/* Global Styles */
:root {
  --primary-color: #ffd700; /* Yellow */
  --primary-text: #1a1a1a;  /* Almost Black */
  --secondary-text: #555555; /* Grey */
  --bg-color: #f9f9f9;      /* Off-white */
  --card-bg: #ffffff;       /* Pure White */
  --header-bg: #000000;     /* Black */
  --header-text: #ffffff;   /* White */
  --accent-grey: #e0e0e0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-color);
  color: var(--primary-text);
  line-height: 1.6;
}

/* Header */
header {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: 1.5rem 0;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-content h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.header-content p {
  color: var(--primary-color);
  font-weight: 500;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Main Layout */
.container {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

/* Tabs Navigation */
.tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
  background: var(--card-bg);
  padding: 0.5rem;
  border-radius: 50px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  position: sticky;
  top: 1rem;
  z-index: 100;
}

.tab-btn {
  flex: 1;
  padding: 0.8rem 1.5rem;
  border: none;
  background: transparent;
  color: var(--secondary-text);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 40px;
  transition: all 0.3s ease;
}

.tab-btn:hover {
  color: var(--primary-text);
  background-color: var(--bg-color);
}

.tab-btn.active {
  background-color: var(--primary-color);
  color: var(--primary-text);
  box-shadow: 0 2px 8px rgba(255, 215, 0, 0.4);
}

/* Content Sections */
.content-section {
  display: none;
  background: var(--card-bg);
  padding: 3rem;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
  animation: fadeIn 0.4s ease-out;
}

.content-section.active {
  display: block;
}

/* Typography in Content */
h2 {
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-color);
  display: inline-block;
}

h3 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--primary-text);
}

p {
  margin-bottom: 1rem;
  color: var(--secondary-text);
}

ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
  color: var(--secondary-text);
}

li {
  margin-bottom: 0.5rem;
}

/* Footer */
footer {
  text-align: center;
  padding: 3rem 0;
  margin-top: 3rem;
  color: var(--secondary-text);
  font-size: 0.9rem;
  border-top: 1px solid var(--accent-grey);
}

.contact-info {
  margin-top: 1rem;
}

.contact-info a {
  color: var(--primary-text);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 2px solid var(--primary-color);
}

/* Responsive */
@media (max-width: 600px) {
  .content-section {
    padding: 1.5rem;
  }
  
  .tabs {
    border-radius: 12px;
  }
  
  .tab-btn {
    border-radius: 8px;
    font-size: 0.9rem;
  }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}