diff --git a/frontend/src/components/react/admin/Settings.tsx b/frontend/src/components/react/admin/Settings.tsx
index fb9cb90..5c391ee 100644
--- a/frontend/src/components/react/admin/Settings.tsx
+++ b/frontend/src/components/react/admin/Settings.tsx
@@ -99,8 +99,9 @@ export default function Settings() {
             <option value="salon-noir">Salon Noir (black gallery wall)</option>
             <option value="gothic">Gothic (cathedral nightfall)</option>
             <option value="breakcore">Breakcore (Y2K rot + neon glitch)</option>
+            <option value="cybersigil">Cybersigil (dark frostbite + glitch)</option>
           </select>
-          <p className="text-[10px] font-display italic text-[var(--subtext0)] mt-2 tracking-wider">Salon trio tuned for the gallery aesthetic. Breakcore swaps that for early-2000s web rot — hot magenta on CRT violet, acid green, scanline noise.</p>
+          <p className="text-[10px] font-display italic text-[var(--subtext0)] mt-2 tracking-wider">Salon trio tuned for the gallery aesthetic. Breakcore swaps that for early-2000s web rot — hot magenta on CRT violet, acid green, scanline noise. Cybersigil is the moody cut — near-black ground, ice-cyan barbed sigil linework, bruised-magenta on contact, lingering chromatic glitch.</p>
         </div>
         <div>
           <label className="field-label">Custom CSS</label>
diff --git a/frontend/src/styles/global.css b/frontend/src/styles/global.css
index 5c6cbbf..d1fb418 100644
--- a/frontend/src/styles/global.css
+++ b/frontend/src/styles/global.css
@@ -165,6 +165,39 @@
   --rosewater: #F0DDE8;
 }
 
+/* CYBERSIGIL — Frostbite. Near-black ground, ice-cyan sigil linework,
+ * bruised-magenta primary accent, sterile bone-white text. Modern-breakcore
+ * melancholy: chromatic-aberration glitch, barbed sigil ornament, deep
+ * vignette + fine cold grain. Primary accent: bruised magenta (--mauve). */
+.cybersigil {
+  --crust: #020203;
+  --mantle: #050507;
+  --base: #070709;
+  --surface0: #0C0D11;
+  --surface1: #13151B;
+  --surface2: #1E2129;
+  --overlay0: #2A2F3A;
+  --overlay1: #3D4654;
+  --overlay2: #566174;
+  --text: #DCE6EC;        /* sterile bone-white, cool cast */
+  --subtext0: #7E8B99;
+  --subtext1: #AAB8C4;
+  --blue: #3FB4FF;        /* cold electric */
+  --lavender: #8E7CFF;    /* cold violet */
+  --sapphire: #3A5BFF;    /* deep cold hyperlink */
+  --sky: #4FE9FF;         /* ice-cyan — primary sigil line */
+  --teal: #2FD8D2;        /* frost mint — secondary neon */
+  --green: #5BE0A8;       /* cold jade */
+  --yellow: #E8C24A;      /* muted amber — inline code only */
+  --peach: #E07A5F;
+  --maroon: #5A1530;
+  --red: #FF3B5C;         /* siren — danger only */
+  --mauve: #C8327A;       /* bruised magenta — primary accent */
+  --pink: #E86AAE;        /* faded neon pink */
+  --flamingo: #E8A0C4;
+  --rosewater: #EAF2F6;   /* brightest bone — on-accent text */
+}
+
 html {
   font-family: var(--font-sans);
   font-feature-settings: "kern", "liga", "calt", "onum";
@@ -1839,6 +1872,560 @@ input[type="date"] { color-scheme: light; }
   color: var(--red);
 }
 
+/* ═══════════════════════════════════════════════════════════════════════
+ * CYBERSIGIL — Frostbite layer.
+ * Scoped to `.cybersigil`; salon / salon-noir / gothic / breakcore untouched.
