/* CSS Variables */
:root {
  --primary-navy: #003399;
  --secondary-blue: #0056b3;
  --accent-blue: #00a3ff;
  --dark-navy: #002d72;
  --dark: #000;
  --light-blue: #eef5ff;
  --bg-light: #f8faff;
  --white: #ffffff;
  --text-dark: #333333;
  --text-main: #333333;
  --text-muted: #666666;
  --border-color: #dddddd;
  --transition-speed: 0.3s;
  --container-width: 1440px;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.05);
  --shadow-strong: 0 20px 40px rgba(0, 70, 184, 0.15);
  --primary-blue: #0046b8;
}

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

body {
  font-family: "Montserrat", sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

.site-content .ast-container {
  max-width: 100%;
  padding: 0;
}

img {
  max-width: 100%;
  display: block;
  object-fit: cover;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-speed);
}

ul {
  list-style: none;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.text-center {
  text-align: center;
}

.section-padding {
  padding: 80px 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary-navy);
  margin-bottom: 40px;
  text-align: center;
  text-transform: uppercase;
}

.top-info img {
  margin-right: 5px;
}

.top-info span,
.top-info a {
  display: flex;
  align-items: center;
  color: #000000;
  font-size: 14px;
}

/* Buttons */
.btn-primary {
  background: var(--primary-navy);
  color: var(--white);
  padding: 5px 22px;
  border-radius: 12px;
  display: inline-block;
  transition:
    background var(--transition-speed),
    transform 0.2s;
}

.btn-outline {
  border: 2px solid var(--primary-navy);
  color: var(--primary-navy);
  padding: 10px 20px;
  border-radius: 4px;
  font-weight: 600;
  display: inline-block;
  transition: all var(--transition-speed);
}

.btn-outline:hover {
  background: var(--primary-navy);
  color: var(--white);
}

@media (max-width: 768px) {
  .grid-4 {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-bottom {
    margin-top: 30px;
  }
}

/* RESPONSIVE RULES */

/* Tablet (< 992px) */
@media (max-width: 991px) {
  /* .container {
        padding: 0 30px;
    } */

  .grid-6 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-5 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile (< 768px) */
@media (max-width: 767px) {
  .section-padding {
    padding: 50px 0;
  }

  .section-title {
    font-size: 2rem;
    /* reduced roughly 20% from 2.5rem */
  }

  .navbar .container {
    position: relative;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: -100%;
    width: 100%;
    background: var(--white);
    flex-direction: column;
    gap: 0;
    padding: 30px;
    transition: left 0.3s ease-in-out;
    box-shadow: 0 10px 10px rgba(0, 0, 0, 0.1);
    text-align: left;
  }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid #eee;
  }

  .nav-links li a {
    display: block;
    padding: 15px 20px;
  }

  /* ✅ FIX QUAN TRỌNG */
  .dropdown {
    position: static;
    display: none;
    background: #f9f9f9;
    transition: max-height 0.3s ease;
    overflow: hidden;

    padding-left: 15px;
  }

  .has-dropdown.open .dropdown {
    display: block;
  }

  .dropdown li a {
    padding: 12px 20px;
    font-size: 14px;
  }

  .nav-links.active {
    left: 0;
  }

  .menu-toggle {
    display: block;
  }

  .menu-toggle.active .bar:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .menu-toggle.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .grid-6,
  .grid-5,
  .grid-4,
  .grid-3,
  .grid-carousel {
    grid-template-columns: 1fr;
  }

  .flex-contact {
    flex-direction: column;
    text-align: center;
  }

  .contact-text h2 {
    font-size: 2.4rem;
    /* reduced 20% */
  }

  .btn-primary,
  .btn-outline,
  .btn-submit {
    display: block;
    width: 100%;
    text-align: center;
  }

  .top-info span {
    display: none;
    /* Hide location on very small mobile for space */
  }

  .has-dropdown .dropdown {
    display: none;
  }

  .has-dropdown.open .dropdown {
    display: block;
  }
}

/* Hero Section Rebuild */
.about-hero {
  position: relative;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--white);
  background: url("../images/image_banner_about.jpg") center/cover no-repeat;
}

/* We will use Về Cambridge Scout as the background but with better overlay */
.about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;

  background:
    linear-gradient(rgba(0, 50, 173, 0.6), rgba(0, 50, 173, 0.6)),
    url("../images/image_banner_about.jpg") center/cover;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  padding: 0 40px;
  width: 100%;
}

.hero-content-box {
  padding: 60px 40px;
  position: relative;
  backdrop-filter: blur(2px);
}

.badge-vcs {
  background: #003399;
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: none;
  margin-bottom: 25px;
  display: inline-block;
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
}

.hero-inner h1 {
  font-size: 3.8rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 5px;
  text-transform: none;
  color: #fff;
}

