/* =============================================
   ĐƯỢM THAN BBQ – Main Stylesheet
   Color Palette:
   - Primary: #E8420A (Fire Orange)
   - Dark: #1A0A00 (Charcoal Black)
   - Accent: #F5B922 (Ember Gold)
   - Light: #FFF8F0 (Warm White)
   - Green: #2D6A4F (Eco Green)
   Font: Be Vietnam Pro
============================================= */

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Be Vietnam Pro', sans-serif;
  color: #1A0A00;
  background: #fff;
  overflow-x: hidden;
  line-height: 1.6;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { border: none; cursor: pointer; background: none; font-family: inherit; }

:root {
  --primary: #E8420A;
  --primary-dark: #C03208;
  --dark: #1A0A00;
  --dark2: #2D1500;
  --accent: #F5B922;
  --accent-light: #FFF3CC;
  --light: #FFF8F0;
  --green: #2D6A4F;
  --text-muted: #7A5C4A;
  --border: #E8D5C4;
  --radius: 16px;
  --shadow: 0 8px 32px rgba(232, 66, 10, 0.15);
  --shadow-dark: 0 16px 48px rgba(26, 10, 0, 0.2);
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===== UTILITIES ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.text-white { color: #fff !important; }
.gradient-text {
  background: linear-gradient(135deg, #F5B922, #E8420A, #FF6B35);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.highlight { color: var(--primary); }
.highlight-light { color: var(--accent); }

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.4); opacity: 0; }
}
@keyframes ticker {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
@keyframes slideShow {
  0%, 33% { opacity: 1; }
  40%, 90% { opacity: 0; }
  100% { opacity: 1; }
}
.animate-fade-up { animation: fadeUp 0.7s ease both; }
.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }
.delay-4 { animation-delay: 0.6s; }
.delay-5 { animation-delay: 0.75s; }
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: var(--transition);
  white-space: nowrap;
  cursor: pointer;
}
.btn-primary {
  background: linear-gradient(135deg, #E8420A, #FF6B35);
  color: #fff;
  box-shadow: 0 4px 20px rgba(232, 66, 10, 0.4);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #C03208, #E8420A);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(232, 66, 10, 0.5);
}
.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}
.btn-outline-dark {
  border: 2px solid var(--dark);
  color: var(--dark);
  background: transparent;
}
.btn-outline-dark:hover {
  background: var(--dark);
  color: #fff;
  transform: translateY(-2px);
}
.btn-zalo {
  background: #0068FF;
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 104, 255, 0.35);
}
.btn-zalo:hover { background: #0051CC; transform: translateY(-2px); }
.btn-zalo-outline {
  border: 2px solid #fff;
  color: #fff;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(8px);
}
.btn-zalo-outline:hover { background: rgba(255,255,255,0.3); }
.btn-white {
  background: #fff;
  color: var(--primary);
  font-weight: 800;
}
.btn-white:hover { background: #FFF3E0; transform: translateY(-2px); }
.btn--full { width: 100%; justify-content: center; }
.zalo-icon-btn { width: 22px; height: 22px; object-fit: contain; vertical-align: middle; border-radius: 4px; }

/* ===== SECTION HEADER ===== */
.section-header { text-align: center; margin-bottom: 64px; }
.section-header--light { margin-bottom: 64px; text-align: center; }
.section-label {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 6px 18px;
  border-radius: 50px;
  margin-bottom: 16px;
}
.label--light {
  background: rgba(255,255,255,0.2);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.4);
  backdrop-filter: blur(8px);
}
.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
}

/* =============================================
   NAVBAR
============================================= */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: var(--transition);
  padding: 0;
}
.navbar.scrolled {
  background: rgba(26, 10, 0, 0.97);
  backdrop-filter: blur(20px);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  max-width: 1400px;
  margin: 0 auto;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 1.3rem;
  font-weight: 900;
}
.logo-flame { font-size: 1.6rem; animation: float 3s ease infinite; }
.logo-accent { color: var(--accent); }
.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  font-weight: 600;
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.2s;
}
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-cta {
  background: linear-gradient(135deg, var(--primary), #FF6B35);
  color: #fff;
  padding: 10px 22px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.875rem;
  display: flex; align-items: center; gap: 8px;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(232, 66, 10, 0.4);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232, 66, 10, 0.5); }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.hamburger span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: var(--transition); }
.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 16px 24px 24px;
  background: rgba(26, 10, 0, 0.98);
  border-top: 1px solid rgba(255,255,255,0.1);
}
.mobile-menu a {
  color: rgba(255,255,255,0.85);
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  display: block;
}
.mobile-cta {
  background: linear-gradient(135deg, var(--primary), #FF6B35) !important;
  color: #fff !important;
  border: none !important;
  border-radius: 12px;
  padding: 14px 24px !important;
  text-align: center;
  margin-top: 12px;
  font-weight: 700;
}
.mobile-menu.open { display: flex; }
@media (max-width: 900px) {
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }
}

