feat: add Guanghu ice-lake visual layer

src/App.css

@@ -5,7 +5,11 @@
   height: 100%;
   width: 100%;
   overflow: hidden;
-  box-shadow: inset 0 0 0 1px var(--border-primary);
+  background:
+    radial-gradient(58rem 35rem at 82% -16%, var(--guanghu-aurora), transparent 62%),
+    radial-gradient(42rem 30rem at -12% 112%, var(--guanghu-glow), transparent 65%),
+    var(--surface-app);
+  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--border-primary) 82%, var(--accent-blue));
 }
 
 .app {
@@ -20,6 +24,7 @@
   min-width: 220px;
   display: flex;
   flex-direction: column;
+  background: linear-gradient(180deg, color-mix(in srgb, var(--surface-sidebar) 92%, var(--guanghu-glow)), var(--surface-sidebar));
 }
 
 .app__sidebar > * {
@@ -37,7 +42,9 @@
   flex-direction: column;
   position: relative;
   z-index: 20;
-  background: var(--surface-sidebar);
+  background:
+    linear-gradient(180deg, color-mix(in srgb, var(--surface-sidebar) 94%, var(--guanghu-glow)), var(--surface-sidebar));
+  box-shadow: 14px 0 30px color-mix(in srgb, var(--surface-app) 60%, transparent);
 }
 
 .app__note-list > * {
@@ -54,6 +61,26 @@
   flex-direction: column;
   container-type: inline-size;
   container-name: editor;
+  position: relative;
+  background:
+    linear-gradient(var(--guanghu-grid) 1px, transparent 1px),
+    linear-gradient(90deg, var(--guanghu-grid) 1px, transparent 1px),
+    color-mix(in srgb, var(--surface-editor) 94%, var(--guanghu-glow));
+  background-size: 32px 32px, 32px 32px, auto;
+}
+
+.app__editor::before {
+  content: '';
+  position: absolute;
+  inset: 0;
+  pointer-events: none;
+  background: linear-gradient(180deg, color-mix(in srgb, var(--surface-editor) 28%, transparent), transparent 13rem);
+  z-index: 0;
+}
+
+.app__editor > * {
+  position: relative;
+  z-index: 1;
 }
 
 .app__editor > * {

src/components/Editor.css

@@ -24,14 +24,36 @@
 
 .guanghu-portal-card {
   width: 100%;
-  margin: 0.5rem 0;
+  margin: 1.1rem 0;
-  padding: 1rem 1.1rem;
+  padding: 1.15rem 1.25rem 1.2rem;
-  border: 1px solid color-mix(in srgb, var(--colors-accent) 38%, var(--colors-border));
+  border: 1px solid color-mix(in srgb, var(--colors-accent) 46%, var(--colors-border));
-  border-radius: 0.85rem;
+  border-radius: 1rem;
   background:
-    radial-gradient(circle at top right, color-mix(in srgb, var(--colors-accent) 16%, transparent), transparent 48%),
+    linear-gradient(135deg, color-mix(in srgb, var(--colors-accent) 16%, transparent), transparent 42%),
-    var(--colors-surface);
+    radial-gradient(circle at 92% 16%, color-mix(in srgb, var(--colors-accent) 25%, transparent), transparent 36%),
-  box-shadow: 0 0.35rem 1.25rem color-mix(in srgb, black 10%, transparent);
+    var(--guanghu-card-highlight, var(--colors-surface));
+  box-shadow:
+    0 0.8rem 2.2rem color-mix(in srgb, black 14%, transparent),
+    inset 0 1px 0 color-mix(in srgb, white 28%, transparent);
+  overflow: hidden;
+  position: relative;
+  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
+}
+
+.guanghu-portal-card::before {
+  content: '';
+  position: absolute;
+  inset: 0 auto 0 0;
+  width: 3px;
+  background: linear-gradient(var(--colors-accent), color-mix(in srgb, var(--colors-accent) 12%, transparent));
+}
+
+.guanghu-portal-card:hover {
+  border-color: color-mix(in srgb, var(--colors-accent) 72%, var(--colors-border));
+  box-shadow:
+    0 1rem 2.6rem color-mix(in srgb, var(--colors-accent) 18%, transparent),
+    inset 0 1px 0 color-mix(in srgb, white 32%, transparent);
+  transform: translateY(-1px);
 }
 
 .guanghu-portal-card__eyebrow {
@@ -39,31 +61,36 @@
   align-items: center;
   justify-content: space-between;
   gap: 0.75rem;
-  margin-bottom: 0.55rem;
+  margin-bottom: 0.7rem;
   color: var(--colors-text-muted);
   font-size: 0.72rem;
-  letter-spacing: 0.08em;
+  font-weight: 650;
+  letter-spacing: 0.1em;
+  text-transform: uppercase;
 }
 
