
+    'textarea:not([disabled])',
+    'button:not([disabled])',
+    '[tabindex]:not([tabindex="-1"])',
+    '[contenteditable="true"]'
+  ];
+  
+  return Array.from(
+    modalRef.value.querySelectorAll(focusableSelectors.join(','))
+  );
+};
+
+const handleTabKey = (event) => {
+  if (!props.modelValue) return;
+  
+  const focusableElements = getFocusableElements();
+  if (focusableElements.length === 0) return;
+  
+  const firstElement = focusableElements[0];
+  const lastElement = focusableElements[focusableElements.length - 1];
+  
+  if (event.shiftKey) {
+    // Shift + Tab: move focus backwards
+    if (document.activeElement === firstElement) {
+      event.preventDefault();
+      lastElement.focus();
+    }
+  } else {
+    // Tab: move focus forwards
+    if (document.activeElement === lastElement) {
+      event.preventDefault();
+      firstElement.focus();
+    }
+  }
+};
+
+const handleKeyDown = (event) => {
+  if (event.key === 'Escape') {
+    handleEscapeKey(event);
+  } else if (event.key === 'Tab') {
+    handleTabKey(event);
+  }
+};
+
+// Lifecycle hooks
+watch(() => props.modelValue, async (newValue) => {
+  if (newValue) {
+    // Modal opened
+    previousActiveElement.value = document.activeElement;
+    document.body.style.overflow = 'hidden';
+    emit('open');
+    
+    // Focus first focusable element after render
+    await nextTick();
+    const focusableElements = getFocusableElements();
+    if (focusableElements.length > 0) {
+      focusableElements[0].focus();
+    } else if (modalRef.value) {
+      modalRef.value.focus();
+    }
+  } else {
+    // Modal closed
+    document.body.style.overflow = '';
+    
+    // Restore focus to previous element
+    if (previousActiveElement.value) {
+      previousActiveElement.value.focus();
+      previousActiveElement.value = null;
+    }
+  }
+});
+
+onMounted(() => {
+  document.addEventListener('keydown', handleKeyDown);
+});
+
+onBeforeUnmount(() => {
+  document.removeEventListener('keydown', handleKeyDown);
+  document.body.style.overflow = '';
+});
+</script>
+
+<style scoped>
+/* Overlay */
+.modal-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background-color: rgba(0, 0, 0, 0.5);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 1rem;
+  z-index: 1000;
+  overflow-y: auto;
+}
+
+.modal-overlay--persistent {
+  cursor: not-allowed;
+}
+
+/* Container */
+.modal-container {
+  background: white;
+  border-radius: 0.5rem;
+  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
+  max-height: 90vh;
+  display: flex;
+  flex-direction: column;
+  position: relative;
+  cursor: auto;
+}
+
+.modal-container--small {
+  max-width: 400px;
+  width: 100%;
+}
+
+.modal-container--medium {
+  max-width: 600px;
+  width: 100%;
+}
+
+.modal-container--large {
+  max-width: 900px;
+  width: 100%;
+}
+
+.modal-container--full {
+  max-width: 95vw;
+  width: 100%;
+  height: 90vh;
+}
+
+/* Header */
+.modal-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 1.25rem 1.5rem;
+  border-bottom: 1px solid #e5e7eb;
+  flex-shrink: 0;
+}
+
+.modal-title {
+  margin: 0;
+  font-size: 1.25rem;
+  font-weight: 600;
+  color: #1f2937;
+}
+
+.modal-close {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 2rem;
+  height: 2rem;
+  padding: 0;
+  margin-left: 1rem;
+  background: transparent;
+  border: none;
+  border-radius: 0.25rem;
+  font-size: 1.5rem;
+  line-height: 1;
+  color: #6b7280;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.modal-close:hover {
+  background-color: #f3f4f6;
+  color: #1f2937;
+}
+
+.modal-close:focus-visible {
+  outline: 2px solid #3b82f6;
+  outline-offset: 2px;
+}
+
+/* Body */
+.modal-body {
+  padding: 1.5rem;
+  overflow-y: auto;
+  flex: 1 1 auto;
+}
+
+/* Footer */
+.modal-footer {
+  padding: 1.25rem 1.5rem;
+  border-top: 1px solid #e5e7eb;
+  display: flex;
+  gap: 0.75rem;
+  justify-content: flex-end;
+  flex-shrink: 0;
+}
+
+/* Transitions */
+.modal-enter-active,
+.modal-leave-active {
+  transition: opacity 0.3s ease;
+}
+
+.modal-enter-active .modal-container,
+.modal-leave-active .modal-container {
+  transition: transform 0.3s ease;
+}
+
+.modal-enter-from,
+.modal-leave-to {
+  opacity: 0;
+}
+
+.modal-enter-from .modal-container,
+.modal-leave-to .modal-container {
+  transform: scale(0.95);
+}
+</style>