:root {
  --primary-green: #006738;
  --primary-green-hover: #004d2a;
  --primary-green-light: #e6f3ed;
  --accent-pink: #e31c79;
  --accent-pink-hover: #c71465;
  --accent-pink-light: #fdeef5;
  --accent-orange: #f5a623;
  --accent-orange-hover: #d98e16;
  --text-dark: #1a1e21;
  --text-muted: #5e6b73;
  --bg-white: #ffffff;
  --bg-light: #f4f7f5;
  --bg-card: #f8faf9;
  --border-color: #e2e8e4;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: 'Montserrat', 'Sora', sans-serif;
  --container-width: 1200px;
}

/* ==========================================================================
   RESET & BASIC STYLES
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-white);
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
}

/* Utilities */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.text-center { text-align: center; }
.text-pink { color: var(--accent-pink); }
.text-green { color: var(--primary-green); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: var(--shadow-sm);
}

.btn-green {
  background-color: var(--primary-green);
  color: var(--bg-white);
}

.btn-green:hover {
  background-color: var(--primary-green-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 103, 56, 0.25);
}

.btn-pink {
  background-color: var(--accent-pink);
  color: var(--bg-white);
}

.btn-pink:hover {
  background-color: var(--accent-pink-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(227, 28, 121, 0.25);
}

.section-padding {
  padding: 80px 0;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-green);
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto 50px;
  font-weight: 400;
}

/* ==========================================================================
   HEADER SECTION
   ========================================================================== */
.main-header {
  background-color: var(--bg-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--primary-green);
}

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

.main-nav ul {
  display: flex;
  gap: 30px;
}

.main-nav a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-dark);
}

.main-nav a:hover, .main-nav a.active {
  color: var(--primary-green);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.btn-nav-study {
  background-color: var(--accent-orange);
  color: var(--bg-white);
  padding: 10px 20px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.85rem;
  box-shadow: none;
}

.btn-nav-study:hover {
  background-color: var(--accent-orange-hover);
  transform: translateY(-1px);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  background: none;
}

.nav-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--primary-green);
  border-radius: 3px;
  transition: var(--transition);
}

/* ==========================================================================
   HERO BANNER SECTION (Bố cục chéo góc hồng đặc trưng)
   ========================================================================== */
.hero-section {
  position: relative;
  background-color: var(--bg-light);
  overflow: hidden;
  padding: 60px 0 100px;
}

/* Dải chéo màu hồng hai bên đặc trưng */
.hero-section::before, .hero-section::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 15%;
  background-color: var(--accent-pink);
  transform: skewX(-15deg);
  z-index: 1;
  opacity: 0.95;
}

.hero-section::before {
  left: -8%;
}

.hero-section::after {
  right: -8%;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-content {
  padding-right: 20px;
}

.hero-badge {
  display: inline-block;
  background-color: var(--primary-green);
  color: var(--bg-white);
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hero-title {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--primary-green);
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 30px;
  font-weight: 400;
}

.hero-image-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-image-wrapper img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-height: 480px;
  object-fit: cover;
  border: 6px solid var(--bg-white);
}

/* Form đăng ký đè trên banner */
.register-form-container {
  background-color: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 30px;
  position: relative;
  z-index: 10;
  margin-top: -50px;
  border: 1px solid var(--border-color);
}

.register-form-container h3 {
  font-size: 1.3rem;
  color: var(--primary-green);
  font-weight: 800;
  margin-bottom: 20px;
  text-align: center;
}

.register-form {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}

.form-group {
  position: relative;
}

.form-group input, .form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background-color: var(--bg-white);
  color: var(--text-dark);
  transition: var(--transition);
}

.form-group input:focus, .form-group select:focus {
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(0, 103, 56, 0.1);
}

.form-terms {
  grid-column: span 2;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
  display: flex;
  align-items: center;
}

.form-submit-btn-wrapper {
  grid-column: span 1;
  text-align: right;
}

.form-submit-btn-wrapper .btn {
  width: 100%;
  padding: 12px;
  font-size: 0.9rem;
}

/* Promo Badges (2 banner nhỏ nằm ngang ở dưới) */
.promo-section {
  padding: 30px 0;
  background-color: var(--bg-white);
}

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

.promo-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 30px;
  border-radius: var(--radius-md);
  color: var(--bg-white);
  font-weight: 700;
  transition: var(--transition);
}

