Recolor dark theme to blue shade (go-gitea#29283)

Now uses the same primary color as light theme. The secondary colors are
shifted towards a slightly blue shade. Could maybe desaturate a bit
more, but overall I think I'm happy with it.

Fixes: go-gitea#27097

<img width="1343" alt="Screenshot 2024-02-27 at 22 21 46"
src="https://github.com/go-gitea/gitea/assets/115237/4163c393-b469-4a53-8f4b-1c33aa04f3ac">
<img width="581" alt="image"
src="https://github.com/go-gitea/gitea/assets/115237/e621f7f8-5679-4605-bf42-3d5ff1071e1e">
<img width="581" alt="image"
src="https://github.com/go-gitea/gitea/assets/115237/20e66493-2457-482b-b8f1-e5710934e189">

---------

Co-authored-by: Giteabot <[email protected]>

Author: silverwind

web_src/css/themes/theme-gitea-dark.css

@@ -3,72 +3,72 @@
 
 :root {
   --is-dark-theme: true;
-  --color-primary: #87ab63;
+  --color-primary: #4183c4;
   --color-primary-contrast: #ffffff;
-  --color-primary-dark-1: #93b373;
-  --color-primary-dark-2: #9fbc82;
-  --color-primary-dark-3: #abc492;
-  --color-primary-dark-4: #b7cda1;
-  --color-primary-dark-5: #cfddc1;
-  --color-primary-dark-6: #e7eee0;
-  --color-primary-dark-7: #f8faf6;
-  --color-primary-light-1: #7a9e55;
-  --color-primary-light-2: #6c8c4c;
-  --color-primary-light-3: #5f7b42;
-  --color-primary-light-4: #516939;
-  --color-primary-light-5: #364626;
-  --color-primary-light-6: #1b2313;
-  --color-primary-light-7: #080b06;
-  --color-primary-alpha-10: #87ab6319;
-  --color-primary-alpha-20: #87ab6333;
-  --color-primary-alpha-30: #87ab634b;
-  --color-primary-alpha-40: #87ab6366;
-  --color-primary-alpha-50: #87ab6380;
-  --color-primary-alpha-60: #87ab6399;
-  --color-primary-alpha-70: #87ab63b3;
-  --color-primary-alpha-80: #87ab63cc;
-  --color-primary-alpha-90: #87ab63e1;
+  --color-primary-dark-1: #548fca;
+  --color-primary-dark-2: #679cd0;
+  --color-primary-dark-3: #7aa8d6;
+  --color-primary-dark-4: #8db5dc;
+  --color-primary-dark-5: #b3cde7;
+  --color-primary-dark-6: #d9e6f3;
+  --color-primary-dark-7: #f4f8fb;
+  --color-primary-light-1: #3876b3;
+  --color-primary-light-2: #31699f;
+  --color-primary-light-3: #2b5c8b;
+  --color-primary-light-4: #254f77;
+  --color-primary-light-5: #193450;
+  --color-primary-light-6: #0c1a28;
+  --color-primary-light-7: #04080c;
+  --color-primary-alpha-10: #4183c419;
+  --color-primary-alpha-20: #4183c433;
+  --color-primary-alpha-30: #4183c44b;
+  --color-primary-alpha-40: #4183c466;
+  --color-primary-alpha-50: #4183c480;
+  --color-primary-alpha-60: #4183c499;
+  --color-primary-alpha-70: #4183c4b3;
+  --color-primary-alpha-80: #4183c4cc;
+  --color-primary-alpha-90: #4183c4e1;
   --color-primary-hover: var(--color-primary-light-1);
   --color-primary-active: var(--color-primary-light-2);
-  --color-secondary: #525767;
-  --color-secondary-dark-1: #5c6374;
-  --color-secondary-dark-2: #666e81;
-  --color-secondary-dark-3: #7c8497;
-  --color-secondary-dark-4: #8990a1;
-  --color-secondary-dark-5: #959cab;
-  --color-secondary-dark-6: #a2a8b5;
-  --color-secondary-dark-7: #afb4c0;
-  --color-secondary-dark-8: #bcc0ca;
-  --color-secondary-dark-9: #c9cbd4;
-  --color-secondary-dark-10: #d6d7de;
-  --color-secondary-dark-11: #e2e3e8;
-  --color-secondary-dark-12: #eeeff2;
-  --color-secondary-dark-13: #fbfbfc;
-  --color-secondary-light-1: #454a57;
-  --color-secondary-light-2: #383c47;
-  --color-secondary-light-3: #2c2f37;
-  --color-secondary-light-4: #1f2226;
-  --color-secondary-alpha-10: #52576719;
-  --color-secondary-alpha-20: #52576733;
-  --color-secondary-alpha-30: #5257674b;
