/* ===== RESET & VARIABLES ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
:root {
  --white: #ffffff;
  --bg-light: #faf9f7;
  --bg-card: #fdfcfb;
  --bg-dark: #0a0908;
  --gold: #c9a66b;
  --gold-light: #e5d4b3;
  --gold-hover: #b8956c;
  --gold-dark: #8b6914;
  --brown: #1a1614;
  --brown-light: #3d3229;
  --text: #1a1614;
  --text-muted: #6b5f54;
  --border: #e8e2db;
  --success: #10b981;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 40px rgba(201, 166, 107, 0.3);
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --gradient-gold: linear-gradient(
    135deg,
    #c9a66b 0%,
    #e5d4b3 50%,
    #c9a66b 100%
  );
  --gradient-dark: linear-gradient(135deg, #1a1614 0%, #3d3229 100%);
  --gradient-shine: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
}

html {
  scroll-behavior: smooth;
  /* Ngăn text size adjustment tự động */
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  text-size-adjust: 100%;
  /* Đảm bảo font-size cơ bản */
  font-size: 16px;
}

body {
  font-family:
    "Be Vietnam Pro",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  background: var(--white);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  /* Ngăn text size adjustment tự động trên mobile */
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  text-size-adjust: 100%;
  /* Ngăn tap highlight trên mobile */
  -webkit-tap-highlight-color: transparent;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes glow {
  0%,
  100% {
    box-shadow: 0 0 20px rgba(201, 166, 107, 0.3);
  }
  50% {
    box-shadow: 0 0 40px rgba(201, 166, 107, 0.6);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

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

a {
  text-decoration: none;
  color: inherit;
}

/* ===== UTILITIES ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 36px;
  border: none;
  border-radius: 100px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  font-family: inherit;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.3px;
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  transition: left 0.5s ease;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--gradient-gold);
  background-size: 200% 200%;
  color: var(--brown);
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(201, 166, 107, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(201, 166, 107, 0.5);
  background-position: right center;
}

.btn-dark {
  background: var(--gradient-dark);
  color: var(--gold);
  border: 1px solid rgba(201, 166, 107, 0.3);
}

.btn-dark:hover {
  border-color: var(--gold);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  transform: translateY(-3px);
}

.btn-outline {
  background: transparent;
  color: var(--gold);
  border: 2px solid var(--gold);
}

.btn-outline:hover {
  background: var(--gold);
  color: var(--brown);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
  position: relative;
}

.section-header::after {
  content: "";
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background: var(--gradient-gold);
  border-radius: 3px;
}

.section-header h2 {
  font-size: 40px;
  font-weight: 700;
  color: var(--brown);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.section-header p {
  color: var(--text-muted);
  font-size: 18px;
  max-width: 500px;
  margin: 0 auto;
}

/* ===== HERO BANNER SIMPLE ===== */
.hero-banner-simple {
  padding-top: 70px;
  width: 100%;
}

.hero-banner-simple a {
  display: block;
  width: 100%;
}

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

@media (max-width: 768px) {
  .hero-banner-simple {
    padding-top: 60px;
  }
}

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(201, 166, 107, 0.1);
  z-index: 1000;
  padding: 10px 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
  transition: all 0.4s ease;
}

.header.scrolled {
  padding: 8px 0;
}

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

.header-title-mobile {
  display: block;
  font-size: 22px;
  font-weight: 700;
  color: var(--brown);
  text-align: center;
  flex: 1;
  padding: 0 20px;
  letter-spacing: 0.5px;
}

.logo {
  display: flex;
  align-items: center;
  transition: transform 0.3s ease;
}

.logo:hover {
  transform: scale(1.05);
}

.logo img {
  height: 70px;
  width: auto;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.hotline {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  color: var(--brown);
  font-size: 17px;
  transition: all 0.3s ease;
}

.hotline:hover {
  color: var(--gold);
}

.hotline-icon {
  width: 44px;
  height: 44px;
  background: var(--gradient-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brown);
  font-size: 18px;
  box-shadow: 0 4px 15px rgba(201, 166, 107, 0.4);
  animation: pulse 2s infinite;
}

.header .btn {
  padding: 12px 28px;
  font-size: 14px;
}

@media (max-width: 640px) {
  .hotline span:last-child {
    display: none;
  }
  .header .btn {
    display: none;
  }
  .logo img {
    height: 60px;
  }
  .header-title-mobile {
    font-size: 14px;
    font-weight: 600;
    padding: 0 10px;
  }
}

/* ===== HERO BANNER ===== */
.hero-banner {
  padding-top: 87px;
  position: relative;
  width: 100%;
  min-height: 90vh;
  background: url("../images/giuongbocda/landscape3.png") center
    center / cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 9, 8, 0.4) 0%,
    rgba(26, 22, 20, 0.7) 50%,
    rgba(10, 9, 8, 0.9) 100%
  );
}

.hero-banner::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
    ellipse at center,
    transparent 0%,
    rgba(10, 9, 8, 0.5) 100%
  );
}

.hero-particles {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  z-index: 1;
}

.hero-particles span {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--gold);
  border-radius: 50%;
  opacity: 0.4;
  animation: float 6s ease-in-out infinite;
}

.hero-particles span:nth-child(1) {
  left: 10%;
  top: 20%;
  animation-delay: 0s;
}
.hero-particles span:nth-child(2) {
  left: 20%;
  top: 60%;
  animation-delay: 1s;
}
.hero-particles span:nth-child(3) {
  left: 35%;
  top: 30%;
  animation-delay: 2s;
}
.hero-particles span:nth-child(4) {
  left: 50%;
  top: 70%;
  animation-delay: 3s;
}
.hero-particles span:nth-child(5) {
  left: 65%;
  top: 40%;
  animation-delay: 4s;
}
.hero-particles span:nth-child(6) {
  left: 80%;
  top: 20%;
  animation-delay: 5s;
}
.hero-particles span:nth-child(7) {
  left: 90%;
  top: 50%;
  animation-delay: 2.5s;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 80px 20px;
  animation: fadeInUp 1s ease-out;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(201, 166, 107, 0.15);
  border: 1px solid rgba(201, 166, 107, 0.3);
  backdrop-filter: blur(10px);
  padding: 10px 24px;
  border-radius: 100px;
  margin-bottom: 30px;
  animation: fadeIn 1s ease-out 0.3s both;
}