/* =============================================
   HERO (WITH FEATURED BURNING CHARCOAL VIDEO)
============================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: radial-gradient(circle at 80% 25%, rgba(232, 66, 10, 0.28) 0%, rgba(35, 14, 2, 0.95) 55%, #140700 100%);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-ambient-glow {
  position: absolute;
  width: 650px;
  height: 650px;
  top: 10%;
  right: 5%;
  background: radial-gradient(circle, rgba(232, 66, 10, 0.2) 0%, rgba(245, 185, 34, 0.08) 40%, transparent 70%);
  filter: blur(60px);
  animation: float 6s ease-in-out infinite alternate;
}
.hero-container {
  max-width: 1360px;
  width: 100%;
  margin: 0 auto;
  padding: 120px 24px 60px;
  position: relative;
  z-index: 2;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 48px;
  align-items: center;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 620px;
}
.hero-badge {
  display: inline-block;
  background: rgba(245, 185, 34, 0.18);
  border: 1px solid rgba(245, 185, 34, 0.45);
  color: var(--accent);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 22px;
  backdrop-filter: blur(8px);
}
.hero-title {
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.05;
  margin-bottom: 18px;
}
.hero-subtitle {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.88);
  margin-bottom: 28px;
  line-height: 1.7;
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}
.tag {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.22);
  color: #fff;
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 600;
  backdrop-filter: blur(8px);
  display: flex; align-items: center; gap: 8px;
}
.tag i { color: var(--accent); }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 40px;
}
.hero-stats {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 28px;
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 18px;
}
.stat { text-align: center; }
.stat-num { display: block; font-size: 1.4rem; font-weight: 900; color: var(--accent); }
.stat-label { font-size: 0.78rem; color: rgba(255,255,255,0.7); font-weight: 500; }
.stat-divider { width: 1px; height: 36px; background: rgba(255,255,255,0.2); }

/* --- HERO VIDEO CARD --- */
.hero-video-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}
.hero-video-card {
  background: linear-gradient(145deg, rgba(38, 16, 4, 0.9), rgba(18, 7, 1, 0.96));
  border: 2px solid rgba(245, 185, 34, 0.4);
  border-radius: 22px;
  padding: 18px;
  box-shadow: 0 25px 60px rgba(0,0,0,0.7), 0 0 40px rgba(232, 66, 10, 0.35);
  backdrop-filter: blur(16px);
  width: 100%;
  max-width: 480px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.hero-video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 30px 70px rgba(0,0,0,0.8), 0 0 50px rgba(232, 66, 10, 0.5);
  border-color: var(--accent);
}
.hero-video-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding: 0 4px;
}
.live-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.3px;
}
.live-pulse {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ff3333;
  box-shadow: 0 0 0 0 rgba(255, 51, 51, 0.7);
  animation: pulseRed 1.8s infinite;
}
@keyframes pulseRed {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 51, 51, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(255, 51, 51, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 51, 51, 0); }
}
.video-format-label {
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 700;
  background: rgba(245, 185, 34, 0.15);
  padding: 3px 10px;
  border-radius: 50px;
  border: 1px solid rgba(245, 185, 34, 0.3);
}
.hero-video-player-box {
  position: relative;
  width: 100%;
  border-radius: 14px;
  overflow: hidden;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  max-height: 480px;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.8);
}
.hero-video-player-box video {
  width: 100%;
  max-height: 480px;
  object-fit: contain;
  display: block;
  outline: none;
}
.hero-sound-btn {
  position: absolute;
  bottom: 14px;
  right: 14px;
  background: rgba(0, 0, 0, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  backdrop-filter: blur(8px);
  transition: all 0.2s ease;
  z-index: 3;
}
.hero-sound-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  transform: scale(1.05);
}
.hero-video-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.meta-item {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.85);
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}
.meta-item i {
  color: var(--green);
  font-size: 0.8rem;
}
.hero-scroll-indicator {
  position: absolute;
  bottom: 24px; left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.6);
  font-size: 1.2rem;
  animation: float 2s ease infinite;
  z-index: 2;
}

