diff --git a/src/routes/admin/ui.tsx b/src/routes/admin/ui.tsx
index 3b5a05d..d855d3b 100644
--- a/src/routes/admin/ui.tsx
+++ b/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;
diff --git a/src/styles/components.css b/src/styles/components.css
new file mode 100644
index 0000000..5238313
--- /dev/null
+++ b/src/styles/components.css
@@ -0,0 +1,1105 @@
+/* Card - Glass Effect */
+.card {
+  background-color: var(--color-card);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-md);
+  padding: var(--spacing-lg);
+  margin-bottom: var(--spacing-lg);
+  border: 1px solid var(--color-border);
+  transition: all var(--transition-normal);
+  backdrop-filter: blur(var(--blur-md));
+  -webkit-backdrop-filter: blur(var(--blur-md));
+}
+
+/* Remove top margin for h2 elements in cards */
+.card h2 {
+  margin-top: 0;
+}
+
+/* Feed header styling */
+.feed-header {
+  margin-bottom: var(--spacing-md);
+}
+
+.feed-title {
+  font-size: var(--font-size-xl);
+  margin-bottom: var(--spacing-xs);
+  color: var(--color-text-primary);
+}
+
+.feed-description {
+  font-size: var(--font-size-md);
+  color: var(--color-text-secondary);
+  margin-top: 0;
+  margin-bottom: var(--spacing-sm);
+}
+
+.feed-description.empty {
+  color: var(--color-text-tertiary);
+  font-style: italic;
+}
+
+/* In-place editing styles */
+input.feed-title-edit,
+.feed-title-edit {
+  width: 100%;
+  font-size: var(--font-size-xl) !important;
+  font-weight: var(--font-weight-bold);
+  margin-bottom: var(--spacing-xs);
+  padding: 4px 6px !important;
+  background-color: transparent !important;
+  border: 1px solid var(--color-border);
+  color: var(--color-text-primary);
+  border-radius: var(--radius-sm);
+}
+
+textarea.feed-description-edit,
+.feed-description-edit {
+  width: 100%;
+  font-size: var(--font-size-md) !important;
+  margin-bottom: var(--spacing-sm);
+  padding: 4px 6px !important;
+  min-height: 60px;
+  background-color: transparent !important;
+  border: 1px solid var(--color-border);
+  color: var(--color-text-secondary);
+  font-family: var(--font-family);
+  border-radius: var(--radius-sm);
+}
+
+.hidden {
+  display: none !important;
+}
+
+/* Success button styles */
+.button-success {
+  background-color: var(--color-primary);
+  color: var(--color-text-on-primary);
+  border: 1px solid rgba(255, 255, 255, 0.1);
+  transition: all 0.5s ease;
+}
+
+.button-success:hover,
+.button-success:focus {
+  background-color: rgba(10, 132, 255, 0.9);
+}
+
+.button-success.saved {
+  background-color: var(--color-success);
+  transition: all 0.5s ease;
+}
+
+/* Force saved button to stay green on hover */
+.button-success.saved:hover {
+  background-color: var(--color-success);
+}
+
+/* Button container with space-between layout */
+.feed-buttons {
+  display: flex;
+  justify-content: space-between;
+  gap: var(--spacing-sm);
+}
+
+.feed-buttons-left {
+  display: flex;
+  gap: var(--spacing-sm);
+}
+
+/* Fixed width for action buttons to prevent layout shifts during state changes */
+.feed-buttons-left .button {
+  width: 140px; /* Fixed exact width instead of min-width */
+  justify-content: center; /* Ensure text is centered */
+  box-sizing: border-box; /* Ensure padding is included in width calculation */
+}
+
+/* Ensure anchor tags in button containers match button styling exactly */
+.feed-buttons-left a.button {
+  width: 140px; /* Same fixed width */
+  box-sizing: border-box;
+  text-align: center;
+}
+
+.feed-buttons-right {
+  margin-left: auto;
+}
+
+/* Button - VisionOS Style with consistent height */
+.button {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  position: relative;
