* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

::selection {
  background: var(--primary-color);
  color: #fff;
}

body {
  font-family: "Roboto", sans-serif;
  font-size: 20px;

  --background: #fff;
  --secondary-background: #f4f4f8;
  --text: #000;
  --primary-color: #b55cff;
  --light-color: #fff;
  --nav-color: rgba(220, 220, 235, 0.6);

  background: var(--background);
  color: var(--text);

  transition: background-color .5s, color .5s;
}



.nav-container {
  position: sticky;
  top: 0;

  height: 100vh;
  display: flex;
  align-items: center;

  margin-top: -100vh;
  margin-left: 50px;

  pointer-events: none;
  width: 80px;

  z-index: 1;
}



nav {
  display: flex;
  flex-direction: column;

  padding: 5px;
  background: var(--secondary-background);
  border-radius: 50px;

  pointer-events: all;
}

nav a {
  display: flex;
  align-items: center;
  justify-content: center;

  width: 50px;
  height: 50px;
  margin: 10px;

  background: var(--background);
  border-radius: 50%;


  transition: .2s;
}
nav img {
  height: 28px;

  filter: brightness(0); /* Black */
}
nav .connect {
  width: 6px;
  height: 20px;

  background: var(--background);
  margin: -10px auto; /* no distance between tabs and connector */
}

nav a:hover {
  background: var(--primary-color);
}
nav a:hover img {
  filter: brightness(0) invert(1); /* White */
}

/* Shown paragraph */
nav .scroll-tab {
  background: var(--primary-color);
}
nav .scroll-img {
  filter: brightness(0) invert(1); /* white */
}

/* Only used for mobile */
nav select {
  display: none;
}
nav label {
  display: none;
}

nav .divider {
  width: 60%;
  margin: 10px auto;
  height: 1px;

  background: var(--text);
}

#home img,
#gallery img {
  filter: none; /* Primary color */
}

#home:hover img,
#gallery:hover img {
  filter: brightness(0) invert(1); /* White */
}

/* TODO: Add theme switcher */
#theme:hover {
  background: var(--text);
}
#theme:hover img {
  filter: brightness(0) invert(1); /* White */
}



section {
  margin: 0 20px;
  margin-bottom: 80px;
}

h1 {
  padding: 50px 0;
  margin: 0 40px;

  font-size: 70px;
  text-align: center;
}

/* Different colors for titles */
#caesar {
  background: -webkit-linear-gradient(35deg, #00c8ff 20%, var(--primary-color) 80%);
  background-clip: text;
  color: transparent;
}
#morse {
  background: -webkit-linear-gradient(35deg, #1ec72f 40%, #12b3df 60%);
  background-clip: text;
  color: transparent;
}
#vigenere {
  background: -webkit-linear-gradient(35deg, #eda61d 20%, #f92702 80%);
  background-clip: text;
  color: transparent;
}
#ascii {
  background: -webkit-linear-gradient(35deg, #fe1d1d 40%, #f902ac 60%);
  background-clip: text;
  color: transparent;
}

.heading {
  display: flex;
  align-items: center;
  max-width: 1000px;

  margin: 0 auto;
  margin-bottom: 30px;
  /* Padding helps to scroll the heading into view when
     clicking on a link in the nav bar */
  padding-top: 30px;
}
.heading img {
  height: 35px;
}
.heading h2 {
  margin-left: 10px; /* Distance between text and image */
}

.content {
  margin: 30px auto;
  max-width: 1000px;
  padding-left: 15px;
}

p {
  line-height: 1.5;
}

.bigger-margin {
  margin-bottom: 50px;
}



.accordion {
  background: var(--secondary-background);
  border-radius: 10px;

  margin: 20px 0;
}

.accordion input[type="checkbox"] {
  display: none; /* Expanding the accordion works by clicking on the label */
}

label {
  cursor: pointer;
}

.accordion .opened,
.accordion .closed {
  align-items: center;

  padding: 15px;

  font-weight: bold;
}

.accordion .opened {
  display: none;
}
.accordion .closed {
  display: flex;
}

.accordion .opened img,
.accordion .closed img {
  width: 30px;
}

.accordion .detail {
  display: none;
  padding: 0px 15px 30px 25px;
}
.accordion.show-code .detail {
  padding: 0;
  /* Accordion used for showing the code tutorial on mobile should use all the available space */
}

