diff --git a/components.d.ts b/components.d.ts
index ae1710f0..2750ce66 100644
--- a/components.d.ts
+++ b/components.d.ts
@@ -21,16 +21,21 @@ declare module '@vue/runtime-core' {
     Bip39Generator: typeof import('./src/tools/bip39-generator/bip39-generator.vue')['default']
     CaseConverter: typeof import('./src/tools/case-converter/case-converter.vue')['default']
     CButton: typeof import('./src/ui/c-button/c-button.vue')['default']
+    'CButton.demo': typeof import('./src/ui/c-button/c-button.demo.vue')['default']
     CCard: typeof import('./src/ui/c-card/c-card.vue')['default']
+    'CCard.demo': typeof import('./src/ui/c-card/c-card.demo.vue')['default']
     ChmodCalculator: typeof import('./src/tools/chmod-calculator/chmod-calculator.vue')['default']
     Chronometer: typeof import('./src/tools/chronometer/chronometer.vue')['default']
     CLink: typeof import('./src/ui/c-link/c-link.vue')['default']
+    'CLink.demo': typeof import('./src/ui/c-link/c-link.demo.vue')['default']
     CollapsibleToolMenu: typeof import('./src/components/CollapsibleToolMenu.vue')['default']
     ColorConverter: typeof import('./src/tools/color-converter/color-converter.vue')['default']
     ColoredCard: typeof import('./src/components/ColoredCard.vue')['default']
     CopyableIpLike: typeof import('./src/tools/ipv4-subnet-calculator/copyable-ip-like.vue')['default']
     CrontabGenerator: typeof import('./src/tools/crontab-generator/crontab-generator.vue')['default']
     DateTimeConverter: typeof import('./src/tools/date-time-converter/date-time-converter.vue')['default']
+    'Demo.routes': typeof import('./src/ui/demo/demo.routes.vue')['default']
+    DemoWrapper: typeof import('./src/ui/demo/demo-wrapper.vue')['default']
     DeviceInformation: typeof import('./src/tools/device-information/device-information.vue')['default']
     DiffViewer: typeof import('./src/tools/json-diff/diff-viewer/diff-viewer.vue')['default']
     DockerRunToDockerComposeConverter: typeof import('./src/tools/docker-run-to-docker-compose-converter/docker-run-to-docker-compose-converter.vue')['default']
diff --git a/src/config.ts b/src/config.ts
index c0545f6a..2558d038 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -23,9 +23,9 @@ export const config = figue({
     env: {
       doc: 'Application current env',
       format: 'enum',
-      values: ['production', 'development', 'test'],
+      values: ['production', 'development', 'preview', 'test'],
       default: 'development',
-      env: 'MODE',
+      env: 'VITE_VERCEL_ENV',
     },
   },
   plausible: {
diff --git a/src/router.ts b/src/router.ts
index f16b418c..00c20c74 100644
--- a/src/router.ts
+++ b/src/router.ts
@@ -4,6 +4,7 @@ import HomePage from './pages/Home.page.vue';
 import NotFound from './pages/404.page.vue';
 import { tools } from './tools';
 import { config } from './config';
+import { routes as demoRoutes } from './ui/demo/demo.routes';
 
 const toolsRoutes = tools.map(({ path, name, component, ...config }) => ({
   path,
@@ -32,6 +33,7 @@ const router = createRouter({
     },
     ...toolsRoutes,
     ...toolsRedirectRoutes,
+    ...(config.app.env === 'development' ? demoRoutes : []),
     { path: '/:pathMatch(.*)*', name: 'NotFound', component: NotFound },
   ],
 });
diff --git a/src/ui/c-button/c-button.demo.vue b/src/ui/c-button/c-button.demo.vue
new file mode 100644
index 00000000..988659f5
--- /dev/null
+++ b/src/ui/c-button/c-button.demo.vue
@@ -0,0 +1,29 @@
+<template>
+  <div v-for="buttonVariant of buttonVariants" :key="buttonVariant">
+    <h2>{{ _.capitalize(buttonVariant) }}</h2>
+
+    <c-button v-for="buttonType of buttonTypes" :key="buttonType" :variant="buttonVariant" :type="buttonType" mx-1>
+      Button
+    </c-button>
+
+    <c-button
+      v-for="buttonType of buttonTypes"
+      :key="buttonType"
+      :variant="buttonVariant"
+      :type="buttonType"
+      circle
+      mx-1
+    >
+      A
+    </c-button>
+  </div>
+</template>
+
+<script lang="ts" setup>
+import _ from 'lodash';
+
+const buttonVariants = ['basic', 'text'];
+const buttonTypes = ['default', 'primary'];
+</script>
+
+<style lang="less" scoped></style>
diff --git a/src/ui/c-button/c-button.theme.ts b/src/ui/c-button/c-button.theme.ts
index 2f25e6fd..87ad89f3 100644
--- a/src/ui/c-button/c-button.theme.ts
+++ b/src/ui/c-button/c-button.theme.ts
@@ -1,240 +1,76 @@
+import { darken, lighten } from '../color/color.models';
 import { defineThemes } from '../theme/theme.models';
 import { appThemes } from '../theme/themes';
 
-export const { useTheme } = defineThemes({
-  dark: {