.hero-badge span {
  color: var(--gold);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.hero-logo {
  max-width: 320px;
  height: auto;
  margin: 0 auto 35px;
  filter: drop-shadow(0 8px 30px rgba(0, 0, 0, 0.4));
  animation: fadeIn 1s ease-out 0.5s both;
}

.hero-tagline {
  font-size: 1.3rem;
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
  font-weight: 300;
  letter-spacing: 0.5px;
  animation: fadeIn 1s ease-out 0.7s both;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeIn 1s ease-out 0.9s both;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  animation: fadeIn 1s ease-out 1.2s both;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--gold), transparent);
  animation: pulse 2s infinite;
}

@media (max-width: 768px) {
  .hero-banner {
    min-height: 100vh;
    padding-top: 77px;
  }

  .hero-logo {
    max-width: 220px;
    margin-bottom: 25px;
  }

  .hero-tagline {
    font-size: 1rem;
    padding: 0 20px;
    margin-bottom: 30px;
  }

  .hero-badge {
    padding: 8px 18px;
  }

  .hero-badge span {
    font-size: 11px;
  }

  .hero-scroll {
    display: none;
  }
}

/* ===== PRODUCT SELECTOR ===== */
.product-section {
  padding: 120px 0;
  background: linear-gradient(
    180deg,
    var(--bg-light) 0%,
    var(--white) 100%
  );
  position: relative;
}

.product-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--gold-light),
    transparent
  );
}

/* Product Display - 2 Column Layout */
.product-display {
  max-width: 1200px;
  margin: 0 auto 60px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 80px;
  align-items: start;
}

@media (max-width: 968px) {
  .product-display {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* LEFT COLUMN - Images */
.product-images {
  position: sticky;
  top: 110px;
}

.main-product-image {
  width: 100%;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-bottom: 20px;
  background: linear-gradient(145deg, #ffffff, #f8f6f3);
  position: relative;
  border: 1px solid rgba(201, 166, 107, 0.1);
}

.main-product-image::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: var(--radius-xl);
  padding: 2px;
  background: linear-gradient(
    145deg,
    rgba(201, 166, 107, 0.3),
    transparent
  );
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.main-product-image img {
  width: 100%;
  height: 520px;
  object-fit: contain;
  padding: 30px;
  display: block;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.main-product-image:hover img {
  transform: scale(1.03);
}

/* Thumbnail Slider Container */
.thumbnail-slider-container {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  margin-bottom: 25px;
}

.thumbnail-slider {
  flex: 1;
  overflow: hidden;
  border-radius: var(--radius);
  cursor: grab;
  touch-action: pan-x;
  -webkit-overflow-scrolling: touch;
  position: relative;
  /* Cải thiện performance */
  will-change: transform;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

.thumbnail-slider:active {
  cursor: grabbing;
}

/* Gradient indicators for more content */
.thumbnail-slider::before,
.thumbnail-slider::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 40px;
  z-index: 10;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.thumbnail-slider::before {
  left: 0;
  background: linear-gradient(to right, rgba(250, 249, 247, 0.95), transparent);
}

.thumbnail-slider::after {
  right: 0;
  background: linear-gradient(to left, rgba(250, 249, 247, 0.95), transparent);
}

.thumbnail-slider.has-prev::before {
  opacity: 1;
}

.thumbnail-slider.has-next::after {
  opacity: 1;
}

/* Arrow hint icons */
.slider-hint {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 11;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  font-size: 14px;
  color: var(--gold-dark);
}

.slider-hint-left {
  left: 8px;
}

.slider-hint-right {
  right: 8px;
}

.thumbnail-slider.has-prev ~ .slider-hint-left,
.thumbnail-slider-container:has(.has-prev) .slider-hint-left {
  opacity: 0.8;
}

.thumbnail-slider.has-next ~ .slider-hint-right,
.thumbnail-slider-container:has(.has-next) .slider-hint-right {
  opacity: 0.8;
}

.thumbnail-images {
  display: flex;
  gap: 12px;
  transition: transform 0.3s ease-out;
  will-change: transform;
  user-select: none;
  -webkit-user-select: none;
  /* Cải thiện performance trên mobile */
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.thumbnail {
  flex: 0 0 calc((100% - 48px) / 5); /* Show 5 thumbnails at a time */
  min-width: calc((100% - 48px) / 5);
  border: 2px solid transparent;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  background: linear-gradient(145deg, #ffffff, #f8f6f3);
  position: relative;
  -webkit-tap-highlight-color: transparent;
  display: flex;
  flex-direction: column;
}

.thumbnail:hover {
  border-color: var(--gold);
  box-shadow: 0 8px 25px rgba(201, 166, 107, 0.25);
}

.thumbnail.active {
  border-color: var(--gold);
  box-shadow:
    0 0 0 3px rgba(201, 166, 107, 0.2),
    0 8px 25px rgba(201, 166, 107, 0.25);
}

.thumbnail img {
  width: 100%;
  height: 100px;
  object-fit: contain;
  padding: 8px;
  display: block;
  position: relative;
  z-index: 2;
  pointer-events: none;
  -webkit-user-drag: none;
}

.thumbnail-info {
  padding: 6px 4px;
  text-align: center;
  background: linear-gradient(to bottom, rgba(250, 249, 247, 0.5), rgba(255, 255, 255, 1));
  border-top: 1px solid rgba(201, 166, 107, 0.1);
}

.thumbnail-name {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--brown);
  line-height: 1.2;
}

.thumbnail-color {
  display: block;
  font-size: 10px;
  color: var(--gold-dark);
  font-weight: 500;
  margin-top: 1px;
}

.thumbnail.active .thumbnail-info {
  background: linear-gradient(to bottom, rgba(201, 166, 107, 0.1), rgba(201, 166, 107, 0.05));
}

/* Size Section Below Image */
.size-section-below-image {
  margin-top: 8px;
  margin-bottom: 32px;
  padding: 8px;
  background: linear-gradient(145deg, rgba(250, 249, 247, 0.8), rgba(255, 255, 255, 0.5));
  border-radius: 10px;
  border: 1px solid rgba(201, 166, 107, 0.15);
}

.size-section-below-image .section-label {
  font-size: 0.85rem;
  margin-bottom: 8px;
  font-weight: 600;
}

.size-section-below-image .size-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 5px;
}

.size-section-below-image .size-btn {
  padding: 6px 3px;
  border-radius: 8px;
  border-width: 1px;
}

