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

*:focus {
  outline: none;
}

html {
  box-sizing: inherit;
  font-size: 62.5%;
}

body {
  background-color: #f3f3f3;
}

:root {
  --color-font-primary: #444;
  --font-family-primary: 'Poppins', sans-serif;
  --color-primary: #5ec576;
  --color-secondary: #ffcb03;
  --color-tertiary: #ff585f;
  --color-primary-darker: #4bbb7d;
  --color-secondary-darker: #ffbb00;
  --color-tertiary-darker: #fd424b;
  --color-primary-opacity: #5ec5763a;
  --color-secondary-opacity: #ffcd0331;
  --color-tertiary-opacity: #ff58602d;
  --gradient-primary: linear-gradient(to top left, #39b385, #9be15d);
  --gradient-secondary: linear-gradient(to top left, #ffb003, #ffcb03);
}

header {
  padding: 0 3rem;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;

  .sticky {
    position: fixed;
    background-color: rgba(255, 255, 255, 0.95);
  }

  nav {
    padding: 0 6rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    height: 9rem;
    z-index: 100;

    .nav__logo {
      height: 4.5rem;
      transition: all 0.3s;
    }

    .nav__links {
      display: flex;
      align-items: center;
      list-style-type: none;

      .nav__item {
        margin-left: 4rem;

        .nav__link {
          &:link,
          &:visited {
            display: block;
            font: 400 1.7rem / 1.9 var(--font-family-primary);
            color: var(--color-font-primary);
            text-decoration: none;
            transition: all 0.3s;
          }
        }

        .nav__link--btn {
          &:link,
          &:visited {
            padding: 0.8rem 2.5rem;
            border-radius: 3rem;
            background-color: var(--color-primary);
            color: #222;
          }

          &:hover,
          &:active {
            background: var(--color-primary-darker);
            color: #333;
          }
        }
      }
    }
  }

  .header__title {
    flex: 1;
    max-width: 115rem;
    display: grid;
    grid-template-columns: 3fr 2fr;
    row-gap: 3rem;
    align-content: center;
    justify-content: center;
    align-items: start;
    justify-items: start;

    h1 {
      font: 600 5.5rem / 1.35 var(--font-family-primary);
      color: var(--color-font-primary);

      .highlight {
        position: relative;

        &::after {
          content: '';
          position: absolute;
          display: block;
          bottom: 0;
          left: 0;
          width: 100%;
          height: 100%;
          background-image: var(--gradient-primary);
          opacity: 0.7;
          transform: scale(1.07, 1.05) skewX(-15deg);
          z-index: -1;
        }
      }
    }

    h4 {
      font: 500 2.4rem / 1.9 var(--font-family-primary);
      color: var(--color-font-primary);
    }

    .btn--text {
      padding-bottom: 2px;
      display: inline-block;
      background: none;
      border: none;
      border-bottom: 1px solid currentColor;
      color: var(--color-primary);
      font: 500 1.7rem var(--font-family-primary);
      cursor: pointer;
      transition: all 0.3s;
    }

    .header__img {
      width: 100%;
      grid-column: 2 / 3;
      grid-row: 1 / span 4;
      transform: translateY(-6rem);
    }
  }
}

main {
  .section {
    padding: 15rem 3rem;
    border-top: 1px solid #ddd;
    transition: transform 1s, opacity 1s;

    .section__title {
      margin: 0 auto 8rem;
      max-width: 80rem;
    }

    .section__description {
      margin-bottom: 1rem;
      color: var(--color-primary);
      font: 600 1.8rem / 1.9 var(--font-family-primary);
      text-transform: uppercase;
    }

    .section__header {
      font: 500 4rem / 1.3 var(--font-family-primary);
      color: var(--color-font-primary);
    }
  }

  .section--hidden {
    opacity: 0;
    transform: translateY(8rem);
  }

  #section--1 {
    .features {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 4rem;
      margin: 0 12rem;

      .features__img {
        width: 100%;
        transition: filter 0.5s;
      }

      .lazy-img {
        filter: blur(20px);
      }

      .features__feature {
        align-self: center;
        justify-self: center;
        width: 70%;
        color: var(--color-font-primary);
        font: 300 1.5rem / 1.9 var(--font-family-primary);

        .features__icon {
          margin-bottom: 2rem;
          display: flex;
          align-items: center;
          justify-content: center;
          background-color: var(--color-primary-opacity);
          width: 5.5rem;
          height: 5.5rem;
          border-radius: 50%;

          svg {
            width: 2.5rem;
            height: 2.5rem;
            fill: var(--color-primary);
          }
        }

