/* ======================================================
   TRUNG TÂM GIA SƯ HIẾU KIỆT — STYLE.CSS
   Color Palette:
     Navy:   #061B3A
     Gold:   #D4AF58
     White:  #FFFFFF
     Light:  #F6F8FC
   ====================================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Be Vietnam Pro', 'Inter', sans-serif;
  color: #1a2b4a;
  background: #ffffff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: inherit; }

/* ---- CSS VARIABLES ---- */
:root {
  --navy:        #061B3A;
  --navy-mid:    #0d2b5e;
  --navy-light:  #1a3a6e;
  --gold:        #D4AF58;
  --gold-dark:   #b8952e;
  --gold-light:  #e8c97a;
  --white:       #FFFFFF;
  --light:       #F6F8FC;
  --text-body:   #2d3e5a;
  --text-muted:  #6b7a99;
  --border:      #e2e8f0;
  --shadow-sm:   0 2px 8px rgba(6,27,58,0.06);
  --shadow-md:   0 4px 20px rgba(6,27,58,0.10);
  --shadow-lg:   0 8px 40px rgba(6,27,58,0.14);
  --radius-sm:   8px;
  --radius-md:   14px;
  --radius-lg:   20px;
  --radius-xl:   28px;
  --transition:  0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --header-h:    80px;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'Be Vietnam Pro', 'Inter', sans-serif;
}

/* ---- CONTAINER ---- */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- SECTION PADDING ---- */
.section-pad { padding: 80px 0; }
@media (max-width: 768px) { .section-pad { padding: 56px 0; } }

/* ---- BACKGROUNDS ---- */
.bg-light  { background: var(--light); }
.bg-navy   { background: var(--navy); }

/* ---- TYPOGRAPHY ---- */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3vw, 2.3rem);
  font-weight: 800;
  color: var(--navy);
  line-height: 1.2;
  letter-spacing: 0.3px;
  text-align: center;
}
.section-title.text-white { color: #ffffff; }

.section-sub {
  font-size: 1rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 12px;
}
.section-sub.text-white-70 { color: rgba(255,255,255,0.72); }

.section-header { margin-bottom: 52px; }

.highlight-gold { color: var(--gold); }
.link-gold { color: var(--gold); font-weight: 600; }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.3px;
  transition: all var(--transition);
  border: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}

.btn-gold {
  background: var(--gold);
  color: var(--navy);
  border-color: var(--gold);
}
.btn-gold:hover {
  background: var(--gold-dark);
  border-color: var(--gold-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(212,175,88,0.35);
}

.btn-outline-navy {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}
.btn-outline-navy:hover {
  background: var(--navy);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-navy {
  background: var(--navy);
  color: #ffffff;
  border-color: var(--navy);
}
.btn-navy:hover {
  background: var(--navy-mid);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-full { width: 100%; }
.w-full { width: 100%; }

/* ---- SCROLL ANIMATIONS ---- */
[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}
[data-delay="50"]  { transition-delay: 0.05s; }
[data-delay="100"] { transition-delay: 0.10s; }
[data-delay="150"] { transition-delay: 0.15s; }
[data-delay="200"] { transition-delay: 0.20s; }
[data-delay="300"] { transition-delay: 0.30s; }

/* ======================================================
   HEADER
   ====================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow-md); }

.header-inner {
  display: flex;
  align-items: center;
  height: var(--header-h);
  gap: 20px;
}

.header-logo { flex-shrink: 0; }
.logo-img {
  height: 60px;
  width: auto;
  object-fit: contain;
}

.main-nav { margin-left: auto; }
.nav-list {
  display: flex;
  gap: 4px;
}
.nav-link {
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-body);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
  color: var(--navy);
  background: var(--light);
}

.header-cta {
  margin-left: 12px;
  padding: 10px 22px;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  margin-left: auto;
}
.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: all var(--transition);
}

/* Mobile overlay */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1100;
  background: rgba(6,27,58,0.5);
  backdrop-filter: blur(4px);
}
.mobile-overlay.open { display: block; }

