@font-face {
  font-family: "Rubik";
  src: url("./assets/fonts/Rubik-VariableFont_wght.ttf") format("truetype");
  font-weight: 100 900; /* Range the variable font supports */
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Rubik";
  src: url("./assets/fonts/Rubik-Italic-VariableFont.ttf") format("truetype");
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}

:root {
  color-scheme: light dark;

  --clr-neutral-100: hsl(0 0% 100%);
  --clr-neutral-200: hsl(220 38% 97%);
  --clr-neutral-300: hsl(217 59% 74%);
  --clr-neutral-400: hsl(220 12% 40%);
  --clr-neutral-500: hsl(214 26% 32%);
  --clr-neutral-600: hsl(215 24% 26%);

  --clr-primary-200: hsl(278 100% 95%);
  --clr-primary-300: hsl(285 90% 75%);
  --clr-primary-400: hsl(277 91% 56%);

  --clr-accent-1: hsl(153 68% 50%);
  --clr-accent-2: hsl(0 78% 63%);
  --clr-accent-3: hsl(22 100% 96%);
  --clr-accent-4: hsl(151 87% 94%);
  --clr-accent-5: hsl(223 100% 96%);
  --clr-accent-6: hsl(277 100% 95%);

  --clr-shadow-1: hsla(225, 13%, 6%, 0.14);
  --clr-shadow-2: hsl(216 25% 25% / 0.14);

  --clr-text-primary: light-dark(var(--clr-neutral-600), var(--clr-neutral-100));
  --clr-text-secondary: light-dark(var(--clr-neutral-400), var(--clr-neutral-300));
  --clr-surface-primary: light-dark(var(--clr-neutral-200), var(--clr-neutral-600));
  --clr-surface-secondary: light-dark(var(--clr-neutral-100), var(--clr-neutral-500));
  --clr-box-shadow: light-dark(var(--clr-shadow-1), var(--clr-shadow-2));

  --ff-base: "Rubik", Arial, Helvetica, sans-serif;

  --fs-200: calc(14 / 16 * 1rem);
  --fs-300: calc(18 / 16 * 1rem);
  --fs-400: calc(20 / 16 * 1rem);
  --fs-500: calc(24 / 16 * 1rem);
  --fs-600: calc(28 / 16 * 1rem);
  --fs-700: calc(36 / 16 * 1rem);
  --fs-750: calc(40 / 16 * 1rem);
  --fs-800: calc(64 / 16 * 1rem);
  --fs-900: calc(144 / 16 * 1rem);

  --fs-heading-lg: var(--fs-750);
  --fs-heading-sm: var(--fs-400);
  --fs-body-sm: var(--fs-200);
  --fs-body: var(--fs-300);

  --fw-regular: 400;
  --fw-medium: 500;
  --fw-bold: 700;

  --br: 0.75rem;
  --box-shadow: 0 1rem 4rem var(--clr-box-shadow);
}

@media (width > 40em) {
  :root {
    --fs-heading-lg: var(--fs-800);
    --fs-heading-sm: var(--fs-700);
    --fs-body-sm: var(--fs-400);
    --fs-body: var(--fs-600);
  }
}

/* reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

h1,
.h1,
h2,
.h2,
h3,
.h3,
h4,
.h4 {
  line-height: 1;
}

body,
h1,
h2,
h3,
p,
dl,
dd,
figure,
blockquote {
  margin: 0;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
  padding: 0;
}

body {
  min-height: 100vh;
  line-height: 1.5;
}

input,
button,
textarea,
select {
  font: inherit;
}

img,
picture {
  max-inline-size: 100%;
  display: block;
}

/* General Styles */

html[data-theme="light"] {
  color-scheme: light;
}

html[data-theme="dark"] {
  color-scheme: dark;
}

html[data-theme="light"] body {
  background-image: url(./assets/images/pattern-background-mobile-light.svg);
}

html[data-theme="dark"] body {
  background-image: url(./assets/images/pattern-background-mobile-dark.svg);
}

body {
  font-family: var(--ff-base);
  font-size: var(--fs-body);
  color: var(--clr-text-primary);
  background: var(--clr-surface-primary);
  padding-inline: clamp(1.5rem, 5vw + 0.1rem, 4rem);
  background-size: cover;
  background-repeat: no-repeat;
}

