/* ================================
   3333WIN - LUXURY GOLD CASINO STYLE
   Style 1: Hào Nhoáng Vàng Kim
   ================================ */

/* ================================
   CSS VARIABLES - HỆ THỐNG THIẾT KẾ
   ================================ */
:root {
  /* === Hệ thống màu sắc === */
  /* Màu chủ đạo - Vàng sang trọng */
  --color-primary: #D4AF37;
  --color-primary-light: #FFD700;
  --color-primary-dark: #B8941F;
  --color-primary-rgb: 212, 175, 55;

  /* Màu phụ */
  --color-secondary: #0A0A0A;
  --color-accent: #FFD700;

  /* Hệ thống màu trung tính */
  --color-white: #FFFFFF;
  --color-gray-50: #FAFAFA;
  --color-gray-100: #F5F5F5;
  --color-gray-200: #E5E5E5;
  --color-gray-300: #D4D4D4;
  --color-gray-400: #A3A3A3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;
  --color-black: #000000;

  /* Màu nền và văn bản */
  --color-background: #0A0A0A;
  --color-background-alt: #111111;
  --color-background-card: #1A1A1A;
  --color-text: #FFFFFF;
  --color-text-secondary: #A3A3A3;
  --color-text-muted: #737373;

  /* Màu ngữ nghĩa */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;

  /* === Hệ thống khoảng cách (8px cơ sở) === */
  --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 */

  /* === Hệ thống đổ bóng === */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

  /* Hiệu ứng phát sáng vàng kim */
  --shadow-glow: 0 0 20px rgba(212, 175, 55, 0.5), 0 0 40px rgba(212, 175, 55, 0.3);
  --shadow-glow-sm: 0 0 10px rgba(212, 175, 55, 0.4);
  --shadow-glow-lg: 0 0 30px rgba(255, 215, 0, 0.6), 0 0 60px rgba(255, 215, 0, 0.3);

  /* === Hệ thống bo góc === */
  --radius-none: 0;
  --radius-sm: 0.25rem;    /* 4px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-3xl: 2rem;      /* 32px */
  --radius-full: 9999px;

  /* === Hệ thống phông chữ === */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-secondary: 'Playfair Display', Georgia, serif;

  /* Kích thước chữ */
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.875rem;    /* 30px */
  --font-size-4xl: 2.25rem;     /* 36px */
  --font-size-5xl: 3rem;        /* 48px */
  --font-size-6xl: 3.75rem;     /* 60px */

  /* Độ đậm chữ */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Độ cao dòng */
  --line-height-none: 1;
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* === Hiệu ứng chuyển tiếp === */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* === Chiều rộng container === */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;

  /* === Z-index === */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;

  /* === Gradient vàng === */
  --gradient-gold: linear-gradient(135deg, #D4AF37 0%, #FFD700 50%, #D4AF37 100%);
  --gradient-gold-dark: linear-gradient(135deg, #B8941F 0%, #D4AF37 50%, #B8941F 100%);
  --gradient-dark: linear-gradient(180deg, #1a1a1a 0%, #0a0a0a 100%);
}

/* ================================
   RESET & BASE STYLES
   ================================ */
*, *::before, *::after {
  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);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-background);
  line-height: var(--line-height-normal);
  min-height: 100vh;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ================================
   TYPOGRAPHY
   ================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-5);
  position: relative;
}

h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--gradient-gold);
  margin-top: var(--space-4);
  box-shadow: var(--shadow-glow-sm);
}

h2.text-center::after {
  margin-left: auto;
  margin-right: auto;
}

h3 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

h4 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

p {
  margin-bottom: var(--space-4);
  line-height: var(--line-height-relaxed);
  max-width: 75ch;
  color: var(--color-text-secondary);
}

.content-block p,
.block-text p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
}

ul, ol {
  margin-left: var(--space-6);
  margin-bottom: var(--space-4);
}

li {
  margin-bottom: var(--space-2);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