+  overflow: hidden;
+  height: 44px; /* Fixed height for consistency */
+  padding: 0 var(--spacing-lg);
+  border-radius: var(--radius-md);
+  font-size: var(--font-size-md);
+  font-weight: var(--font-weight-medium);
+  text-decoration: none;
+  cursor: pointer;
+  transition:
+    all var(--transition-fast),
+    color 0.3s ease,
+    background-color 0.3s ease;
+  white-space: nowrap;
+  opacity: 1;
+
+  /* Liquid-glass depth: layered gradients + inner highlights */
+  background-color: rgba(10, 132, 255, 0.78);
+  background-image:
+    radial-gradient(
+      140% 120% at 18% 0%,
+      rgba(255, 255, 255, 0.38),
+      transparent 48%
+    ),
+    linear-gradient(
+      180deg,
+      rgba(10, 132, 255, 0.98) 0%,
+      rgba(10, 132, 255, 0.68) 100%
+    );
+  backdrop-filter: blur(var(--blur-sm));
+  -webkit-backdrop-filter: blur(var(--blur-sm));
+  border: 1px solid rgba(255, 255, 255, 0.16);
+  box-shadow:
+    0 14px 34px rgba(0, 0, 0, 0.22),
+    0 2px 6px rgba(0, 0, 0, 0.14),
+    inset 0 1px 0 rgba(255, 255, 255, 0.22),
+    inset 0 -1px 0 rgba(0, 0, 0, 0.26);
+  color: var(--color-text-on-primary);
+}
+
+.button::after {
+  content: "";
+  position: absolute;
+  inset: 0;
+  border-radius: inherit;
+  pointer-events: none;
+  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12);
+  opacity: 0.9;
+}
+
+.button:hover,
+.button:focus {
+  background-color: rgba(10, 132, 255, 0.86);
+  background-image:
+    radial-gradient(
+      140% 120% at 18% 0%,
+      rgba(255, 255, 255, 0.45),
+      transparent 50%
+    ),
+    linear-gradient(
+      180deg,
+      rgba(10, 132, 255, 1) 0%,
+      rgba(10, 132, 255, 0.74) 100%
+    );
+  box-shadow:
+    0 18px 46px rgba(0, 0, 0, 0.26),
+    0 6px 14px rgba(0, 0, 0, 0.16),
+    inset 0 1px 0 rgba(255, 255, 255, 0.22),
+    inset 0 -1px 0 rgba(0, 0, 0, 0.28);
+  transform: translateY(-1px);
+}
+
+.button:active {
+  transform: translateY(0);
+  box-shadow:
+    0 10px 26px rgba(0, 0, 0, 0.22),
+    0 2px 6px rgba(0, 0, 0, 0.12),
+    inset 0 1px 0 rgba(255, 255, 255, 0.18),
+    inset 0 -1px 0 rgba(0, 0, 0, 0.3);
+}
+
+.button-secondary {
+  background-color: rgba(60, 60, 67, 0.12);
+  background-image:
+    radial-gradient(
+      140% 120% at 18% 0%,
+      rgba(255, 255, 255, 0.26),
+      transparent 52%
+    ),
+    linear-gradient(
+      180deg,
+      rgba(60, 60, 67, 0.22) 0%,
+      rgba(60, 60, 67, 0.08) 100%
+    );
+  color: var(--color-text-primary);
+  border: 1px solid rgba(255, 255, 255, 0.12);
+}
+
+.button-secondary:hover,
+.button-secondary:focus {
+  background-color: rgba(60, 60, 67, 0.18);
+  background-image:
+    radial-gradient(
+      140% 120% at 18% 0%,
+      rgba(255, 255, 255, 0.3),
+      transparent 52%
+    ),
+    linear-gradient(
+      180deg,
+      rgba(60, 60, 67, 0.28) 0%,
+      rgba(60, 60, 67, 0.1) 100%
+    );
+}
+
+/* Light mode specific button styling */
+@media (prefers-color-scheme: light) {
+  .button-secondary {
+    background-color: rgba(60, 60, 67, 0.06);
+    background-image:
+      radial-gradient(
+        140% 120% at 18% 0%,
+        rgba(255, 255, 255, 0.55),
+        transparent 55%
+      ),
+      linear-gradient(
+        180deg,
+        rgba(60, 60, 67, 0.1) 0%,
+        rgba(60, 60, 67, 0.04) 100%
+      );
+    border: 1px solid rgba(60, 60, 67, 0.14);
+  }
+
+  .button-secondary:hover,
+  .button-secondary:focus {
+    background-color: rgba(60, 60, 67, 0.08);
+    background-image:
+      radial-gradient(
+        140% 120% at 18% 0%,
+        rgba(255, 255, 255, 0.62),
+        transparent 55%
+      ),
+      linear-gradient(