.title-more {
  font-size: 3.8rem;
  color: #00f2ff;
  /* Neon Cyan */
  text-transform: none;
  display: block;
  margin-bottom: 30px;
  font-weight: 800;
}

.hero-quote {
  font-size: 1.35rem;
  max-width: 900px;
  margin: 0 auto;
  line-height: 1.5;
  color: #e5e7eb;
}

@media (max-width: 1024px) {
  .about-hero {
    height: auto;
    min-height: 520px;
    padding: 100px 0 80px;
  }

  .about-hero .hero-inner {
    padding: 0 32px;
  }

  .about-hero .hero-content-box {
    padding: 52px 24px 24px;
  }

  .about-hero .badge-vcs {
    top: -12px;
    font-size: 0.8rem;
  }

  .about-hero .hero-inner h1,
  .about-hero .title-more {
    font-size: 3rem;
  }

  .about-hero .hero-quote {
    max-width: 720px;
    font-size: 1.15rem;
  }
}

@media (max-width: 768px) {
  .about-hero {
    min-height: 460px;
    padding: 84px 0 64px;
  }

  .about-hero .hero-inner {
    padding: 0 20px;
  }

  .about-hero .hero-content-box {
    padding: 44px 20px 20px;
    backdrop-filter: blur(1.5px);
  }

  .about-hero .badge-vcs {
    top: -10px;
    padding: 6px 14px;
    font-size: 0.75rem;
    max-width: calc(100% - 40px);
    white-space: nowrap;
  }

  .about-hero .hero-inner h1,
  .about-hero .title-more {
    font-size: 2.2rem;
  }

  .about-hero .title-more {
    margin-bottom: 20px;
  }

  .about-hero .hero-quote {
    max-width: 100%;
    font-size: 1rem;
    line-height: 1.7;
  }
}

@media (max-width: 480px) {
  .about-hero {
    min-height: 400px;
    padding: 72px 0 56px;
  }

  .about-hero .hero-inner {
    padding: 0 16px;
  }

  .about-hero .hero-content-box {
    padding: 18px 16px 16px;
  }

  .about-hero .badge-vcs {
    position: static;
    transform: none;
    margin-bottom: 16px;
    max-width: 100%;
    white-space: normal;
  }

  .about-hero .hero-inner h1,
  .about-hero .title-more {
    font-size: 1.75rem;
    line-height: 1.15;
  }

  .about-hero .title-more {
    margin-bottom: 16px;
  }

  .about-hero .hero-quote {
    font-size: 0.95rem;
  }
}

/* Intro Section */
.intro-section {
  background: var(--white);
  padding: 65px 0;
}

.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 30px;
  align-items: center;
}

.intro-content h2 {
  font-size: 1.9rem;
  color: var(--dark);
  margin-bottom: 25px;
  position: relative;
  padding-bottom: 15px;
}

.intro-content h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 3px;
  background: var(--primary-blue);
}

.intro-text p {
  margin-bottom: 20px;
  color: #555;
}

.mission-box {
  background: #f0f6ff;
  border-left: 4px solid var(--primary-blue);
  padding: 30px;
  margin-top: 40px;
  border-radius: 4px 12px 12px 4px;
  box-shadow: var(--shadow-soft);
}

.mission-box h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--dark);
  margin-bottom: 15px;
  font-size: 1.3rem;
}

.icon_1 {
  color: #1a37ae;
}

.intro-image {
  position: relative;
  z-index: 0;
  padding: 0 36px 34px 0;
}

.intro-image img {
  position: relative;
  z-index: 1;
  border-radius: 20px;
  box-shadow: var(--shadow-strong);
  width: 96%;
}

.intro-image::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -16px;
  width: 83%;
  height: 85%;
  background: linear-gradient(135deg, #1b3fd1 0%, var(--primary-blue) 100%);
  border-radius: 18px;
  z-index: -1;
}

/* Expert Cards */
.expert-section {
  background: #f9fafb;
}

.padding-tp {
  padding: 60px 0px;
}

.section-title-about {
  font-size: 2.3rem;
  color: #1a37ae;
  margin-bottom: 15px;
}

.expert-section-content p {
  color: #4b5563;
  line-height: 1.6;
  font-size: 1.12rem;
}

.expert-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(280px, 390px));
  justify-content: center;
  gap: 24px;
  max-width: 1024px;
  margin: 50px auto 0;
}

@media (max-width: 768px) {
  .expert-grid {
    padding: 0 15px;
  }
}

@media (max-width: 1024px) {
  .expert-grid {
    padding: 0 15px;
  }
}

.expert-card {
  background: var(--white);
  padding: 28px 24px;
  border-radius: 22px;
  display: grid;
  grid-template-columns: 71px 1fr;
  column-gap: 18px;
  row-gap: 14px;
  align-items: start;
  text-align: left;
}

