feat(tip): add selectable coffee gift tiers

src/app/tip/tip-screen.module.css

@@ -236,6 +236,156 @@
   letter-spacing: -0.04em;
 }
 
+.tierSelector {
+  grid-column: 1 / -1;
+  min-width: 0;
+  margin: 2px 0 0;
+  padding: 0;
+  border: 0;
+}
+
+.tierLegend {
+  width: 100%;
+  margin-bottom: 12px;
+  color: #6f5055;
+  font-size: clamp(13px, 3.148vw, 15px);
+  font-weight: 850;
+  letter-spacing: 0.025em;
+}
+
+.tierList {
+  display: grid;
+  gap: 10px;
+}
+
+.tierOption {
+  position: relative;
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto 28px;
+  align-items: center;
+  gap: 12px;
+  min-height: 72px;
+  padding: 12px 14px 12px 16px;
+  border: 1px solid rgba(112, 71, 65, 0.12);
+  border-radius: 20px;
+  background: rgba(255, 255, 255, 0.68);
+  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
+  cursor: pointer;
+  transition:
+    border-color 0.18s ease,
+    background 0.18s ease,
+    box-shadow 0.18s ease,
+    transform 0.18s ease;
+}
+
+.tierOption[data-selected="true"] {
+  border-color: var(--color-accent, #f84d96);
+  background:
+    linear-gradient(105deg, rgba(255, 255, 255, 0.94), rgba(255, 235, 243, 0.9)),
+    #ffffff;
+  box-shadow:
+    0 12px 28px rgba(248, 77, 150, 0.16),
+    inset 3px 0 0 var(--color-accent, #f84d96);
+}
+
+.tierOption[data-unavailable="true"],
+.tierSelector:disabled .tierOption {
+  cursor: not-allowed;
+}
+
+.tierOption[data-unavailable="true"] {
+  filter: grayscale(0.25);
+  opacity: 0.56;
+}
+
+.tierSelector:disabled .tierOption {
+  opacity: 0.72;
+}
+
+.tierInput {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
+.tierOption:has(.tierInput:focus-visible) {
+  outline: 3px solid rgba(248, 77, 150, 0.28);
+  outline-offset: 3px;
+}
+
+.tierDetails,
+.tierPriceBlock {
+  display: flex;
+  min-width: 0;
+  flex-direction: column;
+}
+
+.tierDetails {
+  gap: 4px;
+}
+
+.tierLabel {
+  color: #a36d73;
+  font-size: 10px;
+  font-weight: 900;
+  letter-spacing: 0.13em;
+  text-transform: uppercase;
+}
+
+.tierName {
+  overflow: hidden;
+  color: #2a1b1e;
+  font-family: var(--font-athelas), Georgia, serif;
+  font-size: clamp(17px, 4.259vw, 21px);
+  font-weight: 750;
+  letter-spacing: -0.02em;
+  line-height: 1.05;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.tierPriceBlock {
+  align-items: flex-end;
+  gap: 3px;
+  text-align: right;
+}
+
+.tierPrice {
+  color: #d23f79;
+  font-size: clamp(14px, 3.519vw, 17px);
+  font-weight: 950;
+  white-space: nowrap;
+}
+
+.tierUnavailable {
+  color: #8f7376;
+  font-size: 10px;
+  font-weight: 800;
+}
+
+.tierCheck {
+  display: grid;
+  width: 25px;
+  height: 25px;
+  place-items: center;
+  border: 1px solid rgba(111, 76, 73, 0.2);
+  border-radius: 999px;
+  color: transparent;
+}
+
+.tierOption[data-selected="true"] .tierCheck {
+  border-color: var(--color-accent, #f84d96);
+  background: var(--color-accent, #f84d96);
+  color: #ffffff;
+  box-shadow: 0 5px 14px rgba(248, 77, 150, 0.26);
+}
+
 .successCard {
   display: flex;
   align-items: center;
@@ -352,6 +502,10 @@
     width: min(100%, 220px);
     justify-self: center;
   }
+
+  .tierName {
+    white-space: normal;
+  }
 }
 
 @media (hover: hover) {
@@ -359,6 +513,12 @@
   .checkoutButton:not(:disabled):hover {
     transform: translateY(-1px);
   }
+
+  .tierSelector:not(:disabled)
+    .tierOption:not([data-unavailable="true"]):hover {
+    border-color: rgba(248, 77, 150, 0.42);
+    transform: translateY(-1px);
+  }
 }
 
 @keyframes floatIn {