/* ============================================
   BETSTREAM.SHOP - CASINO MATHEMATICS ANALYSIS
   Responsive CSS Stylesheet
   ============================================ */

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: #0f3460;
  color: #e8e8e8;
  line-height: 1.6;
  letter-spacing: 0.3px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  color: #e8e8e8;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -1px;
}

h2 {
  font-size: 2rem;
  letter-spacing: -0.5px;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 16px;
  color: #e8e8e8;
  font-size: 1rem;
}

a {
  color: #00d4ff;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #00ffff;
  text-decoration: underline;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.header {
  background-color: #16213e;
  padding: 16px 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 2px solid #7c7c87;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-brand h1 {
  font-size: 1.5rem;
  margin: 0;
  color: #00d4ff;
}

.header-tagline {
  font-size: 0.75rem;
  color: #7c7c87;
  font-weight: 400;
  margin-top: 4px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.nav {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

.nav-link {
  color: #e8e8e8;
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.nav-link:hover {
  border-bottom-color: #00d4ff;
  color: #00d4ff;
  text-decoration: none;
}

.nav-link.active {
  color: #00d4ff;
  border-bottom-color: #00d4ff;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #00d4ff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  background: linear-gradient(135deg, #16213e 0%, #0f3460 50%, #1a4d6d 100%);
  padding: 80px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
  border-bottom: 3px solid #00d4ff;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.05) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(124, 124, 135, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-icon {
  width: 64px;
  height: 64px;
  display: inline-block;
  margin-bottom: 24px;
  color: #00d4ff;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #e8e8e8 0%, #00d4ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: #7c7c87;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: inline-flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-block;
  padding: 12px 28px;
  border: none;
  border-radius: 6px;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-primary {
  background-color: #00d4ff;
  color: #0f3460;
  box-shadow: 0 4px 12px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  background-color: #00ffff;
  box-shadow: 0 6px 20px rgba(0, 212, 255, 0.5);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: #00d4ff;
  border: 2px solid #00d4ff;
}

.btn-secondary:hover {
  background-color: #00d4ff;
  color: #0f3460;
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: #e8e8e8;
  border: 2px solid #7c7c87;
}

.btn-outline:hover {
  border-color: #00d4ff;
  color: #00d4ff;
}

/* ============================================
   MAIN CONTENT & SECTIONS
   ============================================ */

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 60px 0;
  position: relative;
}

.section:not(:first-of-type) {
  border-top: 1px solid #7c7c87;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.section-header h2 {
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: #00d4ff;
  border-radius: 2px;
}

.section-description {
  color: #7c7c87;
  font-size: 1.1rem;
  line-height: 1.8;
}

/* ============================================
   CARD LAYOUTS
   ============================================ */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
  margin-bottom: 40px;
}

.card {
  background-color: #16213e;
  border-radius: 8px;
  padding: 28px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  border-top: 4px solid #00d4ff;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.05) 0%, transparent 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 24px rgba(0, 212, 255, 0.2);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 48px;
  height: 48px;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
  color: #00d4ff;
  margin-bottom: 16px;
}

.card h3 {
  margin-bottom: 12px;
  font-size: 1.25rem;
}

.card p {
  color: #7c7c87;
  font-size: 0.95rem;
  line-height: 1.7;
}

.card-footer {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid #7c7c87;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-stat {
  display: flex;
  flex-direction: column;
}

.card-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: #00d4ff;
}

.card-stat-label {
  font-size: 0.85rem;
  color