@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,300;0,400;0,500;0,700;1,300;1,400;1,500;1,700&display=swap');

:root {

  /* background color | --bg-[background type]: value */
  --bg-surface: #FFFFFF;
  --bg-surface-transparent: #FFFFFF00;
  --bg-surface-low: #F6F6F6;
  --bg-surface-low-transparent: #F6F6F600;
  --bg-surface-hover: rgba(0, 0, 0, 3%);
  --bg-surface-active: rgba(0, 0, 0, 5%);
  --bg-surface-border: rgba(0, 0, 0, 6%);

  --bg-primary: rgb(83, 110, 234);
  --bg-primary-hover: rgba(83, 110, 234, 80%);
  --bg-primary-active: rgba(83, 110, 234, 70%);
  --bg-primary-border: rgba(83, 110, 234, 38%);

  --bg-positive: rgb(69, 184, 59);
  --bg-positive-hover: rgba(69, 184, 59, 8%);
  --bg-positive-active: rgba(69, 184, 59, 15%);
  --bg-positive-border: rgba(69, 184, 59, 40%);
  
  --bg-caution: rgb(255, 179, 0);
  --bg-caution-hover: rgba(255, 179, 0, 8%);
  --bg-caution-active: rgba(255, 179, 0, 15%);
  --bg-caution-border: rgba(255, 179, 0, 40%);

  --bg-danger: rgb(240, 71, 71);
  --bg-danger-hover: rgba(240, 71, 71, 5%);
  --bg-danger-active: rgba(240, 71, 71, 10%);
  --bg-danger-border: rgba(240, 71, 71, 20%);

  --bg-tooltip: #353535;
  --bg-badge: #989898;

  /* text color | --tc-[background type]-[priority]: value */
  --tc-surface-high: #000000;
  --tc-surface-normal: rgba(0, 0, 0, 68%);
  --tc-surface-normal-low: rgba(0, 0, 0, 60%);
  --tc-surface-low: rgba(0, 0, 0, 38%);
  
  --tc-primary-high: #ffffff;
  --tc-primary-normal: rgba(255, 255, 255, 68%);
  --tc-primary-low: rgba(255, 255, 255, 40%);
  
  --tc-positive-high: var(--bg-positive);
  --tc-positive-normal: rgb(69, 184, 59, 80%);
  --tc-positive-low: rgb(69, 184, 59, 60%);

  --tc-caution-high: var(--bg-caution);
  --tc-caution-normal: rgb(255, 179, 0, 80%);
  --tc-caution-low: rgb(255, 179, 0, 60%);
  
  --tc-danger-high: var(--bg-danger);
  --tc-danger-normal: rgba(240, 71, 71, 88%);
  --tc-danger-low: rgba(240, 71, 71, 60%);

  --tc-code: #e62498;
  --tc-link: hsl(213deg 76% 56%);
  --tc-tooltip: white;
  --tc-badge: white;


  /* system icons | --ic-[background type]-[priority]: value */
  --ic-surface-normal: #626262;
  --ic-primary-normal: #ffffff;
  --ic-positive-normal: rgba(69, 184, 59, 80%);
  --ic-caution-normal: rgba(255, 179, 0, 80%);
  --ic-danger-normal: rgba(240, 71, 71, 0.7);


  /* system icon size | -ic-[size]: value */
  --ic-large: 38px;
  --ic-normal: 24px;
  --ic-small: 20px;
  --ic-extra-small: 18px;

  /* avatar size */
  --av-large: 80px;
  --av-normal: 42px;
  --av-small: 36px;
  --av-extra-small: 24px;


  /* shadow and overlay */
  --bg-overlay: rgba(0, 0, 0, 20%);

  --bs-popup: 0 0 16px rgba(0, 0, 0, 10%);

  --bs-surface-border: inset 0 0 0 1px var(--bg-surface-border);
  --bs-surface-outline: 0 0 0 2px var(--bg-surface-border);

