/* ============================================
   NH88 Vietnam - Master CSS
   Casino Style 1: Luxury Gold Casino
   ============================================ */

/* ============================================
   CSS Variables
   ============================================ */
:root {
  /* Colors - Style 1: Luxury Gold Casino */
  --color-primary: #D4AF37;        /* Gold */
  --color-secondary: #FFD700;      /* Bright Gold */
  --color-accent: #FF0000;         /* Red for CTA */
  --color-background: #0A0A0A;     /* Black */
  --color-surface: #1A1A1A;        /* Dark Gray */
  --color-text: #FFFFFF;           /* White */
  --color-text-secondary: #CCCCCC; /* Light Gray */
  --color-border: #D4AF37;         /* Gold Border */

  /* Fonts */
  --font-primary: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-decorative: 'Cinzel', Georgia, serif;

  /* Spacing */
  --spacing-xs: 0.5rem;    /* 8px */
  --spacing-sm: 1rem;      /* 16px */
  --spacing-md: 1.5rem;    /* 24px */
  --spacing-lg: 2rem;      /* 32px */
  --spacing-xl: 3rem;      /* 48px */
  --spacing-xxl: 4rem;     /* 64px */

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(212, 175, 55, 0.1);
  --shadow-md: 0 4px 8px rgba(212, 175, 55, 0.2);
  --shadow-lg: 0 8px 16px rgba(212, 175, 55, 0.3);
  --shadow-glow: 0 0 20px rgba(255, 215, 0, 0.5);
  --shadow-text: 0 2px 4px rgba(0, 0, 0, 0.8);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Container */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-md);
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background: var(--color-background);
  line-height: 1.6;
  overflow-x: hidden;
}

body.nav-open {
  overflow: hidden;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
  text-shadow: var(--shadow-text);
}

h1 {
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

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

a:hover {
  color: var(--color-secondary);
  text-shadow: var(--shadow-glow);
}

strong {
  color: var(--color-text);
  font-weight: 700;
}

/* ============================================
   Container & Layout
   ============================================ */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ============================================
   Header
   ============================================ */
.site-header {
  background: linear-gradient(180deg, #1A1A1A 0%, #0A0A0A 100%);
  border-bottom: 2px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--container-padding);
  flex-wrap: nowrap;
  gap: var(--spacing-md);
  position: relative;
}

.site-logo img {
  height: 60px;
  width: auto;
  filter: drop-shadow(var(--shadow-glow));
  transition: transform var(--transition-fast);
}

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

/* Prevent header items from shrinking to avoid CTA wrap */
.site-logo,
.mobile-menu-toggle {
  flex-shrink: 0;
}

.main-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
  overflow: visible;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-xs);
  align-items: center;
  flex-wrap: nowrap;
  white-space: nowrap;
}

.main-nav a {
  color: var(--color-text);
  font-weight: 500;
  padding: var(--spacing-xs) 10px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
  font-size: 0.9rem;
  white-space: nowrap;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: all var(--transition-fast);
  transform: translateX(-50%);
}

.main-nav a:hover::after {
  width: 80%;
}

.main-nav a:hover {
  color: var(--color-primary);
  background: rgba(212, 175, 55, 0.1);
}

/* Header CTA Buttons */
.header-cta {
  display: flex;
  gap: var(--spacing-sm);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Dropdown navigation */
.main-nav ul li { position: relative; }
.has-submenu > a::after {
  content: '▾';
  margin-left: 6px;
  font-size: 0.8em;
}
.submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
  min-width: 220px;
  padding: var(--spacing-xs) 0;
  z-index: 1001;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.submenu li {
  list-style: none;
}
.submenu li a {
  display: block;
  padding: var(--spacing-xs) var(--spacing-md);
  white-space: nowrap;
}
.has-submenu:hover > .submenu {
  display: block;
  pointer-events: auto;
  opacity: 1;
}


.mobile-menu-toggle {
  display: none;
  background: none;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  font-size: 1.5rem;
  padding: var(--spacing-xs);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background: var(--color-primary);
  color: var(--color-background);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 2px solid transparent;
  text-decoration: none;
  font-family: var(--font-primary);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent), #CC0000);
  color: var(--color-text);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  text-shadow: var(--shadow-text);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #FF3333, var(--color-accent));
  box-shadow: 0 0 30px rgba(255, 0, 0, 0.6);
  transform: translateY(-2px);
  color: var(--color-text);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-background);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  font-weight: 700;
}

.btn-secondary:hover {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  color: var(--color-background);
}

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

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

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(10, 10, 10, 0.8), rgba(26, 26, 26, 0.6));
  z-index: 1;
}

.hero-section .container {
  position: relative;
  z-index: 2;
  text-align: center;
}

.hero-section h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.8s ease;
}

.hero-intro {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 800px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.8;
  animation: fadeInUp 1s ease;
}

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

/* ============================================
   Content Blocks
   ============================================ */
.content-block {
  padding: var(--spacing-xxl) 0;
  background: var(--color-surface);
  border-top: 1px solid rgba(212, 175, 55, 0.2);
}

.content-block:nth-child(even) {
  background: var(--color-background);
}

.content-block .container {
  display: grid;
  gap: var(--spacing-xl);
  align-items: center;
}

.content-block.horizontal .container {
  grid-template-columns: 1fr 1fr;
}

.content-block.vertical .container {
  grid-template-columns: 1fr;
  text-align: center;
}

.block-text h2 {
  margin-bottom: var(--spacing-md);
}

.block-text h3 {
  color: var(--color-secondary);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.block-text p {
  margin-bottom: var(--spacing-sm);
}

.block-text ul, .block-text ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

