A cozy theme for Kagi Search. Be sure to set the default Kagi themes to "Calm Blue" and "Moon Dark" for the themes to apply properly.

cozy-kagi-theme.css

:root {
  --sand1: hsl(50, 20%, 99%);
  --sand2: hsl(60, 7.7%, 97.5%);
  --sand3: hsl(59, 6.5%, 95.1%);
  --sand4: hsl(58, 6.1%, 92.9%);
  --sand5: hsl(57, 6%, 90.7%);
  --sand6: hsl(56, 5.9%, 88.4%);
  --sand7: hsl(55, 5.9%, 85.2%);
  --sand8: hsl(51, 6%, 77.1%);
  --sand9: hsl(50, 2%, 55.7%);
  --sand10: hsl(55, 1.7%, 51.9%);
  --sand11: hsl(50, 2%, 43.1%);
  --sand12: hsl(50, 6%, 10%);
  --amber1: hsl(39, 70%, 99%);
  --amber2: hsl(40, 100%, 96.5%);
  --amber3: hsl(44, 100%, 91.7%);
  --amber4: hsl(43, 100%, 86.8%);
  --amber5: hsl(42, 100%, 81.8%);
  --amber6: hsl(38, 99.7%, 76.3%);
  --amber7: hsl(36, 86.1%, 67.1%);
  --amber8: hsl(35, 85.2%, 55.1%);
  --amber9: hsl(39, 100%, 57%);
  --amber10: hsl(35, 100%, 55.5%);
  --amber11: hsl(30, 100%, 34%);
  --amber12: hsl(20, 80%, 17%);

  --background-color: var(--sand2);
  --color-primary: var(--sand12);
  --search-result-title: var(--color-primary);
  --search-result-title-hover: var(--color-primary);
  --result-item-title-border_hover: var(--color-primary);
  --domain-rank-icon-color-normal: var(--sand7);
  --search-result-date-bg: var(--sand3);
  --search-result-content-text: var(--sand11);
  --inline-domain-tag-bg: var(--sand3);
  --result-item-title-border: var(--background-color);
  --color-primary-dim_5: var(--sand11);

  --inline-widget-bg: var(--sand3);

  --search-result-date-new: var(--amber11);
  --search-result-date-new-bg: var(--amber3);

  --related-item-bg: var(--sand3);

  --search-result-gap: 40px;
  --m_sri_gap_color: var(--background-color);
}

@media (prefers-color-scheme: dark) {
  :root {
    --sand1: hsl(61, 2%, 8.3%);
    --sand2: hsl(60, 3.7%, 10.6%);
    --sand3: hsl(58, 3.7%, 13.1%);
    --sand4: hsl(57, 3.6%, 15.3%);
    --sand5: hsl(56, 3.7%, 17.4%);
    --sand6: hsl(55, 3.7%, 19.9%);
    --sand7: hsl(53, 3.7%, 23.6%);
    --sand8: hsl(50, 3.8%, 30.6%);
    --sand9: hsl(50, 4%, 42.7%);
    --sand10: hsl(52, 3.1%, 48.3%);
    --sand11: hsl(50, 4%, 61.8%);
    --sand12: hsl(56, 4%, 92.8%);
    --amber1: hsl(36, 100%, 6.1%);
    --amber2: hsl(35, 100%, 7.6%);
    --amber3: hsl(32, 100%, 10.2%);
    --amber4: hsl(32, 100%, 12.4%);
    --amber5: hsl(33, 100%, 14.6%);
    --amber6: hsl(35, 100%, 17.1%);
    --amber7: hsl(35, 91%, 21.6%);
    --amber8: hsl(36, 100%, 25.5%);
    --amber9: hsl(39, 100%, 57%);
    --amber10: hsl(43, 100%, 64%);
    --amber11: hsl(39, 90%, 49.8%);
    --amber12: hsl(39, 97%, 93.2%);
  }
}

._0_queryInfo {
  margin-bottom: 24px;
}

.domain-favicon {
  display: none;
}

.crisp-edges {
  image-rendering: optimizespeed;
  image-rendering: crisp_edges;
}

._0_img-results .item img.fade {
  opacity: 0;
  transition: none;
}

.quick-search-btn {
  transition: transform 0.4s ease-in-out;
}

/* Hide the doggo mascot, clouds, beta tag, and footer */
.doggo-sit,
.cloud_1,
.cloud_2,
.app-beta-tag,
.footer {
  display: none;
}

body {
  font-family: Inter, system-ui, sans-serif;
}

#help_modal .section-title,
.btn.--lg,
.button-primary,
.font-lufga,
.quick-settings-header__title,
.search-form #searchFormSubmitBtn,
.search-form .search-input-title,
.inlineHeader {
  font-family: Inter, system-ui, sans-serif;
}

body {
  color: var(--sand12);
  background-color: var(--background-color);
}

.btn.--yellow {
  background-color: var(--sand12);
  border: 1px solid var(--sand12);
  color: var(--sand1);
  transition: ease 150ms;
}

