/* === Reset === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0 solid #e5e7eb;
}

html {
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body {
  line-height: inherit;
  color: #222;
  min-height: 100vh;
}

a {
  color: #333;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  font: inherit;
  color: inherit;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* === Container === */
.container {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

/* === Header === */
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  width: 100%;
  height: 4rem;
  background: #fff;
  transition: all 0.3s;
  flex-shrink: 0;
}

.header.scrolled {
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 1rem;
}

/* === Logo === */
.logo {
  display: flex;
  align-items: center;
  height: 100%;
  overflow: hidden;
  width: 8rem;
}

.logo-img {
  width: 100%;
  object-fit: contain;
}

/* === Navigation === */
.nav {
  transform: translateX(100%);
  position: fixed;
  width: 100%;
  left: 0;
  bottom: 0;
  right: 0;
  top: 4rem;
  z-index: 10;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #fff;
  transition: transform 0.3s;
}

.nav.open {
  transform: translateX(0);
}

.nav-list {
  flex: 1;
  overflow-y: auto;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 1rem;
  position: relative;
  transition: all 0.2s;
  color: #222;
}

.nav-link::after {
  content: "";
  display: block;
  position: absolute;
  bottom: 0;
  right: 0;
  width: 0;
  height: 2px;
  transition: all 0.2s;
}

.nav-link.active,
.nav-link:hover {
  color: #7260af;
}

.nav-link.active::after,
.nav-link:hover::after {
  left: 0;
  width: 100%;
  background: #7260af;
}

.nav-link:active {
  background: rgba(140, 129, 211, 0.2);
}

/* === Hamburger === */
.hamburger {
  display: block;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.75rem;
  border-radius: 0.375rem;
  outline: none;
}

.hamburger:active {
  background: #f3f4f6;
}

.hamburger-icon {
  display: block;
  width: 26px;
}

.hamburger-icon span {
  display: block;
  height: 2px;
  background: #121212;
  transition: all 0.3s;
}

.hamburger-icon span:nth-child(2) {
  margin: 6px 0;
}

.hamburger.active .hamburger-icon {
  height: 26px;
}

.hamburger.active .hamburger-icon span:first-child {
  transform: rotate(45deg) translate(9px, 8px);
}

.hamburger.active .hamburger-icon span:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger-icon span:nth-child(3) {
  transform: rotate(-45deg) translate(3px, -3px);
}

.header-right {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  column-gap: 2.5rem;
  margin-left: auto;
}

/* === Desktop Nav === */
@media (min-width: 1024px) {
  .header {
    height: auto;
    padding: 1.5rem 0;
  }

  .header-inner {
    padding: 0;
  }

  .logo {
    width: 13rem;
  }

  .nav {
    position: static;
    transform: none;
    background: transparent;
    flex-direction: row;
    width: auto;
    height: auto;
    overflow: hidden;
    margin-left: auto;
    top: auto;
  }

  .nav-list {
    display: flex;
    column-gap: 2.5rem;
    height: 100%;
  }

  .nav-link {
    font-size: 1.125rem;
    font-weight: 700;
    height: 100%;
    padding: 0.5rem;
  }

  .nav-link::after {
    bottom: 0.5rem;
  }

  .nav-link:active {
    background: transparent;
  }

  .hamburger,
  .header-right {
    display: none;
  }
}

/* === Hero Section === */
.section-hero {
  padding: 1rem 0;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-title {
  font-size: 1.875rem;
  line-height: 2.25rem;
  padding: 1.5rem;
  color: #49406f;
  font-weight: 700;
}

.hero-image {
  border-radius: 9999px;
  width: 100%;
  object-fit: cover;
}

@media (min-width: 1024px) {
  .section-hero {
    padding: 8rem 0;
  }

  .hero-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .hero-title {
    font-size: 2.25rem;
    line-height: 54px;
    padding: 0;
  }

  .hero-image {
    width: 700px;
    flex-shrink: 0;
  }
}

@media (min-width: 1280px) {
  .hero-title {
    font-size: 3rem;
    line-height: 60px;
  }
}

/* === Sections Common === */
.section-purple {
  padding: 1rem 0;
  background: #7260af;
  color: #fff;
}

.section-white {
  padding: 1rem 0;
}

.section-wide {
  padding: 1rem 0;
}

.section-mb {
  margin-bottom: 2.5rem;
}

.section-inner {
  display: flex;
  flex-direction: column;
  padding: 0.75rem;
}

.section-heading {
  text-align: center;
  font-size: 1.25rem;
  line-height: 1.75rem;
  font-weight: 700;
  padding: 1rem 0;
}

.heading-dark {
  color: #49406f;
}

.section-desc {
  text-indent: 2em;
  line-height: 2;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.desc-dark {
  color: #374151;
}