.mobile-nav-content {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  background: #ffffff;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: slideInRight 0.3s ease;
}
@keyframes slideInRight {
  from { transform: translateX(100%); }
  to   { transform: translateX(0); }
}
.mobile-close {
  align-self: flex-end;
  background: var(--light);
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 12px;
}
.mobile-nav-list { flex: 1; }
.mobile-nav-list li { border-bottom: 1px solid var(--border); }
.mobile-nav-link {
  display: block;
  padding: 14px 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
}
.mobile-nav-cta { padding-top: 16px; }

/* ======================================================
   HERO SECTION
   ====================================================== */
.hero-section {
  padding-top: calc(var(--header-h) + 60px);
  padding-bottom: 60px;
  background: linear-gradient(135deg, #f8fafd 0%, #eef2fb 100%);
  position: relative;
  overflow: hidden;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-math-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.math-symbol {
  position: absolute;
  font-family: 'Georgia', serif;
  color: rgba(6,27,58,0.055);
  font-weight: 700;
  user-select: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--gold-dark);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.12;
  color: var(--navy);
  margin-bottom: 24px;
  letter-spacing: -0.3px;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.75;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 24px;
}

.hero-channels {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}
.channel-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--gold);
  border-radius: 50%;
  flex-shrink: 0;
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%       { transform: scale(1.4); opacity: 0.7; }
}

.hero-image {
  position: relative;
}
.hero-img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  object-fit: cover;
  aspect-ratio: 4/3;
}

/* ======================================================
   QUICK INFO SECTION
   ====================================================== */
.quick-info {
  background: #ffffff;
  padding: 0;
  margin-top: -28px;
  position: relative;
  z-index: 10;
}

.quick-info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: #ffffff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}

.quick-card {
  padding: 28px 24px;
  text-align: center;
  border-right: 1px solid var(--border);
  transition: background var(--transition), transform var(--transition);
}
.quick-card:last-child { border-right: none; }
.quick-card:hover { background: var(--light); }

.quick-icon {
  display: flex;
  justify-content: center;
  margin-bottom: 14px;
}

.quick-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 6px;
}

.quick-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ======================================================
   ABOUT SECTION
   ====================================================== */
.about-section { background: #ffffff; }

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.about-desc {
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 18px;
}

.pillar-card {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px;
  background: var(--light);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  border-left: 4px solid var(--gold);
  transition: transform var(--transition), box-shadow var(--transition);
}
.pillar-card:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.pillar-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--gold);
  line-height: 1;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.pillar-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 6px;
}
.pillar-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ======================================================
   PROGRAMS SECTION
   ====================================================== */
.programs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.program-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 32px 28px;
  border: 2px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.program-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--navy);
}

.program-card--featured {
  border-color: var(--gold);
  box-shadow: 0 4px 24px rgba(212,175,88,0.15);
  position: relative;
}
.program-card--featured:hover {
  box-shadow: 0 8px 40px rgba(212,175,88,0.25);
  border-color: var(--gold);
}

.program-card-header {
  margin-bottom: 24px;
  position: relative;
}

.program-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  background: var(--light);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 10px;
  text-transform: uppercase;
}
.program-badge--gold {
  background: rgba(212,175,88,0.15);
  color: var(--gold-dark);
}

.program-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--navy);
}

.popular-tag {
  position: absolute;
  top: -8px;
  right: 0;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  background: var(--gold);
  color: var(--navy);
  padding: 3px 10px;
  border-radius: 20px;
}

.program-features {
  flex: 1;
  margin-bottom: 28px;
}
.program-features li {
  padding: 8px 0;
  font-size: 0.92rem;
  color: var(--text-body);
  border-bottom: 1px solid var(--border);
  padding-left: 20px;
  position: relative;
}
.program-features li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--gold);
  font-size: 0.85rem;
}
.program-features li:last-child { border-bottom: none; }

.program-cta { margin-top: auto; }

/* ======================================================
   METHOD SECTION (TIMELINE)
   ====================================================== */
.method-section .section-title { text-align: center; }