.size-section-below-image .size-btn .size {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 2px;
}

.size-section-below-image .size-btn .price {
  font-size: 11px;
  font-weight: 600;
}

.size-section-below-image .size-option input:checked + .size-btn {
  box-shadow: 0 0 0 2px rgba(201, 166, 107, 0.15);
}

@media (max-width: 968px) {
  .thumbnail {
    flex: 0 0 calc((100% - 24px) / 3.5); /* Show 3.5 thumbnails on tablet để người dùng biết có thể vuốt */
    min-width: calc((100% - 24px) / 3.5);
  }
  
  .thumbnail img {
    height: 85px;
  }
  
  .size-section-below-image .size-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 640px) {
  .thumbnail {
    flex: 0 0 calc((100% - 16px) / 2.5); /* Show 2.5 thumbnails on mobile để người dùng biết có thể vuốt */
    min-width: calc((100% - 16px) / 2.5);
    border-width: 3px; /* Tăng border để dễ nhìn khi active */
    touch-action: manipulation; /* Cải thiện touch response */
  }
  
  .thumbnail img {
    height: 90px; /* Tăng chiều cao để dễ nhìn hơn */
    padding: 10px;
  }
  
  .thumbnail-info {
    padding: 8px 4px; /* Tăng padding để dễ tap */
  }
  
  .thumbnail-name {
    font-size: 11px;
    font-weight: 700;
  }
  
  .thumbnail-color {
    font-size: 10px;
  }
  
  /* Tăng vùng tap cho thumbnail trên mobile */
  .thumbnail::before {
    content: '';
    position: absolute;
    inset: -8px; /* Mở rộng vùng tap ra ngoài 8px */
    z-index: 1;
  }
  
  /* Đảm bảo nội dung thumbnail vẫn hiển thị đúng */
  .thumbnail img,
  .thumbnail-info {
    position: relative;
    z-index: 2;
    pointer-events: none; /* Để touch event đi qua thumbnail container */
  }
  
  /* Visual feedback khi tap */
  .thumbnail:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
  }
  
  /* Tăng kích thước gradient indicators trên mobile */
  .thumbnail-slider::before,
  .thumbnail-slider::after {
    width: 50px;
  }
  
  /* Tăng kích thước arrow hints trên mobile */
  .slider-hint {
    width: 28px;
    height: 28px;
    font-size: 16px;
    font-weight: bold;
  }
  
  /* Giảm khoảng cách cho size section */
  .size-section-below-image {
    margin-top: 6px;
    margin-bottom: 32px;
    padding: 6px;
  }
  
  .size-section-below-image .section-label {
    margin-bottom: 6px;
    font-size: 0.8rem;
  }
  
  .size-section-below-image .size-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
  }
  
  .size-section-below-image .size-btn {
    padding: 5px 2px;
  }
  
  .size-section-below-image .size-btn .size {
    font-size: 12px;
  }
  
  .size-section-below-image .size-btn .price {
    font-size: 10px;
  }
  
  /* Cải thiện main image trên mobile */
  .main-product-image {
    margin-bottom: 8px;
  }
  
  .main-product-image img {
    height: 300px;
    padding: 20px;
  }
  
  /* Giảm gap giữa các thumbnail */
  .thumbnail-images {
    gap: 10px;
  }
  
  /* Giảm margin của thumbnail-slider-container */
  .thumbnail-slider-container {
    margin-bottom: 10px;
  }
  
  /* Cải thiện active state trên mobile */
  .thumbnail.active {
    border-width: 3px;
    box-shadow:
      0 0 0 4px rgba(201, 166, 107, 0.25),
      0 8px 25px rgba(201, 166, 107, 0.3);
    transform: scale(1);
  }
  
  /* Tắt hover effect trên mobile */
  .thumbnail:hover {
    border-color: transparent;
    box-shadow: none;
  }
  
  .thumbnail.active:hover {
    border-color: var(--gold);
    box-shadow:
      0 0 0 4px rgba(201, 166, 107, 0.25),
      0 8px 25px rgba(201, 166, 107, 0.3);
  }
  
  /* Cải thiện slider container - ngăn scroll trang khi vuốt slider */
  .thumbnail-slider {
    touch-action: pan-x; /* Chỉ cho phép scroll ngang */
    overscroll-behavior-x: contain; /* Ngăn overscroll ngang ảnh hưởng đến trang */
  }
  
  /* Cải thiện thumbnail-slider-container */
  .thumbnail-slider-container {
    overscroll-behavior: contain; /* Ngăn overscroll ảnh hưởng đến trang */
    isolation: isolate; /* Tạo stacking context riêng */
  }
  
  /* Giảm khoảng cách của price-section trên mobile */
  .price-section {
    margin-bottom: 15px;
    padding: 18px;
    gap: 12px;
  }
  
  /* Giảm padding của product-details */
  .product-details {
    padding: 15px 0;
  }
}

/* RIGHT COLUMN - Details */
.product-details {
  padding: 30px 0;
}

.product-name {
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--brown);
  margin-bottom: 30px;
  line-height: 1.2;
  letter-spacing: -0.5px;
  position: relative;
}

.product-name::after {
  content: "";
  position: absolute;
  bottom: -12px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--gradient-gold);
  border-radius: 3px;
}

.color-section {
  margin-bottom: 35px;
  padding-top: 10px;
}

.section-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section-label span {
  color: var(--gold);
  font-weight: 700;
}

.color-options {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.color-dot-option {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 3px solid transparent;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.color-dot-option::before {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px solid transparent;
  transition: all 0.3s ease;
}

.color-dot-option:hover {
  transform: scale(1.1) translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.color-dot-option:hover::before {
  border-color: var(--gold);
}

.color-dot-option.active {
  border: 3px solid var(--gold);
  box-shadow:
    0 0 0 4px rgba(201, 166, 107, 0.2),
    0 8px 25px rgba(0, 0, 0, 0.15);
  transform: scale(1.05);
}

.color-dot-option.active::after {
  content: "✓";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 18px;
  font-weight: bold;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.color-gray {
  background: linear-gradient(145deg, #a8a8a8, #8a8a8a);
}
.color-dark-gray {
  background: linear-gradient(145deg, #5a5a5a, #3d3d3d);
}
.color-cream {
  background: linear-gradient(145deg, #fffefa, #f8f6f0);
}