/* Showing the right contents based on the state of the accordion */
.accordion input[type="checkbox"]:checked ~ label .opened {
  display: flex;
}
.accordion input[type="checkbox"]:checked ~ label .closed {
  display: none;
}

.accordion input[type="checkbox"]:checked ~ .detail {
  display: block;
}


.accordion input[type="text"] {
  -moz-appearance: none;
  -webkit-appearance: none;

  display: block;

  padding: 10px;
  margin-top: 20px;
  width: 100%;

  font-size: inherit;
  border: none;
  border-radius: 10px;

  background: var(--background);
  color: var(--text);
}
.accordion input[type="text"]:focus {
  outline: 2px solid var(--primary-color);
}

.accordion.top-level {
  background: var(--background);

  border-top: 3px solid var(--secondary-background);
  border-bottom: 3px solid var(--secondary-background);
  border-radius: 0;
}
.accordion.top-level .opened,
.accordion.top-level .closed {
  font-size: 24px;
}

.accordion.show-code .opened,
.accordion.show-code .closed {
  font-size: 20px;
  font-weight: normal;
}


.accordion .detail .switch input[type="checkbox"] {
  display: none;
}
.accordion .detail .switch label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0px 20px;
}

.accordion .detail .switch label .checked,
.accordion .detail .switch label .unchecked {
  position: relative;

  width: 50px;
  height: 30px;

  background: var(--background);

  border-radius: 15px;
  border: 2px solid var(--text);
}
.accordion .detail .switch label .checked {
  display: none;
}

.accordion .detail .switch label .circle,
.accordion .detail .switch label .disabled-circle {
  position: absolute;
  top: 3px;
  right: 3px;

  width: 20px;
  height: 20px;

  border-radius: 50%;
  background: var(--primary-color);
}
.accordion .detail .switch label .disabled-circle {
  left: 3px;
  background: var(--text);
}

.accordion .detail .switch input[type="checkbox"]:checked ~ label .checked {
  display: block;
}
.accordion .detail .switch input[type="checkbox"]:checked ~ label .unchecked {
  display: none;
}



textarea {
  -moz-appearance: none;
  -webkit-appearance: none;
  resize: none;

  width: calc(100% - 14px);
  padding: 15px;
  padding-top: 30px;
  margin-top: 15px;
  margin-left: 7px;
  margin-right: 7px;

  font-size: inherit;
  font-family: inherit;
  color: var(--text);

  border: none;
  border-top: 2px solid var(--text);
  border-bottom: 2px solid var(--text);
  border-radius: 0;
  background: var(--secondary-background);
}

.output {
  background: var(--background);
}
.output:focus {
  outline: none;
}
.input:focus {
  outline: 2px solid var(--primary-color);
  border: none;
  padding-top: 32px;
  padding-bottom: 17px;
}

/* Describing the input with added decorations */
.input-area {
  position: relative;
  margin: 40px 0;
}

.input-area .top {
  position: absolute;
  top: 0;

  width: 100%;

  display: flex;
  justify-content: space-between;
  align-items: center;
}

.input-area .top .left {
  display: flex;
  align-items: center;

  padding: 5px 12px;

  border: 2px solid var(--text);
  border-radius: 20px;
  background: var(--background);

  font-size: 16px;
}

.input-area .top .right {
  width: 15px;
  height: 15px;

  border-radius: 8px;
  border: 2px solid var(--text);
  background: var(--background);
}