/* =============================================
   TICKER
============================================= */
.ticker-bar {
  background: linear-gradient(135deg, var(--dark), var(--dark2));
  overflow: hidden;
  padding: 14px 0;
  border-top: 2px solid var(--primary);
}
.ticker-track {
  display: flex;
  gap: 60px;
  animation: ticker 30s linear infinite;
  white-space: nowrap;
  width: max-content;
}
.ticker-track span {
  color: rgba(255,255,255,0.85);
  font-size: 0.85rem;
  font-weight: 600;
  flex-shrink: 0;
}

/* =============================================
   ABOUT SECTION
============================================= */
.about-section { background: var(--light); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-images { position: relative; }
.img-main {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-dark);
  position: relative;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1 / 1;
}
.img-main img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 6px;
  display: block;
}
.img-badge {
  position: absolute;
  bottom: 24px; right: 24px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-weight: 900;
  font-size: 0.85rem;
  text-align: center;
  padding: 14px 18px;
  border-radius: 14px;
  line-height: 1.3;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}
.img-secondary {
  position: absolute;
  bottom: -30px; left: -30px;
  width: 200px;
  aspect-ratio: 4 / 3;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-dark);
  border: 4px solid #fff;
  background: #24140a;
}
.img-secondary img { width: 100%; height: 100%; object-fit: cover; }
.about-content { padding-right: 20px; }
.about-text {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.8;
}
.about-features {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 28px 0;
}
.feature-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  border-left: 4px solid var(--primary);
}
.feature-item i {
  font-size: 1.4rem;
  color: var(--primary);
  width: 28px;
  flex-shrink: 0;
}
.feature-item strong { display: block; font-weight: 700; color: var(--dark); }
.feature-item span { font-size: 0.875rem; color: var(--text-muted); }

/* =============================================
   PRODUCTS SECTION
============================================= */
.products-section { background: #fff; }
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 80px;
}
.product-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  transition: var(--transition);
  border: 2px solid transparent;
}
.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
  border-color: var(--primary);
}
.product-card.featured {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}
.product-img-wrap {
  position: relative;
  height: 330px;
  background: #faf7f2;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border);
}
.product-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  padding: 8px;
  transition: transform 0.4s ease;
}
.product-card:hover .product-img-wrap img { transform: scale(1.04); }
.product-badge {
  position: absolute;
  top: 16px; right: 16px;
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.product-badge.popular { background: var(--primary); color: #fff; }
.product-badge.premium { background: linear-gradient(135deg, #F5B922, #E8420A); color: #fff; }
.product-badge.wholesale { background: var(--green); color: #fff; }
.product-info { padding: 24px; }
.product-info h3 {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--dark);
  line-height: 1.4;
}
.product-info h3 small {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}
.product-specs {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.product-specs li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
}
.product-specs li i { color: var(--green); font-size: 0.75rem; flex-shrink: 0; }
.product-price {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 20px;
}
.price-from { font-size: 0.85rem; color: var(--text-muted); }
.price-value { font-size: 1.2rem; font-weight: 900; color: var(--primary); }

/* Use cases */
.usecases-title {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 32px;
  color: var(--dark);
}
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.usecase-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  height: 220px;
}
.usecase-card img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.usecase-card:hover img { transform: scale(1.1); }
.usecase-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(26,10,0,0.85) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 20px;
}
.usecase-overlay span {
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
}

/* =============================================
   BENEFITS SECTION
============================================= */
.benefits-section {
  position: relative;
  overflow: hidden;
}
.benefits-bg {
  position: absolute; inset: 0;
}
.benefits-bg img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.benefits-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(26,10,0,0.93) 0%, rgba(45,21,0,0.88) 100%);
}
.benefits-section .container { position: relative; z-index: 2; }
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.benefit-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
}
.benefit-card:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-4px);
  border-color: rgba(245, 185, 34, 0.4);
}
.benefit-icon { font-size: 2.5rem; margin-bottom: 16px; }
.benefit-card h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}
.benefit-card p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
}

