:root {
  --bg-color: #0a0a0a;
  --text-color: #e0e0e0;
  --accent-color: #d4af37;
  --border-color: #333333;
  --card-bg: #121212;
  --desc-color: #999999;
  --btn-text-color: #000000;
  --category-active-bg: rgba(255, 255, 255, 0.1);
  --card-shadow: #000000;
  --border-radius: 12px;
  --font-serif: 'Playfair Display', serif;
  --font-sans: 'Montserrat', sans-serif;
  --header-bg: rgba(10, 10, 10, 0.95);
  --modal-bg: rgba(0, 0, 0, 0.85);
  --btn-promo-text: #000000;
  --btn-promo-border: #d4af37;
  --btn-back-text: #000000;
  --btn-back-bg: #d4af37;
  --modal-max-width: 500px;
  --btn-back-shadow: rgba(212, 175, 55, 0.4);
  --btn-back-shadow-hover: rgba(212, 175, 55, 0.6);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.no-scroll {
  overflow: hidden;
  position: fixed;
  width: 100%;
  height: 100%;
}

.header {
  padding: 0.5rem 1.5rem;
  padding-top: calc(0.5rem + env(safe-area-inset-top, 20px));
  text-align: center;
  position: sticky;
  top: 0;
  background-color: var(--header-bg);
  backdrop-filter: blur(10px);
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
}

.logo {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent-color);
  letter-spacing: 6px;
  margin-bottom: 0;
  text-transform: uppercase;
}

.category-nav {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  overflow-x: auto;
  padding-bottom: 0;
  scrollbar-width: none; /* Firefox */
}

.category-nav::-webkit-scrollbar {
  display: none; /* Safari and Chrome */
}

.category-btn {
  font-family: var(--font-sans);
  background: transparent;
  color: var(--text-color);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1.2rem;
  border-radius: 30px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
  letter-spacing: 1px;
}

.category-btn.active, .category-btn:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  background-color: var(--category-active-bg);
}

.main-content {
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.menu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-flow: dense;
  gap: 1.5rem;
}

.menu-item {
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 12px var(--card-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  position: relative;
}

.menu-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px var(--card-shadow);
  border-color: var(--accent-color);
}

.item-image {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background-color: transparent;
  display: block;
  flex-grow: 1;
}

.item-info {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  justify-content: flex-start;
}

.item-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-color);
  letter-spacing: 1px;
  line-height: 1.3;
}

.item-description {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--desc-color);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 0;
}

.item-price {
  font-family: var(--font-sans);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-color);
  letter-spacing: 0.5px;
}

/* Grid Span Classes */
.grid-2x1 { grid-column: span 2; }
.grid-1x2 { grid-row: span 2; }
.grid-2x2 { grid-column: span 2; grid-row: span 2; }
.grid-3x2 { grid-column: span 3; grid-row: span 2; }

/* Out of stock */
.out-of-stock {
  opacity: 0.5;
  filter: grayscale(80%);
  pointer-events: none;
}
.out-of-stock::after {
  content: 'HẾT HÀNG';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-15deg);
  background-color: rgba(255, 0, 0, 0.8);
  color: white;
  padding: 0.5rem 1rem;
  font-size: 1.5rem;
  font-weight: 900;
  border: 3px solid white;
  border-radius: 8px;
  z-index: 10;
  letter-spacing: 2px;
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--modal-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  will-change: opacity, backdrop-filter;
  transform: translateZ(0);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-color);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  overflow: hidden;
  width: 90%;
  max-width: var(--modal-max-width);
  max-height: 90vh;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  transform: translateY(20px);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.close-btn {
  position: absolute;
  top: 2rem;
  right: 2rem;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-color);
  border: none;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 1010;
  transition: background 0.3s, color 0.3s;
}

.close-btn:hover {
  background: var(--accent-color);
  color: var(--bg-color);
}

.modal-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background-color: transparent;
  display: block;
}

.modal-info {
  padding: 2rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  justify-content: flex-start;
}

.modal-name {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  color: var(--text-color);
  letter-spacing: 1px;
}

.modal-price {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color);
  letter-spacing: 0.5px;
}

.modal-description {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  color: var(--desc-color);
  line-height: 1.8;
  white-space: pre-wrap;
  max-height: 150px;
  overflow-y: auto;
  padding-right: 10px;
}

.modal-description::-webkit-scrollbar { width: 4px; }
.modal-description::-webkit-scrollbar-track { background: rgba(255,255,255,0.05); border-radius: 4px; }
.modal-description::-webkit-scrollbar-thumb { background: var(--accent-color); border-radius: 4px; }

/* Screensaver */
.screensaver {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100svh;
  background-color: #000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
  z-index: 9999;
}

.screensaver.show {
  opacity: 1;
  pointer-events: auto;
}

.promo-container {
  width: 100%;
  height: 100%;
  position: relative;
}

.promo-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100svh;
  opacity: 0;
  transition: opacity 1s ease-in-out;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.promo-slide.active {
  opacity: 1;
}

.promo-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.promo-overlay {
  position: relative;
  z-index: 2;
  padding: 10rem 4rem calc(12rem + env(safe-area-inset-bottom));
  background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.5) 50%, transparent 100%);
}

