web: the muted text that was never muted, and the stylesheet fetched every time

Every text-[color:var(--ink)]/50, border-[color:var(--ink)]/10 and
bg-[color:var(--ink)]/5 in the templates compiled to nothing. Tailwind v3
cannot put an opacity on an arbitrary var() colour, so all 538 of them were
dropped from output.css without a word. Meta text rendered at full ink, card
borders fell back to Tailwind's default grey (bright white rings at night),
and the washes, backdrops and hover pills simply weren't there, on the news
site, the casino and the adventure pages alike.

The palette is now written once per phase and casino room as bare rgb
channels (--ink-rgb and friends), the plain vars are built from them, and
tailwind.config.js exposes ink, muted, accent, warn and card as real colours.
The classes are text-ink/80, border-ink/10, bg-accent/20 now, and they compile.

Restoring the intended opacities as-is would have traded flat for illegible:
ink at 50% measures 2.7 to 2.9:1 on the lit phases. So secondary text gets
its own colour, --muted, per phase and per casino room, taken as faint as it
can go while still clearing 4.5:1 on both the card and the page. Everything
that was ink at 35 to 70% is text-muted. The 20-30% ones are separators and
empty-cell dashes and stay faint.

The bg-theme-* chips carry white text everywhere they appear, and eight of
them measured 2.5 to 3.2:1. Same hues, taken just dark enough to pass (4.6 to
4.7:1). eu, lego and adventure already passed and are unchanged, and the
underline and border colours keep the old pastels since they carry no text.

Static files came out of the embedded FS with no Last-Modified, no ETag and
no Cache-Control, so every page view downloaded the stylesheet and every
script in full, and the service worker's "cheap 304" never happened. Each
file is hashed once now. Templates link through {{asset}}, which appends
?v=<hash>; a request naming the current hash is served immutable for a year,
and everything else gets the hash as its ETag and revalidates to a 304. The
service worker serves versioned URLs cache-first, drops older versions of the
same file as new ones land, and moves to cache v6.

internal/web/templates/trivia.html

@@ -5,7 +5,7 @@
 
   <div class="flex flex-wrap items-center justify-between gap-3">
     <div class="flex items-center gap-3 min-w-0">
-      <a href="/games" class="grid h-10 w-10 shrink-0 place-items-center rounded-full bg-[color:var(--card)] shadow-pete border-2 border-[color:var(--ink)]/10 hover:bg-[color:var(--ink)]/5 transition" title="Back to the casino">
+      <a href="/games" class="grid h-10 w-10 shrink-0 place-items-center rounded-full bg-card shadow-pete border-2 border-ink/10 hover:bg-ink/5 transition" title="Back to the casino">
         <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="h-5 w-5" aria-hidden="true">
           <path d="M19 12H5"></path><polyline points="12 19 5 12 12 5"></polyline>
         </svg>
@@ -13,14 +13,14 @@
       </a>
       <h1 class="font-display text-3xl font-bold">Trivia</h1>
     </div>
-    <p class="text-sm text-[color:var(--ink)]/50">{{.Rungs}} questions · answer fast, or don't bother</p>
+    <p class="text-sm text-muted">{{.Rungs}} questions · answer fast, or don't bother</p>
   </div>
 
   {{template "_chipbar" .}}
 
   <!-- The felt. The clock is the biggest thing on it, because the clock is the
        game: a right answer is worth what it's worth *when you give it*. -->
-  <section class="pete-felt relative overflow-hidden rounded-3xl p-6 sm:p-10 shadow-pete-lg border-2 border-[color:var(--ink)]/10">
+  <section class="pete-felt relative overflow-hidden rounded-3xl p-6 sm:p-10 shadow-pete-lg border-2 border-ink/10">
 
     <div class="pete-rack" data-house aria-hidden="true">
       <span data-chip="500" style="--stack: 5"></span>
@@ -76,34 +76,34 @@
   </section>
 
   <!-- Playing: shown while a ladder is live. -->
-  <section data-playing class="hidden rounded-3xl bg-[color:var(--card)] p-5 sm:p-6 shadow-pete border-2 border-[color:var(--ink)]/10">
+  <section data-playing class="hidden rounded-3xl bg-card p-5 sm:p-6 shadow-pete border-2 border-ink/10">
     <div class="flex flex-wrap items-center gap-3">
-      <p class="text-sm text-[color:var(--ink)]/50">
+      <p class="text-sm text-muted">
         Press <span class="font-bold">1</span>–<span class="font-bold">4</span>, or click one. A wrong answer, or the clock, loses the lot.
       </p>
       <button type="button" data-walk
-              class="ml-auto rounded-full bg-[color:var(--accent)] px-6 py-3 font-display text-lg font-bold text-white shadow-pete
+              class="ml-auto rounded-full bg-accent px-6 py-3 font-display text-lg font-bold text-white shadow-pete
                      hover:brightness-105 active:translate-y-px disabled:opacity-40 disabled:pointer-events-none transition">
         Take the money · <span data-walk-amount>0</span>
       </button>
     </div>
-    <p data-game-msg class="hidden mt-3 rounded-2xl bg-[color:var(--ink)]/5 px-4 py-2 text-sm font-semibold"></p>
+    <p data-game-msg class="hidden mt-3 rounded-2xl bg-ink/5 px-4 py-2 text-sm font-semibold"></p>
   </section>
 