.btn.--yellow:hover {
  background-color: var(--sand11);
  border: 1px solid var(--sand11);
}

#quickSettingsOpenBtn a {
  color: var(--sand11);
  background-color: var(--sand2);
  border: 0px solid var(--sand7);
  border-radius: 4px;
}

.search-form .search-input {
  background-color: var(--sand3);
  border-radius: 16px;
}

.search-form .search-input-container {
  border: 1px solid var(--sand7);
  background-color: var(--sand3);
  box-shadow: 0 0 0 0px var(--sand4);
  border-radius: 16px;
  /* fix input text centering */
  height: 50px;
  transition: box-shadow 150ms;
}

.search-form .search-input-container:focus-within {
  border: 1px solid var(--sand8);
  box-shadow: 0 0 0 3px var(--sand4);
}

.search-form .search-form-icons {
  background-color: var(--sand3);
}

.app-header .search-form .spt {
  background: linear-gradient(90deg, transparent 0, var(--sand3) 100%);
}

.search-form .auto_suggestions {
  border: 1px solid var(--sand8);
  padding-top: 24px;
}

/* auto suggest on result page */
.auto_suggestions {
  background-color: var(--sand3);
  border-top: 0 !important;
}

.auto_suggestions .auto_item.highlighted {
  background-color: var(--sand4);
}

.auto_suggestions .auto_suggestions_in {
  border-top: 0px solid var(--sand7);
}

.auto_suggestions .auto_suggestions_lenses {
  border-top: 1px solid var(--sand4);
}

/* auto suggest on landing page */
.search-form .autosugg-landing {
  top: 108px;
}

.search-form {
  align-items: center;
}

.landing-category-select {
  width: auto;
  position: absolute;
  transform: translate(-50%, 50px);
  left: 57%;
}

.landing_cat_buttons {
  background-color: transparent;
}

._0_sri-highlight:before {
  background: var(--amber9);
}

div.app-content-box:not(.app-nav, .top-panel-box) a:visited,
div.main-content:not(.app-nav, .top-panel-box) a:visited {
  color: var(--sand11);
}

.related-items a {
  color: var(--sand12);
}

.related-items a:hover {
  background-color: var(--sand4);
  color: var(--sand12);
}

._0_d_info_ranking.k_ui_btn_group input:checked + .box.k_ui_btn:before,
.box.--active:before,
.box._0_sri-w-highlight:before,
.box:hover:before {
  border: 3px solid var(--amber7);
}

.k_ui_dropdown_data_list {
  background-color: var(--sand3);
  border: 1px solid var(--sand7);
}
.k_ui_dropdown_data_list a:hover {
  background-color: var(--sand4);
}

/* menu button results page */
#accountContainer .menu-icon a {
  color: var(--sand10);
  border: 0px solid var(--sand7);
}

/* dropdown */
.k_ui_dropdown_data_list .list_items > ._0_k_ui_dropdown_li.__hover,
.k_ui_dropdown_data_list .list_items > ._0_k_ui_dropdown_li:focus-visible,
.k_ui_dropdown_data_list .list_items > ._0_k_ui_dropdown_li:hover,
.k_ui_dropdown_data_list .list_items > a.__hover,
.k_ui_dropdown_data_list .list_items > a:focus-visible,
.k_ui_dropdown_data_list .list_items > a:hover,
.k_ui_dropdown_data_list .list_items > div.__hover,
.k_ui_dropdown_data_list .list_items > div:focus-visible,
.k_ui_dropdown_data_list .list_items > div:hover {
  background-color: var(--sand5);
  color: var(--dd-hover-color);
}

/* select button */
.k_ui_btn_group {
  background-color: var(--sand3);
  border: 1px solid var(--sand7);
  border-radius: 8px;
  display: flex;
  font-size: 0.875rem;
}
.k_ui_btn_group .k_ui_btn:hover {
  background-color: var(--sand4);
  color: var(--sand12);
}
._0_d_info_ranking.k_ui_btn_group input:checked + .k_ui_btn,
.k_ui_btn_group .k_ui_btn.--active,
.k_ui_btn_group .k_ui_btn._0_sri-w-highlight.box {
  background-color: var(--sand5);
  color: var(--sand12);
}

.ranked-box-wrapper {
  max-width: 420px;
  background-color: var(--sand3);
  border-radius: 5px;
  width: 100vw;
  box-shadow: 0 0 20px var(--ranked-box-shadow);
}
.d-info-box-title-header.--trackers {
  background: linear-gradient(90deg, var(--amber10) 0.72%, var(--amber9) 100%);
}
.d-info-domain-title {
  color: hsl(50, 6%, 10%);
  text-shadow: none;
}
.d-info-body {
  flex-wrap: wrap;
  background-color: var(--sand2);
  border-radius: 5px;
}