@media (width > 40em) {
  body {
    padding-block: clamp(3.5rem, 10vh + 0.1rem, 5.25rem);
  }

  html[data-theme="light"] body {
    background-image: url(./assets/images/pattern-background-tablet-light.svg);
  }

  html[data-theme="dark"] body {
    background-image: url(./assets/images/pattern-background-tablet-dark.svg);
  }
}

@media (width > 70em) {
  html[data-theme="light"] body {
    background-image: url(./assets/images/pattern-background-desktop-light.svg);
  }

  html[data-theme="dark"] body {
    background-image: url(./assets/images/pattern-background-desktop-dark.svg);
  }
}

section {
  display: grid;
  gap: 2.5rem;
}

@media (width > 70em) {
  section {
    gap: 10rem;
    grid-template-columns: 1fr 1fr;
    margin-block-start: 3.75rem;
  }
}

header,
main {
  max-width: 80rem;
  margin-inline: auto;
}

fieldset {
  border: 0;
  padding: 0;
}

/* Typography */
.title {
  font-size: var(--fs-heading-lg);
  font-weight: var(--fw-regular);
  text-wrap: balance;
}

.fw-medium {
  font-weight: var(--fw-medium);
}

.fw-bold {
  font-weight: var(--fw-bold);
}

.italic {
  font-style: italic;
  color: var(--clr-text-secondary);
}

.fs-body-sm {
  font-size: var(--fs-body-sm);
}

.fs-heading-sm {
  font-size: var(--fs-heading-sm);
}

.fs-heading-xlg {
  font-size: var(--fs-900);
}

.text-secondary-clr {
  color: var(--clr-text-secondary);
}

.text-center {
  text-align: center;
}

/* Layout */
.flow-content > * + * {
  margin-block-start: var(--flow-spacer, 1rem);
}

.flow-content--sm {
  --flow-spacer: 0.75rem;
}

.flex-center {
  display: flex;
  gap: var(--flex-gap, 1rem);
  align-items: center;
}

.align-right {
  margin-inline-start: auto;
}

.justify-center {
  justify-content: center;
}

.grid-gap {
  display: grid;
  gap: var(--gap, 0.75rem);
}

@media (width>70em) {
  .grid-gap {
    --gap: 1.5rem;
  }
}

/* Utilities */
.visually-hidden:not(:focus):not(:active) {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0); /* Legacy property for Internet Explorer */
  clip-path: inset(50%);
  white-space: nowrap;
}

.hidden {
  display: none;
}

.padding-sm {
  padding-block: 1.5rem;
}

.padding-lg {
  padding-block: 2rem;
}

/* Components */
.button {
  cursor: pointer;
  background: var(--bg, var(--clr-surface-secondary));
  color: inherit;
  font-weight: var(--fw-medium);
  box-shadow: var(--box-shadow);
  border: 3px solid transparent;
  border-radius: var(--br);
  padding: 0.75em;
  transition: scale 300ms ease-in-out;
}

.button:hover,
.button:focus-visible {
  scale: 1.05;
}

.button--primary {
  --bg: var(--clr-primary-400);
  color: var(--clr-neutral-100);
  transition: background 300ms ease-in-out;
}

.button--primary:hover,
.button--primary:focus-visible {
  --bg: var(--clr-primary-300);
}

.icon {
  background: var(--bg, var(--clr-neutral-200));
  color: var(--fg, var(--clr-neutral-600));
  border-radius: calc(var(--br) / 2);
  padding: 0.5rem;
}