.input-area .top img {
  width: 15px;
  margin-right: 10px;
}


#overview ul {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-auto-rows: 1fr;
  gap: 40px;

  list-style-type: none;
}

#overview a {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;

  height: 100%;

  padding: 20px;

  background: var(--secondary-background);
  border-radius: 10px;
  border: 2px solid var(--secondary-background);

  transition: all .2s;
}
#overview a:hover {
  border: 2px solid var(--primary-color);
}
#overview a {
  text-decoration: none;
}

#overview .name {
  display: flex;
  align-items: center;
  justify-content: flex-start;

  margin-bottom: 20px;
  font-weight: bold;
}

#overview p {
  color: var(--text);
  /* Doesn't completely remove underline */
  text-decoration: none;
}
#overview .name p {
  margin-left: 20px;
}


#explanation p {
  margin: 30px 0;
}

#explanation .example {
  padding: 15px;

  font-family: "Roboto Mono", monospace;
  letter-spacing: 5px;

  background: var(--secondary-background);
  color: var(--text);
  border-radius: 10px;
}
/* Used for example for displaying the morse code words */
#explanation .example-flex {
  display: flex;
  flex-wrap: wrap;
}
#explanation .example-flex span {
  width: 33.3333%; /* -> 3 columns */
}
#explanation .example.more-space {
  letter-spacing: 10px;
}
#explanation .example em {
  font-style: normal;
  color: var(--primary-color);
}
#explanation #vigenere-example {
  font-size: 18px;
}
/* Showing a condensed version of the vigenere square on mobile */
#explanation #mobile-vigenere-example {
  display: none;
}

#explanation .accordion .opened,
#explanation .accordion .closed {
  justify-content: center;
  
  font-weight: normal;
  font-size: inherit;
}

#explanation .accordion .opened p,
#explanation .accordion .closed p {
  margin: 0;
  margin-left: 20px;
}

#explanation .accordion p {
  margin: 10px 0;
}



/* Currently only in use on the caesar page */
#test .key-settings {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 50px;

  margin: 20px;
  margin-left: 30px;
}
#test .key-settings em {
  font-style: normal;
  color: var(--primary-color);
}
#test .key-settings .key-label {
  display: flex;
  align-items: center;
  gap: 20px;
}
#test .key-settings input[type="text"] {
  width: 60px;
  margin-top: 0;
  text-align: center;
}
#test .select-key {
  display: flex;
  align-items: center;
}
#test .select-key button {
  -moz-appearance: none;
  -webkit-appearance: none;

  display: flex;
  align-items: center;

  padding: 10px 15px;

  box-shadow: none;
  border: none;

  background: none;
  color: var(--primary-color);

  font-size: 20px;
}
/*
Possible key input by having a slider - problem: many steps when alphabet is long

.key-settings input[type="range"] {
  -moz-appearance: none;
  -webkit-appearance: none;

  background: #fff;
  border-radius: 10px;
  height: 10px;
  width: 100%;
}

.key-settings .range-wrapper input::-moz-range-thumb {
  height: 20px;
  width: 20px;
  border-radius: 10px;
  background: var(--primary-color);
  border: none;
}
.key-settings .range-wrapper input::-webkit-slider-thumb {
  height: 20px;
  width: 20px;
  border-radius: 10px;
  background: var(--primary-color);
  border: none;
}
*/

/* Currently only used for the morse page */
#test .codeword-element {
  display: flex;
  align-items: center;
  justify-content: space-around;
}
#test .codeword-element input[type="text"] {
  margin: 10px 20px;
  font-weight: normal;
}
/* Morse code input */
#test .codeword-element input[type="text"]:first-of-type {
  letter-spacing: 2px;
}
#test .codeword-element.duplicate input[type="text"] {
  color: #a41c1c;
}
/* Delete button */
#test #list-wrapper button {
  -moz-appearance: none;
  -webkit-appearance: none;

  padding: 10px;

  border-radius: 10px;
  border: none;
  outline: none;
  background: var(--background);

  transition: background .2s;
}
#test #list-wrapper button:hover {
  background: #a41c1c;
}
#test #list-wrapper button:hover img {
  filter: brightness(0) invert(1); /* White */
}
#test #list-wrapper {
  margin-top: 30px;
}
#test .codeword-button {
  -moz-appearance: none;
  -webkit-appearance: none;

