/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 32px;
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  border-radius: var(--radius-none);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

/* Cobra Bite Primary Button */
.btn-primary {
  background-color: var(--co-white);
  color: var(--co-black-deep);
  border: 1px solid var(--co-white);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background-color: var(--co-green-neon);
  transition: left var(--transition-normal);
  z-index: -1;
  transform: skewX(-15deg);
}
.btn-primary:hover::before {
  left: 0;
  transform: skewX(0);
}
.btn-primary:hover {
  color: var(--co-black-deep);
  border-color: var(--co-green-neon);
  box-shadow: var(--shadow-neon);
}

/* Secondary / Outline Button */
.btn-outline {
  background-color: transparent;
  color: var(--co-white);
  border: 1px solid var(--co-gray-dark);
}
.btn-outline:hover {
  border-color: var(--co-white);
  background-color: var(--co-surface-light);
}

/* ==========================================================================
   Header & Mega Menu
   ========================================================================== */
.header {
  position: fixed;
  top: var(--banner-height);
  width: 100%;
  height: var(--header-height);
  background-color: rgba(5, 5, 5, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--co-black-surface-light);
  transition: transform var(--transition-normal);
}

.header-inner {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--co-white);
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo span {
  color: var(--co-green-neon);
}

.nav-links {
  display: flex;
  gap: var(--spacing-xl);
}

.nav-item {
  font-family: var(--font-heading);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 1rem;
  letter-spacing: 1px;
  position: relative;
  padding: 28px 0;
}

.nav-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background-color: var(--co-green-neon);
  transition: width var(--transition-normal);
  box-shadow: 0 -2px 5px var(--co-green-glow);
}
.nav-item:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.action-icon {
  background: none;
  border: none;
  color: var(--co-white);
  font-size: 1.2rem;
  transition: color var(--transition-fast);
}
.action-icon:hover {
  color: var(--co-green-neon);
}

/* Mega Menu */
.nav-item-dropdown {
  position: static; /* Needs to be static so mega menu can be relative to the header acting as container */
}

.mega-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: var(--co-black-surface);
  border-top: 1px solid var(--co-green-neon);
  box-shadow: 0 10px 30px rgba(0,0,0,0.8);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  display: flex;
  justify-content: center;
  padding: var(--spacing-2xl) 0;
  z-index: 100;
}

.nav-item-dropdown:hover .mega-menu {
  opacity: 1;
  visibility: visible;
}

.mega-menu-inner {
  display: flex;
  gap: var(--spacing-4xl);
  max-width: 1200px;
  width: 100%;
  padding: 0 var(--spacing-lg);
}

.mega-col h4 {
  color: var(--co-white);
  margin-bottom: var(--spacing-md);
  font-size: 1.1rem;
  text-transform: uppercase;
}

.mega-col ul li {
  margin-bottom: var(--spacing-sm);
}
.mega-col ul li a {
  color: var(--co-gray-muted);
  font-family: var(--font-primary);
  font-size: 0.95rem;
  font-weight: 400;
  text-transform: none;
  display: block;
  padding: 4px 0;
}
.mega-col ul li a:hover {
  color: var(--co-green-neon);
}

/* ==========================================================================
   Product Cards (Grid)
   ========================================================================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.product-card {
  position: relative;
  background: var(--co-black-surface);
  border: 1px solid transparent;
  transition: all var(--transition-normal);
  cursor: pointer;
  overflow: hidden;
}

.product-card:hover {
  border-color: var(--co-black-surface-light);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

/* Kẻ sọc Neon mảnh khi hover (Rắn luồn lách) */
.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 0;
  background-color: var(--co-green-neon);
  transition: height var(--transition-normal);
  z-index: 2;
  box-shadow: var(--shadow-neon);
}
.product-card:hover::before {
  height: 100%;
}

.product-image-wrap {
  position: relative;
  aspect-ratio: 1/1; /* Vuông vắn nhãn hiệu lớn */
  overflow: hidden;
  background-color: var(--co-black-onyx);
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-image-wrap img {
  width: 80%;
  height: 80%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.product-card:hover .product-image-wrap img {
  transform: scale(1.05); /* Zoom in nhẹ */
}

.product-badge {
  position: absolute;
  top: var(--spacing-md);
  left: var(--spacing-md);
  background: var(--co-white);
  color: var(--co-black-deep);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 8px;
  text-transform: uppercase;
  z-index: 2;
}

.product-badge.new {
  background: var(--co-green-neon);
}

.product-info {
  padding: var(--spacing-md);
}

.product-category {
  font-size: 0.85rem;
  color: var(--co-gray-muted);
  text-transform: uppercase;
  margin-bottom: var(--spacing-xs);
  display: block;
}

.product-title {
  font-family: var(--font-primary);
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.product-price {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
}

/* Quick add button (appears on hover) */
.product-quick-add {
  position: absolute;
  bottom: -50px;
  left: 0;
  width: 100%;
  background: rgba(0, 255, 0, 0.9);
  color: var(--co-black-deep);
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  padding: 12px 0;
  border: none;
  font-size: 0.9rem;
  transition: bottom var(--transition-fast);
  z-index: 3;
}
.product-card:hover .product-quick-add {
  bottom: 0;
}
.product-quick-add:hover {
  background: var(--co-white);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background-color: var(--co-black-surface);
  padding: var(--spacing-4xl) 0 var(--spacing-xl);
  border-top: 1px solid var(--co-black-surface-light);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-3xl);
}