  --bs-primary-border: inset 0 0 0 1px var(--bg-primary-border);
  --bs-primary-outline: 0 0 0 2px var(--bg-primary-border);

  --bs-positive-border: inset 0 0 0 1px var(--bg-positive-border);
  --bs-positive-outline: 0 0 0 2px var(--bg-positive-border);

  --bs-caution-border: inset 0 0 0 1px var(--bg-caution-border);
  --bs-caution-outline: 0 0 0 2px var(--bg-caution-border);

  --bs-danger-border: inset 0 0 0 1px var(--bg-danger-border);
  --bs-danger-outline: 0 0 0 2px var(--bg-danger-border);


  /* border */
  --bo-radius: 8px;


  /* font syles */
  --fs-h1: 36px;
  --ls-h1: -1.5px;
  --lh-h1: 38px;

  --fs-h2: 24px;
  --ls-h2: -0.5px;
  --lh-h2: 30px;

  --fs-s1: 18px;
  --ls-s1: -0.2px;
  --lh-s1: 24px;

  --fs-b1: 16px;
  --ls-b1: 0.1px;
  --lh-b1: 24px;

  --fs-b2: 14px;
  --ls-b2: 0.2px;
  --lh-b2: 20px;

  --fs-b3: 12px;
  --ls-b3: 0px;
  --lh-b3: 16px;


  /* spacing | --sp-[space]: value */
  --sp-none: 0px;
  --sp-ultra-tight: 4px;
  --sp-extra-tight: 8px;
  --sp-tight: 12px;
  --sp-normal: 16px;
  --sp-loose: 20px;
  --sp-extra-loose: 32px;


  /* other */
  --border-width: 1px;

  --font-family: 'Roboto', 'Supreme', sans-serif;
}

.silver-theme {
  /* background color | --bg-[background type]: value */
  --bg-surface: hsl(0, 0%, 95%);
  --bg-surface-transparent: hsla(0, 0%, 95%, 0);
  --bg-surface-low: hsl(0, 0%, 91%);
  --bg-surface-low-transparent: hsla(0, 0%, 91%, 0);
}

.dark-theme,
.butter-theme {
  /* background color | --bg-[background type]: value */
  --bg-surface: hsl(208, 8%, 20%);
  --bg-surface-transparent: hsla(208, 8%, 20%, 0);
  --bg-surface-low: hsl(208, 8%, 16%);
  --bg-surface-low-transparent: hsla(208, 8%, 16%, 0);
  --bg-surface-hover: rgba(255, 255, 255, 3%);
  --bg-surface-active: rgba(255, 255, 255, 5%);
  --bg-surface-border: rgba(0, 0, 0, 20%);

  --bg-primary: rgb(42, 98, 166);
  --bg-primary-hover: rgba(42, 98, 166, 80%);
  --bg-primary-active: rgba(42, 98, 166, 70%);
  --bg-primary-border: rgba(42, 98, 166, 38%);

  --bg-tooltip: #000;
  --bg-badge: hsl(0, 0%, 75%);

  /* text color | --tc-[background type]-[priority]: value */
  --tc-surface-high: rgba(255, 255, 255, 98%);
  --tc-surface-normal: rgba(255, 255, 255, 84%);
  --tc-surface-normal-low: rgba(255, 255, 255, 60%);
  --tc-surface-low: rgba(255, 255, 255, 48%);
  
  --tc-primary-high: #ffffff;
  --tc-primary-normal: rgba(255, 255, 255, 0.68);
  --tc-primary-low: rgba(255, 255, 255, 0.4);

  --tc-code: #e565b1;
  --tc-link: hsl(213deg 94% 73%);
  --tc-badge: black;

  /* system icons | --ic-[background type]-[priority]: value */
  --ic-surface-normal: rgba(255, 255, 255, 68%);
  --ic-primary-normal: #ffffff;
  