-  --color-secondary-alpha-40: #52576766;
-  --color-secondary-alpha-50: #52576780;
-  --color-secondary-alpha-60: #52576799;
-  --color-secondary-alpha-70: #525767b3;
-  --color-secondary-alpha-80: #525767cc;
-  --color-secondary-alpha-90: #525767e1;
+  --color-secondary: #3f4346;
+  --color-secondary-dark-1: #464a4d;
+  --color-secondary-dark-2: #4f5356;
+  --color-secondary-dark-3: #5f6366;
+  --color-secondary-dark-4: #72767a;
+  --color-secondary-dark-5: #7f8488;
+  --color-secondary-dark-6: #8d9297;
+  --color-secondary-dark-7: #999ea3;
+  --color-secondary-dark-8: #a6abaf;
+  --color-secondary-dark-9: #aeb3b8;
+  --color-secondary-dark-10: #babfc4;
+  --color-secondary-dark-11: #c5cbd0;
+  --color-secondary-dark-12: #ced4da;
+  --color-secondary-dark-13: #d1d7dd;
+  --color-secondary-light-1: #313538;
+  --color-secondary-light-2: #272b2e;
+  --color-secondary-light-3: #1e2225;
+  --color-secondary-light-4: #171b1e;
+  --color-secondary-alpha-10: #3f434619;
+  --color-secondary-alpha-20: #3f434633;
+  --color-secondary-alpha-30: #3f43464b;
+  --color-secondary-alpha-40: #3f434666;
+  --color-secondary-alpha-50: #3f434680;
+  --color-secondary-alpha-60: #3f434699;
+  --color-secondary-alpha-70: #3f4346b3;
+  --color-secondary-alpha-80: #3f4346cc;
+  --color-secondary-alpha-90: #3f4346e1;
   --color-secondary-button: var(--color-secondary-dark-4);
   --color-secondary-hover: var(--color-secondary-dark-3);
   --color-secondary-active: var(--color-secondary-dark-2);
   /* console colors - used for actions console and console files */
-  --color-console-fg: #eeeff2;
-  --color-console-fg-subtle: #959cab;
-  --color-console-bg: #262936;
-  --color-console-border: #383c47;
+  --color-console-fg: #ced4da;
+  --color-console-fg-subtle: #7f8488;
+  --color-console-bg: #1c2023;
+  --color-console-border: #272b2e;
   --color-console-hover-bg: #ffffff16;
-  --color-console-active-bg: #454a57;
-  --color-console-menu-bg: #383c47;
-  --color-console-menu-border: #5c6374;
+  --color-console-active-bg: #313538;
+  --color-console-menu-bg: #272b2e;
+  --color-console-menu-border: #464a4d;
   /* named colors */
   --color-red: #cc4848;
   --color-orange: #cc580c;
@@ -81,7 +81,7 @@
   --color-purple: #b259d0;
   --color-pink: #d22e8b;
   --color-brown: #a47252;
-  --color-black: #2e323e;
+  --color-black: #1f2326;
   /* light variants - produced via Sass scale-color(color, $lightness: +10%) */
   --color-red-light: #d15a5a;
   --color-orange-light: #f6a066;
@@ -94,7 +94,7 @@
   --color-purple-light: #ba6ad5;
   --color-pink-light: #d74397;
   --color-brown-light: #b08061;
-  --color-black-light: #3f4555;
+  --color-black-light: #46494d;
   /* dark 1 variants - produced via Sass scale-color(color, $lightness: -10%) */
   --color-red-dark-1: #c23636;
   --color-orange-dark-1: #f38236;
@@ -107,7 +107,7 @@
   --color-purple-dark-1: #a742c9;
   --color-pink-dark-1: #be297d;
   --color-brown-dark-1: #94674a;
-  --color-black-dark-1: #292d38;
+  --color-black-dark-1: #2c2f35;
   /* dark 2 variants - produced via Sass scale-color(color, $lightness: -20%) */
   --color-red-dark-2: #ad3030;
   --color-orange-dark-2: #f16e17;
@@ -120,7 +120,7 @@
   --color-purple-dark-2: #9834b9;
   --color-pink-dark-2: #a9246f;
   --color-brown-dark-2: #835b42;
-  --color-black-dark-2: #252832;
+  --color-black-dark-2: #292a2e;
   /* ansi colors used for actions console and console files */
   --color-ansi-black: var(--color-black);
   --color-ansi-red: var(--color-red);
@@ -139,8 +139,8 @@
   --color-ansi-bright-cyan: var(--color-teal-light);
   --color-ansi-bright-white: var(--color-console-fg);