  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;

  width: 250px;

  padding: 10px;
  margin: 0 auto;
  margin-top: 30px;

  border-radius: 10px;
  border: none;
  outline: none;

  background: var(--background);
  color: var(--text);

  font-size: 18px;

  transition: color .2s, background .2s;
}
#test .codeword-button:hover {
  background: var(--primary-color);
  color: var(--light-color);
}
#test .codeword-button:hover img {
  filter: brightness(0) invert(1); /* White */
}

#test .direction-select {
  display: flex;
  align-items: center;
  justify-content: center;

  margin: 60px 0;
}
#test .direction-select input[type="radio"] {
  display: none;
}


#test #encrypt-label,
#test #decrypt-label {
  position: relative;

  display: flex;
  align-items: center;
  justify-content: center;

  width: 250px;
  padding: 15px;
  margin: 0 20px;

  background: var(--secondary-background);
  border: 2px solid var(--secondary-background);
  border-radius: 10px;
}

#test #encrypt-label img:last-of-type,
#test #decrypt-label img:last-of-type {
  margin-right: 10px;
  filter: brightness(0); /* Black */
}

#test #encrypt-label .checked-indicator,
#test #decrypt-label .checked-indicator {
  position: absolute;
  left: 15px;

  display: none;
}

#test #encrypt:checked ~ #encrypt-label,
#test #decrypt:checked ~ #decrypt-label {
  border: 2px solid var(--primary-color);
}

#test #encrypt:checked ~ #encrypt-label .checked-indicator,
#test #decrypt:checked ~ #decrypt-label .checked-indicator {
  display: block;
}

#test .copy-button {
  -moz-appearance: none;
  -webkit-appearance: none;

  display: block;

  width: 100%;
  max-width: 300px;
  padding: 10px;
  margin: 0 auto;
  margin-bottom: 20px;

  font-size: inherit;
  color: var(--light-color);
  background: var(--primary-color);
  border-radius: 10px;
  border: 2px solid var(--primary-color);

  transition: color .2s, background .2s;
}
#test .copy-button:hover {
  color: var(--text);
  background: var(--secondary-background);
}

#test .copied {
  background: var(--secondary-background);
  border: 2px solid #5cffa2;
}
#test .error {
  background: var(--secondary-background);
  border: 2px solid #ff5c6a;
}



#code .content {
  display: flex;
}

#code .content .instructions {
  max-width: 400px;
  flex-shrink: 0;
}

#code p {
  margin-right: 20px;
  margin-bottom: 50px;
  padding: 20px;

  border-radius: 10px;
  border: 2px solid var(--secondary-background);

  cursor: pointer;
}
#code p:last-of-type {
  margin-bottom: 100vh;
}

#code .highlighted-instruction {
  border: 2px solid var(--primary-color);
}

#code .code {
  position: -webkit-sticky;
  position: sticky;
  top: 30px;

  width: calc(50vw + 60px);
  height: calc(100vh - 60px);
  overflow: scroll;

  border-radius: 10px;
  border: 3px solid var(--secondary-background);
  background: var(--background);
  padding: 10px;

  font-size: 16px;
  line-height: 2;
}

#code .code-container {
  border-radius: 10px;
  background: var(--background);
  border: 3px solid var(--secondary-background);
  padding: 10px;

  font-size: 16px;
  line-height: 2;
  margin-bottom: 20px;

  white-space: nowrap;
  overflow-x: scroll;
}

/* Line with line number */
#code .line {
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
}
/* Code with indents */
#code .complete-line {
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
}

