.site-header {
  position: sticky;
  z-index: 1000;
  top: 0;
  width: 100%;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-header);
}

.navbar {
  position: relative;
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2rem, var(--container-max));
  margin-inline: auto;
}

.navbar__brand {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
}

.navbar__logo {
  width: auto;
  max-height: 56px;
  object-fit: contain;
}

.navbar__toggle {
  display: inline-flex;
  width: 44px;
  height: 44px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
}

.navbar__toggle:hover {
  background-color: rgb(7 59 102 / 8%);
}

.navbar__toggle-line {
  width: 24px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-line:nth-child(2) {
  opacity: 0;
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.navbar__menu {
  position: absolute;
  top: 100%;
  right: -1rem;
  left: -1rem;
  display: flex;
  max-height: 0;
  visibility: hidden;
  overflow: hidden;
  flex-direction: column;
  margin: 0;
  padding-inline: 1rem;
  border-top: 1px solid transparent;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-header);
  list-style: none;
  opacity: 0;
  transform: translateY(-0.75rem);
  transition:
    max-height 320ms ease,
    opacity var(--transition-fast),
    transform var(--transition-fast),
    visibility var(--transition-fast);
}

.navbar__menu.is-active {
  max-height: 50rem;
  visibility: visible;
  padding-block: 0.75rem 1rem;
  border-top-color: var(--color-border);
  opacity: 1;
  transform: translateY(0);
}

.navbar__link {
  display: flex;
  min-height: 44px;
  align-items: center;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-weight: 500;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.navbar__link:hover,
.navbar__link.is-current {
  background-color: rgb(7 59 102 / 8%);
  color: var(--color-primary-dark);
}

.navbar__link--cta {
  justify-content: center;
  margin-top: 0.5rem;
  background-color: var(--color-secondary);
  color: var(--color-primary-dark);
  font-weight: 700;
}

.navbar__link--cta:hover {
  background-color: var(--color-secondary-dark);
}

.submenu {
  display: none;
  flex-direction: column;
  gap: 10px;
  margin: 10px 0 0;
  padding: 0 0 0 20px;
  list-style: none;
}

.has-dropdown.active .submenu {
  display: flex;
}

.submenu a {
  display: flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-text-dark);
  text-decoration: none;
}

.submenu a:hover {
  color: var(--color-primary);
}

.hero-section {
  overflow: hidden;
  padding-block: 3.5rem;
  background: linear-gradient(180deg, rgb(13 136 196 / 10%), var(--color-surface));
}

.hero-section__container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
  width: min(100% - 2rem, var(--container-max));
  margin-inline: auto;
  text-align: center;
}

.hero-section__content,
.hero-section__media {
  width: 100%;
}

.hero-section__content h1 {
  max-width: 18ch;
  margin: 0 auto 1rem;
  color: var(--color-primary);
  font-size: clamp(2rem, 8vw, 3.75rem);
  line-height: 1.15;
}

.hero-section__content p {
  max-width: 42rem;
  margin: 0 auto 1.75rem;
  color: var(--color-text-dark);
  font-size: clamp(1rem, 3vw, 1.125rem);
}

.hero-section__media picture,
.hero-section__media img {
  display: block;
  width: 100%;
}

.hero-section__media img {
  height: auto;
  border-radius: 1rem;
  object-fit: cover;
  box-shadow: 0 18px 40px rgb(13 136 196 / 20%);
}

.btn {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 8px;
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-secondary);
  color: var(--color-primary);
  font-weight: 700;
}

.btn-primary:hover {
  box-shadow: 0 10px 24px rgb(13 136 196 / 24%);
  transform: scale(1.05);
}

.core-values,
.course-showcase {
  padding-block: 4rem;
}

.course-showcase {
  background-color: rgb(13 136 196 / 6%);
}

.section-container {
  width: min(100% - 2rem, var(--container-max));
  margin-inline: auto;
}

.core-values h2,
.course-showcase h2 {
  margin: 0 0 2rem;
  color: var(--color-primary);
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  line-height: 1.2;
  text-align: center;
}

.core-values__grid,
.course-showcase__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.value-card,
.course-card {
  word-break: keep-all;
  white-space: normal;
}

.value-card h3,
.value-card p,
.course-card h3,
.course-card p,
.core-values h2,
.course-showcase h2 {
  word-break: keep-all;
  white-space: normal;
}

.value-card {
  padding: 2rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background-color: var(--color-surface);
  text-align: center;
}

.value-card__icon {
  display: inline-grid;
  width: 64px;
  height: 64px;
  margin-bottom: 1.25rem;
  place-items: center;
  border-radius: 50%;
  background-color: rgb(255 202 41 / 24%);
  color: var(--color-primary);
}

