/* IMPORT VARIABLES & GLOBAL TOKENS */
@import url('variables.css');

/* CSS RESET & GENERAL STYLES */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  color: var(--color-text-main);
  background-color: var(--color-light-bg);
  line-height: 1.6;
  font-weight: 400;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* TYPOGRAPHY */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-secondary);
}

h1 { font-size: 2.5rem; } /* 40px */
h2 { font-size: 2rem; }   /* 32px */
h3 { font-size: 1.5rem; } /* 24px */
h4 { font-size: 1.25rem; }/* 20px */

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover, a:focus {
  color: var(--color-primary-dark);
}

ul, ol {
  list-style: none;
}

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

/* ACCESSIBILITY & A11Y STYLES */
/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 8px 16px;
  z-index: 10000;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* Custom Focus Ring for keyboard users */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px dashed var(--color-primary);
  outline-offset: 4px;
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* prefers-reduced-motion reset */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .parallax {
    background-attachment: scroll !important;
  }
}

/* LAYOUT CONTAINER & UTILITY CLASSES */
.container {
  width: 100%;
  padding-right: 15px;
  padding-left: 15px;
  margin-right: auto;
  margin-left: auto;
  max-width: var(--container-max-width);
}

.section {
  padding: var(--section-padding-desktop);
}

@media (max-width: 768px) {
  .section {
    padding: var(--section-padding-mobile);
  }
}

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

.text-center { text-align: center; }
.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }

/* Grid Systems */
.grid {
  display: grid;
  gap: var(--grid-gap-desktop);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 992px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
    gap: var(--grid-gap-mobile);
  }
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9375rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: var(--border-radius-btn);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-normal);
  text-align: center;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover, .btn-primary:focus {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  box-shadow: var(--shadow-hover);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.btn-secondary:hover, .btn-secondary:focus {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn-outline-white {
  background-color: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

.btn-outline-white:hover, .btn-outline-white:focus {
  background-color: var(--color-white);
  color: var(--color-secondary);
}

/* GLOBAL HEADER & TOPBAR */
.topbar {
  background-color: #0c0d14 !important;
  color: var(--color-white);
  padding: 8px 0;
  font-size: 0.8125rem;
  font-weight: 500;
}

.topbar-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topbar-left span,
.topbar-right span {
  margin-right: 20px;
}

.topbar-left span:last-child,
.topbar-right span:last-child {
  margin-right: 0;
}

@media (max-width: 768px) {
  .topbar {
    display: none; /* Ẩn topbar trên mobile để tối ưu diện tích */
  }
}

/* Sticky Header */
.main-header {
  background-color: var(--color-white);
  border-bottom: 1px solid #EAEAEA;
  position: relative;
  z-index: 1000;
  transition: var(--transition-normal);
}

.main-header.is-sticky {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  box-shadow: var(--shadow-default);
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from { transform: translateY(-100%); }
  to { transform: translateY(0); }
}

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

.logo img {
  height: 40px;
}

/* Desktop Navigation & Mega Menu */
.nav-menu {
  display: flex;
  align-items: center;
}

.nav-menu > ul {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
  margin: 0 12px;
}

.nav-link {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-secondary);
  padding: 28px 0;
  display: block;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 20px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width 0.3s ease;
}

.nav-link:hover::after, 
.nav-item:hover > .nav-link::after,
.nav-menu .nav-link[aria-current="page"]::after {
  width: 100%;
}

.nav-menu .nav-link[aria-current="page"] {
  color: var(--color-primary) !important;
}

.nav-link:hover, .nav-item:hover > .nav-link {
  color: var(--color-primary);
}

/* Mega Menu */
.mega-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  width: 680px;
  background-color: var(--color-white);
  box-shadow: var(--shadow-hover);
  border-radius: 8px;
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1001;
}

.nav-item:hover .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.mega-col-title {
  font-size: 0.875rem;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
  border-bottom: 1px solid #F0F0F0;
  padding-bottom: 6px;
}

.mega-list li a {
  display: flex;
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-text-main);
  padding: 6px 0;
}

