* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  overflow-x: hidden;
}

.img-mb, .mb-only { display: none !important; }

@media (max-width: 768px) {
  .img-pc, .pc-only { display: none !important; }
  .img-mb, .mb-only { display: block !important; }
  .banner img.img-mb,
  .section-img img.img-mb,
  .section-bg img.img-mb { width: 100%; height: auto; }
}

body {
  font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f5f5f5;
}

/* ===== UTILITY CLASSES ===== */

/* Fonts */
.font-barlow { font-family: 'Barlow', sans-serif; }
.font-inter { font-family: 'Inter', sans-serif; }
.font-bebas { font-family: 'Bebas Neue', sans-serif; }

/* Font weights */
.fw-400 { font-weight: 400; }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }

/* Font sizes */
.fs-14 { font-size: 14px; }
.fs-16 { font-size: 16px; }
.fs-18 { font-size: 18px; }
.fs-20 { font-size: 20px; }
.fs-22 { font-size: 22px; }
.fs-24 { font-size: 24px; }
.fs-30 { font-size: 30px; }
.fs-34 { font-size: 34px; }
.fs-36 { font-size: 36px; }
.fs-40 { font-size: 40px; }

/* Colors */
.text-navy { color: #00285a; }
.text-white { color: #fff; }
.text-red { color: #cf2027; }
.text-gold { color: #e8c547; }
.text-dark { color: rgba(0, 40, 90, 1); }
.text-gray { color: #666; }

/* Text */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-upper { text-transform: uppercase; }
.text-italic { font-style: italic; }

/* Flexbox */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-shrink-0 { flex-shrink: 0; }

/* Background */
.lh-120 { line-height: 120%; }

.bg-btn-red { background: linear-gradient(to bottom, #cf2027, #691014); }
.bg-navy-gradient { background: linear-gradient(2.69deg, #00285A 2.43%, #00409F 107.35%); }

/* ===== SECTION 1: HEADER / NAVBAR ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 96px;
  background: #fff;
  box-shadow: 0 4px 4.8px rgba(0, 0, 0, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.header-inner {
  width: 100%;
  max-width: 1300px;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  display: flex;
  align-items: center;
}

.header-logo img {
  height: 50px;
  width: auto;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 48px;
}

.header-nav a {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 16px;
  color: #00285a;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  transition: color 0.2s;
}

.header-nav a:hover {
  color: #cf2027;
}

.btn-buy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 155px;
  height: 40px;
  text-decoration: none;
  border-radius: 35px;
  background: linear-gradient(180deg, #CF2027 0%, #691014 122.32%);
  box-shadow: 0px 4px 4px 0px rgba(0, 0, 0, 0.1);
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 20px;
  line-height: 40px;
  letter-spacing: 0;
  text-align: center;
  color: rgba(255, 255, 255, 1);
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-buy:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}

/* ===== SECTION 2: HERO (Banner + Combo + Video + Form) ===== */
.hero-section {
  position: relative;
  width: 100%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.hero-section .combo-desc {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  margin: 0;
  padding: 24px 20px;
  z-index: 2;
}

.hero-combo-tag {
  position: absolute;
  top: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  white-space: nowrap;
  font-size: 60px;
  line-height: 1.1;
  letter-spacing: 0.03em;
  color: #fff;
  -webkit-text-stroke: 3px #C8952E;
  paint-order: stroke fill;
  text-shadow:
    0 4px 8px rgba(0, 0, 0, 0.6),
    0 0 24px rgba(200, 149, 46, 0.25);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

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

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0) 0%, #F9F9F9 100%);
}

.hero-section .container {
  position: relative;
  z-index: 1;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Intro Section */
.intro-section {
  position: relative;
}

.intro-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 122px;
  background: linear-gradient(180deg, #E9EEF7 0%, rgba(233, 238, 247, 0) 100%);
  z-index: 1;
  pointer-events: none;
}

.intro-section::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 122px;
  background: linear-gradient(180deg, rgba(245, 245, 245, 0) 0%, #F5F5F5 60%, #FFFFFF 100%);
  z-index: 10;
  pointer-events: none;
}

.intro-section .container {
  position: relative;
  max-width: 1300px;
  margin: 0 auto;
  padding: 15px 20px;
}

.intro-section .hero-bg {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.intro-section .hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.intro-section .hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0) 0%, #F9F9F9 100%);
}

.intro-section .container > *:not(.hero-bg) {
  position: relative;
  z-index: 1;
}

/* Banner */
.banner {
  position: relative;
  z-index: 1;
  width: 100%;
}

.banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* Combo title */
.combo-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 20px;
  padding-top: 40px;
}

.combo-title-line {
  width: 87px;
  height: 3px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.6));
}

.combo-title-line:last-child {
  background: linear-gradient(90deg, rgba(255,255,255,0.6), transparent);
}

.combo-title h2 {
  font-size: 34px;
  letter-spacing: 1px;
}

.combo-desc {
  font-family: 'Roboto', sans-serif;
  font-weight: 700;
  font-size: 22px;
  line-height: 1;
  letter-spacing: 0;
  text-align: center;
  color: rgba(0, 40, 90, 1);
  max-width: 700px;
  margin: 0 auto 40px;
}

/* Pillars grid */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 1220px;
  margin: 0 auto 50px;
}

.pillar-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px 20px;
  border-radius: 12px;
  background: linear-gradient(180deg, #00409f 3.94%, #001153 102.93%);
  box-shadow: 0 3px 5px rgba(0, 26, 132, 0.29);
  min-height: 109px;
}

.pillar-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  filter: drop-shadow(0 4px 4px rgba(0, 54, 232, 0.45));
}

.pillar-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.pillar-card p {
  font-size: 20px;
  line-height: 1.35;
}

/* Video + Form row */
.video-form-row {
  display: flex;
  gap: 24px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto 50px;
}

.video-wrapper {
  width: 710px;
  flex-shrink: 0;
  border-radius: 8px;
  overflow: hidden;
  background: #000;
  aspect-ratio: 16 / 9;
}

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

/* Order form */
.order-form-box {
  flex: 1;
  min-width: 340px;
  background: #fff;
  border: 1px solid #00285a;
  border-radius: 15px;
  padding: 30px 20px 24px;
  box-shadow: 0 4px 4px 4px rgba(0, 40, 90, 0.14);
}

.order-form-box h3 {
  font-size: 24px;
  margin-bottom: 24px;
  line-height: 1.3;
}

.order-form-box h3 span {
  display: block;
}

.order-form-box input {
  display: block;
  width: 100%;
  height: 45px;
  background: #ededed;
  border: none;
  border-radius: 10px;
  padding: 0 16px;
  font-family: 'Inter', sans-serif;
  font-size: 18px;
  color: rgba(0, 40, 90, 1);
  margin-bottom: 6px;
}

.order-form-box input::placeholder {
  color: #959595;
}

.order-form-box select {
  display: block;
  width: 100%;
  height: 45px;
  background: #ededed;
  border: none;
  border-radius: 10px;
  padding: 0 16px;
  font-family: 'Inter', sans-serif;
  font-size: 18px;
  color: rgba(0, 40, 90, 1);
  margin-bottom: 6px;
  appearance: none;
  outline: none;
  cursor: pointer;
}