.block-text li {
  margin-bottom: var(--spacing-xs);
}

.block-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--color-primary);
}

.block-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

.block-image:hover img {
  transform: scale(1.05);
}

/* ============================================
   Content Grids
   ============================================ */
.content-grid-section {
  padding: var(--spacing-xxl) 0;
  background: var(--color-background);
}

.content-grid-section h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.content-grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

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

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

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

.grid-item {
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.grid-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
  border-color: var(--color-secondary);
}

.grid-item img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.grid-item h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-secondary);
}

.grid-item p {
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ============================================
   Conclusion Section
   ============================================ */
.conclusion-section {
  padding: var(--spacing-xxl) 0;
  background: linear-gradient(135deg, #1A1A1A, #0A0A0A);
  border-top: 2px solid var(--color-primary);
  text-align: center;
}

.conclusion-section h2 {
  margin-bottom: var(--spacing-lg);
}

.conclusion-section p {
  max-width: 800px;
  margin: 0 auto var(--spacing-md);
  font-size: 1.1rem;
}

.conclusion-section .btn {
  margin-top: var(--spacing-lg);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: linear-gradient(180deg, #0A0A0A 0%, #000000 100%);
  border-top: 3px solid var(--color-primary);
  padding: var(--spacing-xxl) 0 var(--spacing-lg);
  color: var(--color-text-secondary);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-column h3 {
  color: var(--color-primary);
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
  font-family: var(--font-decorative);
}

.footer-column p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.footer-column ul {
  list-style: none;
}

.footer-column ul li {
  margin-bottom: var(--spacing-xs);
}

.footer-column a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--color-primary);
  text-shadow: none;
}

.payment-icons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.payment-icons img {
  height: 40px;
  width: auto;
  border-radius: var(--radius-sm);
  background: white;
  padding: 5px;
  transition: transform var(--transition-fast);
}

.payment-icons img:hover {
  transform: scale(1.1);
}

.footer-bottom {
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  padding-top: var(--spacing-lg);
  text-align: center;
}

.responsible-gaming {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.responsible-gaming img {
  height: 50px;
  width: auto;
}

.responsible-gaming p {
  font-size: 0.9rem;
  max-width: 600px;
}

.affiliate-disclaimer {
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.copyright {
  font-size: 0.85rem;
  color: #888;
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet (1024px and below) */
@media (max-width: 1024px) {
  :root {
    --container-padding: var(--spacing-sm);
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .hero-section h1 {
    font-size: 2.5rem;
  }

  .header-container {
    gap: var(--spacing-sm);
  }

  .site-logo img {
    height: 48px;
  }

  .header-cta {
    gap: var(--spacing-xs);
    order: 3;
  }

  .header-cta .btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
  }

  .mobile-menu-toggle {
    display: block;
    font-size: 1.4rem;
    padding: 0.35rem 0.6rem;
    order: 4;
    margin-left: auto;
  }

  .main-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(12, 12, 12, 0.96);
    backdrop-filter: blur(6px);
    border-top: 2px solid var(--color-primary);
    box-shadow: var(--shadow-lg);
    padding: calc(var(--mobile-header-offset, 72px) + var(--spacing-sm)) var(--container-padding) var(--spacing-lg);
    z-index: 1200;
    overflow-y: auto;
    transform: translateY(-110%);
    transition: transform var(--transition-normal) ease;
  }

  .main-nav.active {
    display: block;
    transform: translateY(0);
  }

  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
    margin: 0;
    padding: 0;
  }

  .main-nav li {
    width: 100%;
  }

  .main-nav a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.04);
    text-align: left;
    font-size: 1rem;
  }

  .main-nav li.open > a {
    background: rgba(212, 175, 55, 0.12);
    color: var(--color-primary);
  }

  .main-nav a::after {
    content: '';
    position: static;
    width: auto;
    height: auto;
    background: none;
    transform: none;
    margin-left: auto;
  }

  .main-nav .has-submenu > a::after {
    content: '▸';
    font-size: 0.85em;
    transition: transform var(--transition-fast);
  }

  .main-nav li.open > a::after {
    transform: rotate(90deg);
  }

  .main-nav.active .submenu {
    display: none;
    position: static;
    border: 0;
    box-shadow: none;
    background: transparent;
    padding: 0;
    margin-top: var(--spacing-xs);
    pointer-events: auto;
  }

  .main-nav li.open > .submenu {
    display: block;
    pointer-events: auto;
  }

  .main-nav.active .submenu li a {
    padding: var(--spacing-xs) var(--spacing-md) var(--spacing-xs) calc(var(--spacing-lg) * 1.4);
    font-size: 0.9rem;
    background: transparent;
    justify-content: flex-start;
  }

  .main-nav.active .submenu li a:hover {
    color: var(--color-primary);
    background: rgba(255, 255, 255, 0.05);
  }

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

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

/* Mobile (768px and below) */
@media (max-width: 768px) {
  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .hero-section {
    min-height: 400px;
  }

  .hero-section h1 {
    font-size: 2rem;
  }

  .hero-intro {
    font-size: 1rem;
  }

  .site-logo img {
    height: 42px;
  }

  .header-cta {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .header-cta .btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
  }

  .content-block.horizontal .container {
    grid-template-columns: 1fr;
  }

  .content-grid.cols-2,
  .content-grid.cols-3,
  .content-grid.cols-4 {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
  text-align: center;
}

.text-primary {
  color: var(--color-primary);
}

.text-secondary {
  color: var(--color-secondary);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

/* ============================================
   Loading States
   ============================================ */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.3s;
}

img[loading="lazy"].loaded {
  opacity: 1;
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  .site-header,
  .site-footer,
  .btn,
  .hero-section {
    display: none;
  }

  body {
    background: white;
    color: black;
  }
}