/* =============================================
   PRICING SECTION
============================================= */
.pricing-section { background: var(--light); }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}
.pricing-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 40px 32px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.07);
  border: 2px solid var(--border);
  text-align: center;
  position: relative;
  transition: var(--transition);
}
.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}
.pricing-card--featured {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-8px);
  background: linear-gradient(180deg, #FFF8F0 0%, #fff 40%);
}
.pricing-ribbon {
  position: absolute;
  top: -14px; left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 6px 24px;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}
.pricing-header { margin-bottom: 24px; }
.pricing-icon { font-size: 2.5rem; margin-bottom: 12px; }
.pricing-header h3 { font-size: 1.3rem; font-weight: 800; margin-bottom: 6px; }
.pricing-header p { font-size: 0.875rem; color: var(--text-muted); }
.pricing-price { margin-bottom: 28px; }
.price-unit {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--primary);
}
.pricing-features {
  text-align: left;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--dark);
}
.pricing-features li i { color: var(--green); flex-shrink: 0; }
.pricing-feature--na { color: var(--text-muted) !important; }
.pricing-feature--na i { color: #ccc !important; }
.pricing-note {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: rgba(232, 66, 10, 0.08);
  border: 1px solid rgba(232, 66, 10, 0.2);
  border-radius: 14px;
  padding: 20px 24px;
}
.pricing-note i { color: var(--primary); font-size: 1.1rem; flex-shrink: 0; margin-top: 2px; }
.pricing-note p { font-size: 0.9rem; color: var(--dark2); line-height: 1.6; }

/* =============================================
   GALLERY SECTION
============================================= */
.gallery-section { background: var(--dark); }
.gallery-section .section-label { background: rgba(255,255,255,0.15); border: 1px solid rgba(255,255,255,0.3); }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 250px;
  gap: 16px;
}
.gallery-item {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  cursor: pointer;
  background: #180c05;
}
.gallery-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.5s ease;
}
.gallery-item:hover img { transform: scale(1.05); }
.gallery-item--large { grid-row: span 2; }
.gallery-item--contain { background: #261408; }
.gallery-item--contain img { object-fit: contain; padding: 12px; }
.gallery-caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 16px;
  background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 100%);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.3s;
}
.gallery-item:hover .gallery-caption { opacity: 1; }

/* =============================================
   TESTIMONIALS
============================================= */
.testimonials-section { background: #fff; }
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.testimonial-card {
  background: var(--light);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.testimonial-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
  border-color: var(--primary);
}
.testimonial-stars { font-size: 1.1rem; margin-bottom: 16px; }
.testimonial-text {
  font-size: 0.95rem;
  color: var(--dark2);
  line-height: 1.8;
  font-style: italic;
  margin-bottom: 24px;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
}
.author-avatar {
  width: 46px; height: 46px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}
.testimonial-author strong { display: block; font-weight: 800; color: var(--dark); }
.testimonial-author span { font-size: 0.8rem; color: var(--text-muted); }

/* =============================================
   TIPS & CHARCOAL LIGHTING SECTION (MẸO SỬ DỤNG)
============================================= */
.tips-section {
  background: linear-gradient(180deg, #fff 0%, var(--light) 100%);
  position: relative;
}

.tips-lighting-wrapper {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 10px 40px rgba(232, 66, 10, 0.08);
  padding: 40px 36px;
  margin-bottom: 48px;
}

.tips-lighting-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 36px;
}

.tips-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-light);
  color: var(--primary-dark);
  font-weight: 800;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 6px 16px;
  border-radius: 50px;
  margin-bottom: 12px;
}

.tips-lighting-header h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 10px;
}

.tips-lighting-header p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}

.step-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0,0,0,0.04);
}

.step-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: 0 12px 32px rgba(232, 66, 10, 0.16);
}

.step-media {
  position: relative;
  width: 100%;
  height: 180px;
  overflow: hidden;
  background: var(--dark);
}

.step-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.step-card:hover .step-media img {
  transform: scale(1.08);
}

.step-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: 50px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
  letter-spacing: 0.3px;
}

.step-body {
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.step-header-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.step-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(232, 66, 10, 0.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.step-header-wrap h4 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--dark);
  margin: 0;
}

.step-body p {
  font-size: 0.85rem;
  color: var(--dark2);
  line-height: 1.6;
  flex: 1;
}

.step-tip-badge {
  margin-top: 12px;
  background: #FFF3CD;
  color: #856404;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: 6px;
  line-height: 1.4;
  border: 1px solid rgba(133, 100, 4, 0.2);
}

/* =============================================
   VIDEO SHOWCASE (VIDEO THỰC TẾ)
============================================= */
.video-showcase {
  margin-bottom: 48px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 36px;
  box-shadow: 0 10px 40px rgba(232, 66, 10, 0.08);
}

