/* ======================================
   MENU MOBILE RESPONSIVE - AFC.EDU.VN
   ====================================== */

:root {
  --header-height: 60px;
  --primary-color: #b0770c;
  --primary-dark: #8b5e09;
  --text-color: #333;
  --text-light: #666;
  --bg-overlay: rgba(0,0,0,.5);
  --border-color: #ddd;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  -webkit-tap-highlight-color: transparent;
}

/* ==================
   NÚT HAMBURGER
   ================== */
.mobile-nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  background: var(--primary-color);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
	margin: 0 20% 0 0;
}

.mobile-nav-toggle:hover {
  background: var(--primary-dark);
  transform: scale(1.05);
}

.mobile-nav-toggle:active {
  transform: scale(0.95);
}

.hamburger {
  position: relative;
  width: 24px;
  height: 18px;
  margin: 0 auto;
}

.hamburger span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 3px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.hamburger span:nth-child(3) { bottom: 0; }

/* Hamburger animation khi mở */
.mobile-nav-toggle.active .hamburger span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.mobile-nav-toggle.active .hamburger span:nth-child(2) {
  opacity: 0;
  transform: translateX(-100%);
}

.mobile-nav-toggle.active .hamburger span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* ==================
   MOBILE NAV PANEL
   ================== */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 320px;
  max-width: 85vw;
  height: calc(100vh - var(--header-height));
  background: #fff;
  box-shadow: 4px 0 12px rgba(0,0,0,.2);
  transform: translateX(-100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  z-index: 999;
  display: none;
}

.mobile-nav.open {
  transform: translateX(0);
}

/* ==================
   MENU ITEMS
   ================== */
.mobile-menu {
  list-style: none;
  margin: 0;
  padding: 16px 12px;
}

.mobile-menu > li {
  margin-bottom: 8px;
}

.mobile-menu > li > a,
.mobile-menu > li > .submenu-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 14px 16px;
  background: #f8f9fa;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-color);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  text-align: left;
}

.mobile-menu > li > a:hover,
.mobile-menu > li > .submenu-toggle:hover {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
  transform: translateX(4px);
}

.mobile-menu > li > a:active,
.mobile-menu > li > .submenu-toggle:active {
  transform: translateX(2px) scale(0.98);
}

/* Icon chevron cho submenu */
.submenu-toggle .chevron {
  font-size: 18px;
  color: var(--text-light);
  transition: transform 0.3s ease;
  user-select: none;
}

.submenu-toggle.active .chevron {
  transform: rotate(180deg);
  color: #fff;
}

/* ==================
   SUBMENU (Accordion)
   ================== */
.mobile-submenu {
  list-style: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-submenu.open {
  max-height: 800px; /* Đủ lớn cho nội dung */
  margin-top: 8px;
}

.mobile-submenu li {
  margin-bottom: 6px;
}

/* Tiêu đề nhóm submenu */
.mobile-submenu li.submenu-group-title {
  padding: 10px 16px;
  margin-top: 12px;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  border-radius: 8px;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 4px rgba(176, 119, 12, 0.2);
}

.mobile-submenu li.submenu-group-title:first-child {
  margin-top: 0;
}

.mobile-submenu li a {
  display: block;
  padding: 12px 16px 12px 32px;
  background: #fff;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  color: var(--text-color);
  font-size: 14px;
  text-decoration: none;
  transition: var(--transition);
  position: relative;
}

.mobile-submenu li a:before {
  content: '›';
  position: absolute;
  left: 16px;
  color: var(--primary-color);
  font-weight: bold;
  font-size: 18px;
  transition: var(--transition);
}

.mobile-submenu li a:hover {
  background: #fff5e6;
  border-color: var(--primary-color);
  color: var(--primary-color);
  padding-left: 36px;
}

.mobile-submenu li a:hover:before {
  left: 18px;
}

/* ==================
   BACKDROP (lớp phủ)
   ================== */
.mobile-backdrop {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100vw;
  height: calc(100vh - var(--header-height));
  background: var(--bg-overlay);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 998;
  display: none;
}

.mobile-backdrop.show {
  opacity: 1;
  visibility: visible;
}

/* Ngăn scroll body khi menu mở */
body.mobile-nav-open {
  overflow: hidden;
}

/* ==================
   RESPONSIVE
   ================== */
@media (max-width: 769px) {
  .mobile-nav-toggle {
    display: block;
  }
  
  .mobile-nav,
  .mobile-backdrop {
    display: block;
  }
  
  /* Ẩn menu desktop */
  #rm,
  .DynamicFileContents,
  #nava {
    display: none !important;
  }
  #bgleft,
  #bgright {
    display: none !important;
  }
.mobile-nav-toggle {
    margin: 0 10% 0 0;
}
}

/* Tablet */
@media (min-width: 768px) and (max-width: 1024px) {
  .mobile-nav-toggle {
    display: block;
  }
  
  .mobile-nav,
  .mobile-backdrop {
    display: block;
  }
  
  #rm,
  .DynamicFileContents {
    display: none !important;
  }
}

/* Desktop - ẩn mobile menu */
@media (min-width: 1025px) {
  .mobile-nav-toggle,
  .mobile-nav,
  .mobile-backdrop {
    display: none !important;
  }
}
@media (max-width: 426px) {
button.mobile-nav-toggle {
    width: 33px;
    height: 33px;
}
.hamburger {
    width: 19px;
    height: 16px;
}
.mobile-nav-toggle {
        margin: 0 10px 0 0;
}
}

/* ==================
   SCROLLBAR STYLING
   ================== */
.mobile-nav::-webkit-scrollbar {
  width: 6px;
}

.mobile-nav::-webkit-scrollbar-track {
  background: #f1f1f1;
}

.mobile-nav::-webkit-scrollbar-thumb {
  background: #ccc;
  border-radius: 3px;
}

.mobile-nav::-webkit-scrollbar-thumb:hover {
  background: #999;
}

/* ==================
   ANIMATIONS
   ================== */
@keyframes slideIn {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

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

/* Loading state */
.mobile-menu > li {
  animation: slideIn 0.3s ease forwards;
}

.mobile-menu > li:nth-child(1) { animation-delay: 0.05s; }
.mobile-menu > li:nth-child(2) { animation-delay: 0.1s; }
.mobile-menu > li:nth-child(3) { animation-delay: 0.15s; }
.mobile-menu > li:nth-child(4) { animation-delay: 0.2s; }
.mobile-menu > li:nth-child(5) { animation-delay: 0.25s; }