:root {
  --primary: #121212;
  --secondary: #0E7490;
  --accent: #1CBEA6;
  --highlight: #4CAF50;
  --warning: #FF9800;
  --text: #E0E0E0;
  --card-bg: #1C1C1C;
}

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

body {
  font-family: 'Roboto', sans-serif;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.header {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 20px;
  z-index: 1;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 50%, rgba(30, 144, 255, 0.1) 0%, transparent 50%);
  z-index: -1;
}

.header-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: 1.5rem;
  background: linear-gradient(90deg, var(--accent), var(--highlight));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 10px rgba(28, 190, 166, 0.3);
}

.header-subtitle {
  font-size: clamp(1rem, 2vw, 1.5rem);
  max-width: 800px;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.notice {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgba(0, 0, 0, 0.7);
  padding: 10px 20px;
  border-radius: 30px;
  font-size: 14px;
  backdrop-filter: blur(5px);
  z-index: 1000;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, var(--accent), var(--highlight));
  z-index: -1;
  border-radius: 14px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

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

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
}

.card:hover .card-img {
  transform: scale(1.03);
}

h1, h2, h3, h4 {
  margin-bottom: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
}

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

h2 {
  font-size: 2rem;
  color: var(--accent);
  position: relative;
  padding-bottom: 10px;
  margin-top: 3rem;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

h3 {
  font-size: 1.5rem;
  color: var(--highlight);
  margin-top: 2rem;
}

p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

pre {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  overflow-x: auto;
  border-left: 4px solid var(--accent);
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  line-height: 1.5;
}

code {
  font-family: 'Courier New', monospace;
  background: rgba(0, 0, 0, 0.2);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  background: var(--card-bg);
  border-radius: 8px;
  overflow: hidden;
}

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

th {
  background: rgba(0, 0, 0, 0.3);
  color: var(--accent);
}

tr:hover {
  background: rgba(0, 0, 0, 0.2);
}

.nav-tabs {
  display: flex;
  margin: 30px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-tab {
  padding: 10px 20px;
  cursor: pointer;
  position: relative;
  color: var(--text);
  opacity: 0.7;
  transition: all 0.3s ease;
}

.nav-tab:hover {
  opacity: 1;
}

.nav-tab.active {
  opacity: 1;
  color: var(--accent);
}

.nav-tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.5s ease;
}

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

.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0.5;
  animation: float linear infinite;
}

@keyframes float {
  0% { transform: translateY(0) translateX(0); opacity: 0; }
  50% { opacity: 0.8; }
  100% { transform: translateY(-100vh) translateX(20px); opacity: 0; }
}

@media (max-width: 768px) {
  .grid {
    grid-template-columns: 1fr;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.7rem;
  }
  
  h3 {
    font-size: 1.3rem;
  }
}

/* Additional decorative elements */
.decor-circle {
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(28, 190, 166, 0.1) 0%, transparent 70%);
  z-index: -1;
}

.decor-circle-1 {
  top: -150px;
  right: -150px;
}

.decor-circle-2 {
  bottom: -100px;
  left: -100px;
}

.highlight-box {
  background: linear-gradient(90deg, rgba(28, 190, 166, 0.1), transparent);
  border-left: 3px solid var(--accent);
  padding: 20px;
  margin: 30px 0;
  border-radius: 0 8px 8px 0;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  background: linear-gradient(90deg, var(--accent), var(--highlight));
  color: white;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(28, 190, 166, 0.3);
  border: none;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(28, 190, 166, 0.4);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
  box-shadow: none;
}

.btn-outline:hover {
  background: rgba(28, 190, 166, 0.1);
}