/*
 * =======================================================================
 * HỆ THỐNG GIAO DIỆN HIỆN ĐẠI - CÔ GIÁO VÂN NGUYỄN (vannguyen.life)
 * Tinh Bột Nghệ Nếp & Tinh Dầu Sả Java Mường Tè - Lai Châu
 * =======================================================================
 */

@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,400;1,600&family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400&family=Playfair+Display:ital,wght@0,600;0,700;1,600&display=swap&subset=vietnamese');

:root {
  /* Turmeric Gold & Warm Highland Tones */
  --color-gold-50: #fffbeb;
  --color-gold-100: #fef3c7;
  --color-gold-200: #fde68a;
  --color-gold-400: #fbbf24;
  --color-gold-500: #f59e0b;
  --color-gold-600: #d97706;
  --color-gold-700: #b45309;
  --color-gold-800: #92400e;

  /* Lemongrass & Highland Forest Green */
  --color-green-50: #f0fdf4;
  --color-green-100: #dcfce7;
  --color-green-500: #22c55e;
  --color-green-600: #16a34a;
  --color-green-700: #15803d;
  --color-green-800: #166534;
  --color-forest: #064e3b;

  /* Neutrals & Slate */
  --color-dark: #0f172a;
  --color-slate-800: #1e293b;
  --color-slate-700: #334155;
  --color-slate-600: #475569;
  --color-slate-500: #64748b;
  --color-slate-200: #e2e8f0;
  --color-slate-100: #f1f5f9;
  --color-bg-light: #fafaf9;
  --color-white: #ffffff;

  /* Typography chuẩn tiếng Việt */
  --font-main: 'Be Vietnam Pro', 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Be Vietnam Pro', 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;

  /* Elevation Shadows */
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 25px -5px rgba(217, 119, 6, 0.15), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 20px 35px -5px rgba(15, 23, 42, 0.12), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
  --shadow-glow-gold: 0 0 25px rgba(245, 158, 11, 0.35);

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--color-bg-light);
  color: var(--color-slate-700);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-gold-700);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--color-gold-600);
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  color: var(--color-dark);
  line-height: 1.25;
}

/* Utility Containers */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.text-center { text-align: center; }
.text-serif { font-family: var(--font-serif); }

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

@media (max-width: 768px) {
  .section-padding { padding: 50px 0; }
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: var(--color-gold-100);
  color: var(--color-gold-800);
  border: 1px solid var(--color-gold-200);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--color-dark);
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--color-slate-600);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 48px;
}

@media (max-width: 768px) {
  .section-title { font-size: 1.8rem; }
  .section-subtitle { font-size: 1rem; margin-bottom: 32px; }
}

/* =======================================================================
   1. TOP NOTIFICATION BAR & HEADER
   ======================================================================= */
.top-notice-bar {
  background: linear-gradient(90deg, #92400e, #d97706, #064e3b);
  color: #ffffff;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 16px;
  text-align: center;
}

.top-notice-bar a {
  color: var(--color-gold-200);
  font-weight: 700;
  text-decoration: underline;
  margin-left: 6px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: var(--transition);
}

.site-header.header-scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 2px solid var(--color-gold-500);
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.logo-text-box {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-dark);
  letter-spacing: -0.3px;
}

.logo-sub {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-gold-700);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-slate-700);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover {
  color: var(--color-gold-700);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-gold-600);
  transition: var(--transition);
}

.nav-link:hover::after {
  width: 100%;
}

.header-cta-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #d97706, #b45309);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(217, 119, 6, 0.45);
}

.btn-secondary {
  background: var(--color-gold-50);
  color: var(--color-gold-800);
  border: 1px solid var(--color-gold-300, #fde68a);
}

.btn-secondary:hover {
  background: var(--color-gold-100);
  transform: translateY(-1px);
}

.btn-outline-white {
  background: transparent;
  color: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.7);
}

.btn-outline-white:hover {
  background: #ffffff;
  color: var(--color-dark);
}

.btn-zalo {
  background: #0068ff;
  color: #ffffff;
}

.btn-zalo:hover {
  background: #0056d6;
  color: #ffffff;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-dark);
}

@media (max-width: 991px) {
  .mobile-menu-btn { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    padding: 24px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    border-bottom: 1px solid var(--color-slate-200);
  }
  .main-nav.nav-open { display: flex; }
  .header-cta-group .btn-secondary { display: none; }
}