.video-showcase-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 36px;
}

.video-badge {
  background: linear-gradient(135deg, rgba(232, 66, 10, 0.15), rgba(245, 185, 34, 0.2));
  color: var(--primary);
}

.video-showcase-header h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 10px;
}

.video-showcase-header p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.video-card {
  background: var(--light);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 16px rgba(0,0,0,0.04);
}

.video-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: var(--primary);
}

.video-player-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  overflow: hidden;
}

.video-player-wrap video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  outline: none;
}

.video-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(0, 0, 0, 0.75);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 50px;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.video-content {
  padding: 22px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.video-content h4 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 8px;
  line-height: 1.4;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.video-content h4 i {
  color: var(--primary);
  margin-top: 3px;
}

.video-content p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* =============================================
   TIPS CARDS (MẸO HAY VỚI HÌNH ẢNH)
============================================= */
.tips-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

.tip-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 16px rgba(0,0,0,0.04);
}

.tip-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
  box-shadow: 0 12px 32px rgba(245, 185, 34, 0.18);
}

.tip-card-img {
  position: relative;
  width: 100%;
  height: 190px;
  overflow: hidden;
  background: #180a02;
}

.tip-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.5s ease;
}

.tip-card:hover .tip-card-img img {
  transform: scale(1.05);
}

.tip-card-pill {
  position: absolute;
  bottom: 10px;
  left: 12px;
  background: rgba(26, 10, 0, 0.85);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 50px;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(245, 185, 34, 0.4);
}

.tip-card-body {
  padding: 20px 18px;
  flex: 1;
}

.tip-card-body h4 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 8px;
  line-height: 1.4;
}

.tip-card-body p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.tips-callout {
  background: linear-gradient(135deg, rgba(26, 10, 0, 0.95), rgba(45, 21, 0, 0.9));
  color: #fff;
  border-radius: var(--radius);
  padding: 32px 36px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
  box-shadow: var(--shadow-dark);
  border: 1px solid rgba(245, 185, 34, 0.25);
}

.tips-callout-icon {
  width: 52px;
  height: 52px;
  background: rgba(245, 185, 34, 0.2);
  color: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  flex-shrink: 0;
}

.tips-callout-text h4 {
  color: var(--accent);
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.tips-quick-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 24px;
}

.tips-quick-summary li {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.6;
  position: relative;
  padding-left: 18px;
}

.tips-quick-summary li::before {
  content: "✔";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

.tips-quick-summary li strong {
  color: #fff;
}

/* =============================================
   FAQ SECTION
============================================= */
.faq-section { background: var(--light); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 28px;
  background: #fff;
  text-align: left;
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  gap: 16px;
  transition: var(--transition);
}
.faq-question:hover { background: var(--light); color: var(--primary); }
.faq-question.active { color: var(--primary); }
.faq-icon { font-size: 0.9rem; flex-shrink: 0; transition: transform 0.3s; color: var(--primary); }
.faq-question.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
  background: #fff;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer p {
  padding: 0 28px 22px;
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.75;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* =============================================
   CTA BANNER
============================================= */
.cta-banner {
  position: relative;
  overflow: hidden;
  padding: 100px 0;
  text-align: center;
}
.cta-banner-bg { position: absolute; inset: 0; }
.cta-banner-bg img { width: 100%; height: 100%; object-fit: cover; }
.cta-banner-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(232,66,10,0.9), rgba(26,10,0,0.85));
}
.cta-banner-content { position: relative; z-index: 2; }
.cta-banner-content h2 {
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  font-weight: 900;
  color: #fff;
  margin-bottom: 16px;
}
.cta-banner-content p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 36px;
}
.cta-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 16px; }

/* =============================================
   CONTACT SECTION
============================================= */
.contact-section { background: #fff; }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: start;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.contact-icon {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, var(--primary), #FF6B35);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-icon--zalo { background: #0068FF; }
.contact-icon--zalo img { width: 28px; height: 28px; object-fit: contain; }
.contact-item h4 { font-weight: 700; margin-bottom: 4px; }
.contact-item a { color: var(--primary); font-weight: 600; font-size: 1rem; }
.contact-item span { color: var(--text-muted); font-size: 0.9rem; }
.contact-qr { margin-top: 28px; }
.contact-qr p { font-size: 0.875rem; color: var(--text-muted); margin-bottom: 14px; }
.qr-mock {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  background: var(--light);
  border: 2px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  width: 160px;
  cursor: pointer;
  transition: var(--transition);
}
.qr-mock:hover { border-color: #0068FF; box-shadow: 0 4px 20px rgba(0,104,255,0.2); }
.qr-mock img { width: 60px; }
.qr-mock span { font-size: 0.8rem; font-weight: 700; color: #0068FF; text-align: center; line-height: 1.4; }