.expert-icon {
  grid-column: 1;
  grid-row: 1;
  font-size: 2.8rem;
  line-height: 1;
  color: var(--primary-blue);
}

.expert-icon img {
  width: 100%;
  height: auto;
}

.expert-info {
  display: contents;
}

.expert-info h3 {
  grid-column: 2;
  grid-row: 1;
  font-size: 1.9rem;
  color: #1b1955;
  line-height: 1.2;
  margin: 0;
  font-weight: 800;
  align-self: center;
}

.expert-card .expert-info p {
  grid-column: 1 / -1;
  grid-row: 2;
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.75;
}

/* Curriculum Section */
.curriculum-section {
  padding: 60px 0;
}

.curriculum-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 40px;
  max-width: 1200px;
  margin: 25px auto;
  align-items: center;
}

.section-title-curriculum {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 10px;
  text-align: center;
}

.curriculum-description {
  width: 53%;
}

@media (max-width: 1224px) {
  .curriculum-description {
    width: 81%;
  }
}

@media (max-width: 1024px) {
  .curriculum-description {
    width: 80%;
  }
}

@media (max-width: 768px) {
  .curriculum-grid {
    grid-template-columns: 1fr;
  }

  .section-title-curriculum {
    font-size: 2rem;
  }

  .curriculum-description {
    width: 86%;
  }
}

.service-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.service-item {
  display: flex;
  gap: 20px;
  background: #f9fafb;
  padding: 20px;
  border-radius: 12px;
  /* border: 1px solid #eee; */
  /* transition: all 0.3s ease; */
}

.service-text strong {
  font-size: 1.13rem;
}

.service-text p {
  color: #4b5563;
}

.check-icon {
  width: 32px;
  height: 32px;
  background: var(--primary-navy);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.9rem;
  margin-top: 5px;
}

.support-blue-card {
  background: #0032ad;
  color: var(--white);
  padding: 40px;
  border-radius: 24px;
}

.support-blue-card h3 {
  margin-bottom: 30px;
  font-size: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 20px;
  color: #f3f4f6;
}

.support-bullet {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.fas-pt {
  padding-top: 8px;
}

/* Why Choose Us Grid */
.why-us-section {
  padding: 20px 0;
  background-color: #f3f4f6;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.why-card {
  background: var(--white);
  padding: 25px;
  border-radius: 16px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
  text-align: left;
  transition:
    border 0.3s,
    transform 0.3s ease,
    box-shadow 0.3s ease;
  border: 1px solid transparent;
}

.why-card p {
  font-size: 0.9rem;
  line-height: 1.7;
}

.why-card h3 {
  padding: 12px 0 8px;
}

.section-title-why-us {
  text-align: center;
  font-weight: bold;
  font-size: 2.3rem;
  width: 55%;
  margin: 20px auto;
  color: #191654;
}

.why-card:hover {
  border-color: var(--accent-blue);
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(0, 70, 184, 0.08);
}

.why-card-item {
  width: 17%;
  aspect-ratio: 1;
  border-radius: 22%;
  padding: 15px;
  background: #eff6ff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.why-card-item img {
  width: 100%;
  height: auto;
}

.why-card.wide {
  grid-column: span 1.5;
}

/* Helper for 3+2 grid */
.why-container {
  display: flex;
  flex-direction: column;
  gap: 30px;
  max-width: 1200px;
  margin: 37px auto;
}

.why-row {
  display: grid;
  gap: 30px;
}

.why-row-1 {
  grid-template-columns: repeat(3, 1fr);
}

.why-row-2 {
  display: flex;
  justify-content: center;
  gap: 30px;
}

.why-row-2 .why-card {
  flex: 0 1 calc(33.333% - 10px);
  max-width: 380px;
}

@media (max-width: 1024px) {
  .why-us-section {
    padding: 40px 0;
  }

  .section-title-why-us {
    width: min(100%, 760px);
    font-size: 2rem;
    line-height: 1.25;
    margin: 0 auto 18px;
  }

  .why-container {
    gap: 24px;
    margin: 30px auto 0;
  }

  .why-row {
    gap: 24px;
  }

  .why-row-1 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .why-row-1 .why-card:nth-child(3) {
    grid-column: 1 / -1;
  }

  .why-row-1 .why-card:nth-child(3) .why-card-item {
    width: 8%;
  }

  .why-row-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .why-row-2 .why-card {
    flex: initial;
    max-width: none;
  }

  .why-card {
    padding: 22px;
  }
}

@media (max-width: 768px) {
  .why-us-section {
    padding: 36px 0;
  }

  .section-title-why-us {
    width: 100%;
    font-size: 1.8rem;
    line-height: 1.3;
  }