.mega-list li a img {
  width: 32px;
  margin-right: 8px;
}

.mega-list li a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

/* Standard Dropdown */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--color-white);
  box-shadow: var(--shadow-hover);
  border-radius: 6px;
  padding: 12px 0;
  width: 220px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(15px);
  transition: all 0.3s ease;
  z-index: 1001;
}

.nav-item:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li a {
  display: block;
  padding: 8px 20px;
  font-size: 0.875rem;
  color: var(--color-text-main);
}

.dropdown-menu li a:hover {
  background-color: var(--color-accent-bg);
  color: var(--color-primary);
}

/* Hamburger & Mobile Menu Styles */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.hamburger span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--color-secondary);
  margin: 5px 0;
  transition: var(--transition-fast);
}

@media (max-width: 992px) {
  .nav-menu, .header-cta {
    display: none;
  }
  .hamburger {
    display: block;
  }
}

/* STICKY MOBILE ACTION BAR (Fixed Bottom) */
.mobile-action-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 60px;
  background-color: var(--color-white);
  box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
  z-index: 999;
}

.mobile-action-wrapper {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  height: 100%;
}

.mobile-action-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  border-right: 1px solid #ECECEC;
  padding: 4px;
}

.mobile-action-item:last-child {
  border-right: none;
  background-color: var(--color-primary);
  color: var(--color-white);
}

.mobile-action-item i {
  font-size: 1.25rem;
  margin-bottom: 2px;
}

@media (max-width: 768px) {
  .mobile-action-bar {
    display: block;
  }
  body {
    padding-bottom: 60px; /* Thêm padding dưới cùng để tránh bị che mất nội dung footer */
  }
}

/* GLOBAL FOOTER */
.main-footer {
  background-color: #0A0A0A;
  color: var(--color-text-light);
  padding: 60px 0 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--grid-gap-desktop);
  margin-bottom: 40px;
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.footer-widget-title {
  color: var(--color-white);
  font-size: 1.125rem;
  text-transform: uppercase;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 8px;
}

.footer-widget-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: var(--color-primary);
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links li a {
  color: #B0B0C0;
}

.footer-links li a:hover {
  color: var(--color-white);
  padding-left: 6px;
}

.footer-contact li {
  display: flex;
  margin-bottom: 12px;
  color: #B0B0C0;
}

.footer-contact li i {
  color: var(--color-primary);
  margin-right: 12px;
  font-size: 1.1rem;
  margin-top: 4px;
}

.footer-copyright {
  border-top: 1px solid #2D2D44;
  padding-top: 20px;
  text-align: center;
  font-size: 0.875rem;
  color: #8D8D9F;
}

/* GLOBAL MODAL / POPUP */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 10000;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

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

.modal-content {
  background-color: var(--color-white);
  border-radius: var(--border-radius-card);
  padding: 32px;
  width: 100%;
  max-width: 500px;
  position: relative;
  transform: translateY(-30px);
  transition: var(--transition-normal);
}

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

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-muted);
}

.modal-close:hover {
  color: var(--color-primary);
}

/* FORM ELEMENTS */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 6px;
  color: var(--color-secondary);
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid #D0D0D0;
  border-radius: var(--border-radius-input);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text-main);
  transition: var(--transition-fast);
}

.form-input::placeholder {
  color: var(--color-placeholder);
}

.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(187, 22, 43, 0.15);
  outline: none;
}

.just-validate-error-label {
  font-size: 0.8125rem;
  color: var(--color-primary) !important;
  margin-top: 4px;
  font-weight: 500;
}

/* Footer Social Links Styling */
.footer-social-links {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  justify-content: flex-start; /* Canh trái các icon xã hội ở cột 4 */
}

.footer-social-links a {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #B0B0C0;
  font-size: 1.15rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.footer-social-links a:hover {
  background-color: var(--color-primary) !important; /* Đỏ KIA Live Red khi hover */
  border-color: var(--color-primary) !important;
  color: #FFFFFF !important;
  transform: translateY(-3px);
  box-shadow: 0 4px 15px rgba(187, 22, 43, 0.4);
}