.color-cream.active::after {
  color: var(--brown);
  text-shadow: none;
}

.product-description {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
  padding: 20px;
  background: linear-gradient(
    145deg,
    rgba(250, 249, 247, 0.8),
    rgba(255, 255, 255, 0.5)
  );
  border-radius: var(--radius);
  border-left: 3px solid var(--gold);
}

.policy-links {
  display: flex;
  gap: 20px;
  margin-top: 15px;
  flex-wrap: wrap;
}

.policy-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--gradient-gold);
  color: var(--brown);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 20px;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(201, 166, 107, 0.3);
}

.policy-links a:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(201, 166, 107, 0.4);
}

.price-section {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 25px;
  background: linear-gradient(145deg, #fffbf5, #fff8ef);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(201, 166, 107, 0.2);
}

.price-old {
  font-size: 1.2rem;
  color: #999;
  text-decoration: line-through;
}

.price-current {
  font-size: 2.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, #c92a2a, #a02020);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.price-badge {
  background: linear-gradient(135deg, #ffe0e0, #ffd0d0);
  color: #c92a2a;
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  animation: pulse 2s infinite;
}

.model-section {
  margin-bottom: 35px;
}

.model-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.model-btn {
  padding: 18px 32px;
  background: white;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  color: var(--brown);
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.model-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--gradient-shine);
  transition: left 0.5s ease;
}

.model-btn:hover {
  border-color: var(--gold);
  color: var(--gold);
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.model-btn:hover::before {
  left: 100%;
}

.model-btn.active {
  background: var(--gradient-dark);
  border-color: var(--brown);
  color: var(--gold);
  box-shadow: 0 8px 25px rgba(26, 22, 20, 0.3);
}

/* Size Selection in Product Details */
.product-details .size-section {
  margin-bottom: 35px;
}

.product-details .size-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.size-option {
  position: relative;
}

.size-option input {
  display: none;
}

.size-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 12px;
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.25s ease;
}

.size-btn:hover {
  border-color: var(--gold);
}

.size-option input:checked + .size-btn {
  border-color: var(--gold);
  background: linear-gradient(
    135deg,
    rgba(201, 166, 107, 0.08),
    rgba(201, 166, 107, 0.02)
  );
  box-shadow: 0 0 0 3px rgba(201, 166, 107, 0.12);
}

.size-btn .size {
  font-size: 16px;
  font-weight: 600;
  color: var(--brown);
  margin-bottom: 4px;
}

.size-btn .price {
  font-size: 14px;
  color: var(--gold);
  font-weight: 600;
}

@media (max-width: 968px) {
  .product-details .size-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 640px) {
  .product-details .size-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.cta-section {
  margin-top: 40px;
}

.btn-cta {
  width: 100%;
  padding: 18px 30px;
  font-size: 1.1rem;
  animation: glow 2s infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.btn-cta .cta-text {
  font-weight: 700;
}

.btn-cta .cta-divider {
  margin: 0 10px;
  opacity: 0.7;
}

.btn-cta .cta-price {
  font-weight: 800;
  font-size: 1.2rem;
  color: #c92a2a;
}

@media (max-width: 968px) {
  .product-images {
    position: static;
  }
  .main-product-image img {
    height: 350px;
    padding: 25px;
  }
  .thumbnail img {
    height: 85px;
  }
  .product-name {
    font-size: 1.8rem;
  }
  .price-current {
    font-size: 2rem;
  }
  
  /* Cải thiện thumbnail slider container trên tablet */
  .thumbnail-slider-container {
    margin-bottom: 20px;
  }
}

.product-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--gold);
  color: var(--white);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.product-info {
  padding: 20px;
  border-top: 1px solid var(--border);
}

.product-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--brown);
  margin-bottom: 12px;
}

/* Color Selector */
.color-selector {
  margin-bottom: 8px;
}

.color-label {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.color-label span {
  color: var(--gold);
  font-weight: 600;
}

.color-dots {
  display: flex;
  gap: 10px;
}

.color-dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  border: 3px solid transparent;
  transition: all 0.2s ease;
  position: relative;
}

.color-dot:hover {
  transform: scale(1.1);
}

.color-dot.active {
  border-color: var(--gold);
  box-shadow: 0 0 0 2px rgba(184, 149, 108, 0.3);
}

.color-dot.active::after {
  content: "✓";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 14px;
  font-weight: bold;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.color-dot.color-gray {
  background: #8a8a8a;
}

.color-dot.color-dark-gray {
  background: #3d3d3d;
}

.color-dot.color-cream {
  background: #f8f6f0;
  border-color: var(--border);
}

.color-dot.color-cream.active {
  border-color: var(--gold);
}

.color-dot.color-cream.active::after {
  color: var(--brown);
  text-shadow: none;
}

.check-icon {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 28px;
  height: 28px;
  background: var(--gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  opacity: 0;
  transform: scale(0.5);
  transition: all 0.25s ease;
}

.product-card.selected .check-icon {
  opacity: 1;
  transform: scale(1);
}

@media (max-width: 768px) {
  .product-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }
  .product-info {
    padding: 16px;
  }
  .product-name {
    font-size: 16px;
  }
  .color-dot {
    width: 28px;
    height: 28px;
  }
}

/* ===== ORDER MODAL ===== */
.order-modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 9, 8, 0.8);
  backdrop-filter: blur(10px);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow-y: auto;
}

.order-modal-overlay.show {
  display: flex;
  animation: fadeIn 0.3s ease;
}

.order-modal {
  background: white;
  border-radius: var(--radius-xl);
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
  animation: modalSlideIn 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid rgba(201, 166, 107, 0.1);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes modalSlideUp {
  from {
    opacity: 0;
    transform: translateY(100%);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 480px) {
  .order-modal {
    animation: modalSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  }
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  border: none;
  background: rgba(0, 0, 0, 0.05);
  border-radius: 50%;
  font-size: 24px;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  z-index: 10;
}

.modal-close:hover {
  background: var(--gold);
  color: var(--brown);
  transform: rotate(90deg);
}

.modal-header {
  text-align: center;
  padding: 50px 40px 30px;
  background: linear-gradient(
    180deg,
    rgba(250, 249, 247, 0.8) 0%,
    transparent 100%
  );
  border-bottom: 1px solid rgba(201, 166, 107, 0.1);
}

.modal-brand {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.modal-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--brown);
  font-family: "Be Vietnam Pro", serif;
  letter-spacing: -0.5px;
}

