/* ===== RESET & BASE ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* FONTS */
  --font-display: 'Anton', sans-serif;
  --font-serif: 'Cormorant Garamond', serif;
  --font-sans: 'Montserrat', sans-serif;
  /* legacy aliases */
  --font-heading: var(--font-serif);
  --font-body: var(--font-sans);

  /* COLORS */
  --bg-primary: #ffffff;
  --bg-header: #000000;
  --bg-footer: #000000;
  --bg-cream: #FFFDF9;
  --text-primary: #000000;
  --text-secondary: #6E6E6E;
  --accent: #5078B3;
  --accent-dark: #375C92;
  --accent-warm: #B4AAA0;
  --yellow: #F2BC2E;
  --cream-pink: #FFF7F4;
  --gray-light: #C2C2C2;
  --border-light: rgba(0,0,0,0.08);

  --max-width: 1200px;
  --header-height: 70px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 14px;
  font-weight: 200;
  overflow-x: hidden;
}

a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent);
}

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

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

/* ===== HEADER ===== */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-header);
  border-bottom: none;
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo img {
  height: 45px;
  width: auto;
}

.main-nav {
  display: flex;
  gap: 32px;
}

.main-nav a {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.5px;
  padding: 8px 0;
  position: relative;
  color: #FFFFFF;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: #fff;
  transition: width 0.3s ease;
}

.main-nav a:hover {
  color: rgba(255,255,255,0.7);
}

.main-nav a.active {
  color: #FFFFFF;
  font-weight: 700;
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(10px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  z-index: 999;
}

.mobile-menu.active {
  display: flex;
}

.mobile-menu a {
  font-size: 1.5rem;
  text-transform: lowercase;
  letter-spacing: 1px;
  color: var(--text-primary);
}

.mobile-menu .social-bar {
  display: flex;
  gap: 20px;
  margin-top: 20px;
}

.mobile-menu .social-bar a {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* Body padding for fixed header */
body {
  padding-top: var(--header-height);
}

/* Hero sections reset padding-top since they sit right under header */
.hero-collage {
  margin-top: calc(-1 * var(--header-height));
  padding-top: 0;
}

/* ===== SECTIONS COMMON ===== */
section {
  padding: 80px 0;
}

.section-heading {
  font-family: var(--font-heading);
  font-size: 2rem;
  text-align: center;
  margin-bottom: 48px;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-weight: 400;
}

/* ===== HERO COLLAGE (floating scattered images) ===== */
.hero-collage {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-primary);
}

.hero-collage-inner {
  position: relative;
  width: 100%;
  height: 100%;
}

.collage-img {
  position: absolute;
  box-shadow: 2px 4px 20px rgba(0,0,0,0.1);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
  overflow: hidden;
}

.collage-img:hover {
  transform: scale(1.05) !important;
  box-shadow: 4px 8px 30px rgba(0,0,0,0.2);
  z-index: 10;
}

.collage-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== ABOUT INTRO ===== */
.about-intro {
  text-align: center;
  background: var(--bg-primary);
  position: relative;
  z-index: 2;
}

.about-intro .container {
  max-width: 800px;
}

.about-intro h2 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  margin-bottom: 32px;
  font-weight: 400;
}

.about-intro p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.8;
}

/* ===== ARTWORK STRIP (Auto-marquee) ===== */
.artwork-strip {
  padding: 40px 0;
  overflow: hidden;
  position: relative;
  background: var(--bg-primary);
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 60s linear infinite;
}

.marquee-track:hover {
  animation-play-state: paused;
}

.marquee-track.dragging {
  animation-play-state: paused;
}

.marquee-track img {
  height: 180px;
  width: auto;
  margin-right: 12px;
  flex-shrink: 0;
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ===== FOUNDER SECTION (full-width hero) ===== */
.founder-section {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--bg-primary);
}

.founder-layout {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  min-height: 70vh;
  position: relative;
}

.founder-text-left {
  padding: 60px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.founder-text-left h2 {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 900;
  margin-bottom: 24px;
  letter-spacing: 2px;
}

.founder-text-left p,
.founder-text-right p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
}

.founder-photo {
  position: relative;
  overflow: hidden;
}

.founder-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.founder-name-overlay {
  position: absolute;
  bottom: 0;
  right: 0;
  padding: 30px 40px;
}

.founder-name-overlay h3 {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: 3px;
  color: var(--text-primary);
  text-shadow: 2px 2px 8px rgba(255,255,255,0.8);
}

.founder-text-right {
  padding: 60px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* ===== TESTIMONIALS (cream background) ===== */
.testimonials {
  text-align: center;
  background: var(--bg-cream);
  padding: 100px 0;
}

