Make the game table usable on phones

The game page was wider than the viewport on mobile (528px at 390px).

- HUD: wrap its items instead of one non-wrapping row, which clipped the
  left items and pushed the page wider than the screen.
- Table grid: use minmax(0, ...) tracks and allow the seat panels and
  centre to shrink; wrap the seat name and move banner; under 576px trim
  paddings/gaps, shrink the cards and let the hidden-hand backs wrap.
- Deal summary and pickers: cap their width at the viewport so the
  420px/320px minimums no longer overflow narrow screens.
- Stock pile: the card backs overlapped so much they collapsed into a
  single card; reduce the negative margin so the stack reads as a stack.

web/style.css

@@ -37,7 +37,8 @@ body {
 
 .hud {
     display: flex;
-    gap: 1.5rem;
+    flex-wrap: wrap;
+    gap: 0.4rem 1.5rem;
     align-items: center;
     justify-content: center;
     padding: 0.6rem 1rem;
@@ -76,7 +77,10 @@ body {
 .table-grid {
     flex: 1;
     display: grid;
-    grid-template-columns: 1fr 2.4fr 1fr;
+    /* minmax(0, …) lets the tracks shrink below their content's
+     * min-content width; without it the center's move banner and the
+     * seat panels push the grid wider than the screen on phones. */
+    grid-template-columns: minmax(0, 1fr) minmax(0, 2.4fr) minmax(0, 1fr);
     grid-template-rows: auto 1fr auto;
     grid-template-areas:
         ". top ."
@@ -114,6 +118,7 @@ body {
     flex-direction: column;
     justify-content: flex-start;
     min-height: 116px;
+    min-width: 0;
     align-self: center;
     width: 100%;
 }
@@ -126,7 +131,8 @@ body {
 .seat-name {
     font-weight: 600;
     display: flex;
-    gap: 0.5rem;
+    flex-wrap: wrap;
+    gap: 0.15rem 0.5rem;
     align-items: center;
     justify-content: center;
 }
@@ -167,6 +173,7 @@ body {
     justify-content: center;
     gap: 0.75rem;
     min-height: 230px;
+    min-width: 0;
 }
 
 .table-cards {
@@ -240,8 +247,11 @@ body {
 
 .move-banner {
     display: flex;
+    flex-wrap: wrap;
     align-items: center;
+    justify-content: center;
     gap: 0.4rem;
+    max-width: 100%;
     background: rgba(0, 0, 0, 0.35);
     border-radius: 999px;
     padding: 0.35rem 1rem;
@@ -292,7 +302,8 @@ body {
     border-radius: 14px;
     padding: 1.5rem 2rem;
     text-align: center;
-    min-width: 320px;
+    min-width: min(320px, calc(100vw - 1.5rem));
+    max-width: calc(100vw - 1.5rem);
 }
 
 .capture-options {
@@ -327,8 +338,8 @@ body {
 /* ---------- hand-end scoring summary ---------- */
 
 .summary-panel {
-    min-width: 420px;
+    min-width: min(420px, calc(100vw - 1.5rem));
-    max-width: 560px;
+    max-width: min(560px, calc(100vw - 1.5rem));
     text-align: left;
 }
 
@@ -499,7 +510,7 @@ body {
 
 .playing-card.stock-card {
     height: 48px;
-    margin-left: -34px;
+    margin-left: -18px;
 }
 
 .playing-card.stock-card:first-child {
@@ -540,3 +551,119 @@ body {
         "center"
         "bottom";
 }
+
+/* ---------- phones ---------- */
+
+@media (max-width: 576px) {
+    .hud {
+        gap: 0.3rem 0.75rem;
+        padding: 0.45rem 0.5rem;
+        font-size: 0.85rem;
+    }
+
+    .table-grid {
+        gap: 0.35rem;
+        padding: 0.4rem;
+    }
+
+    .seat {
+        min-height: 92px;
+        padding: 0.35rem 0.4rem;
+    }
+
+    .seat-name {
+        font-size: 0.85rem;
+    }
+
+    .team-badge {
+        font-size: 0.6rem;
+    }
+
+    .seat-stats {
+        font-size: 0.7rem;
+    }
+
+    /* Flex-wrap lets the hidden-hand backs drop to the next row instead
+     * of forcing the seat wider than its track. */
+    .seat-cards {
+        display: flex;
+        flex-wrap: wrap;
+        gap: 2px;
+        justify-content: center;
+        margin: 0.2rem 0;
+    }
+
+    .center {
+        min-height: 180px;
+        gap: 0.45rem;
+    }
+
+    .move-banner {
+        font-size: 0.8rem;
+        padding: 0.25rem 0.6rem;
+    }
+
+    .playing-card.mini {
+        height: 26px;
+    }
+
+    .playing-card.table-card {
+        height: 62px;
+    }
+
+    .playing-card.move-card {
+        height: 42px;
+    }
+
+    .playing-card.hand-card {
+        height: 92px;
+    }
+
+    .hand {
+        min-height: 100px;
+        gap: 0.35rem;
+    }
+
+    .stock {
+        gap: 0.4rem;
+    }
+
+    .playing-card.stock-card {
+        height: 38px;
+        margin-left: -12px;
+    }
+
+    .playing-card.briscola-card {
+        height: 50px;
+    }
+
+    .picker {
+        padding: 1rem 1.1rem;
+    }
+
+    .summary-panel h2 {
+        font-size: 1.25rem;
+    }
+
+    .score-row {
+        gap: 0.5rem;
+        padding: 0.35rem 0.5rem;
+    }
+
+    .score-text {
+        font-size: 0.85rem;
+    }
+
+    .score-icon {
+        width: 26px;
+    }
+
+    .playing-card.score-mini {
+        height: 30px;
+    }
+
+    .total-row {
+        grid-template-columns: 3.5rem 1fr 3.2rem;
+        gap: 0.4rem;
+    }
+}