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

em {
  font-style: italic;
}

/* Text highlight vàng */
.text-gold {
  color: var(--color-primary);
}

.text-gradient {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ================================
   LAYOUT - CONTAINER
   ================================ */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.container-sm {
  max-width: var(--container-sm);
}

.container-lg {
  max-width: var(--container-2xl);
}

/* ================================
   HEADER
   ================================ */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
  transition: all var(--transition-base);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  gap: var(--space-8);
}

.logo {
  height: 48px;
  width: auto;
  transition: transform var(--transition-base);
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  display: inline-block;
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
}

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

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

.nav-cta-buttons {
  display: flex;
  gap: var(--space-3);
}

/* Mobile menu button */
.mobile-menu-button {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  color: var(--color-text);
}

.mobile-menu-button svg {
  width: 24px;
  height: 24px;
}

/* Mobile menu */
.mobile-menu {
  display: flex;
  position: static;
  background: transparent;
  padding: var(--space-4);
  flex-direction: column;
  margin: 0;
  list-style: none;
}

.mobile-menu.active {
  display: flex;
}

.mobile-menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-8);
}

.mobile-menu-close {
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: var(--space-2);
}

.mobile-menu-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-menu-nav .nav-link {
  font-size: var(--font-size-lg);
  padding: var(--space-4);
}

/* ================================
   HERO SECTION
   ================================ */
.hero-section {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  overflow: hidden;
  padding: var(--space-16) 0;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(0, 0, 0, 0.8) 0%,
    rgba(0, 0, 0, 0.5) 50%,
    rgba(0, 0, 0, 0.7) 100%
  );
  z-index: 1;
}

.hero-section .container {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: var(--container-md);
}

.hero-section h1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--space-6);
  line-height: var(--line-height-tight);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.hero-section h1 span {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-intro {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: var(--space-8);
  line-height: var(--line-height-relaxed);
  max-width: 100%;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.hero-buttons {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ================================
   BUTTONS
   ================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  line-height: 1.2;
}

.btn-primary {
  background: var(--gradient-gold);
  color: var(--color-black);
  box-shadow: var(--shadow-glow);
  border-color: var(--color-primary);
  text-shadow: none;
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow-lg);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-glow-sm);
}

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

.btn-secondary:hover {
  background: rgba(212, 175, 55, 0.1);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-sm);
}

.btn-lg {
  padding: var(--space-5) var(--space-10);
  font-size: var(--font-size-lg);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

/* ================================
   CONTENT BLOCK
   ================================ */
.content-block {
  padding: var(--space-16) 0;
}

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

.content-block .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.content-block.vertical .container {
  grid-template-columns: 1fr;
  max-width: var(--container-md);
  text-align: center;
}

.content-block.vertical h2::after {
  margin-left: auto;
  margin-right: auto;
}

.content-block.horizontal.reverse .container {
  direction: rtl;
}

.content-block.horizontal.reverse .block-text,
.content-block.horizontal.reverse .block-image {
  direction: ltr;
}

.block-text {
  padding: var(--space-6);
}

.block-text h2 {
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.block-text h3 {
  color: var(--color-primary);
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

.block-text ul,
.block-text ol {
  margin-left: var(--space-6);
  margin-bottom: var(--space-6);
}

.block-text li {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-3);
  position: relative;
  padding-left: var(--space-6);
}

.block-text ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--gradient-gold);
  border-radius: 50%;
}

.block-image {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(212, 175, 55, 0.2);
}

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

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

/* ================================
   CONTENT GRID
   ================================ */
.content-grid-section {
  padding: var(--space-16) 0;
}

.content-grid-section h2 {
  text-align: center;
  margin-bottom: var(--space-12);
}

.content-grid {
  display: grid;
  gap: var(--space-8);
}

.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-background-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid rgba(212, 175, 55, 0.15);
}

.grid-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-2xl), var(--shadow-glow-sm);
  border-color: rgba(212, 175, 55, 0.4);
}

