* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  text-decoration: none;
  border: none;
  outline: none;
  scroll-behavior: smooth;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 28.05px;
}

:root {
  --bg-color: #000000 !important;
  --second-bg-color: #000000;
  --text-color: #000;
  --main-color: #00fefb;
  /* --main-main: linear-gradient(90deg, #3322ae 0%, #d5489c 100%); */
}

html {
  font-size: 62.5%;
  overflow-x: hidden;
}

body {
  background: var(--bg-color);
  color: var(--text-color);
}

section {
  min-height: 74vh;
  padding: 2rem 9% 1.5rem;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 2rem 9%;
  background: #000000;
  color: #00fefb;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
}

.home img {
  width: 100vw;
}

.course {
  color: #ffffff;
}

.header.sticky {
  border-bottom: .1rem solid rgba(0, 0, 0, .2);
}

.logo {
  font-size: 2.5rem;
  color: var(--text-color);
  font-weight: 600;
  cursor: default;
}

.navbar a {
  font-size: 1.7rem;
  color: #fff;
  margin-left: 4rem;
  font-weight: bold;
}

.navbar a:hover,
.navbar a.active {
  color: #ffff00;
}

#menu-icon {
  font-size: 3.6rem;
  color: var(--text-color);
  display: none;
}

.home {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #000000;

}

.home-img img {
  width: 35vw;
}

.home-content h3 {
  font-size: 3.2rem;
  font-weight: 700;
}

.home-content h3:nth-of-type(2) {
  margin-bottom: 2rem;
}

span {
  color: #ffff00;
}

.home-content h1 {
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1.3;
}

.home-content p {
  font-size: 1.6rem;
}

.social-media a {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 4rem;
  height: 4rem;
  background: transparent;
  border: .2rem solid var(--main-color);
  border-radius: 50%;
  font-size: 2rem;
  color: var(--main-color);
  margin: .5rem 1rem .5rem 1rem;
  transition: .5s ease;
}

.social-media a:hover {
  background: var(--main-color);
  color: var(--second-bg-color);
  box-shadow: 0 0 1rem var(--main-color);
}

.btn {
  display: inline-block;
  padding: 2rem 3.8rem;
  background: #ffffff;
  border-radius: 4rem;
  font-size: 1.6rem;
  color: var(--second-bg-color);
  letter-spacing: .1rem;
  font-weight: 600;
  transition: .5s ease;
}

.btn-header {
  display: inline-block;
  padding: 1rem 2.8rem;
  background: #ffffff;
  border-radius: 4rem;
  font-size: 1.6rem;
  color: var(--second-bg-color);
  letter-spacing: .1rem;
  font-weight: 600;
  transition: .5s ease;
}


.btn:hover {
  box-shadow: none;
}

.about {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  background: var(--second-bg-color);
}

.about-img img {
  width: 35vw;
}

.heading {
  text-align: center;
  font-size: 4.5rem;
}


.service h2 {
  margin-bottom: 2rem;
}

.service-container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
  background: #000000;
}

.service-container .service-box {
  flex: 1 1 30rem;
  background: var(--second-bg-color);
  padding: 3rem 2rem 4rem;
  border-radius: 2rem;
  text-align: center;
  border: .3rem solid #00fefb;
  transition: .5s ease;
}

.service-container .service-box:hover {
  border-color: #00fefb;
  ;
  transform: scale(1.02);
}

.join-group .service-box {
  flex: 1 1 30rem;
  background: var(--second-bg-color);
  padding: 3rem 2rem 4rem;
  border-radius: 2rem;
  text-align: center;
  border: .3rem solid #00fefb;
  transition: .5s ease;
}

.service-box i {
  font-size: 3rem;
  color: #00fefb;
}

.service-box h3 {
  font-size: 2.6rem;
}

.service-box p {
  font-size: 1.6rem;
  margin: 1rem 0 3rem;
}


.contact form {
  max-width: 70rem;
  margin: 1rem auto;
  text-align: center;
  margin-bottom: 3rem;
}

.contact form .input-box {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

.contact form .input-box input,
.contact form textarea {
  width: 100%;
  padding: 1.5rem;
  font-size: 1.6rem;
  color: var(--text-color);
  background: var(--second-bg-color);
  border-radius: .8rem;
  margin: .7rem 0;
}

.contact form .input-box input {
  width: 49%;
}

.contact form textarea {
  resize: none;
}

.contact form .btn {
  margin-top: 2rem;
  cursor: pointer;
}

.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  padding: 2rem 9%;
  background: var(--second-bg-color);
}

.main-tiknet {
  padding: 8.2% 12% 0;
}

.main-home {
  padding: 12% 12% 0;
}

.main-home-new {
  padding: 0 12% 0 !important;
}

.main-policy {
  padding: 0.1% 20%;
}

.footer-text p {
  font-size: 1.6rem;
}

.footer-iconTop a {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  padding: .8rem;
  background: #fff;
  border-radius: .8rem;
  transition: .5s ease;
}

.footer-iconTop a:hover {
  box-shadow: 0 0 1rem var(--main-color);
}

.footer-iconTop a i {
  font-size: 2.4rem;
  color: #000;
}

.container {
  background: #000000;
  color: #ffffff;
}

.title1,
.title2,
.title3,
.title4,
.title5,
.title6 {
  font-size: 2.2rem;
  font-weight: bold;
  cursor: pointer;
  color: #ffffff;
  user-select: none;
}

.content1,
.content2,
.content3,
.content4,
.content5,
.content6 {
  display: none;
  margin-top: 5px;
}


.digi {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  background: #000000;
}

img {
  border: none;
  border-radius: 0;
  box-shadow: none;
  height: auto;
  /* padding: 1% 4%; */
  max-width: 100%;
}