.promo-card:hover {
  transform: translateY(-3px);
}

.promo-card-pink {
  background: linear-gradient(135deg, var(--accent-pink), #ff4897);
  box-shadow: 0 8px 20px rgba(227, 28, 121, 0.2);
}

.promo-card-green {
  background: linear-gradient(135deg, var(--primary-green), #009650);
  box-shadow: 0 8px 20px rgba(0, 103, 56, 0.2);
}

.promo-icon {
  font-size: 2.5rem;
  flex-shrink: 0;
}

.promo-text h4 {
  font-size: 1.15rem;
  margin-bottom: 5px;
}

.promo-text p {
  font-size: 0.85rem;
  opacity: 0.9;
  font-weight: 400;
}

/* ==========================================================================
   VIDEO SHOWCASE
   ========================================================================== */
.video-section {
  background-color: var(--bg-light);
  text-align: center;
}

.video-wrapper {
  max-width: 800px;
  margin: 0 auto;
  aspect-ratio: 16/9;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 5px solid var(--bg-white);
  background-color: #000;
}

.video-wrapper iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* ==========================================================================
   PROBLEMS (Nỗi đau của phụ huynh)
   ========================================================================== */
.problems-section {
  background-color: var(--bg-white);
}

.problems-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin-bottom: 50px;
}

.problem-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 30px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.problem-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
  background-color: var(--accent-pink);
}

.problem-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(227, 28, 121, 0.2);
}

.problem-header {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 15px;
}

.problem-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--accent-pink-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-pink);
  font-weight: bold;
}

.problem-header h3 {
  font-size: 1.15rem;
  color: var(--text-dark);
  font-weight: 700;
}

.problem-body p {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 15px;
}

.problem-scenario {
  background-color: var(--bg-white);
  padding: 15px;
  border-radius: var(--radius-sm);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--text-dark);
  border-left: 3px dashed var(--accent-pink);
}

.problem-scenario strong {
  display: block;
  margin-bottom: 5px;
  color: var(--accent-pink);
}

.cta-block {
  text-align: center;
  margin-top: 50px;
}

/* ==========================================================================
   EPIPHANY (Tập - Sự thật đằng sau)
   ========================================================================== */
.epiphany-section {
  background-color: var(--bg-light);
}

.epiphany-box {
  background-color: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 50px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  max-width: 1000px;
  margin: 0 auto;
}

.epiphany-header {
  text-align: center;
  margin-bottom: 40px;
}

.epiphany-badge {
  background-color: var(--accent-pink-light);
  color: var(--accent-pink);
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  text-transform: uppercase;
  margin-bottom: 15px;
  display: inline-block;
}

.epiphany-header h3 {
  font-size: 1.8rem;
  color: var(--primary-green);
  font-weight: 800;
}

.epiphany-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.compare-card {
  padding: 30px;
  border-radius: var(--radius-md);
  position: relative;
}

.compare-card-wrong {
  background-color: #fdf2f2;
  border: 1.5px solid #fbd5d5;
}

.compare-card-right {
  background-color: #f3faf7;
  border: 1.5px solid #def7ec;
}

.compare-card h4 {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.compare-card-wrong h4 { color: #c81e1e; }
.compare-card-right h4 { color: var(--primary-green); }

.compare-card ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.compare-card li {
  font-size: 0.95rem;
  padding-left: 20px;
  position: relative;
}

.compare-card-wrong li::before {
  content: '❌';
  position: absolute;
  left: 0;
  top: 1px;
  font-size: 0.8rem;
}

.compare-card-right li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  font-weight: bold;
  color: var(--primary-green);
}

.epiphany-conclusion {
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-dark);
  font-weight: 600;
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.5;
}

/* ==========================================================================
   SOLUTION (Trụ cột đạo - Hình tròn hoạt họa)
   ========================================================================== */
.solution-section {
  background-color: var(--bg-white);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
  margin-bottom: 50px;
}

.solution-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 30px 20px;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.solution-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(0, 103, 56, 0.2);
}

.solution-circle-icon {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background-color: var(--primary-green-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary-green);
  box-shadow: 0 4px 10px rgba(0, 103, 56, 0.05);
}

.solution-circle-icon svg {
  width: 45px;
  height: 45px;
}

.solution-card h3 {
  font-size: 1.05rem;
  color: var(--primary-green);
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.4;
}

