@import url('https://fonts.googleapis.com/css2?family=Noto+Sans:wght@400;500;600&family=Noto+Serif:wght@400;600;700&display=swap');

:root {
  --mahogany: #4B2C20;
  --mahogany-dark: #3E2723;
  --maroon: #5D4037;
  --gold: #D4AF37;
  --gold-light: #C5A059;
  --wall-yellow: #FFF9E3;
  --wall-yellow-dark: #F5F0DC;
  --saffron: #E8963C;
  --cream: #F0E8DA;
  --text: #3E2723;
  --text-muted: #6B5344;
  --text-on-dark: #FFF9E3;
  --shadow: rgba(62, 39, 35, 0.15);
  --font-heading: 'Noto Serif', Georgia, serif;
  --font-body: 'Noto Sans', system-ui, sans-serif;
  --section-padding: 4rem 1.5rem;
  --container-max: 72rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--wall-yellow);
}

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

a {
  color: var(--maroon);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--saffron);
  text-decoration: underline;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.text-en {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: -0.25rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--mahogany);
  border-bottom: 3px solid var(--gold);
  box-shadow: 0 4px 12px var(--shadow);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  text-decoration: none;
  color: inherit;
}

.logo:hover {
  text-decoration: none;
}

.logo-vi {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.logo-en {
  display: block;
  font-size: 0.75rem;
  color: var(--cream);
  letter-spacing: 0.06em;
  opacity: 0.85;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.main-nav a {
  font-weight: 500;
  color: var(--text-on-dark);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}

.main-nav a:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
  text-decoration: none;
}

/* Hero */
.hero {
  position: relative;
  min-height: 72vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(62, 39, 35, 0.88) 0%,
    rgba(75, 44, 32, 0.55) 45%,
    rgba(75, 44, 32, 0.25) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 3rem 1.5rem 4rem;
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  text-align: center;
}

.hero-affiliation {
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 0.5rem;
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.25rem, 6vw, 3.5rem);
  font-weight: 700;
  color: var(--gold);
  margin: 0;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.4);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-on-dark);
  margin: 0.25rem 0 1rem;
  letter-spacing: 0.08em;
}

.hero-tagline {
  font-size: 1rem;
  color: var(--cream);
  margin: 0;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--gold-light);
  display: inline-block;
  background: rgba(62, 39, 35, 0.5);
}

/* Sections */
.section {
  padding: var(--section-padding);
}

.section:nth-child(even) {
  background: var(--wall-yellow-dark);
}

.section-title {
  margin: 0 0 2rem;
  text-align: center;
}

.title-vi {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--gold);
  background: var(--mahogany);
  padding: 0.5rem 1.75rem;
  border: 2px solid var(--gold-light);
  box-shadow: inset 0 0 0 1px rgba(212, 175, 55, 0.3);
}

.title-en {
  display: block;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
}

/* About */
.about-text {
  max-width: 42rem;
  margin: 0 auto;
  padding-left: 1rem;
  border-left: 4px solid var(--gold);
}

.about-text p {
  margin: 0 0 1.25rem;
}

.about-text p:last-child {
  margin-bottom: 0;
}

/* Architecture */
.architecture-gallery {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .architecture-gallery {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

.architecture-figure {
  margin: 0;
  position: relative;
}

.architecture-figure::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: linear-gradient(to bottom, var(--gold), var(--gold-light), var(--gold));
  z-index: 1;
}

.architecture-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 2px solid var(--maroon);
  box-shadow: 4px 4px 0 var(--gold-light);
}

.architecture-figure figcaption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  padding-left: 0.75rem;
}

.architecture-text {
  max-width: 42rem;
  margin: 0 auto;
}

.architecture-text p {
  margin: 0 0 1.25rem;
}

/* Grounds */
.grounds {
  background: var(--wall-yellow);
}

.grounds-split {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .grounds-split {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

.grounds-image {
  overflow: hidden;
  border: 3px solid var(--maroon);
  box-shadow: 0 0 0 3px var(--gold-light), 0 8px 24px var(--shadow);
}

.grounds-image img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.grounds-text .section-title {
  text-align: left;
}

