/* ===== CSS VARIABLES ===== */
:root {
  /* Primary Colors */
  --primary-blue: #2563eb;
  --primary-green: #16a34a;
  --primary-orange: #ea580c;
  --primary-purple: #7c3aed;
  
  /* Neutral Colors */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Semantic Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;
  
  /* Font Sizes */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */
  --text-5xl: 3rem;      /* 48px */
  
  /* Spacing */
  --space-1: 0.25rem;    /* 4px */
  --space-2: 0.5rem;     /* 8px */
  --space-3: 0.75rem;    /* 12px */
  --space-4: 1rem;       /* 16px */
  --space-6: 1.5rem;     /* 24px */
  --space-8: 2rem;       /* 32px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  
  /* Container Sizes */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  
  /* Animation */
  --transition-fast: 150ms ease-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 300ms ease-out;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
}

/* ===== DARK MODE VARIABLES ===== */
[data-theme="dark"] {
  --text-primary: var(--gray-100);
  --text-secondary: var(--gray-400);
  --bg-primary: var(--gray-900);
  --bg-secondary: var(--gray-800);
  --bg-tertiary: var(--gray-700);
  --border-color: var(--gray-600);
}

/* Light mode (default) */
[data-theme="light"], :root {
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-600);
  --bg-primary: white;
  --bg-secondary: var(--gray-50);
  --bg-tertiary: var(--gray-100);
  --border-color: var(--gray-300);
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ===== ACCESSIBILITY ===== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-blue);
  color: white;
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

/* Focus indicators */
:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

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

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

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

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

a:hover, a:focus {
  color: var(--primary-purple);
  text-decoration: underline;
}

/* ===== LAYOUT ===== */
.container {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-3);
  }
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 500;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
  gap: var(--space-2);
}

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

.btn-primary:hover, .btn-primary:focus {
  background-color: var(--primary-purple);
  color: white;
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover, .btn-secondary:focus {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  text-decoration: none;
  transform: translateY(-1px);
}

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

.btn-outline:hover, .btn-outline:focus {
  background-color: var(--primary-blue);
  color: white;
  text-decoration: none;
}

/* ===== HEADER ===== */
.header {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.logo a {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--primary-blue);
  text-decoration: none;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: var(--space-6);
}

.nav-menu a {
  color: var(--text-primary);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-menu a:hover, .nav-menu a:focus {
  background-color: var(--bg-secondary);
  text-decoration: none;
}

.nav-menu a[aria-current="page"] {
  color: var(--primary-blue);
  background-color: var(--bg-secondary);
}

/* Navigation Dropdown */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  list-style: none;
}

.nav-dropdown[aria-expanded="true"] .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

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

.nav-dropdown-menu a {
  display: block;
  padding: var(--space-2) var(--space-3);
  margin: 0;
  border-radius: var(--radius-md);
}

/* Theme Toggle & Language Select */
.nav-settings {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  background: none;
  border: none;
  font-size: var(--text-lg);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.theme-toggle:hover, .theme-toggle:focus {
  background-color: var(--bg-secondary);
}

.language-select {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
}

/* Mobile Navigation */
.nav-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.hamburger {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-fast);
  position: relative;
}

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

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  top: 8px;
}

/* ===== AD SPACES ===== */
.ad-space {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: var(--space-4) 0;
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
}

.ad-leaderboard {
  height: 90px;
  margin: 0;
}

.ad-rectangle {
  width: 300px;
  height: 250px;
  margin: 0;
}

.ad-native {
  height: 280px;
}

.ad-footer {
  height: 90px;
  margin-top: var(--space-8);
}

.ad-placeholder {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  text-align: center;
}

/* ===== HERO SECTION ===== */
.hero {
  padding: var(--space-16) 0;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-8);
  align-items: start;
}

.hero-title {
  font-size: var(--text-5xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.stats-widget {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.stats-widget h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
  text-align: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: var(--space-4);
}

.stat-number {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--primary-blue);
}

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

/* ===== TOOLS GRID ===== */
.tools-grid {
  padding: var(--space-16) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-12);
  font-size: var(--text-4xl);
}

.tools-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.tool-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  text-align: center;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.tool-card.featured {
  border-color: var(--primary-blue);
  background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(37, 99, 235, 0.05) 100%);
}

.tool-icon {
  font-size: var(--text-5xl);
  margin-bottom: var(--space-4);
}

.tool-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.tool-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.tool-features {
  list-style: none;
  margin-bottom: var(--space-6);
}

.tool-features li {
  padding: var(--space-1) 0;
  color: var(--text-secondary);
  position: relative;
}

.tool-features li::before {
  content: '✓';
  color: var(--success);
  font-weight: bold;
  margin-right: var(--space-2);
}

.tool-link {
  color: var(--primary-blue);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.tool-link:hover, .tool-link:focus {
  color: var(--primary-purple);
}

/* ===== GUIDE SECTION ===== */
.guide-section {
  padding: var(--space-16) 0;
  background-color: var(--bg-secondary);
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-12);
  list-style: none;
}

