First commit

frontend/app/assets/css/_settings.scss

@@ -0,0 +1,73 @@
+@use 'mixins' as *;
+
+// ---------- Settings popup ----------
+.settings-overlay { @include overlay(120); }
+
+.settings-modal {
+  @include sheet(460px, min(560px, calc(100vh - 110px)));
+
+  &:focus, &:focus-visible { outline: none; }
+}
+
+.settings-modal-head { @include sheet-head; }
+
+.settings-title { @include sheet-title; }
+
+.settings-modal-body { @include sheet-body; }
+
+.settings-group + .settings-group {
+  margin-top: 22px;
+  padding-top: 22px;
+  border-top: 1px solid var(--border);
+}
+
+.settings-group-head {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  margin-bottom: 12px;
+}
+
+.settings-group-title { font-size: 0.92rem; font-weight: 700; color: var(--text); }
+
+.settings-group-hint { font-size: 0.8rem; color: var(--muted); }
+
+// segmented light / dark switch
+.theme-switch { @include segmented; }
+
+.theme-option {
+  display: inline-flex;
+  align-items: center;
+  gap: 7px;
+  @include segmented-tab(8px 16px, 0.86rem);
+}
+
+// accent colour swatches
+.accent-swatches { display: flex; flex-wrap: wrap; gap: 14px; }
+
+.accent-swatch {
+  display: grid;
+  place-items: center;
+  width: 30px;
+  height: 30px;
+  border-radius: 50%;
+  border: 0;
+  padding: 0;
+  color: #fff;
+  background: linear-gradient(135deg, var(--swatch), var(--swatch-2));
+  transition: transform 0.12s, box-shadow 0.15s;
+
+  &:hover { transform: scale(1.1); }
+
+  &:active { transform: scale(0.94); }
+
+  &.active { box-shadow: 0 0 0 2px var(--bg-elev), 0 0 0 4px var(--swatch); }
+}
+
+@include popup-anim(
+  'settings-popup',
+  '.settings-modal',
+  0.16s,
+  transform 0.2s cubic-bezier(0.22, 0.61, 0.36, 1),
+  -10px
+);