        .features__header {
          margin-bottom: 1rem;
          font: 600 2rem / 1.9 var(--font-family-primary);
          color: var(--color-font-primary);
        }

        p {
          color: #666;
        }
      }
    }
  }

  #section--2 {
    .operations {
      margin: 12rem auto 0;
      max-width: 100rem;
      background-color: #fff;

      .operations__tab-container {
        display: flex;
        justify-content: center;

        .btn {
          padding: 1.25rem 4.5rem;
          display: inline-block;
          border: none;
          border-radius: 10rem;
          color: var(--color-font-primary);
          font: 500 1.6rem / 1.9 var(--font-family-primary);
          cursor: pointer;
          transition: all 0.3s;
        }

        .operations__tab {
          margin-right: 2.5rem;
          transform: translateY(-50%);

          span {
            margin-right: 1rem;
            display: inline-block;
            font-weight: 600;
          }
        }

        .operations__tab--active {
          transform: translateY(-66%);
        }

        .operations__tab--1 {
          background-color: var(--color-secondary);

          &:hover {
            background-color: var(--color-secondary-darker);
          }
        }

        .operations__tab--2 {
          background-color: var(--color-primary);

          &:hover {
            background-color: var(--color-primary-darker);
          }
        }

        .operations__tab--3 {
          background-color: var(--color-tertiary);

          &:hover {
            background-color: var(--color-tertiary-darker);
          }
        }
      }
    }

    .operations__content {
      padding: 2.5rem 7rem 6.5rem;
      display: none;
      font: 300 1.7rem / 1.9 var(--font-family-primary);

      .operations__icon {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 7rem;
        height: 7rem;
        border-radius: 50%;

        svg {
          width: 2.75rem;
          height: 2.75rem;
        }
      }

      .operations__icon--1 {
        background-color: var(--color-secondary-opacity);

        svg {
          fill: var(--color-secondary-darker);
        }
      }

      .operations__icon--2 {
        background-color: var(--color-primary-opacity);

        svg {
          fill: var(--color-primary);
        }
      }
      .operations__icon--3 {
        background-color: var(--color-tertiary-opacity);

        svg {
          fill: var(--color-tertiary);
        }
      }

      .operations__header {
        align-self: center;
        color: var(--color-font-primary);
        font: 500 2.25rem var(--font-family-primary);
      }

      p {
        grid-column: 2;
        color: #666;
      }
    }

    .operations__content--active {
      display: grid;
      grid-template-columns: 7rem 1fr;
      column-gap: 3rem;
      row-gap: 0.5rem;
    }
  }

  #section--3 {
    .slider {
      margin: 0 auto;
      position: relative;
      max-width: 100rem;
      height: 50rem;
      overflow: hidden;

      .slide {
        position: absolute;
        top: 0;
        width: 100%;
        height: 50rem;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: transform 1s;

        .testimonial {
          position: relative;
          width: 65%;

          &::before {
            content: '\201C';
            position: absolute;
            top: -5.7rem;
            left: -6.8rem;
            font: 300 20rem / 1 var(--font-family-primary);
            color: var(--color-primary);
            z-index: -1;
          }

          .testimonial__header {
            margin-bottom: 1.5rem;
            color: var(--color-font-primary);
            font: 500 2.25rem / 1.9 var(--font-family-primary);
          }

          .testimonial__text {
            margin-bottom: 3.5rem;
            color: #666;
            font: 300 1.7rem / 1.9 var(--font-family-primary);
          }

          .testimonial__author {
            margin-left: 3rem;
            display: grid;
            grid-template-columns: 6.5rem 1fr;
            column-gap: 2rem;

            .testimonial__photo {
              grid-row: 1 / span 2;
              width: 100%;
              height: 100%;
              object-fit: cover;
              border-radius: 50%;
            }

            .testimonial__name {
              margin: 0;
              align-self: end;
              color: var(--color-font-primary);
              font: normal 500 1.7rem / 1.9 var(--font-family-primary);
            }

            .testimonial__location {
              color: var(--color-font-primary);
              font: normal 300 1.5rem / 1.9 var(--font-family-primary);
            }
          }
        }
      }