.guide-step {
  text-align: center;
}

.step-number {
  width: 60px;
  height: 60px;
  background-color: var(--primary-blue);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  font-weight: 700;
  margin: 0 auto var(--space-4);
}

.guide-step h3 {
  margin-bottom: var(--space-2);
}

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

/* ===== TESTIMONIALS ===== */
.testimonials {
  padding: var(--space-16) 0;
}

.testimonial-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.testimonial {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.testimonial p {
  font-size: var(--text-lg);
  font-style: italic;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

.testimonial cite {
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== FOOTER ===== */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-8) 0 var(--space-4);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

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

.footer-social {
  display: flex;
  gap: var(--space-3);
}

.footer-social a {
  font-size: var(--text-xl);
  text-decoration: none;
}

.footer-copyright {
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  border-top: 1px solid var(--border-color);
  padding-top: var(--space-4);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .hero-sidebar {
    order: -1;
    flex-direction: row;
    justify-content: center;
  }
  
  .ad-rectangle {
    width: 100%;
    max-width: 300px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--bg-primary);
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    padding: var(--space-16) var(--space-4);
    transition: left var(--transition-normal);
    z-index: 999;
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-toggle {
    display: flex;
    z-index: 1000;
  }
  
  .nav-dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    background: none;
    padding-left: var(--space-4);
  }
  
  .hero-title {
    font-size: var(--text-4xl);
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .tools-cards {
    grid-template-columns: 1fr;
  }
  
  .guide-steps {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
  
  .ad-leaderboard .ad-placeholder,
  .ad-footer .ad-placeholder {
    font-size: var(--text-xs);
  }
}

@media (max-width: 480px) {
  .hero {
    padding: var(--space-8) 0;
  }
  
  .hero-title {
    font-size: var(--text-3xl);
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn {
    width: 100%;
  }
  
  .tools-grid,
  .guide-section,
  .testimonials {
    padding: var(--space-8) 0;
  }
}

/* ===== ANIMATIONS ===== */
@media (prefers-reduced-motion: no-preference) {
  .tool-card,
  .testimonial {
    animation: fadeInUp 0.6s ease-out forwards;
  }
  
  .tool-card:nth-child(2) { animation-delay: 0.1s; }
  .tool-card:nth-child(3) { animation-delay: 0.2s; }
  .tool-card:nth-child(4) { animation-delay: 0.3s; }
  .tool-card:nth-child(5) { animation-delay: 0.4s; }
}

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

/* ===== PRINT STYLES ===== */
@media print {
  .ad-space,
  .nav-toggle,
  .theme-toggle,
  .footer-social {
    display: none !important;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
  }
  
  .hero,
  .tools-grid,
  .guide-section,
  .testimonials {
    padding: 1rem 0;
  }
}

/* ===== LOTTO SERVICE STYLES ===== */
.tool-card.lotto-service {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);
  border-color: #f59e0b;
  color: white;
  position: relative;
  overflow: hidden;
}

.tool-card.lotto-service::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 2px,
    rgba(255,255,255,0.1) 2px,
    rgba(255,255,255,0.1) 4px
  );
  animation: shimmer 3s linear infinite;
  pointer-events: none;
}

@keyframes shimmer {
  0% { transform: translateX(-100%) translateY(-100%); }
  100% { transform: translateX(100%) translateY(100%); }
}

.tool-card.lotto-service:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 20px 40px rgba(245, 158, 11, 0.3);
}

.tool-card.lotto-service .tool-title {
  color: white;
  font-weight: 700;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.tool-card.lotto-service .tool-description {
  color: rgba(255,255,255,0.9);
  font-weight: 500;
}

.tool-card.lotto-service .tool-features li {
  color: rgba(255,255,255,0.95);
  font-weight: 600;
}

.tool-card.lotto-service .tool-features li::before {
  content: '🎯';
  margin-right: 8px;
}

.service-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.stat-badge {
  background: rgba(255,255,255,0.2);
  color: white;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.3);
}

.external-link {
  background: rgba(255,255,255,0.2) !important;
  color: white !important;
  border: 2px solid rgba(255,255,255,0.4) !important;
  font-weight: 700 !important;
  backdrop-filter: blur(8px);
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
  position: relative;
  z-index: 1;
}

.external-link:hover {
  background: rgba(255,255,255,0.3) !important;
  border-color: rgba(255,255,255,0.6) !important;
  transform: scale(1.05);
}

/* GON.AI Logo Styles */
.logo a {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-main {
  font-size: var(--text-2xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.025em;
}

.logo-sub {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  font-weight: 500;
  margin-top: -2px;
  letter-spacing: 0.05em;
}

/* Navigation Lotto Link */
.nav-lotto {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: white !important;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-normal);
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.nav-lotto:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

/* Mobile Responsive for Lotto Card */
@media (max-width: 768px) {
  .tool-card.lotto-service {
    margin-top: var(--space-4);
    border: 2px solid #f59e0b;
  }
  
  .service-stats {
    justify-content: center;
  }
  
  .stat-badge {
    font-size: var(--text-xs);
    padding: 2px var(--space-2);
  }
  
  .logo-main {
    font-size: var(--text-xl);
  }
  
  .logo-sub {
    font-size: 10px;
  }
}