.order-form-box .location-row {
  display: flex;
  gap: 8px;
  margin-bottom: 0;
}

.order-form-box .location-row select {
  flex: 1;
  margin-bottom: 6px;
}

.order-form-box .form-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.order-form-box .form-row input {
  width: 187px;
  flex-shrink: 0;
}

.order-form-box .price-text {
  font-size: 20px;
}


.btn-order {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 473px;
  height: 44px;
  margin: 20px auto 0;
  font-size: 23px;
  text-decoration: none;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-order:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(207, 32, 39, 0.4);
}

/* ===== SECTION 3: Full-width image sections ===== */
.section-img {
  width: 100%;
  line-height: 0;
}

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

/* ===== SECTION 4: BỘ SÁCH NÀY DÀNH CHO AI ===== */
.target-section {
  position: relative;
  padding: 60px 0 50px;
  overflow: hidden;
}

.target-section .section-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.target-section .container {
  position: relative;
  z-index: 1;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 20px;
}

.target-section .section-title {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 50px;
  line-height: 40px;
  letter-spacing: 0;
  text-align: center;
  text-transform: uppercase;
  background: linear-gradient(91.03deg, #00285A -4.91%, #0055C0 37.73%, #00285A 74.21%, #0055C0 111.81%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0px 4px 4px rgba(0, 0, 0, 0.1));
  margin-bottom: 40px;
}

.target-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 40px;
  padding-top: 74px;
}

.target-card {
  width: 304px;
  height: 363px;
  border-radius: 12px;
  background: linear-gradient(180deg, #FFFFFF 16.83%, #EFF1F6 100%);
  border: 1px solid rgba(0, 40, 90, 0.16);
  text-align: center;
  padding: 90px 20px 30px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow: visible;
}

.target-card .hex-icon {
  position: absolute;
  top: -74px;
  left: 50%;
  transform: translateX(-50%);
  width: 167px;
  height: 147px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.target-card .hex-icon .hex-icon-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.target-card .hex-icon .hex-icon-svg {
  position: relative;
  z-index: 1;
  width: 70px;
  height: 70px;
  object-fit: contain;
}

.target-card .role {
  font-family: 'Roboto', sans-serif;
  font-weight: 700;
  font-size: 22px;
  line-height: 1;
  letter-spacing: 0;
  color: rgba(0, 40, 90, 1);
  margin-bottom: 5px;
}

.target-card .separator {
  width: 20px;
  height: 2px;
  background: rgba(0, 40, 90, 1);
  margin: 0 auto 12px;
  flex-shrink: 0;
}

.target-card .desc {
  font-family: 'Roboto', sans-serif;
  font-weight: 400;
  font-size: 20px;
  line-height: 1;
  letter-spacing: 0;
  color: rgba(0, 40, 90, 1);
}

.target-quote {
  font-family: 'Roboto', sans-serif;
  font-weight: 700;
  font-size: 22px;
  line-height: 1;
  letter-spacing: 0;
  text-align: center;
  text-transform: uppercase;
  color: rgba(0, 40, 90, 1);
  max-width: 800px;
  margin: 0 auto 50px;
}

/* ===== SECTION 5: HỆ THỐNG TƯ DUY ===== */
.thinking-section {
  position: relative;
  padding: 50px 0 60px;
  overflow: hidden;
}

.thinking-section .section-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.thinking-section .section-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(178.25deg, rgba(2, 22, 55, 0) 54.35%, #031738 68.43%);
}

.thinking-section .container {
  position: relative;
  z-index: 1;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 20px;
  text-align: center;
}

.thinking-heading {
  font-size: 50px;
  margin-bottom: 8px;
  letter-spacing: 1px;
  background: linear-gradient(180deg, #D4A94B 0%, #F5E5A3 40%, #C8952E 60%, #A07422 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.thinking-subheading {
  font-size: 30px;
  line-height: 40px;
  margin-bottom: 12px;
}

.thinking-subtitle-img {
  max-width: 565px;
  margin: 0 auto 20px;
}

.thinking-subtitle-img img {
  width: 100%;
  height: auto;
  mix-blend-mode: screen;
}

.thinking-desc {
  font-size: 22px;
  line-height: 100%;
  max-width: 800px;
  margin: 0 auto 40px;
}

/* Book Showcase */
.book-showcase {
  gap: 50px;
  margin-bottom: 40px;
  justify-content: center;
}

.book-slides {
  flex: 1;
  min-width: 0;
  overflow: visible;
  display: flex;
  justify-content: center;
}

.book-slide {
  width: 100%;
}

.carousel-arrow {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(360deg, #FFFFFF 8.33%, #CAE3EE 93.33%);
  color: #00285a;
  font-size: 22px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.2s;
}

.carousel-arrow:hover {
  opacity: 0.8;
}

.book-showcase-inner {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  gap: 30px;
  align-items: flex-start;
  position: relative;
  padding: 30px;
  border-radius: 12px;
}

.book-showcase-inner .showcase-frame-bg {
  position: absolute;
  inset: -40px;
  width: calc(100% + 80px);
  height: calc(100% + 80px);
  object-fit: fill;
  border-radius: 12px;
  z-index: 0;
}

.book-showcase-inner .book-cover-side,
.book-showcase-inner .book-toc-grid {
  position: relative;
  z-index: 1;
}

/* Book Cover Side */
.book-cover-side {
  flex: 1;
  min-width: 0;
  align-self: center;
}

.book-cover-row {
  display: contents;
}

.book-arrow {
  display: none;
}

.book-cover-img {
  position: relative;
  width: 320px;
  filter: drop-shadow(0 8px 24px rgba(0,0,0,0.5));
}

.book-cover-img::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(150, 210, 255, 0.55) 0%, rgba(100, 180, 255, 0.3) 30%, rgba(60, 140, 255, 0.1) 55%, transparent 75%);
  z-index: -1;
  pointer-events: none;
}

.book-cover-img img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.book-cover-title {
  font-size: 22px;
  line-height: 25px;
  margin-top: -50px;
  position: relative;
  z-index: 1;
  margin-bottom: 4px;
  text-shadow: 0px 4px 4px rgba(0, 0, 0, 0.1);
}

.book-cover-sub {
  font-size: 18px;
  line-height: 19px;
  color: #fff;
  position: relative;
  z-index: 1;
  text-shadow: 0px 4px 4px rgba(0, 0, 0, 0.1);
}

/* TOC Grid */
.book-toc-grid {
  flex-shrink: 0;
  display: grid;
  grid-template-columns: repeat(3, 269px);
  grid-template-rows: repeat(2, 320px);
  gap: 15px;
  margin-top: 20px;
  justify-content: center;
}

.toc-card {
  width: 269px;
  height: 320px;
  background: linear-gradient(178.35deg, #DFE5EB -7.87%, #FFFFFF 44.77%, #DFE5EB 98.43%);
  border-radius: 8px;
  box-shadow: 0px 4px 8.2px 0px rgba(0, 64, 159, 0.12);
  padding: 0 10px 10px;
  text-align: left;
  overflow: hidden;
}