#code .line .line-number {
  display: inline-block;

  width: 25px;
  margin-right: 10px;
  flex-shrink: 0;

  text-align: right;
  color: #aaaaaa;
}

#code .line .code-line {
  font-family: "Roboto Mono", monospace;
}

/* Various colors for special words */
#code .line .code-line .function {
  color: #57b4e9;
}
#code .line .code-line .string {
  color: #3ac852;
}
#code .line .code-line .keyword {
  color: #9c4ddf;
}
#code .line .code-line .bool {
  color: #ff4242;
}
#code .line .code-line .number {
  color: #d4830b;
}

#code .line .highlighted-line {
  color: var(--primary-color);
  font-weight: bold;
}

#code .indent {
  width: 20px;
  display: inline-block;;
}

/* Only used for mobile */
#code .mobile-instructions-container {
  display: none;
}


#analysis .frequency-statistic {
  margin: 60px 0 20px 0;
}

#analysis .frequency-statistic .statistic-wrapper {
  display: flex;
  justify-content: flex-start;
  align-items: baseline;

  width: 100%;
  overflow-x: scroll;

  padding: 10px;
  padding-top: 30px;

  border: 2px solid var(--secondary-background);
  border-radius: 10px;
}

#analysis .frequency-statistic .data {
  display: flex;
  align-items: center;
  flex-direction: column;

  position: relative;

  margin: 0 5px;
}

#analysis .frequency-statistic .data .bar {
  height: 100px;
  width: 100%;

  background: var(--primary-color);
  border-radius: 5px;
}

/* Description in bar */
#analysis .frequency-statistic .data span:first-of-type {
  position: absolute;
  top: 5px;

  color: var(--light-color);
}
/* Description on top of bar */
#analysis .frequency-statistic .data span:first-of-type.top {
  position: absolute;
  top: -25px;

  color: var(--text);
}

/* Letter under the bar */
#analysis .frequency-statistic .data span:last-of-type {
  font-family: "Roboto Mono", monospace;
  padding: 20px;
}

#analysis .frequency-statistic .statistic-wrapper .info {
  margin-top: -20px; /* Hide top padding of container when no statistic is displayed */
}



#further-reading .content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

#further-reading .content a {
  padding: 5px;
  margin: 15px 0;

  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--primary-color);
  text-decoration-thickness: 2px;

  transition: color .2s;
}
#further-reading a:hover {
  color: var(--primary-color);
}



footer {
  display: flex;
  justify-content: space-between;
  align-items: center;

  width: 100%;
  padding: 50px 50px 100px 50px;

  background: var(--secondary-background);
}

footer .first-column {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

footer .licenses-and-policy {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

footer .wpaad-footer {
  font-family: "Roboto Slab", monospace;
  font-size: 30px;
  color: #b55cff;
}

footer .authors {
  font-size: 22px;
}

footer a {
  text-decoration: none;
  color: var(--primary-color);

  transition: color .2s;
}

footer a:hover {
  color: var(--text);
}



@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

/* Mobile */
@media only screen and (max-width: 940px) {
  body {
    font-size: 18px;
  }

  p {
    line-height: 1.8;
  }

  section {
    margin-bottom: 0px;
    margin-top: -50px;
    padding-top: 50px;
  }

  h1 {
    font-size: 45px;

    margin: 0;
    margin-top: 80px;
    padding: 20px;
  }

  /* Shift nav bar to top */
  .nav-container {
    top: 10px;
    left: 20px;

    margin-left: 0;
    margin-top: -54px;

    height: 50px;
    width: calc(100vw - 40px);
  }

  nav {
    flex-direction: row;
    gap: 10px;

    width: 100%;
    padding: 7px 7px;

    background: var(--nav-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 30px;
  }

  nav .connect {
    display: none;
  }
  nav a {
    display: none;
  }
  /* Show only important nav links */
  #home {
    display: flex;
  }
  #gallery {
    display: flex;
  }
  #theme {
    display: flex;
  }