.desc-sm {
  text-indent: 2em;
}

.section-text {
  flex: 1;
}

.section-list {
  text-align: left;
  display: inline-block;
  letter-spacing: 0.05em;
}

/* Section images */
.section-img-wrap {
  width: 100%;
}

.section-img {
  width: 100%;
  object-fit: cover;
  border-radius: 0.75rem;
}

.section-img-square {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 0.75rem;
}

.section-img-wide {
  width: 100%;
  border-radius: 0.75rem;
  object-fit: cover;
}

@media (min-width: 1024px) {
  .section-purple {
    padding: 2.5rem 0;
  }

  .section-white {
    padding: 2.5rem 0;
  }

  .section-wide {
    padding: 8rem 0;
  }

  .section-mb {
    margin-bottom: 0;
  }

  .section-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .section-heading {
    font-size: 1.875rem;
    line-height: 2.25rem;
  }

  .section-desc {
    font-size: 1.125rem;
    line-height: 1.75rem;
  }

  .section-purple .section-desc {
    font-size: 1.25rem;
    line-height: 2;
  }

  .section-img-wrap {
    width: 600px;
    flex-shrink: 0;
  }

  .section-img-square {
    width: 500px;
    flex-shrink: 0;
  }

  .section-img-wide {
    width: 700px;
    flex-shrink: 0;
  }

  .img-rotate-left {
    transform: rotate(-1deg);
  }

  .img-rotate-right {
    transform: rotate(1deg);
  }

  .section-text-right {
    margin-left: 5rem;
  }

  .section-white .section-text {
    margin-right: 5rem;
  }

  .section-heading.heading-dark {
    text-align: center;
    margin-bottom: 2.5rem;
  }

  .section-purple .section-heading:not(.heading-dark) {
    margin-bottom: 2.5rem;
  }

  .section-list .section-desc {
    font-size: 1.125rem;
  }

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

@media (min-width: 1280px) {
  .section-wide .section-heading {
    font-size: 1.875rem;
  }
}

/* === Footer === */
.footer {
  background: #000;
  margin-top: auto;
}

.footer .container {
  padding: 0 1rem;
}

.footer-main {
  display: flex;
  flex-direction: column;
  padding: 1.25rem 0;
}

.footer-brand {
  text-align: center;
  margin-bottom: 2.5rem;
}

.footer-logo-wrap {
  text-align: center;
  margin-bottom: 2.5rem;
}

.footer-logo-img {
  width: 10rem;
  object-fit: contain;
  margin: 0 auto;
}

.footer-slogan {
  color: #fff;
  font-size: 1.25rem;
}

.footer-wechat {
  position: relative;
  width: 2.5rem;
  display: block;
  margin: 0 auto;
}

.wechat-trigger {
  display: block;
  position: relative;
}

.wechat-icon {
  width: 2.5rem;
  display: block;
  background: #fff;
  border-radius: 9999px;
  cursor: pointer;
}

.wechat-popup {
  width: 10rem;
  position: absolute;
  bottom: 100%;
  transform: translateY(-0.25rem) translateX(-50%);
  left: 50%;
  padding: 0.75rem;
  background: #fff;
  border-radius: 0.375rem;
  display: none;
}

.wechat-popup::after {
  content: "";
  display: block;
  position: absolute;
  bottom: -0.5rem;
  width: 0;
  height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-top: 8px solid #fff;
  left: 50%;
  transform: translateX(-50%);
}

.wechat-trigger:hover .wechat-popup {
  display: block;
}

.wechat-qr {
  border-radius: 0.375rem;
}

/* Footer Nav */
.footer-nav {
  color: #fff;
  border-top: 1px solid rgba(255,255,255,0.7);
  margin-top: 5rem;
}

.footer-nav-group {
  border-bottom: 1px solid rgba(255,255,255,0.7);
  padding: 0.75rem 0;
}

.footer-nav-title {
  display: block;
  color: #fff;
  padding: 0.5rem;
  font-size: 1.125rem;
}

.footer-nav-title:hover {
  color: #8c81d3;
}

.footer-sub-list {
  margin-top: 0.75rem;
}

.footer-sub-list li {
  padding: 0.5rem;
}

.footer-sub-list a {
  color: #fff;
  font-size: 1rem;
  border-bottom: 1px solid #fff;
  padding-bottom: 2px;
}

.footer-sub-list a:hover {
  color: #8c81d3;
  border-bottom-color: #8c81d3;
}

/* Footer Bottom */
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 1.5rem 0;
}

.footer-address {
  text-align: center;
  padding: 0.25rem 0;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.6);
}

.footer-icp {
  text-align: center;
  padding: 0.25rem 0;
  font-size: 0.875rem;
}

