:root {
  /* Màu sắc */
  --primary-color: #37a691;
  --secondary-color: #046e5a;
  --text-color: #656565;
  --text-dark: #444;
  --link-color: #428bca;
  --link-hover-color: #2c6dad;
  --footer-bg: #046e5a;
  --footer-sub-bg: #003e34;
  --footer-accent: #a2f3e4;
  --white: #ffffff;
  --gray-light: #f0f0f0;
  --gray-border: #e0e0e0;
  --error-color: #e74c3c;

  /* Font-size */
  --font-small: 12px;
  --font-medium: 15px;
  --font-large: 17px;
  --font-heading-small: 20px;
  --font-heading-medium: 26px;
  --font-heading-large: 28px;
  --font-heading-xl: 30px;
  --font-heading-xxl: 40px;
}

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

html {
  font-family: sans-serif;
}

.darkMode {
  --white: #1a1a1a;
  --gray-light: #2c2c2c;
  --gray-border: #444;
  --text-color: #d1d1d1;
  --text-dark: #e0e0e0;
  --link-color: #66b0ff;
  --link-hover-color: #99ccff;
  --footer-bg: #013f34;
  --footer-sub-bg: #002b24;
  --footer-accent: #66d1bb;
  --error-color: #ff6666;
  background-color: #000000;
}

.lightMode {
  --white: #ffffff;
  --gray-light: #f0f0f0;
  --gray-border: #e0e0e0;
  --text-color: #656565;
  --text-dark: #444;
  --link-color: #428bca;
  --link-hover-color: #2c6dad;
  --footer-bg: #046e5a;
  --footer-sub-bg: #003e34;
  --footer-accent: #a2f3e4;
  --error-color: #e74c3c;
  background-color: #ffffff;
}

@media (prefers-color-scheme: darkMode) {
  body {
    background-color: #121212;
    color: #ffffff;
  }
}

/* HEADER */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1% 5% 1% 5%;
  background-color: var(--white);
}

.header .logo img {
  height: 50px;
  transition: transform 0.3s ease;
}

.header .logo img:hover {
  transform: scale(1.1);
}

.header .nav-container {
  display: flex;
  align-items: center;
  gap: 15px;
}

.header ul {
  display: flex;
  list-style-type: none;
  align-items: center;
  gap: 40px;
}

.header li a {
  text-decoration: none;
  color: var(--text-color);
  font-size: var(--font-medium);
  font-weight: 700;
}

.header ul li.active a {
  color: var(--primary-color);
}

#theme-switch {
  background-color: var(--gray-light);
  color: var(--text-dark);
  border: none;
  border-radius: 20px;
  padding: 8px 15px;
  font-size: var(--font-medium);
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

#theme-switch::before {
  content: "\f185";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
}

.darkMode #theme-switch::before {
  content: "\f186";
}

#theme-switch:hover {
  background-color: var(--primary-color);
  color: var(--white);
}

.menu-toggle {
  display: none;
}

.menu-icon {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 25px;
  height: 18px;
  cursor: pointer;
}

.menu-icon span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-color);
  transition: all 0.3s ease;
}

.darkMode .menu-icon span {
  background-color: var(--text-dark);
}

/* Responsive Header */
@media (max-width: 768px) {
  .header {
    padding: 15px 20px;
    justify-content: space-between;
    align-items: center;
    min-height: 60px;
  }

  .header .logo img {
    height: 35px;
  }

  .header .nav-container {
    display: flex;
    align-items: center;
    gap: 25px;
  }

  .header ul {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    flex-direction: column;
    gap: 0;
    padding: 10px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  }

  .darkMode .header ul {
    background-color: #222;
  }

  .nav-container .menu-toggle:checked ~ ul {
    display: flex;
  }

  .header li {
    width: 100%;
    text-align: center;
  }

  .header li a {
    display: block;
    padding: 15px;
    font-size: var(--font-medium);
    border-bottom: 1px solid var(--gray-border);
    transition: background-color 0.3s ease;
  }

  .darkMode .header li a {
    border-bottom: 1px solid var(--gray-border);
  }

  .header li a:hover {
    background-color: var(--gray-light);
  }

  .darkMode .header li a:hover {
    background-color: #333;
  }

  .header li:last-child a {
    border-bottom: none;
  }

  #theme-switch {
    margin: 10px 0;
    padding: 6px 20px;
    font-size: var(--font-small);
    width: fit-content;
    border-radius: 20px;
  }

  .menu-icon {
    display: flex;
  }

  .nav-container .menu-toggle:checked ~ .menu-icon span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
  }

  .nav-container .menu-toggle:checked ~ .menu-icon span:nth-child(2) {
    opacity: 0;
  }

  .nav-container .menu-toggle:checked ~ .menu-icon span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
}

/* CSS HOME TAB */
.content-home {
  margin-top: 80px;
}

.slider {
  position: relative;
  margin-top: 86px;
  width: 100%;
  overflow: hidden;
  background-color: var(--gray-light);
}