+        180deg,
+        rgba(60, 60, 67, 0.12) 0%,
+        rgba(60, 60, 67, 0.06) 100%
+      );
+  }
+}
+
+/* Logout button styling */
+.button-logout {
+  background-color: rgba(255, 159, 10, 0.78);
+  background-image:
+    radial-gradient(
+      140% 120% at 18% 0%,
+      rgba(255, 255, 255, 0.34),
+      transparent 50%
+    ),
+    linear-gradient(
+      180deg,
+      rgba(255, 159, 10, 0.98) 0%,
+      rgba(255, 159, 10, 0.66) 100%
+    );
+  color: var(--color-text-on-primary);
+  border: 1px solid rgba(255, 255, 255, 0.1);
+}
+
+.button-logout:hover,
+.button-logout:focus {
+  background-color: rgba(255, 159, 10, 0.86);
+  background-image:
+    radial-gradient(
+      140% 120% at 18% 0%,
+      rgba(255, 255, 255, 0.42),
+      transparent 52%
+    ),
+    linear-gradient(
+      180deg,
+      rgba(255, 159, 10, 1) 0%,
+      rgba(255, 159, 10, 0.72) 100%
+    );
+}
+
+/* Back button styling */
+.button-back {
+  display: inline-flex;
+  align-items: center;
+  padding-left: var(--spacing-md);
+  margin-bottom: var(--spacing-md);
+}
+
+.button-back:before {
+  content: "←";
+  margin-right: var(--spacing-sm);
+  font-size: var(--font-size-lg);
+}
+
+.button-danger {
+  background-color: rgba(255, 69, 58, 0.78);
+  background-image:
+    radial-gradient(
+      140% 120% at 18% 0%,
+      rgba(255, 255, 255, 0.34),
+      transparent 50%
+    ),
+    linear-gradient(
+      180deg,
+      rgba(255, 69, 58, 0.98) 0%,
+      rgba(255, 69, 58, 0.66) 100%
+    );
+}
+
+.button-danger:hover,
+.button-danger:focus {
+  background-color: rgba(255, 69, 58, 0.86);
+  background-image:
+    radial-gradient(
+      140% 120% at 18% 0%,
+      rgba(255, 255, 255, 0.42),
+      transparent 52%
+    ),
+    linear-gradient(
+      180deg,
+      rgba(255, 69, 58, 1) 0%,
+      rgba(255, 69, 58, 0.72) 100%
+    );
+}
+
+/* Small button variation */
+.button-small {
+  height: 36px; /* Smaller height */
+  padding: 0 var(--spacing-md);
+  font-size: var(--font-size-sm);
+}
+
+/* Form Elements */
+.form-group {
+  margin-bottom: var(--spacing-lg);
+}
+
+label {
+  display: block;
+  font-size: var(--font-size-sm);
+  font-weight: var(--font-weight-semibold);
+  margin-bottom: var(--spacing-xs);
+  color: var(--color-text-secondary);
+}
+
+input[type="text"],
+input[type="email"],
+input[type="search"],
+input[type="password"],
+textarea {
+  display: block;
+  width: 100%;
+  padding: var(--spacing-md);
+  font-size: var(--font-size-md);
+  border-radius: var(--radius-md);
+  border: 1px solid var(--color-border);
+  background-color: rgba(60, 60, 67, 0.1);
+  color: var(--color-text-primary);
+  transition: all var(--transition-fast);
+  box-sizing: border-box;
+  font-family: var(--font-family);
+  backdrop-filter: blur(var(--blur-sm));
+  -webkit-backdrop-filter: blur(var(--blur-sm));
+}
+
+input[type="search"] {
+  -webkit-appearance: none;
+  appearance: none;
+}
+
+input[type="search"]::-webkit-search-decoration,
+input[type="search"]::-webkit-search-cancel-button,
+input[type="search"]::-webkit-search-results-button,
+input[type="search"]::-webkit-search-results-decoration {
+  -webkit-appearance: none;
+}
+
+input:focus,
+textarea:focus {
+  outline: none;
+  border-color: var(--color-primary);
+  box-shadow: 0 0 0 2px rgba(10, 132, 255, 0.2);
+}
+
+/* Modal */
+.modal-bg {
+  display: none;
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(0, 0, 0, 0.3);
+  backdrop-filter: blur(var(--blur-lg));
+  -webkit-backdrop-filter: blur(var(--blur-lg));
+  justify-content: center;
+  align-items: center;
+  z-index: 1000;
+  opacity: 0;
+  transition: opacity var(--transition-normal);
