/* ===================================
   HM88 Vietnam - Swiss Modern Style
   Professional Casino Design System
   =================================== */

/* Import Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Helvetica+Neue:wght@300;400;500;700&display=swap');

/* CSS Variables */
:root {
  /* Primary Colors - Swiss Modern */
  --color-white: #ffffff;
  --color-light-gray: #f8f9fa;
  --color-medium-gray: #e9ecef;
  --color-dark-gray: #6c757d;
  --color-charcoal: #343a40;
  --color-black: #212529;
  --color-primary: #2c5aa0;    /* Navy Blue */
  --color-accent: #28a745;     /* Success Green */
  --color-warning: #ffc107;    /* Warning Yellow */
  --color-danger: #dc3545;     /* Error Red */
  
  /* Neutral Scale */
  --gray-50: #f8f9fa;
  --gray-100: #e9ecef;
  --gray-200: #dee2e6;
  --gray-300: #ced4da;
  --gray-400: #adb5bd;
  --gray-500: #6c757d;
  --gray-600: #495057;
  --gray-700: #343a40;
  --gray-800: #212529;
  --gray-900: #0d1117;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-secondary: 'Helvetica Neue', Arial, sans-serif;
  
  /* Spacing System */
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */
  
  /* Grid & Layout */
  --container-max: 1200px;
  --container-padding: var(--space-6);
  --section-padding: var(--space-16);
  
  /* Borders & Shadows */
  --border-width: 1px;
  --border-color: var(--gray-200);
  --border-radius: 0;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-white);
  color: var(--color-black);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Main Container */
.main-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* Section Spacing */
.section {
  padding: var(--section-padding) 0;
}

.section-sm {
  padding: var(--space-12) 0;
}

.section-lg {
  padding: calc(var(--section-padding) * 1.5) 0;
}

.section-dark {
  background-color: var(--gray-900);
  color: var(--color-white);
}

.section-light {
  background-color: var(--gray-50);
}

.section-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: var(--color-white);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Header */
.header {
  background-color: var(--color-white);
  border-bottom: var(--border-width) solid var(--border-color);
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.logo {
  text-decoration: none;
  color: var(--color-black);
}

.header-logo {
  height: 50px;
  width: auto;
  display: block;
}

.logo-text {
  font-family: var(--font-primary);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* Navigation */
.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-3);
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: var(--color-black);
  font-weight: 500;
  font-size: 0.813rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  transition: var(--transition-fast);
  padding: var(--space-2) var(--space-2);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: var(--border-width) solid transparent;
  background: transparent;
  cursor: pointer;
  transition: var(--transition-normal);
  min-height: 44px;
}

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

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

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

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

.btn.glow {
  box-shadow: var(--shadow-md);
}

/* Header CTA */
.header-cta {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-black);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 80px;
  left: 0;
  width: 100%;
  background-color: var(--color-white);
  border-bottom: var(--border-width) solid var(--border-color);
  box-shadow: var(--shadow-lg);
  z-index: 999;
}

.mobile-nav {
  padding: var(--space-4) var(--container-padding);
}

.mobile-nav-link {
  display: block;
  padding: var(--space-4) 0;
  color: var(--color-black);
  text-decoration: none;
  font-weight: 500;
  border-bottom: var(--border-width) solid var(--border-color);
}

.mobile-nav-link:last-child {
  border-bottom: none;
}

.mobile-nav-link:hover {
  color: var(--color-primary);
}

.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 998;
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 80px;
  background-color: var(--gray-50);
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-background img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.1;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(44, 90, 160, 0.3) 0%, rgba(40, 167, 69, 0.4) 100%);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  max-width: 800px;
  padding: 0 var(--container-padding);
}

.hero-headline {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: var(--space-6);
  color: var(--color-black);
}

.hero-subheadline {
  font-size: 1.25rem;
  color: var(--gray-600);
  margin-bottom: var(--space-8);
  font-weight: 400;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  margin-bottom: var(--space-8);
}

/* Trust Badges */
.trust-badges {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.trust-badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--gray-600);
  font-size: 0.875rem;
  font-weight: 500;
}

/* Content Blocks */
.content-block {
  display: grid;
  gap: var(--space-12);
  align-items: center;
  margin-bottom: var(--space-16);
}