/* Contact Form */
.contact-form-wrap {
  background: var(--light);
  border-radius: var(--radius);
  padding: 40px;
  border: 1px solid var(--border);
}
.contact-form h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 28px;
  color: var(--dark);
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid var(--border);
  border-radius: 12px;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--dark);
  background: #fff;
  transition: border-color 0.2s;
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232, 66, 10, 0.1);
}
.form-note { font-size: 0.8rem; color: var(--text-muted); margin-top: 12px; text-align: center; }

/* =============================================
   FOOTER
============================================= */
.footer { background: var(--dark); }
.footer-top { padding: 80px 0 48px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.footer-logo .logo-flame { font-size: 1.5rem; }
.footer-brand p {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
  margin-bottom: 24px;
}
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 40px; height: 40px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 1rem;
  transition: var(--transition);
}
.footer-social a:hover { background: var(--primary); transform: translateY(-2px); }
.footer-social a[aria-label="Zalo"]:hover { background: #0068FF; }
.footer-social img { width: 24px; height: 24px; object-fit: contain; border-radius: 4px; }
.footer-zalo-inline { width: 18px; height: 18px; object-fit: contain; border-radius: 3px; vertical-align: middle; }
.footer-links h4,
.footer-products h4,
.footer-contact h4 {
  color: #fff;
  font-weight: 800;
  margin-bottom: 20px;
  font-size: 0.95rem;
}
.footer-links ul li,
.footer-products ul li {
  margin-bottom: 10px;
}
.footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: 0.875rem;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--accent); }
.footer-products li { color: rgba(255,255,255,0.6); font-size: 0.875rem; }
.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.footer-contact-item i { color: var(--accent); width: 18px; }
.footer-contact-item a { color: rgba(255,255,255,0.7); font-size: 0.875rem; }
.footer-contact-item a:hover { color: var(--accent); }
.footer-contact-item span { color: rgba(255,255,255,0.6); font-size: 0.875rem; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0;
  text-align: center;
}
.footer-bottom p { color: rgba(255,255,255,0.4); font-size: 0.82rem; }
.footer-keywords {
  margin-top: 6px !important;
  font-size: 0.78rem !important;
  color: rgba(255,255,255,0.2) !important;
}

/* =============================================
   FLOATING BUTTONS
============================================= */
.floating-buttons {
  position: fixed;
  bottom: 100px;
  right: 24px;
  z-index: 998;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.floating-btn {
  width: 54px; height: 54px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  position: relative;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
  text-decoration: none;
  color: #fff;
}
.floating-btn:hover { transform: scale(1.1) translateY(-2px); }
.floating-btn--zalo { background: #0068FF; }
.floating-btn--zalo img { width: 34px; height: 34px; object-fit: contain; }
.floating-btn--phone { background: linear-gradient(135deg, var(--primary), #FF6B35); font-size: 1.2rem; }
.floating-btn--top {
  background: rgba(26,10,0,0.8);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2);
  font-size: 0.9rem;
}
.floating-pulse {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: inherit;
  opacity: 0.4;
  animation: pulse 2.5s ease infinite;
}
.floating-tooltip {
  position: absolute;
  right: 64px;
  background: var(--dark);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 8px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}
.floating-tooltip::after {
  content: '';
  position: absolute;
  top: 50%; right: -6px;
  transform: translateY(-50%);
  border: 6px solid transparent;
  border-right: none;
  border-left-color: var(--dark);
}
.floating-btn:hover .floating-tooltip { opacity: 1; }

/* =============================================
   CHATBOT
============================================= */
.chatbot-toggle {
  position: fixed;
  bottom: 28px; right: 24px;
  z-index: 999;
  width: 60px; height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), #FF6B35);
  color: #fff;
  font-size: 1.4rem;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 24px rgba(232,66,10,0.5);
  transition: var(--transition);
  cursor: pointer;
  border: 3px solid rgba(255,255,255,0.3);
}
.chatbot-toggle:hover { transform: scale(1.1); }
.chat-badge {
  position: absolute;
  top: -4px; right: -4px;
  width: 22px; height: 22px;
  background: #FF0000;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 800;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  border: 2px solid #fff;
  animation: pulse 2s ease infinite;
}
.chatbot-toggle .floating-pulse { background: var(--primary); }