+}
+
+.modal-bg.visible {
+  display: flex;
+  opacity: 1;
+}
+
+.modal {
+  background-color: var(--color-card);
+  padding: var(--spacing-xl);
+  border-radius: var(--radius-lg);
+  max-width: 90%;
+  width: 500px;
+  box-shadow: var(--shadow-xl);
+  transform: scale(0.98);
+  opacity: 0;
+  transition: all var(--transition-normal);
+  border: 1px solid var(--color-border);
+  backdrop-filter: blur(var(--blur-md));
+  -webkit-backdrop-filter: blur(var(--blur-md));
+}
+
+.modal-bg.visible .modal {
+  transform: scale(1);
+  opacity: 1;
+}
+
+.modal-header {
+  margin-bottom: var(--spacing-lg);
+}
+
+.modal-buttons {
+  display: flex;
+  justify-content: flex-end;
+  gap: var(--spacing-md);
+  margin-top: var(--spacing-xl);
+}
+
+/* Toggle/Switch */
+.toggle-switch {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: var(--spacing-md);
+}
+
+.toggle-switch input[type="checkbox"] {
+  height: 0;
+  width: 0;
+  visibility: hidden;
+  position: absolute;
+}
+
+.toggle-switch label {
+  cursor: pointer;
+  width: 50px;
+  height: 28px;
+  background: var(--color-text-tertiary);
+  display: block;
+  border-radius: 100px;
+  position: relative;
+  transition: background-color var(--transition-fast);
+}
+
+.toggle-switch label:after {
+  content: "";
+  position: absolute;
+  top: 2px;
+  left: 2px;
+  width: 24px;
+  height: 24px;
+  background: var(--color-text-on-primary);
+  border-radius: 90px;
+  transition: transform var(--transition-fast);
+  box-shadow: var(--shadow-sm);
+}
+
+.toggle-switch input:checked + label {
+  background: var(--color-primary);
+}
+
+.toggle-switch input:checked + label:after {
+  transform: translateX(22px);
+}
+
+/* Email Content Iframe */
+.email-iframe-container {
+  width: 100%;
+  overflow: hidden;
+  border-radius: var(--radius-md);
+  border: 1px solid var(--color-border);
+  background-color: #ffffff;
+}
+
+.email-iframe {
+  width: 100%;
+  height: 500px; /* Smaller default height */
+  border: none;
+  background-color: #ffffff;
+  transition: height 0.3s ease;
+}
+
+/* Dark mode specific styling for email iframe */
+@media (prefers-color-scheme: dark) {
+  .email-iframe-container {
+    background-color: #1c1c1e;
+    border-color: #3a3a3c;
+  }
+  .email-iframe {
+    background-color: #1c1c1e;
+  }
+}
+
+/* Email Raw View */
+.email-raw {
+  padding: var(--spacing-md);
+  background-color: rgba(30, 30, 32, 0.7);
+  border-radius: var(--radius-md);
+  border: 1px solid var(--color-border);
+  overflow: auto;
+  max-height: 500px; /* Match iframe default height */
+  backdrop-filter: blur(var(--blur-sm));
+}
+
+/* Light mode specific styling for Raw HTML view */
+@media (prefers-color-scheme: light) {
+  .email-raw {
+    background-color: rgba(240, 240, 245, 0.9);
+  }
+}
+
+.email-raw pre {
+  margin: 0;
+  font-family: var(--font-family-mono);
+  font-size: 14px;
+  white-space: pre-wrap;
+  word-break: break-word;
+}
+
+/* Email Metadata Styling */
+.email-meta {
+  margin-bottom: var(--spacing-md);
+  padding-bottom: var(--spacing-md);
+  border-bottom: 1px solid var(--color-border);
+}
+
+.email-meta h2 {
+  margin-top: 0;
+  margin-bottom: var(--spacing-md);
+  font-size: var(--font-size-xl);
+  color: var(--color-text-primary);
+}
+
+.email-metadata-grid {
+  display: grid;
+  grid-template-columns: 1fr;
+  grid-template-rows: repeat(4, auto);
+  gap: var(--spacing-sm);
+}
+
+@media (min-width: 640px) {
+  .email-metadata-grid {
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(2, auto);
+  }
+}
+
+/* Toggle buttons for email view */
+.toggle-view {
+  display: flex;
+  gap: var(--spacing-xs);