.toc-card:not(:has(p)):not(:has(ul)) {
  background: transparent;
  box-shadow: none;
  padding-bottom: 0;
}

.toc-grid-slide2 {
  grid-template-rows: 320px auto auto;
}
.toc-grid-slide2 > .toc-card:nth-child(4),
.toc-grid-slide2 > .toc-card:nth-child(5) { grid-row: 2 / 4; }
.toc-grid-slide2 > .toc-card:nth-child(6) { grid-column: 3; grid-row: 2; height: auto; }
.toc-grid-slide2 > .toc-card:nth-child(7) { grid-column: 3; grid-row: 3; height: auto; }
.toc-grid-slide2 > .toc-card:nth-child(7):not(:has(ul)) {
  background: transparent;
  box-shadow: none;
  padding-bottom: 0;
}

.toc-grid-4col {
  grid-template-columns: repeat(12, 56px);
  grid-template-rows: 320px 320px;
}

.toc-grid-4col .toc-card {
  width: auto;
}

.toc-grid-4col > .toc-card:nth-child(-n+4) {
  grid-column: span 3;
}

.toc-grid-4col > .toc-card:nth-child(n+5),
.toc-grid-4col > .toc-card-group {
  grid-column: span 4;
}

.toc-grid-slide4 {
  grid-template-columns: 269px 1fr 180px;
  width: 837px;
}

.toc-grid-slide4 > .toc-card:nth-child(-n+3) {
  width: 269px;
}

.toc-grid-slide4 > .toc-card:nth-child(3) {
  justify-self: end;
}

.toc-grid-slide4 .toc-card-group .toc-card {
  width: auto;
}

.toc-grid-slide4 > .toc-card-group:last-child .toc-part {
  text-align: left;
}

.toc-grid-slide5 {
  grid-template-columns: repeat(3, 269px);
  grid-template-rows: auto auto;
}

.toc-grid-slide5 > .toc-card {
  height: auto;
}

.toc-grid-slide5 > .toc-card:nth-child(1) { grid-column: 1; grid-row: 1; }
.toc-grid-slide5 > .toc-card:nth-child(2) { grid-column: 2; grid-row: 1 / span 2; }
.toc-grid-slide5 > .toc-card:nth-child(3) { grid-column: 3; grid-row: 1; }
.toc-grid-slide5 > .toc-card:nth-child(4) { grid-column: 1; grid-row: 2; }
.toc-grid-slide5 > .toc-card:nth-child(5) { grid-column: 3; grid-row: 2; }

.toc-grid-slide5 > .toc-card:nth-child(5):not(:has(ul)) {
  background: transparent;
  box-shadow: none;
  padding-bottom: 0;
}

.toc-card-group {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.toc-card-group .toc-card {
  height: auto;
}

.toc-card-group .toc-card:not(:has(ul)) {
  background: transparent;
  box-shadow: none;
  padding-bottom: 0;
}


.toc-part {
  font-size: 14px;
  min-height: 52px;
  display: flex;
  align-items: center;
  padding: 8px 10px;
  margin: 0 -10px 8px;
  border-radius: 0 0 5px 5px;
  box-shadow: 0px 4px 4px 0px rgba(0, 0, 0, 0.25) inset, 0px 4px 4px 0px rgba(0, 100, 200, 0.24);
  line-height: 16px;
  letter-spacing: 0;
}

.toc-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 8px;
}

.toc-card ul li {
  font-family: 'Barlow', sans-serif;
  font-size: 14px;
  line-height: 16px;
  color: rgba(0, 40, 90, 1);
  padding: 6px 0;
  border-bottom: 0.5px solid rgba(195, 195, 195, 1);
}

.toc-card ul li:last-child {
  border-bottom: none;
}

.toc-exercise {
  font-family: 'Barlow', sans-serif;
  font-size: 14px;
  line-height: 16px;
  margin-top: 6px;
}

.toc-card-highlight .toc-part {
  text-align: center;
}

/* CTA Button */
.btn-order-lg {
  position: absolute;
  bottom: -53px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: inline-flex;
  width: 230px;
  height: 46px;
  background: linear-gradient(5.48deg, #FFFFFF -41.31%, #930000 -31.32%, #FF000A 118.43%);
  box-shadow: 0px 4px 15px 0px rgba(102, 0, 0, 0.25);
  font-size: 22px;
  line-height: 100%;
  text-decoration: none;
  border: none;
  border-radius: 0;
  clip-path: polygon(8% 0%, 92% 0%, 100% 50%, 92% 100%, 8% 100%, 0% 50%);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-order-lg:hover {
  transform: translateX(-50%) translateY(-2px);
  box-shadow: 0px 6px 20px 0px rgba(102, 0, 0, 0.35);
}

/* ===== SECTION 6: TÁC GIẢ BỘ SÁCH ===== */
.author-section {
  position: relative;
  overflow: hidden;
}

.author-section .section-bg {
  position: relative;
  width: 100%;
  z-index: 0;
}

.author-section .section-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(180deg, #031738 0%, transparent 100%);
  z-index: 1;
}

.author-section .section-bg img {
  position: relative;
  width: 100%;
  height: auto;
  display: block;
}

.author-section .container {
  position: absolute;
  inset: 0;
  z-index: 1;
  max-width: 1300px;
  margin: 0 auto;
  gap: 50px;
  height: 647px;
  top: 50%;
  transform: translateY(-50%);
}

/* Author Left */
.author-left {
  flex: 1;
  min-width: 0;
  align-self: flex-end;
}

.author-label {
  width: 319px;
  height: 52px;
  margin: 0 auto 0 50px;
  font-size: 30px;
  line-height: 100%;
  color: rgba(0, 40, 90, 1);
  background: rgba(255, 255, 255, 1);
  border-radius: 14px 14px 0 0;
}

.author-name-box {
  width: 458px;
  height: 138px;
  margin: 0 auto;
  padding: 16px 20px 16px 50px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  position: relative;
  z-index: 0;
}

.author-name-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, #FFFFFF 0%, #7ED4FF 111.01%);
  clip-path: path('M 20,0 L 367,0 Q 372,0 374,4 L 454,100 Q 458,105 458,110 L 458,118 Q 458,138 438,138 L 20,138 Q 0,138 0,118 L 0,20 Q 0,0 20,0 Z');
  z-index: -2;
  filter: drop-shadow(0px 4px 15px rgba(0, 140, 255, 0.4));
}

.author-name-box::after {
  content: '';
  position: absolute;
  inset: 1.5px;
  background: linear-gradient(25.77deg, rgba(0, 90, 164, 0.91) -6.31%, rgba(20, 149, 255, 0.91) 94.99%);
  clip-path: path('M 18.5,0 L 364.5,0 Q 369.5,0 371.5,4 L 451,98.5 Q 455,103.5 455,108.5 L 455,116.5 Q 455,135 436.5,135 L 18.5,135 Q 0,135 0,116.5 L 0,18.5 Q 0,0 18.5,0 Z');
  z-index: -1;
}

.author-name {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 60px;
  line-height: 100%;
  margin-bottom: 8px;
}