.solution-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Solution Desc Box (Khung xám nhạt bo góc như ảnh 2) */
.solution-desc-box {
  background-color: var(--bg-light);
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-dark);
  max-width: 900px;
  margin: 0 auto 40px;
  border: 1px dashed var(--primary-green);
}

/* ==========================================================================
   ROADMAP & STEPS (Bản 3 bước & Lộ trình như ảnh 2)
   ========================================================================== */
.roadmap-section {
  background-color: var(--bg-light);
}

.roadmap-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 50px;
  align-items: flex-start;
}

.roadmap-steps h3, .roadmap-table-wrapper h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-green);
  margin-bottom: 30px;
  text-transform: uppercase;
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.step-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-num {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--accent-pink);
  color: var(--bg-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  flex-shrink: 0;
  box-shadow: 0 4px 10px rgba(227, 28, 121, 0.2);
}

.step-content h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 6px;
}

.step-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Roadmap Table (Bảng màu hồng đặc trưng của LLA) */
.roadmap-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.roadmap-table th {
  background-color: var(--accent-pink);
  color: var(--bg-white);
  text-align: left;
  padding: 14px 16px;
  font-weight: 700;
  font-size: 0.9rem;
}

.roadmap-table td {
  padding: 14px 16px;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--accent-pink-light);
  font-size: 0.85rem;
}

.roadmap-table tr:last-child td {
  border-bottom: none;
}

.roadmap-table tr:nth-child(even) td {
  background-color: var(--accent-pink-light);
}

.roadmap-table .month-col {
  font-weight: 700;
  color: var(--accent-pink);
}

/* ==========================================================================
   PROGRAMS LIST (Các chương trình học khác - Các thẻ card như ảnh 2)
   ========================================================================== */
.programs-section {
  background-color: var(--bg-white);
}

.programs-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 15px;
}

.program-card-item {
  background-color: var(--primary-green);
  border-radius: var(--radius-md);
  padding: 30px 15px 20px;
  text-align: center;
  color: var(--bg-white);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 250px;
  transition: var(--transition);
}

.program-card-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.program-card-item h4 {
  font-size: 0.95rem;
  font-weight: 800;
  line-height: 1.4;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.program-badge-btn {
  color: var(--bg-white);
  font-size: 0.85rem;
  font-weight: 800;
  padding: 10px 22px;
  border-radius: 50px;
  display: inline-block;
  text-transform: uppercase;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.5px;
}

/* Màu sắc 5 nút "Tìm hiểu" theo thứ tự trong ảnh mẫu */

/* Nút 1: Vàng */
.programs-grid .program-card-item:nth-child(1) .program-badge-btn {
  background-color: #F5C518;
  color: #333;
}
.programs-grid .program-card-item:nth-child(1) .program-badge-btn:hover {
  background-color: #d9ae0d;
  transform: scale(1.05);
}

/* Nút 2: Hồng đậm */
.programs-grid .program-card-item:nth-child(2) .program-badge-btn {
  background-color: #E91E8C;
}
.programs-grid .program-card-item:nth-child(2) .program-badge-btn:hover {
  background-color: #c71475;
  transform: scale(1.05);
}

/* Nút 3: Cam đỏ */
.programs-grid .program-card-item:nth-child(3) .program-badge-btn {
  background-color: #F44C1C;
}
.programs-grid .program-card-item:nth-child(3) .program-badge-btn:hover {
  background-color: #d43a0e;
  transform: scale(1.05);
}

/* Nút 4: Đỏ */
.programs-grid .program-card-item:nth-child(4) .program-badge-btn {
  background-color: #D32F2F;
}
.programs-grid .program-card-item:nth-child(4) .program-badge-btn:hover {
  background-color: #b71c1c;
  transform: scale(1.05);
}

/* Nút 5: Xanh dương */
.programs-grid .program-card-item:nth-child(5) .program-badge-btn {
  background-color: #1E88E5;
}
.programs-grid .program-card-item:nth-child(5) .program-badge-btn:hover {
  background-color: #1565c0;
  transform: scale(1.05);
}

/* Màu nền card giống ảnh mẫu - tất cả xanh lá */
.programs-grid .program-card-item:nth-child(2) { background-color: #1aab5f; }
.programs-grid .program-card-item:nth-child(3) { background-color: #1aab5f; }
.programs-grid .program-card-item:nth-child(4) { background-color: #1aab5f; }
.programs-grid .program-card-item:nth-child(5) { background-color: #1aab5f; }