.testimonials .container {
  max-width: 900px;
}

.quote-mark {
  font-size: 5rem;
  line-height: 1;
  color: var(--accent);
  font-family: Georgia, serif;
}

.quote-mark.open {
  text-align: left;
}

.quote-mark.close {
  text-align: right;
}

.founder-quote {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-style: normal;
  line-height: 2.2;
  margin: 20px 0;
  color: var(--text-primary);
  white-space: pre-line;
  text-align: center;
}

.founder-info {
  margin-top: 32px;
  margin-bottom: 60px;
}

.founder-info .author-name {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.founder-info .author-role {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.testimonial-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.testimonial-card {
  background: rgba(255,255,255,0.6);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 8px;
  padding: 32px;
  text-align: left;
}

.testimonial-card .quote {
  color: var(--text-secondary);
  font-style: italic;
  line-height: 1.8;
  margin-bottom: 16px;
}

.testimonial-card .name {
  color: var(--accent);
  font-weight: 600;
}

/* ===== INSTRUCTORS ===== */
.instructors-section {
  text-align: center;
  background: var(--bg-primary);
}

.instructors-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.instructor-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  border-radius: 6px;
  aspect-ratio: 3/4;
}

.instructor-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.instructor-card:hover img {
  transform: scale(1.05);
}

.instructor-card .name-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: white;
  padding: 20px 16px;
  transform: translateY(100%);
  transition: transform 0.3s ease;
  font-family: var(--font-heading);
  font-size: 1.1rem;
}

.instructor-card:hover .name-overlay {
  transform: translateY(0);
}

.name-overlay .role {
  font-size: 0.8rem;
  color: #ccc;
  font-family: var(--font-body);
  margin-top: 4px;
}

/* ===== LATEST CLASSES ===== */
.latest-classes {
  background: var(--bg-primary);
}

.latest-classes .gallery-grid {
  column-count: 3;
}

/* ===== GALLERY GRID (used for courses, latest, sub) ===== */
.gallery-grid {
  column-count: 4;
  column-gap: 8px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.gallery-grid img {
  width: 100%;
  margin-bottom: 8px;
  border-radius: 4px;
  break-inside: avoid;
}

/* ===== COURSES PAGE ===== */
.courses-intro {
  background: #f4f1ea;
  padding: 60px 5%;
}

.courses-intro .container {
  max-width: var(--max-width);
}

.courses-intro h2 {
  font-family: var(--font-sans);
  font-size: 80px;
  font-weight: 900;
  line-height: 1.0em;
  color: #004aad;
  margin-bottom: 32px;
  text-align: left;
}

.courses-intro p {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 200;
  line-height: 1.7em;
  color: #004aad;
  margin-bottom: 14px;
  max-width: 100%;
  text-align: left;
}

.courses-intro a.nhi-dong-link {
  color: #004aad;
  text-decoration: none;
}

.courses-intro a.nhi-dong-link:hover {
  color: #003080;
  text-decoration: underline;
}

/* --- 3 Sáng tác (cream bg) --- */
.sangtac-section {
  background: var(--bg-cream);
  padding: 50px 5%;
  text-align: center;
}

.sangtac-heading {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 400;
  font-style: italic;
  line-height: 1.1em;
  margin-bottom: 20px;
  color: #000000;
}

.sangtac-subtext {
  max-width: 700px;
  margin: 0 auto 48px;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 200;
  line-height: 1.6em;
  color: var(--text-secondary);
}

.sangtac-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1000px;
  margin: 0 auto;
}

.sangtac-card {
  background: transparent;
  overflow: hidden;
  text-align: center;
  position: relative;
}

.sangtac-card-img {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  cursor: pointer;
}

.sangtac-card-img img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

/* Hover overlay — white semi-transparent with black text */
.sangtac-card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.88);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sangtac-card-overlay p {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 200;
  line-height: 1.5em;
  color: #000000;
  text-align: left;
}

.sangtac-card-img:hover .sangtac-card-overlay {
  opacity: 1;
}

.sangtac-card-img:hover img {
  transform: scale(1.05);
}

.sangtac-card-body {
  padding: 16px 8px 8px;
}

.sangtac-card-body h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 400;
  line-height: 1.2em;
  margin-bottom: 12px;
  color: var(--accent);
}

.btn-detail {
  display: inline-block;
  padding: 6px 20px;
  border: 1px solid var(--accent);
  border-radius: 20px;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 300;
  letter-spacing: 0.5px;
  cursor: pointer;
  background: transparent;
  color: var(--accent);
  transition: all 0.3s ease;
}