.grid-item picture,
.grid-item .grid-item-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  flex-shrink: 0;
}

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

.grid-item:hover img {
  transform: scale(1.1);
}

.grid-item-content {
  padding: var(--space-6);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.grid-item h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.grid-item p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  flex-grow: 1;
}

.grid-item .btn {
  margin-top: var(--space-4);
}

/* ================================
   FEATURES / INFO BOXES
   ================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.feature-box {
  background: var(--color-background-card);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  text-align: center;
  border: 1px solid rgba(212, 175, 55, 0.15);
  transition: all var(--transition-base);
}

.feature-box:hover {
  border-color: rgba(212, 175, 55, 0.4);
  box-shadow: var(--shadow-glow-sm);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(212, 175, 55, 0.1);
  border-radius: var(--radius-xl);
  color: var(--color-primary);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
}

.feature-box h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-3);
}

.feature-box p {
  font-size: var(--font-size-sm);
  margin: 0 auto;
}

/* ================================
   TABLES
   ================================ */
.table-wrapper {
  overflow-x: auto;
  margin: var(--space-6) 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-background-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

th, td {
  padding: var(--space-4) var(--space-6);
  text-align: left;
  border-bottom: 1px solid rgba(212, 175, 55, 0.1);
}

th {
  background: rgba(212, 175, 55, 0.1);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

tr:hover td {
  background: rgba(212, 175, 55, 0.05);
}

/* ================================
   FAQ / ACCORDION
   ================================ */
.faq-section {
  padding: var(--space-16) 0;
}

.faq-item {
  background: var(--color-background-card);
  border: 1px solid rgba(212, 175, 55, 0.15);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: var(--space-5) var(--space-6);
  background: transparent;
  border: none;
  color: var(--color-text);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-base);
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-question svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 var(--space-6) var(--space-5);
  color: var(--color-text-secondary);
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ================================
   CONCLUSION / CTA SECTION
   ================================ */
.conclusion-section {
  padding: var(--space-16) 0;
  background: var(--gradient-dark);
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.conclusion-section .container {
  max-width: var(--container-md);
  text-align: center;
}

.conclusion-section h2 {
  margin-bottom: var(--space-6);
}

.conclusion-section h2::after {
  margin-left: auto;
  margin-right: auto;
}

.conclusion-section p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin: 0 auto var(--space-4);
}

.conclusion-section .hero-buttons {
  margin-top: var(--space-8);
}

/* ================================
   FOOTER
   ================================ */
.footer {
  background: var(--color-black);
  color: var(--color-gray-400);
  padding: var(--space-16) 0 var(--space-8);
  border-top: 1px solid rgba(212, 175, 55, 0.2);
}

.footer-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-section h3 {
  color: var(--color-white);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-4);
  font-family: var(--font-primary);
}

.footer-section p,
.footer-section a {
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.footer-section a:hover {
  color: var(--color-primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links li {
  margin: 0;
  padding: 0;
}

.footer-links a {
  display: inline-block;
  padding: var(--space-1) 0;
  transition: color var(--transition-base);
}

.payment-icons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.payment-icons img {
  height: 32px;
  width: auto;
  opacity: 0.7;
  transition: opacity var(--transition-base);
  filter: grayscale(100%);
}

.payment-icons img:hover {
  opacity: 1;
  filter: grayscale(0%);
}

.responsible-gaming {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.responsible-gaming img {
  height: 40px;
  width: auto;
}

.footer-bottom {
  border-top: 1px solid var(--color-gray-800);
  padding-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
  text-align: center;
}

.footer-bottom p {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
  margin: 0;
}

.affiliate-disclosure {
  background: rgba(212, 175, 55, 0.1);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid rgba(212, 175, 55, 0.2);
  font-size: var(--font-size-xs);
  color: var(--color-gray-400);
  max-width: 800px;
}