/* =======================================================================
   2. HERO SECTION
   ======================================================================= */
.hero-section {
  position: relative;
  background: radial-gradient(circle at 80% 20%, rgba(254, 243, 199, 0.6), transparent 50%),
              radial-gradient(circle at 10% 80%, rgba(220, 252, 231, 0.5), transparent 50%),
              #fafaf9;
  padding: 70px 0 90px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-badge-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.hero-badge-wrap .badge-green {
  background: var(--color-green-100);
  color: var(--color-green-800);
  border: 1px solid var(--color-green-200, #bbf7d0);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: var(--radius-full);
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1.18;
  margin-bottom: 20px;
}

.hero-title .highlight-gold {
  color: var(--color-gold-600);
  background: linear-gradient(135deg, #d97706, #f59e0b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--color-slate-600);
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-trust-points {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 36px;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-slate-800);
}

.trust-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--color-gold-100);
  color: var(--color-gold-700);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

/* Hero Media Column */
.hero-media-wrap {
  position: relative;
}

.hero-card-featured {
  position: relative;
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(226, 232, 240, 0.8);
}

.hero-main-img {
  width: 100%;
  border-radius: var(--radius-md);
  object-fit: cover;
  aspect-ratio: 4/3;
}

.hero-floating-badge {
  position: absolute;
  bottom: -20px;
  left: 20px;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  padding: 14px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--color-gold-200);
}

.badge-pulse-icon {
  font-size: 1.8rem;
}

.badge-meta h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-dark);
}

.badge-meta p {
  font-size: 0.8rem;
  color: var(--color-slate-500);
}

.hero-floating-origin {
  position: absolute;
  top: 20px;
  right: -15px;
  background: linear-gradient(135deg, #064e3b, #047857);
  color: #ffffff;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(6, 78, 59, 0.3);
}

@media (max-width: 991px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 2.3rem; }
  .hero-floating-origin { right: 10px; }
}

/* =======================================================================
   3. STORY SECTION (CÔ GIÁO VÂN NGUYỄN & RẺO CAO MƯỜNG TÈ)
   ======================================================================= */
.story-section {
  background: #ffffff;
  position: relative;
}

.story-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 56px;
  align-items: center;
}

.story-visual-stack {
  position: relative;
}

.story-illustration {
  width: 85%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 4px solid var(--color-gold-100);
}

.story-avatar-overlay {
  position: absolute;
  bottom: -30px;
  right: 0;
  width: 170px;
  height: 170px;
  border-radius: var(--radius-full);
  border: 5px solid #ffffff;
  object-fit: cover;
  box-shadow: var(--shadow-xl);
}

.story-content h2 {
  font-size: 2.2rem;
  margin-bottom: 20px;
  color: var(--color-dark);
}

.story-quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.25rem;
  color: var(--color-gold-800);
  background: var(--color-gold-50);
  border-left: 4px solid var(--color-gold-600);
  padding: 18px 24px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 24px;
  line-height: 1.6;
}

.story-text {
  font-size: 1.05rem;
  color: var(--color-slate-600);
  margin-bottom: 18px;
}

.teacher-credentials {
  display: flex;
  gap: 24px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-slate-200);
}

.cred-box h3 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-gold-700);
}

.cred-box p {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-slate-600);
}

@media (max-width: 991px) {
  .story-grid { grid-template-columns: 1fr; gap: 40px; }
  .story-illustration { width: 100%; }
  .story-avatar-overlay { width: 130px; height: 130px; bottom: -20px; }
}

/* Video Showcase Section */
.video-showcase-box {
  margin-top: 48px;
  background: var(--color-slate-800);
  border-radius: var(--radius-lg);
  padding: 24px;
  color: #ffffff;
}

.video-box-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.video-box-header h3 {
  color: #ffffff;
  font-size: 1.3rem;
}

.story-video-player {
  width: 100%;
  max-height: 480px;
  border-radius: var(--radius-md);
  background: #000;
  box-shadow: 0 8px 30px rgba(0,0,0,0.4);
}

/* =======================================================================
   4. PRODUCT HIGHLIGHT: TINH BỘT NGHỆ NẾP MƯỜNG TÈ
   ======================================================================= */
.product-section {
  background: var(--color-bg-light);
}

.product-detail-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(226, 232, 240, 0.8);
  margin-bottom: 48px;
}

.product-card-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 48px;
  align-items: center;
}

.product-gallery {
  position: relative;
}

.product-img-main {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-slate-200);
}

.product-badges-overlay {
  position: absolute;
  top: 16px;
  left: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pill-badge {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(6px);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: var(--radius-full);
}

.pill-badge.gold {
  background: linear-gradient(135deg, #d97706, #f59e0b);
}

.product-info-wrap h3 {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.product-tagline {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-gold-700);
  margin-bottom: 20px;
}

