:root {
  --primary: #0066cc; 
  --secondary: #00b39f; 
  --dark: #0f172a; 
  --white: #ffffff;
  --light: #f5f7fa; 
  --shadow: 0 4px 15px rgba(0, 0, 0, 0.1);

  
  --footer-bg: #003d7c; 
  --footer-light: #52c2ff;
  --footer-text: #e0f7ff;
}

html,
body {
  margin: 0;
  padding: 0;
  border: 0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
  scroll-behavior: smooth;
}

body {
  background-color: var(--light);
  color: var(--dark);
  line-height: 1.6;
  overflow-x: hidden;
  font-size: 16px;
}

.container-custom {
    max-width: 1150px;
    margin: 0 auto;
    padding: 0 20px;
}
header {
  background:  linear-gradient(135deg, #00b4d8, #0077b6);
  color: var(--white);
  padding: 14px 0;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav {
  max-width: 1150px;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

.brand {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 22px;
}

nav a {
  color: var(--white);
  font-weight: 600;
  text-decoration: none;
  position: relative;
  transition: 0.3s;
  padding: 5px 0;
}

nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 3px;
  background: var(--white);
  transition: width 0.3s;
}

nav a:hover::after,
nav a.active::after {
  width: 100%;
}
.hero {
  background: linear-gradient(rgba(0, 70, 160, 0.75), rgba(0, 179, 159, 0.75)),
    url('download.jfif');
  background-size: cover;
  background-position: center;
  color: var(--white);
  text-align: center;
  padding: 130px 20px 100px;
  min-height: 400px;
}

.hero h1 {
  font-size: 46px;
  font-weight: 800;
  margin-bottom: 16px;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.hero p {
  font-size: 18px;
  max-width: 820px;
  margin: 0 auto;
  opacity: 0.95;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-actions {
  margin-top: 38px;
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

.btn-primary {
  background: linear-gradient(135deg, #00b4d8, #0077b6);
  color: #fff;
  padding: 14px 34px;
  border-radius: 50px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 6px 18px rgba(0, 119, 182, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0096c7, #023e8a);
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 119, 182, 0.6);
  filter: brightness(1.15);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid #fff;
  padding: 13px 30px;
  border-radius: 50px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-3px);
  box-shadow: 0 4px 15px rgba(255, 255, 255, 0.3);
}

.intro-section {
    padding: 80px 0;
    background-color: var(--white);
}

.intro-grid {
    display: grid;
    grid-template-columns: 2fr 1fr; 
    gap: 40px;
    align-items: center;
}

.intro-grid h2 {
    color: var(--primary);
    font-size: 30px;
    font-weight: 800;
    margin-bottom: 20px;
    position: relative;
}

.intro-grid h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--secondary);
    margin-top: 10px;
    border-radius: 2px;
}

.intro-grid .text-content p {
    margin-bottom: 15px;
    color: var(--dark);
    line-height: 1.7;
    opacity: 0.9;
    font-size: 16px;
}

.intro-logo {
    display: block;
    width: 100%;
    max-width: 220px;
    height: auto;
    margin: 0 auto;
    opacity: 0.95;
    transition: transform 0.3s;
}
.intro-logo:hover {
    transform: scale(1.05);
}


.vision-mission-section {
    padding: 70px 0;
    background-color: var(--primary);
    color: var(--white);
    text-align: center;
}
.vision-mission-section .container-custom {
    display: flex;
    justify-content: space-around;
    gap: 40px;
    flex-wrap: wrap;
}
.mission-item {
    flex-basis: 45%;
    max-width: 500px;
    padding: 30px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    transition: background-color 0.3s, transform 0.3s;
}
.mission-item:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px);
}
.mission-item i {
    font-size: 45px;
    color: var(--secondary);
    margin-bottom: 15px;
}
.mission-item h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--white);
}
.mission-item p {
    font-size: 16px;
    opacity: 0.9;
    line-height: 1.7;
}


.ktx-features-section {
    padding: 80px 0;
    background-color: var(--light);
    text-align: center;
}

