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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0f0f0f 100%);
  color: #e8e8e8;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Container for better layout */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 30px;
  position: relative;
}

/* Background decorative elements */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.05) 0%, transparent 50%),
              radial-gradient(circle at 40% 80%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
  z-index: -1;
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

h1 {
  font-size: 3.5em;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
  background: linear-gradient(135deg, #3b82f6 0%, #10b981 50%, #8b5cf6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
  animation: slideInDown 1.2s ease-out;
  position: relative;
}

h1::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 3px;
  background: linear-gradient(90deg, #3b82f6, #10b981, #8b5cf6);
  border-radius: 2px;
  animation: expand 1.5s ease-out 0.5s both;
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-100px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes expand {
  from {
    width: 0;
  }
  to {
    width: 100px;
  }
}

h2 {
  color: #3b82f6;
  font-size: 1.8em;
  font-weight: 600;
  margin: 40px 0 20px 0;
  padding: 15px 20px;
  background: rgba(59, 130, 246, 0.1);
  border-left: 4px solid #3b82f6;
  border-radius: 0 8px 8px 0;
  opacity: 0;
  transform: translateX(-50px);
  animation: slideInLeft 0.8s ease-out forwards;
  animation-delay: calc(var(--order, 0) * 0.2s);
  position: relative;
  overflow: hidden;
}

h2::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s ease;
}

h2:hover::before {
  left: 100%;
}

@keyframes slideInLeft {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

p {
  font-size: 1.15em;
  margin-bottom: 20px;
  line-height: 1.8;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease-out forwards;
  animation-delay: calc(var(--order, 0) * 0.1s + 0.3s);
  transition: all 0.3s ease;
  padding: 0 10px;
}

p:hover {
  color: #10b981;
  transform: translateX(10px);
}

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

strong {
  color: #10b981;
  font-weight: 700;
  text-shadow: 0 0 10px rgba(16, 185, 129, 0.3);
}

em {
  color: #8b5cf6;
  font-style: italic;
  font-weight: 500;
}

ul {
  margin: 25px 0;
  padding-left: 0;
  list-style: none;
}

li {
  margin-bottom: 15px;
  font-size: 1.1em;
  padding: 15px 20px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 10px;
  border: 1px solid rgba(59, 130, 246, 0.2);
  opacity: 0;
  transform: translateX(-30px);
  animation: slideInLeft 0.6s ease-out forwards;
  animation-delay: calc(var(--order, 0) * 0.1s + 0.5s);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

li::before {
  content: '▶';
  color: #3b82f6;
  font-weight: bold;
  margin-right: 10px;
  transition: transform 0.3s ease;
}

li:hover {
  background: rgba(59, 130, 246, 0.1);
  border-color: #3b82f6;
  transform: translateX(10px) scale(1.02);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.2);
}

li:hover::before {
  transform: translateX(5px);
  color: #10b981;
}

li strong {
  color: #3b82f6;
}

/* Links styling */
a {
  color: #8b5cf6;
  text-decoration: none;
  position: relative;
  transition: all 0.3s ease;
  padding: 2px 0;
}

a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #8b5cf6, #3b82f6);
  transition: width 0.3s ease;
}

a:hover {
  color: #10b981;
  text-shadow: 0 0 10px rgba(16, 185, 129, 0.5);
}

a:hover::after {
  width: 100%;
}

/* Responsive design */
@media (max-width: 768px) {
  .container {
    padding: 40px 20px;
  }
  
  h1 {
    font-size: 2.5em;
  }
  
  h2 {
    font-size: 1.5em;
    padding: 12px 15px;
  }
  
  p, li {
    font-size: 1em;
    padding: 12px 15px;
  }
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #1a1a1a;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, #10b981, #3b82f6);
}