.modal-body {
  padding: 32px 40px 40px;
}

.modal-form-group {
  margin-bottom: 24px;
  position: relative;
}

.modal-form-group input {
  width: 100%;
  padding: 18px 0;
  border: none;
  border-bottom: 2px solid #eee;
  font-size: 16px;
  font-family: inherit;
  background: transparent;
  transition: all 0.3s ease;
}

.modal-form-group input:focus {
  outline: none;
  border-bottom-color: var(--gold);
}

.modal-form-group input::placeholder {
  color: #aaa;
}

.modal-form-group input.error {
  border-bottom-color: #e53935;
  animation: shake 0.5s ease;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  20%,
  60% {
    transform: translateX(-5px);
  }
  40%,
  80% {
    transform: translateX(5px);
  }
}

/* Order Summary */
.order-summary {
  background: linear-gradient(145deg, #faf9f7, #f5f3f0);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: 28px;
  border: 1px solid rgba(201, 166, 107, 0.15);
}

.order-summary-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 20px;
}

.order-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(201, 166, 107, 0.15);
}

.order-item-info h4 {
  font-size: 17px;
  font-weight: 600;
  color: var(--brown);
  margin-bottom: 6px;
}

.order-item-details {
  font-size: 14px;
  color: var(--text-muted);
}

.order-item-price {
  font-size: 17px;
  font-weight: 700;
  color: var(--gold);
}

.order-total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
}

.order-total-label {
  font-size: 16px;
  font-weight: 600;
  color: var(--brown);
}

.order-total-price {
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--brown), var(--brown-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modal-submit-btn {
  width: 100%;
  padding: 20px 32px;
  background: var(--gradient-dark);
  color: var(--gold);
  border: 1px solid rgba(201, 166, 107, 0.2);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  margin-top: 28px;
  position: relative;
  overflow: hidden;
}

.modal-submit-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(201, 166, 107, 0.2),
    transparent
  );
  transition: left 0.5s ease;
}

.modal-submit-btn:hover {
  border-color: var(--gold);
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.modal-submit-btn:hover::before {
  left: 100%;
}

.modal-submit-btn .spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}

.modal-submit-btn.loading .spinner {
  display: block;
}

.modal-submit-btn.loading .btn-text {
  display: none;
}

@media (max-width: 640px) {
  .order-modal {
    margin: 10px;
    max-height: 95vh;
  }
  .modal-header {
    padding: 30px 24px 20px;
  }
  .modal-body {
    padding: 20px 24px 30px;
    padding-bottom: calc(30px + env(safe-area-inset-bottom));
  }
  .modal-title {
    font-size: 24px;
  }
}

/* Hidden old order panel */
.order-panel {
  display: none !important;
}

.order-panel-header {
  text-align: center;
  margin-bottom: 32px;
}

.order-panel-header h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--brown);
  margin-bottom: 8px;
}

.selected-product-display {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--white);
  padding: 12px 20px;
  border-radius: 50px;
  box-shadow: var(--shadow);
}

.selected-product-display img {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 8px;
}

.selected-product-display .info {
  text-align: left;
}

.selected-product-display .name {
  font-weight: 600;
  font-size: 14px;
  color: var(--brown);
}

.selected-product-display .color {
  font-size: 13px;
  color: var(--text-muted);
}

/* Size Selection */
.size-section {
  margin-bottom: 32px;
}

.size-label {
  font-size: 16px;
  font-weight: 600;
  color: var(--brown);
  margin-bottom: 16px;
  text-align: center;
}

.size-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.size-option {
  position: relative;
}

.size-option input {
  display: none;
}

.size-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 12px;
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.25s ease;
}

.size-btn:hover {
  border-color: var(--gold);
}

.size-option input:checked + .size-btn {
  border-color: var(--gold);
  background: linear-gradient(
    135deg,
    rgba(184, 149, 108, 0.08),
    rgba(184, 149, 108, 0.02)
  );
  box-shadow: 0 0 0 3px rgba(184, 149, 108, 0.12);
}

.size-btn .size {
  font-size: 16px;
  font-weight: 600;
  color: var(--brown);
  margin-bottom: 4px;
}

.size-btn .price {
  font-size: 14px;
  color: var(--gold);
  font-weight: 600;
}

@media (max-width: 640px) {
  .size-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .order-panel {
    padding: 24px;
  }
}

/* Price Display */
.price-display {
  text-align: center;
  padding: 24px;
  background: var(--white);
  border-radius: var(--radius);
  margin-bottom: 24px;
}

.price-display .label {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.price-display .total-price {
  font-size: 36px;
  font-weight: 700;
  color: var(--gold);
}

/* Contact Form */
.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

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

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

.form-group label {
  font-size: 14px;
  font-weight: 500;
  color: var(--brown);
}

.form-group label .required {
  color: #e53935;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  font-family: inherit;
  transition: border-color 0.25s ease;
  background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--gold);
}

.form-group input.error,
.form-group select.error {
  border-color: #e53935;
}

.form-group textarea {
  min-height: 80px;
  resize: vertical;
}

.submit-section {
  grid-column: 1 / -1;
  margin-top: 8px;
}

.submit-btn {
  width: 100%;
  padding: 18px 32px;
  font-size: 18px;
  background: linear-gradient(135deg, var(--gold), var(--gold-hover));
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(184, 149, 108, 0.4);
}

.submit-btn .spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.submit-btn.loading .spinner {
  display: block;
}

.submit-btn.loading .btn-text {
  display: none;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.form-benefits {
  grid-column: 1 / -1;
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.form-benefit {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

.form-benefit .icon {
  color: var(--success);
}

@media (max-width: 640px) {
  .contact-form {
    grid-template-columns: 1fr;
  }
  .form-benefits {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }
}

/* Honeypot */
.hp-field {
  position: absolute;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
}

/* Success Message */
.success-message {
  display: none;
  text-align: center;
  padding: 48px 24px;
}

.success-message.show {
  display: block;
}

.success-icon {
  width: 80px;
  height: 80px;
  background: var(--success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 40px;
  color: white;
}

.success-message h3 {
  font-size: 24px;
  color: var(--brown);
  margin-bottom: 12px;
}

.success-message p {
  color: var(--text-muted);
  margin-bottom: 24px;
  font-size: 16px;
}