-    basic: {
-      default: {
-        textColor: appThemes.dark.text.baseColor,
-        backgroundColor: 'rgba(255, 255, 255, 0.08)',
-
-        hover: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: 'rgba(255, 255, 255, 0.12)',
-        },
-
-        pressed: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: 'rgba(255, 255, 255, 0.24)',
-        },
-
-        outline: {
-          color: appThemes.dark.primary.color,
-        },
-      },
-
-      primary: {
-        textColor: appThemes.dark.text.baseColor,
-        backgroundColor: appThemes.dark.primary.color,
-
-        hover: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.dark.primary.colorHover,
-        },
-
-        pressed: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.dark.primary.colorPressed,
-        },
-
-        outline: {
-          color: appThemes.dark.primary.color,
-        },
-      },
-
-      warning: {
-        textColor: appThemes.dark.text.baseColor,
-        backgroundColor: appThemes.dark.warning.color,
-
-        hover: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.dark.warning.colorHover,
-        },
-
-        pressed: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.dark.warning.colorPressed,
-        },
-
-        outline: {
-          color: appThemes.dark.warning.color,
-        },
-      },
-    },
-
-    text: {
-      default: {
-        textColor: appThemes.dark.text.baseColor,
-        backgroundColor: 'transparent',
-
-        hover: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: 'rgba(255, 255, 255, 0.12)',
-        },
-
-        pressed: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: 'rgba(255, 255, 255, 0.82)',
-        },
-
-        outline: {
-          color: appThemes.dark.primary.color,
-        },
-      },
-
-      primary: {
-        textColor: appThemes.dark.text.baseColor,
-        backgroundColor: appThemes.dark.primary.color,
-
-        hover: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.dark.primary.colorHover,
-        },
-
-        pressed: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.dark.primary.colorPressed,
-        },
-
-        outline: {
-          color: appThemes.dark.primary.color,
-        },
-      },
-
-      warning: {
-        textColor: appThemes.dark.text.baseColor,
-        backgroundColor: appThemes.dark.warning.color,
-
-        hover: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.dark.warning.colorHover,
-        },
-
-        pressed: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.dark.warning.colorPressed,
-        },
-
-        outline: {
-          color: appThemes.dark.warning.color,
-        },
-      },
-    },
-  },
-  light: {
-    basic: {
-      default: {
-        textColor: appThemes.light.text.baseColor,
-        backgroundColor: 'rgba(46, 51, 56, 0.05)',
-
-        hover: {
-          textColor: appThemes.light.text.baseColor,
-          backgroundColor: 'rgba(46, 51, 56, 0.09)',
-        },
-
-        pressed: {
-          textColor: appThemes.light.text.baseColor,
-          backgroundColor: 'rgba(46, 51, 56, 0.22)',
-        },
-
-        outline: {
-          color: appThemes.light.primary.color,
-        },
-      },
-
-      primary: {
-        textColor: appThemes.dark.text.baseColor,
-        backgroundColor: appThemes.light.primary.color,
-
-        hover: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.light.primary.colorHover,
-        },
-
-        pressed: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.light.primary.colorPressed,
-        },
-
-        outline: {
-          color: appThemes.light.primary.color,
-        },
-      },
-
-      warning: {
-        textColor: appThemes.dark.text.baseColor,
-        backgroundColor: appThemes.light.warning.color,
-
-        hover: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.light.warning.colorHover,
-        },
-
-        pressed: {
-          textColor: appThemes.dark.text.baseColor,
-          backgroundColor: appThemes.light.warning.colorPressed,
-        },
-
-        outline: {
-          color: appThemes.light.warning.color,
-        },
-      },
-    },
-    text: {
-      default: {
-        textColor: appThemes.light.text.baseColor,
-        backgroundColor: 'transparent',
-
-        hover: {
-          textColor: appThemes.light.text.baseColor,
-          backgroundColor: 'rgba(46, 51, 56, 0.09)',
-        },
-
-        pressed: {
-          textColor: appThemes.light.text.baseColor,
-          backgroundColor: 'rgba(46, 51, 56, 0.13)',
-        },
-
-        outline: {
-          color: appThemes.light.primary.color,