   /* other colors */
-  --color-grey: #505665;
-  --color-grey-light: #a1a6b7;
+  --color-grey: #3c4043;
+  --color-grey-light: #898e92;
   --color-gold: #b1983b;
   --color-white: #ffffff;
   --color-diff-removed-word-bg: #6f3333;
@@ -151,7 +151,7 @@
   --color-diff-removed-row-border: #634343;
   --color-diff-moved-row-border: #bcca6f;
   --color-diff-added-row-border: #314a37;
-  --color-diff-inactive: #353846;
+  --color-diff-inactive: #24282b;
   --color-error-border: #a04141;
   --color-error-bg: #522;
   --color-error-bg-active: #744;
@@ -180,40 +180,40 @@
   --color-orange-badge-hover-bg: #f2711c4d;
   --color-git: #f05133;
   /* target-based colors */
-  --color-body: #2e323e;
-  --color-box-header: #303340;
-  --color-box-body: #222733;
-  --color-box-body-highlight: #262b36;
-  --color-text-dark: #dbe0ea;
-  --color-text: #cbd0da;
-  --color-text-light: #bbbfca;
-  --color-text-light-1: #aaafb9;
-  --color-text-light-2: #9a9ea9;
-  --color-text-light-3: #8a8e99;
-  --color-footer: #232834;
-  --color-timeline: #4c525e;
-  --color-input-text: #dfe3ec;
-  --color-input-background: #1e252e;
-  --color-input-toggle-background: #454a57;
+  --color-body: #1f2326;
+  --color-box-header: #202427;
+  --color-box-body: #191d20;
+  --color-box-body-highlight: #1d2124;
+  --color-text-dark: #c4cace;
+  --color-text: #babfc3;
+  --color-text-light: #a8acb0;
+  --color-text-light-1: #9ca0a5;
+  --color-text-light-2: #8f9397;
+  --color-text-light-3: #828689;
+  --color-footer: #1b1f22;
+  --color-timeline: #383c3f;
+  --color-input-text: #c7ccd1;
+  --color-input-background: #161a1d;
+  --color-input-toggle-background: #313538;
   --color-input-border: var(--color-secondary);
   --color-input-border-hover: var(--color-secondary-dark-1);
-  --color-header-wrapper: #202430;
+  --color-header-wrapper: #191d20;
   --color-light: #00000028;
   --color-light-mimic-enabled: rgba(0, 0, 0, calc(40 / 255 * 222 / 255 / var(--opacity-disabled)));
   --color-light-border: #ffffff28;
   --color-hover: #ffffff19;
   --color-active: #ffffff24;
-  --color-menu: #1e252e;
-  --color-card: #1e252e;
+  --color-menu: #161a1d;
+  --color-card: #161a1d;
   --color-markup-table-row: #ffffff06;
   --color-markup-code-block: #ffffff16;
-  --color-button: #1e252e;
-  --color-code-bg: #222733;
-  --color-code-sidebar-bg: #232834;
+  --color-button: #161a1d;
+  --color-code-bg: #191d20;
+  --color-code-sidebar-bg: #1b1f22;
   --color-shadow: #00000058;
-  --color-secondary-bg: #2a2e3a;
-  --color-expand-button: #3c404d;
-  --color-placeholder-text: #8a8e99;
+  --color-secondary-bg: #2f3135;
+  --color-expand-button: #414348;
+  --color-placeholder-text: #777b7f;
   --color-editor-line-highlight: var(--color-primary-light-5);
   --color-project-board-bg: var(--color-secondary-light-2);
   --color-project-board-dark-label: #111111;
@@ -224,13 +224,13 @@
   --color-reaction-active-bg: var(--color-primary-light-5);
   --color-tooltip-text: #ffffff;
   --color-tooltip-bg: #000000f0;
-  --color-nav-bg: #232834;
-  --color-nav-hover-bg: #383c47;
+  --color-nav-bg: #1b1f22;
+  --color-nav-hover-bg: #272b2e;
   --color-nav-text: var(--color-text);
-  --color-label-text: #dfe3ec;
-  --color-label-bg: #7c84974b;
-  --color-label-hover-bg: #7c8497a0;
-  --color-label-active-bg: #7c8497ff;
+  --color-label-text: #ced2d7;
+  --color-label-bg: #7a7f834b;
+  --color-label-hover-bg: #7a7f83a0;
+  --color-label-active-bg: #7a7f83ff;
   --color-accent: var(--color-primary-light-1);
   --color-small-accent: var(--color-primary-light-5);
   --color-active-line: #534d1b;