+  margin-bottom: var(--spacing-md);
+}
+
+.toggle-button {
+  padding: var(--spacing-sm) var(--spacing-md);
+  border-radius: var(--radius-md);
+  background-color: rgba(60, 60, 67, 0.1);
+  border: 1px solid var(--color-border);
+  color: var(--color-text-secondary);
+  cursor: pointer;
+  transition: all var(--transition-fast);
+  font-size: var(--font-size-sm);
+  font-weight: var(--font-weight-medium);
+}
+
+.toggle-button:hover {
+  background-color: rgba(60, 60, 67, 0.2);
+}
+
+.toggle-button.active {
+  background-color: var(--color-primary);
+  color: var(--color-text-on-primary);
+  border-color: var(--color-primary);
+}
+
+/* Email content container */
+.email-content {
+  margin-top: var(--spacing-md);
+  border-radius: var(--radius-md);
+  overflow: hidden;
+}
+
+/* Toolbar + segmented control (Apple-ish) */
+.toolbar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--spacing-sm);
+  flex-wrap: wrap;
+  margin-bottom: var(--spacing-md);
+}
+
+.toolbar-group {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--spacing-sm);
+  flex-wrap: wrap;
+}
+
+.toolbar-group-fill {
+  width: 100%;
+}
+
+input.search {
+  min-width: 280px;
+  flex: 1;
+  height: 40px;
+  border-radius: var(--radius-pill);
+  padding: 0 14px;
+  padding-left: 38px;
+  background-color: rgba(60, 60, 67, 0.14);
+  background-image: url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%2024%2024'%20fill='none'%20stroke='%238e8e93'%20stroke-width='2'%20stroke-linecap='round'%20stroke-linejoin='round'%3E%3Ccircle%20cx='11'%20cy='11'%20r='7'/%3E%3Cpath%20d='M21%2021l-4.3-4.3'/%3E%3C/svg%3E");
+  background-repeat: no-repeat;
+  background-position: 14px center;
+  background-size: 16px 16px;
+  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
+}
+
+@media (prefers-color-scheme: light) {
+  input.search {
+    background-color: rgba(60, 60, 67, 0.08);
+  }
+}
+
+input.search::placeholder {
+  color: var(--color-text-tertiary);
+}
+
+.actions-row {
+  display: flex;
+  justify-content: flex-end;
+  margin-top: var(--spacing-md);
+}
+
+.pill {
+  display: inline-flex;
+  align-items: center;
+  height: 28px;
+  padding: 0 10px;
+  border-radius: var(--radius-pill);
+  border: 1px solid var(--color-border);
+  background-color: rgba(60, 60, 67, 0.12);
+  color: var(--color-text-secondary);
+  font-size: var(--font-size-sm);
+  backdrop-filter: blur(var(--blur-sm));
+  -webkit-backdrop-filter: blur(var(--blur-sm));
+}
+
+.segmented {
+  display: inline-flex;
+  border-radius: var(--radius-pill);
+  padding: 2px;
+  border: 1px solid var(--color-border);
+  background-color: rgba(60, 60, 67, 0.12);
+  backdrop-filter: blur(var(--blur-sm));
+  -webkit-backdrop-filter: blur(var(--blur-sm));
+  box-shadow: var(--shadow-sm);
+}
+
+.segmented-item {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  padding: 8px 12px;
+  border-radius: var(--radius-pill);
+  text-decoration: none;
+  color: var(--color-text-secondary);
+  font-size: var(--font-size-sm);
+  font-weight: var(--font-weight-semibold);
+  user-select: none;
+  transition: all var(--transition-fast);
+}
+
+.segmented-item:hover {
+  color: var(--color-text-primary);
+}
+
+.segmented-item.is-active {
+  color: var(--color-text-primary);
+  background-color: rgba(255, 255, 255, 0.12);
+  box-shadow: var(--shadow-sm);
+}
+
+@media (prefers-color-scheme: light) {
+  .segmented-item.is-active {
+    background-color: rgba(255, 255, 255, 0.85);
+  }
+}
+
+/* Tables */
+.table-wrap {
+  overflow-x: auto;
+  border-radius: var(--radius-lg);
+  border: 1px solid var(--color-border);
+  background-color: rgba(60, 60, 67, 0.05);
+}
+