.value-card__icon svg {
  width: 34px;
  height: 34px;
  fill: currentcolor;
}

.value-card h3,
.course-card h3 {
  margin: 0 0 0.75rem;
  color: var(--color-text-dark);
  font-size: 1.25rem;
  line-height: 1.3;
}

.value-card p,
.course-card p {
  margin: 0;
  color: var(--color-text-muted);
}

.course-card {
  overflow: hidden;
  border-radius: 12px;
  background-color: var(--color-surface);
  box-shadow: 0 10px 30px rgb(51 51 51 / 10%);
}

.course-card > img {
  width: 100%;
  height: 220px;
  border-radius: 12px 12px 0 0;
  object-fit: cover;
}

.course-card__content {
  display: flex;
  min-height: 250px;
  flex-direction: column;
  align-items: flex-start;
  padding: 1.5rem;
}

.course-card__content p {
  margin-bottom: 1.5rem;
}

.course-card__content .btn {
  margin-top: auto;
}

.btn-outline {
  border: 2px solid var(--color-primary);
  background-color: transparent;
  color: var(--color-primary);
  font-weight: 700;
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-text-light);
}

.testimonials {
  padding-block: 4rem;
  background-color: #F8F9FA;
}

.testimonials h2 {
  margin: 0 0 2rem;
  color: var(--color-primary);
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  line-height: 1.2;
  text-align: center;
  word-break: keep-all;
  white-space: normal;
}

.testimonial-slider {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding: 0.5rem 0 1.5rem;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}

.testimonial-slider::-webkit-scrollbar {
  display: none;
}

.testimonial-card {
  display: flex;
  flex: 0 0 85%;
  flex-direction: column;
  padding: 1.75rem;
  border-radius: 12px;
  background-color: var(--color-surface);
  box-shadow: 0 8px 24px rgb(51 51 51 / 10%);
  scroll-snap-align: center;
  word-break: keep-all;
  white-space: normal;
}

.stars {
  margin-bottom: 1rem;
  color: var(--color-secondary);
  font-size: 1.25rem;
  letter-spacing: 0.15em;
  line-height: 1;
}

.quote {
  margin: 0 0 1.5rem;
  color: var(--color-text-dark);
  font-size: 1rem;
  font-style: italic;
  line-height: 1.7;
  word-break: keep-all;
  white-space: normal;
}

.author-info {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin-top: auto;
}

.author-info img {
  width: 56px;
  height: 56px;
  flex: 0 0 56px;
  border-radius: 50%;
  object-fit: cover;
}

.author-info strong,
.author-info small {
  display: block;
  word-break: keep-all;
  white-space: normal;
}

.author-info strong {
  color: var(--color-text-dark);
}

.author-info small {
  margin-top: 0.125rem;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}

.lead-capture {
  padding-block: 4rem;
  background-color: rgb(255 202 41 / 18%);
}

.lead-capture__intro {
  max-width: 600px;
  margin: 0 auto 2rem;
  text-align: center;
}

.lead-capture h2 {
  margin: 0 0 0.75rem;
  color: var(--color-primary);
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  line-height: 1.2;
}

.lead-capture p {
  margin: 0;
  color: var(--color-text-dark);
}

#registration-form {
  max-width: 600px;
  margin-inline: auto;
  padding: 1.5rem;
  border-radius: 12px;
  background-color: var(--color-surface);
  box-shadow: 0 10px 30px rgb(51 51 51 / 10%);
}

.form-group label {
  display: block;
  margin-bottom: 0.375rem;
  color: var(--color-text-dark);
  font-weight: 700;
}

.form-group input,
.form-group select {
  width: 100%;
  min-height: 44px;
  margin-bottom: 15px;
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 8px;
  background-color: var(--color-surface);
  color: var(--color-text-dark);
}

#registration-form .btn {
  width: 100%;
  border: 0;
  cursor: pointer;
}

.lead-capture,
.lead-capture h2,
.lead-capture p,
.lead-capture label,
.lead-capture input,
.lead-capture select,
.site-footer,
.site-footer h2,
.site-footer p,
.site-footer a {
  word-break: keep-all;
  white-space: normal;
}

.site-footer {
  background-color: var(--color-primary);
  color: var(--color-text-light);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  width: min(100% - 2rem, var(--container-max));
  margin-inline: auto;
  padding-block: 3rem;
}

.site-footer__brand {
  display: inline-block;
  margin-bottom: 1rem;
  font-size: 1.25rem;
  font-weight: 700;
}

.site-footer__column h2 {
  margin: 0 0 1rem;
  font-size: 1.125rem;
}

.site-footer__contact {
  font-style: normal;
}

.site-footer__contact p {
  margin: 0 0 0.5rem;
}

.site-footer a {
  color: var(--color-text-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer a:hover {
  color: var(--color-secondary);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.site-footer__links a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
}