-        },
-      },
-      primary: {
-        textColor: appThemes.light.primary.color,
-        backgroundColor: 'transparent',
-
-        hover: {
-          textColor: appThemes.light.primary.colorHover,
-          backgroundColor: 'rgba(46, 51, 56, 0.09)',
-        },
-
-        pressed: {
-          textColor: appThemes.light.primary.colorPressed,
-          backgroundColor: 'rgba(46, 51, 56, 0.13)',
-        },
-
-        outline: {
-          color: appThemes.light.primary.color,
-        },
-      },
-      warning: {
-        textColor: appThemes.light.warning.color,
-        backgroundColor: 'transparent',
-
-        hover: {
-          textColor: appThemes.light.warning.colorHover,
-          backgroundColor: 'rgba(46, 51, 56, 0.09)',
-        },
-
-        pressed: {
-          textColor: appThemes.light.warning.colorPressed,
-          backgroundColor: 'rgba(46, 51, 56, 0.13)',
-        },
-
-        outline: {
-          color: appThemes.light.warning.color,
-        },
-      },
-    },
-  },
+const createState = ({
+  textColor,
+  backgroundColor,
+  hoverBackground,
+  hoveredTextColor = textColor,
+  pressedBackground,
+  pressedTextColor = textColor,
+}: {
+  textColor: string;
+  backgroundColor: string;
+  hoverBackground: string;
+  hoveredTextColor?: string;
+  pressedBackground: string;
+  pressedTextColor?: string;
+}) => ({
+  textColor,
+  backgroundColor,
+  hover: { textColor: hoveredTextColor, backgroundColor: hoverBackground },
+  pressed: { textColor: pressedTextColor, backgroundColor: pressedBackground },
+});
+
+const createTheme = ({ style }: { style: 'light' | 'dark' }) => {
+  const theme = appThemes[style];
+
+  return {
+    basic: {
+      default: createState({
+        textColor: theme.text.baseColor,
+        backgroundColor: theme.default.color,
+        hoverBackground: theme.default.colorHover,
+        pressedBackground: theme.default.colorPressed,
+      }),
+      primary: createState({
+        textColor: theme.primary.color,
+        backgroundColor: theme.primary.colorFaded,
+        hoverBackground: lighten(theme.primary.colorFaded, 30),
+        pressedBackground: darken(theme.primary.colorFaded, 30),
+      }),
+      warning: createState({
+        textColor: theme.text.baseColor,
+        backgroundColor: theme.warning.color,
+        hoverBackground: theme.warning.colorHover,
+        pressedBackground: theme.warning.colorPressed,
+      }),
+    },
+    text: {
+      default: createState({
+        textColor: theme.text.baseColor,
+        backgroundColor: 'transparent',
+        hoverBackground: theme.default.colorHover,
+        pressedBackground: theme.default.colorPressed,
+      }),
+      primary: createState({
+        textColor: theme.primary.color,
+        backgroundColor: 'transparent',
+        hoverBackground: theme.primary.colorFaded,
+        pressedBackground: darken(theme.primary.colorFaded, 30),
+      }),
+      warning: createState({
+        textColor: theme.text.baseColor,
+        backgroundColor: theme.warning.color,
+        hoverBackground: theme.warning.colorHover,
+        pressedBackground: theme.warning.colorPressed,
+      }),
+    },
+  };
+};
+
+export const { useTheme } = defineThemes({
+  dark: createTheme({ style: 'dark' }),
+  light: createTheme({ style: 'light' }),
 });
diff --git a/src/ui/c-button/c-button.vue b/src/ui/c-button/c-button.vue
index f52a0699..2cbc4fd4 100644
--- a/src/ui/c-button/c-button.vue
+++ b/src/ui/c-button/c-button.vue
@@ -14,6 +14,7 @@
 <script lang="ts" setup>
 import type { RouteLocationRaw } from 'vue-router';
 import { useTheme } from './c-button.theme';
+import { useAppTheme } from '../theme/themes';
 
 const props = withDefaults(
   defineProps<{
@@ -56,11 +57,11 @@ const tag = computed(() => {
   }
   return 'button';
 });
+const appTheme = useAppTheme();
 </script>
 
 <style lang="less" scoped>
 .c-button {
-  margin: 0;
   line-height: 1;
   font-family: inherit;
   font-size: inherit;
@@ -103,7 +104,7 @@ const tag = computed(() => {
   }
 
   &:focus {
-    outline: 2px solid v-bind('variantTheme.outline.color');
+    outline: 1px solid v-bind('appTheme.primary.color');
   }
 
   &.disabled {
diff --git a/src/ui/c-card/c-card.demo.vue b/src/ui/c-card/c-card.demo.vue
new file mode 100644
index 00000000..6d81ee67
--- /dev/null
+++ b/src/ui/c-card/c-card.demo.vue
@@ -0,0 +1,13 @@
+<template>
+  <div>
+    <h2>Default</h2>
+
+    <c-card title="Title">
+      Lorem ipsum, dolor sit amet consectetur adipisicing elit. Repudiandae ipsa reiciendis facilis officia nulla.