.footer-icp a {
  color: rgba(255,255,255,0.6);
}

.footer-icp a:hover {
  color: #fff;
}

@media (min-width: 1024px) {
  .footer .container {
    padding: 0;
  }

  .footer-main {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem 0;
  }

  .footer-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 2.5rem;
    border-top: none;
    margin-top: 0;
  }

  .footer-nav-group {
    border-bottom: none;
    padding: 0;
  }
}

/* === Scroll Animations === */
[data-animate] {
  opacity: 0;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate="fade-right"] {
  transform: translate3d(-80px, 0, 0);
}

[data-animate="fade-left"] {
  transform: translate3d(80px, 0, 0);
}

[data-animate].aos-animate {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

/* === Utilities === */
strong {
  font-weight: 700;
}

@media (max-width: 1023px) {
  .section-inner {
    gap: 1rem;
  }
}

/* === Shared Inner Pages === */
.page-hero {
  background: #7260af;
  color: #fff;
  padding: 2.5rem 0;
}

.page-hero-inner {
  padding: 2.5rem 1rem;
}

.page-hero-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.page-hero-desc {
  font-size: 0.875rem;
  line-height: 1.75;
  letter-spacing: 0.03em;
}

.content-section {
  padding: 1rem 0;
}

.content-section-gray {
  background: #f9fafb;
}

.content-block {
  padding: 0 1rem;
}

.section-title-lg {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin: 0.75rem 0 1.5rem;
}

.lead-text {
  font-size: 0.875rem;
  line-height: 1.9;
  margin-bottom: 1rem;
}

.subtle-text {
  color: #4b5563;
}

.card {
  background: #fff;
  border-radius: 0.75rem;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.08);
}

.card-body {
  padding: 1.5rem;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.card-subtitle {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.bullet-list {
  list-style: disc;
  list-style-position: inside;
}

.bullet-list li {
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  line-height: 1.7;
}

.inline-link {
  color: #7260af;
}

.inline-link:hover {
  color: #57498a;
}

.course-layout {
  display: block;
}

.course-list {
  flex: 1;
}

.course-item {
  margin-bottom: 1.5rem;
}

.course-header {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.course-body {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: #374151;
}

.course-image-wrap {
  padding: 0.5rem;
  margin-bottom: 0.25rem;
  background: #f3f4f6;
  border-radius: 0.5rem;
}

.course-image {
  width: 100%;
  border-radius: 0.5rem;
}

.course-sidebar {
  display: none;
}

.course-unit-item {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  background: #fff;
  color: #4b5563;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.course-unit-item:hover {
  color: #111827;
  background: #f3f4f6;
}

.qa-item {
  margin-bottom: -1px;
}

.qa-question {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem;
  border: 1px solid #d1d5db;
  background: #fff;
  color: #6b7280;
  font-weight: 500;
  text-align: left;
}

.qa-question.is-open {
  color: #111827;
}

.qa-icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

.qa-caret {
  width: 0.75rem;
  height: 0.75rem;
  margin-left: auto;
  transition: transform 0.2s;
}

.qa-question.is-open .qa-caret {
  transform: rotate(180deg);
}

.qa-answer {
  display: none;
  padding: 1.25rem;
  border: 1px solid #d1d5db;
  border-top: 0;
  background: #fff;
}

.qa-answer.is-open {
  display: block;
}

.qa-answer p {
  text-indent: 2em;
  line-height: 2;
  color: #111827;
  margin-bottom: 0.5rem;
}

.pbl-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

.gallery-strip {
  position: relative;
  width: 100%;
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding: 2.5rem 1rem;
  scroll-snap-type: x mandatory;
}

.gallery-item {
  scroll-snap-align: center;
  flex-shrink: 0;
  width: 11rem;
  display: inline-block;
  aspect-ratio: 1;
}

.gallery-item img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 0.5rem;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.business-layout,
.about-layout,
.platform-layout {
  display: block;
}

.sidebar-menu {
  margin-bottom: 0.75rem;
}

.sidebar-menu-inner {
  background: #fff;
  padding: 0.5rem;
  border-radius: 0.5rem;
}

.sidebar-link,
.menu-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  color: #4b5563;
  font-size: 0.875rem;
}

.sidebar-link:hover,
.menu-link:hover {
  color: #111827;
  background: #f3f4f6;
}

.sidebar-link.active,
.menu-link.active {
  background: #7260af;
  color: #fff;
}

.sidebar-arrow {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.content-panel,
.about-panel {
  background: #fff;
  border-radius: 0.5rem;
  width: 100%;
}

.content-panel-inner,
.about-panel-inner {
  padding: 1rem;
}

.content-panel h3,
.about-panel h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.stack-section {
  margin-bottom: 1.5rem;
}