  .why-container {
    gap: 18px;
    margin: 24px auto 0;
  }

  .why-row-1,
  .why-row-2 {
    display: grid;
    grid-template-columns: 1fr !important;
    gap: 18px;
  }

  .why-row-1 .why-card:nth-child(3) {
    grid-column: auto;
  }

  .why-row-1 .why-card:nth-child(3) .why-card-item {
    width: 60px;
  }

  .why-card {
    padding: 20px;
    border-radius: 18px;
  }

  .why-card h3 {
    font-size: 1.08rem;
  }

  .why-card p {
    font-size: 0.95rem;
  }

  .why-card-item {
    width: 60px;
    padding: 12px;
  }
}

@media (max-width: 480px) {
  .section-title-why-us {
    font-size: 1.5rem;
  }

  .why-card {
    padding: 18px 16px;
  }

  .why-card-item {
    width: 52px;
    padding: 10px;
    border-radius: 16px;
  }
}

/* Animations */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile Adjustments */
@media (max-width: 900px) {
  .intro-grid,
  .expert-grid,
  .curriculum-grid {
    grid-template-columns: 1fr !important;
    max-width: 100% !important;
  }

  .hero-inner h1 {
    font-size: 2.5rem;
  }

  .intro-image {
    max-width: 640px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .intro-image {
    padding: 0 20px 22px 0;
  }

  .intro-image::after {
    width: 74%;
    height: 38%;
  }
}

@media (max-width: 1024px) and (min-width: 901px) {
  .intro-section {
    padding: 56px 0;
  }

  .intro-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 24px;
  }

  .intro-content h2 {
    font-size: 1.7rem;
    margin-bottom: 22px;
    padding-bottom: 12px;
  }

  .intro-text p,
  .mission-box p {
    font-size: 0.98rem;
    line-height: 1.75;
  }

  .mission-box {
    padding: 24px;
    margin-top: 32px;
  }

  .mission-box h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
  }

  .intro-image {
    padding: 0 28px 24px 0;
  }

  .intro-image img {
    width: 100%;
  }

  .intro-image::after {
    width: 80%;
    height: 78%;
    bottom: -10px;
  }
}

@media (max-width: 900px) {
  .intro-section {
    padding: 52px 0;
  }

  .intro-grid {
    gap: 26px;
    align-items: start;
  }

  .intro-content h2 {
    font-size: 1.7rem;
    margin-bottom: 22px;
    padding-bottom: 12px;
  }

  .intro-text p,
  .mission-box p {
    font-size: 1rem;
    line-height: 1.75;
  }

  .mission-box {
    padding: 24px;
    margin-top: 28px;
  }

  .mission-box h3 {
    font-size: 1.12rem;
    margin-bottom: 12px;
  }

  .intro-image {
    width: 100%;
    max-width: 620px;
    padding: 0 28px 24px 0;
    margin: 0 auto;
  }

  .intro-image img {
    width: 100%;
  }

  .intro-image::after {
    width: 80%;
    height: 72%;
    bottom: -10px;
  }
}

@media (max-width: 768px) {
  .intro-section {
    padding: 42px 0;
  }

  .intro-grid {
    gap: 22px;
  }

  .intro-content h2 {
    font-size: 1.5rem;
    margin-bottom: 18px;
  }

  .intro-content h2::after {
    width: 68px;
  }

  .intro-text p,
  .mission-box p {
    font-size: 0.96rem;
  }

  .mission-box {
    padding: 20px 18px;
    margin-top: 22px;
    border-left-width: 3px;
  }

  .mission-box h3 {
    gap: 8px;
    font-size: 1.02rem;
    line-height: 1.4;
  }

  .intro-image {
    padding: 0 18px 18px 0;
    max-width: 560px;
  }

  .intro-image img {
    border-radius: 16px;
  }

  .intro-image::after {
    width: 78%;
    height: 64%;
    bottom: -8px;
    border-radius: 16px;
  }
}

@media (max-width: 480px) {
  .intro-section {
    padding: 34px 0;
  }

  .intro-content h2 {
    font-size: 1.34rem;
    margin-bottom: 16px;
    padding-bottom: 10px;
  }

  .intro-content h2::after {
    width: 56px;
  }

  .intro-text p,
  .mission-box p {
    font-size: 0.94rem;
    line-height: 1.7;
  }

  .mission-box {
    padding: 18px 16px;
    margin-top: 20px;
    border-radius: 4px 10px 10px 4px;
  }

  .mission-box h3 {
    font-size: 0.97rem;
  }

  .intro-image {
    padding: 0 14px 16px 0;
  }

  .intro-image::after {
    width: 80%;
    height: 58%;
    bottom: -6px;
    border-radius: 14px;
  }
}