Add project files.

BudgetApp/wwwroot/app.css

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+html, body {
+    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
+}
+
+a, .btn-link {
+    color: #006bb7;
+}
+
+.btn-primary {
+    color: #fff;
+    background-color: #1b6ec2;
+    border-color: #1861ac;
+}
+
+.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
+  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
+}
+
+.content {
+    padding-top: 1.1rem;
+}
+
+h1:focus {
+    outline: none;
+}
+
+.valid.modified:not([type=checkbox]) {
+    outline: 1px solid #26b050;
+}
+
+.invalid {
+    outline: 1px solid #e50000;
+}
+
+.validation-message {
+    color: #e50000;
+}
+
+.blazor-error-boundary {
+    background: url(data:image/svg+xml;base64,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) no-repeat 1rem/1.8rem, #b32121;
+    padding: 1rem 1rem 1rem 3.7rem;
+    color: white;
+}
+
+    .blazor-error-boundary::after {
+        content: "An error has occurred."
+    }
+
+.darker-border-checkbox.form-check-input {
+    border-color: #929292;
+}
+
+.form-floating > .form-control-plaintext::placeholder, .form-floating > .form-control::placeholder {
+    color: var(--bs-secondary-color);
+    text-align: end;
+}
+
+.form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
+    text-align: start;
+}
+
+/* ── Transitions & Animations ── */
+
+@keyframes fadeInUp {
+    from { opacity: 0; transform: translateY(10px); }
+    to { opacity: 1; transform: translateY(0); }
+}
+
+@keyframes modalFadeIn {
+    from { opacity: 0; }
+    to { opacity: 1; }
+}
+
+@keyframes modalSlideDown {
+    from { opacity: 0; transform: translateY(-20px); }
+    to { opacity: 1; transform: translateY(0); }
+}
+
+/* Page content entrance */
+.content > * {
+    animation: fadeInUp 0.35s ease both;
+}
+
+/* Cards */
+.card {
+    transition: box-shadow 0.25s ease, transform 0.25s ease;
+}
+
+.card:hover {
+    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
+}
+
+/* Balance chips */
+.balance-chip {
+    transition: box-shadow 0.25s ease, transform 0.25s ease;
+}
+
+.balance-chip:hover {
+    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
+    transform: translateY(-2px);
+}
+
+/* List group items */
+.list-group-item {
+    transition: background-color 0.2s ease, border-left-color 0.2s ease, box-shadow 0.2s ease;
+}
+
+.list-group-item:hover {
+    background-color: rgba(0, 0, 0, 0.02);
+}
+
+/* Transaction rows */
+.txn-row {
+    padding: 0.75rem 1rem;
+}
+
+.txn-row-selected {
+    background-color: rgba(13, 110, 253, 0.06);
+}
+
+/* Modal */
+.modal.d-block {
+    animation: modalFadeIn 0.2s ease;
+}
+
+.modal.d-block .modal-content {
+    animation: modalSlideDown 0.3s ease;
+}
+
+/* Buttons */
+.btn {
+    transition: transform 0.15s ease, box-shadow 0.15s ease,
+                background-color 0.15s ease, border-color 0.15s ease,
+                color 0.15s ease;
+}
+
+.btn:active {
+    transform: scale(0.96);
+}
+
+/* Nav tabs */
+.nav-link {
+    transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
+}
+
+/* Badges */
+.badge {
+    transition: opacity 0.2s ease;
+}
+
+/* Alerts entrance */
+.alert {
+    animation: fadeInUp 0.35s ease both;
+}
+
+/* Chart canvas */
+canvas {
+    transition: opacity 0.3s ease;
+}