.chatbot-container {
  position: fixed;
  bottom: 100px; right: 24px;
  z-index: 999;
  width: 360px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
  display: none;
  flex-direction: column;
  max-height: 520px;
  background: #fff;
}
.chatbot-container.open { display: flex; animation: fadeUp 0.3s ease; }
.chatbot-header {
  background: linear-gradient(135deg, var(--dark), var(--dark2));
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: default;
}
.chatbot-avatar {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
}
.chatbot-title strong { display: block; color: #fff; font-size: 0.95rem; }
.chatbot-status { font-size: 0.75rem; color: rgba(255,255,255,0.6); display: flex; align-items: center; gap: 5px; }
.chatbot-status i { font-size: 0.5rem; color: #4CAF50; }
.chatbot-close {
  margin-left: auto;
  color: rgba(255,255,255,0.7);
  font-size: 1.1rem;
  padding: 4px;
  transition: color 0.2s;
}
.chatbot-close:hover { color: #fff; }

.chatbot-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #f7f8fa;
}
.chat-msg { display: flex; flex-direction: column; gap: 4px; max-width: 85%; }
.chat-msg.bot { align-self: flex-start; }
.chat-msg.user { align-self: flex-end; }
.chat-bubble {
  padding: 12px 16px;
  border-radius: 18px;
  font-size: 0.9rem;
  line-height: 1.55;
}
.chat-msg.bot .chat-bubble {
  background: #fff;
  color: var(--dark);
  border-bottom-left-radius: 4px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.chat-msg.user .chat-bubble {
  background: linear-gradient(135deg, var(--primary), #FF6B35);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.chat-time { font-size: 0.7rem; color: var(--text-muted); padding: 0 4px; }
.chat-msg.user .chat-time { text-align: right; }
.chat-quick-replies { display: flex; flex-wrap: wrap; gap: 8px; padding-top: 4px; }
.quick-reply {
  background: #fff;
  border: 1.5px solid var(--primary);
  color: var(--primary);
  padding: 7px 14px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}
.quick-reply:hover { background: var(--primary); color: #fff; }

.chatbot-input-area {
  display: flex;
  gap: 0;
  padding: 12px 16px;
  background: #fff;
  border-top: 1px solid var(--border);
}
#chatInput {
  flex: 1;
  border: 1.5px solid var(--border);
  border-radius: 12px 0 0 12px;
  padding: 12px 16px;
  font-size: 0.875rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}
#chatInput:focus { border-color: var(--primary); }
#chatSend {
  background: linear-gradient(135deg, var(--primary), #FF6B35);
  color: #fff;
  padding: 12px 18px;
  border-radius: 0 12px 12px 0;
  font-size: 1rem;
  transition: var(--transition);
}
#chatSend:hover { background: var(--primary-dark); }

/* =============================================
   RESPONSIVE
============================================= */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; text-align: center; }
  .hero-content { margin: 0 auto; }
  .hero-tags, .hero-actions, .hero-stats { justify-content: center; }
  .hero-video-wrapper { width: 100%; max-width: 440px; margin: 0 auto; }
  .about-grid { grid-template-columns: 1fr; }
  .img-secondary { display: none; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .benefits-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: 1fr; }
  .tips-cards-grid { grid-template-columns: repeat(2, 1fr); }
  .tips-quick-summary { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto 40px; }
  .pricing-card--featured { transform: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .hero-container { padding: 90px 18px 40px; }
  .hero-content { padding: 0; }
  .hero-video-card { padding: 12px; }
  .hero-video-meta { grid-template-columns: 1fr; gap: 6px; }
  .products-grid { grid-template-columns: 1fr; }
  .usecases-grid { grid-template-columns: 1fr; }
  .benefits-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .tips-cards-grid { grid-template-columns: 1fr; }
  .tips-lighting-wrapper { padding: 28px 18px; }
  .video-showcase { padding: 28px 18px; }
  .tips-callout { flex-direction: column; padding: 24px 20px; gap: 16px; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 200px; }
  .gallery-item--large { grid-row: auto; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .stat-divider { width: 60px; height: 1px; }
  .chatbot-container { width: calc(100vw - 32px); right: 16px; bottom: 90px; }
  .nav-container { padding: 14px 20px; }
  .hero-title { font-size: clamp(2.3rem, 9vw, 3.8rem); }
}
@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { justify-content: center; }
  .contact-form-wrap { padding: 24px; }
  .floating-buttons { right: 12px; }
  .chatbot-toggle { right: 12px; }
}