.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
  margin-top: 16px;
}

.timeline-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 20px;
  position: relative;
}

.timeline-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 24px;
  width: 100%;
}

.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(212,175,88,0.15);
  border: 2px solid var(--gold);
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--gold);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.step-connector {
  position: absolute;
  top: 32px;
  left: calc(50% + 32px);
  right: calc(-50% + 32px);
  height: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(212,175,88,0.3));
}
.timeline-item:last-child .step-connector { display: none; }

.step-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 10px;
}
.step-desc {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.70);
  line-height: 1.6;
}

/* ======================================================
   ROADMAP / LESSON SECTION
   ====================================================== */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.lesson-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 28px 24px;
  border: 1px solid var(--border);
  text-align: center;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}
.lesson-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.lesson-num {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--navy), var(--navy-mid));
  color: var(--gold);
  font-size: 1.4rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.lesson-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
}
.lesson-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ======================================================
   TARGET AUDIENCE SECTION
   ====================================================== */
.target-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.target-text .section-title { text-align: left; margin-bottom: 28px; }

.checklist { display: flex; flex-direction: column; gap: 14px; }

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: 1rem;
  color: var(--text-body);
  line-height: 1.6;
}
.check-icon {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--gold);
  color: var(--navy);
  font-size: 0.75rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

/* Target Visual */
.target-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.target-graphic {
  width: 320px;
  height: 320px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tg-circle {
  position: absolute;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Georgia', serif;
  font-weight: 700;
  animation: float 4s ease-in-out infinite;
}
.tg-circle--1 {
  width: 110px; height: 110px;
  background: rgba(6,27,58,0.07);
  border: 1.5px solid rgba(212,175,88,0.3);
  top: 20px; left: 10px;
  animation-delay: 0s;
}
.tg-circle--2 {
  width: 100px; height: 100px;
  background: rgba(212,175,88,0.08);
  border: 1.5px solid rgba(6,27,58,0.2);
  bottom: 30px; left: 30px;
  animation-delay: 1.5s;
}
.tg-circle--3 {
  width: 95px; height: 95px;
  background: rgba(6,27,58,0.06);
  border: 1.5px solid rgba(212,175,88,0.25);
  top: 40px; right: 10px;
  animation-delay: 0.8s;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}

.tg-math {
  font-size: 0.8rem;
  color: var(--navy);
  opacity: 0.6;
  text-align: center;
}

.tg-center {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--navy), var(--navy-mid));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 32px rgba(6,27,58,0.25);
  position: relative;
  z-index: 2;
}
.tg-icon { font-size: 1.8rem; margin-bottom: 4px; }
.tg-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--gold);
  text-align: center;
  line-height: 1.3;
}

/* ======================================================
   CTA BANNER
   ====================================================== */
.cta-banner {
  background: linear-gradient(135deg, var(--gold) 0%, #c9a03d 100%);
  padding: 60px 0;
}
.cta-banner-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.cta-banner-title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: 12px;
}
.cta-banner-desc {
  font-size: 1rem;
  color: rgba(6,27,58,0.75);
  max-width: 500px;
}
.cta-banner-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

/* ======================================================
   TESTIMONIALS SECTION
   ====================================================== */
.testimonials-carousel {
  position: relative;
  overflow: hidden;
}

.testimonials-track {
  display: flex;
  transition: transform 0.45s cubic-bezier(0.4,0,0.2,1);
}

.testimonial-card {
  flex: 0 0 100%;
  display: flex;
  gap: 24px;
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 36px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  align-items: flex-start;
}

.avatar-placeholder {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}

.testimonial-body { flex: 1; }

.stars {
  font-size: 1.1rem;
  color: var(--gold);
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.placeholder-text {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  font-style: italic;
  margin-bottom: 12px;
}
.placeholder-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
}