.ktx-features-section h2 {
    color: var(--primary);
    font-size: 34px;
    font-weight: 800;
    margin-bottom: 10px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--dark);
    margin-bottom: 50px;
    opacity: 0.8;
}

.feature-detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.detail-item {
    background: var(--white);
    padding: 35px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s;
    border-top: 4px solid var(--secondary);
}

.detail-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.detail-item i {
    font-size: 40px;
    color: var(--secondary);
    margin-bottom: 15px;
}

.detail-item h4 {
    font-size: 22px;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 10px;
}

.detail-item p {
    font-size: 16px;
    color: var(--dark);
    opacity: 0.85;
    line-height: 1.6;
}


.ktx-environment-section {
    padding: 70px 0;
    background-color: var(--white);
    text-align: center;
}
.ktx-environment-section h2 {
    color: var(--primary);
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 40px;
}
.environment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}
.environment-item {
    background: var(--light);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s;
}
.environment-item:hover {
    transform: translateY(-5px);
}
.environment-item img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    filter: brightness(0.95);
}
.environment-item h4 {
    color: var(--primary);
    font-size: 20px;
    font-weight: 700;
    margin-top: 15px;
    padding: 0 15px;
}
.environment-item p {
    font-size: 15px;
    padding: 0 15px 25px;
    line-height: 1.6;
    opacity: 0.9;
}
.rooms {
    background: var(--light);
    padding: 70px 20px;
}

.room-gallery h3 {
    color: var(--primary);
    font-size: 28px;
    margin-bottom: 30px;
    font-weight: 800;
    text-align: center;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.gallery-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}
.gallery-img:hover {
    transform: scale(1.02);
}



.main-footer {
  background-color: var(--footer-bg);
  color: var(--footer-text);
  padding: 60px 20px 20px;
  font-size: 15px;
  line-height: 1.6;
}

.footer-content {
  max-width: 1150px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-column {
  min-width: 260px;
  margin-bottom: 30px;
  flex: 1 1 280px; 
}

.footer-column h3 {
  font-size: 1.3em;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--footer-light);
  position: relative;
  text-align: left; 
}


.footer-column h3::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background-color: var(--footer-light);
  margin-top: 5px;
  margin-left: 0; 
  border-radius: 2px;
}


.footer-logo {
  width: 120px;
  height: auto;
  margin-bottom: 15px;
}

.footer-title {
  font-size: 1.5em;
  margin: 0 0 5px;
}

.footer-slogan {
  font-size: 0.9em;
  opacity: 0.8;
}


.footer-brand-column {
    text-align: center;
}
.footer-brand-column h3::after {
    margin: 5px auto 0;
}
.footer-social {
  margin-top: 20px;
  display: flex;
  gap: 15px;
  align-items: center;
  justify-content: flex-start; 
}

.social-icon-fa {
  font-size: 18px;
  color: #ffffff;
  width: 34px;
  height: 34px;
  line-height: 34px;
  text-align: center;
  border: 2px solid #ffffff;
  border-radius: 50%;
  transition: 0.3s;
}

.footer-social a:hover .social-icon-fa {
  transform: scale(1.1);
  opacity: 0.9;
  color: var(--footer-light);
  border-color: var(--footer-light);
  background-color: rgba(255, 255, 255, 0.1);
}


.footer-contact h3 {
    text-align: left;
}

.footer-contact ul {
    list-style: none;
    padding: 0;
}

.footer-contact ul li {
    margin-bottom: 10px;
    display: flex; 
    align-items: flex-start; 
}

.footer-contact ul li i {
    color: var(--footer-light);
    margin-right: 12px;
    font-size: 1.1em;
    margin-top: 3px; 
    flex-shrink: 0; 
}
.footer-contact ul li p {
    margin: 0;
}

.footer-contact a {
  color: var(--footer-text);
  text-decoration: none;
  transition: 0.3s;
}

.footer-contact a:hover {
  color: var(--footer-light);
  text-decoration: underline;
}