  /* shadow and overlay */
  --bg-overlay: rgba(0, 0, 0, 50%);

  --bs-popup: 0 0 16px rgba(0, 0, 0, 25%);

  --bs-surface-border: inset 0 0 0 1px var(--bg-surface-border);
  --bs-surface-outline: 0 0 0 2px var(--bg-surface-border);

  --bs-primary-border: inset 0 0 0 1px var(--bg-primary-border);
  --bs-primary-outline: 0 0 0 2px var(--bg-primary-border);

  --font-family: 'Supreme', 'Roboto', sans-serif;
}

.butter-theme {
  /* background color | --bg-[background type]: value */
  --bg-surface: hsl(64, 6%, 14%);
  --bg-surface-transparent: hsla(64, 6%, 14%, 0);
  --bg-surface-low: hsl(64, 6%, 10%);
  --bg-surface-low-transparent: hsla(64, 6%, 14%, 0);

  --bg-badge: #c4c1ab;

  
  /* text color | --tc-[background type]-[priority]: value */
  --tc-surface-high: rgb(255, 251, 222, 94%);
  --tc-surface-normal: rgba(255, 251, 222, 74%);
  --tc-surface-normal-low: rgba(255, 251, 222, 60%); 
  --tc-surface-low: rgba(255, 251, 222, 38%);


  /* system icons | --ic-[background type]-[priority]: value */
  --ic-surface-normal: rgb(255 251 222 / 68%);
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  font-size: 16px;
  background-color: var(--bg-surface);
  scroll-behavior: smooth;
}

*, *::before, *::after {
  box-sizing: border-box;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  -webkit-tap-highlight-color: transparent;
}
a {
  color: var(--tc-link);
  text-decoration: none;
}
b {
  font-weight: 500;
}
label {
  margin: 0;
  padding: 0;
}
button,
textarea {
  margin: 0;
  padding: 0;
  background-color: transparent;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
  letter-spacing: inherit;
  border: none;
}
button {
  max-width: 100%;
  text-transform: none;
  text-align: inherit;
  overflow: visible;
  -webkit-appearance: button;
}
textarea {
  color: inherit;
  word-spacing: inherit;
}
.noselect {
  -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Safari */
     -khtml-user-select: none; /* Konqueror HTML */
       -moz-user-select: none; /* Old versions of Firefox */
        -ms-user-select: none; /* Internet Explorer/Edge */
            user-select: none; /* Non-prefixed version, currently
                                  supported by Chrome, Edge, Opera and Firefox */
}

.text-h1,
.text-h2,
.text-s1,
.text-b1,
.text-b2,
.text-b3 {
  margin: 0;
  padding: 0;
  color: var(--tc-surface-high);
}

.text-h1 {
  font-size: var(--fs-h1);
  font-weight: 500;
  letter-spacing: var(--ls-h1);
  line-height: var(--lh-h1);
}
.text-h2 {
  font-size: var(--fs-h2);
  font-weight: 500;
  letter-spacing: var(--ls-h2);
  line-height: var(--lh-h2);
}
.text-s1 {
  font-size: var(--fs-s1);
  font-weight: 400;
  letter-spacing: var(--ls-s1);
  line-height: var(--lh-s1);
}
.text-b1 {
  color: var(--tc-surface-normal);
  font-size: var(--fs-b1);
  font-weight: 400;
  letter-spacing: var(--ls-b1);
  line-height: var(--lh-b1);
}
.text-b2 {
  color: var(--tc-surface-normal);
  font-size: var(--fs-b2);
  font-weight: 400;
  letter-spacing: var(--ls-b2);
  line-height: var(--lh-b2);
}
.text-b3 {
  color: var(--tc-surface-low);
  font-size: var(--fs-b3);
  font-weight: 400;
  letter-spacing: var(--ls-b3);
  line-height: var(--lh-b3);
}