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

:root {
  --purple-dark: #1a0a3c;
  --purple-mid: #2d1166;
  --purple-light: #6b21a8;
  --yellow: #f5c518;
  --yellow-hover: #e6b800;
  --white: #ffffff;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-400: #9ca3af;
  --gray-600: #4b5563;
  --text-dark: #111827;
  --font: 'Be Vietnam Pro', sans-serif;
}

html { scroll-behavior: smooth; }
body { font-family: var(--font); background: #0f0720; color: var(--white); overflow-x: hidden; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }

/* BUTTONS */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px; border-radius: 50px; font-family: var(--font); font-weight: 700; font-size: 15px; cursor: pointer; text-decoration: none; transition: all .25s; border: none; }
.btn-primary { background: var(--purple-light); color: #fff; }
.btn-primary:hover { background: #7c3aed; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(107,33,168,.5); }
.btn-yellow { background: var(--yellow); color: #1a0a3c; }
.btn-yellow:hover { background: var(--yellow-hover); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,197,24,.4); }
.btn-full { width: 100%; justify-content: center; }
.btn-lg { padding: 16px 40px; font-size: 17px; }

/* NAVBAR */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 100; padding: 16px 0; transition: background .3s, backdrop-filter .3s; }
.navbar.scrolled { background: rgba(15,7,32,.9); backdrop-filter: blur(12px); border-bottom: 1px solid rgba(255,255,255,.08); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.logo { text-decoration: none; font-size: 26px; font-weight: 900; letter-spacing: -1px; }
.logo-im { color: var(--yellow); }
.logo-group { color: var(--white); }

/* HERO */
.hero { min-height: 100vh; display: flex; align-items: center; padding-top: 80px; position: relative; overflow: hidden; background: linear-gradient(135deg, #0f0720 0%, #1a0a3c 50%, #0f0720 100%); }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 2; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2); border-radius: 50px; padding: 8px 18px; font-size: 13px; color: var(--gray-200); margin-bottom: 24px; backdrop-filter: blur(8px); }
.hero-title { font-size: 64px; font-weight: 900; line-height: 1.05; letter-spacing: -2px; margin-bottom: 8px; }
.highlight { color: var(--yellow); }
.hero-subtitle { font-size: 28px; font-weight: 700; color: var(--gray-200); margin-bottom: 20px; }
.hero-desc { font-size: 16px; line-height: 1.7; color: #c4b5d8; max-width: 480px; margin-bottom: 36px; }
.hero-cta { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.price-box { background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15); border-radius: 16px; padding: 12px 20px; }
.price-label { display: block; font-size: 11px; color: var(--gray-400); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 2px; }
.price-amount { font-size: 26px; font-weight: 900; color: var(--white); }

/* HERO IMAGE */
.hero-image { position: relative; display: flex; justify-content: center; }
.hero-img-wrap { width: 100%; max-width: 420px; height: 480px; border-radius: 24px; overflow: hidden; background: linear-gradient(160deg, #2d1166 0%, #1a0a3c 100%); position: relative; display: flex; align-items: center; justify-content: center; border: 1px solid rgba(255,255,255,.1); }
.instructor-img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.instructor-placeholder { text-align: center; color: var(--gray-400); display: none; }
.placeholder-avatar { font-size: 80px; margin-bottom: 12px; }
.instructor-placeholder p { font-size: 16px; line-height: 1.5; }
.hero-img-wrap.no-img .instructor-placeholder { display: block; }
.floating-card { position: absolute; background: rgba(255,255,255,.12); backdrop-filter: blur(16px); border: 1px solid rgba(255,255,255,.2); border-radius: 16px; padding: 12px 16px; display: flex; align-items: center; gap: 12px; z-index: 3; animation: float 3s ease-in-out infinite; }
.card-top-right { top: 20px; right: -20px; }
.card-bottom-left { bottom: 40px; left: -20px; animation-delay: 1.5s; }
.card-icon { font-size: 24px; background: var(--yellow); border-radius: 10px; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; }
.card-text strong { display: block; font-size: 14px; color: #fff; }
.card-text span { font-size: 12px; color: var(--gray-400); }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* GRADIENT BLOBS */
.hero-gradient-blob { position: absolute; border-radius: 50%; filter: blur(80px); opacity: .35; pointer-events: none; }
.blob1 { width: 600px; height: 600px; background: radial-gradient(circle, #6b21a8, transparent); top: -200px; left: -200px; }
.blob2 { width: 500px; height: 500px; background: radial-gradient(circle, #f5c518, transparent); bottom: -150px; right: -100px; opacity: .12; }
.blob3 { width: 400px; height: 400px; background: radial-gradient(circle, #f5c518, transparent); bottom: -100px; right: 0; opacity: .15; }