.success-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

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

.zalo-btn:hover {
  background: #0055cc;
}

/* ===== BENEFITS ===== */
.benefits {
  padding: 120px 0;
  background: var(--brown);
  position: relative;
  overflow: hidden;
}

.benefits::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle,
    rgba(201, 166, 107, 0.03) 0%,
    transparent 50%
  );
  animation: float 15s ease-in-out infinite;
}

.benefits .section-header h2 {
  color: var(--white);
}

.benefits .section-header p {
  color: rgba(255, 255, 255, 0.7);
}

.benefits .section-header::after {
  background: var(--gradient-gold);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  position: relative;
  z-index: 2;
  justify-content: space-between;
}

.benefit-card {
  text-align: center;
  padding: 45px 28px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-xl);
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid rgba(201, 166, 107, 0.1);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.benefit-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-gold);
  transform: scaleX(0);
  transition: transform 0.5s ease;
}

.benefit-card:hover {
  transform: translateY(-10px);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(201, 166, 107, 0.3);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

.benefit-card:hover::before {
  transform: scaleX(1);
}

.benefit-card a {
  display: inline-block;
  margin-top: 10px;
  color: var(--gold);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  font-size: 14px;
}

.benefit-card a:hover {
  color: var(--gold-light);
  transform: translateX(5px);
}

.benefit-icon {
  width: 80px;
  height: 80px;
  background: var(--gradient-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 36px;
  color: var(--brown);
  box-shadow: 0 10px 30px rgba(201, 166, 107, 0.3);
  transition: all 0.5s ease;
}

.benefit-card:hover .benefit-icon {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 15px 40px rgba(201, 166, 107, 0.4);
}

.benefit-card h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}

.benefit-card p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

@media (max-width: 968px) {
  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 640px) {
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  .benefit-card {
    padding: 35px 24px;
  }
}

/* ===== FEEDBACK ===== */
.feedback {
  padding: 120px 0;
  background: linear-gradient(
    180deg,
    var(--white) 0%,
    var(--bg-light) 100%
  );
  position: relative;
}

.feedback-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feedback-card {
  background: var(--white);
  padding: 40px 32px;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(201, 166, 107, 0.1);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.feedback-card::before {
  content: '"';
  position: absolute;
  top: 20px;
  right: 30px;
  font-size: 120px;
  font-family: Georgia, serif;
  color: rgba(201, 166, 107, 0.08);
  line-height: 1;
}

.feedback-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.12);
  border-color: rgba(201, 166, 107, 0.3);
}

.feedback-stars {
  color: #ffb800;
  font-size: 20px;
  margin-bottom: 20px;
  letter-spacing: 3px;
}

.feedback-text {
  color: var(--text);
  margin-bottom: 28px;
  font-style: italic;
  line-height: 1.8;
  font-size: 16px;
  position: relative;
  z-index: 2;
}

.feedback-author {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.feedback-avatar {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--gradient-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--brown);
  font-size: 16px;
  box-shadow: 0 4px 15px rgba(201, 166, 107, 0.3);
}

.feedback-name {
  font-weight: 700;
  color: var(--brown);
  font-size: 16px;
  margin-bottom: 2px;
}

.feedback-location {
  font-size: 14px;
  color: var(--text-muted);
}

@media (max-width: 968px) {
  .feedback-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
}

/* ===== FAQ ===== */
.faq {
  padding: 120px 0;
  background: var(--bg-light);
  position: relative;
}

.faq::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(201, 166, 107, 0.3),
    transparent
  );
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  overflow: hidden;
  border: 1px solid transparent;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.faq-item:hover {
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.faq-item.active {
  border-color: rgba(201, 166, 107, 0.3);
  box-shadow: 0 10px 40px rgba(201, 166, 107, 0.15);
}

.faq-question {
  width: 100%;
  padding: 26px 32px;
  background: transparent;
  border: none;
  text-align: left;
  font-size: 17px;
  font-weight: 600;
  color: var(--brown);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: inherit;
  transition: all 0.3s ease;
  gap: 20px;
}

.faq-question:hover {
  color: var(--gold);
}

.faq-question::after {
  content: "+";
  font-size: 28px;
  color: var(--gold);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(201, 166, 107, 0.1);
  border-radius: 50%;
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
  background: var(--gold);
  color: var(--brown);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.faq-answer-content {
  padding: 0 32px 28px;
  color: var(--text-muted);
  line-height: 1.8;
  font-size: 15px;
}

.faq-item.active .faq-answer {
  max-height: 250px;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-dark);
  color: var(--white);
  padding: 80px 0 32px;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-gold);
}

.footer::after {
  content: "";
  position: absolute;
  top: 0;
  right: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(
    circle,
    rgba(201, 166, 107, 0.03) 0%,
    transparent 60%
  );
  pointer-events: none;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 50px;
  position: relative;
  z-index: 2;
}

.footer-brand h4 {
  font-size: 32px;
  margin-bottom: 18px;
  font-weight: 700;
}

.footer-brand h4 span {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
  font-size: 15px;
  max-width: 350px;
}

.footer-section h5 {
  font-size: 14px;
  margin-bottom: 24px;
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 600;
}

.footer-section a,
.footer-section p {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 14px;
  font-size: 15px;
  transition: all 0.3s ease;
}

.footer-section a:hover {
  color: var(--gold);
  transform: translateX(5px);
}

.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.4);
  font-size: 14px;
}

@media (max-width: 768px) {
  .footer {
    padding: 60px 0 24px;
  }
  .footer-content {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  .footer-brand p {
    max-width: none;
  }
  .footer-section a,
  .footer-section p {
    justify-content: center;
  }
  .footer-section a:hover {
    transform: none;
  }
}

/* ===== STICKY CTA ===== */
.sticky-cta {
  display: block;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  padding: 16px 20px;
  box-shadow: 0 -8px 30px rgba(0, 0, 0, 0.12);
  z-index: 999;
  border-top: 1px solid rgba(201, 166, 107, 0.1);
}

.sticky-cta .btn {
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  animation: glow 2s infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 16px 20px;
}

