Consolidate more CSS rules, fix inline code on arc-green (#21260)

- Consolidate various CSS rules into base rules
- Fix inline code in Markdown not having enough contrast on arc-green

Adds one new color variable, `--color-label-active-bg` for the
background of active labels.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/less/_base.less

@@ -158,6 +158,7 @@
   --color-tooltip-bg: #000000f0;
   --color-tooltip-text: #ffffff;
   --color-header-bar: #ffffff;
+  --color-label-active-bg: #d0d0d0;
   /* backgrounds */
   --checkbox-mask-checked: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="-1 -1 18 18" width="16" height="16"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg>');
   --checkbox-mask-indeterminate: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16"><path fill-rule="evenodd" d="M2 7.75A.75.75 0 012.75 7h10a.75.75 0 010 1.5h-10A.75.75 0 012 7.75z"></path></svg>');
@@ -393,6 +394,12 @@ a.commit-statuses-trigger {
   background: var(--color-grey);
 }
 
+.ui.active.label {
+  background: var(--color-label-active-bg);
+  border-color: var(--color-label-active-bg);
+  color: var(--color-text-dark);
+}
+
 .ui.link.menu .item:hover,
 .ui.menu .dropdown.item:hover,
 .ui.menu .link.item:hover,
@@ -478,11 +485,21 @@ a.commit-statuses-trigger {
   color: var(--color-text-light-2);
 }
 
+.ui.list .list > .item .header,
+.ui.list > .item .header {
+  color: var(--color-text-dark);
+}
+
 .ui.list .list > .item > .content,
 .ui.list > .item > .content {
   color: var(--color-text);
 }
 
+.ui.list .list > .item .description,
+.ui.list > .item .description {
+  color: var(--color-text);
+}
+
 .ui.secondary.menu .dropdown.item:hover,
 .ui.secondary.menu .link.item:hover,
 .ui.secondary.menu a.item:hover {
@@ -704,6 +721,12 @@ a.ui.card:hover,
   border-top-color: var(--color-secondary-alpha-50);
 }
 
+.ui.ui.ui.ui.table tr.active,
+.ui.ui.table td.active {
+  color: var(--color-text);
+  background: var(--color-active);
+}
+
 .ui.ui.selectable.table > tbody > tr:hover,
 .ui.table tbody tr td.selectable:hover {
   color: var(--color-text);
@@ -726,11 +749,22 @@ a.ui.card:hover,
 }
 
 .ui.modal > .header {
+  color: var(--color-text-dark);
+  background: var(--color-secondary-bg);
   border-color: var(--color-secondary);
   border-top-left-radius: var(--border-radius);
   border-top-right-radius: var(--border-radius);
 }
 
+.ui.modal > .content {
+  background: var(--color-body);
+}
+
+.ui.modal > .actions {
+  background: var(--color-secondary-bg);
+  border-color: var(--color-secondary);
+}
+
 .ui.modal > .close.inside,
 .ui.fullscreen.modal > .close {
   top: 11px; /* align modal close icon, for example admin notices */
@@ -1591,6 +1625,7 @@ i.icon.centerlock {
 .ui.labels a.label:hover,
 a.ui.label:hover {
   background: var(--color-hover);
+  border-color: var(--color-hover);
   color: var(--color-text);
 }
 
@@ -1615,7 +1650,7 @@ a.ui.label:hover {
   padding-left: 10px;
   padding-right: 10px;
   text-align: right !important;
-  color: rgba(27, 31, 35, .3);
+  color: var(--color-text-light-1);
   width: 1%;
   font-family: var(--fonts-monospace);
 

web_src/less/themes/theme-arc-green.less

@@ -118,7 +118,7 @@
   --color-menu: #2e323e;
   --color-card: #2e323e;
   --color-markup-table-row: #ffffff06;
-  --color-markup-code-block: #292d39;
+  --color-markup-code-block: #ffffff0d;
   --color-button: #353846;
   --color-code-bg: #2a2e3a;
   --color-code-sidebar-bg: #2e323e;
@@ -133,6 +133,7 @@
   --color-reaction-bg: #ffffff12;
   --color-reaction-active-bg: var(--color-primary-alpha-40);
   --color-header-bar: #2e323e;
+  --color-label-active-bg: #4c525e;
 }
 
 ::-webkit-calendar-picker-indicator {
@@ -228,11 +229,6 @@ a.ui.basic.green.label:hover {
   background-color: #a0cc75;
 }
 
-.repository .navbar .active.item,
-.repository .navbar .active.item:hover {
-  border-color: transparent !important;
-}
-
 .repository .diff-stats li {
   border-color: var(--color-secondary);
 }
@@ -247,37 +243,11 @@ a.ui.basic.green.label:hover {
   background-color: #984646;
 }
 
-.ui.list .list > .item .header,
-.ui.list > .item .header {
-  color: #dedede;
-}
-
-.ui.list .list > .item .description,
-.ui.list > .item .description {
-  color: var(--color-secondary-dark-6);
-}
-
-.lines-num {
-  color: var(--color-secondary-dark-6) !important;
-  border-color: var(--color-secondary) !important;
-}
-
 .lines-code.active,
 .lines-code .active {
   background: #534d1b !important;
 }
 
-.ui.ui.ui.ui.table tr.active,
-.ui.ui.table td.active {
-  color: #dbdbdb;
-}
-
-.ui.active.label {
-  background: #393d4a;
-  border-color: #393d4a;
-  color: #dbdbdb;
-}
-
 .ui.header .sub.header {
   color: var(--color-secondary-dark-6);
 }
@@ -286,20 +256,6 @@ a.ui.basic.green.label:hover {
   border-bottom: 1px solid var(--color-secondary);
 }
 
-.ui.modal > .header {
-  background: var(--color-secondary);
-  color: #dbdbdb;
-}
-
-.ui.modal > .actions {
-  background: var(--color-secondary);
-  border-color: var(--color-secondary);
-}
-
-.ui.modal > .content {
-  background: #383c4a;
-}
-
 .minicolors-panel {
   background: var(--color-secondary) !important;
   border-color: #6a737d !important;