.grounds-text p {
  margin: 0 0 1.25rem;
}

/* Visit */
.visit-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .visit-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.visit-map-preview {
  margin-top: 2rem;
  background: var(--mahogany);
  border: 2px solid var(--gold-light);
  padding: 1.25rem;
  box-shadow: 0 4px 16px var(--shadow);
}

.visit-map-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--gold);
  margin: 0 0 1rem;
  text-align: center;
}

.visit-map-title .card-en {
  display: block;
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--cream);
  opacity: 0.8;
}

.map-embed-wrap {
  border: 2px solid var(--maroon);
  box-shadow: 0 0 0 2px var(--gold-light);
  overflow: hidden;
  background: #fff;
}

.map-embed {
  display: block;
  width: 100%;
  height: 16rem;
  border: 0;
}

@media (min-width: 768px) {
  .map-embed {
    height: 22rem;
  }
}

.map-coords {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem 1.25rem;
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
  color: var(--cream);
}

.map-coords span {
  font-family: monospace;
  letter-spacing: 0.02em;
}

.map-coords-en {
  text-align: center;
  margin: 0.35rem 0 0;
}

.visit-map-preview a {
  color: var(--gold);
  font-weight: 600;
}

.visit-map-preview a:hover {
  color: var(--saffron);
}

.visit-card {
  background: var(--mahogany);
  border: 2px solid var(--gold-light);
  padding: 1.5rem;
  box-shadow: 0 4px 16px var(--shadow);
  color: var(--text-on-dark);
}

.visit-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--gold);
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gold-light);
}

.card-en {
  display: block;
  font-size: 0.8rem;
  color: var(--cream);
  opacity: 0.8;
}

.visit-card p {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
}

.visit-card p:last-child {
  margin-bottom: 0;
}

.visit-card .text-en {
  color: rgba(240, 232, 218, 0.75);
}

.visit-note {
  font-size: 0.85rem !important;
  font-style: italic;
  opacity: 0.85;
}

.visit-map a,
.visit-card a {
  font-weight: 600;
  color: var(--gold);
}

.visit-map a:hover,
.visit-card a:hover {
  color: var(--saffron);
  text-decoration: none;
}

/* Footer */
.site-footer {
  background: var(--mahogany-dark);
  color: var(--cream);
  padding: 2.5rem 1.5rem;
  text-align: center;
  border-top: 3px solid var(--gold);
}

.footer-affiliation {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 0.5rem;
  color: var(--gold);
}

.footer-name {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin: 0 0 1rem;
}

.footer-copy {
  font-size: 0.8rem;
  margin: 0;
  opacity: 0.7;
}

.main-nav a[aria-current="page"] {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* Page hero (inner pages) */
.page-hero {
  background: var(--mahogany);
  color: var(--text-on-dark);
  padding: 3rem 1.5rem;
  text-align: center;
  border-bottom: 3px solid var(--gold);
}

.page-title {
  margin: 0 0 0.75rem;
}

.page-title .title-vi {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--gold);
}

.page-title .title-en {
  display: block;
  font-size: 0.95rem;
  color: var(--cream);
  margin-top: 0.5rem;
  opacity: 0.85;
}

.page-intro {
  margin: 0;
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
  color: var(--cream);
  opacity: 0.9;
}

/* Feeds */
.feed-list {
  display: grid;
  gap: 2rem;
  max-width: 48rem;
  margin: 0 auto;
}

.feed-card {
  background: #fff;
  border: 2px solid var(--gold-light);
  box-shadow: 0 4px 16px var(--shadow);
  overflow: hidden;
}

.feed-card-image img {
  display: block;
  width: 100%;
  height: auto;
}

.feed-carousel {
  position: relative;
  background: var(--mahogany-dark);
}

.feed-carousel-viewport {
  overflow: hidden;
  width: 100%;
}

.feed-carousel-track {
  display: flex;
  width: 100%;
  transition: transform 0.35s ease;
}

.feed-carousel-slide {
  flex: 0 0 100%;
  width: 100%;
  min-width: 100%;
}

.feed-carousel-slide img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 36rem;
  object-fit: contain;
  background: #1a1210;
}