/* SECTION HEADERS */
.section-tag { display: inline-block; background: rgba(245,197,24,.15); color: var(--yellow); border: 1px solid rgba(245,197,24,.3); border-radius: 50px; padding: 6px 16px; font-size: 13px; font-weight: 600; margin-bottom: 16px; }
.section-title { font-size: 38px; font-weight: 800; line-height: 1.2; margin-bottom: 48px; }

/* PAIN SECTION */
.pain-section { background: #0a0418; }
.pain-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.pain-card { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08); border-radius: 20px; padding: 28px; transition: transform .3s, border-color .3s; }
.pain-card:hover { transform: translateY(-4px); border-color: rgba(107,33,168,.5); }
.pain-icon { font-size: 36px; margin-bottom: 14px; }
.pain-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; color: #fff; }
.pain-card p { font-size: 14px; line-height: 1.7; color: #c4b5d8; }

/* PROMISE SECTION */
.promise-section { background: #0f0720; }
.promise-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.promise-item { background: rgba(245,197,24,.06); border: 1px solid rgba(245,197,24,.15); border-radius: 16px; padding: 24px; display: flex; flex-direction: column; gap: 12px; transition: transform .3s; }
.promise-item:hover { transform: translateY(-4px); border-color: rgba(245,197,24,.4); }
.promise-icon { font-size: 32px; }
.promise-item p { font-size: 14px; line-height: 1.6; color: #d1c5e8; }
.promise-item strong { color: #fff; }

/* CURRICULUM */
.curriculum-section { background: #0a0418; }
.curriculum-list { display: flex; flex-direction: column; gap: 16px; }
.curriculum-item { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08); border-radius: 20px; overflow: hidden; transition: border-color .3s; }
.curriculum-item:hover { border-color: rgba(107,33,168,.4); }
.curriculum-header { display: flex; align-items: center; gap: 20px; padding: 24px 28px; cursor: pointer; }
.part-label { background: var(--purple-light); color: #fff; border-radius: 50px; padding: 4px 14px; font-size: 12px; font-weight: 700; white-space: nowrap; }
.part-info { flex: 1; }
.part-info h3 { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.part-goal { font-size: 13px; color: var(--yellow); }
.part-toggle { font-size: 14px; color: var(--gray-400); transition: transform .3s; }
.curriculum-item.open .part-toggle { transform: rotate(180deg); }
.curriculum-body { display: none; padding: 0 28px 24px; border-top: 1px solid rgba(255,255,255,.06); padding-top: 20px; }
.curriculum-item.open .curriculum-body { display: block; }
.curriculum-body ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.curriculum-body li { font-size: 15px; color: #d1c5e8; display: flex; gap: 10px; }

/* INSTRUCTOR */
.instructor-section { background: #0f0720; }
.instructor-card { display: grid; grid-template-columns: auto 1fr; gap: 48px; align-items: start; background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08); border-radius: 28px; padding: 40px; }
.instructor-avatar { width: 160px; height: 160px; border-radius: 50%; overflow: hidden; background: linear-gradient(135deg, #2d1166, #6b21a8); display: flex; align-items: center; justify-content: center; border: 3px solid rgba(245,197,24,.4); flex-shrink: 0; }
.instructor-avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.avatar-fallback { font-size: 64px; display: none; }
.instructor-avatar.no-img .avatar-fallback { display: block; }
.instructor-name { font-size: 26px; font-weight: 800; margin-bottom: 6px; }
.instructor-title { font-size: 14px; color: var(--yellow); margin-bottom: 16px; }
.instructor-bio p { font-size: 15px; line-height: 1.7; color: #c4b5d8; margin-bottom: 12px; }
.instructor-bio strong { color: #fff; }
.instructor-stats { display: flex; gap: 32px; margin-top: 24px; }
.stat { text-align: center; }
.stat strong { display: block; font-size: 28px; font-weight: 900; color: var(--yellow); }
.stat span { font-size: 13px; color: var(--gray-400); }

/* GALLERY */
.gallery-section { background: #0a0418; }
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.gallery-item { border-radius: 16px; overflow: hidden; height: 240px; border: 1px solid rgba(255,255,255,.1); }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s; }
.gallery-item:hover img { transform: scale(1.05); }

