:root {
  --primary-color: #1A237E;
  --accent-orange: #FF9800;
  --accent-green: #4CAF50;
  --background-gradient: linear-gradient(135deg, #121212, #212121);
  --card-bg: rgba(255, 255, 255, 0.1);
  --text-light: rgba(255, 255, 255, 0.9);
  --text-muted: rgba(255, 255, 255, 0.6);
}

@font-face {
  font-family: 'Roboto';
  src: url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');
}

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

body {
  background: var(--background-gradient);
  font-family: 'Roboto', sans-serif;
  color: var(--text-light);
  line-height: 1.6;
  padding-top: 80px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.header {
  text-align: center;
  margin-bottom: 40px;
  position: relative;
}

.header::after {
  content: '';
  display: block;
  width: 100px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-orange), var(--accent-green));
  margin: 20px auto;
  border-radius: 2px;
}

h1, h2, h3, h4 {
  font-weight: 500;
  margin-bottom: 20px;
  color: white;
}

h1 {
  font-size: 2.5rem;
  background: linear-gradient(90deg, #fff, var(--accent-orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: 1.8rem;
  position: relative;
  padding-bottom: 10px;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--accent-green);
}

h3 {
  font-size: 1.5rem;
  color: var(--accent-orange);
}

p {
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 30px;
  margin-bottom: 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.05), transparent);
  z-index: -1;
}

.code-block {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  border-left: 4px solid var(--accent-orange);
  overflow-x: auto;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.gallery img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s, box-shadow 0.3s;
}

.gallery img:hover {
  transform: scale(1.03);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.note {
  background: rgba(255, 152, 0, 0.1);
  border-left: 4px solid var(--accent-orange);
  padding: 15px;
  margin: 20px 0;
  border-radius: 0 4px 4px 0;
}

.footer-note {
  text-align: center;
  margin-top: 60px;
  padding: 20px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Animations */
@keyframes float {
  0% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
  100% { transform: translateY(0); }
}

@keyframes pulse {
  0% { opacity: 0.6; }
  50% { opacity: 1; }
  100% { opacity: 0.6; }
}

.floating {
  animation: float 4s ease-in-out infinite;
}

.pulsing {
  animation: pulse 2s ease-in-out infinite;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .card {
    padding: 20px;
  }
  
  .gallery {
    grid-template-columns: 1fr;
  }
}

/* Navigation */
.nav-tabs {
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-tab {
  padding: 10px 20px;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.3s;
}

.nav-tab.active {
  color: var(--accent-orange);
  border-bottom-color: var(--accent-orange);
}

.nav-tab:hover:not(.active) {
  color: var(--text-light);
  border-bottom-color: rgba(255, 255, 255, 0.3);
}

/* Table styles */
.table-container {
  overflow-x: auto;
  margin: 30px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

th, td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

th {
  background: rgba(26, 35, 126, 0.5);
  font-weight: 500;
}

tr:hover {
  background: rgba(255, 255, 255, 0.05);
}

.positive {
  color: var(--accent-green);
}

.negative {
  color: #f44336;
}