:root {
  --laptop_rate: 100%;
  --mobile_rate: 50%;
  --main-font: "Noto Serif";
  --hero-font-h1: "Nunito";
  --hero-font-p: "Itim";
  --h1_font_size: 30px;
  --h2_font_size: 18px;
}

/*--------------------------------------------------------------
# General
--------------------------------------------------------------*/

body {
  font-family: var(--main-font), serif;
  color: #292727;
  width: 100%;
  height: 100%;
}

a {
  color: #149ddd;
  text-decoration: none;
}

a:hover {
  color: #b2def3;
  text-decoration: none;
}

/* Heading */

h1,
h2,
h3,
h4,
h5,
h6,
p,
ul,
i,
li {
  font-family: var(--main-font), serif;
}

/*==================================================================================================
/* các quy tắc CSS cho máy tính để bàn ở đây *
/*=================================================================================================*/

@media only screen and (min-width: 768px) {
  #main {
    margin-left: 250px;
  }
  #footer {
    position: static;
    width: auto;
    /* padding-right: 0px 15px; */
  }
  #hero {
    background-attachment: relative;
  }

  /*--------------------------------------------------------------
  # Header
  --------------------------------------------------------------*/

  #header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 260px;
    transition: all ease-in-out 0.5s;
    z-index: 9997;
    transition: all 0.5s;
    padding: 0 15px;
    background: #040b14;
    overflow-y: auto;
    border-right: 2px solid #040b14;
  }

  #header .profile img {
    display: block;
    margin: 15px auto;
    width: 120px;
    border: 8px solid #2c2f3f;
  }

  #header .profile img:hover {
    border: 8px solid #149ddd;
  }

  #header .profile h1 {
    font-size: var(--h1_font_size);
    margin: 0;
    padding: 0;
    font-weight: 600;
    -moz-text-align-last: center;
    text-align-last: center;
  }

  #header .profile h1 a {
    color: rgb(167, 167, 167);
    text-decoration: none;
  }

  #header .profile h1 a:hover {
    color: #149ddd;
    text-decoration: none;
  }

  #header .profile .social-links a {
    font-size: 18px;
    display: inline-block;
    background: #212431;
    color: #fff;
    line-height: 2;
    padding: 4px 0;
    margin-right: 4px;
    border-radius: 50%;
    text-align: center;
    width: 25px;
    height: 25px;
    transition: 0.5s;
  }

  #header .profile .social-links a:hover {
    background: #149ddd;
    color: #fff;
    text-decoration: none;
    display: inline-block;
    width: 40px;
    height: 40px;
    padding: 10px 0;
  }

  /*--------------------------------------------------------------
  # Hero Section
  --------------------------------------------------------------*/

  #hero {
    width: 100%;
    height: 100vh;
    background: url("../img/hero.jpg") center;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
  }

  #hero:before {
    content: "";
    background: rgba(5, 13, 24, 0.3);
    position: absolute;
    bottom: 0;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1;
  }

  #hero .hero-container {
    position: relative;
    z-index: 3;
    min-width: 260px;
  }

  #hero h1 {
    font-family: var(--hero-font-h1), sans-serif;
    font-size: 80px;
    font-weight: 700;
    line-height: 56px;
    margin: 0 0 10px 0;
    color: #fff;
  }

  #hero p {
    font-family: var(--hero-font-p), cursive;
    font-size: 40px;
    font-weight: 600;
    margin-bottom: 50px;
    color: #fff;
  }

  #hero p span {
    color: #fff;
    padding-bottom: 4px;
    letter-spacing: 1px;
  }

  /*--------------------------------------------------------------
  # About
  --------------------------------------------------------------*/

  .about .content h3 {
    font-weight: 500;
    font-size: 18px;
    font-style: italic;
    padding-bottom: 5px;
    color: #173b6c;
    margin-left: 15px;
  }

  .about .content img {
    position: relative;
    width: 180px;
    height: 250px;
    display: block;
    margin-right: 50px;
  }