.portfolio {
  background-color: var(--second-bg-color);
  background: #000000
}


.portfolio-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: center;
  gap: 2.5rem;
}

.portfolio-container .portfolio-box {
  position: relative;
  border-radius: .5rem;
  box-shadow: 0 0 1rem var(--bg-color);
  overflow: hidden;
  display: flex;
}


.text-center {
  text-align: center;
  font-size: 17px !important;
  font-weight: 400 !important;
  margin: 0px 0px 27.2px;
}


.text-center-left {
  text-align: left;
  font-size: 17px !important;
  font-weight: 400 !important;
  margin: 0px 0px 27.2px;
}

.text-start {
  font-size: 17px !important;
  font-weight: 400 !important;
  margin: 0px 0px 27.2px;
}

.parent {
  display: flex;
  justify-content: center;
  /* Căn giữa theo chiều ngang */
  align-items: center;
  /* Căn giữa theo chiều dọc */
}

.strikethrough {
  font-size: 32px;
  font-weight: bold;
  color: white;
  text-decoration: line-through;
}



.clock {
  font-size: 48px;
  font-weight: bold;
  /* background: #000; */
  color: #ffff00;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0px 0px 10px rgba(255, 255, 255, 0.3);
  text-align: center;
}


.email-section {
  max-width: 600px;
  margin: 50px auto;
  padding: 20px;
  text-align: center;
  background-color: #f9f9f9;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

#emailForm {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 20px;
}

#email {
  padding: 12px;
  width: 300px;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 16px;
}

button[type="submit"] {
  padding: 12px 25px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button[type="submit"]:hover {
  background-color: #45a049;
}

#emailForm input {
  font-size: 19px !important;
}

form button {
  font-size: 22px !important;
  font-weight: bold !important;
}




/* Break Point Reponsive */
@media (max-width: 1200px) {
  .main-tiknet {
    padding: 10.2% 12% 0;
  }

  .main-home {
    padding: 14% 12% 0;
    ;
  }

  section {
    min-height: 20vh;
  }

  .main-home-new {
    padding: 0 12% 0 !important;
  }


  html {
    font-size: 55%;
  }
}

@media (max-width: 991px) {
  .main-tiknet {
    padding: 10.2% 10% 0;
  }

  section {
    min-height: 20vh;
  }

  .main-home {
    padding: 16% 10% 0;
    ;
  }

  .main-home-new {
    padding: 0 10% 0 !important;
  }

  .main-policy {
    padding: 0.1% 5%;
  }

  .header {
    padding: 2rem 3%;
  }

  section {
    padding: 1rem 3% 1.5rem;
  }

  .service {
    padding-bottom: 1rem;
  }


  .contact {
    min-height: auto;
  }

  .footer {
    padding: 2rem 3%;
  }
}

@media (max-width: 768px) {
  .main-tiknet {
    padding: 13.2% 5% 0;
  }

  section {
    min-height: 20vh;
  }

  .main-home {
    padding: 18% 5% 0;
  }

  .main-home-new {
    padding: 0 5% 0 !important;
  }



  .main-policy {
    padding: 0.1% 5%;
  }

  .portfolio-container {
    display: flex;
    flex-direction: column-reverse;
  }

  #menu-icon {
    display: block;
  }

  .navbar {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    padding: 1rem 3%;
    background: var(--bg-color);
    border-top: .1rem solid rgba(0, 0, 0, .2);
    box-shadow: 0 .5rem 1rem rgba(0, 0, 0, .2);
    display: none;
  }

  .navbar.active {
    display: block;
  }

  .navbar a {
    color: #000;
    display: block;
    font-size: 2rem;
    margin: 3rem 0;

  }

  .home {
    flex-direction: column;
  }

  .home-content h3 {
    font-size: 2.6rem;
  }

  .home-content h1 {
    font-size: 2.6rem;
  }

  .home img {
    width: 100vw;
    margin-top: 4rem;
  }

  .about {
    flex-direction: column-reverse;
  }

  .about img {
    width: 100vw;
    margin-top: 4rem;
  }

  .service h2 {
    margin-bottom: 1rem;
  }

}

@media (max-width : 617px) {
  .main-tiknet {
    padding: 17.2% 4% 0;
  }

  section {
    min-height: 20vh;
  }

  .main-home {
    padding: 20% 3% 0;
    ;
  }

  .main-home-new {
    padding: 0 2% 0 !important;
  }

  .main-policy {
    padding: 0.1% 5%;
  }

  .portfolio-container {
    display: flex;
    flex-direction: column-reverse;
  }

}

@media (max-width : 450px) {
  html {
    font-size: 50%;
  }

  section {
    min-height: 20vh;
  }

  .main-tiknet {
    padding: 30.2% 3% 0;
  }

  #emailForm {
    flex-direction: column;
  }

  #email {
    width: 100%;
  }

  button[type="submit"] {
    width: 100%;
  }

  .main-policy {
    padding: 0.1% 5%;
  }

  .service-box .title-digi {
    margin: 0;
  }

  section {
    padding: 10rem 3% 1.5rem;
  }


  .service-container .service-box {
    padding: 4rem 2rem 1rem;
  }

  .social-media a {
    width: 6rem;
    height: 6rem;
  }

  .toado,
  .digi,
  .portfolio-container {
    display: flex;
    flex-direction: column-reverse;
  }

  .contact form .input-box input {
    width: 100%;
  }
}

.cost {
  font-size: 1.6rem;
  margin: 1rem 0 3rem;
  color: #dc3b2b;
  font-weight: bold;
  font-size: 40px;
}