/* ===== BẢNG THÔNG SỐ KỸ THUẬT (GEO Optimized) ===== */
.specs-section { background: var(--light); }
.specs-table-wrap {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.specs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.specs-table thead { background: var(--dark); color: #fff; }
.specs-table th {
  padding: 16px 20px;
  text-align: left;
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.specs-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.specs-table tbody tr:nth-child(even) { background: rgba(232,66,10,0.03); }
.specs-table tbody tr:hover { background: rgba(232,66,10,0.08); }
.specs-table .spec-label {
  font-weight: 600;
  color: var(--dark);
  white-space: nowrap;
}
.specs-table .spec-value {
  color: var(--primary);
  font-weight: 700;
}
.specs-table .spec-note {
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-top: 4px;
}
.specs-source {
  text-align: right;
  color: var(--text-muted);
  font-size: 0.78rem;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  font-style: italic;
}

/* ===== SO SÁNH CHI PHÍ (Cost Comparison) ===== */
.cost-section { background: #fff; }
.cost-compare-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.cost-card {
  background: var(--light);
  border-radius: var(--radius);
  padding: 32px 24px;
  border: 1px solid var(--border);
  text-align: center;
  transition: var(--transition);
  position: relative;
}
.cost-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.cost-card--winner {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 8px 32px rgba(232,66,10,0.2);
}
.cost-card--winner::before {
  content: '⭐ Tiết kiệm nhất';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
  white-space: nowrap;
}
.cost-card-icon { font-size: 2.5rem; margin-bottom: 16px; }
.cost-card h4 { font-size: 1.1rem; font-weight: 800; margin-bottom: 8px; }
.cost-card .cost-price { font-size: 1.6rem; font-weight: 900; color: var(--primary); margin: 12px 0; }
.cost-card .cost-unit { font-size: 0.8rem; color: var(--text-muted); }
.cost-card ul { text-align: left; margin-top: 16px; }
.cost-card ul li {
  font-size: 0.85rem;
  padding: 6px 0;
  border-bottom: 1px dashed rgba(0,0,0,0.08);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.cost-card ul li i { color: var(--primary); margin-top: 3px; flex-shrink: 0; }
.cost-card ul li i.fa-check { color: var(--green); }
.cost-card ul li i.fa-xmark { color: #D32F2F; }
.cost-summary {
  margin-top: 40px;
  background: linear-gradient(135deg, var(--dark), var(--dark2));
  color: #fff;
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
}
.cost-summary h4 { font-size: 1.1rem; margin-bottom: 12px; color: var(--accent); }
.cost-summary p { color: rgba(255,255,255,0.85); line-height: 1.8; }
.cost-summary strong { color: var(--accent); }

/* ===== BÀI TOÁN CHUYỂN ĐỔI THAN TỔ ONG ===== */
.conversion-callout {
  margin-top: 40px;
  background: linear-gradient(135deg, #FFF3E0, #FFF8F0);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 32px;
}
.conversion-callout h4 {
  color: var(--dark);
  font-size: 1.15rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.conversion-callout .conv-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
}
.conv-box {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  border: 1px solid var(--border);
}
.conv-box h5 { font-weight: 700; margin-bottom: 8px; }
.conv-box.conv-bad { border-color: #D32F2F; }
.conv-box.conv-good { border-color: var(--green); }
.conv-arrow { font-size: 2rem; color: var(--primary); font-weight: 900; }
.conv-box ul { text-align: left; margin-top: 10px; }
.conv-box ul li { font-size: 0.85rem; padding: 4px 0; display: flex; gap: 6px; align-items: flex-start; }
.conv-box ul li i { margin-top: 3px; flex-shrink: 0; }

@media (max-width: 768px) {
  .cost-compare-grid { grid-template-columns: 1fr; }
  .conversion-callout .conv-grid { grid-template-columns: 1fr; }
  .conv-arrow { transform: rotate(90deg); justify-self: center; }
  .specs-table { font-size: 0.85rem; }
  .specs-table th, .specs-table td { padding: 10px 14px; }
}