 .guanghu-portal-card__status {
-  padding: 0.18rem 0.55rem;
+  padding: 0.22rem 0.6rem;
   border-radius: 999px;
-  background: color-mix(in srgb, var(--colors-accent) 18%, transparent);
+  border: 1px solid color-mix(in srgb, var(--colors-accent) 28%, transparent);
+  background: color-mix(in srgb, var(--colors-accent) 16%, transparent);
   color: var(--colors-text);
   letter-spacing: normal;
 }
 
 .guanghu-portal-card__title {
   display: inline-flex;
-  font-size: 1.08rem;
+  font-size: 1.15rem;
-  font-weight: 650;
+  font-weight: 720;
+  letter-spacing: -0.015em;
 }
 
 .guanghu-portal-card__description {
-  margin: 0.45rem 0 0;
+  max-width: 68ch;
+  margin: 0.55rem 0 0;
   color: var(--colors-text-muted);
   font-size: 0.9rem;
-  line-height: 1.55;
+  line-height: 1.65;
 }
 
 /* Breadcrumb bar: border can still react to the data attribute, but the
@@ -116,6 +143,7 @@ body.mac-chrome .app:not(:has(.app__sidebar)):not(:has(.app__note-list)) .breadc
   overflow-anchor: none;
   display: flex;
   flex-direction: column;
+  scrollbar-color: color-mix(in srgb, var(--accent-blue) 42%, transparent) transparent;
 }
 
 .editor-scroll-area--sheet {
@@ -165,7 +193,7 @@ body.mac-chrome .app:not(:has(.app__sidebar)):not(:has(.app__note-list)) .breadc
 .editor__blocknote-container .bn-container {
   width: 100%;
   height: 100%;
-  background: var(--bg-primary);
+  background: color-mix(in srgb, var(--bg-primary) 92%, transparent);
   color: var(--text-primary);
   font-size: 15px;
   /* Override BlockNote's internal color variables so .bn-editor background
@@ -187,7 +215,28 @@ body.mac-chrome .app:not(:has(.app__sidebar)):not(:has(.app__note-list)) .breadc
 
 .editor__blocknote-container .bn-editor {
   width: 100%;
-  padding: 20px 0;
+  padding: 36px 0 72px;
+}
+
+.editor__blocknote-container .bn-editor > .bn-block-group {
+  padding: 1.25rem clamp(1rem, 3vw, 2.25rem) 3rem;
+  border: 1px solid color-mix(in srgb, var(--border-primary) 82%, transparent);
+  border-radius: 1.25rem;
+  background: color-mix(in srgb, var(--surface-editor) 86%, transparent);
+  box-shadow: 0 1.3rem 3.5rem color-mix(in srgb, black 8%, transparent);
+  backdrop-filter: blur(16px);
+}
+
+@media (max-width: 720px) {
+  .app__editor {
+    background-size: 22px 22px, 22px 22px, auto;
+  }
+
+  .editor__blocknote-container .bn-editor > .bn-block-group {
+    border-inline: 0;
+    border-radius: 0;
+    box-shadow: none;
+  }
 }
 
 .editor__blocknote-container .bn-suggestion-menu {

src/index.css

@@ -179,6 +179,12 @@
   --hover: var(--state-hover);
   --link-color: var(--accent-blue);
   --link-hover: var(--accent-blue-hover);
+
+  /* Guanghu visual layer — an app-owned, ice-lake palette. */
+  --guanghu-aurora: rgba(91, 181, 255, 0.2);
+  --guanghu-glow: rgba(38, 131, 235, 0.15);
+  --guanghu-grid: rgba(42, 113, 188, 0.06);
+  --guanghu-card-highlight: rgba(255, 255, 255, 0.76);
 }
 
 :root.dark,
@@ -330,6 +336,12 @@
   --hover: var(--state-hover);
   --link-color: var(--accent-blue);
   --link-hover: var(--accent-blue-hover);
+
+  /* Guanghu visual layer — deep lake, not a flat black canvas. */
+  --guanghu-aurora: rgba(76, 174, 255, 0.2);
+  --guanghu-glow: rgba(20, 118, 214, 0.24);
+  --guanghu-grid: rgba(126, 202, 255, 0.055);
+  --guanghu-card-highlight: rgba(28, 54, 80, 0.72);
 }
 
 /* --- Tailwind v4 theme inline: register colors + radii --- */