.author-role {
  font-size: 20px;
  line-height: 27px;
}

/* Author Right */
.author-right {
  width: 761px;
  height: 647px;
  flex-shrink: 0;
  background: linear-gradient(179.15deg, rgba(0, 64, 159, 0.75) 3.94%, rgba(0, 17, 83, 0.83) 102.93%);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 25px;
  box-shadow: 0px 3px 5px 0px rgba(0, 26, 132, 0.29), 0px -2px 15.1px 0px rgba(99, 142, 249, 0.5) inset;
  display: flex;
  align-items: center;
}

.author-info {
  list-style: none;
  padding: 30px 35px;
}

.author-info li {
  font-family: 'Barlow', sans-serif;
  font-weight: 400;
  font-size: 17px;
  line-height: 25px;
  color: rgba(255, 255, 255, 1);
  text-align: justify;
  padding: 6px 0;
  padding-left: 16px;
  position: relative;
}

.author-info li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: #e8c547;
}

.author-info li + li {
  border-top: 0.5px solid rgba(255, 255, 255, 0.1);
}

/* ===== SECTION 7: NHỮNG CON SỐ ĐÁNG TỰ HÀO ===== */
.stats-section {
  position: relative;
  overflow: hidden;
  background: #021636;
}

.stats-section .section-bg {
  position: relative;
  width: 100%;
  z-index: 0;
}

.stats-section .section-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(180deg, #031738 0%, transparent 100%);
  z-index: 1;
}

.stats-section .section-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(185.23deg, #001742 8.89%, rgba(0, 40, 90, 0) 61.09%, #021736 97.17%);
}

.stats-section .section-bg img {
  width: 100%;
  height: auto;
  display: block;
}

.stats-section .container {
  position: absolute;
  inset: 0;
  z-index: 1;
  max-width: 1300px;
  margin: 0 auto;
  padding: 30px 20px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stats-deco {
  margin-bottom: 24px;
}

.stats-deco img {
  max-width: 100%;
  height: auto;
}

.stats-heading {
  font-size: 50px;
  margin-bottom: 8px;
  background: linear-gradient(180deg, #D4A94B 0%, #F5E5A3 40%, #C8952E 60%, #A07422 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stats-grid {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 60px;
  margin: auto 0;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.stat-item img {
  height: 60px;
  width: auto;
}

.stat-item p {
  font-size: 22px;
  line-height: 22px;
}

/* ===== SECTION 8: CÂU CHUYỆN THÀNH CÔNG CỦA HBR ===== */
.success-section {
  position: relative;
  overflow: hidden;
  padding: 60px 0;
  background: #021636;
}

.success-section .section-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.success-section .container {
  position: relative;
  z-index: 1;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.success-heading {
  font-size: 50px;
  margin-bottom: 10px;
  background: linear-gradient(180deg, #D4A94B 0%, #F5E5A3 40%, #C8952E 60%, #A07422 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.success-deco {
  max-width: 400px;
  margin: 0 auto 30px;
}

.success-deco img {
  width: 100%;
  height: auto;
  mix-blend-mode: screen;
}

/* Success Carousel */
.success-carousel {
  width: 100%;
  gap: 20px;
  margin-bottom: 30px;
}

.success-slides {
  flex: 1;
  display: flex;
  gap: 16px;
  overflow: hidden;
  scroll-behavior: smooth;
}

.success-slides img {
  flex: 0 0 calc(25% - 12px);
  min-width: 0;
  height: auto;
  border-radius: 8px;
  object-fit: cover;
}

/* Success desc */
.success-desc {
  font-size: 20px;
  line-height: 30px;
  max-width: 900px;
  margin-bottom: 30px;
}

/* Website screenshots */
.success-websites {
  gap: 24px;
  margin-bottom: 30px;
}

.success-websites img {
  width: 414px;
  height: 112px;
  object-fit: cover;
  border-radius: 8px;
}

/* CTA button in success section */
.success-section .btn-order-lg {
  position: relative;
  bottom: auto;
  left: auto;
  transform: none;
  margin-top: 10px;
}

/* ===== SECTION: TESTIMONIAL ===== */

.testimonial-section .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.testimonial-label {
  height: 71px;
  margin: 0 auto 48px;
  font-size: 40px;
  line-height: 40px;
  white-space: nowrap;
  color: #fff;
  background: linear-gradient(11.05deg, #A45A0B -29.42%, #F4A046 108.58%);
  box-shadow: 0px 4px 15px 0px rgba(109, 67, 25, 0.2);
  clip-path: polygon(4% 0%, 96% 0%, 100% 50%, 96% 100%, 4% 100%, 0% 50%);
  text-shadow: 0px 4px 4px rgba(0, 0, 0, 0.1);
}

.testimonial-carousel {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  flex: 1;
  overflow: hidden;
}

.testimonial-card {
  background: rgba(255, 255, 255, 1);
  border-radius: 16px;
  box-shadow: 0px 9px 23.7px 0px rgba(20, 149, 255, 0.4);
  padding: 24px 24px 28px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.testimonial-fb {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
}

.testimonial-fb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.testimonial-avatar {
  width: 100%;
  text-align: center;
  margin-bottom: 12px;
}

.testimonial-avatar img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  border-radius: 8px;
}

.testimonial-author {
  text-align: center;
  padding-top: 8px;
}

.testimonial-name {
  font-size: 24px;
  line-height: 27px;
  letter-spacing: 0;
  color: rgba(135, 87, 0, 1);
}

.testimonial-title {
  font-size: 20px;
  line-height: 27px;
  letter-spacing: 0;
  color: rgba(135, 87, 0, 1);
}

.testimonial-title span {
  font-style: italic;
  font-weight: 400;
}

.testimonial-quote {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.testimonial-mark {
  flex-shrink: 0;
  margin-top: 2px;
  width: 38px;
  height: 30px;
}

.testimonial-text {
  font-size: 18px;
  line-height: 27px;
  letter-spacing: 0;
  text-align: justify;
  color: rgba(0, 40, 90, 1);
  font-weight: 400;
}

.testimonial-viewall {
  margin-top: 8px;
}

.testimonial-viewall a {
  font-size: 16px;
  color: rgba(0, 64, 140, 1);
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.testimonial-viewall a:hover {
  text-decoration: underline;
}

/* ===== SHARED BG WRAPPER ===== */
.sections-bg-wrapper {
  position: relative;
  padding-bottom: 30px;
}

.sections-bg-wrapper-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

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

.sections-bg-wrapper > section {
  position: relative;
  z-index: 1;
}

/* ===== SECTION 9: 06 GIÁ TRỊ CỐT LÕI ===== */
.value-section {
  padding: 40px 0;
}

.value-section .container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.value-label {
  height: 71px;
  margin: 0 auto 30px;
  font-size: 40px;
  line-height: 40px;
  white-space: nowrap;
  color: #fff;
  background: linear-gradient(11.05deg, #A45A0B -29.42%, #F4A046 108.58%);
  box-shadow: 0px 4px 15px 0px rgba(109, 67, 25, 0.2);
  clip-path: polygon(4% 0%, 96% 0%, 100% 50%, 96% 100%, 4% 100%, 0% 50%);
  text-shadow: 0px 4px 4px rgba(0, 0, 0, 0.1);
}