+ * Aesthetic: modern-breakcore melancholy. Editorial serif body in tension
+ * with cold-mono sigil chrome — thin barbed vector linework, ice-cyan rest
+ * state, bruised-magenta on contact, RGB chromatic split that lingers
+ * (slower + sadder than breakcore's snap). Every control is a visible neon
+ * affordance — no bare text. Motion is reactive only; killed by
+ * prefers-reduced-motion at the very end of this file.
+ * ═══════════════════════════════════════════════════════════════════════ */
+
+/* Deep tube vignette — blacker, tighter than breakcore. */
+.cybersigil body::before {
+  background-image: radial-gradient(
+    ellipse at center,
+    transparent 40%,
+    color-mix(in srgb, var(--crust) 92%, transparent) 100%
+  );
+}
+
+/* Fine cold grain + tight scanlines. Lower opacity than breakcore, blue-
+ * shifted — atmospheric, not blown out. */
+.cybersigil body::after,
+html.cybersigil body::after {
+  opacity: 0.4;
+  background-image:
+    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='1.4' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.31 0 0 0 0 0.91 0 0 0 0 1 0 0 0 0.4 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>"),
+    repeating-linear-gradient(
+      0deg,
+      rgba(0, 0, 0, 0) 0,
+      rgba(0, 0, 0, 0) 2px,
+      rgba(0, 0, 0, 0.34) 3px,
+      rgba(0, 0, 0, 0) 4px
+    );
+  mix-blend-mode: screen;
+}
+
+/* Glow pools — ice-cyan + bruised magenta, large + faint. Moody, not lit. */
+.cybersigil .salon-atmosphere::before {
+  background: var(--sky);
+  opacity: 0.07;
+}
+.cybersigil .salon-atmosphere::after {
+  background: var(--mauve);
+  opacity: 0.06;
+}
+
+/* Selection — magenta block, bone text, cyan bleed. */
+.cybersigil ::selection {
+  background: var(--mauve);
+  color: var(--rosewater);
+  text-shadow: 0 0 6px var(--sky);
+}
+
+/* Static chromatic aberration on display heads + nameplate (resting state). */
+.cybersigil .prose h1,
+.cybersigil .prose h2,
+.cybersigil h1.font-display,
+.cybersigil .nameplate-title {
+  text-shadow:
+    -1px 0 0 color-mix(in srgb, var(--sky) 72%, transparent),
+    1px 0 0 color-mix(in srgb, var(--mauve) 72%, transparent),
+    0 0 22px color-mix(in srgb, var(--sky) 28%, transparent);
+}
+
+/* Nameplate underline → ice rule, hard magenta offset + cyan bloom. */
+.cybersigil .nameplate::after {
+  height: 2px;
+  bottom: -7px;
+  background: var(--sky);
+  box-shadow:
+    2px 2px 0 var(--mauve),
+    0 0 12px color-mix(in srgb, var(--sky) 70%, transparent);
+}
+@keyframes cs-shear {
+  0%   { clip-path: inset(0 0 0 0);     transform: translateX(0);
+         text-shadow: -1px 0 0 var(--sky), 1px 0 0 var(--mauve); }
+  22%  { clip-path: inset(14% 0 58% 0); transform: translateX(-6px);
+         text-shadow: -6px 0 0 var(--sky), 6px 0 0 var(--mauve); }
+  45%  { clip-path: inset(60% 0 12% 0); transform: translateX(5px);
+         text-shadow: 5px 0 0 var(--teal), -5px 0 0 var(--mauve); }
+  68%  { clip-path: inset(28% 0 44% 0); transform: translateX(-3px);
+         text-shadow: -3px 0 0 var(--mauve), 3px 0 0 var(--sky); }
+  100% { clip-path: inset(0 0 0 0);     transform: translateX(0);