.carousel-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 28px;
}
.carousel-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--navy);
  background: #ffffff;
  color: var(--navy);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.carousel-btn:hover {
  background: var(--navy);
  color: #ffffff;
}
.carousel-dots {
  display: flex;
  gap: 8px;
}
.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.carousel-dot.active {
  background: var(--navy);
  transform: scale(1.3);
}

/* ======================================================
   FAQ SECTION
   ====================================================== */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}
.faq-item:first-child { border-top: 1px solid var(--border); }

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: color var(--transition);
}
.faq-question:hover { color: var(--gold-dark); }

.faq-icon {
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--gold);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.35s ease;
  overflow: hidden;
}
.faq-answer.open {
  grid-template-rows: 1fr;
}
.faq-answer-inner {
  overflow: hidden;
  min-height: 0;
}
.faq-answer-inner p {
  padding-bottom: 20px;
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.75;
}

/* ======================================================
   CONTACT SECTION
   ====================================================== */
.contact-channels {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 56px;
}

.channel-card {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  transition: background var(--transition), transform var(--transition);
}
.channel-card:hover {
  background: rgba(255,255,255,0.12);
  transform: translateY(-4px);
}

.channel-icon-wrap {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(212,175,88,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 4px;
}

.channel-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: #ffffff;
}
.channel-desc {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.5;
}
.phone-display {
  color: var(--gold);
  font-size: 1.1rem;
}
.channel-btn { margin-top: 8px; }

/* Form section */
.form-section {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-lg);
  padding: 44px;
}

.form-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  text-align: center;
  margin-bottom: 32px;
  letter-spacing: 0.3px;
}

.register-form { display: flex; flex-direction: column; gap: 20px; }

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

.form-group { display: flex; flex-direction: column; gap: 8px; }

.form-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: rgba(255,255,255,0.85);
}

.form-input {
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.07);
  color: #ffffff;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition), background var(--transition);
  width: 100%;
}
.form-input::placeholder { color: rgba(255,255,255,0.35); }
.form-input:focus {
  outline: none;
  border-color: var(--gold);
  background: rgba(255,255,255,0.10);
}
.form-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23D4AF58' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
  cursor: pointer;
}
.form-select option { background: var(--navy); color: #ffffff; }

.form-textarea { resize: vertical; min-height: 100px; }

.form-submit {
  font-size: 1rem;
  padding: 15px;
  letter-spacing: 0.5px;
}

.form-success {
  text-align: center;
  padding: 40px;
}
.success-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--gold);
  color: var(--navy);
  font-size: 1.8rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.form-success p {
  color: rgba(255,255,255,0.85);
  font-size: 1rem;
  line-height: 1.7;
}

/* ======================================================
   FOOTER
   ====================================================== */
.site-footer {
  background: var(--navy);
  color: rgba(255,255,255,0.75);
  padding: 60px 0 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
  height: 72px;
  width: auto;
  object-fit: contain;
  margin-bottom: 16px;
}
.footer-name {
  font-size: 0.95rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 4px;
  letter-spacing: 0.5px;
}
.footer-tagline {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.55);
  margin-bottom: 12px;
}
.footer-phone { font-size: 0.9rem; margin-bottom: 20px; }
.footer-phone-link {
  color: var(--gold);
  font-weight: 700;
  font-size: 1rem;
}
.footer-phone-link:hover { color: var(--gold-light); }

.footer-socials {
  display: flex;
  gap: 10px;
}
.social-link {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.65);
  transition: all var(--transition);
}
.social-link:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--navy);
}
.social-link--coming-soon {
  opacity: 0.4;
  cursor: default;
  position: relative;
}
.social-link--coming-soon:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.65);
  opacity: 0.7;
}

.footer-nav-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 20px;
}
.footer-nav-list { display: flex; flex-direction: column; gap: 10px; }
.footer-nav-link {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
}
.footer-nav-link:hover { color: var(--gold); }

.footer-contact-list { display: flex; flex-direction: column; gap: 12px; }
.footer-contact-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
}
.footer-contact-link:hover { color: var(--gold); }

.footer-bottom {
  padding: 20px 24px;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