.site-footer__social-placeholder {
  padding: 1rem;
  border: 1px dashed rgb(255 255 255 / 55%);
  border-radius: 8px;
}

.site-footer__social-placeholder p {
  margin: 0;
}

.site-footer__social-placeholder p + p {
  margin-top: 0.5rem;
}

.site-footer__copyright {
  padding: 1rem;
  border-top: 1px solid rgb(255 255 255 / 22%);
  text-align: center;
}

.site-footer__copyright p {
  margin: 0;
  font-size: 0.875rem;
}

.breadcrumbs {
  padding: 15px 20px;
  background-color: #f8f9fa;
  font-size: 0.9rem;
}

.breadcrumbs ul {
  display: flex;
  width: min(100%, var(--container-max));
  margin: 0 auto;
  padding: 0;
  gap: 8px;
  list-style: none;
}

.breadcrumbs li {
  display: inline;
}

.breadcrumbs li + li::before {
  padding-right: 8px;
  color: #6c757d;
  content: "›";
}

.breadcrumbs a {
  color: var(--color-primary);
  text-decoration: none;
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

.about-history,
.about-mission,
.about-core-values,
.course-hero,
.course-details {
  padding-block: 3.5rem;
}

.about-history,
.course-hero {
  background: linear-gradient(180deg, rgb(13 136 196 / 10%), var(--color-surface));
  text-align: center;
}

.about-mission,
.course-details {
  background-color: #f8f9fa;
}

.about-page section > .section-container,
.course-page section > .section-container {
  max-width: 900px;
}

.about-page h1,
.course-page h1 {
  margin: 0 0 1rem;
  color: var(--color-primary);
  font-size: clamp(2rem, 8vw, 3.5rem);
  line-height: 1.15;
}

.about-page h2,
.course-page h2 {
  margin: 0 0 1rem;
  color: var(--color-primary);
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  line-height: 1.2;
}

.about-page p,
.course-page p,
.course-page li {
  color: var(--color-text-dark);
  line-height: 1.7;
}

.course-details ul {
  margin: 0;
  padding-left: 1.25rem;
}

.course-details li + li {
  margin-top: 0.75rem;
}

p,
h1,
h2,
h3,
li {
  word-break: keep-all;
  white-space: normal;
}

.blog-index {
  width: min(100% - 2rem, var(--container-max));
  margin-inline: auto;
  padding-block: 3.5rem;
}

.blog-index > h1 {
  margin: 0 0 2rem;
  color: var(--color-primary);
  font-size: clamp(2rem, 8vw, 3.5rem);
  line-height: 1.15;
  text-align: center;
}

.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.blog-card {
  overflow: hidden;
  border-radius: 12px;
  background-color: var(--color-surface);
  box-shadow: 0 10px 30px rgb(51 51 51 / 10%);
}

.blog-card > img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.blog-card__content {
  padding: 1.5rem;
}

.blog-card .category {
  margin: 0 0 0.5rem;
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
}

.blog-card h2 {
  margin: 0 0 0.75rem;
  color: var(--color-text-dark);
  font-size: 1.35rem;
  line-height: 1.3;
}

.blog-card p:not(.category) {
  margin: 0 0 1rem;
  color: var(--color-text-muted);
}

.read-more {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-primary);
  font-weight: 700;
  text-decoration: none;
}

.read-more:hover {
  text-decoration: underline;
}

.seo-article-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

.seo-article {
  padding-block: 2rem;
}

.seo-article,
.seo-article p,
.seo-article h1,
.seo-article h2,
.seo-article h3,
.seo-article li,
.seo-article a,
.seo-article strong {
  word-break: keep-all;
  white-space: normal;
  line-height: 1.6;
}

.seo-article h1 {
  margin: 0 0 1rem;
  color: var(--color-primary);
  font-size: clamp(2rem, 8vw, 3.25rem);
  line-height: 1.2;
}

.seo-article h2 {
  margin: 2.5rem 0 0.75rem;
  color: var(--color-primary);
}

.seo-article h3 {
  margin: 2rem 0 0.75rem;
  color: var(--color-text-dark);
}

.seo-article .sapo {
  color: var(--color-text-dark);
  font-size: 1.125rem;
  font-weight: 500;
}

.table-of-contents {
  margin-block: 2rem;
  padding: 15px;
  border-radius: 8px;
  background-color: #f8f9fa;
}

.table-of-contents h3 {
  margin-top: 0;
}

.table-of-contents a {
  color: var(--color-primary);
  text-decoration: none;
}

.table-of-contents a:hover {
  text-decoration: underline;
}

.author-box {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 2px solid #eee;
}

.author-box img {
  width: 72px;
  height: 72px;
  flex: 0 0 72px;
  border-radius: 50%;
  object-fit: cover;
}