+         text-shadow: -1px 0 0 var(--sky), 1px 0 0 var(--mauve); }
+}
+.cybersigil .nameplate:hover .nameplate-title {
+  animation: cs-shear 320ms steps(4, jump-none) 1;
+}
+
+/* Display heads — slow melancholic glitch-in on load (sadder than the
+ * breakcore snap; longer settle, deeper offsets). */
+@keyframes cs-load-glitch {
+  0%   { opacity: 0;   clip-path: inset(48% 0 48% 0); transform: translateX(-12px); }
+  18%  { opacity: 1;   clip-path: inset(6% 0 74% 0);  transform: translateX(9px); }
+  38%  {               clip-path: inset(70% 0 6% 0);  transform: translateX(-6px); }
+  58%  {               clip-path: inset(22% 0 40% 0); transform: translateX(4px); }
+  78%  {               clip-path: inset(4% 0 86% 0);  transform: translateX(-2px); }
+  100% { opacity: 1;   clip-path: none;               transform: translateX(0); }
+}
+.cybersigil .prose h1,
+.cybersigil h1.font-display {
+  animation: cs-load-glitch 620ms steps(5, jump-none) backwards;
+}
+
+/* Plate — dark glass card, ice frame, barbed sigil corner-brackets. The
+ * brackets are the theme signature: thin angular vector marks that ignite
+ * magenta on contact. */
+.cybersigil .plate {
+  position: relative;
+  background: var(--surface0);
+  box-shadow:
+    inset 0 0 0 1px color-mix(in srgb, var(--sky) 26%, transparent),
+    0 0 0 1px color-mix(in srgb, var(--sky) 14%, transparent),
+    0 22px 44px -28px rgba(79, 233, 255, 0.28),
+    0 0 26px -10px color-mix(in srgb, var(--mauve) 36%, transparent);
+}
+.cybersigil .plate::before,
+.cybersigil .plate::after {
+  content: "";
+  position: absolute;
+  width: 26px;
+  height: 26px;
+  border: 1.5px solid color-mix(in srgb, var(--sky) 70%, transparent);
+  filter: drop-shadow(0 0 4px color-mix(in srgb, var(--sky) 45%, transparent));
+  pointer-events: none;
+  transition: border-color 0.18s ease, filter 0.18s ease;
+}
+.cybersigil .plate::before {
+  top: -1px;
+  left: -1px;
+  border-right: 0;
+  border-bottom: 0;
+  clip-path: polygon(0 0, 100% 0, 100% 20%, 32% 20%, 32% 100%, 0 100%);
+}
+.cybersigil .plate::after {
+  right: -1px;
+  bottom: -1px;
+  border-left: 0;
+  border-top: 0;
+  clip-path: polygon(100% 0, 100% 100%, 0 100%, 0 80%, 68% 80%, 68% 0);
+}
+.cybersigil .plate:hover {
+  transform: translateY(-3px);
+  box-shadow:
+    inset 0 0 0 1px color-mix(in srgb, var(--mauve) 40%, transparent),
+    0 0 0 1px color-mix(in srgb, var(--mauve) 26%, transparent),
+    0 32px 60px -28px rgba(200, 50, 122, 0.42),
+    0 0 34px -8px color-mix(in srgb, var(--mauve) 48%, transparent);
+}
+.cybersigil .plate:hover::before,
+.cybersigil .plate:hover::after {
+  border-color: var(--mauve);
+  filter: drop-shadow(0 0 7px color-mix(in srgb, var(--mauve) 60%, transparent));
+}
+.cybersigil .plate:focus-visible {
+  box-shadow:
+    inset 0 0 0 2px var(--sky),
+    0 0 0 2px var(--mauve),
+    0 0 30px -6px color-mix(in srgb, var(--sky) 60%, transparent);
+}
+.cybersigil .plate:hover .plate-caption-title {
+  text-shadow: -1px 0 0 var(--sky), 1px 0 0 var(--mauve);
+}
+.cybersigil .plate-image {
