Wall of Fire burns like it means it

The pulsing red rectangle becomes a standing fire: a glowing gradient
bar seated on the wall line, five tongues of flame licking on staggered
beats, and embers drifting off the top. Pure CSS on a handful of shapes
- no turbulence filters, which stay budgeted for the one-shot Fireball,
since firewalls burn indefinitely. Vertical walls flame just as well as
horizontal ones; reduced motion stills the fire but keeps it visible.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0138A8CjeQRpvzKxuMfz1Bqc

packages/web/src/Board.svelte

@@ -5,6 +5,7 @@
   import type { BoardFx } from "./fx";
   import { colorIndexOf as sharedColorIndex, wizardColor } from "./colors";
   import { CREATURE_ART, objectArt, TERRAIN_ART, tokenArt } from "./art";
+  import FirewallEdge from "./FirewallEdge.svelte";
   import TokenArt from "./TokenArt.svelte";
   import { FX_SPRITES } from "./fx-sprites";
 
@@ -382,23 +383,27 @@
 
   <!-- walls & doors & firewalls -->
   {#each edges as e (`${e.kind}:${e.x},${e.y}`)}
-    {@const cls = e.state === "door" ? `door${e.lock ? ` ${e.lock}` : ""}` : e.state === "firewall" ? "firewall" : "wall"}
+    {#if e.state === "firewall"}
-    {@const lockTitle = e.lock === "removed" ? "lock removed — swings free"
+      <FirewallEdge x={e.x} y={e.y} kind={e.kind === "V" ? "V" : "H"} />
-      : e.lock === "jammed" ? "lock jammed — sealed for good"
-      : e.lock === "held" ? "held open by a standing wizard"
-      : e.lock === "ajar" ? "unlocked until end of turn" : null}
-    {#if e.kind === "V"}
-      <rect
-        x={(e.x + 1) * CELL - WALL / 2} y={e.y * CELL - WALL / 2}
-        width={WALL} height={CELL + WALL}
-        class={cls}
-      >{#if lockTitle}<title>{lockTitle}</title>{/if}</rect>
     {:else}
-      <rect
+      {@const cls = e.state === "door" ? `door${e.lock ? ` ${e.lock}` : ""}` : "wall"}
-        x={e.x * CELL - WALL / 2} y={(e.y + 1) * CELL - WALL / 2}
+      {@const lockTitle = e.lock === "removed" ? "lock removed — swings free"
-        width={CELL + WALL} height={WALL}
+        : e.lock === "jammed" ? "lock jammed — sealed for good"
-        class={cls}
+        : e.lock === "held" ? "held open by a standing wizard"
-      >{#if lockTitle}<title>{lockTitle}</title>{/if}</rect>
+        : e.lock === "ajar" ? "unlocked until end of turn" : null}
+      {#if e.kind === "V"}
+        <rect
+          x={(e.x + 1) * CELL - WALL / 2} y={e.y * CELL - WALL / 2}
+          width={WALL} height={CELL + WALL}
+          class={cls}
+        >{#if lockTitle}<title>{lockTitle}</title>{/if}</rect>
+      {:else}
+        <rect
+          x={e.x * CELL - WALL / 2} y={(e.y + 1) * CELL - WALL / 2}
+          width={CELL + WALL} height={WALL}
+          class={cls}
+        >{#if lockTitle}<title>{lockTitle}</title>{/if}</rect>
+      {/if}
     {/if}
   {/each}
 
@@ -707,16 +712,6 @@
   .door.ajar { fill: #d4bd8e; stroke-dasharray: 5 3; }
   /* Held open: a wizard stands propping it. */
   .door.held { fill: #d4bd8e; stroke: #2e7d32; }
-  .firewall {
-    fill: #d0342c;
-    stroke: #7c1a14;
-    stroke-width: 1.2;
-    animation: firewall-lick 1.1s ease-in-out infinite alternate;
-  }
-  @keyframes firewall-lick {
-    from { fill: #d0342c; filter: drop-shadow(0 0 2px rgba(255, 120, 20, 0.5)); }
-    to { fill: #ef6c3a; filter: drop-shadow(0 0 6px rgba(255, 140, 30, 0.9)); }
-  }
   .stone { fill: #6a6458; stroke: #3a362e; stroke-width: 2; }
   .bush { fill: #2e7d32; stroke: #1b4d1e; stroke-width: 2; }
   .rose { fill: #2e7d32; stroke: #b0245a; stroke-width: 3; }
@@ -874,7 +869,7 @@
     .marked-cell, .marked-sector, .ghost-slot, .warp-dest { animation: none; }
     .sight-line, .sight-mouth { animation: none; }
     .fx-layer { display: none; }
-    .firewall, :global(.token-art.ghosted) { animation: none; }
+    :global(.token-art.ghosted) { animation: none; }
     .mover { transition: none; }
   }
   .wizard { cursor: pointer; }