/* ======================================================
   FLOATING CONTACT BUTTONS (DESKTOP)
   ====================================================== */
.floating-contacts {
  position: fixed;
  right: 24px;
  bottom: 80px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  z-index: 900;
}

.float-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 28px;
  color: #ffffff;
  font-weight: 600;
  font-size: 0.82rem;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
  white-space: nowrap;
}
.float-btn:hover { transform: translateX(-4px) scale(1.04); box-shadow: var(--shadow-lg); }

.float-fb   { background: #1877f2; }
.float-zalo { background: #0068ff; }
.float-phone {
  background: var(--navy);
  border: 2px solid var(--gold);
  padding-right: 20px;
}

.float-phone-label {
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--gold);
}

/* Pulse animation */
@keyframes pulse-ring {
  0%   { box-shadow: 0 0 0 0 rgba(212,175,88,0.5); }
  70%  { box-shadow: 0 0 0 14px rgba(212,175,88,0); }
  100% { box-shadow: 0 0 0 0 rgba(212,175,88,0); }
}
.pulse { animation: pulse-ring 2.5s infinite; }

/* ======================================================
   MOBILE STICKY BAR
   ====================================================== */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 950;
  background: #ffffff;
  border-top: 1px solid var(--border);
  box-shadow: 0 -4px 20px rgba(6,27,58,0.12);
}

.mobile-sticky-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 10px 8px;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-body);
  border-right: 1px solid var(--border);
  transition: background var(--transition);
}
.mobile-sticky-btn:last-child { border-right: none; }
.mobile-sticky-btn:hover { background: var(--light); }

.mobile-sticky-btn--primary {
  background: var(--gold);
  color: var(--navy);
}
.mobile-sticky-btn--primary:hover { background: var(--gold-dark); }

/* ======================================================
   RESPONSIVE — TABLET (max-width: 992px)
   ====================================================== */
@media (max-width: 992px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-section { min-height: auto; padding-top: calc(var(--header-h) + 40px); padding-bottom: 40px; }
  .hero-headline { font-size: 2.2rem; }
  .hero-image { max-width: 560px; margin: 0 auto; width: 100%; }

  .quick-info-grid { grid-template-columns: repeat(2, 1fr); }
  .quick-card { border-right: none; border-bottom: 1px solid var(--border); }
  .quick-card:nth-child(odd) { border-right: 1px solid var(--border); }
  .quick-card:nth-child(3),
  .quick-card:nth-child(4) { border-bottom: none; }

  .about-inner { grid-template-columns: 1fr; gap: 36px; }

  .programs-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }

  .timeline { grid-template-columns: 1fr; gap: 28px; }
  .timeline-item { flex-direction: row; text-align: left; }
  .timeline-step { width: auto; flex-direction: column; align-items: center; margin-bottom: 0; margin-right: 24px; flex-shrink: 0; }
  .step-connector {
    position: static;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--gold), rgba(212,175,88,0.2));
    margin: 0 auto;
    flex: 1;
    min-height: 40px;
  }
  .timeline-body { padding-top: 4px; }

  .lesson-grid { grid-template-columns: repeat(2, 1fr); }
  .target-inner { grid-template-columns: 1fr; }
  .target-visual { display: none; }

  .contact-channels { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto 40px; }

  .form-row { grid-template-columns: 1fr; }

  .footer-inner { grid-template-columns: 1fr 1fr; gap: 36px; }
  .footer-brand { grid-column: 1 / -1; }

  .main-nav { display: none; }
  .header-cta { display: none; }
  .hamburger { display: flex; }
}

/* ======================================================
   RESPONSIVE — MOBILE (max-width: 640px)
   ====================================================== */
@media (max-width: 640px) {
  :root { --header-h: 64px; }

  .hero-headline { font-size: 1.8rem; }
  .hero-sub { font-size: 0.95rem; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .br-desktop { display: none; }

  .math-symbol { display: none; }

  .quick-info-grid { grid-template-columns: 1fr; }
  .quick-card { border-right: none !important; border-bottom: 1px solid var(--border); }
  .quick-card:last-child { border-bottom: none; }