+  background: var(--mantle);
+}
+.cybersigil .plate:hover .plate-image img {
+  filter:
+    drop-shadow(-3px 0 0 color-mix(in srgb, var(--mauve) 70%, transparent))
+    drop-shadow(3px 0 0 color-mix(in srgb, var(--sky) 70%, transparent))
+    saturate(0.92) contrast(1.05) brightness(0.96);
+}
+.cybersigil .plate .plate-image::after {
+  content: "";
+  position: absolute;
+  inset: 0;
+  pointer-events: none;
+  opacity: 0;
+  transform: translateY(-110%);
+  mix-blend-mode: screen;
+  background: linear-gradient(
+    180deg,
+    transparent 0%,
+    color-mix(in srgb, var(--sky) 24%, transparent) 46%,
+    color-mix(in srgb, var(--mauve) 64%, transparent) 49%,
+    color-mix(in srgb, var(--sky) 40%, transparent) 51%,
+    color-mix(in srgb, var(--sky) 22%, transparent) 54%,
+    transparent 100%
+  );
+}
+@keyframes cs-scan {
+  0%   { transform: translateY(-110%); opacity: 0; }
+  14%  { opacity: 1; }
+  86%  { opacity: 1; }
+  100% { transform: translateY(110%);  opacity: 0; }
+}
+.cybersigil .plate:hover .plate-image::after,
+.cybersigil .plate:focus-visible .plate-image::after {
+  animation: cs-scan 0.78s cubic-bezier(0.4, 0, 0.2, 1) 1;
+}
+.cybersigil .prose figure img,
+.cybersigil .prose img {
+  background:
+    linear-gradient(var(--surface0), var(--surface0)) padding-box,
+    linear-gradient(135deg, color-mix(in srgb, var(--sky) 40%, var(--surface2)), color-mix(in srgb, var(--mauve) 40%, var(--surface1))) border-box;
+}
+
+/* Section rule — masked barbed sigil glyph between cyan→magenta filaments. */
+.cybersigil .section-rule {
+  color: var(--sky);
+  font-family: var(--font-mono);
+  font-style: normal;
+  font-size: 0.76rem;
+  text-transform: uppercase;
+  letter-spacing: 0.24em;
+}
+.cybersigil .section-rule::before,
+.cybersigil .section-rule::after {
+  height: 1px;
+  opacity: 0.9;
+  background: linear-gradient(
+    to right,
+    transparent,
+    color-mix(in srgb, var(--sky) 75%, transparent) 45%,
+    color-mix(in srgb, var(--mauve) 75%, transparent) 55%,
+    transparent
+  );
+}
+.cybersigil .section-rule .ornament {
+  color: transparent;
+  width: 1.1em;
+  height: 1.1em;
+  background-color: var(--sky);
+  -webkit-mask: var(--cs-sigil) center / contain no-repeat;
+  mask: var(--cs-sigil) center / contain no-repeat;
+  filter: drop-shadow(0 0 5px color-mix(in srgb, var(--sky) 60%, transparent));
+}
+.cybersigil {
+  --cs-sigil: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23fff' stroke-width='1.5' stroke-linecap='round'><path d='M12 1 L12 23 M12 1 L9 4 M12 1 L15 4 M12 7 L7 10 M12 7 L17 10 M12 13 L8.5 16 M12 13 L15.5 16'/></svg>");
+}
+
+/* Readability — lift dim-on-near-black copy spots to the subtext ramp. */
+.cybersigil .prose h6,
+.cybersigil .prose del,
+.cybersigil .hljs-comment,
+.cybersigil .hljs-quote,
+.cybersigil .site-copyright,
+.cybersigil .slug-hint {
+  color: var(--subtext0);
+}
+
+/* Chips — thin ice outline, mono caps. */
+.cybersigil .chip {
+  background: transparent;
+  border-color: color-mix(in srgb, var(--sky) 55%, transparent);
+  color: var(--sky);
+  font-family: var(--font-mono);