packages/web/src/FirewallEdge.svelte

@@ -0,0 +1,100 @@
+<script lang="ts">
+  // A standing WALL OF FIRE: board furniture, not a flourish — it burns for
+  // as long as the spell holds, so the animation is pure CSS on a handful
+  // of shapes (no turbulence filters; those are budgeted for one-shot fx).
+  let { x, y, kind }: { x: number; y: number; kind: "V" | "H" } = $props();
+  const uid = $props.id();
+  const CELL = 48;
+  const WALL = 7;
+  const cx = $derived(kind === "V" ? (x + 1) * CELL : x * CELL + CELL / 2);
+  const cy = $derived(kind === "V" ? y * CELL + CELL / 2 : (y + 1) * CELL);
+  // Tongues sit along the edge's axis; every flame rises screen-up.
+  const TONGUES = [
+    { t: -0.38, h: 11, d: 0.0 },
+    { t: -0.19, h: 15, d: 0.45 },
+    { t: 0.0, h: 18, d: 0.15 },
+    { t: 0.21, h: 13, d: 0.6 },
+    { t: 0.4, h: 16, d: 0.3 },
+  ];
+  const EMBERS = [
+    { t: -0.28, d: 0.0 },
+    { t: 0.08, d: 0.9 },
+    { t: 0.33, d: 1.7 },
+  ];
+  const px = (t: number) => (kind === "V" ? 0 : t * CELL);
+  const py = (t: number) => (kind === "V" ? t * CELL : 0);
+</script>
+
+<g transform={`translate(${cx} ${cy})`} class="fw" aria-hidden="true">
+  <defs>
+    <linearGradient id={`fw-bar-${uid}`} x1="0" y1="1" x2="0" y2="0">
+      <stop offset="0" stop-color="#7c1a14" />
+      <stop offset="0.5" stop-color="#ef3b08" />
+      <stop offset="1" stop-color="#ffad22" />
+    </linearGradient>
+    <linearGradient id={`fw-tongue-${uid}`} x1="0" y1="1" x2="0" y2="0">
+      <stop offset="0" stop-color="#ef3b08" />
+      <stop offset="0.55" stop-color="#ff9d16" />
+      <stop offset="1" stop-color="#fff09a" />
+    </linearGradient>
+  </defs>
+  <!-- the burning bar itself, seated on the wall line -->
+  {#if kind === "V"}
+    <rect x={-WALL / 2} y={-CELL / 2 - 2} width={WALL} height={CELL + 4} rx="3"
+      fill={`url(#fw-bar-${uid})`} class="fw-bar" />
+  {:else}
+    <rect x={-CELL / 2 - 2} y={-WALL / 2} width={CELL + 4} height={WALL} rx="3"
+      fill={`url(#fw-bar-${uid})`} class="fw-bar" />
+  {/if}
+  <!-- tongues of flame, each licking on its own beat -->
+  {#each TONGUES as f (f.t)}
+    <path
+      d={`M ${px(f.t) - 3.4} ${py(f.t) + 1}
+          C ${px(f.t) - 3.6} ${py(f.t) - f.h * 0.45}, ${px(f.t) - 1.4} ${py(f.t) - f.h * 0.7}, ${px(f.t)} ${py(f.t) - f.h}
+          C ${px(f.t) + 1.4} ${py(f.t) - f.h * 0.7}, ${px(f.t) + 3.6} ${py(f.t) - f.h * 0.45}, ${px(f.t) + 3.4} ${py(f.t) + 1} Z`}
+      fill={`url(#fw-tongue-${uid})`}
+      class="fw-tongue"
+      style={`transform-origin: ${px(f.t)}px ${py(f.t) + 1}px; animation-delay: ${f.d}s`}
+    />
+  {/each}
+  <!-- embers drifting off the top -->
+  {#each EMBERS as em (em.t)}
+    <circle cx={px(em.t)} cy={py(em.t) - 6} r="1.4" class="fw-ember"
+      style={`animation-delay: ${em.d}s`} />
+  {/each}
+</g>
+
+<style>
+  .fw { pointer-events: none; }
+  .fw-bar {
+    stroke: #7c1a14;
+    stroke-width: 1;
+    filter: drop-shadow(0 0 3px rgba(255, 140, 30, 0.7));
+    animation: fw-glow 1.3s ease-in-out infinite alternate;
+  }
+  .fw-tongue {
+    animation: fw-lick 0.9s ease-in-out infinite alternate;
+  }
+  .fw-ember {
+    fill: #ffd166;
+    opacity: 0;
+    animation: fw-rise 2.6s ease-out infinite;
+  }
+  @keyframes fw-glow {
+    from { filter: drop-shadow(0 0 2px rgba(255, 120, 20, 0.5)); }
+    to { filter: drop-shadow(0 0 6px rgba(255, 150, 40, 0.95)); }
+  }
+  @keyframes fw-lick {
+    from { transform: scale(0.95, 0.72); opacity: 0.82; }
+    to { transform: scale(1.04, 1.12); opacity: 1; }
+  }
+  @keyframes fw-rise {
+    0% { opacity: 0; transform: translateY(0); }
+    15% { opacity: 0.9; }
+    100% { opacity: 0; transform: translateY(-16px); }
+  }
+  @media (prefers-reduced-motion: reduce) {
+    .fw-bar, .fw-tongue, .fw-ember { animation: none; }
+    .fw-ember { opacity: 0.6; }
+  }
+</style>