.footer-org-name {
  font-size: 1em;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--white);
}


.footer-links ul {
  list-style: none;
  padding: 0;
}

.footer-links ul li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--footer-text);
  text-decoration: none;
  transition: 0.3s;
  position: relative;
  padding-left: 18px; 
  display: inline-block;
}

.footer-links a:hover {
  color: var(--footer-light);
}

.footer-links a::before {
  content: '▶';
  position: absolute;
  left: 0;
  font-size: 0.7em;
  color: var(--footer-light);
  top: 3px;
}

.footer-bottom {
  text-align: center;
  margin-top: 20px;
  font-size: 0.85em;
  opacity: 0.7;
}


@media (max-width: 992px) {
   
    .intro-grid {
        grid-template-columns: 1fr; 
    }
    .intro-logo {
        margin-top: 30px;
    }
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr); 
    }
    .mission-item {
        flex-basis: 100%;
    }
    
   
    .footer-content {
        justify-content: space-around;
        gap: 30px;
    }
    .footer-column {
        flex: 1 1 45%;
    }
    .footer-brand-column {
        flex: 1 1 100%;
        text-align: center;
    }
    .footer-brand-column h3::after {
        margin: 5px auto 0;
    }
    
    .footer-contact h3, .footer-links h3 {
        text-align: center;
    }
    .footer-contact h3::after, .footer-links h3::after {
        margin: 5px auto 0;
    }
}

@media (max-width: 576px) {
    
    .intro-grid {
        text-align: center;
    }
    .gallery-grid {
        grid-template-columns: 1fr; 
    }
    .intro-grid h2::after {
        margin-left: auto;
        margin-right: auto;
    }
    .ktx-environment-section h2, .ktx-features-section h2, .hero h1 {
        font-size: 28px;
    }

    
    .footer-content {
        gap: 20px;
    }
    .footer-column {
        flex: 1 1 100%;
        min-width: unset;
        text-align: center;
    }
   
    .footer-contact ul {
        display: flex;
        flex-direction: column;
        align-items: center; 
    }
    .footer-contact ul li {
        justify-content: center;
        width: 100%;
    }
    .footer-links a {
        padding-left: 0;
    }
    .footer-links a::before {
        content: none;
    }
}

.callout-content {
    background-color: var(--secondary);
    color: var(--white);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 8px 25px rgba(0, 179, 159, 0.3);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.callout-content i {
    font-size: 50px;
    margin-bottom: 20px;
    color: var(--white);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.callout-content h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.4;
}

.callout-content p {
    font-size: 16px;
    margin-bottom: 25px;
    opacity: 0.9;
}

.btn-secondary-light {
    background-color: var(--white);
    color: var(--secondary);
    padding: 12px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-secondary-light:hover {
    background-color: #e0e0e0;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}
.mission-item i {
  color: #ffffff !important;
}


@media (max-width: 992px) {
    .callout-content {
        margin-top: 40px; 
    }
}

.footer-brand-column {
  text-align: left !important; 
}

.footer-brand-column h3 {
  display: inline-block;
  text-align: left;
}

.footer-brand-column h3::after {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  background-color: var(--footer-light);
  margin-top: 5px;
  margin-left: 0; 
  border-radius: 2px;
}
.member-banner {

  background: none; 
  display: flex;
  flex-direction: row; 
  align-items: center; 
  gap: 5px; 
  justify-content: center;
  padding: 0; 
  color: white;
  font-weight: 500; 
  font-size: 17px;
  line-height: 1.2;
}

.member-banner img {
  height: 50px;
  width: auto;
  vertical-align: middle;
  filter: brightness(0) invert(1); 
  margin-top: 5px; 
}


@media (max-width: 768px) {
  
  .brand {
    flex-direction: column; 
    align-items: flex-start;
    gap: 5px;
  }