.value-heading {
  margin-bottom: 4px;
}

.value-number {
  font-size: 70px;
  line-height: 1;
  background: linear-gradient(91.03deg, #00285A -4.91%, #0055C0 37.73%, #00285A 74.21%, #0055C0 111.81%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0px 4px 4px rgba(0, 0, 0, 0.1));
}

.value-heading span:last-child {
  font-size: 50px;
  line-height: 40px;
  background: linear-gradient(91.03deg, #00285A -4.91%, #0055C0 37.73%, #00285A 74.21%, #0055C0 111.81%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0px 4px 4px rgba(0, 0, 0, 0.1));
}

.value-subheading {
  font-size: 40px;
  line-height: 40px;
  color: rgba(0, 40, 90, 1);
  margin-bottom: 40px;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  grid-auto-rows: 1fr;
}

.value-item {
  display: flex;
  flex-direction: column;
}

.value-card {
  flex: 1;
}

.value-card-header {
  gap: 12px;
}

.value-index {
  font-size: 60px;
  line-height: 1;
  flex-shrink: 0;
  background: linear-gradient(89.52deg, #00285A -37.46%, #0055C0 14.57%, #00285A 59.08%, #0055C0 104.95%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  mask-image: linear-gradient(180deg, #000 50%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, #000 50%, transparent 100%);
}

.value-title {
  flex: 1;
  font-size: 22px;
  line-height: 40px;
  padding: 4px 20px;
  background: linear-gradient(90deg, #04083B -13.2%, #004CBE 53.25%, #04083B 126.4%);
  border-radius: 25px;
}

.value-card {
  background: linear-gradient(180deg, #C2E3FF -61.9%, #EEF6FF 30.48%, #C2E3FF 147.62%);
  border: none;
  border-radius: 15px;
  overflow: hidden;
  margin-top: 12px;
  position: relative;
  display: flex;
  align-items: center;
}

.value-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 15px;
  padding: 1.5px;
  background: linear-gradient(180deg, #CBD9F4 0%, #95A5C3 100%);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  pointer-events: none;
}

.value-card-body {
  padding: 16px 20px;
  gap: 16px;
  align-items: center;
}

.value-card-body::before {
  content: '';
  flex-shrink: 0;
  width: 2px;
  height: 110px;
  background: radial-gradient(50% 50% at 50% 50%, #00317B 0%, rgba(55, 172, 255, 0) 100%);
  order: 1;
}

.value-card-body .value-icon {
  order: 0;
}

.value-card-body p {
  order: 2;
}

.value-icon {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
}

.value-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.value-card-body p {
  font-size: 22px;
  font-weight: 500;
  line-height: 26px;
  color: rgba(0, 40, 90, 1);
}

/* ===== SECTION 10: VÌ SAO BẠN NHẤT ĐỊNH PHẢI ĐỌC ===== */
.why-section{
  padding: 40px 0;
}
.why-section .container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 20px;
}

.why-content {
  margin-bottom: 40px;
}

.why-body {
  gap: 40px;
  align-items: flex-start;
}

.why-heading {
  font-size: 40px;
  line-height: 40px;
  margin-bottom: 16px;
  margin-left: 20px;
  background: linear-gradient(91.03deg, #00285A -4.91%, #0055C0 37.73%, #00285A 74.21%, #0055C0 111.81%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0px 4px 4px rgba(0, 0, 0, 0.1));
}

.why-sub {
  font-size: 25px;
  font-weight: 500;
  line-height: 26px;
  color: rgba(0, 40, 90, 1);
  margin-bottom: 24px;
  margin-left: 20px;
}

.why-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-left: 35px;
}

.why-item {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 523px;
  height: 110px;
  border-radius: 15px;
  background: rgba(253, 254, 255, 1);
  box-shadow: 0px 4px 11.6px 0px rgba(0, 0, 0, 0.09);
  padding: 0 24px 0 51px;
  position: relative;
  overflow: visible;
}

.why-item-icon {
  position: absolute;
  left: -40px;
  top: 50%;
  transform: translateY(-50%);
  width: 70px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.why-item-icon .why-icon-bg {
  position: absolute;
  inset: 0;
  width: 80px;
  height: 80px;
  object-fit: contain;
}

.why-item-icon .why-icon-svg {
  position: relative;
  z-index: 1;
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.why-item p {
  font-family: 'Barlow', sans-serif;
  font-weight: 500;
  font-size: 22px;
  line-height: 26px;
  letter-spacing: 0;
  color: rgba(0, 40, 90, 1);
}

/* Why Right */
.why-right {
  flex: 1;
}

.why-right img {
  width: 100%;
  height: auto;
  display: block;
}

/* Steps: ĐỌC - HIỂU - HÀNH ĐỘNG */
.why-steps {
  gap: 80px;
  margin-bottom: 30px;
  align-items: flex-start;
}

.why-step h4 {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 30px;
  line-height: 40px;
  letter-spacing: 0;
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 6px;
  background: linear-gradient(91.03deg, #00285A -4.91%, #0055C0 37.73%, #00285A 74.21%, #0055C0 111.81%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0px 4px 4px rgba(0, 0, 0, 0.1));
}

.why-step p {
  font-family: 'Barlow', sans-serif;
  font-weight: 500;
  font-size: 22px;
  line-height: 26px;
  letter-spacing: 0;
  text-align: center;
  color: rgba(0, 40, 90, 1);
}

.why-step-divider {
  width: 2px;
  height: 60px;
  background: radial-gradient(50% 50% at 50% 50%, #00285a 0%, transparent 100%);
  flex-shrink: 0;
  align-self: center;
}

/* Quote */
.why-quote {
  background: linear-gradient(90deg, rgba(0, 105, 190, 0) 0%, #003F8D 49.52%, rgba(0, 101, 184, 0) 100%);
  border-radius: 25px;
  padding: 20px 40px;
  margin-bottom: 10px;
}

.why-quote p {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 25px;
  line-height: 26px;
  letter-spacing: 0;
  text-align: center;
}

/* CTA override in why section */
.why-section .btn-order-lg {
  position: relative;
  bottom: auto;
  left: auto;
  transform: none;
}

/* ===== SECTION: PROMO / ORDER ===== */
.promo-section {
  position: relative;
  overflow: hidden;
  padding-top: 60px;
}


.promo-section .section-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(360deg, rgba(0, 24, 68, 0) 14.13%, #021736 74.11%);
}

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

.promo-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(2, 22, 54, 0.7) 0%, rgba(2, 22, 54, 0.6) 50%, rgba(2, 22, 54, 0.7) 100%);
  z-index: 1;
  pointer-events: none;
}

.promo-section .container {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
}

.promo-layout {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.promo-body {
  gap: 24px;
  align-items: flex-start;
}

/* LEFT */
.promo-left {
  flex: 1;
  min-width: 0;
}

.promo-eyebrow {
  font-size: 45px;
  line-height: 1.1;
  letter-spacing: 0.03em;
  margin-bottom: 6px;
  color: #fff;
  -webkit-text-stroke: 3px #C8952E;
  paint-order: stroke fill;
  text-shadow:
    0 4px 8px rgba(0, 0, 0, 0.6),
    0 0 24px rgba(200, 149, 46, 0.25);
}