  .about .item ul {
    list-style: none;
    padding-bottom: 10px;
  }

  .about .item ul li {
    font-weight: 400;
    font-size: 18px;
    padding-bottom: 10px;
  }

  .about .item ul i {
    font-size: 18px;
    padding-bottom: 10px;
    color: #149ddd;
  }

  .about .item ul b {
    font-size: 18px;
    padding-bottom: 10px;
    color: #e924f0;
  }

  /*--------------------------------------------------------------
  # Footer
  --------------------------------------------------------------*/

  #footer {
    padding: 5px;
    color: #f4f6fd;
    font-size: 14px;
    position: fixed;
    left: 0;
    bottom: 0;
    width: 260px;
    height: 50px;
    z-index: 9999;
    background: #040b14;
    border-top: 2px solid #040b14;
    border-right: 2px solid #040b14;
  }

  .footer-bg1 a {
    color: #040b14;
  }

  .footer-bg2 a {
    color: #fff;
  }

  #footer .copyright {
    text-align: center;
  }

  #footer .credits {
    padding-top: 5px;
    text-align: center;
    font-size: 13px;
    color: #eaebf0;
  }
}

/*==================================================================================================
/* các quy tắc CSS cho thiết bị di động ở đây *
/*=================================================================================================*/

@media only screen and (max-width: 767px) {
  /*--------------------------------------------------------------
  # Header
  --------------------------------------------------------------*/

  #header {
    top: 0;
    left: 0;
    bottom: 0;
    transition: all ease-in-out 0.5s;
    z-index: 9997;
    transition: all 0.5s;
    padding: 0 15px;
    background: #040b14;
    overflow-y: auto;
    border-right: 2px solid #040b14;
  }

  #header .profile img {
    display: block;
    margin: 15px auto;
    width: 80px;
    border: 2px solid #2c2f3f;
  }

  #header .profile img:hover {
    border: 2px solid #149ddd;
  }

  #header .profile h1 {
    font-size: var(--h1_font_size);
    margin: 0;
    padding: 0;
    font-weight: 600;
    -moz-text-align-last: center;
    text-align-last: center;
  }

  #header .profile h1 a {
    color: rgb(167, 167, 167);
    text-decoration: none;
  }

  #header .profile h1 a:hover {
    color: #149ddd;
    text-decoration: none;
  }

  #header .profile .social-links a {
    font-size: 18px;
    display: inline-block;
    background: #212431;
    color: #fff;
    line-height: 2;
    padding: 4px 0;
    margin-right: 4px;
    border-radius: 50%;
    text-align: center;
    width: 25px;
    height: 25px;
    transition: 0.5s;
  }

  #header .profile .social-links a:hover {
    background: #149ddd;
    color: #fff;
    text-decoration: none;
    display: inline-block;
    width: 40px;
    height: 40px;
    padding: 10px 0;
  }

  /*--------------------------------------------------------------
  # Hero Section
  --------------------------------------------------------------*/

  #hero {
    width: 100%;
    height: 38vh;
    background: url("../img/hero.jpg") center;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
  }

  /* #hero:before {
    content: "";
    background: rgba(5, 13, 24, 0.3);
    position: absolute;
    bottom: 0;
    top: 0;
    left: 0;
    right: 0;
    z-index: 0;
  } */

  #hero .hero-container {
    position: relative;
    z-index: 3;
    min-width: 260px;
  }

  #hero h1 {
    font-family: var(--hero-font-h1), sans-serif;
    font-size: 35px;
    font-weight: 700;
    line-height: 25px;
    margin: 0 0 5px 0;
    color: #fff;
  }

  #hero p {
    font-family: var(--hero-font-p), cursive;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 0px;
    color: #fff;
  }

  #hero p span {
    color: #fff;
    padding-bottom: 4px;
    letter-spacing: 1px;
  }

