:root {
  --primary: #0a192f;
  --secondary: #172a45;
  --accent: #64ffda;
  --text: #ccd6f6;
  --highlight: #1e90ff;
  --gradient: linear-gradient(135deg, #0a192f 0%, #1a2a45 100%);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Montserrat', sans-serif;
}

body {
  background: var(--gradient);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

.header {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(10, 25, 47, 0.8);
  z-index: 1;
}

.header-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem;
  max-width: 800px;
}

.header h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  background: linear-gradient(to right, #64ffda, #1e90ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 20px rgba(100, 255, 218, 0.3);
}

.header p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1.5rem 2rem;
  background: rgba(10, 25, 47, 0.8);
  backdrop-filter: blur(10px);
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
  transition: all 0.3s ease;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-links a:hover {
  color: var(--accent);
}

.wave {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 200%;
  height: 100px;
  background: url('https://images.gptkong.com/demo/sample3.png') repeat-x;
  background-size: 50% 100px;
  animation: wave 15s linear infinite;
  opacity: 0.6;
}

@keyframes wave {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.section {
  padding: 6rem 0;
  position: relative;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 3rem;
  text-align: center;
  position: relative;
  display: inline-block;
  left: 50%;
  transform: translateX(-50%);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
}

.card {
  background: rgba(23, 42, 69, 0.6);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 1.5rem;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

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

.code-container {
  position: relative;
  margin: 2rem 0;
  border-radius: 10px;
  overflow: hidden;
}

.code-header {
  background: rgba(23, 42, 69, 0.8);
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
}

.code-circle {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-right: 0.5rem;
}

.code-circle:nth-child(1) { background: #ff5f56; }
.code-circle:nth-child(2) { background: #ffbd2e; }
.code-circle:nth-child(3) { background: #27c93f; }

pre {
  margin: 0;
  padding: 1.5rem;
  background: rgba(10, 25, 47, 0.8);
  overflow-x: auto;
  tab-size: 2;
  font-family: 'Fira Code', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #e6f1ff;
  border-radius: 0 0 10px 10px;
}

.footer {
  background: rgba(10, 25, 47, 0.9);
  padding: 3rem 0;
  text-align: center;
}

.footer p {
  margin-bottom: 1rem;
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
  40% { transform: translateY(-20px) translateX(-50%); }
  60% { transform: translateY(-10px) translateX(-50%); }
}

.tooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px dotted var(--accent);
  cursor: help;
}

.tooltip .tooltiptext {
  visibility: hidden;
  width: 200px;
  background-color: var(--secondary);
  color: var(--text);
  text-align: center;
  border-radius: 6px;
  padding: 0.5rem;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0;
  transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
  visibility: visible;
  opacity: 1;
}

@media (max-width: 768px) {
  .header h1 {
    font-size: 2.5rem;
  }
  
  .nav-links {
    display: none;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
}

.notice {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgba(23, 42, 69, 0.9);
  padding: 1rem;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  max-width: 300px;
  animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}