/* ==========================================================================
   ACHIEVEMENTS (Thành tựu như ảnh 3)
   ========================================================================== */
.achievements-section {
  background-color: var(--bg-light);
  text-align: center;
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  margin-bottom: 40px;
}

.achievement-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.achievement-circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background-color: var(--primary-green);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-white);
  margin-bottom: 20px;
  box-shadow: 0 6px 15px rgba(0, 103, 56, 0.15);
}

.achievement-circle svg {
  width: 50px;
  height: 50px;
}

.achievement-item h4 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary-green);
  margin-bottom: 8px;
}

.achievement-item p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
  max-width: 200px;
}

/* ==========================================================================
   BRANCH & REGISTRATION (Khối chọn chi nhánh như ảnh 3)
   ========================================================================== */
.branch-section {
  background-color: var(--bg-white);
}

.branch-box {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 40px 50px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.branch-content h3 {
  font-size: 1.8rem;
  color: var(--primary-green);
  font-weight: 800;
  margin-bottom: 12px;
}

.branch-content p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 25px;
}

.branch-selector-form {
  display: flex;
  gap: 15px;
}

.branch-selector-form select {
  flex: 1;
  padding: 14px 20px;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-white);
  font-size: 0.9rem;
}

.branch-image img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   TESTIMONIALS & VIDEOS (Cảm nhận và Youtube Thumbnails như ảnh 4)
   ========================================================================== */
.testimonials-section {
  background-color: var(--bg-light);
}

/* 3 thumbnail video nằm ngang */
.video-thumbnails-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 50px;
}

/* Card chứa iframe Facebook Reel (dạng ngang 16:9) */
.fb-video-card {
  position: relative;
  aspect-ratio: 16/9;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 4px solid var(--bg-white);
  background-color: #000;
}

.fb-video-card iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-thumb-card {
  position: relative;
  aspect-ratio: 16/9;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 4px solid var(--bg-white);
  cursor: pointer;
}

.video-thumb-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-thumb-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: rgba(227, 28, 121, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-white);
  font-size: 1.5rem;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  transition: var(--transition);
}

.video-thumb-card:hover .video-thumb-play-btn {
  background-color: var(--accent-pink);
  transform: translate(-50%, -50%) scale(1.1);
}

/* 3 testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 40px;
}

.testimonial-card {
  background-color: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  position: relative;
  transition: var(--transition);
}

.testimonial-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 20px;
}

.testimonial-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--primary-green-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--primary-green);
  border: 2px solid var(--primary-green);
  font-size: 1.2rem;
}

.testimonial-user-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-dark);
}

.testimonial-user-info p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.testimonial-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  font-style: italic;
}

/* Partners (Đối tác chân trang) */
.partners-block {
  margin-top: 60px;
  text-align: center;
  border-top: 1px solid var(--border-color);
  padding-top: 40px;
}

.partners-block h5 {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 25px;
}

.partners-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 50px;
  flex-wrap: wrap;
  opacity: 0.7;
}

.partner-logo {
  height: 45px;
  filter: grayscale(100%);
  transition: var(--transition);
}

.partner-logo:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* ==========================================================================
   FAQ SECTION (Thành phần mới bổ sung để gỡ bỏ rào cản)
   ========================================================================== */
.faq-section {
  background-color: var(--bg-white);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--primary-green);
}

.faq-question {
  padding: 20px 24px;
  background-color: var(--bg-card);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-dark);
  user-select: none;
}

.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--primary-green);
  transition: var(--transition);
}

.faq-item.active .faq-question::after {
  content: '−';
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  background-color: var(--bg-white);
}

.faq-answer-content {
  padding: 20px 24px;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  border-top: 1px solid var(--border-color);
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
}

/* ==========================================================================
   FOOTER (Ảnh 5 - Nền xanh lá cây đặc trưng)
   ========================================================================== */
.main-footer {
  background-color: var(--primary-green-hover);
  color: var(--bg-white);
  padding: 70px 0 30px;
  font-size: 0.8rem;
  line-height: 1.7;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr 1.1fr 0.8fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 20px;
  text-transform: uppercase;
  position: relative;
  letter-spacing: 0.5px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 30px;
  height: 2px;
  background-color: var(--accent-pink);
}

.footer-about .footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.2rem;
  margin-bottom: 20px;
}