  /*--------------------------------------------------------------
  # About
  --------------------------------------------------------------*/

  .about .content h3 {
    font-weight: 500;
    font-size: 16px;
    font-style: italic;
    padding-bottom: 5px;
    color: #173b6c;
    margin-left: 10px;
  }

  .about .content img {
    position: relative;
    right: 130px;
    width: 110px;
    height: 150px;
    display: inline-block;
  }

  .about .item ul {
    list-style: none;
    padding-bottom: 10px;
  }

  .about .item ul li {
    font-weight: 400;
    font-size: 18px;
    padding-bottom: 10px;
  }

  .about .item ul i {
    font-size: 18px;
    padding-bottom: 10px;
    color: #149ddd;
  }

  .about .item ul b {
    font-size: 18px;
    padding-bottom: 10px;
    color: #e924f0;
  }

  /*--------------------------------------------------------------
  # Footer
  --------------------------------------------------------------*/

  #footer {
    padding: 5px;
    color: #f4f6fd;
    font-size: 14px;
    left: 0;
    bottom: 0;
    width: 400px;
    height: 50px;
    z-index: 9999;
    background: #040b14;
    border-top: 2px solid #040b14;
    border-right: 2px solid #040b14;

    position: fixed;
    right: 5px;
    transition: display 0.5s ease-in-out;
    z-index: 99999;
  }

  .footer-bg1 a {
    color: #040b14;
  }

  .footer-bg2 a {
    color: #fff;
  }

  #footer .copyright {
    text-align: center;
  }

  #footer .credits {
    padding-top: 5px;
    text-align: center;
    font-size: 13px;
    color: #eaebf0;
  }
}

@media (prefers-reduced-motion: no-preference) {
  :root {
    scroll-behavior: auto;
  }
}

/*==================================================================================================
/*Hiển thị chung
/*==================================================================================================

/*--------------------------------------------------------------
# Navigation Menu
--------------------------------------------------------------*/

.nav-menu {
  padding-top: 30px;
  padding-left: 20px;
}

.nav-menu * {
  margin: 0;
  padding: 0px;
  list-style: none;
}

.nav-menu > ul > li {
  position: relative;
  white-space: nowrap;
}

.nav-menu a {
  display: flex;
  align-items: center;
  color: #a8a9b4;
  padding: 5px 15px;
  margin-bottom: 8px;
  transition: 0.3s;
  font-size: 18px;
}

.nav-menu a i {
  font-size: 25px;
  padding-right: 8px;
  color: #6f7180;
}

.nav-menu a:hover,
.nav-menu .active > a,
.nav-menu li:hover > a {
  text-decoration: none;
  color: #149ddd;
  font-weight: 700;
  padding-left: 40px;
}

.nav-menu a:hover i,
.nav-menu .active > a i,
.nav-menu li:hover > a i {
  color: #149ddd;
}

/*--------------------------------------------------------------
# Sections General
--------------------------------------------------------------*/

section {
  padding: 30px 0;
  overflow: hidden;
}

.section-background {
  background: #6496ec;
}

.section-title {
  padding-top: -20px;
  padding-bottom: 10px;
}

.section-title h2 {
  font-size: 32px;
  font-weight: bold;
  margin-bottom: 20px;
  padding-bottom: 20px;
  position: relative;
  color: #173b6c;
  left: 10px;
}

.section-title h2::after {
  content: "";
  position: absolute;
  display: block;
  width: 100px;
  height: 5px;
  background: #dd1414;
  bottom: 0;
  left: 5px;
}

.section-title p {
  font-size: 18px;
  font-weight: bold;
  font-style: italic;
  margin-bottom: 10px;
  margin-left: 15px;
}

/*--------------------------------------------------------------
# Education
--------------------------------------------------------------*/

.education h4 {
  font-weight: 700;
  font-size: 22px;
  color: #173b6c;
  padding-bottom: 10px;
  padding-top: 10px;
  margin-left: 15px;
}

