refactor(styles): migrate TS template literal styles to real CSS files

Extract CSS from TypeScript template literals into standalone .css files
(variables.css, layout.css, components.css, utilities.css) and update
src/routes/admin/ui.tsx to import them directly via Wrangler text imports,
concatenating the strings at runtime for the inline <style> tag.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/admin/ui.tsx

@@ -1,6 +1,11 @@
-import { designSystem } from "../../styles/index";
+import variablesCss from "../../styles/variables.css";
+import layoutCss from "../../styles/layout.css";
+import componentsCss from "../../styles/components.css";
+import utilitiesCss from "../../styles/utilities.css";
 import { interactiveScripts } from "../../scripts/index";
 
+const designSystem = [variablesCss, layoutCss, componentsCss, utilitiesCss].join("\n");
+
 type LayoutProps = {
   title: string;
   children: import("hono/jsx").Child;

src/styles/layout.css

@@ -0,0 +1,193 @@
+/* Base Page Layout */
+.page {
+  font-family: var(--font-family);
+  line-height: 1.5;
+  background-color: var(--color-background);
+  color: var(--color-text-primary);
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  transition: background-color var(--transition-normal);
+  overflow-x: hidden;
+  margin: 0;
+  padding: 0;
+  -webkit-font-smoothing: antialiased;
+  text-rendering: optimizeLegibility;
+
+  /* Liquid-glass-ish background (subtle, non-distracting) */
+  background-image:
+    radial-gradient(
+      1200px circle at 20% 10%,
+      rgba(10, 132, 255, 0.18),
+      transparent 55%
+    ),
+    radial-gradient(
+      900px circle at 80% 20%,
+      rgba(94, 92, 230, 0.14),
+      transparent 60%
+    ),
+    radial-gradient(
+      700px circle at 50% 100%,
+      rgba(48, 209, 88, 0.1),
+      transparent 60%
+    ),
+    linear-gradient(
+      135deg,
+      rgba(255, 255, 255, 0.03) 0%,
+      rgba(0, 0, 0, 0.03) 100%
+    );
+  background-attachment: fixed;
+}
+
+/* Main Container */
+.container {
+  width: 100%;
+  max-width: 980px;
+  margin: 0 auto;
+  padding: var(--spacing-xl);
+  box-sizing: border-box;
+}
+
+/* Wider layout for data-dense pages (tables) */
+.container-wide {
+  max-width: 1440px;
+}
+
+/* Header Styles */
+.header {
+  margin-bottom: var(--spacing-xl);
+}
+
+.header h1 {
+  font-size: var(--font-size-xxl);
+  font-weight: var(--font-weight-bold);
+  margin-bottom: var(--spacing-xs);
+  line-height: 1.2;
+  background: var(--gradient-title);
+  -webkit-background-clip: text;
+  background-clip: text;
+  -webkit-text-fill-color: transparent;
+  display: inline-block;
+}
+
+.header p {
+  font-size: var(--font-size-lg);
+  color: var(--color-text-secondary);
+  margin-top: 0;
+  max-width: 80%;
+}
+
+/* Authentication Screen Layout */
+.auth-container {
+  min-height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background-color: var(--color-background);
+}
+
+.auth-card {
+  width: 100%;
+  max-width: 400px;
+  padding: var(--spacing-xl);
+  background-color: var(--color-card);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-xl);
+  border: 1px solid var(--color-border);
+  transition: all var(--transition-normal);
+  backdrop-filter: blur(var(--blur-md));
+  -webkit-backdrop-filter: blur(var(--blur-md));
+}
+
+.auth-logo {
+  text-align: center;
+  margin-bottom: var(--spacing-xl);
+}
+
+.auth-title {
+  font-size: var(--font-size-xl);
+  text-align: center;
+  margin-bottom: var(--spacing-xl);
+}
+
+.auth-error {
+  color: var(--color-danger);
+  background-color: rgba(255, 59, 48, 0.1);
+  padding: var(--spacing-md);
+  border-radius: var(--radius-md);
+  margin-bottom: var(--spacing-lg);
+  text-align: center;
+  font-weight: var(--font-weight-medium);
+  backdrop-filter: blur(var(--blur-sm));
+  -webkit-backdrop-filter: blur(var(--blur-sm));
+}
+
+.auth-form {
+  margin-bottom: var(--spacing-lg);
+}
+
+.auth-button {
+  width: 100%;
+  margin-top: var(--spacing-lg);
+}
+
+/* Responsive Adjustments */
+@media (max-width: 768px) {
+  .container {
+    padding: var(--spacing-md);
+  }
+
+  .header {
+    padding: var(--spacing-md) 0;
+    margin-bottom: var(--spacing-lg);
+  }
+
+  .header h1 {
+    font-size: var(--font-size-xl);
+  }
+}
+
+.header-with-actions {
+  display: flex;
+  justify-content: space-between;
+  align-items: flex-start;
+  margin-bottom: var(--spacing-xl);
+}
+
+.header-title {
+  flex: 1;
+}
+
+.header h1,
+.header-title h1 {
+  font-size: var(--font-size-xxl);
+  font-weight: var(--font-weight-bold);
+  margin-bottom: var(--spacing-xs);
+  line-height: 1.2;
+  color: var(--color-text-primary); /* Fallback color */
+  background: var(--gradient-title);
+  -webkit-background-clip: text;
+  background-clip: text;
+  -webkit-text-fill-color: transparent;
+  display: inline-block;
+}
+
+.header p,
+.header-title p {
+  font-size: var(--font-size-lg);
+  color: var(--color-text-secondary);
+  margin-top: 0;
+  max-width: 80%;
+}
+
+.header-actions {
+  display: flex;
+  align-items: center;
+  margin-top: var(--spacing-md);
+}
+
+.feed-title {
+  font-size: var(--font-size-xl);
+  margin-bottom: var(--spacing-md);
+  color: var(--color-text-primary);
+}