  nav select {
    display: block;
    -moz-appearance: none;
    -webkit-appearance: none;

    position: absolute;
    right: 8px;
    text-align: center; /* Doesn't work in safari */

    padding: 0 12px;

    background: var(--background);
    outline: none;
    border: none;
    border-radius: 25px;

    color: var(--text);
    font-weight: bold;
    font-size: 15px;
    height: 40px;

    transition: background .2s;
  }
  nav select:hover {
    background: var(--primary-color);
    color: var(--light-color);
  }

  nav a {
    width: 40px;
    height: 40px;
    margin: 0;
  }
  nav #home img,
  nav #gallery img {
    height: 23px;
    filter: brightness(0);
  }
  nav .divider {
    display: none;
  }

  .heading {
    font-size: 18px;
  }
  .heading img {
    height: 25px;
  }

  .content {
    padding: 0;
  }

  .accordion .detail {
    padding: 0 15px;
    padding-bottom: 30px;
  }

  textarea {
    font-size: 18px;
  }


  #overview ul {
    grid-template-columns: 1fr;
    grid-auto-rows: auto;
    gap: 20px;
  }

  #overview a {
    padding: 10px;
  }

  #overview .description {
    display: none;
  }
  #overview .name {
    margin-bottom: 0;
  }
  
  #explanation .example {
    font-size: 16px;
    letter-spacing: 1px;
    padding: 10px;
    overflow-x: scroll;
    white-space: nowrap;
  }

  #explanation #vigenere-example {
    display: none;
  }
  /* Mobile vigenere square */
  #explanation #mobile-vigenere-example {
    display: block;
  }

  #explanation .example-flex span {
    width: 50%; /* Two columns */
  }


  #test .key-settings {
    flex-direction: column;
  }

  #test .direction-select {
    flex-direction: column;
    gap: 30px;
    margin: 20px 0;
  }


  #code .content {
    flex-direction: column;
  }
  #code .code-wrapper {
    display: none;
  }
  #code .content .instructions {
    display: none;
  }
  /* Mobile code tutorial */
  #code .mobile-instructions-container {
    display: block;
  }

  #code p {
    margin-bottom: 20px;
    margin-right: 0;

    cursor: default;
  }
  #code p:last-of-type {
    margin-bottom: 20px;
  }

  #analysis .frequency-statistic .data span:last-of-type {
    font-family: "Roboto Mono", monospace;
    padding: 10px;
  }

  footer {
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    gap: 40px;

    padding: 30px 15px 30px 15px;
  }
  footer .wpaad-footer {
    font-size: 20px;
  }
  footer .authors {
    font-size: 18px;
  }
  footer .licenses-and-policy {
    font-size: 16px !important;
  }

}

/* Tablet */
@media only screen and (max-width: 1350px) and (min-width: 940px) {
  section {
    max-width: 700px;
    margin: 0 auto;
  }

  body {
    font-size: 18px;
  }

  nav a {
    width: 40px;
    height: 40px;

    margin: 10px 5px;
  }
  nav img {
    height: 25px;
  }

  #overview ul {
    grid-template-columns: 1fr 1fr;
  }

  #code .content .instructions {
    max-width: 300px;
  }
  #code .code {
    max-width: 50vw;
  }

  #analysis .frequency-statistic .data span:last-of-type {
    font-family: "Roboto Mono", monospace;
    padding: 10px;
  }
}

@media (prefers-color-scheme: dark) {
  body {
    --background: #15151c;
    --secondary-background: #26262b;
    --text: #ededed;
    --light-color: #ededed;
    --nav-color: rgba(80, 80, 88, 0.6);
  }

  nav a img,
  nav #home img,
  nav #gallery img {
    filter: brightness(0) invert(1); /* White */
  }

  #test #encrypt-label img:last-of-type,
  #test #decrypt-label img:last-of-type {
    filter: brightness(0) invert(1); /* White */
  }
}