.sticky-cta .cta-text {
  font-weight: 700;
}

.sticky-cta .cta-divider {
  margin: 0 8px;
  opacity: 0.7;
}

.sticky-cta .cta-price {
  font-weight: 800;
  font-size: 1.1rem;
  color: #c92a2a;
}

body {
  padding-bottom: 90px;
}

@media (max-width: 768px) {
  .sticky-cta {
    display: block;
  }
}

/* ===== TOAST ===== */
.toast {
  position: fixed;
  top: 100px;
  right: 20px;
  padding: 18px 28px;
  background: var(--brown);
  color: white;
  border-radius: var(--radius);
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.25);
  transform: translateX(150%);
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 2000;
  max-width: 360px;
  font-size: 15px;
  font-weight: 500;
  border-left: 4px solid var(--gold);
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  background: linear-gradient(135deg, #059669, #10b981);
  border-left-color: #34d399;
}

.toast.error {
  background: linear-gradient(135deg, #dc2626, #ef4444);
  border-left-color: #f87171;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
  background: var(--gold);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gold-hover);
}

/* ===== SELECTION ===== */
::selection {
  background: var(--gold);
  color: var(--brown);
}

/* ===== SIZE OVERVIEW RESPONSIVE ===== */
@media (max-width: 768px) {
  .size-overview-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 16px !important;
  }
  .size-overview-grid > div > div:first-child {
    font-size: 28px !important;
  }
  .size-overview-grid > div > div:last-child {
    font-size: 13px !important;
  }
}

/* ===== MOBILE RESPONSIVE ===== */
@media (max-width: 480px) {
  /* Container */
  .container {
    padding: 0 16px;
  }

  /* Section Headers */
  .section-header {
    margin-bottom: 40px;
  }

  .section-header h2 {
    font-size: 26px;
    line-height: 1.3;
  }

  .section-header p {
    font-size: 14px;
  }

  .section-header::after {
    bottom: -15px;
    width: 50px;
  }

  /* Buttons */
  .btn {
    padding: 14px 28px;
    font-size: 14px;
  }

  /* Header Mobile */
  .header {
    padding: 10px 0;
  }

  .header.scrolled {
    padding: 8px 0;
  }

  .logo img {
    height: 50px;
  }

  .hotline-icon {
    width: 38px;
    height: 38px;
    font-size: 16px;
  }

  /* Hero Mobile */
  .hero-banner {
    min-height: 85vh;
    padding-top: 60px;
  }

  .hero-content {
    padding: 40px 16px;
  }

  .hero-logo {
    max-width: 180px;
    margin-bottom: 20px;
  }

  .hero-tagline {
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 25px;
    padding: 0 10px;
  }

  .hero-cta .btn {
    width: 100%;
    padding: 16px 24px;
  }

  /* Product Section Mobile */
  .product-section {
    padding: 60px 0;
  }

  .product-section > .container {
    padding: 0 8px;
  }

  .product-display {
    gap: 20px;
    margin-bottom: 40px;
  }

  .main-product-image {
    border-radius: var(--radius);
    margin-bottom: 10px;
    margin-left: -8px;
    margin-right: -8px;
    width: calc(100% + 16px);
  }

  .main-product-image img {
    height: auto;
    padding: 0;
    border-radius: var(--radius);
  }

  .thumbnail-images {
    gap: 8px;
  }

  .thumbnail {
    border-radius: 10px;
  }

  .thumbnail img {
    height: 70px;
    padding: 6px;
  }

  .product-details {
    padding: 15px 0;
  }

  .product-name {
    font-size: 1.5rem !important;
    margin-bottom: 20px;
  }

  .product-name::after {
    bottom: -8px;
    width: 40px;
    height: 2px;
  }

  .section-label {
    font-size: 0.8rem;
    margin-bottom: 12px;
  }

  .color-section {
    margin-bottom: 25px;
  }

  .color-options {
    gap: 12px;
  }

  .color-dot-option {
    width: 44px;
    height: 44px;
  }

  .color-dot-option.active::after {
    font-size: 14px;
  }

  .product-description {
    font-size: 0.9rem;
    padding: 15px;
    margin-bottom: 25px;
    line-height: 1.7;
  }

  .price-section {
    padding: 18px;
    gap: 12px;
    margin-bottom: 25px;
    flex-direction: column;
    align-items: flex-start;
  }

  .price-old {
    font-size: 1rem;
  }

  .price-current {
    font-size: 2rem !important;
  }

  .price-badge {
    padding: 6px 14px;
    font-size: 0.75rem;
  }

  .model-section {
    margin-bottom: 25px;
  }

  .model-buttons {
    gap: 10px;
  }

  .model-btn {
    padding: 14px 20px;
    font-size: 0.9rem;
    flex: 1;
    min-width: calc(50% - 5px);
    text-align: center;
  }

  .cta-section {
    margin-top: 25px;
  }

  .btn-cta {
    padding: 18px 24px;
    font-size: 1rem;
  }

  /* Benefits Mobile */
  .benefits {
    padding: 60px 0;
  }

  .benefits-grid {
    gap: 16px;
  }

  .benefit-card {
    padding: 28px 20px;
    border-radius: var(--radius-lg);
  }

  .benefit-icon {
    width: 60px;
    height: 60px;
    font-size: 28px;
    margin-bottom: 16px;
  }

  .benefit-card h4 {
    font-size: 15px;
    margin-bottom: 8px;
  }

  .benefit-card p {
    font-size: 13px;
  }

  /* Feedback Mobile */
  .feedback {
    padding: 60px 0;
  }

  .feedback-card {
    padding: 28px 20px;
    border-radius: var(--radius-lg);
  }

  .feedback-card::before {
    font-size: 80px;
    top: 10px;
    right: 15px;
  }

  .feedback-stars {
    font-size: 16px;
    margin-bottom: 14px;
  }

  .feedback-text {
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.7;
  }

  .feedback-author {
    gap: 12px;
    padding-top: 16px;
  }

  .feedback-avatar {
    width: 44px;
    height: 44px;
    font-size: 14px;
  }

  .feedback-name {
    font-size: 14px;
  }

  .feedback-location {
    font-size: 12px;
  }

  /* FAQ Mobile */
  .faq {
    padding: 60px 0;
  }

  .faq-item {
    margin-bottom: 12px;
    border-radius: var(--radius);
  }

  .faq-question {
    padding: 18px 20px;
    font-size: 14px;
    gap: 12px;
  }

  .faq-question::after {
    width: 32px;
    height: 32px;
    font-size: 20px;
  }

