:root {
  --navy: #000080;
  --white: #ffffff;
}


/* Navigation */
.logo img{
  height:50px;
  float: left;
  margin-right: 20px;
}
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  background: rgba(0,0,128,0.95);
  color: var(--white);
  z-index: 1000;
  transition: var(--transition);
  box-sizing: border-box;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--white);
  text-decoration: none;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: #ffd700;
}

.menu-toggle {
  display: none;
  cursor: pointer;
}
/*Hết navigation bar*/

body {
  font-family: 'Arial', sans-serif;
  background: #ffffff;
  color: #001f3f;
  text-align: center;
  margin: 0;
  padding: 0;
}

h1 {
  margin: 20px;
  font-size: 36px;
  margin-top: 100px;
  padding-top: 30px;
  color:#000080;
}

.carousel {
  position: relative;
  max-width: 800px;
  margin: auto;
  overflow: hidden;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  background: #f8f8f8;
}

.slide {
  display: none;
  transition: opacity 1s ease;
}

.slide img {
  width: 100%;
  border-bottom: 1px solid #ccc;
}

.caption {
  background: #ffffff;
  padding: 15px;
}

.caption h2 {
  margin: 10px 0;
  font-size: 28px;
}

.caption p {
  font-size: 18px;
  color: #333;
}

button {
  margin-top: 10px;
  padding: 8px 16px;
  background-color: #001f3f;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #003366;
}

.active {
  display: block;
}

.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  padding: 10px;
  font-size: 24px;
  background-color: rgba(0, 0, 0, 0.5);
  color: white;
  border: none;
  border-radius: 50%;
  user-select: none;
}

.prev {
  left: 10px;
}

.next {
  right: 10px;
}

/* Popup chi tiết */
.popup {
  display: none;
  position: fixed;
  z-index: 999;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.6);
}

.popup-content {
  background-color: #fff;
  margin: auto;
  padding: 20px;
  border-radius: 8px;
  width: 80%;
  max-width: 500px;
  text-align: left;
}

.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover {
  color: black;
  cursor: pointer;
}

@media (min-width: 768px) {
    .promo-list {
      display: grid;
      grid-template-columns: 1fr;
      gap: 30px;
    }
  }

/* Footer */
.footer {
  background-color: var(--navy);
  color: var(--white);
  padding: 4rem 5%;
  margin-top: 4rem;
  margin-bottom: 0;
  width:100%;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-col h3 {
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
  text-transform: uppercase;
}

.footer-col p {
  margin: 0.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-links a {
  color: var(--white);
  font-size: 1.5rem;
  transition: var(--transition);
}

.social-links a:hover {
  color: #ffd700;
  transform: translateY(-2px);
}

/* 1. Đảm bảo toàn bộ phần tử không vượt ra ngoài khung */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* 2. Ẩn overflow ngang */
html, body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

/* 3. Images, carousel và navbar không vượt quá 100% */
img,
.carousel,
.navbar,
.popup-content {
  max-width: 100%;
}

/* 4. Đảm bảo carousel co dãn đúng */
.carousel {
  width: 100%;
  max-width: 800px; /* nếu bạn vẫn muốn giới hạn */
  margin: 0 auto;
}

/* 5. Đảm bảo popup-content co đúng trong viewport */
.popup-content {
  width: 90%;
  max-width: 500px;
  box-sizing: border-box;
}


/* Với màn hình nhỏ hơn 992px */
@media (max-width: 992px) {
  .nav-links {
    display: none;
    flex-direction: column;
    background: rgba(0, 0, 128, 0.95);
    position: absolute;
    top: 80px;
    right: 20px;
    width: 200px;
    border-radius: 8px;
    overflow: hidden;
  }

  .nav-links.active {
    display: flex;
  }

  .menu-toggle {
    display: block;
    color: #ffffff;
    font-size: 1.8rem;
    margin-right: 20px;
    cursor: pointer;
  }

  .logo {
    font-size: 1.2rem;
  }

  h1 {
    font-size: 2rem;
    margin-top: 80px;
  }

  .caption h2 {
    font-size: 1.5rem;
  }

  .caption p {
    font-size: 1rem;
  }

  .popup-content {
    width: 90%;
  }
}

/* Với màn hình nhỏ hơn 768px */
@media (max-width: 768px) {
  .carousel {
    max-width: none;
    width: 100%;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-col {
    margin-bottom: 2rem;
  }

  .social-links {
    justify-content: center;
  }
}