.promo-heading {
  margin-bottom: 12px;
  text-align: left !important;
}

.promo-heading .text-white {
  font-size: 32px;
}

.promo-heading .text-white {
  -webkit-text-fill-color: #fff;
  background: none;
  background-clip: unset;
  -webkit-background-clip: unset;
}

.promo-deco {
  width: 420px;
  height: 3px;
  margin-bottom: 20px;
  background: linear-gradient(90deg,
    transparent 0%,
    #C8952E 20%,
    #F4E080 50%,
    #C8952E 80%,
    transparent 100%
  );
}

.promo-check {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  margin-top: 2px;
}

.promo-discount-price {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
  align-items: center;
}

.promo-discount {
  gap: 12px;
}

.promo-discount-text {
  font-size: 40px;
  line-height: 1;
  color: #fff;
  -webkit-text-stroke: 3px #C8952E;
  paint-order: stroke fill;
  text-shadow:
    0 4px 8px rgba(0, 0, 0, 0.6),
    0 0 24px rgba(200, 149, 46, 0.25);
}

.promo-price {
  flex-shrink: 0;
}

.promo-price-old {
  font-size: 16px;
  text-decoration: line-through;
  color: rgba(255, 255, 255, 1);
  margin-bottom: 2px;
  text-align: center;
}

.promo-price-new {
  font-family: 'Montserrat', sans-serif;
  font-weight: 800;
  font-size: 36px;
  line-height: 113.9999%;
  letter-spacing: 0;
  text-align: left;
  text-transform: uppercase;
  background: linear-gradient(270.22deg, #F9D58B 28.75%, #FFFADD 47.37%, #FFE7A8 70.4%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0px 4px 10.7px rgba(0, 0, 0, 0.51));
}

.promo-bonus-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
}

.promo-bonus {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.promo-bonus-text {
  font-weight: 500;
  font-size: 18px;
  line-height: 1;
  letter-spacing: 0;
  color: rgba(255, 255, 255, 1);
}

.promo-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 20px;
  padding-left: 8px;
}

.promo-feature-item {
  border-radius: 8px;
  padding: 20px 12px;
  background: rgba(255, 255, 255, 0.06);
}

.promo-feature-title {
  font-weight: 700;
  font-size: 18px;
  line-height: 1;
  letter-spacing: 0;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 1);
  margin-bottom: 4px;
}

.promo-feature-desc {
  font-weight: 500;
  font-size: 18px;
  line-height: 1;
  letter-spacing: 0;
  color: rgba(255, 255, 255, 1);
}

.promo-community {
  gap: 12px;
}

.promo-community-text {
  font-weight: 500;
  font-size: 18px;
  line-height: 1;
  letter-spacing: 0;
  color: rgba(255, 255, 255, 1);
}

/* RIGHT */
.promo-right {
  flex-shrink: 0;
  width: 440px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.promo-countdown {
  margin-bottom: 4px;
  background: rgba(20, 149, 255, 0.17);
  border-radius: 7px;
  padding: 16px 20px;
}

.promo-countdown-label {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 16px;
  line-height: 27px;
  letter-spacing: 0;
  text-align: center;
  color: #fff;
  margin-bottom: 10px;
}

.promo-timer {
  gap: 8px;
  align-items: flex-start;
}

.timer-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.timer-box {
  width: 58px;
  height: 52px;
  background: linear-gradient(180deg, #84D0FF 0%, #1495FF 100%);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: #fff;
  letter-spacing: 2px;
}

.timer-colon {
  font-size: 28px;
  line-height: 52px;
  opacity: 0.8;
}

.timer-label {
  font-size: 13px;
  opacity: 0.8;
}

/* Form box */
.promo-form-box {
  background: #fff;
  border: 1px solid #00285a;
  border-radius: 15px;
  padding: 30px 20px 24px;
  box-shadow: 0 4px 4px 4px rgba(0, 40, 90, 0.14);
}

.promo-form-title {
  font-size: 24px;
  line-height: 1.3;
  color: rgba(0, 40, 90, 1);
  margin-bottom: 24px;
}

.promo-form {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.promo-form input {
  display: block;
  width: 100%;
  height: 45px;
  background: #ededed;
  border: none;
  border-radius: 10px;
  padding: 0 16px;
  font-family: 'Inter', sans-serif;
  font-size: 18px;
  color: rgba(0, 40, 90, 1);
  outline: none;
  box-sizing: border-box;
}

.promo-form input::placeholder {
  color: #959595;
}

.promo-form select {
  display: block;
  width: 100%;
  height: 45px;
  background: #ededed;
  border: none;
  border-radius: 10px;
  padding: 0 16px;
  font-family: 'Inter', sans-serif;
  font-size: 18px;
  color: rgba(0, 40, 90, 1);
  appearance: none;
  outline: none;
  cursor: pointer;
  box-sizing: border-box;
}

.promo-form .location-row {
  display: flex;
  gap: 8px;
}

.promo-form .location-row select {
  flex: 1;
}

.promo-form-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.promo-form-row input {
  width: 120px;
  flex-shrink: 0;
}

.promo-total {
  font-size: 20px;
  color: rgba(0, 40, 90, 1);
  white-space: nowrap;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.promo-total span {
  color: #D0021B;
}

.promo-btn-submit {
  width: 100%;
  height: 52px;
  background: #D0021B;
  border: none;
  border-radius: 6px;
  font-size: 18px;
  letter-spacing: 0.04em;
  cursor: pointer;
  margin-top: 4px;
  transition: background 0.2s;
}

.promo-btn-submit:hover {
  background: #b00218;
}

/* ===== RESPONSIVE ===== */

/* --- 1200px --- */
@media (max-width: 1200px) {
  .book-showcase-inner {
    width: 100%;
  }
  .book-toc-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: auto;
    width: 100%;
  }
  .toc-card {
    width: auto;
    height: auto;
    min-height: 200px;
  }
  .author-right {
    width: auto;
    flex: 1;
    height: auto;
  }
  .why-item {
    width: 100%;
  }
}

/* --- 1024px (tablet landscape) --- */
@media (max-width: 1024px) {
  .header-nav { gap: 20px; }
  .header-nav a { font-size: 13px; }

  .hero-combo-tag { font-size: 42px; }

  .video-wrapper {
    width: 100%;
    max-width: 710px;
    aspect-ratio: 16 / 9;
    margin: 0 auto;
  }

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

  .video-form-row { flex-direction: column; align-items: center; }
  .price-text { font-size: 16px; }
  .order-form-box { width: 100%; padding: 16px 12px; }
  .order-form-box h3 { font-size: 16px; margin-bottom: 12px; }
  .order-form-box input, .order-form-box select { height: 36px; font-size: 14px; margin-bottom: 4px; border-radius: 8px; }
  .order-form-box .form-row input { width: 120px; }
  .order-form-box .price-text { font-size: 14px; }
  .btn-order { font-size: 14px; height: 40px; }

