/* Import font */
@import url("https://fonts.googleapis.com/css2?family=Oxygen+Mono&family=Oxygen:wght@400;700&display=swap");

/* CSS Variables */
:root {
  /* CSS HEX */
  --light-color: #f5f5f7;
  --primary-color: #008fec;
  --primary-light-color: #00adff;
  --text-color: #042a4d;
  --text-light-color: #b6e1ff;
  --s-size: 1.3rem;
  --m-size: 1.6rem;
  --l-size: 2rem;
  --xl-size: 2.6rem;
  --xxl-size: 5.2rem;
  --border-radius: 10px;
  --sans: "Oxygen", sans-serif;
  --mono: "Oxygen Mono", monospace;
  --box-shadow: rgba(50, 50, 93, 0.25) 0px 50px 100px -20px,
    rgba(0, 0, 0, 0.3) 0px 30px 60px -30px;
  --box-shadow-bottom-only: rgba(0, 0, 0, 0.09) 0px 2px 1px,
    rgba(0, 0, 0, 0.09) 0px 4px 2px, rgba(0, 0, 0, 0.09) 0px 8px 4px,
    rgba(0, 0, 0, 0.09) 0px 16px 8px, rgba(0, 0, 0, 0.09) 0px 32px 16px;
  --header-height: 60px;
}

html {
  box-sizing: border-box;
  font-size: 62.5%;
  scroll-behavior: smooth;
}

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

body {
  padding: 0;
  margin: 0;
  font-family: var(--sans);
  font-size: var(--m-size);
  background: var(--light-color);
  color: var(--text-color);
  background-color: #00adff;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100%25' height='100%25' viewBox='0 0 1600 800'%3E%3Cg %3E%3Cpath fill='%236ebefd' d='M486 705.8c-109.3-21.8-223.4-32.2-335.3-19.4C99.5 692.1 49 703 0 719.8V800h843.8c-115.9-33.2-230.8-68.1-347.6-92.2C492.8 707.1 489.4 706.5 486 705.8z'/%3E%3Cpath fill='%239bcdfc' d='M1600 0H0v719.8c49-16.8 99.5-27.8 150.7-33.5c111.9-12.7 226-2.4 335.3 19.4c3.4 0.7 6.8 1.4 10.2 2c116.8 24 231.7 59 347.6 92.2H1600V0z'/%3E%3Cpath fill='%23bedbfa' d='M478.4 581c3.2 0.8 6.4 1.7 9.5 2.5c196.2 52.5 388.7 133.5 593.5 176.6c174.2 36.6 349.5 29.2 518.6-10.2V0H0v574.9c52.3-17.6 106.5-27.7 161.1-30.9C268.4 537.4 375.7 554.2 478.4 581z'/%3E%3Cpath fill='%23dbe8f9' d='M0 0v429.4c55.6-18.4 113.5-27.3 171.4-27.7c102.8-0.8 203.2 22.7 299.3 54.5c3 1 5.9 2 8.9 3c183.6 62 365.7 146.1 562.4 192.1c186.7 43.7 376.3 34.4 557.9-12.6V0H0z'/%3E%3Cpath fill='%23F5F5F7' d='M181.8 259.4c98.2 6 191.9 35.2 281.3 72.1c2.8 1.1 5.5 2.3 8.3 3.4c171 71.6 342.7 158.5 531.3 207.7c198.8 51.8 403.4 40.8 597.3-14.8V0H0v283.2C59 263.6 120.6 255.7 181.8 259.4z'/%3E%3Cpath fill='%23f5f5f7' d='M1600 0H0v136.3c62.3-20.9 127.7-27.5 192.2-19.2c93.6 12.1 180.5 47.7 263.3 89.6c2.6 1.3 5.1 2.6 7.7 3.9c158.4 81.1 319.7 170.9 500.3 223.2c210.5 61 430.8 49 636.6-16.6V0z'/%3E%3Cpath fill='%23f5f5f7' d='M454.9 86.3C600.7 177 751.6 269.3 924.1 325c208.6 67.4 431.3 60.8 637.9-5.3c12.8-4.1 25.4-8.4 38.1-12.9V0H288.1c56 21.3 108.7 50.6 159.7 82C450.2 83.4 452.5 84.9 454.9 86.3z'/%3E%3Cpath fill='%23f5f5f7' d='M1600 0H498c118.1 85.8 243.5 164.5 386.8 216.2c191.8 69.2 400 74.7 595 21.1c40.8-11.2 81.1-25.2 120.3-41.7V0z'/%3E%3Cpath fill='%23f5f5f7' d='M1397.5 154.8c47.2-10.6 93.6-25.3 138.6-43.8c21.7-8.9 43-18.8 63.9-29.5V0H643.4c62.9 41.7 129.7 78.2 202.1 107.4C1020.4 178.1 1214.2 196.1 1397.5 154.8z'/%3E%3Cpath fill='%23F5F5F7' d='M1315.3 72.4c75.3-12.6 148.9-37.1 216.8-72.4h-723C966.8 71 1144.7 101 1315.3 72.4z'/%3E%3C/g%3E%3C/svg%3E");
  background-size: cover;
}

h1,
h2,
h3 {
  margin: 0;
}

a {
  color: var(--primary-color);
  font-weight: 700;
}
a:hover {
  color: var(--primary-light-color);
  text-decoration: none;
}