/* video */
.videoResultItem {
  background-color: var(--sand2);
}

/* quick settings */
.quick-settings {
  position: fixed;
  transform: translateX(100%);
  transition: transform 0.15s ease-in-out;
  top: 0;
  right: 0;
  max-width: 450px;
  height: 100%;
  z-index: 102;
  background-color: var(--sand2);
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--sand6);
  overflow: auto;
}
.quick-settings-region__dropdown {
  width: 100%;
  display: block;
  background-color: var(--sand3);
  border-radius: 5px;
}
.quick-settings-region__dropdown:hover {
  background-color: var(--sand4);
}
.dropdown.dd-b .dd-list,
.dropdown.dd-b .dd-toggle-label,
.dropdown.dd-b .dd-toggle-label:before {
  border: 1px solid var(--sand6);
}
.quick-settings-region__dropdown .dd-list {
  background-color: var(--sand3) !important;
  color: var(--color-primary) !important;
}
.quick-settings-region__dropdown .dd-list li.--hover,
.quick-settings-region__dropdown .dd-list li:hover {
  background-color: var(--sand4) !important;
  color: var(--color-primary) !important;
}
.dropdown .dd-list input[type="search"] {
  background-color: var(--sand2);
  border: 1px solid var(--sand4);
}

.dropdown .dd-list li.--hover,
.dropdown .dd-list li:hover {
  color: var(--color-primary);
  background-color: var(--sand3);
}

.dropdown .dd-toggle-label {
  width: 100%;
  height: inherit;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  color: var(--color-primary);
  background-color: var(--sand4);
  border-radius: 5px;
  padding-left: 15px;
  padding-right: 15px;
}

#mm-image .custom-date-range .input label input {
  background-color: var(--sand3);
  border: 1px solid var(--sand8);
  border-radius: 8px;
}

.k_ui_toggle_switch.--enabled .k_ui_toggle_switch_bar {
  background-color: var(--color-primary);
}

.land_adv_search_btn {
  text-decoration: none;
  bottom: -4px;
  right: 0;
  transform: translateY(100%);
  background-color: unset;
  font-size: 0.875rem;
  color: var(--sand8);
}

.search-form {
  margin-left: auto;
  margin-right: auto;
}

footer {
  background-color: var(--sand4);
  border-top: 1px solid var(--sand7);
}

/* assistant beta */

.search_mode_toggle i.oSea {
  background-color: var(--sand12);
  border: 1px solid var(--sand12);
  color: var(--sand1);
  transition: ease 150ms;
}

#search_mode_toggle:checked
  + .search-form
  .search_mode_box
  .search_mode_toggle
  i.o2rb {
  background-color: var(--sand12);
  border: 1px solid var(--sand12);
  color: var(--sand1);
  transition: ease 150ms;
}

.search_mode_toggle i:hover {
  background-color: var(--sand12) !important;
  border: 1px solid var(--sand12) !important;
  color: var(--sand1) !important;
}

.search-form .search_area {
  border: none;
}

/*transitions*/
.auto_suggestions {
  transition: transform 300ms cubic-bezier(1, 0, 0, 1);
  transform: scaleY(0);
}

.ranked-box-overlay {
  position: absolute;
  z-index: 1001;
  visibility: hidden;
  opacity: 0;
  bottom: 0;
  transform: scale(0.8);
  transform-origin: left center;
  transition: opacity 300ms cubic-bezier(1, 0, 0, 1),
    transform 300ms cubic-bezier(1, 0, 0, 1),
    left 300ms cubic-bezier(1, 0, 0, 1), top 300ms cubic-bezier(1, 0, 0, 1);
}

Here's a modified version of this theme that respects the Kagi dark-mode setting (light/dark/system) instead of only the system setting:
https://gist.github.com/VapidLinus/e835b88f12f1cd07f73b03d4643d6cef/revisions#diff-b47e4ca73e8e066644fa670d7691c909d73f69ba923a37b94802d75e018d5080

The key is to use .theme_calm_blue {...} and .theme_moon_dark {...} to differentiate between the themes instead of @media (prefers-color-scheme: dark) {...}.

Here's a modified version of this theme that respects the Kagi dark-mode setting (light/dark/system) instead of only the system setting: https://gist.github.com/VapidLinus/e835b88f12f1cd07f73b03d4643d6cef/revisions#diff-b47e4ca73e8e066644fa670d7691c909d73f69ba923a37b94802d75e018d5080

The key is to use .theme_calm_blue {...} and .theme_moon_dark {...} to differentiate between the themes instead of @media (prefers-color-scheme: dark) {...}.

Thanks for this! 🙌