+  font-style: normal;
+  font-size: 0.7rem;
+  text-transform: uppercase;
+  letter-spacing: 0.1em;
+  border-radius: 0;
+}
+.cybersigil .chip-accent {
+  background: var(--mauve);
+  color: var(--rosewater);
+  border-color: var(--mauve);
+}
+.cybersigil .chip-draft {
+  background: transparent;
+  border-color: color-mix(in srgb, var(--green) 60%, transparent);
+  color: var(--green);
+}
+.cybersigil .plate-caption-meta {
+  font-family: var(--font-mono);
+  letter-spacing: 0.16em;
+}
+.cybersigil .plate-caption-sep {
+  color: var(--sky);
+  opacity: 1;
+}
+
+/* Buttons & inputs — square, hard offset, ice→magenta neon. */
+.cybersigil .btn,
+.cybersigil .field-input,
+.cybersigil .topbar-control,
+.cybersigil .topbar-control kbd { border-radius: 0; }
+.cybersigil .btn--primary {
+  color: var(--rosewater);
+  border-color: var(--mauve);
+  box-shadow: 3px 3px 0 0 var(--sky);
+}
+.cybersigil .btn--primary:hover {
+  background: var(--sky);
+  border-color: var(--sky);
+  color: var(--crust);
+  box-shadow: 3px 3px 0 0 var(--mauve);
+}
+.cybersigil .btn--primary:active {
+  transform: translate(2px, 2px);
+  box-shadow: 1px 1px 0 0 var(--mauve);
+}
+.cybersigil .btn--danger {
+  box-shadow: 3px 3px 0 0 color-mix(in srgb, var(--red) 60%, var(--crust));
+}
+.cybersigil .btn--danger:hover {
+  box-shadow: 3px 3px 0 0 var(--mauve);
+}
+.cybersigil .btn--danger:active {
+  transform: translate(2px, 2px);
+  box-shadow: 1px 1px 0 0 var(--mauve);
+}
+.cybersigil .btn:focus-visible {
+  border-color: var(--sky);
+  box-shadow: 0 0 0 2px var(--sky);
+}
+.cybersigil .field-input:focus {
+  border-color: var(--sky);
+  background: color-mix(in srgb, var(--surface0) 85%, var(--sky) 8%);
+  box-shadow: 0 0 0 2px color-mix(in srgb, var(--sky) 35%, transparent);
+}
+.cybersigil .btn--ghost {
+  color: var(--sky);
+  border-color: color-mix(in srgb, var(--sky) 55%, transparent);
+  background: color-mix(in srgb, var(--surface0) 60%, transparent);
+  box-shadow: 3px 3px 0 0 color-mix(in srgb, var(--sky) 32%, var(--crust));
+}
+.cybersigil .btn--ghost:hover {
+  color: var(--crust);
+  background: var(--sky);
+  border-color: var(--sky);
+  box-shadow: 3px 3px 0 0 var(--mauve);
+}
+.cybersigil .btn--ghost:active {
+  transform: translate(2px, 2px);
+  box-shadow: 1px 1px 0 0 var(--mauve);
+}
+
+/* Back-link → sigil-marked neon return tab. */
+.cybersigil .back-link {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.5em;
+  font-family: var(--font-mono);
+  font-style: normal;
+  font-size: 0.7rem;
+  text-transform: uppercase;
+  letter-spacing: 0.16em;
+  color: var(--sky);
+  padding: 7px 13px;
+  background: color-mix(in srgb, var(--crust) 70%, transparent);
+  border: 1px solid var(--mauve);
+  box-shadow: 3px 3px 0 0 var(--mauve);
+  text-shadow: 0 0 6px color-mix(in srgb, var(--sky) 50%, transparent);
+}
+.cybersigil .back-link::before {
+  content: "";
+  width: 0.95em;
+  height: 0.95em;
+  flex: none;
+  background-color: currentColor;
+  -webkit-mask: var(--cs-sigil) center / contain no-repeat;
+  mask: var(--cs-sigil) center / contain no-repeat;