src/styles/utilities.css

@@ -0,0 +1,126 @@
+/* Animations */
+@keyframes fadeIn {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
+}
+
+.fade-in {
+  animation: fadeIn 0.5s ease-out;
+}
+
+.muted {
+  color: var(--color-text-secondary);
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .fade-in {
+    animation: none;
+  }
+
+  * {
+    scroll-behavior: auto !important;
+    transition-duration: 0.01ms !important;
+  }
+}
+
+/* Copyable content styling */
+.copyable {
+  position: relative;
+  display: flex;
+  align-items: center;
+  margin-bottom: var(--spacing-xs);
+  padding: var(--spacing-sm) var(--spacing-md);
+  background-color: rgba(60, 60, 67, 0.1);
+  border-radius: var(--radius-md);
+  transition: background-color var(--transition-fast);
+}
+
+/* When inside a grid, ensure proper fit */
+.email-metadata-grid .copyable {
+  margin-bottom: 0; /* Remove bottom margin inside grid */
+}
+
+.copyable-label {
+  font-weight: var(--font-weight-semibold);
+  color: var(--color-text-secondary);
+  margin-right: var(--spacing-sm);
+  user-select: none;
+  white-space: nowrap;
+}
+
+.copyable-content {
+  display: inline-flex;
+  align-items: center;
+  cursor: pointer;
+  padding: var(--spacing-xs) var(--spacing-sm);
+  border-radius: var(--radius-sm);
+  transition: background-color var(--transition-fast);
+  width: fit-content;
+  overflow: hidden; /* Prevent overflow in small containers */
+  flex: 1; /* Take remaining space */
+}
+
+.copyable-content:hover {
+  background-color: rgba(60, 60, 67, 0.2);
+}
+
+.copyable-value {
+  word-break: break-all;
+  margin-right: var(--spacing-xs);
+  overflow: hidden;
+  text-overflow: ellipsis;
+  flex: 1;
+}
+
+.copy-icon-container {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  position: relative;
+  width: 20px;
+  height: 20px;
+}
+
+.copy-icon {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+}
+
+/* Simplified icon states and transitions */
+.copy-icon-original {
+  opacity: 0.6;
+  transition:
+    opacity 0.2s ease,
+    transform 0.2s ease;
+}
+
+/* Only apply hover effect when not in copied state */
+.copyable-content:hover:not(.copied) .copy-icon-original {
+  opacity: 1;
+}
+
+.copy-icon-success {
+  opacity: 0;
+  transform: translate(-50%, -50%) scale(0.8);
+  color: var(--color-success);
+  transition:
+    opacity 0.2s ease,
+    transform 0.2s ease;
+}
+
+/* When copied, hide original and show success icon with a smooth transition */
+.copyable-content.copied .copy-icon-original {
+  opacity: 0;
+  transform: translate(-50%, -50%) scale(0.8);
+}
+
+.copyable-content.copied .copy-icon-success {
+  opacity: 1;
+  transform: translate(-50%, -50%) scale(1);
+}