  .target-grid { grid-template-columns: repeat(2, 1fr); }
  .target-card { width: 100%; height: auto; min-height: 280px; }

  .thinking-heading { font-size: 36px; }
  .book-showcase { gap: 16px; }
  .book-showcase-inner { flex-direction: column; align-items: center; }

  .author-section .container {
    position: relative; inset: auto; transform: none;
    height: auto; flex-direction: column; padding: 0 20px; top: auto;
    background: transparent; z-index: 1;
  }
  .author-section { background: rgba(2, 23, 54, 1); }
  .author-section .section-bg { position: relative; height: auto; overflow: visible; z-index: 0; }
  .author-section .section-bg::before { background: linear-gradient(180deg, #031738 0%, transparent 15%); }
  .author-section .section-bg::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; top: auto; height: 150px; background: linear-gradient(0deg, #021736 0%, transparent 100%); z-index: 1; }
  .author-section .section-bg img { width: 100%; height: auto; }
  .author-right { width: 100%; height: auto; }
  .author-left { align-self: center; zoom: 0.7; position: relative; z-index: 2; }
  .author-name-box { width: 458px; max-width: none; }

  .stats-section .container {
    position: relative; inset: auto; transform: none; padding: 40px 20px; top: auto;
  }
  .stats-section .section-bg { position: absolute; inset: 0; }
  .stats-section .section-bg img { width: 100%; height: 100%; object-fit: cover; }
  .stats-section .container { position: relative; inset: auto; padding: 30px 16px; }

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

  .why-body { flex-direction: column; }
  .why-item { width: 100%; height: auto; min-height: 80px; padding: 16px 24px 16px 51px; }
  .why-list { padding-left: 45px; width: 100%; }
  .why-right { width: 100%; }
  .why-steps { gap: 40px; }

  .promo-body { flex-direction: column; }
  .promo-left { width: 100%; }
  .promo-right { width: 100%; }
  .promo-deco { width: 100%; }
}

/* --- 768px (tablet portrait) --- */
@media (max-width: 768px) {
  /* Header */
  .header { height: 64px; }
  .header-inner { padding: 0 16px; }
  .header-nav { display: none; }
  .header-logo img { height: 38px; }
  .btn-buy { font-size: 14px; width: 110px; height: 36px; line-height: 36px; }

  /* Video full width */
  .video-wrapper {
    width: 100%;
    max-width: 710px;
    aspect-ratio: 16 / 9;
    margin: 0 auto;
  }

  /* Hero */
  .hero-combo-tag { font-size: 28px; -webkit-text-stroke: 2px #C8952E; top: 16px; }
  .combo-desc { font-size: 15px; padding: 12px 16px; max-width: 100%; }

  /* Intro */
  .intro-section .container { padding: 24px 16px 40px; }
  .pillars-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .pillar-card { min-height: 80px; padding: 16px; }
  .pillar-icon img { width: 30px; height: 30px; }
  .pillar-card p { font-size: 10px; }

  /* Target */
  .target-section { padding: 40px 0 30px; }
  .target-section .section-title { font-size: 32px; margin-bottom: 24px; }
  .target-grid { grid-template-columns: repeat(2, 1fr); gap: 55px 16px; padding-top: 50px; }
  .target-card { height: auto; min-height: 220px; padding: 70px 16px 24px; }
  .target-card .hex-icon { width: 96px; height: 88px; top: -45px; }
  .target-card .role { font-size: 18px; }
  .target-card .desc { font-size: 12px; }
  .target-quote { font-size: 16px; }

  /* Thinking */
  .thinking-section { padding: 36px 0 40px; }
  .thinking-heading { font-size: 22px; line-height: 1.3; }
  .thinking-subheading { font-size: 18px; line-height: 1.4; }
  .thinking-desc { font-size: 16px; }
  .book-showcase { flex-direction: column; gap: 12px; }
  .book-showcase-inner { flex-direction: column; align-items: center; width: 100%; margin: 0 auto; padding: 16px 0; gap: 12px; }
  .book-showcase-inner .showcase-frame-bg { position: absolute !important; display: block !important; inset: -20px; width: calc(100% + 40px); height: calc(100% + 40px); object-fit: fill; transform: none; border-radius: 8px; }
  .book-cover-side { width: 100%; display: flex; flex-direction: column; align-items: center; }
  .book-cover-row { display: flex; align-items: center; justify-content: center; gap: 12px; width: 100%; }
  .book-arrow { display: flex; width: 32px; height: 32px; font-size: 14px; }
  .book-cover-img { display: block; text-align: center; width: auto; }
  .book-cover-img img { display: block; }
  .book-cover-img img.img-mb { width: 135px; height: 198px; }
  .book-cover-img::before { display: none; }
  .book-cover-title { display: block; font-size: 14px; line-height: 1.2; margin-top: 8px; white-space: normal; text-align: center; }
  .book-cover-title br { display: none; }
  .book-cover-sub { display: block; font-size: 12px; line-height: 1.2; margin-top: 4px; text-align: center; }
  .book-cover-sub::before { content: none; }
  .book-toc-grid, .book-toc-grid.toc-grid-4col, .book-toc-grid.toc-grid-slide2, .book-toc-grid.toc-grid-slide4, .book-toc-grid.toc-grid-slide5 { width: calc(100% - 30px); margin: 0 auto; grid-template-columns: repeat(2, 1fr) !important; grid-template-rows: unset !important; gap: 8px; }
  .toc-grid-4col > .toc-card:nth-child(-n+4),
  .toc-grid-4col > .toc-card:nth-child(n+5),
  .toc-grid-slide4 > .toc-card:nth-child(-n+3),
  .toc-grid-slide4 > .toc-card:nth-child(3) { grid-column: auto !important; justify-self: auto !important; }
  .toc-grid-slide2 > .toc-card { grid-column: auto !important; grid-row: auto !important; }
  .toc-grid-slide2 > .toc-card:nth-child(7) { grid-column: 1 / -1 !important; }
  .toc-grid-slide5 > .toc-card { grid-column: auto !important; grid-row: auto !important; }
  .toc-grid-slide5 > .toc-card:nth-child(5) { grid-column: 1 / -1 !important; }
  .toc-card-group { flex-direction: row; grid-column: 1 / -1 !important; width: 100% !important; min-width: 0; }
  .toc-card { width: 100% !important; height: auto !important; min-height: unset; padding: 0 10px 10px; }
  .toc-card-group > .toc-card.toc-card { flex: 1 !important; width: auto !important; min-width: 0; }
  .toc-part { font-size: 12px; height: auto; min-height: unset; line-height: 1.3; padding: 6px 10px; margin: 0 -10px 6px; }
  .toc-card ul li { font-size: 12px; line-height: 1.4; padding: 3px 0; }
  .toc-exercise { font-size: 12px; }
  .btn-order-lg { font-size: 14px; height: 40px; }
  .book-showcase > .carousel-arrow { display: none; }
  .book-cover-side { position: relative; }
  .book-cover-row { display: flex; align-items: center; justify-content: center; gap: 12px; }
  .book-cover-row .carousel-arrow { display: flex; width: 32px; height: 32px; font-size: 14px; }
  .success-carousel .carousel-arrow { display: flex; }