+  transform: rotate(-90deg);
+}
+.cybersigil .back-link:hover,
+.cybersigil .back-link:focus-visible {
+  color: var(--crust);
+  background: var(--sky);
+  border-color: var(--sky);
+  box-shadow: 3px 3px 0 0 var(--mauve);
+  text-shadow: none;
+}
+.cybersigil .back-link:active {
+  transform: translate(3px, 3px);
+  box-shadow: 0 0 0 0 var(--mauve);
+}
+
+/* Top-bar chrome — cold mono caps, hard offset. */
+.cybersigil .topbar-control {
+  font-family: var(--font-mono);
+  font-style: normal;
+  font-size: 0.72rem;
+  letter-spacing: 0.12em;
+  text-transform: uppercase;
+  color: var(--sky);
+  background: color-mix(in srgb, var(--crust) 60%, transparent);
+  border-color: color-mix(in srgb, var(--sky) 50%, transparent);
+}
+.cybersigil .topbar-control:hover {
+  color: var(--crust);
+  background: var(--mauve);
+  border-color: var(--mauve);
+  box-shadow: 2px 2px 0 0 var(--sky);
+}
+.cybersigil .topbar-control:focus-visible {
+  border-color: var(--sky);
+  box-shadow: 0 0 0 2px var(--sky);
+}
+.cybersigil .topbar-control--danger:hover {
+  background: var(--red);
+  border-color: var(--red);
+  color: var(--rosewater);
+  box-shadow: 2px 2px 0 0 var(--mauve);
+}
+.cybersigil .topbar-divider {
+  width: 2px;
+  background: repeating-linear-gradient(
+    180deg,
+    var(--sky) 0 3px,
+    transparent 3px 5px,
+    var(--mauve) 5px 8px,
+    transparent 8px 10px
+  );
+}
+
+/* Post prev/next — neon offset panels + cyan eyebrow. */
+.cybersigil .post-nav a { transition: box-shadow 0.15s ease, border-color 0.15s ease; }
+.cybersigil .post-nav a:hover {
+  border-color: var(--mauve);
+  box-shadow:
+    inset 0 0 0 1px color-mix(in srgb, var(--mauve) 40%, transparent),
+    4px 4px 0 0 var(--mauve);
+}
+.cybersigil .post-nav .pn-eyebrow {
+  color: var(--sky);
+  font-family: var(--font-mono);
+  letter-spacing: 0.18em;
+  text-shadow: 0 0 6px color-mix(in srgb, var(--sky) 45%, transparent);
+}
+
+/* Prose / code — cold terminal, amber inline, magenta quote, barbed rule. */
+.cybersigil .prose pre {
+  color: var(--sky);
+  background-color: color-mix(in srgb, var(--crust) 88%, transparent);
+  background-image: repeating-linear-gradient(
+    0deg,
+    rgba(0, 0, 0, 0) 0 2px,
+    color-mix(in srgb, var(--sky) 8%, transparent) 2px 3px,
+    rgba(0, 0, 0, 0) 3px 4px
+  );
+  border-color: var(--mauve);
+  border-left-color: var(--sky);
+  box-shadow:
+    0 0 0 1px color-mix(in srgb, var(--sky) 24%, transparent),
+    4px 4px 0 0 color-mix(in srgb, var(--mauve) 32%, var(--crust));
+}
+.cybersigil .prose pre code { color: inherit; }
+.cybersigil .prose :not(pre) code {
+  color: var(--yellow);
+  background: color-mix(in srgb, var(--yellow) 12%, transparent);
+  border-bottom-color: color-mix(in srgb, var(--yellow) 55%, transparent);
+}
+.cybersigil .prose blockquote {
+  border-left-color: var(--mauve);
+  background: color-mix(in srgb, var(--mauve) 8%, transparent);
+  box-shadow: -3px 0 16px -5px color-mix(in srgb, var(--mauve) 55%, transparent);
+  padding: 0.5rem 0 0.5rem 1.4rem;
+}
+.cybersigil .prose hr {
+  height: 3px;
+  opacity: 0.9;