+@media (prefers-color-scheme: light) {
+  .table-wrap {
+    background-color: rgba(255, 255, 255, 0.6);
+  }
+}
+
+table.table {
+  width: 100%;
+  border-collapse: collapse;
+}
+
+table.table.table-feeds {
+  min-width: 860px;
+  table-layout: fixed;
+}
+
+table.table.table-emails {
+  min-width: 760px;
+  table-layout: fixed;
+}
+
+table.table th,
+table.table td {
+  padding: 10px 12px;
+  border-bottom: 1px solid var(--color-border);
+  text-align: left;
+  vertical-align: top;
+}
+
+/* Resizable headers */
+th.th-resizable {
+  position: relative;
+  padding-right: 18px;
+}
+
+.th-button {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 0;
+  border: none;
+  background: transparent;
+  color: inherit;
+  font: inherit;
+  cursor: pointer;
+  user-select: none;
+}
+
+.th-button:hover {
+  color: var(--color-text-primary);
+}
+
+.sort-indicator {
+  width: 12px;
+  height: 12px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  opacity: 0.75;
+  font-size: 12px;
+}
+
+.col-resizer {
+  position: absolute;
+  top: 0;
+  right: 0;
+  width: 12px;
+  height: 100%;
+  cursor: col-resize;
+  touch-action: none;
+}
+
+.col-resizer:after {
+  content: "";
+  position: absolute;
+  right: 5px;
+  top: 24%;
+  bottom: 24%;
+  width: 1px;
+  background: var(--color-border);
+  opacity: 0.9;
+  border-radius: 1px;
+}
+
+th.th-resizable:hover .col-resizer:after {
+  background: rgba(255, 255, 255, 0.2);
+}
+
+@media (prefers-color-scheme: light) {
+  th.th-resizable:hover .col-resizer:after {
+    background: rgba(0, 0, 0, 0.15);
+  }
+}
+
+body.is-resizing {
+  cursor: col-resize;
+  user-select: none;
+}
+
+table.table thead th {
+  font-size: var(--font-size-sm);
+  font-weight: var(--font-weight-semibold);
+  color: var(--color-text-secondary);
+  background-color: rgba(44, 44, 46, 0.35);
+  backdrop-filter: blur(var(--blur-sm));
+  -webkit-backdrop-filter: blur(var(--blur-sm));
+}
+
+@media (prefers-color-scheme: light) {
+  table.table thead th {
+    background-color: rgba(255, 255, 255, 0.55);
+  }
+}
+
+table.table tbody tr:hover {
+  background-color: rgba(255, 255, 255, 0.04);
+}
+
+@media (prefers-color-scheme: light) {
+  table.table tbody tr:hover {
+    background-color: rgba(0, 0, 0, 0.03);
+  }
+}
+
+table.table tbody tr:last-child td {
+  border-bottom: none;
+}
+
+table.table code {
+  font-family: var(--font-family-mono);
+  font-size: 13px;
+}
+
+.truncate {
+  display: block;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  max-width: 100%;
+}
+
+/* Compact copy-to-clipboard for table cells */
+.copyable.copyable-inline {
+  margin-bottom: 0;
+  padding: 0;
+  background-color: transparent;
+  border: none;
+}
+
+.copyable.copyable-inline .copyable-content {
+  padding: 6px 8px;
+  border-radius: var(--radius-sm);
+  width: 100%;
+}
+
+.copyable.copyable-inline .copyable-value {
+  margin-right: var(--spacing-xs);
+  word-break: normal;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.row-actions {
+  display: flex;
+  gap: 6px;
+  flex-wrap: wrap;
+}
+
+.button-delete {
+  transition:
+    background-color 180ms ease,
+    border-color 180ms ease,
+    color 180ms ease,
+    transform 180ms ease,
+    box-shadow 180ms ease;
+}
+
+.button-delete.is-confirming {
+  background-color: rgba(255, 69, 58, 0.22);
+  border-color: rgba(255, 69, 58, 0.65);
+  color: #fff;
+  box-shadow: 0 12px 28px rgba(255, 69, 58, 0.18);
+  transform: translateY(-1px);
+}
+
+@media (prefers-color-scheme: light) {
+  .button-delete.is-confirming {
+    background-color: rgba(255, 69, 58, 0.12);
+    color: var(--color-text-primary);
+  }
+}
+
+.feed-row.is-removing,
+.email-row.is-removing {