.product-benefits-list {
  list-style: none;
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.product-benefits-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.98rem;
  color: var(--color-slate-700);
}

.benefit-check {
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  background: var(--color-green-100);
  color: var(--color-green-700);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.8rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.product-pricing-box {
  background: var(--color-gold-50);
  border: 1px solid var(--color-gold-200);
  border-radius: var(--radius-md);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.price-main {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-gold-800);
}

.price-unit {
  font-size: 0.9rem;
  color: var(--color-slate-500);
  font-weight: 500;
}

@media (max-width: 991px) {
  .product-card-grid { grid-template-columns: 1fr; }
  .product-detail-card { padding: 24px; }
}

/* =======================================================================
   5. INTERACTIVE DOSAGE & REGIMEN CALCULATOR
   ======================================================================= */
.calculator-section {
  background: linear-gradient(135deg, #064e3b, #0f172a);
  color: #ffffff;
  position: relative;
  overflow: hidden;
}

.calculator-section .section-title {
  color: #ffffff;
}

.calculator-section .section-subtitle {
  color: rgba(255, 255, 255, 0.8);
}

.calculator-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
}

.calc-control-group {
  margin-bottom: 24px;
}

.calc-label {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-gold-400);
  margin-bottom: 8px;
}

.calc-select, .calc-input {
  width: 100%;
  padding: 14px 18px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  color: #ffffff;
  font-size: 1rem;
  font-family: var(--font-main);
  outline: none;
  transition: var(--transition);
}

.calc-select option {
  background: var(--color-slate-800);
  color: #ffffff;
}

.calc-select:focus, .calc-input:focus {
  border-color: var(--color-gold-400);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.3);
}

/* Regimen Result Display Box */
.calc-result-box {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-md);
  padding: 28px;
}

.result-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 14px;
}

.result-header h3 {
  color: var(--color-gold-400);
  font-size: 1.3rem;
}

.regimen-item {
  margin-bottom: 16px;
}

.regimen-item-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.regimen-item-val {
  font-size: 1.05rem;
  color: #ffffff;
  font-weight: 500;
  line-height: 1.5;
}

@media (max-width: 991px) {
  .calc-grid { grid-template-columns: 1fr; }
  .calculator-card { padding: 24px; }
}

/* =======================================================================
   6. COMPARISON TABLE SECTION
   ======================================================================= */
.comparison-section {
  background: #ffffff;
}

.comparison-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-slate-200);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  background: #ffffff;
}

.comparison-table th, .comparison-table td {
  padding: 18px 24px;
  border-bottom: 1px solid var(--color-slate-200);
}

.comparison-table th {
  background: var(--color-slate-100);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-dark);
}

.comparison-table th.highlight-col, .comparison-table td.highlight-col {
  background: var(--color-gold-50);
  border-left: 2px solid var(--color-gold-400);
  border-right: 2px solid var(--color-gold-400);
}

.comparison-table th.highlight-col {
  background: var(--color-gold-100);
  color: var(--color-gold-900, #78350f);
}

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

/* =======================================================================
   7. ORDER SECTION (ĐẶT HÀNG TRỰC TUYẾN THÔNG MINH)
   ======================================================================= */
.order-section {
  background: radial-gradient(circle at 50% 10%, #fffbeb, #fafaf9);
}

.order-wrapper {
  max-width: 860px;
  margin: 0 auto;
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-gold-200);
}

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

.form-group-full {
  grid-column: 1 / -1;
}

.form-label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-slate-700);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-slate-300, #cbd5e1);
  border-radius: var(--radius-md);
  font-family: var(--font-main);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--color-gold-500);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

.order-price-summary {
  background: var(--color-slate-50, #f8fafc);
  border-radius: var(--radius-md);
  padding: 20px;
  margin: 24px 0;
  border: 1px dashed var(--color-slate-300);
}

.price-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  font-size: 0.95rem;
}

.price-row.total-row {
  border-top: 1px solid var(--color-slate-200);
  padding-top: 12px;
  margin-top: 12px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-gold-800);
}

.order-guarantee-badges {
  display: flex;
  justify-content: space-around;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--color-slate-200);
}

.guarantee-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-slate-600);
}

/* Alert Box */
.order-success-box {
  display: none;
  background: var(--color-green-50);
  border: 2px solid var(--color-green-500);
  border-radius: var(--radius-md);
  padding: 30px;
  margin-bottom: 24px;
}