/* PRICING */
.pricing-section { background: #0f0720; }
.pricing-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
.pricing-card { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.1); border-radius: 28px; padding: 36px; position: relative; }
.pricing-card.featured { border-color: var(--yellow); background: rgba(245,197,24,.06); }
.pricing-badge { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--yellow); color: #1a0a3c; font-weight: 800; font-size: 12px; padding: 4px 16px; border-radius: 50px; white-space: nowrap; }
.pricing-name { font-size: 20px; font-weight: 700; margin-bottom: 12px; margin-top: 8px; }
.pricing-price { font-size: 52px; font-weight: 900; color: var(--yellow); margin-bottom: 8px; }
.pricing-price span { font-size: 24px; }
.pricing-date { font-size: 14px; color: var(--gray-400); margin-bottom: 24px; }
.pricing-features { list-style: none; margin-bottom: 28px; display: flex; flex-direction: column; gap: 12px; }
.pricing-features li { font-size: 15px; color: #d1c5e8; }
.pricing-note { font-size: 12px; color: var(--gray-400); text-align: center; margin-top: 12px; }
.pricing-info-box { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08); border-radius: 28px; padding: 36px; }
.pricing-info-box h3 { font-size: 20px; font-weight: 700; margin-bottom: 24px; }
.info-row { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 20px; }
.info-icon { font-size: 24px; flex-shrink: 0; }
.info-row strong { display: block; font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.info-row p { font-size: 14px; color: #c4b5d8; line-height: 1.5; }
.info-row strong { color: #fff; }
.slots-warning { background: rgba(245,197,24,.15); border: 1px solid rgba(245,197,24,.4); border-radius: 12px; padding: 14px 18px; font-size: 14px; color: var(--yellow); text-align: center; margin-top: 8px; }
.slots-warning strong { color: #fff; }

/* FAQ */
.faq-section { background: #0f0720; }
.faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 780px; }
.faq-item { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08); border-radius: 16px; overflow: hidden; }
.faq-question { display: flex; justify-content: space-between; align-items: center; padding: 20px 24px; cursor: pointer; font-size: 16px; font-weight: 600; transition: color .2s; }
.faq-question:hover { color: var(--yellow); }
.faq-arrow { font-size: 13px; color: var(--gray-400); transition: transform .3s; flex-shrink: 0; margin-left: 12px; }
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-answer { display: none; padding: 0 24px 20px; }
.faq-item.open .faq-answer { display: block; }
.faq-answer p { font-size: 15px; line-height: 1.7; color: #c4b5d8; }
.faq-answer strong { color: #fff; }

/* FINAL CTA */
.final-cta { background: linear-gradient(135deg, #1a0a3c 0%, #0f0720 100%); text-align: center; position: relative; overflow: hidden; }
.final-cta-inner { position: relative; z-index: 2; }
.final-cta h2 { font-size: 42px; font-weight: 900; line-height: 1.2; margin-bottom: 16px; }
.final-cta > .container > .final-cta-inner > p { font-size: 18px; color: #c4b5d8; margin-bottom: 40px; }
.final-cta-actions { display: flex; align-items: center; justify-content: center; gap: 24px; flex-wrap: wrap; margin-bottom: 20px; }
.price-box-light { background: rgba(255,255,255,.1); }
.final-note { font-size: 14px; color: var(--gray-400); }

/* FOOTER */
.footer { background: #060210; padding: 40px 0; border-top: 1px solid rgba(255,255,255,.06); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer p { font-size: 13px; color: var(--gray-400); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: 13px; color: var(--gray-400); text-decoration: none; transition: color .2s; }
.footer-links a:hover { color: var(--yellow); }

/* ZALO STICKY */
.zalo-sticky { position: fixed; bottom: 24px; right: 24px; z-index: 200; width: 56px; height: 56px; border-radius: 50%; background: #0068ff; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 20px rgba(0,104,255,.5); transition: transform .3s; }
.zalo-sticky:hover { transform: scale(1.1); }
.zalo-sticky img { width: 36px; height: 36px; }

/* RESPONSIVE */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-title { font-size: 44px; }
  .hero-subtitle { font-size: 22px; }
  .hero-image { display: none; }
  .hero-desc { margin: 0 auto 36px; }
  .hero-cta { justify-content: center; }
  .pain-grid { grid-template-columns: 1fr; }
  .promise-grid { grid-template-columns: repeat(2,1fr); }
  .pricing-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .instructor-card { grid-template-columns: 1fr; text-align: center; }
  .instructor-avatar { margin: 0 auto; }
  .instructor-stats { justify-content: center; }
  .section-title { font-size: 28px; }
}

@media (max-width: 600px) {
  .promise-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 36px; }
  .final-cta h2 { font-size: 28px; }
}