+  opacity: 0;
+  transform: translateY(-6px);
+  transition:
+    opacity 200ms ease,
+    transform 200ms ease;
+}
+
+.feed-item.is-removing {
+  opacity: 0;
+  transform: translateY(-6px);
+  overflow: hidden;
+  transition:
+    opacity 220ms ease,
+    transform 220ms ease,
+    max-height 220ms ease,
+    margin 220ms ease,
+    padding 220ms ease;
+}
+
+/* Spinner (buttons + toasts) */
+@keyframes spin {
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+.spinner {
+  width: 14px;
+  height: 14px;
+  border-radius: 999px;
+  border: 2px solid rgba(255, 255, 255, 0.35);
+  border-top-color: rgba(255, 255, 255, 0.95);
+  display: inline-block;
+  animation: spin 0.85s linear infinite;
+  flex: 0 0 auto;
+}
+
+@media (prefers-color-scheme: light) {
+  .spinner {
+    border-color: rgba(0, 0, 0, 0.16);
+    border-top-color: rgba(0, 0, 0, 0.55);
+  }
+}
+
+.button.is-loading {
+  pointer-events: none;
+}
+
+.button .spinner {
+  margin-right: 8px;
+}
+
+/* Toasts */
+.toast-stack {
+  position: fixed;
+  top: 18px;
+  right: 18px;
+  width: min(360px, calc(100vw - 36px));
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+  z-index: 2000;
+}
+
+.toast {
+  opacity: 0;
+  transform: translateY(-8px);
+  transition:
+    opacity 180ms ease,
+    transform 180ms ease;
+  border-radius: var(--radius-lg);
+  border: 1px solid rgba(255, 255, 255, 0.12);
+  background-color: rgba(44, 44, 46, 0.72);
+  backdrop-filter: blur(var(--blur-md));
+  -webkit-backdrop-filter: blur(var(--blur-md));
+  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.28);
+  padding: 12px 12px;
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 12px;
+  color: var(--color-text-primary);
+}
+
+@media (prefers-color-scheme: light) {
+  .toast {
+    background-color: rgba(255, 255, 255, 0.78);
+    border-color: rgba(60, 60, 67, 0.18);
+    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.14);
+  }
+}
+
+.toast.visible {
+  opacity: 1;
+  transform: translateY(0);
+}
+
+.toast-body {
+  display: flex;
+  gap: 10px;
+  align-items: flex-start;
+  flex: 1;
+  min-width: 0;
+}
+
+.toast-text {
+  font-size: 14px;
+  line-height: 1.35;
+  color: var(--color-text-primary);
+  word-break: break-word;
+  flex: 1;
+  min-width: 0;
+  user-select: text;
+}
+
+.toast-close {
+  appearance: none;
+  border: none;
+  background: transparent;
+  color: var(--color-text-tertiary);
+  font-size: 18px;
+  line-height: 1;
+  padding: 2px 6px;
+  cursor: pointer;
+  border-radius: var(--radius-sm);
+  flex: 0 0 auto;
+}
+
+.toast-close:hover {
+  background-color: rgba(255, 255, 255, 0.06);
+  color: var(--color-text-secondary);
+}
+
+@media (prefers-color-scheme: light) {
+  .toast-close:hover {
+    background-color: rgba(0, 0, 0, 0.06);
+  }
+}
+
+.toast-info {
+  border-color: rgba(10, 132, 255, 0.35);
+}
+
+.toast-success {
+  border-color: rgba(48, 209, 88, 0.35);
+}
+
+.toast-error {
+  border-color: rgba(255, 69, 58, 0.35);
+}
+
+/* Feed and Email Lists */
+.feed-list,
+.email-list {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+}
diff --git a/src/styles/layout.css b/src/styles/layout.css
new file mode 100644
index 0000000..751c564
--- /dev/null
+++ b/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);
+}
diff --git a/src/styles/utilities.css b/src/styles/utilities.css
new file mode 100644
index 0000000..20a6b35
--- /dev/null
+++ b/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);
+}
diff --git a/src/styles/variables.css b/src/styles/variables.css
new file mode 100644
index 0000000..b632fd5
--- /dev/null
+++ b/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. */