.btn-detail:hover {
  background: var(--accent);
  color: #FFFFFF;
}

/* --- Cảm thụ Mỹ thuật (navy bg) --- */
.camthu-section {
  padding: 0;
  overflow: hidden;
}

.camthu-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 480px;
  max-width: 1400px;
  margin: 0 auto;
}

.camthu-image {
  overflow: hidden;
  background: #0a3d8b;
}

.camthu-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.camthu-text {
  background: #0a3d8b;
  padding: 48px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.camthu-text h2 {
  font-family: var(--font-sans);
  font-size: 60px;
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1.0em;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 3px;
}

.camthu-text .subtitle {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  color: #FFFFFF;
  letter-spacing: 1px;
  margin-bottom: 20px;
}

.camthu-text p {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 200;
  font-style: italic;
  line-height: 1.6em;
  color: #FFFFFF;
  margin-bottom: 24px;
}

.camthu-text .detail-text {
  display: none;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 200;
  font-style: italic;
  line-height: 1.6em;
  color: #FFFFFF;
  margin-bottom: 24px;
}

.camthu-text .detail-text.open {
  display: block;
}

.camthu-text .btn-detail {
  border-color: #FFFFFF;
  color: #FFFFFF;
  align-self: flex-end;
}

.camthu-text .btn-detail:hover {
  background: #FFFFFF;
  color: #0a3d8b;
}

/* --- Nhi đồng (full-bleed bg image + dark overlay + left-aligned white text) --- */
.nhidong-section {
  position: relative;
  min-height: 600px;
  padding: 0;
  overflow: hidden;
}

.nhidong-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
}

.nhidong-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.nhidong-bg img:not(:first-child) {
  display: none;
}

.nhidong-overlay {
  position: relative;
  z-index: 1;
  background: rgba(0, 0, 0, 0.40);
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.nhidong-content {
  text-align: left;
  max-width: 600px;
  padding: 80px 60px;
  color: #FFFFFF;
}

.nhidong-content h2 {
  font-family: var(--font-display);
  font-size: 52px;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 3px;
  line-height: 1.1em;
  margin-bottom: 12px;
  color: #FFFFFF;
}

.nhidong-content .subtitle {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 1px;
  margin-bottom: 24px;
  color: #FFFFFF;
}

.nhidong-content p {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 200;
  font-style: italic;
  line-height: 1.6em;
  margin-bottom: 24px;
  color: #FFFFFF;
}

.nhidong-content .detail-text {
  display: none;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 200;
  font-style: italic;
  line-height: 1.6em;
  margin-bottom: 24px;
  color: #FFFFFF;
}

.nhidong-content .detail-text.open {
  display: block;
}

.nhidong-content .btn-detail {
  border-color: #FFFFFF;
  color: #FFFFFF;
}

.nhidong-content .btn-detail:hover {
  background: #FFFFFF;
  color: #000000;
}

/* --- Doanh nghiệp (beige bg, 4x3 checkerboard grid) --- */
.doanhnghiep-section {
  background: #f4f1ea;
  padding: 60px 5%;
}

.doanhnghiep-section .section-heading {
  font-family: var(--font-sans);
  font-size: 24px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-dark);
  text-align: center;
  margin-bottom: 36px;
}

.doanhnghiep-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 250px;
  gap: 0;
  max-width: var(--max-width);
  margin: 0 auto;
}

.dn-cell {
  border: 1px solid rgba(0,0,0,0.15);
  overflow: hidden;
}

.dn-cell-text {
  background: #FFFFFF;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
}

.dn-cell-text h3 {
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent-dark);
  margin-bottom: 6px;
  line-height: 1.4em;
}

.dn-cell-text p {
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 200;
  line-height: 1.5em;
  color: var(--accent-dark);
}

.dn-cell-image {
  overflow: hidden;
  height: 100%;
}

.dn-cell-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* --- Chất liệu --- */
.chatlieu-section {
  background: var(--bg-primary);
  padding: 50px 5%;
  overflow: hidden;
}

.chatlieu-layout {
  max-width: var(--max-width);
  margin: 0 auto;
}

.chatlieu-heading {
  font-family: var(--font-sans);
  font-size: 24px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #000000;
  margin-bottom: 36px;
  text-align: left;
}

.chatlieu-body {
  display: grid;
  grid-template-columns: 55fr 45fr;
  gap: 24px;
  min-height: 400px;
}

.chatlieu-image {
  overflow: hidden;
  border-radius: 4px;
}

.chatlieu-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.chatlieu-cards {
  display: flex;
  flex-direction: column;
  gap: 24px;
  justify-content: center;
}