.education .education-item p i {
  font-size: 20px;
  padding-bottom: 10px;
  padding-right: 2px;
  color: #149ddd;
  margin-left: 15px;
}

.skill .iconfont {
  padding-left: 15px;
}

/*--------------------------------------------------------------
# Experience
--------------------------------------------------------------*/

.experience .experience-item {
  padding: 0 0 20px 20px;
  margin-top: 0px;
  margin-left: 15px;
  border-left: 4px solid #1f5297;
  position: relative;
}

.experience .experience-item h4 {
  line-height: 18px;
  font-size: 18px;
  font-weight: 700;
  text-transform: uppercase;
  color: #050d18;
  margin-bottom: 10px;
}

.experience .experience-item p a {
  font-size: 17px;
  font-style: bold;
  font-weight: 550;
}

.experience .experience-item p b {
  font-size: 16px;
  font-style: italic;
  font-weight: 400;
  margin-top: -2px;
  border-bottom: 2px solid #ffae00;
  position: relative;
}

.experience .experience-item ul {
  padding-left: 20px;
}

.experience .experience-item ul li {
  padding-bottom: 10px;
}

.experience .experience-item:last-child {
  padding-bottom: 0;
}

.experience .experience-item::before {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 120px;
  left: -10px;
  top: 0;
  background: rgb(28, 145, 255);
  border: 3px solid #45abff;
}

.experience h5 {
  font-size: 18px;
  background: #e4edf9;
  padding: 5px 5px;
  font-weight: 700;
  margin-bottom: 10px;
  position: relative;
  text-align: center;
}

/*--------------------------------------------------------------
# Achieve
--------------------------------------------------------------*/

.achieve .title {
  margin-left: 100px;
  margin-bottom: 15px;
}

.achieve .title a {
  color: #343a40;
  font-size: 20px;
  font-weight: 700;
}

.achieve .title a:hover {
  color: #149ddd;
}

.achieve .title b {
  color: #343a40;
  font-size: 15px;
  font-weight: 500;
}

.achieve .title b:hover {
  color: #149ddd;
  font-size: 15px;
  font-weight: 800;
}

.achieve .icon-box {
  margin-bottom: 20px;
}

.achieve .icon {
  float: left;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: #149ddd;
  border-radius: 50%;
  transition: 0.5s;
  border: 1px solid #149ddd;
  margin-left: 25px;
}

.achieve .icon i {
  color: #fff;
  font-size: 24px;
}

.achieve .icon-box:hover .icon {
  background: #fff;
}

.achieve .icon-box:hover .icon i {
  color: #149ddd;
}

/*--------------------------------------------------------------
# Interest
--------------------------------------------------------------*/

.interest .interest-item {
  margin-bottom: 30px;
}

.interest .interest-item p i {
  padding-bottom: 10px;
}

.interest .interest-item p i {
  font-size: 22px;
  padding-right: 5px;
  color: #149ddd;
}

/*--------------------------------------------------------------
# Contact
--------------------------------------------------------------*/

.contact {
  padding-bottom: 110px;
}

.contact .info {
  padding: 10px;
  background: #fff;
  width: 100%;
  box-shadow: 0 0 24px 0 rgba(0, 0, 0, 0.12);
}

.contact .info i {
  font-size: 15px;
  color: #149ddd;
  float: left;
  width: 44px;
  height: 44px;
  background: #dff3fc;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50px;
  transition: all 0.3s ease-in-out;
}

.contact .info h4 {
  padding: 0 0 0 60px;
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 5px;
  color: #050d18;
}

.contact .info p {
  padding: 0 0 10px 60px;
  margin-bottom: 0px;
  font-size: 14px;
  color: #173b6c;
}