.footer-about .footer-logo svg {
  height: 40px;
  fill: var(--bg-white);
}

.footer-socials {
  display: flex;
  gap: 12px;
  margin: 20px 0;
}

.social-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-white);
  transition: var(--transition);
}

.social-icon:hover {
  background-color: var(--accent-pink);
  transform: translateY(-2px);
}

.footer-hotline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  border: 1.5px solid var(--bg-white);
  border-radius: var(--radius-sm);
  font-weight: 700;
  margin-top: 10px;
}

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

.footer-col a {
  color: rgba(255, 255, 255, 0.8);
}

.footer-col a:hover {
  color: var(--accent-orange);
  padding-left: 5px;
}

.footer-cert {
  margin-top: 20px;
}

.footer-cert img {
  height: 45px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 30px;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.75rem;
}

/* ==========================================================================
   POPUP REGISTRATION SUCCESS
   ========================================================================== */
.popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.popup-overlay.active {
  opacity: 1;
  visibility: visible;
}

.popup-content {
  background-color: var(--bg-white);
  padding: 40px;
  border-radius: var(--radius-md);
  max-width: 500px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-lg);
  position: relative;
  transform: scale(0.8);
  transition: var(--transition);
}

.popup-overlay.active .popup-content {
  transform: scale(1);
}

.popup-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: var(--primary-green-light);
  color: var(--primary-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  margin: 0 auto 20px;
}

.popup-content h3 {
  font-size: 1.5rem;
  color: var(--primary-green);
  font-weight: 800;
  margin-bottom: 12px;
}

.popup-content p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 25px;
  line-height: 1.5;
}

.popup-close-btn {
  position: absolute;
  top: 15px;
  right: 15px;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  background: none;
}

/* ==========================================================================
   MEDIA QUERIES (RESPONSIVE DESIGN)
   ========================================================================== */
@media (max-width: 1024px) {
  :root {
    --container-width: 950px;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .register-form {
    grid-template-columns: 1fr 1fr;
  }
  
  .form-terms {
    grid-column: span 1;
  }
  
  .form-submit-btn-wrapper {
    grid-column: span 1;
  }
  
  .solution-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .roadmap-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .programs-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .achievements-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .section-padding {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  /* Mobile Menu */
  .nav-toggle {
    display: flex;
  }
  
  .main-nav {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 80%;
    height: calc(100vh - 80px);
    background-color: var(--bg-white);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    padding: 40px 24px;
    z-index: 999;
  }
  
  .main-nav.active {
    left: 0;
  }
  
  .main-nav ul {
    flex-direction: column;
    gap: 24px;
  }
  
  .main-nav a {
    font-size: 1.1rem;
  }
  
  .header-actions {
    gap: 10px;
  }
  
  .btn-nav-study {
    padding: 8px 16px;
    font-size: 0.75rem;
  }
  
  /* Hero */
  .hero-section {
    padding: 40px 0 80px;
  }
  
  .hero-section::before, .hero-section::after {
    display: none; /* Ẩn dải chéo trên màn hình nhỏ để tăng diện tích hiển thị */
  }
  
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .hero-content {
    text-align: center;
    padding-right: 0;
  }
  
  .hero-title {
    font-size: 1.8rem;
  }
  
  .register-form-container {
    margin-top: 0;
  }
  
  .register-form {
    grid-template-columns: 1fr;
  }
  
  .form-terms {
    grid-column: span 1;
    text-align: center;
  }
  
  .form-submit-btn-wrapper {
    grid-column: span 1;
  }
  
  .promo-grid {
    grid-template-columns: 1fr;
  }
  
  /* Problems */
  .problems-grid {
    grid-template-columns: 1fr;
  }
  
  /* Epiphany */
  .epiphany-comparison {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .epiphany-box {
    padding: 30px 20px;
  }
  
  /* Branch */
  .branch-box {
    grid-template-columns: 1fr;
    padding: 30px 20px;
  }
  
  .branch-selector-form {
    flex-direction: column;
  }
  
  /* Videos & Testimonials */
  .video-thumbnails-grid {
    grid-template-columns: 1fr;
  }
  
  .programs-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .programs-grid {
    grid-template-columns: 1fr;
  }
  
  .achievements-grid {
    grid-template-columns: 1fr;
  }
  
  .section-title {
    font-size: 1.6rem;
  }
}