.btn {
  font-size: var(--m-size);
  border-radius: var(--border-radius);
  background-color: var(--text-color);
  color: var(--light-color);
  border: none;
}

.image img {
  display: block;
  width: 85%;
  margin: 50px auto;
  border-radius: var(--border-radius);
}

/* KEYFRAMES */
@keyframes popup {
  from {
    transform: scale(0);
  }
  to {
    transform: scale(1);
  }
}

/* SCROLL TOP */
#scroll-top {
  display: none;
  position: fixed;
  bottom: -30px;
  right: 30px;
  font-size: var(--m-size);
  opacity: 0.8;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 99;
}
#scroll-top.show {
  bottom: 30px;
  visibility: unset;
}

#scroll-top:hover {
  color: var(--light-color);
}
#scroll-top i {
  padding: 1rem;
}

/* NAV BAR */
header {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--light-color);
  box-shadow: var(--box-shadow-bottom-only);
  z-index: 100;
}

header a {
  text-decoration: none;
}

#nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

#nav #nav__lists {
  position: fixed;
  left: 0;
  top: calc(-1 * (var(--header-height) + 100%));
  width: 100%;
  padding: 20px;
  background-color: var(--light-color);
  font-family: var(--mono);
  list-style: none;
  margin: 0;
  text-align: center;
  transition: top 0.3s ease;
  box-shadow: var(--box-shadow-bottom-only);
  border-bottom-left-radius: var(--border-radius);
  border-bottom-right-radius: var(--border-radius);
}

#nav #nav__lists.show {
  top: var(--header-height);
}

#nav #nav__lists .nav__item {
  margin: 20px 0;
}

#nav #nav__toggle i {
  font-size: var(--xl-size);
}

#nav #nav__toggle.open .bx-menu,
#nav #nav__toggle .bx-x {
  display: block;
  animation: popup 0.3s ease;
}

#nav #nav__toggle .bx-menu,
#nav #nav__toggle.open .bx-x {
  display: none;
}

/* CONTAINER */
.container {
  width: min(100% - 30px, 960px);
  padding: 10px;
  margin: 0 auto;
}

#intro,
#contact {
  padding: 80px 0;
}

/* INTRO */

#intro .intro__desc .name {
  font-family: var(--mono);
}
#intro .intro__desc .name span {
  display: block;
  font-family: var(--sans);
  font-size: var(--xxl-size);
  font-weight: bold;
  color: var(--primary-color);
}

#intro .image {
  width: min(100% - 30px, 960px);
  text-align: center;
}

/* CONTACT */
#contact .title {
  font-size: var(--xl-size);
  text-align: center;
  margin: 20px 0;
}

#contact .contact__info {
  margin-top: 50px;
}

#contact .contact__info address {
  font-style: normal;
}

#contact .contact__info .zalo_qr {
  box-shadow: var(--box-shadow);
}

#contact #form-register {
  display: block;
  background-color: var(--light-color);
  padding: 30px;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

#form-register .form-group {
  padding: 10px 0;
}

#form-register .form-group label {
  display: block;
  margin-bottom: 5px;
}

#form-register .form-group .form-input {
  display: block;
  background-color: var(--light-color);
  color: var(--text-color);
  width: 100%;
  height: 35px;
  font-size: var(--m-size);
  padding: 0 5px;
  border-radius: var(--border-radius);
  outline: none;
  border: 2px var(--primary-color) solid;
}

#form-register .form-group .form-input:focus {
  border-color: var(--primary-light-color);
}

#form-register .form-group textarea.form-input {
  height: 150px;
  padding: 5px;
}

#form-register .form-btn {
  display: block;
  width: 200px;
  height: 35px;
  margin: 0 auto;
  margin-top: 20px;
  transition: background-color 0.3s ease-in-out;
}

#form-register .form-btn:hover {
  background-color: var(--primary-color);
}

@media only screen and (min-width: 960px) {
  /* SCROLL TOP */
  #scroll-top {
    display: block;
  }
  /* NAV BAR */
  #nav #nav__lists {
    position: unset;
    top: unset;
    left: unset;
    width: unset;
    padding: 0;
    display: flex;
    gap: 30px;
    border-radius: unset;
    box-shadow: unset;
    text-align: unset;
  }

  #nav #nav__lists .nav__item {
    margin: 0;
  }

  #nav #nav__toggle {
    display: none;
  }

  /* INTRO */
  #intro,
  #contact {
    display: flex;
    gap: 20px;
  }
  #contact {
    flex-direction: row;
  }

  #intro {
    align-items: center;
  }

  #contact .contact__info,
  #contact .contact__form {
    flex: 1;
  }

  #contact .contact__info {
    margin-top: 0;
    text-align: center;
  }

  #contact .contact__info .image img {
    width: 50%;
  }
}