/* ================================
   BREADCRUMB
   ================================ */
.breadcrumb {
  padding: var(--space-4) 0;
  background: var(--color-background-alt);
  border-bottom: 1px solid rgba(212, 175, 55, 0.1);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
}

.breadcrumb-list li {
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.breadcrumb-list a {
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}

.breadcrumb-list a:hover {
  color: var(--color-primary);
}

.breadcrumb-list .separator {
  color: var(--color-gray-600);
}

.breadcrumb-list .current {
  color: var(--color-primary);
}

/* ================================
   ALERTS / NOTICES
   ================================ */
.alert {
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-lg);
  margin: var(--space-6) 0;
  border-left: 4px solid;
}

.alert-info {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--color-info);
  color: var(--color-info);
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border-color: var(--color-success);
  color: var(--color-success);
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.alert-danger {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--color-error);
  color: var(--color-error);
}

/* ================================
   RESPONSIVE DESIGN
   ================================ */

/* Tablet (1024px và nhỏ hơn) */
@media (max-width: 1024px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
  }

  .content-block .container {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .content-block.horizontal.reverse .container {
    direction: ltr;
  }

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

  .nav-menu {
    gap: var(--space-1);
  }

  .nav-link {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
  }
}

/* Mobile (768px và nhỏ hơn) */
@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
  }

  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .hero-section {
    min-height: 500px;
    padding: var(--space-12) 0;
  }

  .hero-section h1 {
    font-size: var(--font-size-3xl);
  }

  .hero-intro {
    font-size: var(--font-size-base);
  }

  .nav-menu {
    display: none;
  }

  .nav-cta-buttons {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .content-grid.cols-2,
  .content-grid.cols-3,
  .content-grid.cols-4 {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .btn {
    width: 100%;
    padding: var(--space-4) var(--space-6);
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn {
    width: 100%;
  }

  .footer-container {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
  }

  .content-block {
    padding: var(--space-12) 0;
  }

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

  h2::after {
    margin-left: auto;
    margin-right: auto;
  }

  .block-text {
    padding: var(--space-2);
  }

  table {
    font-size: var(--font-size-sm);
  }

  th, td {
    padding: var(--space-3) var(--space-4);
  }
}

/* ================================
   UTILITY CLASSES
   ================================ */
.text-center {
  text-align: center;
}

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

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

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

.hidden {
  display: none;
}

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

/* ================================
   ANIMATIONS
   ================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes glow {
  0%, 100% {
    box-shadow: var(--shadow-glow);
  }
  50% {
    box-shadow: var(--shadow-glow-lg);
  }
}

.animate-fade-in {
  animation: fadeIn 0.6s ease-out forwards;
}

.animate-glow {
  animation: glow 2s ease-in-out infinite;
}

/* ================================
   HEADER - ENHANCED STYLES
   ================================ */
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  gap: var(--space-6);
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-img {
  height: 45px;
  width: auto;
  transition: transform var(--transition-base);
}

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

/* Desktop Navigation */
.nav-desktop {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
}

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

.nav-item::before {
  display: none;
}

.dropdown-arrow {
  font-size: 10px;
  margin-left: 4px;
  transition: transform var(--transition-base);
}

/* Dropdown Menu */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  background: var(--color-background-card);
  border: 1px solid rgba(212, 175, 55, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--space-2) 0;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  margin: 0;
  z-index: var(--z-dropdown);
}

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

.dropdown-menu li {
  margin: 0;
  padding: 0;
}

.dropdown-menu li::before {
  display: none;
}

.dropdown-menu a {
  display: block;
  padding: var(--space-3) var(--space-5);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
}

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

/* Header CTA Buttons */
.header-cta {
  display: flex;
  gap: var(--space-3);
  flex-shrink: 0;
}

.header-cta .btn {
  padding: var(--space-2) var(--space-5);
  font-size: var(--font-size-sm);
}