.feed-carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 2.5rem;
  height: 2.5rem;
  border: 2px solid var(--gold-light);
  background: rgba(62, 39, 35, 0.85);
  color: var(--cream);
  font-size: 1.15rem;
  line-height: 1;
  cursor: pointer;
}

.feed-carousel-btn:hover {
  background: var(--mahogany);
  color: var(--saffron);
}

.feed-carousel-prev {
  left: 0.65rem;
}

.feed-carousel-next {
  right: 0.65rem;
}

.feed-carousel-dots {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2.35rem;
  display: flex;
  justify-content: center;
  gap: 0.4rem;
  pointer-events: none;
}

.feed-carousel-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: rgba(240, 232, 218, 0.45);
}

.feed-carousel-dot.is-active {
  background: var(--gold);
}

.feed-carousel-count {
  position: absolute;
  right: 0.75rem;
  bottom: 0.65rem;
  margin: 0;
  padding: 0.2rem 0.55rem;
  font-size: 0.75rem;
  color: var(--cream);
  background: rgba(62, 39, 35, 0.75);
}

.feed-card-video video {
  display: block;
  width: 100%;
  height: auto;
  background: #000;
}

.feed-card-body {
  padding: 1.5rem;
}

.feed-date {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.feed-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  color: var(--mahogany);
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gold-light);
}

.feed-body {
  color: var(--text);
  line-height: 1.75;
}

.feed-body p {
  margin: 0 0 0.75rem;
}

/* Course */
.course-card {
  max-width: 52rem;
  margin: 0 auto;
}

.course-header {
  text-align: center;
  margin-bottom: 2rem;
}

.course-name {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2rem);
  color: var(--mahogany);
  margin: 0 0 0.5rem;
}

.course-name-en {
  margin: 0 0 0.75rem;
}

.course-dates {
  font-weight: 600;
  color: var(--maroon);
  margin: 0;
}

.course-summary,
.course-content {
  margin-bottom: 1.5rem;
  padding-left: 1rem;
  border-left: 4px solid var(--gold);
}

.course-pdf {
  margin: 2rem 0;
}

.course-pdf-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.course-pdf-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--mahogany);
  margin: 0;
}

.btn-download {
  display: inline-block;
  font-weight: 600;
  color: var(--gold) !important;
  background: var(--mahogany);
  padding: 0.65rem 1.25rem;
  border: 2px solid var(--gold-light);
  text-decoration: none !important;
}

.btn-download:hover {
  color: var(--saffron) !important;
}

.pdf-viewer {
  background: var(--mahogany-dark);
  border: 2px solid var(--gold-light);
  padding: 1rem;
}

.pdf-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.pdf-mode-toggle {
  display: flex;
  gap: 0.25rem;
  border: 1px solid var(--gold-light);
  padding: 0.15rem;
}

.pdf-mode-btn {
  font-family: var(--font-body);
  font-size: 0.75rem;
  padding: 0.4rem 0.75rem;
  border: none;
  background: transparent;
  color: var(--cream);
  cursor: pointer;
}

.pdf-mode-btn.active {
  background: var(--gold);
  color: var(--mahogany-dark);
}

.pdf-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.pdf-btn {
  font-size: 1rem;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--gold-light);
  background: transparent;
  color: var(--gold);
  cursor: pointer;
  line-height: 1;
}

.pdf-btn:hover {
  background: rgba(212, 175, 55, 0.15);
}

.pdf-page-info {
  font-size: 0.85rem;
  color: var(--cream);
  min-width: 6rem;
  text-align: center;
}

.pdf-stage {
  background: #fff;
  border: 2px solid var(--maroon);
  min-height: 12rem;
  display: flex;
  justify-content: center;
  overflow: auto;
}

.pdf-stage.pdf-stage-read {
  display: block;
  justify-content: initial;
  align-items: initial;
  padding: 1rem;
  max-height: 80vh;
  overflow-y: auto;
  overflow-x: hidden;
  overflow-anchor: none;
  -webkit-overflow-scrolling: touch;
}

.pdf-read-page-wrap {
  width: 100%;
  margin: 0 0 1.25rem;
  text-align: center;
}

.pdf-read-page-label {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.pdf-read-page {
  display: inline-block;
  vertical-align: top;
  max-width: 100%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