src/styles/variables.css

@@ -0,0 +1,125 @@
+:root {
+  /* Typography - Prefer system UI fonts (Apple HIG-ish) */
+  --font-family:
+    -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
+    "Helvetica Neue", Arial, sans-serif;
+  --font-family-mono:
+    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
+    "Courier New", monospace;
+  color-scheme: light dark;
+  --font-size-xs: 12px;
+  --font-size-sm: 14px;
+  --font-size-md: 16px;
+  --font-size-lg: 20px;
+  --font-size-xl: 24px;
+  --font-size-xxl: 32px;
+  --font-weight-regular: 400;
+  --font-weight-medium: 500;
+  --font-weight-semibold: 600;
+  --font-weight-bold: 700;
+
+  /* Colors - Dark Mode (Default) */
+  --color-primary: #0a84ff;
+  --color-primary-dark: #409cff;
+  --color-secondary: #5e5ce6;
+  --color-success: #30d158;
+  --color-warning: #ff9f0a;
+  --color-danger: #ff453a;
+  --color-danger-dark: #ff6961;
+  --color-background: rgba(
+    28,
+    28,
+    30,
+    0.95
+  ); /* Semi-transparent for glass effect */
+  --color-card: rgba(44, 44, 46, 0.8); /* Semi-transparent for glass effect */
+  --color-border: rgba(255, 255, 255, 0.08);
+  --color-text-primary: #ffffff;
+  --color-text-secondary: #ebebf5;
+  --color-text-tertiary: #8e8e93;
+  --color-text-on-primary: #ffffff;
+  --color-logout: rgba(255, 159, 10, 0.8); /* Orange-tinted for logout */
+
+  /* Gradients */
+  --gradient-title: linear-gradient(
+    135deg,
+    var(--color-primary),
+    var(--color-secondary)
+  );
+
+  /* Shadows for dark mode */
+  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
+  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.2);
+  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
+  --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.2);
+
+  /* Spacing */
+  --spacing-xs: 4px;
+  --spacing-sm: 8px;
+  --spacing-md: 16px;
+  --spacing-lg: 24px;
+  --spacing-xl: 32px;
+  --spacing-xxl: 48px;
+
+  /* Radius */
+  --radius-sm: 8px;
+  --radius-md: 12px;
+  --radius-lg: 16px;
+  --radius-pill: 9999px;
+
+  /* Animation - Subtle */
+  --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
+  --transition-normal: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
+  --transition-slow: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
+
+  /* Blur for glass effect */
+  --blur-sm: 8px;
+  --blur-md: 12px;
+  --blur-lg: 20px;
+}
+
+/* Light Mode Support - Based on device preference */
+@media (prefers-color-scheme: light) {
+  :root {
+    --color-primary: #0070f3;
+    --color-primary-dark: #0051a8;
+    --color-secondary: #5e5ce6;
+    --color-success: #34c759;
+    --color-warning: #ff9500;
+    --color-danger: #ff3b30;
+    --color-danger-dark: #d70015;
+    --color-background: rgba(
+      245,
+      245,
+      247,
+      0.9
+    ); /* Semi-transparent for glass effect */
+    --color-card: rgba(
+      255,
+      255,
+      255,
+      0.8
+    ); /* Semi-transparent for glass effect */
+    --color-border: rgba(0, 0, 0, 0.06);
+    --color-text-primary: #000000;
+    --color-text-secondary: #666666;
+    --color-text-tertiary: #999999;
+    --color-text-on-primary: #ffffff;
+    --color-logout: rgba(255, 149, 0, 0.8); /* Orange-tinted for logout */
+
+    /* Reset shadows for light mode */
+    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.03);
+    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
+    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.06);
+    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.08);
+
+    /* Update gradient for light mode */
+    --gradient-title: linear-gradient(
+      135deg,
+      var(--color-primary),
+      var(--color-secondary)
+    );
+  }
+}
+
+/* No external font imports. */