:root {
  --primary-dark: #0D2F5C;
  --primary-light: #0A66C2;
  --accent: #34D399;
  --bg-gradient: linear-gradient(135deg, var(--primary-light), var(--accent));
  --text-light: #F8FAFC;
  --text-dark: #1E293B;
  --card-bg: rgba(255, 255, 255, 0.9);
  --section-padding: 80px 5%;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Roboto', system-ui, -apple-system, sans-serif;
}

body {
  background: #F1F5F9;
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

.header-banner {
  background: var(--bg-gradient);
  padding: 120px 5% 180px;
  position: relative;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
  margin-bottom: -60px;
}

.header-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center right/contain;
  opacity: 0.15;
}

.banner-content {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.banner-title {
  font-size: 3.5rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
  text-shadow: 0 2px 10px rgba(0,0,0,0.2);
  line-height: 1.2;
}

.banner-subtitle {
  color: rgba(255,255,255,0.9);
  font-size: 1.5rem;
  max-width: 700px;
  margin-bottom: 2rem;
}

.notice-badge {
  display: inline-block;
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(5px);
  padding: 8px 20px;
  border-radius: 50px;
  color: white;
  font-size: 0.9rem;
  margin-bottom: 30px;
  border: 1px solid rgba(255,255,255,0.3);
}

.main-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 5%;
  position: relative;
}

article {
  background: white;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  padding: 60px;
  margin-bottom: 80px;
  position: relative;
  z-index: 3;
}

article::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 20px;
  right: 20px;
  bottom: 20px;
  border: 1px solid rgba(13, 47, 92, 0.1);
  border-radius: 8px;
  pointer-events: none;
  z-index: -1;
}

h2 {
  color: var(--primary-dark);
  font-size: 2.2rem;
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 15px;
}

h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 4px;
  background: var(--bg-gradient);
  border-radius: 2px;
}

h3 {
  color: var(--primary-light);
  font-size: 1.8rem;
  margin: 2.5rem 0 1.5rem;
}

h4 {
  color: var(--accent);
  font-size: 1.4rem;
  margin: 2rem 0 1rem;
}

p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  line-height: 1.7;
}

table {
  width: 100%;
  margin: 2rem 0;
  border-collapse: collapse;
  background: var(--card-bg);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

th {
  background: var(--primary-dark);
  color: white;
  padding: 15px;
  text-align: left;
}

td {
  padding: 0;
}

pre {
  margin: 0;
  padding: 20px;
  background: #1E293B;
  color: #E2E8F0;
  border-radius: 0 0 8px 8px;
  overflow-x: auto;
}

code {
  font-family: 'Fira Code', monospace;
  font-size: 0.95rem;
}

.graphic-container {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  margin: 3rem 0;
  justify-content: center;
}

.graphic-item {
  width: 300px;
  height: 300px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0,0,0,0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
}

.graphic-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.graphic-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.graphic-item:hover img {
  transform: scale(1.05);
}

.nav-tabs {
  display: flex;
  gap: 10px;
  margin: 2rem 0;
  flex-wrap: wrap;
}

.nav-tab {
  padding: 10px 20px;
  background: var(--card-bg);
  border-radius: 50px;
  color: var(--primary-dark);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 1px solid rgba(13, 47, 92, 0.1);
}

.nav-tab:hover {
  background: var(--primary-light);
  color: white;
}

.footer {
  background: var(--primary-dark);
  color: white;
  padding: 60px 5%;
  text-align: center;
  margin-top: 80px;
  clip-path: polygon(0 10%, 100% 0, 100% 100%, 0% 100%);
}

.footer p {
  opacity: 0.8;
  max-width: 700px;
  margin: 0 auto 2rem;
}

@media (max-width: 1024px) {
  .header-banner {
    padding: 100px 5% 150px;
  }
  
  .banner-title {
    font-size: 2.8rem;
  }
  
  article {
    padding: 40px;
  }
}

@media (max-width: 768px) {
  .header-banner {
    padding: 80px 5% 120px;
    clip-path: polygon(0 0, 100% 0, 100% 95%, 0 100%);
  }
  
  .banner-title {
    font-size: 2.2rem;
  }
  
  .banner-subtitle {
    font-size: 1.2rem;
  }
  
  article {
    padding: 30px 20px;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  h3 {
    font-size: 1.5rem;
  }
  
  .graphic-item {
    width: 100%;
    max-width: 300px;
  }
}

@media (max-width: 480px) {
  .header-banner {
    padding: 60px 5% 100px;
  }
  
  .banner-title {
    font-size: 1.8rem;
  }
  
  h2 {
    font-size: 1.6rem;
  }
}