.contact .info .email p {
  padding-top: 0px;
}

.contact .info .social-links {
  padding-left: 60px;
}

.contact .info .blog a {
  font-weight: 900;
  padding-left: 15px;
}

.contact .info .social-links a {
  font-size: 18px;
  display: inline-block;
  background: #333;
  color: #fff;
  line-height: 1;
  padding: 8px 0;
  border-radius: 50%;
  text-align: center;
  width: 36px;
  height: 36px;
  transition: 0.3s;
  margin-right: 10px;
}

.contact .info .social-links a:hover {
  background: #149ddd;
  color: #fff;
}

.contact .info .email:hover i,
.contact .info .address:hover i,
.contact .info .phone:hover i,
.contact .info .zalo:hover i,
.contact .info .blog:hover i {
  background: #149ddd;
  color: #fff;
}

/*--------------------------------------------------------------
# Tootip
--------------------------------------------------------------*/

.tooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px dotted rgb(109, 108, 108);
}

.tooltip .tooltiptext {
  visibility: hidden;
  width: 120px;
  background-color: rgb(146, 230, 245);
  color: rgb(255, 255, 255);
  text-align: center;
  border-radius: 6px;
  padding: 5px 0;
  position: absolute;
  z-index: 1;
  bottom: 100%;
  left: 50%;
  margin-left: -60px;
  opacity: 0;
  transition: opacity 1s;
}

.tooltip:hover .tooltiptext {
  visibility: visible;
  opacity: 1;
}

/*--------------------------------------------------------------
# Modal
--------------------------------------------------------------*/

.modal-content {
  display: none;
  /* Hidden by default */
  position: fixed;
  /* Stay in place */
  z-index: 1;
  /* Sit on top */
  padding-top: 10px;
  /* Location of the box */
  left: 0;
  top: 0;
  width: 100%;
  /* Full width */
  height: 100%;
  /* Full height */
  overflow: auto;
  /* Enable scroll if needed */
  background-color: rgb(0, 0, 0);
  /* Fallback color */
  background-color: rgba(0, 0, 0, 0.4);
  /* Black w/ opacity */
}

.modal-body {
  background-color: #f7fdfc;
  margin: auto;
  padding: 10px;
  border: 1px solid #888;
  width: 100%;
}

/* Close Button */
.close {
  color: #aaaaaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover,
.close:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}

/*--------------------------------------------------------------
# bg-change button
--------------------------------------------------------------*/

.bg-change {
  position: relative;
  width: 20px;
  height: 20px;
  bottom: -5px;
  left: 5px;
  border-radius: 60px;
  background: #147cdd;
  color: #fff;
  transition: display 0.5s ease-in-out;
}

.bg-change:hover {
  color: #fff;
  background: #ffffff;
  transition: background 0.2s ease-in-out;
}

/*--------------------------------------------------------------
# Back-to-top button
--------------------------------------------------------------*/

.back-to-top {
  position: fixed;
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 50px;
  right: 5px;
  bottom: 5px;
  background: #149ddd;
  color: #fff;
  transition: display 0.5s ease-in-out;
  z-index: 99999;
}

.back-to-top i {
  font-size: 24px;
  position: absolute;
  top: 7px;
  left: 8px;
}

.back-to-top:hover {
  color: #fff;
  background: #2eafec;
  transition: background 0.2s ease-in-out;
}

/*--------------------------------------------------------------
# Toogle switch
--------------------------------------------------------------*/

.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 20px;
  bottom: 12.5px;
  left: 5px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: 0.4s;
  transition: 0.4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 15px;
  width: 15px;
  left: 5px;
  bottom: 2px;
  background-color: white;
  -webkit-transition: 0.4s;
  transition: 0.4s;
}

input:checked + .slider {
  background-color: #040b14;
}

input:focus + .slider {
  box-shadow: 0 0 1px #040b14;
}

input:checked + .slider:before {
  -webkit-transform: translateX(15px);
  -ms-transform: translateX(15px);
  transform: translateX(15px);
}

/* Rounded sliders */

.slider.round {
  border-radius: 15px;
}

.slider.round:before {
  border-radius: 50%;
}