@media (max-width: 992px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 576px) {
  .footer-grid { grid-template-columns: 1fr; }
}

.footer-col h4 {
  margin-bottom: var(--spacing-lg);
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--co-gray-muted);
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--co-white);
}

.footer-bottom {
  border-top: 1px solid var(--co-black-surface-light);
  padding-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--co-gray-muted);
  font-size: 0.85rem;
}

/* ==========================================================================
   Sales & FOMO Elements
   ========================================================================== */

/* Top Promo Banner */
.top-promo-banner {
  background-color: var(--co-green-neon);
  color: var(--co-black-deep);
  text-align: center;
  height: var(--banner-height);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  z-index: 1001;
  position: fixed;
  top: 0;
  width: 100%;
}

/* FOMO Badges */
.product-badge.fomo {
  background: red;
  color: white;
  animation: pulse-red 2s infinite;
}

@keyframes pulse-red {
  0% { box-shadow: 0 0 0 0 rgba(255, 0, 0, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(255, 0, 0, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 0, 0, 0); }
}

/* Slide-out Cart Popup (AJAX) */
.cart-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.cart-overlay.active {
  opacity: 1;
  visibility: visible;
}

.cart-popup {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  height: 100vh;
  background-color: var(--co-black-surface);
  border-left: 1px solid var(--co-green-neon);
  z-index: 2001;
  box-shadow: -10px 0 30px rgba(0,255,0,0.1);
  transition: right var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.cart-popup.active {
  right: 0;
}

@media (max-width: 500px) {
  .cart-popup { width: 100vw; right: -100vw; }
}

.cart-header {
  padding: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--co-black-surface-light);
}

.cart-title {
  font-family: var(--font-heading);
  text-transform: uppercase;
  font-size: 1.2rem;
  margin: 0;
}

.cart-close {
  background: none;
  border: none;
  color: var(--co-white);
  font-size: 1.5rem;
  cursor: pointer;
}
.cart-close:hover { color: var(--co-green-neon); }

.cart-body {
  flex-grow: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.cart-success-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--co-green-neon);
  color: var(--co-black-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
  border: 4px solid rgba(0,255,0,0.3);
}

.cart-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--co-black-surface-light);
}

/* Modal Core (Size Guide) */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(5px);
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}
.modal-content {
  background: var(--co-black-surface);
  width: 90%;
  max-width: 600px;
  padding: var(--spacing-2xl);
  position: relative;
  border: 1px solid var(--co-black-surface-light);
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}
.modal-overlay.active .modal-content {
  transform: translateY(0);
}
.modal-close {
  position: absolute;
  top: 15px;
  right: 15px;
}

/* Section specific styling */
.about-founder {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
}
.founder-image {
  border: 2px solid var(--co-black-surface-light);
  position: relative;
}
.founder-image::after {
  content: '';
  position: absolute;
  bottom: -20px;
  right: -20px;
  width: 100%;
  height: 100%;
  border: 2px solid var(--co-green-neon);
  z-index: -1;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}
.review-card {
  background: var(--co-black-surface);
  padding: var(--spacing-xl);
  border-left: 2px solid var(--co-green-neon);
}
.review-stars { color: gold; margin-bottom: var(--spacing-sm); }
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: var(--spacing-md);
}
.review-author img {
  width: 40px; height: 40px; border-radius: 50%; object-fit: cover;
}


/* ==========================================================================
   Mobile Nav Fixes
   ========================================================================== */
@media (max-width: 992px) {
  .header-inner {
    height: auto;
    flex-wrap: wrap;
    padding: 10px 0 0 0;
  }
  
  .logo {
    padding-left: var(--spacing-lg);
  }
  
  .header-actions {
    padding-right: var(--spacing-lg);
  }

  /* Hamburger Toggle */
  .hamburger {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 25px;
    height: 18px;
    cursor: pointer;
    z-index: 1001;
    margin-left: var(--spacing-md);
  }
  
  .hamburger span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--co-white);
    transition: all 0.3s ease;
  }

  .hamburger.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); background-color: var(--co-green-neon); }
  .hamburger.active span:nth-child(2) { opacity: 0; }
  .hamburger.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); background-color: var(--co-green-neon); }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--co-black-deep);
    border-left: 1px solid var(--co-black-surface-light);
    flex-direction: column;
    padding: 100px var(--spacing-lg) var(--spacing-lg);
    gap: var(--spacing-md);
    transition: right 0.4s cubic-bezier(0.19, 1, 0.22, 1);
    z-index: 999;
  }

  .nav-links.active {
    right: 0;
    box-shadow: -10px 0 40px rgba(0,0,0,0.8);
  }
  
  .nav-item {
    padding: 15px 0;
    font-size: 0.9rem;
  }
  
  /* Hide scrollbar for clean app-look */
  .nav-links::-webkit-scrollbar {
    display: none;
  }
  
  /* Make Mega Menu slightly better for mobile by turning it off or pushing it down */
  .mega-menu {
    display: none; /* Mobile will just use normal link clicking to generic PLP */
  }
}