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

.btn-outline:hover {
  background: rgba(212, 175, 55, 0.1);
  box-shadow: var(--shadow-glow-sm);
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
  position: relative;
  -webkit-tap-highlight-color: transparent;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 3px;
  background: var(--color-text);
  transition: all var(--transition-base);
  border-radius: 2px;
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation */
.nav-mobile {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: #0a0a0a;
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  box-shadow: 0 10px 40px rgba(0,0,0,0.5);
  max-height: calc(100vh - 70px);
  overflow-y: auto;
  z-index: 9999;
}

.nav-mobile.active {
  display: block !important;
}

.mobile-menu {
  margin: 0;
  padding: var(--space-4);
}

.mobile-nav-item {
  margin: 0;
  padding: 0;
}

.mobile-nav-item::before {
  display: none;
}

.mobile-nav-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4);
  color: var(--color-text);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  border-bottom: 1px solid rgba(212, 175, 55, 0.1);
  transition: all var(--transition-base);
}

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

.submenu-arrow {
  font-size: 12px;
  transition: transform var(--transition-base);
}

.mobile-nav-item.submenu-open .submenu-arrow {
  transform: rotate(180deg);
}

.submenu {
  display: none;
  margin: 0;
  padding: 0 0 0 var(--space-6);
  background: rgba(0, 0, 0, 0.2);
}

.mobile-nav-item.submenu-open .submenu {
  display: block;
}

.submenu li {
  margin: 0;
  padding: 0;
}

.submenu li::before {
  display: none;
}

.submenu a {
  display: block;
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  border-bottom: 1px solid rgba(212, 175, 55, 0.05);
  transition: color var(--transition-base);
}

.submenu a:hover {
  color: var(--color-primary);
}

.mobile-cta {
  padding: var(--space-3) var(--space-4);
}

.mobile-cta .btn {
  width: 100%;
}

.btn-block {
  width: 100%;
}

/* Header Scroll State */
.header.scrolled {
  background: rgba(10, 10, 10, 0.98);
  box-shadow: var(--shadow-lg);
}

/* Body state when menu is open */
body.menu-open {
  overflow: hidden;
}

/* ================================
   FOOTER - ENHANCED STYLES
   ================================ */
.footer-top {
  padding-bottom: var(--space-12);
  border-bottom: 1px solid rgba(212, 175, 55, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: var(--space-8);
}

.footer-brand {
  padding-right: var(--space-6);
}

.footer-logo {
  display: inline-block;
  margin-bottom: var(--space-4);
}

.footer-logo img {
  height: 45px;
  width: auto;
}

.footer-description {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
}

.footer-badges {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  flex-wrap: wrap;
}

.footer-badges img {
  height: 35px;
  width: auto;
  opacity: 0.8;
}

.footer-title {
  color: var(--color-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
  font-family: var(--font-primary);
}

.footer-menu {
  margin: 0;
}

.footer-menu li {
  margin: 0 0 var(--space-2) 0;
  padding: 0;
}

.footer-menu li::before {
  display: none;
}

.footer-menu a {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  transition: color var(--transition-base);
}

.footer-menu a:hover {
  color: var(--color-primary);
}

.footer-contact {
  text-align: left;
}

.footer-cta-text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-4);
}

.footer-cta-text strong {
  color: var(--color-primary);
  font-size: var(--font-size-xl);
}

.footer-support {
  margin-top: var(--space-6);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer-support strong {
  color: var(--color-text);
}

.footer-middle {
  padding: var(--space-8) 0;
  border-bottom: 1px solid rgba(212, 175, 55, 0.1);
}

.payment-section,
.provider-section {
  margin-bottom: var(--space-6);
}

.payment-section:last-child,
.provider-section:last-child {
  margin-bottom: 0;
}

.footer-middle .footer-title {
  margin-bottom: var(--space-4);
}

.payment-icons,
.provider-icons {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.payment-icons img,
.provider-icons img {
  height: 30px;
  width: auto;
  opacity: 0.6;
  filter: grayscale(100%);
  transition: all var(--transition-base);
}