  /* Author */
  .author-section .section-bg { height: 300px; }
  .author-label { width: 230px; padding: 0 16px; margin-left: 0; font-size: 20px; }
  .author-name-box { padding: 12px 16px 12px 24px; }
  .author-name { font-size: 40px; }
  .author-role { font-size: 15px; }
  .author-info { padding: 20px 20px; }
  .author-info li { font-size: 14px; line-height: 20px; }

  /* Stats */
  .stats-section { padding: 0; }
  .stats-heading { font-size: 28px; }
  .stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .stat-item { width: calc(50% - 12px); }
  .stat-item p { font-size: 18px; line-height: 1.3; }

  /* Success */
  .success-section { padding: 40px 0; }
  .success-heading { font-size: 28px; }
  .success-slides img { flex: 0 0 calc(50% - 8px); }
  .success-websites { flex-direction: column; align-items: center; gap: 12px; }
  .success-websites img { width: 100%; height: auto; }
  .success-desc { font-size: 16px; line-height: 1.5; }

  /* Value */
  .value-section { padding: 30px 0; }
  .value-label {
    font-size: 18px; height: 50px;
  }
  .value-number { font-size: 44px; }
  .value-heading span:last-child { font-size: 28px; }
  .value-subheading { font-size: 22px; line-height: 1.3; margin-bottom: 24px; }
  .value-title { font-size: 15px; line-height: 1.3; padding: 6px 12px; border-radius: 20px; }
  .value-index { font-size: 40px; }
  .value-card-body p { font-size: 18px; }

  /* Why */
  .why-section { padding: 30px 0; }
  .why-heading { font-size: 22px; line-height: 1.3; margin-left: 0; text-align: center; }
  .why-heading br { display: none; }
  .why-sub { font-size: 18px; margin-left: 0; text-align: center; }
  .why-list { padding-left: 40px; }
  .why-item { min-height: 70px; padding: 14px 16px 14px 44px; border-radius: 12px; }
  .why-item p { font-size: 18px; line-height: 1.4; }
  .why-item-icon { left: -30px; width: 60px; height: 60px; }
  .why-item-icon .why-icon-bg { width: 70px; height: 70px; }
  .why-item-icon .why-icon-svg { width: 28px; height: 28px; }
  .why-steps { flex-wrap: nowrap; gap: 10px; justify-content: center; }
  .why-step-divider { display: block; }
  .why-step h4 { font-size: 12px; }
  .why-step p { font-size: 8px; }
  .why-quote { padding: 16px; border-radius: 16px; }
  .why-quote p { font-size: 18px; line-height: 1.5; }

  /* Testimonial */
  .testimonial-section { padding: 30px 0; }
  .testimonial-label {
    font-size: 16px; height: auto; padding: 10px 40px; white-space: normal; line-height: 1.3;
  }
  .testimonial-grid { grid-template-columns: 1fr; gap: 16px; }
  .testimonial-name { font-size: 20px; }
  .testimonial-text { font-size: 16px; line-height: 1.5; }

  /* Promo */
  .promo-section { padding-top: 40px; }
  .promo-eyebrow { font-size: 26px; -webkit-text-stroke: 2px #C8952E; }
  .promo-heading { font-size: 28px; }
  .promo-heading .text-white { font-size: 22px; }
  .promo-discount-price { grid-template-columns: 1fr 1fr; gap: 8px; }
  .promo-bonus-row { grid-template-columns: 1fr 1fr; }
  .promo-features { grid-template-columns: 1fr 1fr; }
  .promo-discount-text { font-size: 26px; -webkit-text-stroke: 2px #C8952E; }
  .promo-price-new { font-size: 26px; }
  .promo-bonus-text { font-size: 16px; }
  .promo-feature-title { font-size: 15px; }
  .promo-feature-desc { font-size: 15px; }
  .promo-community-text { font-size: 15px; }
  .promo-form-title { font-size: 20px; }
}

/* --- 480px (mobile nhỏ) --- */
@media (max-width: 480px) {
  /* Header */
  .header { height: 56px; }
  .header-logo img { height: 32px; }
  .btn-buy { font-size: 13px; width: 100px; height: 32px; line-height: 32px; }

  /* Hero */
  .hero-combo-tag { font-size: 20px; top: 12px; -webkit-text-stroke: 1.5px #C8952E; }
  .combo-desc { font-size: 13px; padding: 10px 12px; }

  /* Intro */
  .intro-section::before { height: 80px; }
  .intro-section::after { height: 80px; }
  .intro-section .container { padding: 16px 12px 32px; }
  .pillars-grid { gap: 10px; }
  .pillar-card { padding: 12px; gap: 10px; }
  .pillar-icon { width: 25px; height: 25px; }
  .pillar-card p { font-size: 14px; }

  /* Target */
  .target-grid { grid-template-columns: repeat(2, 1fr); max-width: 100%; }
  .target-card { min-height: 200px; }

  /* Thinking */
  .thinking-heading { font-size: 22px; }

  /* Stats */
  .stats-heading { font-size: 22px; }
  .stats-grid { gap: 20px; }
  .stat-item { width: 100%; }
  .stat-item img { height: 48px; }
  .stat-item p { font-size: 16px; }

  /* Success */
  .success-heading { font-size: 22px; }
  .success-slides img { flex: 0 0 calc(100% - 0px); }

  /* Value */
  .value-heading span:last-child { font-size: 22px; }
  .value-subheading { font-size: 22px; }
  .value-index { font-size: 34px; }
  .value-title { font-size: 13px; }
  .value-card-body { padding: 12px; gap: 10px; }
  .value-card-body p { font-size: 15px; }
  .value-icon { width: 45px; height: 45px; }

  /* Why */
  .why-heading { font-size: 22px; }
  .why-list { padding-left: 36px; }
  .why-item { padding: 12px 12px 12px 38px; }
  .why-item p { font-size: 15px; }
  .why-item-icon { left: -38px; width: 80px; height: 80px; }
  .why-item-icon .why-icon-bg { width: 80px; height: 80px; top: 50%; left: 50%; transform: translate(-50%, -50%); }
  .why-item-icon .why-icon-svg { width: 36px; height: 36px; }
  .why-step h4 { font-size: 20px; }
  .why-step p { font-size: 15px; }
  .why-quote p { font-size: 15px; }

  /* Testimonial */
  .testimonial-name { font-size: 18px; }
  .testimonial-text { font-size: 14px; }

  /* Promo */
  .promo-eyebrow { font-size: 20px; padding-left: 15px;}
  .promo-heading { font-size: 22px; }
  .promo-heading .text-white { font-size: 22px; }
  .promo-discount-text { font-size: 22px; }
  .promo-price-new { font-size: 22px; }
  .timer-box { width: 44px; height: 40px; font-size: 18px; }
  .promo-form-box { padding: 16px 12px; }
  .promo-form-title { font-size: 16px; }
  .promo-form input, .promo-form select { font-size: 14px; height: 36px; border-radius: 8px; }
  .promo-form-row input { width: 120px; }
  .promo-total { font-size: 14px; }
  .promo-btn-submit { font-size: 14px; height: 40px; }
}