.order-alert-content {
  text-align: center;
}

.order-alert-content .alert-icon {
  font-size: 3rem;
  margin-bottom: 8px;
}

.order-alert-content h3 {
  font-size: 1.6rem;
  color: var(--color-green-800);
  margin-bottom: 12px;
}

.order-summary-box {
  background: #ffffff;
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  text-align: left;
  margin: 16px 0;
  border: 1px solid var(--color-green-200);
}

.order-cta-group {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
}

@media (max-width: 768px) {
  .order-wrapper { padding: 24px; }
  .order-form-grid { grid-template-columns: 1fr; }
}

/* =======================================================================
   8. FAQ ACCORDION SECTION
   ======================================================================= */
.faq-section {
  background: #ffffff;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--color-gold-400);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--color-gold-600);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 24px 20px;
  color: var(--color-slate-600);
  font-size: 0.98rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

/* =======================================================================
   9. FOOTER
   ======================================================================= */
.site-footer {
  background: var(--color-dark);
  color: var(--color-slate-400, #94a3b8);
  padding: 70px 0 30px;
  border-top: 4px solid var(--color-gold-600);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  color: #ffffff;
  font-size: 1.4rem;
  margin-bottom: 14px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: 18px;
}

.footer-contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.85rem;
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* =======================================================================
   10. AI CONSULTATION CHAT WIDGET & FAB LAUNCHER (TÂM HUYẾT CÔ GIÁO VÂN NGUYỄN)
   ======================================================================= */
.vn-fab-launcher {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 12px;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border: 1.5px solid var(--color-gold-500);
  padding: 8px 18px 8px 10px;
  border-radius: var(--radius-full);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3), var(--shadow-glow-gold);
  cursor: pointer;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease;
  user-select: none;
}

.vn-fab-launcher:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.4), 0 0 30px rgba(245, 158, 11, 0.5);
}

.vn-fab-launcher.chat-open {
  transform: scale(0.9);
  opacity: 0.8;
}

.vn-fab-avatar-wrap {
  position: relative;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

.vn-fab-pulse {
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  border-radius: 50%;
  background: var(--color-gold-500);
  opacity: 0.4;
  animation: fabPulse 2s infinite cubic-bezier(0.4, 0, 0.6, 1);
}

@keyframes fabPulse {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.25); opacity: 0; }
  100% { transform: scale(0.95); opacity: 0; }
}

.vn-fab-avatar {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-gold-400);
  position: relative;
  z-index: 2;
}

.vn-fab-online-dot {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 12px;
  height: 12px;
  background: #22c55e;
  border: 2px solid #0f172a;
  border-radius: 50%;
  z-index: 3;
}

.vn-fab-text {
  display: flex;
  flex-direction: column;
}

.vn-fab-title {
  color: #ffffff;
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: -0.2px;
}

.vn-fab-sub {
  color: var(--color-gold-300, #fde68a);
  font-size: 0.75rem;
  font-weight: 500;
}

.vn-fab-badge {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

/* Chat Window */
.vn-chat-window {
  position: fixed;
  bottom: 95px;
  right: 24px;
  width: 420px;
  max-width: calc(100vw - 32px);
  height: 620px;
  max-height: calc(100vh - 120px);
  background: #ffffff;
  border-radius: 20px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.25), 0 0 20px rgba(245, 158, 11, 0.2);
  border: 1px solid rgba(245, 158, 11, 0.3);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 99999;
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px) scale(0.95);
  transition: all 0.3s cubic-bezier(0.34, 1.3, 0.64, 1);
}

.vn-chat-window.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

/* Chat Header */
.vn-chat-header {
  background: linear-gradient(135deg, #0f172a, #1e293b);
  border-bottom: 2px solid var(--color-gold-500);
  color: #ffffff;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.vn-chat-profile {
  display: flex;
  align-items: center;
  gap: 12px;
}

.vn-chat-avatar-box {
  position: relative;
  width: 42px;
  height: 42px;
}

.vn-chat-avatar-box img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-gold-400);
}

.vn-online-status {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 11px;
  height: 11px;
  background: #22c55e;
  border: 2px solid #0f172a;
  border-radius: 50%;
}

.vn-chat-meta {
  display: flex;
  flex-direction: column;
}

.vn-chat-name {
  font-weight: 800;
  font-size: 1rem;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 5px;
}

.vn-verified-badge {
  background: var(--color-gold-500);
  color: #ffffff;
  font-size: 0.65rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
}

.vn-chat-sub {
  font-size: 0.72rem;
  color: var(--color-gold-200);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
}