.stack-section:last-child {
  margin-bottom: 0;
}

.teacher-grid {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.teacher-card {
  padding: 1rem;
  border-radius: 0.75rem;
  background: #e7e8f8;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.teacher-photo-wrap {
  width: 8rem;
  height: 8rem;
  margin: -2.5rem auto 1.5rem;
  overflow: hidden;
  border-radius: 9999px;
}

.teacher-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease-in-out;
}

.teacher-card:hover .teacher-photo {
  transform: scale(1.1);
}

.teacher-name {
  text-align: center;
  margin-bottom: 0.75rem;
  font-size: 1rem;
  letter-spacing: 0.05em;
}

.teacher-bio {
  color: #6b7280;
  letter-spacing: 0.03em;
  text-indent: 2em;
  line-height: 1.9;
}

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

.contact-line {
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.contact-qr-wrap {
  width: 15rem;
  margin: 0 auto;
  text-align: center;
}

.contact-qr {
  display: block;
  width: 15rem;
  border-radius: 0.375rem;
}

.contact-qr-note {
  margin-top: 0.75rem;
  font-size: 1rem;
}

.jobs-accordion .qa-question {
  color: #111827;
}

.jobs-accordion .qa-answer {
  display: block;
}

.platform-copy {
  border-radius: 0.5rem;
}

.platform-copy p {
  text-indent: 2em;
  text-align: justify;
  color: #374151;
  margin-bottom: 1rem;
  line-height: 1.9;
}

.platform-media {
  overflow: hidden;
  box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.9);
}

.platform-media h3 {
  font-size: 1.25rem;
  font-weight: 700;
}

.platform-media img {
  width: 100%;
  object-fit: cover;
}

.platform-sticky-cta {
  text-align: center;
  padding: 0.75rem 0;
  position: sticky;
  bottom: 0;
  right: 0;
  left: 0;
  z-index: 4;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(4px);
  box-shadow: 0 1px 2px #000;
}

.cta-button {
  display: inline-block;
  color: #fff;
  background: #7260af;
  border-radius: 9999px;
  font-size: 1rem;
  padding: 0.75rem 2rem;
  font-weight: 500;
}

.cta-button:hover {
  background: #57498a;
}

@media (min-width: 768px) {
  .pbl-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-hero {
    padding: 10rem 0;
  }

  .page-hero-inner {
    padding: 2.5rem 1rem 5rem;
  }

  .page-hero-title {
    font-size: 2.25rem;
    margin-bottom: 2.5rem;
  }

  .page-hero-desc {
    font-size: 1.125rem;
    line-height: 2;
  }

  .content-section {
    padding: 2.5rem 0;
  }

  .content-block {
    padding: 0 2.5rem;
  }

  .section-title-lg {
    font-size: 2.25rem;
    margin-top: 2.5rem;
    margin-bottom: 3.5rem;
  }

  .lead-text {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
  }

  .course-layout,
  .business-layout,
  .about-layout,
  .platform-layout {
    display: flex;
  }

  .course-sidebar {
    display: block;
    width: 20rem;
    margin-left: 2.5rem;
  }

  .course-sidebar-inner {
    position: sticky;
    top: 105px;
    padding: 0.5rem 0;
  }

  .course-sidebar-inner li + li {
    margin-top: 0.5rem;
  }

  .sidebar-menu {
    margin-bottom: 0;
  }

  .sidebar-menu-inner {
    width: 18rem;
  }

  .sidebar-link,
  .menu-link {
    font-size: 1.125rem;
  }

  .content-panel,
  .about-panel {
    margin-left: 1.25rem;
    flex: 1;
  }

  .content-panel-inner,
  .about-panel-inner {
    padding: 2.5rem;
  }

  .about-panel {
    padding-bottom: 8rem;
  }

  .teacher-grid {
    flex-direction: row;
  }

  .teacher-card {
    flex: 1;
  }

  .teacher-photo-wrap {
    width: 10rem;
    height: 10rem;
    margin-top: -3.5rem;
  }

  .teacher-name {
    font-size: 1.25rem;
  }

  .teacher-bio,
  .platform-copy p,
  .contact-line,
  .bullet-list li {
    font-size: 1.125rem;
  }

  .gallery-strip {
    gap: 2.5rem;
    padding: 2.5rem;
  }

  .gallery-item {
    width: 280px;
  }

  .platform-copy {
    width: 50%;
  }

  .platform-media {
    width: 50%;
    margin-left: 2.5rem;
  }

  .platform-sticky-cta {
    padding: 1.5rem 0;
  }

  .cta-button {
    font-size: 1.125rem;
    padding: 1rem 2.5rem;
  }
}