+  background: repeating-linear-gradient(
+    90deg,
+    var(--sky) 0 12px,
+    var(--mauve) 12px 24px
+  );
+  box-shadow: 0 0 12px color-mix(in srgb, var(--sky) 42%, transparent);
+}
+.cybersigil .prose hr::before {
+  background: var(--sky);
+  box-shadow: 0 0 8px var(--sky);
+}
+.cybersigil .prose h3 { color: var(--pink); }
+.cybersigil .prose h4 { color: var(--teal); }
+.cybersigil .prose h5 { color: var(--green); font-family: var(--font-mono); }
+.cybersigil .prose a {
+  text-decoration-color: color-mix(in srgb, var(--sky) 55%, transparent);
+}
+.cybersigil .prose a:hover {
+  color: var(--mauve);
+  text-decoration-color: var(--mauve);
+}
+
+/* Scrollbar + caret — full-immersion cold chrome. */
+.cybersigil {
+  scrollbar-color: var(--sky) var(--crust);
+  caret-color: var(--mauve);
+}
+.cybersigil ::-webkit-scrollbar { width: 11px; height: 11px; }
+.cybersigil ::-webkit-scrollbar-track { background: var(--crust); }
+.cybersigil ::-webkit-scrollbar-thumb {
+  background: var(--sky);
+  border: 2px solid var(--crust);
+  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--mauve) 55%, transparent);
+}
+.cybersigil ::-webkit-scrollbar-thumb:hover { background: var(--mauve); }
+.cybersigil ::-webkit-scrollbar-corner { background: var(--crust); }
+
+/* Reading progress — ice scan with cold bloom. */
+.cybersigil .reading-progress {
+  background: var(--sky);
+  box-shadow: 0 0 8px var(--sky), 0 0 3px var(--mauve);
+}
+
+/* Glass / tooltip / catalogue tag — cold neon parity with breakcore. */
+.cybersigil .glass {
+  background-color: color-mix(in srgb, var(--surface0) 72%, transparent);
+  border-color: color-mix(in srgb, var(--sky) 42%, var(--surface2));
+  box-shadow:
+    inset 0 0 0 1px color-mix(in srgb, var(--sky) 22%, transparent),
+    0 0 0 1px color-mix(in srgb, var(--mauve) 14%, transparent),
+    0 14px 40px -24px rgba(0, 0, 0, 0.92);
+}
+.cybersigil .plate-tag-mini {
+  background: var(--crust);
+  color: var(--sky);
+  border: 1px solid var(--mauve);
+  border-radius: 0;
+  font-family: var(--font-mono);
+  font-weight: 500;
+}
+.cybersigil .kbd-tip {
+  background: var(--crust);
+  border-color: var(--mauve);
+  border-radius: 0;
+  color: var(--sky);
+  box-shadow: 2px 2px 0 var(--mauve);
+}
+.cybersigil .kbd-tip kbd {
+  color: var(--rosewater);
+  background: var(--surface0);
+  border-color: var(--mauve);
+  border-radius: 0;
+}
+.cybersigil input[type="date"] { color-scheme: dark; }
+
+/* Confirm dialog — hard edge, ice→magenta cap, chromatic title. */
+.cybersigil .cdialog-panel {
+  border-radius: 0;
+  padding-top: 1.85rem;
+}
+.cybersigil .cdialog-panel::before {
+  content: "";
+  position: absolute;
+  inset: 0 0 auto 0;
+  height: 2px;
+  background: linear-gradient(90deg, var(--sky), var(--mauve));
+}
+.cybersigil .cdialog-title {
+  text-shadow: -1px 0 0 var(--sky), 1px 0 0 var(--mauve);
+}
+
 /* ═══ Reduced motion — universal kill-switch. Final word in the file so it
  * overrides every animation/transition above, all themes. Content still
  * resolves to its final state (forwards-filled keyframes complete). ═══ */