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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: black;
    color: #e7e7e7;
    min-height: 100vh;
    line-height: 1.5;
}

.image-gradient{
    position: absolute;
    top: 0;
    right: 0;
    opacity: 0.5;
    z-index: -1;
}

.logo {
    font-weight: 600;
}

.layer-blur {
    height: 0;
    width: 30rem;
    position: absolute;
    top: 20%;
    right: 0;
    box-shadow: 0 0 700px 15px white;
    rotate: -30deg;
    z-index: -1;
}

.container {
    width: 100%;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    overflow: hidden;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5rem;
}

header h1 {
    margin: 0;
    font-size: 3rem;
    font-weight: 300;
}

nav {
    display: flex;
    align-items: center;
    gap: 3rem;
    margin-left: -5%;
}

nav a {
    font-size: 1rem;
    letter-spacing: 0.1rem;
    transition: color 0.2s ease;
    text-decoration: none;
    color: inherit;
    z-index: 999;
}

nav a:hover {
    color: #a7a7a7;
}

.btn-signing {
    background-color: #a7a7a7;
    color: black;
    padding: 0.8rem 2rem;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.2s ease;
    cursor: pointer;
    border-radius: 30px;
    z-index: 999;
}

.btn-signing:hover {
    background-color: white;
}

main {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: calc(90vh - 6rem);
}

.content {
    max-width: 40rem;
    margin-left: 10%;
    z-index: 999;
}

.tag-box {
    position: relative;
    width: 18rem;
    height: 2.5rem;
    border-radius: 50px;
    background: linear-gradient(to right, #656565, #7f42a7, #6600c5, #5300a0, #757575, #656565);
    background-size: 200%;
    animation: animationGradient 2.5s linear infinite;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
}

@keyframes animationGradient {
    to {
        background-position: 200%;
    }
}

.tag-box .tag {
    position: absolute;
    inset: 3px 3px 3px 3px;
    background-color: black;
    border-radius: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.5s ease;
    cursor: pointer;
}

.tag-box .tag:hover {
    color: #5300a0;
}

.content h1 {
    font-size: 4rem;
    font-weight: 600;
    letter-spacing: 0.1rem;
    margin: 2rem 0;
    line-height: 1.2;
    text-shadow: 0 0 10px rgba(128, 128, 128, 0.418);
}

.description {
    font-size: 1.2rem;
    letter-spacing: 0.05rem;
    max-width: 35rem;
    color: gray;
}

.buttons {
    display: flex;
    gap: 1rem;
    margin-top: 3rem;
}

:root {
    /*========== Colors ==========*/
    /*Color mode HSL(hue, saturation, lightness)*/
    --body-color: #393937;
    --accent-color: #03e9f4;
    --white-color: #fff;
    --box-shadow: 0 0 5px #03e9f4, 0 0 25px #03e9f4, 0 0 50px #03e9f4,
      0 0 100px #03e9f4;
  
    /*========== Font and typography ==========*/
    /*.5rem = 8px | 1rem = 16px ...*/
    --body-font: "Montserrat", sans-serif;
    --normal-font-size: 1rem;
  
    /*========== Font weight ==========*/
    --font-regular: 200;
    --font-semi-bold: 300;
  
    /*========== z index ==========*/
    --z-tooltip: 10;
    --z-fixed: 100;
  }

  ul {
    list-style: none;
  }
  
  a {
    text-decoration: none;
  }
  
  .button-animation {
    position: relative;
    display: inline-block;
    padding: 20px 30px;
    color: var(--accent-color);
    text-transform: uppercase;
    overflow: hidden;
    letter-spacing: 4px;
    transition: 0.5s;
    border-radius: 50px;
    span {
      position: absolute;
      display: block;
    }
    margin-bottom: 100px;
    border-style: solid;
    color: var(--white-color);
  
    span:nth-child(1) {
      top: 0;
      left: -100%;
      width: 50%;
      height: 1px;
      background: linear-gradient(90deg, transparent,var(--accent-color));
      animation: btn-anim1 2s linear infinite;
    }
    @keyframes btn-anim1 {
      0% {
        left: -50%;
      }
      50%,
      100% {
        left: 50%;
      }
    }
  
    span:nth-child(2) {
      top: -100%;
      right: 0;
      width: 2px;
      height: 100%;
      background: linear-gradient(180deg, transparent, var(--accent-color));
      animation: btn-anim2 2s linear infinite;
      animation-delay: 0.5s;
      
    }
    @keyframes btn-anim2 {
      0% {
        top: -100%;
      }
      50%,
      100% {
        top: 100%;
      }
    }
  
    span:nth-child(3) {
      bottom: 0;
      right: -100%;
      width: 100%;
      height: 2px;
      background: linear-gradient(360deg, transparent, var(--accent-color));
      animation: btn-anim3 1s linear infinite;
      animation-delay: 0.5s;
      
    }
    @keyframes btn-anim3 {
      0% {
        right: -100%;
      }
      50%,
      100% {
        right: 100%;
      }
    }
  
    span:nth-child(4) {
      bottom: -100%;
      left: 0;
      width: 2px;
      height: 100%;
      background: linear-gradient(360deg, transparent, var(--accent-color));
      animation: btn-anim4 1s linear infinite;
      animation-delay: 0.75s;
      
    }
  
    @keyframes btn-anim4 {
      0% {
        bottom: -100%;
      }
      50%,
      100% {
        bottom: 100%;
      }
    }
  
    &:hover {
      background-color: var(--accent-color);
      color: var(--black-color);
      border-radius: 5px;
      box-shadow: var(--box-shadow);
      border-radius: 50px;
      color: black;
    }
  }
  

.btn-get-started {
    text-decoration: none;
    border: 1px solid #2a2a2a;
    padding: 0.7rem 1.2rem;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.1rem;
    transition: background-color 0.2s ease;
}

.btn-get-started:hover {
    background-color: #1a1a1a;
}

.btn-signing-main {
    text-decoration: none;
    background-color: lightgray;
    color: black;
    padding: 0.6rem 2.5rem;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.1rem;
    transition: background-color 0.2 ease;
}

.btn-signing-main:hover {
    background-color: gray;
}

.robot-3d {
    position: absolute;
    top: 0;
    right: -20%;
}

/* Tablet Response */
@media (max-width: 1300px) {
    header {
        padding: 1rem 0.5rem;
    }

    .content {
        margin-top: 85%;
    }

    .robot-3d {
        scale: 0.8;
        top: -20%;
        right: 2%;
    }
}

/* Mobile Response */
@media (max-width: 768px) {
    header {
        padding: 1rem 0.1rem;
    }

    nav {
        display: none;
    }

    header h1 {
        font-size: 2rem;
    }

    .btn-signing {
        padding: 0.6rem 1.5rem;
    }

    .content {
        margin-top: 25rem;
    }

    .robot-3d {
        scale: 0.4;
        top: -25%;
        right: 0%;
        background-size: cover;
    }

    .content h1 {
        max-width: 30rem;
        margin-left: 10%;
    }

    .tag-box {
        width: 12rem;
    }

    .content h1 {
        font-size: 2.5rem;
    }

    .description {
        font-size: 1rem;
    }

    .btn-get-started {
        padding: 0.5rem 1.2rem;
        font-size: 0.8rem;
    }

    .btn-signing-main {
        padding: 0.5rem 2rem;
        font-size: 0.8rem;
    }
}