.payment-icons img:hover,
.provider-icons img:hover {
  opacity: 1;
  filter: grayscale(0%);
}

.footer-bottom-inner {
  text-align: center;
  padding-top: var(--space-6);
}

.copyright {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-3);
}

.copyright a {
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}

.copyright a:hover {
  color: var(--color-primary);
}

.disclaimer {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  max-width: 600px;
  margin: 0 auto;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--gradient-gold);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: var(--z-fixed);
  box-shadow: var(--shadow-glow);
  color: var(--color-black);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow-lg);
}

/* ================================
   RESPONSIVE - HEADER & FOOTER
   ================================ */
@media (max-width: 1024px) {
  .header-inner {
    gap: var(--space-4);
  }

  .nav-desktop {
    display: none;
  }

  .header-cta {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }

  .footer-brand {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-brand {
    grid-column: span 1;
    padding-right: 0;
    text-align: center;
  }

  .footer-badges {
    justify-content: center;
  }

  .footer-links,
  .footer-contact {
    text-align: center;
  }

  .footer-menu {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-3);
  }

  .footer-menu li {
    margin: 0;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
  }
}

/* ================================
   TABLE OF CONTENTS
   ================================ */
.toc {
  background: var(--color-background-card);
  border: 1px solid rgba(212, 175, 55, 0.2);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin: var(--space-8) 0;
}

.toc-title {
  color: var(--color-primary);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.toc-list {
  margin: 0;
  counter-reset: toc-counter;
}

.toc-list li {
  margin: 0 0 var(--space-2) 0;
  padding: 0;
  counter-increment: toc-counter;
}

.toc-list li::before {
  display: none;
}

.toc-list a {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.toc-list a::before {
  content: counter(toc-counter) ".";
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  margin-right: var(--space-2);
  min-width: 24px;
}

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

/* ================================
   STEP BY STEP GUIDE
   ================================ */
.steps-section {
  padding: var(--space-12) 0;
}

.steps-list {
  counter-reset: step-counter;
  margin: 0;
}

.step-item {
  display: flex;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
  padding: var(--space-6);
  background: var(--color-background-card);
  border: 1px solid rgba(212, 175, 55, 0.15);
  border-radius: var(--radius-xl);
}

.step-item::before {
  display: none;
}

.step-number {
  counter-increment: step-counter;
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  background: var(--gradient-gold);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-black);
  box-shadow: var(--shadow-glow-sm);
}

.step-number::after {
  content: counter(step-counter);
}

.step-content {
  flex: 1;
}

.step-content h3 {
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.step-content p {
  margin: 0;
  color: var(--color-text-secondary);
}

/* ================================
   STATS / NUMBERS
   ================================ */
.stats-section {
  padding: var(--space-12) 0;
  background: var(--color-background-alt);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.stat-item {
  text-align: center;
  padding: var(--space-6);
}

.stat-number {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: var(--space-2);
}

.stat-label {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat-number {
    font-size: var(--font-size-4xl);
  }

  .step-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

/* ================================
   PRINT STYLES
   ================================ */
@media print {
  .header,
  .footer,
  .btn,
  .mobile-menu-btn,
  .back-to-top,
  .nav-mobile {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  a {
    text-decoration: underline;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }
}

/* MOBILE MENU FIX - FORCE OVERRIDE */
@media (max-width: 1024px) {
  #mobileNav {
    display: none !important;
    position: fixed !important;
    top: 70px !important;
    left: 0 !important;
    right: 0 !important;
    background: #0a0a0a !important;
    z-index: 99999 !important;
    padding: 0 !important;
    box-shadow: 0 10px 40px rgba(0,0,0,0.8) !important;
  }

  #mobileNav.active {
    display: block !important;
  }

  #mobileMenuBtn {
    display: flex !important;
    width: 44px !important;
    height: 44px !important;
    background: transparent !important;
    border: none !important;
    cursor: pointer !important;
    z-index: 100000 !important;
    position: relative !important;
  }
}