.icon:not(img) {
  padding: 0.75em;
  line-height: 1;
}

[data-topic="HTML"] .icon {
  --bg: var(--clr-accent-3);
}

[data-topic="CSS"] .icon {
  --bg: var(--clr-accent-4);
}

[data-topic="JavaScript"] .icon {
  --bg: var(--clr-accent-5);
}

[data-topic="Accessibility"] .icon {
  --bg: var(--clr-accent-6);
}

.error {
  color: var(--clr-accent-2);
}

.toggle-switch {
  position: relative;
  width: 2.25rem;
  height: 1.5rem;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-switch .slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--clr-primary-400);
  border-radius: 100vw;
}

.toggle-switch .slider::before {
  position: absolute;
  content: "";
  width: 1rem;
  aspect-ratio: 1;
  border-radius: 50%;
  left: 0.25rem;
  bottom: 0.25rem;
  background-color: var(--clr-neutral-100);
}

.toggle-switch input:checked + .slider::before {
  left: unset;
  right: 0.25rem;
}

.answer-choices label {
  position: relative;
}

.answer-choices input[type="radio"] {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.answer-choices label:has(input[type="radio"]:checked) {
  border-color: var(--clr-primary-400);
}

.answer-choices input[type="radio"]:checked + .icon {
  --bg: var(--clr-primary-400);
  --fg: var(--clr-neutral-100);
}

.answer-choices label:has(input[type="radio"]:checked).correct {
  border-color: var(--clr-accent-1);
}

.answer-choices label:has(input[type="radio"]:checked).correct .icon {
  --bg: var(--clr-accent-1);
  --fg: var(--clr-neutral-100);
}

.answer-choices label:has(input[type="radio"]:checked).correct .correct-icon {
  display: inline-block;
  margin-inline-start: auto;
}

.answer-choices label:has(input[type="radio"]:checked).incorrect {
  border-color: var(--clr-accent-2);
}

.answer-choices label:has(input[type="radio"]:checked).incorrect .icon {
  --bg: var(--clr-accent-2);
  --fg: var(--clr-neutral-100);
}

.answer-choices label:has(input[type="radio"]:checked).incorrect .incorrect-icon {
  display: inline-block;
  margin-inline-start: auto;
}

/* Block */
.primary-header .current-quiz {
  max-width: 10rem;
}

.primary-header .current-quiz .icon {
  max-width: 2.5rem;
}

html[data-theme="light"] .sun-icon {
  content: url(./assets/images/icon-sun-dark.svg);
}

html[data-theme="light"] .moon-icon {
  content: url(./assets/images/icon-moon-dark.svg);
}

html[data-theme="dark"] .sun-icon {
  content: url(./assets/images/icon-sun-light.svg);
}

html[data-theme="dark"] .moon-icon {
  content: url(./assets/images/icon-moon-light.svg);
}

.quiz-topics .options {
  --flow-spacer: 0.75rem;
}

.quiz-questions .question-container {
  --gap: 0.75rem;
}

.progress-bar-container {
  --flow-spacer: 1.5rem;
  --_height: 1rem;
  width: 100%;
  height: var(--_height);
  background: var(--clr-surface-secondary);
  border-radius: 100vw;
  padding: calc(var(--_height) / 4);
}

.progress-bar-container .progress-bar {
  --_percentage: 10%;
  width: var(--_percentage);
  height: calc(var(--_height) / 2);
  background: var(--clr-primary-400);
  border-radius: inherit;
}

.quiz-score .score-container {
  color: var(--clr-neutral-600);
  background: var(--clr-neutral-100);
  padding: 2rem;
  border-radius: var(--br);
  box-shadow: var(--box-shadow);
}

.score-container .text-secondary-clr {
  color: var(--clr-neutral-400);
}

.score-container .current-quiz {
  margin-inline: auto;
}

/* Exceptions */
@media (width>70em) {
  .quiz-topics > :first-child {
    --flow-spacer: 3rem;
  }

  .quiz-questions .question-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    height: 100%;
  }

  .progress-bar-container {
    margin-block-start: auto;
    margin-block-end: 7.125rem;
  }
}