  .section-title { font-size: 1.4rem; }

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

  .cta-banner-inner { flex-direction: column; text-align: center; }
  .cta-banner-actions { justify-content: center; width: 100%; }
  .cta-banner-actions .btn { flex: 1; min-width: 140px; }

  .testimonial-card { flex-direction: column; padding: 24px; }

  .form-section { padding: 24px 20px; }

  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-brand { grid-column: auto; }

  /* Show mobile sticky bar on mobile */
  .mobile-sticky-bar { display: flex; }

  /* Hide desktop floating buttons on mobile */
  .floating-contacts { display: none; }

  /* Add bottom padding for sticky bar */
  body { padding-bottom: 68px; }

  .target-text .section-title { font-size: 1.3rem; }
}

/* ======================================================
   PRINT STYLES
   ====================================================== */
@media print {
  .site-header, .floating-contacts, .mobile-sticky-bar,
  .hero-actions, .cta-banner, .contact-channels { display: none; }
}

/* ======================================================
   TEAM SECTION
   ====================================================== */
.team-section { background: var(--light); }

/* --- Group label --- */
.team-group-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--gold-dark);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.team-group-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--gold-light), transparent);
}
.team-group-label--ta {
  margin-top: 52px;
}

/* --- Lead grid (2 columns) --- */
.team-lead-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

/* --- TA grid (5 columns) --- */
.team-ta-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

/* --- Base card --- */
.team-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
}
.team-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

/* --- Lead card --- */
.team-card--lead {
  display: flex;
  align-items: flex-start;
  gap: 28px;
  padding: 32px;
}

/* --- TA card --- */
.team-card--ta {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 28px 20px 24px;
}

/* --- Avatar wrap (for lead — holds avatar + badge) --- */
.team-avatar-wrap {
  position: relative;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

/* --- Avatar circles --- */
.team-avatar {
  border-radius: 50%;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
}
.team-avatar--lead {
  width: 100px;
  height: 100px;
  box-shadow: 0 4px 20px rgba(6,27,58,0.25);
  border: 3px solid var(--gold);
}
.team-avatar--ta {
  width: 72px;
  height: 72px;
  margin-bottom: 14px;
  border: 2px solid var(--gold-light);
  box-shadow: 0 3px 12px rgba(6,27,58,0.15);
}

/* --- Initials text --- */
.team-initials {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 1px;
  font-size: 1.5rem;
  line-height: 1;
}
.team-initials--sm {
  font-size: 1.1rem;
}

/* --- Role badge (lead cards) --- */
.team-badge {
  background: var(--gold);
  color: var(--navy);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 20px;
  white-space: nowrap;
}

/* --- Info block --- */
.team-info { flex: 1; }

.team-name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 4px;
  line-height: 1.3;
}
.team-name--sm {
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.team-role {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gold-dark);
  margin-bottom: 10px;
}
.team-role--sm {
  font-size: 0.78rem;
  margin-bottom: 8px;
}

.team-bio {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  font-style: italic;
}
.team-bio--sm {
  font-size: 0.78rem;
  margin-bottom: 0;
}

/* --- Tags (lead cards) --- */
.team-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.team-tag {
  background: var(--light);
  border: 1px solid var(--border);
  color: var(--navy);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.3px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .team-ta-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 768px) {
  .team-lead-grid {
    grid-template-columns: 1fr;
  }
  .team-card--lead {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 28px 20px;
  }
  .team-tags {
    justify-content: center;
  }
  .team-ta-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 480px) {
  .team-ta-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  .team-card--ta {
    padding: 20px 14px;
  }
}

/* ======================================================
   GOOGLE FORM SECTION
   ====================================================== */
.gform-section {
  background: var(--light);
}
.gform-wrapper {
  max-width: 800px;
  margin: 0 auto;
}
.gform-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: 24px;
}
.gform-card iframe {
  display: block;
  width: 100%;
}
.gform-note {
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-muted);
}