.chatlieu-card h3 {
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #000000;
  margin-bottom: 6px;
  line-height: 1.4em;
}

.chatlieu-card p {
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 200;
  line-height: 1.5em;
  color: var(--text-secondary);
}

/* ===== EVENTS PAGE ===== */
.events-hero {
  text-align: center;
  padding-bottom: 40px;
}

.events-hero h2 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  margin-bottom: 16px;
  letter-spacing: 3px;
  font-weight: 400;
}

.events-hero p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.event-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.event-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.event-card img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

.event-card .event-info {
  padding: 20px;
}

.event-card .event-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.event-card .event-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 12px;
  line-height: 1.6;
}

.event-card .event-date {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
}

/* ===== FOOTER ===== */
#site-footer {
  background: var(--bg-footer);
  border-top: none;
  padding: 48px 5% 24px;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.footer-info h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 400;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.footer-info p {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 200;
  color: var(--gray-light);
  margin-bottom: 6px;
}

.footer-info .footer-email {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 200;
  color: var(--accent-warm);
}

.footer-info .footer-email:hover {
  color: #FFFFFF;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-nav a {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 300;
  color: var(--gray-light);
  letter-spacing: 0.5px;
}

.footer-nav a:hover {
  color: #FFFFFF;
}

.footer-social {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-social a {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--gray-light);
  font-size: 12px;
}

.footer-social a:hover {
  color: var(--accent-warm);
}

.footer-social svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.footer-map {
  display: flex;
  align-items: center;
}

.footer-map iframe {
  width: 100%;
  min-height: 280px;
  border-radius: 8px;
}

.copyright {
  grid-column: 1 / -1;
  text-align: center;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 200;
  color: var(--text-secondary);
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 20px;
}

/* ===== FADE IN ANIMATION ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .gallery-grid {
    column-count: 3;
  }

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

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

  .camthu-layout {
    grid-template-columns: 1fr;
  }

  .chatlieu-body {
    grid-template-columns: 1fr;
  }

  .doanhnghiep-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: 200px;
  }

  .footer-container {
    grid-template-columns: 1fr;
  }

  .founder-layout {
    grid-template-columns: 1fr;
  }

  .founder-text-left, .founder-text-right {
    padding: 40px 20px;
  }

  .founder-photo {
    min-height: 50vh;
  }

  .founder-name-overlay h3 {
    font-size: 2.5rem;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .gallery-grid {
    column-count: 2;
  }

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

  .latest-classes .gallery-grid {
    column-count: 2;
  }

  .sangtac-cards {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .camthu-text {
    padding: 40px 20px;
  }

  .chatlieu-body {
    grid-template-columns: 1fr;
  }

  .doanhnghiep-grid {
    grid-template-columns: 1fr;
  }

  .sangtac-heading {
    font-size: 24px;
  }

  .camthu-text h2 {
    font-size: 36px;
  }

  .nhidong-content h2 {
    font-size: 36px;
  }

  .nhidong-content {
    padding: 40px 20px;
  }

  .chatlieu-heading {
    font-size: 18px;
  }

  /* Show overlay text on mobile (no hover) */
  .sangtac-card-overlay {
    position: static;
    opacity: 1;
    background: transparent;
    padding: 8px 0 0;
  }

  .sangtac-card-overlay p {
    color: var(--text-secondary);
    font-size: 11px;
    text-align: center;
  }

  .events-grid {
    grid-template-columns: 1fr;
  }

  .footer-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-left {
    align-items: center;
  }

  .footer-nav, .footer-social {
    align-items: center;
    justify-content: center;
  }

  .footer-map iframe {
    min-height: 220px;
  }

  section {
    padding: 50px 0;
  }

  .about-intro h2,
  .events-hero h2 {
    font-size: 1.8rem;
  }

  .courses-intro h2 {
    font-size: 32px;
  }

  .founder-quote {
    font-size: 1.2rem;
  }

  .marquee-track img {
    height: 120px;
  }

  .instructor-card .name-overlay {
    transform: translateY(0);
  }

  .hero-collage {
    height: 60vh;
  }

  .collage-img {
    transform: rotate(0deg) !important;
  }

  .founder-text-left h2 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .gallery-grid {
    column-count: 1;
  }

  .instructors-grid {
    grid-template-columns: 1fr 1fr;
  }

  .course-cards-grid {
    grid-template-columns: 1fr;
  }

  .header-container {
    padding: 0 12px;
  }

  .logo img {
    height: 36px;
  }

  .hero-collage {
    height: 50vh;
  }
}