.vn-chat-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.vn-action-btn {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #ffffff;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.vn-action-btn:hover {
  background: var(--color-gold-600);
  color: #ffffff;
}

/* Suggestion Chips Bar */
.vn-chat-chips-bar {
  background: var(--color-gold-50);
  border-bottom: 1px solid var(--color-gold-200);
  padding: 8px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.vn-chips-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-gold-800);
  white-space: nowrap;
}

.vn-chips-scroll {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.vn-chips-scroll::-webkit-scrollbar { display: none; }

.vn-chip-btn {
  background: #ffffff;
  border: 1px solid var(--color-gold-300, #fde68a);
  color: var(--color-slate-700);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: var(--transition);
}

.vn-chip-btn:hover {
  background: var(--color-gold-500);
  color: #ffffff;
  border-color: var(--color-gold-500);
}

/* Chat Body */
.vn-chat-body {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  background: #f8fafc;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.vn-msg {
  display: flex;
  gap: 10px;
  max-width: 86%;
}

.vn-msg.bot {
  align-self: flex-start;
}

.vn-msg.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.vn-msg-avatar {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.vn-msg-avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 1.5px solid var(--color-gold-400);
}

.vn-msg-bubble {
  background: #ffffff;
  border: 1px solid var(--color-slate-200);
  padding: 12px 16px;
  border-radius: 16px 16px 16px 4px;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--color-slate-800);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  position: relative;
}

.vn-msg.user .vn-msg-bubble {
  background: linear-gradient(135deg, #d97706, #b45309);
  color: #ffffff;
  border: none;
  border-radius: 16px 16px 4px 16px;
}

.vn-msg-bubble strong {
  color: var(--color-gold-800);
}

.vn-msg.user .vn-msg-bubble strong {
  color: #fef3c7;
}

.vn-msg-bubble ul, .vn-msg-bubble ol {
  margin: 8px 0 8px 20px;
}

.vn-msg-time {
  font-size: 0.65rem;
  color: var(--color-slate-400);
  margin-top: 4px;
  text-align: right;
}

.vn-msg.user .vn-msg-time {
  color: rgba(255, 255, 255, 0.7);
}

/* Typing Dots Animation */
.vn-typing-dots {
  display: flex;
  gap: 4px;
  padding: 6px 4px;
}

.vn-typing-dots span {
  width: 7px;
  height: 7px;
  background: var(--color-gold-600);
  border-radius: 50%;
  animation: typingBlink 1.4s infinite ease-in-out both;
}

.vn-typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.vn-typing-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes typingBlink {
  0%, 80%, 100% { transform: scale(0); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}

/* Chat Footer */
.vn-chat-footer {
  background: #ffffff;
  border-top: 1px solid var(--color-slate-200);
  padding: 12px 14px 8px;
}

.vn-chat-form {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-slate-100);
  border: 1px solid var(--color-slate-300);
  border-radius: var(--radius-full);
  padding: 4px 8px 4px 14px;
  transition: var(--transition);
}

.vn-chat-form:focus-within {
  border-color: var(--color-gold-500);
  background: #ffffff;
  box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.2);
}

.vn-chat-input {
  flex: 1;
  background: transparent;
  border: none;
  font-family: var(--font-main);
  font-size: 0.92rem;
  resize: none;
  outline: none;
  max-height: 100px;
  line-height: 1.4;
  padding: 6px 0;
}

.vn-send-btn {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  border: none;
  color: #ffffff;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: var(--transition);
}

.vn-send-btn:hover {
  transform: scale(1.08);
}

.vn-footer-note {
  text-align: center;
  font-size: 0.7rem;
  color: var(--color-slate-500);
  margin-top: 6px;
}

.vn-footer-note a {
  color: var(--color-gold-700);
  font-weight: 600;
}

@media (max-width: 480px) {
  .vn-chat-window {
    right: 12px;
    bottom: 85px;
    width: calc(100vw - 24px);
    height: calc(100vh - 100px);
  }
  .vn-fab-launcher {
    right: 12px;
    bottom: 16px;
    padding: 6px 14px 6px 8px;
  }
}

/* =======================================================================
   11. TOAST NOTIFICATIONS
   ======================================================================= */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 100000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast-item {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 12px 18px;
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-dark);
  border-left: 4px solid var(--color-gold-500);
  transform: translateX(120%);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: auto;
  max-width: 360px;
}

.toast-item.toast-show {
  transform: translateX(0);
  opacity: 1;
}

.toast-item.toast-success {
  border-left-color: #22c55e;
}

.toast-item.toast-error {
  border-left-color: #ef4444;
}