#pdf-canvas {
  max-width: 100%;
  height: auto;
}

.pdf-loading {
  text-align: center;
  color: var(--cream);
  font-size: 0.9rem;
  margin: 0.75rem 0 0;
}

.hidden {
  display: none !important;
}

.course-contact {
  margin-top: 2rem;
}

.course-contact h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--gold);
  margin: 0 0 1rem;
}

.empty-state {
  text-align: center;
  max-width: 28rem;
  margin: 0 auto;
  padding: 2rem;
  background: #fff;
  border: 2px solid var(--gold-light);
}

.empty-state p {
  margin: 0 0 0.75rem;
}

/* Chat widget (Hỏi đáp) */
.chat-widget {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 1000;
  font-family: var(--font-body);
}

.chat-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.1rem;
  border: 2px solid var(--gold-light);
  border-radius: 999px;
  background: var(--mahogany);
  color: var(--cream);
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(62, 39, 35, 0.35);
}

.chat-toggle:hover {
  background: var(--mahogany-dark);
  color: var(--saffron);
}

.chat-toggle-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--gold);
  color: var(--mahogany-dark);
  font-weight: 700;
  font-size: 0.95rem;
}

.chat-panel {
  position: absolute;
  right: 0;
  bottom: calc(100% + 0.75rem);
  width: min(22rem, calc(100vw - 2rem));
  max-height: min(32rem, calc(100vh - 6rem));
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 2px solid var(--gold-light);
  box-shadow: 0 8px 32px rgba(62, 39, 35, 0.25);
}

.chat-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1rem 0.75rem;
  background: var(--mahogany);
  color: var(--cream);
}

.chat-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.15rem;
}

.chat-subtitle {
  margin: 0.15rem 0 0;
  font-size: 0.8rem;
  opacity: 0.85;
}

.chat-close {
  border: 0;
  background: transparent;
  color: var(--cream);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0;
}

.chat-close:hover {
  color: var(--saffron);
}

.chat-body {
  padding: 1rem;
  overflow-y: auto;
  flex: 1;
}

.chat-intro {
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
  color: var(--text);
}

.chat-quick-list {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.chat-quick-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--gold-light);
  background: var(--wall-yellow);
  color: var(--mahogany);
  cursor: pointer;
  font: inherit;
}

.chat-quick-btn:hover {
  border-color: var(--gold);
  background: #fff;
}

.chat-quick-vi {
  display: block;
  font-weight: 600;
}

.chat-quick-en {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.8rem;
}

.chat-loading,
.chat-empty {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
  padding: 1rem 0;
}

.chat-back {
  border: 0;
  background: transparent;
  color: var(--maroon);
  font-weight: 600;
  padding: 0;
  margin-bottom: 0.75rem;
  cursor: pointer;
}

.chat-question {
  margin: 0 0 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--mahogany);
}

.chat-answer p,
.chat-answer-en p {
  margin: 0 0 0.65rem;
  color: var(--text);
  line-height: 1.65;
}

.chat-link {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: 600;
  color: var(--mahogany) !important;
  text-decoration: underline !important;
}

.chat-footer {
  padding: 0.85rem 1rem 1rem;
  border-top: 1px solid var(--gold-light);
  background: var(--wall-yellow-dark);
}

.chat-footer-note {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.chat-footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chat-action {
  display: inline-block;
  padding: 0.45rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none !important;
  border: 1px solid var(--gold-light);
}

.chat-action-call {
  background: var(--mahogany);
  color: var(--cream) !important;
}

.chat-action-call:hover {
  color: var(--saffron) !important;
}

.chat-action-map {
  background: #fff;
  color: var(--mahogany) !important;
}

.chat-action-map:hover {
  border-color: var(--gold);
}

/* Mobile */
@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: stretch;
  }

  .main-nav {
    justify-content: center;
  }

  .hero {
    min-height: 60vh;
  }

  .title-vi {
    padding: 0.4rem 1.25rem;
    font-size: 1.35rem;
  }

  .chat-widget {
    right: 0.75rem;
    bottom: 0.75rem;
  }

  .chat-toggle-label {
    display: none;
  }

  .chat-panel {
    width: min(22rem, calc(100vw - 1.5rem));
  }
}