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

.content-block.vertical {
  grid-template-columns: 1fr;
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.content-image img {
  width: 100%;
  height: auto;
  display: block;
}

.content-headline {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: var(--space-6);
  color: inherit;
}

.content-paragraph {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: var(--space-8);
  color: inherit;
}

/* Grid System */
.content-grid {
  display: grid;
  gap: var(--space-8);
  margin-top: var(--space-12);
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-item {
  background-color: var(--color-white);
  border: var(--border-width) solid var(--border-color);
  overflow: hidden;
  transition: var(--transition-normal);
}

.section-dark .grid-item {
  background-color: var(--gray-800);
  border-color: var(--gray-700);
}

.section-gradient .grid-item {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.grid-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.grid-item-image {
  aspect-ratio: 16/9;
  overflow: hidden;
}

.grid-item-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

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

.grid-item-content {
  padding: var(--space-6);
}

.grid-item-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.grid-item-text {
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

/* Footer */
.footer {
  background-color: var(--gray-900);
  color: var(--color-white);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: auto;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-8);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  margin-bottom: var(--space-8);
}

.footer-column h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--color-white);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-links a {
  color: var(--gray-400);
  text-decoration: none;
  font-size: 0.875rem;
  transition: var(--transition-fast);
}

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

.payment-methods {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
}

.payment-icon {
  background-color: var(--gray-800);
  border: var(--border-width) solid var(--gray-700);
  padding: var(--space-2);
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-300);
}

.footer-bottom {
  border-top: var(--border-width) solid var(--gray-800);
  padding-top: var(--space-6);
  text-align: center;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-bottom: var(--space-2);
}

/* Responsive Design */
@media (max-width: 1200px) {
  .nav-menu {
    gap: var(--space-2);
  }
  .nav-link {
    font-size: 0.75rem;
    padding: var(--space-2) var(--space-1);
  }
}

@media (max-width: 1024px) {
  .nav-menu {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .content-block.horizontal {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: var(--space-4);
    --section-padding: var(--space-12);
  }
  
  /* Header adjustments for mobile */
  .header-content {
    padding: var(--space-2) var(--space-3);
  }
  
  .logo img {
    height: 35px !important;
    width: auto;
  }
  
  .header-cta {
    gap: var(--space-2);
  }
  
  .header-cta .btn {
    padding: var(--space-2) var(--space-3);
    font-size: 0.75rem;
    min-height: 36px;
  }
  
  .mobile-menu.show {
    display: block;
  }
  
  .mobile-menu-overlay.show {
    display: block;
  }
  
  .hero-headline {
    font-size: 2rem;
  }
  
  .hero-subheadline {
    font-size: 1rem;
  }
  
  .trust-badges {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .payment-methods {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .hero-cta .btn {
    width: auto;
    min-width: 200px;
  }
}

/* Author Bio Section */
.author-header {
  display: flex;
  align-items: center;
  margin-bottom: 25px;
  padding-bottom: 20px;
  border-bottom: 2px solid #e3f2fd;
}

.author-avatar {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  margin-right: 25px;
  box-shadow: 0 4px 15px rgba(44, 90, 160, 0.3);
}

.author-info h3 {
  color: var(--primary-color);
  font-size: 28px;
  margin: 0 0 8px 0;
  font-weight: 700;
}

.author-title {
  color: #666;
  font-size: 16px;
  margin: 0;
}

.author-details {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 12px;
  margin-top: 20px;
}

.author-details p {
  margin-bottom: 15px;
  line-height: 1.8;
  color: #333;
}

.author-details p:last-child {
  margin-bottom: 0;
}

.team-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.team-list li {
  padding: 15px 0;
  border-bottom: 1px solid #e0e0e0;
  line-height: 1.6;
}

.team-list li:last-child {
  border-bottom: none;
}

.commitment-text {
  font-style: italic;
  line-height: 1.8;
  color: #555;
  background: #f0f8ff;
  padding: 15px;
  border-radius: 8px;
  border-left: 3px solid var(--primary-color);
}

/* Utility Classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.no-scroll {
  overflow: hidden;
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .mobile-menu,
  .mobile-menu-overlay {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .main-wrapper {
    padding-top: 0;
  }
}