:root {
  --primary: #1e3c72;
  --secondary: #2a5298;
  --accent: #ff8c00;
  --light: #f8f9fa;
  --dark: #212529;
  --success: #28a745;
  --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
}

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

body {
  font-family: 'Segoe UI', Roboto, 'Open Sans', sans-serif;
  line-height: 1.6;
  color: var(--dark);
  background: var(--light);
  overflow-x: hidden;
}

.header {
  position: relative;
  height: 80vh;
  min-height: 500px;
  background: var(--gradient);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: white;
  padding: 2rem;
  clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
  margin-bottom: 5rem;
}

.header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100px;
  background: var(--light);
  clip-path: polygon(0 85%, 100% 0, 100% 100%, 0 100%);
}

.header h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
  animation: fadeInDown 1s ease;
}

.header p {
  font-size: 1.2rem;
  max-width: 700px;
  margin-bottom: 2rem;
  animation: fadeIn 1.5s ease;
}

.notice {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgba(0,0,0,0.7);
  color: white;
  padding: 10px 20px;
  border-radius: 30px;
  font-size: 0.9rem;
  z-index: 1000;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.card {
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid rgba(0,0,0,0.1);
}

.card-body {
  padding: 1.5rem;
}

.card-title {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
  color: var(--primary);
}

.card-text {
  color: #666;
  margin-bottom: 1rem;
}

.nav-tabs {
  display: flex;
  margin-bottom: 2rem;
  border-bottom: 1px solid #ddd;
}

.nav-item {
  padding: 0.5rem 1rem;
  cursor: pointer;
  position: relative;
}

.nav-item.active {
  color: var(--accent);
}

.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--accent);
}

.content-section {
  margin-bottom: 4rem;
  padding: 2rem;
  background: white;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.content-section h2 {
  color: var(--primary);
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.5rem;
}

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

.content-section h3 {
  color: var(--secondary);
  margin: 1.5rem 0 1rem;
}

pre {
  background: #f5f5f5;
  padding: 1rem;
  border-radius: 5px;
  overflow-x: auto;
  margin: 1rem 0;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  border-left: 4px solid var(--accent);
}

code {
  font-family: 'Courier New', monospace;
  background: rgba(255,140,0,0.1);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  color: #d63384;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: var(--primary);
  color: white;
}

tr:nth-child(even) {
  background-color: #f2f2f2;
}

.footer {
  background: var(--dark);
  color: white;
  padding: 3rem 0;
  text-align: center;
  margin-top: 5rem;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInDown {
  from { 
    opacity: 0;
    transform: translateY(-20px);
  }
  to { 
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .header h1 {
    font-size: 2.5rem;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
}