.promo-badge {
  display: inline-block;
  background-color: var(--accent-color);
  color: #000;
  padding: 0.5rem 1.5rem;
  border-radius: 30px;
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.promo-name {
  font-family: var(--font-serif);
  font-size: 4rem;
  color: #fff;
  margin-bottom: 1rem;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.promo-price {
  font-family: var(--font-sans);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-color);
  text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.screensaver-footer {
  position: absolute;
  bottom: 2rem;
  left: 0;
  width: 100%;
  text-align: center;
  z-index: 10001;
}

.screensaver-tap-text {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.8);
  letter-spacing: 2px;
  text-transform: uppercase;
  animation: pulse-text 2s infinite ease-in-out;
}

@keyframes pulse-text {
  0% { opacity: 0.5; }
  50% { opacity: 1; }
  100% { opacity: 0.5; }
}

/* View Transition API */
::view-transition-old(hero-image),
::view-transition-new(hero-image) {
  animation-duration: 0.4s;
  animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  mix-blend-mode: normal;
}

/* New Buttons Style */
.btn-promo {
  font-family: var(--font-sans);
  background: transparent;
  color: var(--btn-promo-text);
  border: 1px solid var(--btn-promo-border);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
  background-size: cover;
  background-position: center;
}

.btn-promo:hover {
  background: var(--btn-promo-border);
}

.btn-back-menu {
  font-family: var(--font-sans);
  background: var(--btn-back-bg);
  color: var(--btn-back-text);
  border: none;
  padding: 1rem 3rem;
  border-radius: 40px;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 2px;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 4px 15px var(--btn-back-shadow);
  background-size: cover;
  background-position: center;
  }

.btn-back-menu:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--btn-back-shadow-hover);
}

.promo-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.5);
  color: white;
  border: none;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s;
}

.promo-nav:hover {
  background: var(--accent-color);
}

#promo-prev {
  left: 2rem;
}

#promo-next {
  right: 2rem;
}

/* Dots */
.promo-dots {
  position: absolute;
  bottom: 100px;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: center;
  gap: 10px;
  z-index: 10000;
}
.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  cursor: pointer;
  transition: 0.3s;
}
.dot.active {
  background: var(--accent-color);
}

/* ================= GLOBAL ORIENTATION GRID ================= */
@media (orientation: portrait) { .menu-grid { grid-template-columns: repeat(3, 1fr) !important; } }
@media (orientation: landscape) { .menu-grid { grid-template-columns: repeat(4, 1fr) !important; } }

/* ================= MOBILE RESPONSIVE ================= */
@media (max-width: 767px) {
  /* Tối ưu Header xếp dọc */
  .header-top { flex-direction: column; align-items: center; gap: 0.8rem; }
  .header-actions { flex-direction: column; width: 100%; gap: 0.5rem; }
  .search-container { width: 100%; }
  .search-container input { width: 100%; }
  .logo { font-size: 1.8rem; letter-spacing: 3px; }
  
  /* Tối ưu lưới hiển thị */
  .main-content { padding: 1rem; }
  .menu-grid { gap: 0.5rem; }
  
  /* Giảm size chữ và Padding cho thẻ món ăn 1 cột Mobile */
  .item-image { aspect-ratio: 3 / 4; }
  .item-name { font-size: 0.75rem; line-height: 1.1; letter-spacing: 0; margin-bottom: 0.1rem; }
  .item-price { font-size: 0.8rem; }
  .item-description {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.65rem;
    line-height: 1.3;
    margin-top: 0.15rem;
  }
  .item-info { padding: 0.5rem 0.4rem; gap: 0.3rem; }
  .out-of-stock::after { font-size: 0.6rem; padding: 0.2rem; border-width: 2px; }
  
  /* Ép cân Màn hình chờ (Screensaver) */
  .promo-name { font-size: 2rem; }
  .promo-price { font-size: 1.5rem; }
  .promo-overlay { padding: 5rem 1.5rem calc(8rem + env(safe-area-inset-bottom)); }
  .btn-back-menu { padding: 0.8rem 1.5rem; font-size: 1rem; width: 80%; }
  .screensaver-tap-text { font-size: 1rem; }
  
  /* Tối ưu Modal chi tiết món */
  .modal-content { width: 85%; max-height: 75vh; margin: auto; }
  .modal-image { aspect-ratio: 1 / 1; }
  .modal-name { font-size: 1.5rem; }
  .modal-price { font-size: 1.2rem; }
  .modal-info { padding: 1.5rem; }
  
  /* Thu nhỏ các nút điều hướng */
  .promo-nav { width: 40px; height: 40px; font-size: 1rem; }
  #promo-prev { left: 1rem; }
  #promo-next { right: 1rem; }

  /* Cho phép thanh danh mục cuộn cuộn mượt hơn trên iOS */
  .category-nav, .sub-category-nav { 
    justify-content: flex-start; 
    padding: 0.5rem; 
    -webkit-overflow-scrolling: touch; 
  }
  
  /* Nút danh mục nhỏ lại một chút nữa */
  .category-btn { font-size: 0.85rem; padding: 0.4rem 1rem; }
  
  /* Dấu X đóng modal to ra, dễ bấm hơn */
  .close-btn { 
    width: 50px; 
    height: 50px; 
    top: 1rem; 
    right: 1rem; 
    font-size: 2rem; 
    background: rgba(0,0,0,0.5); /* Tăng độ tương phản */
  }
}