   <!-- Betting: shown between games. -->
-  <section data-betting class="rounded-3xl bg-[color:var(--card)] p-5 sm:p-6 shadow-pete border-2 border-[color:var(--ink)]/10">
+  <section data-betting class="rounded-3xl bg-card p-5 sm:p-6 shadow-pete border-2 border-ink/10">
 
-    <div class="text-xs font-semibold uppercase tracking-wider text-[color:var(--ink)]/50">How hard?</div>
+    <div class="text-xs font-semibold uppercase tracking-wider text-muted">How hard?</div>
     <div class="mt-2 grid gap-2 sm:grid-cols-3">
       {{range .Quizzes}}
       <button type="button" data-tier="{{.Slug}}"
               class="pete-tier rounded-2xl border-2 p-3 text-left transition">
         <div class="flex items-baseline justify-between gap-2">
           <span class="font-display text-lg font-bold">{{.Name}}</span>
-          <span class="font-display text-lg font-bold tabular-nums text-[color:var(--accent)]">{{printf "%.2f" .Fast}}×</span>
+          <span class="font-display text-lg font-bold tabular-nums text-accent">{{printf "%.2f" .Fast}}×</span>
         </div>
-        <p class="mt-0.5 text-xs text-[color:var(--ink)]/50">{{.Blurb}}</p>
-        <p class="mt-1.5 text-xs font-semibold text-[color:var(--ink)]/40">
+        <p class="mt-0.5 text-xs text-muted">{{.Blurb}}</p>
+        <p class="mt-1.5 text-xs font-semibold text-muted">
           {{.Limit}}s a question · slowest answer still pays {{printf "%.2f" .Buzzer}}×
         </p>
       </button>
@@ -112,7 +112,7 @@
 
     <div class="mt-5 flex flex-wrap items-center gap-x-6 gap-y-4">
       <div>
-        <div class="text-xs font-semibold uppercase tracking-wider text-[color:var(--ink)]/50">Your bet</div>
+        <div class="text-xs font-semibold uppercase tracking-wider text-muted">Your bet</div>
         <div class="font-display text-3xl font-bold tabular-nums"><span data-bet-amount>0</span></div>
       </div>
 
@@ -124,26 +124,26 @@
         </button>
         {{end}}
         <button type="button" data-bet-clear
-                class="rounded-full px-3 py-2 text-sm font-semibold text-[color:var(--ink)]/50 hover:text-[color:var(--ink)] transition">Clear</button>
+                class="rounded-full px-3 py-2 text-sm font-semibold text-muted hover:text-ink transition">Clear</button>
       </div>
 
       <button type="button" data-start
-              class="ml-auto rounded-full bg-[color:var(--accent)] px-8 py-3 font-display text-lg font-bold text-white shadow-pete
+              class="ml-auto rounded-full bg-accent px-8 py-3 font-display text-lg font-bold text-white shadow-pete
                      hover:brightness-105 active:translate-y-px disabled:opacity-40 disabled:pointer-events-none transition">
         Play
       </button>
     </div>
-    <p class="mt-3 text-center text-xs text-[color:var(--ink)]/40">
+    <p class="mt-3 text-center text-xs text-muted">
       The first question is the price of sitting down: you can only walk once you've answered one.
     </p>
-    <p data-table-msg class="hidden mt-3 rounded-2xl bg-[color:var(--ink)]/5 px-4 py-2 text-sm font-semibold"></p>
+    <p data-table-msg class="hidden mt-3 rounded-2xl bg-ink/5 px-4 py-2 text-sm font-semibold"></p>
   </section>
 
 </div>
 {{end}}
 
 {{define "scripts"}}
-<script src="/static/js/casino-fx.js" defer></script>
-<script src="/static/js/games.js" defer></script>
-<script src="/static/js/trivia.js" defer></script>
+<script src="{{asset "/static/js/casino-fx.js"}}" defer></script>
+<script src="{{asset "/static/js/games.js"}}" defer></script>
+<script src="{{asset "/static/js/trivia.js"}}" defer></script>
 {{end}}