/* Add stagger animation variables */
h2:nth-of-type(1) { --order: 1; }
h2:nth-of-type(2) { --order: 2; }
h2:nth-of-type(3) { --order: 3; }
h2:nth-of-type(4) { --order: 4; }
h2:nth-of-type(5) { --order: 5; }

p:nth-of-type(1) { --order: 1; }
p:nth-of-type(2) { --order: 2; }
p:nth-of-type(3) { --order: 3; }
p:nth-of-type(4) { --order: 4; }
p:nth-of-type(5) { --order: 5; }

li:nth-child(1) { --order: 1; }
li:nth-child(2) { --order: 2; }
li:nth-child(3) { --order: 3; }
li:nth-child(4) { --order: 4; }
li:nth-child(5) { --order: 5; }
li:nth-child(6) { --order: 6; }

/* Mobile-friendly dropdown functionality using checkbox hack */
.dropdown {
  position: relative;
  display: inline-block;
  width: 100%;
}

.dropdown-toggle {
  display: none;
}

.dropdown-content {
  position: relative;
  background: rgba(16, 185, 129, 0.05);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 8px;
  margin-top: 10px;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.dropdown-content p {
  font-size: 1em;
  margin: 8px 0;
  color: #c0c0c0;
  animation: none;
  opacity: 1;
  transform: none;
  padding: 0;
}

.dropdown-content strong {
  color: #10b981;
}

.dropdown-trigger {
  cursor: pointer;
  position: relative;
  display: block;
  width: 100%;
  user-select: none;
}

.dropdown-trigger::after {
  content: ' ▼';
  color: #8b5cf6;
  font-size: 0.8em;
  transition: transform 0.3s ease;
  display: inline-block;
}

/* Desktop hover behavior */
@media (hover: hover) {
  .dropdown:hover .dropdown-content {
    max-height: 300px;
    opacity: 1;
    transform: translateY(0);
    padding: 15px;
  }
  
  .dropdown:hover .dropdown-trigger::after {
    transform: rotate(180deg);
    color: #10b981;
  }
}

/* Mobile touch behavior */
@media (hover: none) {
  .dropdown-toggle:checked + .dropdown-trigger + .dropdown-content {
    max-height: 300px;
    opacity: 1;
    transform: translateY(0);
    padding: 15px;
  }
  
  .dropdown-toggle:checked + .dropdown-trigger::after {
    transform: rotate(180deg);
    color: #10b981;
  }
}

/* Related terms styling - make entire list item clickable */
.related-terms {
  list-style: none;
  margin: 25px 0;
  padding-left: 0;
}

.related-terms li {
  margin-bottom: 15px;
  font-size: 1.1em;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 10px;
  border: 1px solid rgba(59, 130, 246, 0.2);
  opacity: 0;
  transform: translateX(-30px);
  animation: slideInLeft 0.6s ease-out forwards;
  animation-delay: calc(var(--order, 0) * 0.1s + 0.5s);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.related-terms li a {
  display: block;
  padding: 15px 20px;
  width: 100%;
  height: 100%;
  text-decoration: none;
  color: inherit;
}

.related-terms li::before {
  content: '▶';
  color: #3b82f6;
  font-weight: bold;
  margin-right: 10px;
  transition: transform 0.3s ease;
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
}

.related-terms li a {
  padding-left: 50px;
  position: relative;
  z-index: 2;
}

.related-terms li:hover {
  background: rgba(59, 130, 246, 0.1);
  border-color: #3b82f6;
  transform: translateX(10px) scale(1.02);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.2);
}

.related-terms li:hover::before {
  transform: translateY(-50%) translateX(5px);
  color: #10b981;
}

.related-terms li strong {
  color: #3b82f6;
}

/* Enhanced section styling for dropdowns */
.info-section {
  background: rgba(255, 255, 255, 0.02);
  border-radius: 12px;
  padding: 20px;
  margin: 30px 0;
  border: 1px solid rgba(59, 130, 246, 0.15);
  transition: all 0.3s ease;
}

.info-section:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(59, 130, 246, 0.3);
  box-shadow: 0 8px 32px rgba(59, 130, 246, 0.1);
}

.expandable-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.expandable-list .dropdown {
  margin-bottom: 10px;
}