*,
*::after,
*::before {
  margin: 0;
  padding: 0;
  box-sizing: inherit; }

html {
  font-size: 62.5%; }
  @media only screen and (min-width: 112.5em) {
    html {
      font-size: 75%; } }
  @media only screen and (max-width: 75em) {
    html {
      font-size: 56.25%; } }
  @media only screen and (max-width: 56.25em) {
    html {
      font-size: 50%; } }
  @media only screen and (max-width: 37.5em) {
    html {
      font-size: 40%; } }

body {
  box-sizing: border-box;
  background-image: url("../img/leaves.jpg");
  background-position: center; }

::selection {
  background-color: #006400;
  color: #000; }

body {
  font-weight: 400;
  line-height: 1.7;
  color: #fff; }

body.light {
  color: #000; }

.heading-primary {
  font-size: 8rem;
  text-transform: uppercase;
  font-weight: 700;
  background-image: linear-gradient(to left bottom, #32cd32, #006400);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent; }

.heading-tertiary {
  font-size: 2rem; }

.hidden {
  display: none;
  opacity: 0; }

.disabled {
  background-color: rgba(51, 51, 51, 0.6);
  color: #ddd;
  cursor: auto !important; }

.highlighted {
  color: #32cd32; }

.selected {
  background-color: rgba(50, 205, 50, 0.6);
  color: #fff; }

.board {
  padding: 2rem 5rem; }
  @media only screen and (max-width: 56.25em) {
    .board {
      padding: 2rem 0rem; } }
  .board__table {
    border-collapse: collapse;
    display: flex;
    flex-direction: column; }
  .board__row-group {
    display: flex;
    flex-direction: column; }
  .board__row-group:not(:last-child) {
    border-bottom: 2px solid #ddd; }
  .board__row {
    display: flex; }
    .board__row:not(:last-child) {
      border-bottom: 1px solid #333; }
  .board__cell {
    width: 6rem;
    height: 6rem;
    display: flex;
    align-items: center;
    justify-content: center; }
    .board__cell:not(:last-child) {
      border-right: 1px solid #333; }
    .board__cell:nth-child(3), .board__cell:nth-child(6) {
      border-right: 2px solid #ddd !important; }

.tile {
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  width: 80%;
  height: 80%;
  font-size: 3rem;
  cursor: pointer; }
  .tile--big {
    width: 6rem;
    height: 6rem;
    border: 3px solid #006400;
    font-size: 4rem;
    margin-left: 1rem;
    margin-top: 1rem; }

.button, .button:link, .button:visited {
  text-transform: uppercase;
  text-decoration: none;
  padding: 1.5rem 3rem;
  display: inline-block;
  transition: all 0.2s;
  position: relative;
  font-size: 1.6rem;
  border: none;
  cursor: pointer; }

.button:hover {
  box-shadow: 0 1rem 2rem rgba(255, 255, 255, 0.2); }

.button:focus, .button:active {
  outline: none;
  box-shadow: 0 0.5rem 1rem rgba(255, 255, 255, 0.2); }

.button--cta {
  border-radius: 1rem; }
  .button--cta:hover {
    background-color: #fff; }

.button--round {
  width: 5rem;
  height: 5rem;
  padding: 1rem;
  background-color: #ddd;
  border-radius: 50%; }

.inline-link {
  text-decoration: none;
  color: inherit;
  color: #fb000d;
  position: relative;
  padding-bottom: 1rem; }
  .inline-link:after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0%;
    height: 100%;
    border-bottom: 2px solid #fb000d;
    transition: width 0.3s ease; }
  .inline-link:hover:after {
    left: 0;
    width: 100%;
    transition: width 0.3s ease; }

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  z-index: 100;
  transition: all 0.5s; }

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 100rem;
  width: 75vw;
  background-color: #fff;
  border-radius: 1rem;
  padding: 5rem 6rem;
  box-shadow: 0 4rem 6rem rgba(0, 0, 0, 0.25);
  z-index: 1000;
  transition: all 0.5s; }
  .modal__header {
    color: #000;
    font-size: 4.5rem;
    text-align: center; }
  .modal__text {
    color: #000;
    font-size: 3.5rem;
    text-align: center; }
  .modal .btn--close-modal {
    font-family: inherit;
    position: absolute;
    top: 0.5rem;
    right: 1.6rem;
    font-size: 3.5rem;
    cursor: pointer;
    border: none;
    background: none; }

.social {
  display: flex;
  justify-content: center; }
  .social__link {
    width: 5rem;
    height: 5rem;
    padding: 1rem;
    background-color: #ddd;
    border-radius: 50%;
    margin-right: 1rem; }
    .social__link:hover {
      background-color: #fff; }
  .social__icon {
    width: 100%;
    height: 100%; }

.timer {
  font-size: 5rem;
  text-align: center; }

.container {
  max-width: 120rem;
  margin: 8rem auto;
  background-color: #000;
  box-shadow: 0 2rem 6rem rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  justify-content: space-between; }
  @media only screen and (max-width: 75em) {
    .container {
      margin: 0;
      min-height: 100vh;
      max-width: 100%; } }

.header {
  text-align: center; }

.footer {
  color: #ddd;
  text-align: center;
  padding: 3rem 0;
  margin-top: 5rem;
  font-size: 1.6rem; }

.setup-section {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column; }
  .setup-section .difficulty-form {
    text-align: center;
    padding-bottom: 2rem; }

.toolbar-section {
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 5rem 10rem; }

.game-section {
  display: flex;
  justify-content: center;
  align-items: center;
  user-select: none; }
  @media only screen and (max-width: 56.25em) {
    .game-section {
      flex-direction: column; } }

.number-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  flex: 0 0 auto;
  flex-direction: column;
  height: 35rem; }
  @media only screen and (max-width: 56.25em) {
    .number-container {
      flex-direction: row;
      width: 35rem;
      height: auto; } }