.author-box p {
  margin: 0.25rem 0 0;
  color: var(--color-text-muted);
}

.seo-article-container > .lead-capture {
  margin-inline: -20px;
}

.seo-img {
  width: 100%;
  max-width: 800px;
  height: auto;
  border-radius: 12px;
  margin: 20px auto;
  display: block;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

@media (min-width: 1024px) {
  .navbar {
    min-height: 88px;
  }

  .navbar__toggle {
    display: none;
  }

  .navbar__menu {
    position: static;
    display: flex;
    max-height: none;
    visibility: visible;
    overflow: visible;
    flex-direction: row;
    align-items: center;
    gap: 0.25rem;
    padding: 0;
    border: 0;
    box-shadow: none;
    opacity: 1;
    transform: none;
  }

  .has-dropdown {
    position: relative;
  }

  .submenu {
    position: absolute;
    z-index: 10;
    top: 100%;
    left: 0;
    display: flex;
    width: max-content;
    min-width: 250px;
    visibility: hidden;
    gap: 0;
    margin-top: 0;
    padding: 15px;
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: all 0.3s ease;
  }

  .has-dropdown:hover .submenu,
  .has-dropdown:focus-within .submenu {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .submenu a {
    padding-inline: 0.75rem;
    border-radius: var(--radius-sm);
    color: var(--color-text-dark);
  }

  .submenu a:hover {
    color: var(--color-primary);
  }

  .navbar__link--cta {
    margin-top: 0;
    margin-left: 0.5rem;
    padding-inline: 1.25rem;
  }

  .hero-section {
    padding-block: 5rem;
  }

  .hero-section__container {
    flex-direction: row;
    gap: 4rem;
    text-align: left;
  }

  .hero-section__content,
  .hero-section__media {
    width: 50%;
  }

  .hero-section__content h1,
  .hero-section__content p {
    margin-left: 0;
  }

  .core-values,
  .course-showcase {
    padding-block: 5rem;
  }

  .core-values__grid,
  .course-showcase__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
  }

  .testimonials {
    padding-block: 5rem;
  }

  .testimonial-slider {
    overflow-x: visible;
  }

  .testimonial-card {
    flex: 0 0 calc(33.333% - 20px);
  }

  .lead-capture {
    padding-block: 5rem;
  }

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

  .about-history,
  .about-mission,
  .about-core-values,
  .course-hero,
  .course-details {
    padding-block: 5rem;
  }

  .about-history,
  .course-hero {
    text-align: left;
  }

  .blog-index {
    padding-block: 5rem;
  }

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

  .seo-article {
    padding-block: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* Custom Modal Form */
.custom-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.custom-modal-overlay.is-active {
  opacity: 1;
  visibility: visible;
}

.custom-modal {
  background-color: var(--color-surface);
  padding: 2.5rem 2rem;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  text-align: center;
  max-width: 420px;
  width: 90%;
  transform: translateY(-20px) scale(0.95);
  transition: transform 0.3s ease;
}

.custom-modal-overlay.is-active .custom-modal {
  transform: translateY(0) scale(1);
}

.custom-modal-icon {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  font-size: 2rem;
  margin-bottom: 1.25rem;
}

.custom-modal-icon.success {
  background-color: rgba(40, 167, 69, 0.15);
  color: #28a745;
}

.custom-modal-icon.error {
  background-color: rgba(220, 53, 69, 0.15);
  color: #dc3545;
}

.custom-modal h3 {
  margin: 0 0 0.5rem;
  color: var(--color-primary);
  font-size: 1.5rem;
  line-height: 1.3;
}

.custom-modal p {
  color: var(--color-text-dark);
  margin: 0 0 1.5rem;
}

.custom-modal button {
  width: 100%;
}

/* 404 Page */
.page-404 {
  padding-block: 8rem;
  text-align: center;
}
.page-404 h1 {
  font-size: clamp(4rem, 10vw, 8rem);
  color: var(--color-secondary);
  line-height: 1;
  margin-bottom: 1rem;
}
.page-404 h2 {
  color: var(--color-primary);
  margin-bottom: 1rem;
}
.page-404 p {
  max-width: 500px;
  margin: 0 auto 2rem;
}


/* Floating Action Buttons */
.floating-action-buttons {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 15px;
  z-index: 999;
}

.fab-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-decoration: none;
  font-size: 24px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  transition: transform 0.3s ease;
}

.fab-btn:hover {
  transform: scale(1.1);
}

.fab-hotline {
  background-color: #dc3545;
  animation: pulse-ring 2s infinite;
}

.fab-zalo {
  background-color: #0068ff;
}

.fab-messenger {
  background-color: #0084ff;
}

@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(220, 53, 69, 0.7); }
  70% { box-shadow: 0 0 0 15px rgba(220, 53, 69, 0); }
  100% { box-shadow: 0 0 0 0 rgba(220, 53, 69, 0); }
}

.fab-btn svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}