.slides {
  display: flex;
  transition: transform 0.8s ease-in-out;
}

.slide {
  width: 100%;
  flex-shrink: 0;
  object-fit: cover;
  height: 100%;
  background-color: var(--gray-light);
}

button.prev,
button.next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(0, 0, 0, 0.4);
  border: none;
  color: var(--white);
  font-size: var(--font-heading-large);
  padding: 12px 16px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button.prev:hover,
button.next:hover {
  background-color: rgba(0, 0, 0, 0.6);
}

button.prev {
  left: 15px;
}

button.next {
  right: 15px;
}

.informationApp .title,
.description {
  text-align: center;
  margin-top: 50px;
}

.informationApp h2 {
  font-size: var(--font-heading-xl);
  color: var(--text-dark);
}

.informationApp p {
  font-size: var(--font-medium);
  color: var(--text-color);
}

/* Responsive Home Tab */
@media (max-width: 768px) {
  .content-home {
    margin-top: -25px;
  }

  .slider {
    margin-top: 100px;
  }

  .slide {
    height: 40vh;
  }

  button.prev,
  button.next {
    font-size: var(--font-heading-large);
    padding: 12px 16px;
  }

  .informationApp .title,
  .description {
    margin-top: 50px;
  }

  .informationApp h2 {
    font-size: var(--font-heading-xl);
  }

  .informationApp p {
    font-size: var(--font-medium);
  }
}

/* CSS PRIVACY TAB */
.content-privacy {
  margin-top: 80px;
}

.content-privacy__title {
  background-color: var(--primary-color);
}

.content-privacy__title h1 {
  color: var(--white);
  font-size: var(--font-heading-xxl);
  padding-top: 20px;
  padding-bottom: 20px;
  padding-left: 200px;
}

.content-privacy__content {
  max-width: 960px;
  margin-top: 50px;
  margin-left: 150px;
  padding: 30px 30px;
  background: var(--white);
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  animation: fadeSlideIn 0.6s ease;
}

.content-privacy__content h3 {
  font-size: var(--font-heading-medium);
  font-weight: 700;
  color: var(--primary-color);
  position: relative;
  padding-left: 18px;
  margin-bottom: 10px;
}

.content-privacy__content h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 20px;
  background-color: var(--primary-color);
  border-radius: 3px;
}

.content-privacy__content p {
  font-size: var(--font-large);
  color: var(--text-dark);
  line-height: 1.8;
  text-align: justify;
  margin-left: 6px;
  border-left: 3px solid var(--gray-border);
  padding-left: 15px;
  transition: all 0.3s ease;
  margin-top: 20px;
  margin-bottom: 20px;
}

.content-privacy__content a {
  word-wrap: break-word;
}

.content-privacy__content a {
  text-decoration: none;
  color: var(--link-color);
}

.content-privacy__content a:hover {
  color: var(--link-hover-color);
  text-decoration: underline;
}

/* Animation */
@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Privacy Tab */
@media (max-width: 768px) {
  .content-privacy {
    margin-top: 60px;
  }

  .content-privacy__title h1 {
    font-size: var(--font-heading-large);
    padding: 20px 20px;
    text-align: center;
  }

  .content-privacy__content {
    max-width: 90%;
    margin: 50px auto;
    padding: 30px 30px;
  }

  .content-privacy__content h3 {
    font-size: var(--font-heading-small);
    padding-left: 18px;
  }

  .content-privacy__content a {
    max-width: 200px;
    word-wrap: break-word;
  }

  .content-privacy__content p {
    font-size: 14px;
    margin-top: 20px;
    margin-bottom: 20px;
    padding-left: 15px;
  }
}

/* CSS CONTACT */
.content-privacy__title {
  margin-top: 80px;
}

form.form {
  max-width: 600px;
  margin: 40px auto;
  padding: 30px 40px;
  background: var(--white);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

form.form .heading {
  font-size: var(--font-heading-large);
  margin-bottom: 10px;
  color: var(--primary-color);
  text-align: center;
}

form.form .desc {
  font-size: 16px;
  color: #666;
  margin-bottom: 30px;
  text-align: center;
  line-height: 1.6;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--text-color);
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: var(--font-medium);
  transition: border-color 0.3s ease;
  background-color: var(--white);
  color: var(--text-dark);
  border-color: var(--primary-color);
}

.form-control:focus {
  border-color: var(--secondary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(4, 110, 90, 0.1);
}

.form-message {
  color: var(--error-color);
  font-size: 13px;
  margin-top: 5px;
}

.form-submit {
  display: inline-block;
  width: 100%;
  background: var(--secondary-color);
  color: #ffffff;
  padding: 14px 0;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.3s ease;
  font-weight: bold;
  text-transform: uppercase;
}