  .faq-answer-content {
    padding: 0 20px 20px;
    font-size: 13px;
  }

  /* Footer Mobile */
  .footer {
    padding: 50px 0 20px;
  }

  .footer-content {
    gap: 30px;
    margin-bottom: 30px;
  }

  .footer-brand h4 {
    font-size: 24px;
  }

  .footer-brand p {
    font-size: 13px;
  }

  .footer-section h5 {
    font-size: 12px;
    margin-bottom: 16px;
  }

  .footer-section a,
  .footer-section p {
    font-size: 13px;
    margin-bottom: 10px;
  }

  .footer-bottom {
    font-size: 12px;
    padding-top: 20px;
  }

  /* Modal Mobile */
  .order-modal-overlay {
    padding: 12px;
    align-items: flex-end;
  }

  .order-modal {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    max-height: 95vh;
  }

  .modal-close {
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    font-size: 20px;
  }

  .modal-header {
    padding: 35px 20px 20px;
  }

  .modal-brand {
    font-size: 10px;
    letter-spacing: 3px;
  }

  .modal-title {
    font-size: 22px;
  }

  .modal-body {
    padding: 20px;
  }

  .modal-form-group {
    margin-bottom: 18px;
  }

  .modal-form-group input {
    padding: 14px 0;
    font-size: 15px;
  }

  .order-summary {
    padding: 20px;
    margin-top: 20px;
    border-radius: var(--radius);
  }

  .order-summary-title {
    font-size: 10px;
    margin-bottom: 14px;
  }

  .order-item-info h4 {
    font-size: 14px;
  }

  .order-item-details {
    font-size: 12px;
  }

  .order-item-price {
    font-size: 14px;
  }

  .order-total-label {
    font-size: 14px;
  }

  .order-total-price {
    font-size: 20px;
  }

  .modal-submit-btn {
    padding: 16px 24px;
    font-size: 13px;
    margin-top: 20px;
  }

  /* Sticky CTA Mobile */
  .sticky-cta {
    padding: 12px 16px;
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
  }

  .sticky-cta .btn {
    padding: 14px 20px;
    font-size: 14px;
  }

  /* Toast Mobile */
  .toast {
    top: auto;
    bottom: 100px;
    right: 12px;
    left: 12px;
    max-width: none;
    padding: 14px 18px;
    font-size: 13px;
  }

  /* Order Panel Mobile */
  .order-panel {
    padding: 20px;
    margin-top: 25px;
  }

  .order-panel-header h3 {
    font-size: 20px;
  }

  .size-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .size-btn {
    padding: 14px 10px;
  }

  .size-btn .size {
    font-size: 14px;
  }

  .size-btn .price {
    font-size: 12px;
  }

  .price-display {
    padding: 18px;
  }

  .price-display .total-price {
    font-size: 28px;
  }

  .contact-form {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .form-group input,
  .form-group select,
  .form-group textarea {
    padding: 12px 14px;
    font-size: 15px;
  }

  .submit-btn {
    padding: 16px 24px;
    font-size: 16px;
  }

  .form-benefits {
    flex-direction: column;
    gap: 10px;
  }

  .form-benefit {
    font-size: 13px;
  }

  .success-icon {
    width: 70px;
    height: 70px;
    font-size: 34px;
  }

  .success-message h3 {
    font-size: 20px;
  }

  .success-message p {
    font-size: 14px;
  }
}

/* Extra small phones */
@media (max-width: 360px) {
  .hero-logo {
    max-width: 150px;
  }

  .hero-tagline {
    font-size: 0.85rem;
  }

  .product-name {
    font-size: 1.3rem !important;
  }

  .price-current {
    font-size: 1.75rem !important;
  }

  .model-btn {
    min-width: 100%;
  }

  .color-dot-option {
    width: 40px;
    height: 40px;
  }

  .section-header h2 {
    font-size: 22px;
  }

  /* Order Panel Extra Small */
  .order-panel {
    padding: 16px;
  }

  .order-panel-header h3 {
    font-size: 18px;
  }

  .size-label {
    font-size: 14px;
  }

  .size-btn {
    padding: 12px 8px;
  }

  .size-btn .size {
    font-size: 13px;
  }

  .size-btn .price {
    font-size: 11px;
  }

  .price-display .total-price {
    font-size: 24px;
  }

  .form-group label {
    font-size: 13px;
  }

  .form-group input,
  .form-group select,
  .form-group textarea {
    padding: 11px 12px;
    font-size: 14px;
  }

  .submit-btn {
    padding: 14px 20px;
    font-size: 15px;
  }
}


/* ===== FIX AUTO-ZOOM ON MOBILE ===== */
/* Đảm bảo tất cả input, select, textarea có font-size tối thiểu 16px để tránh auto-zoom trên iOS */
@media (max-width: 768px) {
  input,
  select,
  textarea,
  button {
    font-size: 16px !important;
  }
  
  /* Đảm bảo các input trong form không bị zoom */
  .form-group input,
  .form-group select,
  .form-group textarea,
  .modal-form-group input {
    font-size: 16px !important;
  }
}

/* Ngăn double-tap zoom trên iOS */
* {
  touch-action: manipulation;
}

/* Cho phép scroll ngang cho slider */
.thumbnail-slider,
.thumbnail-slider * {
  touch-action: pan-x !important;
}


/* Size Section on Right (Desktop) */
.size-section-right {
  margin-bottom: 0;
}

.size-section-right .section-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
  text-align: center;
}

.size-section-right .size-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  justify-items: center;
}

.size-section-right .size-option {
  width: 100%;
}

/* Hide size-section-right on mobile, show size-section-below-image */
@media (max-width: 968px) {
  .size-section-right {
    display: none;
  }
}

/* Show size-section-below-image only on mobile */
@media (min-width: 969px) {
  .size-section-below-image {
    display: none;
  }
}


/* ===== PREVENT ZOOM AND OVERFLOW ON MOBILE ===== */
html, body {
  overflow-x: hidden;
  position: relative;
  width: 100%;
}

/* Đảm bảo images không vượt quá container */
img {
  max-width: 100%;
  height: auto;
}

/* Ngăn zoom khi double tap */
a, button, input, select, textarea {
  touch-action: manipulation;
}

/* Override cho slider để vẫn có thể swipe */
.thumbnail-slider,
.thumbnail-slider *,
.thumbnail-images,
.thumbnail {
  touch-action: pan-x !important;
}

/* Đảm bảo container không vượt quá viewport */
.container {
  max-width: 100%;
  box-sizing: border-box;
}

/* Ngăn các section gây overflow */
section {
  overflow-x: hidden;
}