/* 
  yuenancasinoseo.com - Main Stylesheet
  A modern, responsive design for Vietnam casino SEO services targeting Chinese market
*/

/* ====== Base Styles ====== */
:root {
  /* Color Palette - Different from previous sites */
  --primary: #e74c3c;
  --primary-dark: #c0392b;
  --secondary: #34495e;
  --accent: #f39c12;
  --light: #f9f9f9;
  --dark: #2c3e50;
  --gray: #7f8c8d;
  --gray-light: #f1f1f1;
  
  /* Typography */
  --font-main: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-heading: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3.5rem;
  
  /* Border Radius */
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 12px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-main);
  color: var(--dark);
  line-height: 1.6;
  background-color: #fff;
  overflow-x: hidden;
}

img, svg {
  max-width: 100%;
  display: block;
}

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

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

ul {
  list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.01em;
}

h1 {
  font-size: 2.5rem;
  color: var(--primary);
}

h2 {
  font-size: 2rem;
  position: relative;
  padding-bottom: var(--spacing-sm);
}

h2:after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--primary);
}

h3 {
  font-size: 1.4rem;
}

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

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
}

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

.section-header p {
  font-size: 1.1rem;
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 4px 6px rgba(231, 76, 60, 0.15);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(231, 76, 60, 0.25);
}

.btn-secondary {
  background-color: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-secondary:hover {
  background-color: rgba(231, 76, 60, 0.1);
  color: var(--primary-dark);
  transform: translateY(-2px);
}

/* Header & Navigation - Different layout */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  background-color: white;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  z-index: 100;
  padding: 0.75rem 0;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
}

.logo a {
  display: flex;
  align-items: center;
  color: var(--primary);
}

.logo-icon {
  margin-right: var(--spacing-sm);
}

.main-nav .nav-list {
  display: flex;
  gap: var(--spacing-lg);
}

.main-nav a {
  color: var(--secondary);
  font-weight: 600;
  padding: 0.5rem 0;
  position: relative;
}

.main-nav a::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: var(--primary);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform var(--transition-normal);
}

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

.main-nav a:hover::before {
  transform: scaleX(1);
  transform-origin: left center;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

.menu-icon {
  display: block;
  position: relative;
  width: 24px;
  height: 2px;
  background-color: var(--primary);
}

.menu-icon::before,
.menu-icon::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--primary);
  transition: all var(--transition-normal);
}

.menu-icon::before {
  top: -8px;
}

.menu-icon::after {
  bottom: -8px;
}

/* Hero Section - Different style */
.hero {
  padding: var(--spacing-xl) 0;
  background: linear-gradient(135deg, rgba(231, 76, 60, 0.05) 0%, rgba(192, 57, 43, 0.1) 100%);
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: rgba(231, 76, 60, 0.03);
  clip-path: polygon(20% 0, 100% 0, 100% 100%, 0% 100%);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-content {
  max-width: 600px;
}

.hero h1 {
  font-size: 2.75rem;
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  color: var(--secondary);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
}

.hero-visual {
  display: flex;
  justify-content: flex-end;
}

/* About Section - Different layout */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.about-text {
  font-size: 1.05rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  text-align: center;
}

.stat-item {
  background: linear-gradient(145deg, #ffffff, #f9f9f9);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  box-shadow: 5px 5px 15px rgba(0, 0, 0, 0.05), -5px -5px 15px rgba(255, 255, 255, 0.6);
  transition: transform var(--transition-normal);
  border-top: 3px solid var(--primary);
}

.stat-item:hover {
  transform: translateY(-5px);
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: 1rem;
  color: var(--secondary);
  font-weight: 600;
}

/* Services Section - Different card style */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.service-card {
  background-color: white;
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  border-bottom: 3px solid transparent;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.service-card:hover {
  transform: translateY(-5px);
  border-bottom: 3px solid var(--primary);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.service-icon {
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

.service-card h3 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-sm);
  color: var(--secondary);
}

/* Advantage Section */
.advantage-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.advantage-feature {
  position: relative;
  padding: var(--spacing-lg);
  background-color: white;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  transition: all var(--transition-normal);
}

.advantage-feature:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.feature-number {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.1;
  line-height: 1;
}

.advantage-feature h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--primary);
}

/* CTA Section */
.cta {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: "";
  position: absolute;
  width: 300px;
  height: 300px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  top: -150px;
  right: -150px;
}

.cta::after {
  content: "";
  position: absolute;
  width: 200px;
  height: 200px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  bottom: -100px;
  left: -100px;
}

.cta .container {
  position: relative;
  z-index: 2;
}

.cta h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.cta h2:after {
  background-color: white;
}

.cta p {
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
}

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

.cta .btn-primary:hover {
  background-color: var(--light);
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.3);
}

/* Contact Section - Different layout */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-xl);
  background-color: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.08);
}

.contact-info {
  background-color: var(--gray-light);
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.contact-icon {
  color: var(--primary);
  flex-shrink: 0;
}

.contact-form {
  padding: var(--spacing-xl);
}

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  color: var(--secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--gray-light);
  border-radius: var(--radius-md);
  font-family: var(--font-main);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

/* Footer - Different style */
.site-footer {
  background-color: var(--secondary);
  color: white;
  padding: var(--spacing-xl) 0 var(--spacing-md);
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand p {
  margin-bottom: var(--spacing-sm);
  opacity: 0.8;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.footer-column h3 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-md);
  color: white;
  position: relative;
  padding-bottom: var(--spacing-xs);
}

.footer-column h3:after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: var(--primary);
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-column a {
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--transition-fast);
}

.footer-column a:hover {
  color: white;
  transform: translateX(3px);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.5);
}

/* Responsive Styles */
@media (max-width: 992px) {
  h1 {
    font-size: 2.2rem;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  .hero .container,
  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
  }
  
  .hero-visual {
    order: -1;
    justify-content: center;
    margin-bottom: var(--spacing-md);
  }
  
  .about-stats {
    margin-top: var(--spacing-lg);
  }
  
  .contact-info {
    padding: var(--spacing-lg);
  }
  
  .contact-form {
    padding: var(--spacing-lg);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .main-nav .nav-list {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    flex-direction: column;
    gap: 0;
    background-color: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
    z-index: 100;
  }
  
  .main-nav.active .nav-list {
    max-height: 300px;
  }
  
  .main-nav .nav-list li {
    width: 100%;
  }
  
  .main-nav .nav-list a {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--gray-light);
  }
  
  .main-nav a::before {
    display: none;
  }
  
  .about-stats {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .advantage-features {
    gap: var(--spacing-md);
  }
}

@media (max-width: 576px) {
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .service-card {
    text-align: center;
  }
  
  .advantage-feature {
    text-align: center;
  }
  
  .feature-number {
    position: static;
    margin-bottom: var(--spacing-sm);
  }
  
  .contact-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}