  .member-banner {
    flex-direction: row;
    font-size: 22px;
  }

  .member-banner img {
    height: 25px;
    margin-top: 0;
  }
}

/* ================================================= */
/* === Cải tiến: Tầm nhìn & Sứ mệnh (Vision & Mission) === */
/* ================================================= */
.vision-mission-section {
    background-color: var(--primary); /* Sử dụng màu xanh chính làm nền */
    padding: 50px 20px;
    margin-top: 30px;
}

.vision-mission-section .container-custom {
    display: flex;
    gap: 30px;
    justify-content: center;
    max-width: 1100px;
    margin: 0 auto;
}

.vision-mission-section .mission-item {
    flex: 1;
    max-width: 500px;
    padding: 30px;
    /* Sử dụng background trắng trong suốt, viền mỏng */
    background-color: rgba(255, 255, 255, 0.1); 
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    text-align: center;
    color: var(--white); /* Chữ màu trắng */
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.vision-mission-section .mission-item:hover {
    background-color: rgba(255, 255, 255, 0.2); /* Nền rõ hơn khi di chuột */
    transform: translateY(-5px); /* Hiệu ứng nhấc nhẹ */
}

.mission-item i {
    font-size: 2.8em;
    color: var(--secondary) !important; /* Màu xanh lá nổi bật cho icon */
    margin-bottom: 15px;
    /* Hiệu ứng nổi bật cho icon */
    text-shadow: 0 0 10px rgba(0, 179, 159, 0.5); 
}

.mission-item h3 {
    font-size: 1.6em;
    font-weight: 800;
    margin-bottom: 15px;
    /* Gạch chân đơn giản */
    border-bottom: 2px solid var(--secondary);
    display: inline-block;
    padding-bottom: 5px;
}

.mission-item p {
    font-size: 1em;
    line-height: 1.6;
    color: #e0f7ff; /* Màu chữ trắng ngà */
}

/* Media Queries cho thiết bị di động */
@media (max-width: 768px) {
    .vision-mission-section .container-custom {
        flex-direction: column;
    }
}
.ktx-summary-block {
    padding: 70px 20px;
    text-align: center;
    background-color: var(--light);
}

.ktx-summary-block h2 {
    color: var(--primary);
    font-size: 34px;
    font-weight: 800;
    margin-bottom: 20px;
}

.ktx-summary-block .section-subtitle {
    font-size: 1.1em;
    max-width: 800px;
    margin: 0 auto 50px;
    color: var(--dark);
}

.summary-key-points {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    gap: 30px;
    margin-bottom: 60px;
}

.key-point-card {
    flex: 1 1 300px;
    padding: 30px;
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    /* Transition cho hiệu ứng hover */
    transition: transform 0.3s ease, box-shadow 0.3s ease; 
}

/* Hiệu ứng hover cho card */
.key-point-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

/* Màu sắc xen kẽ cho đường viền và icon */
.key-point-card:nth-child(odd) {
    border-left: 5px solid var(--secondary);
}
.key-point-card:nth-child(odd) i {
    color: var(--primary);
}

.key-point-card:nth-child(even) {
    border-left: 5px solid var(--primary);
}
.key-point-card:nth-child(even) i {
    color: var(--secondary);
}

.key-point-card i {
    font-size: 2.8em;
    margin-bottom: 15px;
    display: block;
}

.key-point-card h4 {
    font-weight: 700;
    color: var(--dark);
    font-size: 1.4em;
    margin-bottom: 10px;
}

.key-point-card p {
    font-size: 1em;
    line-height: 1.5;
    color: #555;
}

/* Định hình lại nút CTA */
.summary-cta {
    font-size: 1.1em; 
    padding: 15px 40px; 
    border-radius: 50px; 
    text-transform: uppercase; 
    letter-spacing: 1px; 
    font-weight: 800;
}

/* Media Query cho Responsive */
@media (max-width: 1050px) {
    .summary-key-points {
        /* Bật wrapping cho màn hình nhỏ */
        justify-content: center;
    }
}
@media (max-width: 650px) {
    .key-point-card {
        flex: 1 1 100%; /* Đảm bảo các card chiếm toàn bộ chiều rộng */
    }
}