      .slider__btn {
        position: absolute;
        top: 50%;
        width: 5.5rem;
        height: 5.5rem;
        border: none;
        border-radius: 50%;
        background-color: rgba(255, 255, 255, 0.7);
        color: #333;
        font: 300 3.25rem var(--font-family-primary);
        cursor: pointer;
        z-index: 10;

        &:focus {
          outline: none;
        }
      }

      .slider__btn--left {
        left: 6%;
        transform: translate(-50%, -50%);
      }

      .slider__btn--right {
        right: 6%;
        transform: translate(50%, -50%);
      }

      .dots {
        position: absolute;
        display: flex;
        bottom: 5%;
        left: 50%;
        transform: translateX(-50%);
      }

      .dots__dot {
        margin-right: 1.75rem;
        width: 1rem;
        height: 1rem;
        border: none;
        border-radius: 50%;
        background-color: #b9b9b9;
        cursor: pointer;
        transition: all 0.5s;

        &:last-child {
          margin: 0;
        }

        &:focus {
          outline: none;
        }
      }

      .dots__dot--active {
        background-color: #888;
        opacity: 1;
      }
    }
  }

  .section--sign-up {
    padding: 10rem 3rem;
    text-align: center;
    border-top: none;
    border-bottom: 1px solid var(--color-font-primary);
    background-color: #37383d;

    .section__title {
      margin-bottom: 6rem;

      .section__header {
        text-align: center;
        color: #fff;
      }
    }

    .btn {
      padding: 2rem 5rem;
      display: inline-block;
      border: none;
      border-radius: 10rem;
      background-color: var(--color-primary);
      color: var(--color-font-primary);
      font: 500 1.9rem var(--font-family-primary);
      cursor: pointer;
      transition: all 0.3s;

      &:hover {
        background-color: var(--color-primary-darker);
      }
    }
  }
}

footer {
  padding: 10rem 3rem;
  background-color: #37383d;

  .footer__nav {
    margin-bottom: 5rem;
    display: flex;
    justify-content: center;
    list-style-type: none;

    .footer__item {
      margin-right: 4rem;

      .footer__link {
        font: 300 1.6rem / 1.9 var(--font-family-primary);
        color: #eee;
        text-decoration: none;
      }
    }
  }

  .footer__logo {
    margin: 0 auto 5rem;
    height: 5rem;
    display: block;
  }

  .footer__copyright {
    text-align: center;
    color: #aaa;
    font: 300 1.4rem var(--font-family-primary);

    .footer__link {
      color: #eee;
      font: 300 1.4rem / 1.9 var(--font-family-primary);
      text-decoration: none;
    }
  }
}

.modal {
  padding: 5rem 6rem;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 60rem;
  background-color: #f3f3f3;
  box-shadow: 0 4rem 6rem rgba(0, 0, 0, 0.3);
  z-index: 1000;
  transition: all 0.5s;

  .btn--close-modal {
    position: absolute;
    top: 0.5rem;
    right: 2rem;
    border: none;
    background: none;
    color: var(--color-font-primary);
    font: 400 4rem var(--font-family-primary);
    cursor: pointer;
  }

  .modal__header {
    margin-bottom: 4.5rem;
    color: var(--color-font-primary);
    font: 600 3.25rem / 1.5 var(--font-family-primary);

    .highlight {
      position: relative;

      &::after {
        display: block;
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        height: 100%;
        width: 100%;
        z-index: -1;
        opacity: 0.7;
        transform: scale(1.07, 1.05) skewX(-15deg);
        background-image: var(--gradient-primary);
      }
    }
  }

  .modal__form {
    margin: 0 3rem;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2.5rem;
    align-items: center;

    label {
      color: var(--color-font-primary);
      font: 500 1.7rem var(--font-family-primary);
    }

    input {
      padding: 0.7rem 1.5rem;
      border: 1px solid #ddd;
      border-radius: 0.5rem;
      font: 300 1.7rem var(--font-family-primary);
    }
  }

  .btn {
    margin-top: 1rem;
    padding: 1.25rem 4.5rem;
    grid-column: 1 / span 2;
    justify-self: center;
    display: inline-block;
    border: none;
    border-radius: 10rem;
    background-color: var(--color-primary);
    color: var(--color-font-primary);
    font: 500 1.6rem var(--font-family-primary);
    cursor: pointer;
    transition: all 0.3s;

    &:hover,
    &:focus {
      outline: none;
      background-color: var(--color-primary-darker);
    }
  }
}

.hidden {
  visibility: hidden;
  opacity: 0;
}

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