.form-submit:hover {
  background: #024c40;
}

/* Responsive Contact Form */
@media (max-width: 768px) {
  .content-privacy__title {
    margin-top: 60px;
  }

  form.form {
    max-width: 90%;
    margin: 40px auto;
    padding: 30px 40px;
  }

  form.form .heading {
    font-size: var(--font-heading-large);
  }

  form.form .desc {
    font-size: 16px;
    margin-bottom: 30px;
  }

  .form-group {
    margin-bottom: 20px;
  }

  .form-label {
    font-size: var(--font-medium);
    color: #ffffff;
  }

  .form-control {
    padding: 12px 14px;
    font-size: var(--font-medium);
  }

  .form-message {
    font-size: 13px;
  }

  .form-submit {
    padding: 14px 0;
    font-size: 16px;
  }
}

/* Footer */
.footer {
  margin-top: 50px;
  color: var(--white);
  background-color: var(--footer-bg);
}

.mainFooter {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 40px;
  padding: 50px 10%;
}

.footer-column {
  min-width: 220px;
}

.mainFooter h3 {
  font-size: var(--font-heading-small);
  margin-bottom: 20px;
  position: relative;
  padding-left: 10px;
  color: #ffffff;
  border-left: 4px solid var(--footer-accent);
}

.mainFooter ul {
  list-style: none;
}

.mainFooter li {
  margin-bottom: 18px;
  font-size: var(--font-medium);
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all 0.3s ease;
  opacity: 0.9;
  color: #ffffff;
}

.mainFooter a {
  color: #ffffff;
  text-decoration: none;
  transition: color 0.3s ease;
}

.mainFooter i {
  color: var(--footer-accent);
  font-size: 16px;
  min-width: 20px;
}

.subFooter {
  background-color: var(--footer-sub-bg);
}

.subFooter p {
  color: #ffffff;
  padding-top: 20px;
  padding-bottom: 20px;
  font-size: var(--font-small);
  text-align: center;
}

@media (min-width: 768px) and (max-width: 1024px) {
  /* Responsive Header cho iPad */
  .header {
    padding: 10px 30px;
  }

  .header .logo img {
    height: 45px;
  }

  .header .nav-container {
    gap: 20px;
  }

  .header ul {
    gap: 30px;
  }

  .header li a {
    font-size: var(--font-large);
  }

  #theme-switch {
    padding: 6px 12px;
    font-size: var(--font-medium);
  }

  /* Responsive Slider cho iPad */
  .slider {
    margin-top: 70px;
  }

  .slide {
    height: 50vh;
  }

  button.prev,
  button.next {
    font-size: var(--font-heading-xl);
    padding: 10px 14px;
  }

  /* Responsive Home Tab cho iPad */
  .content-home {
    margin-top: 0px;
  }

  .informationApp .title,
  .description {
    margin-top: 40px;
  }

  .informationApp h2 {
    font-size: var(--font-heading-large);
  }

  .informationApp p {
    font-size: var(--font-large);
  }

  /* Responsive Privacy Tab cho iPad */
  .content-privacy {
    margin-top: 70px;
  }

  .content-privacy__title h1 {
    font-size: var(--font-heading-xl);
    padding-left: 100px;
  }

  .content-privacy__content {
    max-width: 100%;
    margin-left: 50px;
    margin-right: 50px;
    padding-right: 300px;
    padding: 25px;
  }

  .content-privacy__content h3 {
    font-size: var(--font-heading-medium);
  }

  .content-privacy__content p {
    font-size: var(--font-medium);
  }

  /* Responsive Contact Form cho iPad */
  .content-privacy__title {
    margin-top: 70px;
  }

  form.form {
    max-width: 80%;
    padding: 25px 35px;
  }

  form.form .heading {
    font-size: var(--font-heading-xl);
  }

  .form-control {
    padding: 10px 12px;
  }

  .form-submit {
    padding: 12px 0;
  }

  /* Responsive Footer cho iPad */
  .footer {
    margin-top: 40px;
  }

  .mainFooter {
    gap: 30px;
    padding: 40px 8%;
  }

  .footer-column {
    min-width: 200px;
  }

  .mainFooter h3 {
    font-size: var(--font-heading-medium);
  }

  .mainFooter li {
    font-size: var(--font-large);
  }

  .subFooter p {
    font-size: var(--font-medium);
  }
}

/* Responsive Footer */
@media (max-width: 768px) {
  .footer {
    margin-top: 30px;
  }

  .mainFooter {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    padding: 30px 5%;
    text-align: center;
  }

  .footer-column {
    min-width: 100%;
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    transition: transform 0.3s ease;
  }

  .footer-column:hover {
    transform: translateY(-5px);
  }

  .mainFooter h3 {
    font-size: var(--font-heading-small);
    margin-bottom: 20px;
    padding-left: 0;
    border-left: none;
    border-bottom: 2px solid var(--footer-accent);
    padding-bottom: 5px;
    display: inline-block;
  }

  .mainFooter li {
    margin-bottom: 18px;
    font-size: var(--font-medium);
    gap: 10px;
    justify-content: center;
    transition: background 0.3s ease;
    padding: 5px;
    border-radius: 5px;
  }

  .mainFooter li:hover {
    background: rgba(255, 255, 255, 0.2);
  }

  .mainFooter i {
    font-size: 16px;
  }

  .subFooter p {
    font-size: var(--font-small);
    padding: 20px 0;
  }
}