@import url("https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap");

* {
  font-family: "Poppins", sans-serif;
}

html {
  font-size: 100%;
}

/* Navbar */

@media all and (max-width: 640px) {
  html {
    font-size: 75%;
  }

  /* Navbar */

  .navbar {
    padding: 0;
    width: 90%;
    margin: 0 auto;
  }

  .logo {
    width: 4rem;
  }

  .tabs p {
    font-size: 1rem;
  }

  /* Hero */

  .hero {
    flex-direction: column-reverse;
    gap: 3rem;
    width: 90%;
  }

  .lower-description p br:first-child {
    display: none;
  }

  .hero-button-container {
    margin-top: 1rem;
  }

  /* Class Card */

  .class-card div {
    border: 1px solid black;
    padding: 5px 10px;
    border-radius: 1rem;
  }

  .class-board {
    font-size: 0.8rem;
  }

  .class-name {
    font-size: 1rem;
    text-align: center;
  }

  .class-name sup {
    font-size: 0.8rem;
  }

  .class-card-one,
  .class-card-two,
  .class-card-three {
    -moz-box-shadow: 2px 2px 1px 0px rgba(0, 0, 0, 1);
    -webkit-box-shadow: 2px 2px 1px 0px rgba(0, 0, 0, 1);
    box-shadow: 2px 2px 1px 0px rgba(0, 0, 0, 1);
  }

  .class-card-one:hover,
  .class-card-two:hover,
  .class-card-three:hover {
    -moz-box-shadow: 2px 2px 5px 0px rgba(255, 255, 255, 0.75);
    -webkit-box-shadow: 2px 2px 5px 0px rgba(255, 255, 255, 0.75);
    /* box-shadow: 10px 5px 1px 0px rgba(0, 0, 0, 0.2); */
    box-shadow: 2px 2px 0px 0px #fff, 2px 2px 0px 1px rgba(0, 0, 0, 1);
  }

  /* Money Back Guarantee Section */

  .money-back-guarantee {
    margin: 3rem auto;
    width: 90%;
  }

  .money-back-guarantee h2 {
    font-size: 1.8rem;
    font-weight: 400;
    width: 90%;
    text-align: center;
  }

  .money-back-guarantee p {
    font-size: 1rem;
  }

  .video-description {
    flex-direction: column;
    width: 100%;
    margin: 0 auto;
    padding: 0;
  }

  .video-thumbnail {
    width: 100%;
  }

  .video-thumbnail iframe {
    width: 100%;
    height: 100%;
  }

  .about {
    max-width: 100%;
  }

  .about h3 {
    font-size: 1.2rem;
  }

  /* Topics */

  .topics {
    width: 90%;
    margin: 0 auto;
    gap: 1rem;
  }

  .notes,
  .tests {
    margin: 0 auto;
    width: 100%;
  }

  .topics-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .topic img {
    width: 100px;
  }

  .line {
    width: 50px;
  }

  .topic-headline {
    font-size: 1.5rem;
  }

  /* Sample Video */

  .sample-videos-thumbnails {
    grid-template-columns: 1fr;
  }

  .video iframe {
    width: 100%;
    height: auto;
  }

  /* Form */

  .form {
    padding: 0.1rem;
  }

  .name-field {
    gap: 0.5rem;
    flex-direction: column;
  }

  .name-field input {
    width: 90%;
  }

  .contact-field {
    flex-direction: column;
    gap: 0.5rem;
  }

  .contact-field input {
    width: 90%;
  }

  /* Contact Us */

  .faded-line p {
    font-size: 0.8rem;
  }

  .contacts {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  /* Footer */

  .footer-section {
    width: 100%;
  }

  .upper-footer-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
  }

  .the-quote {
    font-size: 1rem;
  }

  .useful-links ul {
    font-size: 1rem;
  }

  .footer-info p:nth-child(1) {
    font-size: 1rem;
  }
}