+      Laboriosam cumque molestias excepturi doloribus nulla nemo quod ratione rerum possimus. Excepturi nihil possimus
+      error itaque.
+    </c-card>
+  </div>
+</template>
+
+<script lang="ts" setup></script>
diff --git a/src/ui/c-link/c-link.demo.vue b/src/ui/c-link/c-link.demo.vue
new file mode 100644
index 00000000..a655f11f
--- /dev/null
+++ b/src/ui/c-link/c-link.demo.vue
@@ -0,0 +1,12 @@
+<template>
+  <div>
+    <h2>Default</h2>
+    <c-link mx-1> Link </c-link>
+  </div>
+</template>
+
+<script lang="ts" setup>
+import CLink from './c-link.vue';
+</script>
+
+<style lang="less" scoped></style>
diff --git a/src/ui/c-link/c-link.vue b/src/ui/c-link/c-link.vue
index df101208..a7d1b831 100644
--- a/src/ui/c-link/c-link.vue
+++ b/src/ui/c-link/c-link.vue
@@ -16,7 +16,15 @@ const props = defineProps<{
 const { href, to } = toRefs(props);
 
 const theme = useTheme();
-const tag = computed(() => (href?.value ? 'a' : RouterLink));
+const tag = computed(() => {
+  if (href?.value) {
+    return 'a';
+  }
+  if (to?.value) {
+    return RouterLink;
+  }
+  return 'span';
+});
 </script>
 
 <style lang="less" scoped>
diff --git a/src/ui/color/color.models.test.ts b/src/ui/color/color.models.test.ts
new file mode 100644
index 00000000..dc59fa87
--- /dev/null
+++ b/src/ui/color/color.models.test.ts
@@ -0,0 +1,40 @@
+import { describe, test, expect } from 'vitest';
+import { darken, lighten, setOpacity } from './color.models';
+
+describe('color models', () => {
+  describe('lighten', () => {
+    test('lightens a color', () => {
+      expect(lighten('#000000', 10)).toBe('#0a0a0a');
+      expect(lighten('#000000', 20)).toBe('#141414');
+      expect(lighten('#ffffff', 30)).toBe('#ffffff');
+    });
+
+    test('lightens a color with alpha', () => {
+      expect(lighten('#00000080', 10)).toBe('#0a0a0a80');
+      expect(lighten('#00000080', 20)).toBe('#14141480');
+      expect(lighten('#ffffff80', 30)).toBe('#ffffff80');
+    });
+  });
+
+  describe('darken', () => {
+    test('darkens a color', () => {
+      expect(darken('#ffffff', 10)).toBe('#f5f5f5');
+      expect(darken('#ffffff', 20)).toBe('#ebebeb');
+      expect(darken('#000000', 30)).toBe('#000000');
+    });
+
+    test('darkens a color with alpha', () => {
+      expect(darken('#ffffff80', 10)).toBe('#f5f5f580');
+    });
+  });
+
+  describe('setOpacity', () => {
+    test('sets the opacity of a color', () => {
+      expect(setOpacity('#000000', 0.5)).toBe('#00000080');
+    });
+
+    test('sets the opacity of a color with alpha', () => {
+      expect(setOpacity('#00000000', 0.5)).toBe('#00000080');
+    });
+  });
+});
diff --git a/src/ui/color/color.models.ts b/src/ui/color/color.models.ts
new file mode 100644
index 00000000..5b4c79b5
--- /dev/null
+++ b/src/ui/color/color.models.ts
@@ -0,0 +1,33 @@
+export { lighten, darken, setOpacity };
+
+const clampHex = (value: number) => Math.max(0, Math.min(255, Math.round(value)));
+
+function lighten(color: string, amount: number): string {
+  const alpha = color.length === 9 ? color.slice(7) : '';
+  const num = parseInt(color.slice(1, 7), 16);
+
+  const r = clampHex(((num >> 16) & 255) + amount);
+  const g = clampHex(((num >> 8) & 255) + amount);
+  const b = clampHex((num & 255) + amount);
+
+  return `#${((r << 16) | (g << 8) | b).toString(16).padStart(6, '0')}${alpha}`;
+}
+
+function darken(color: string, amount: number): string {
+  return lighten(color, -amount);
+}
+
