/* Colors 
:root {
  --clr-light: #fdffc4;
  --clr-dark: #121212;
  --clr-primary: #dbffa2;
  --clr-secondary: #c3fcf2;
  --clr-accent: #ff7750;
}
*/

/* ------------  Themes and Variables  ------------ */
:root {
  --font-size: 16px;
  --pad-main: 1rem;
  --brd-radius-main: 2rem;
  --brd-radius-btn-main: 1rem;
  --mrg-main: 1rem;


  font-size: var(--font-size);
}

/* Light Theme*/
@media all and (prefers-color-scheme: light) {
  :root {
    --clr-text: #24292F;
    --clr-text-lighter: #323841;
    --clr-link: #0969DA;
    --clr-link-hover: #064c9b;
    --clr-background: #e7eaec;
    --clr-background-lighter: #F6F8FA;
    --clr-background-darker: #cbcdcf;
  }

  /* costum theme switch override: Dark theme */
  :root.dark-theme {
    --clr-text: #D5D7DE;
    --clr-text-lighter: ;
    --clr-link: #4b9fff;
    --clr-link-hover: #2278db;
    --clr-background: #1d1e22;
    --clr-background-lighter: #2c303a;
    --clr-background-darker: #131417;
  }
}

/* Dark Theme (not light) */
@media not all and (prefers-color-scheme: light) {
  :root {
    --clr-text: #D5D7DE;
    --clr-text-lighter: ;
    --clr-link: #4b9fff;
    --clr-link-hover: #2278db;
    --clr-background: #1d1e22;
    --clr-background-lighter: #2c303a;
    --clr-background-darker: #131417;
  }

  /* costum theme switch override: Light theme */
  :root.light-theme {
    --clr-text: #24292F;
    --clr-text-lighter: #323841;
    --clr-link: #0969DA;
    --clr-link-hover: #064c9b;
    --clr-background: #e7eaec;
    --clr-background-lighter: #F6F8FA;
    --clr-background-darker: #cbcdcf;
  }
}
/*----------------------------------------------------*/

/* --------------------  General  -------------------- */

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

html {
  color: var(--clr-text);
  font-family: "Lato", Verdana, sans-serif;
  scroll-behavior: smooth;
}

body {
  background-color: var(--clr-background-darker);
  margin: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Rubik", Verdana, sans-serif;
  font-weight: normal;
  text-align: center;
  text-transform: uppercase;

  padding: 0;
  margin: 1rem;
}
h1{
  font-size: 2.2rem;
  text-transform:none;
}
h2{
  font-size: 1.8rem;
}
h2{
  font-size: 1.6rem;
}
h3{
  font-size: 1.4rem;
}
h4{
  font-size: 1.3rem;
}
h5 {
  font-size: 1.2rem;
}

a{
  color: var(--clr-link);
  transition: color 0.3s;
  text-decoration: none;
  
}
a:hover{
  color: var(--clr-link-hover);
}
a:visited{
  
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--pad-main);
  border-radius: var(--brd-radius-main);
  background-color: var(--clr-background);
}

p {
  text-align: justify;
  line-height: 1.4rem;
}

button {
  border: 0;
  padding: 1rem;
  background-color: var(--clr-link);
  border-radius: var(--brd-radius-btn-main);
  font-size: 1rem;
}
button:hover {
  background-color: var(--clr-link-hover);
}

.lesson-nav-buttom {
  display: flex;
  flex-wrap: nowrap;
  justify-content: space-around;
  padding-top: var(--pad-main);
  padding-bottom: var(--pad-main);
}

/*----------------------------------------------------*/

/* --------------  Horizontal scroller  --------------- */

.vertical-scroller iframe {
  display: block;
  margin: auto;
  width: 100%;
  aspect-ratio: 16/9;
}

.vertical-scroller-title {
  border-radius: 0;
  border-top-left-radius: var(--brd-radius-main);
  border-top-right-radius: var(--brd-radius-main);
  margin-top: var(--mrg-main);
  padding-bottom: 1px;
}

.vertical-scroller {
  --_spacer: 1rem;
  display: grid;
  gap: var(--_spacer);
  grid-auto-flow:column;
  grid-auto-columns: 36%;

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

  padding: var(--_spacer) 0;

  overflow-x: auto;
  overscroll-behavior-inline: contain;
  margin-bottom: 1rem;
}

.vertical-element {
  display: grid;
  grid-template-rows: min-content;
  align-self: flex-start;
  gap: var(--_spacer);
  padding: var(--_spacer);
  background: var(--clr-background-lighter);
  border-radius: var(--brd-radius-main);
}
.vertical-element .details {
  display: flex;
  list-style: none;
  justify-content: space-between;
  flex-wrap: nowrap;
  gap: 0.4rem;
  padding: 0;
  margin: 0;
  
  text-align: center;
}
.vertical-element p {
  padding: 0;
  margin: 0;
}

.snaps-inline {
  scroll-snap-type: inline mandatory;
  scroll-padding-inline: var(--_spacer, 1rem);
}

.snaps-inline > * {
  scroll-snap-align: start;
}

@media only screen and (max-width: 768px) {
  .vertical-scroller {
    grid-auto-columns: 90%;
  }
}

.vertical-scroller-title h4 {
  font-size: 1.3rem;
  margin-bottom: 0;
}

.vertical-scroller h5 {
  font-size: 1.2rem;
  font-weight: normal;
  text-transform: none;
  margin: 0;
}

/*----------------------------------------------------*/

/* ----------------- Header and menu ---------------------*/

header {
  padding: 0.4rem;
  margin-bottom: 1rem;
  background-color: var(--clr-background-lighter);
  border-bottom-left-radius: var(--brd-radius-main);
  border-bottom-right-radius: var(--brd-radius-main);
  font-family: "Rubik", Verdana, sans-serif;
}

nav li {
  list-style: none;
}

nav a {
  text-decoration: none;
}

.header{
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1.5rem;
}

.navbar {

}

.hamburger {
  display: none;
}

.bar {
  display: block;
  width: 25px;
  height: 3px;
  margin: 5px auto;
  -webkit-transition: all 0.3s ease-in-out;
  transition: all 0.3s ease-in-out;
  background-color: var(--clr-text);
}

.nav-menu {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-item {
  margin-left: 3rem;
}

.nav-link{
}

.nav-link:hover{
}

@media only screen and (max-width: 768px) {
  .nav-menu {
      position: fixed;
      left: 0;
      top: -100%;
      flex-direction: column;
      background-color: var(--clr-background-lighter);
      width: 100%;
      border-radius: var(--brd-radius-main);
      text-align: center;
      transition: 0.3s;
      box-shadow:
          0 10px 27px rgba(0, 0, 0, 0.05);
      margin: 0;
  }

  .nav-menu.active {
      left: 0;
      top: 0;
  }

  .nav-item {
      margin: 1rem 0;
  }

  .hamburger {
      display: block;
      cursor: pointer;
      margin: 1rem 0;
  }

  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
}

.hamburger.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

}

.btn-theme-toggle .material-symbols-outlined {
  font-variation-settings: "FILL" 1, "wght" 400, "GRAD" 0, "opsz" 48;
}
button.btn-theme-toggle{
  background: none;
  border: none;
  padding: 0;
  color: var(--clr-link);
  transition: color 0.3s;
}

button.btn-theme-toggle:hover{
  color: var(--clr-link-hover);
}

.material-symbols-outlined {
  font-variation-settings:
  'FILL' 0,
  'wght' 400,
  'GRAD' 1,
  'opsz' 40;
}

.alcim {
  text-align: center;
  font-size: 1.2rem;
}