+function setOpacity(color: string, opacity: number): string {
+  const alpha = clampHex(Math.round(opacity * 255))
+    .toString(16)
+    .padStart(2, '0');
+
+  if (color.length === 7) {
+    return `${color}${alpha}`;
+  }
+
+  if (color.length === 9) {
+    return `${color.slice(0, 7)}${alpha}`;
+  }
+  throw new Error('Invalid hex color');
+}
diff --git a/src/ui/demo/demo-wrapper.vue b/src/ui/demo/demo-wrapper.vue
new file mode 100644
index 00000000..cc16a00f
--- /dev/null
+++ b/src/ui/demo/demo-wrapper.vue
@@ -0,0 +1,33 @@
+<template>
+  <div mt-2 w-full p-8>
+    <h1>c-lib components</h1>
+
+    <div flex>
+      <div w-30 b-r b-gray b-op-10 b-r-solid pr-4>
+        <c-button
+          v-for="{ name } of demoRoutes"
+          :key="name"
+          variant="text"
+          :to="{ name }"
+          w-full
+          important:justify-start
+          :type="route.name === name ? 'primary' : 'default'"
+        >
+          {{ name }}
+        </c-button>
+      </div>
+
+      <div flex-1 pl-4>
+        <router-view />
+      </div>
+    </div>
+  </div>
+</template>
+
+<script lang="ts" setup>
+import { demoRoutes } from './demo.routes';
+
+const route = useRoute();
+</script>
+
+<style lang="less" scoped></style>
diff --git a/src/ui/demo/demo.routes.ts b/src/ui/demo/demo.routes.ts
new file mode 100644
index 00000000..0e9a9e4e
--- /dev/null
+++ b/src/ui/demo/demo.routes.ts
@@ -0,0 +1,25 @@
+import type { RouteRecordRaw } from 'vue-router';
+
+const demoPages = import.meta.glob('../*/*.demo.vue');
+
+export const demoRoutes = Object.keys(demoPages).map((path) => {
+  const [, , fileName] = path.split('/');
+  const name = fileName.split('.').shift();
+
+  console.log(path);
+
+  return {
+    path: name,
+    name,
+    component: () => import(/* @vite-ignore */ path),
+  } as RouteRecordRaw;
+});
+
+export const routes = [
+  {
+    path: '/c-lib',
+    name: 'c-lib',
+    children: demoRoutes,
+    component: () => import('./demo-wrapper.vue'),
+  },
+];
diff --git a/src/ui/theme/themes.ts b/src/ui/theme/themes.ts
index eca63dbd..18b2c8d0 100644
--- a/src/ui/theme/themes.ts
+++ b/src/ui/theme/themes.ts
@@ -3,16 +3,20 @@ import { defineThemes } from './theme.models';
 export const { themes: appThemes, useTheme: useAppTheme } = defineThemes({
   light: {
     text: {
-      baseColor: 'rgb(51, 54, 57)',
-      mutedColor: 'rgba(118, 124, 130)',
+      baseColor: '#333639',
+      mutedColor: '#767c82',
+    },
+    default: {
+      color: 'rgba(46, 51, 56, 0.05)',
+      colorHover: 'rgba(46, 51, 56, 0.09)',
+      colorPressed: 'rgba(46, 51, 56, 0.22)',
     },
-
     primary: {
       color: '#18a058',
       colorHover: '#1ea54c',
       colorPressed: '#0C7A43',
+      colorFaded: '#18a0582f',
     },
-
     warning: {
       color: '#f59e0b',
       colorHover: '#f59e0b',
@@ -33,14 +37,19 @@ export const { themes: appThemes, useTheme: useAppTheme } = defineThemes({
   },
   dark: {
     text: {
-      baseColor: 'rgba(255, 255, 255, 0.82)',
-      mutedColor: 'rgba(255, 255, 255, 0.5)',
+      baseColor: '#ffffffd1',
+      mutedColor: '#ffffff80',
+    },
+    default: {
+      color: 'rgba(255, 255, 255, 0.08)',
+      colorHover: 'rgba(255, 255, 255, 0.12)',
+      colorPressed: 'rgba(255, 255, 255, 0.24)',
     },
-
     primary: {
       color: '#1ea54c',
       colorHover: '#36AD6A',
       colorPressed: '#0C7A43',
+      colorFaded: '#18a0582f',
     },
     warning: {
       color: '#f59e0b',