:root {
  --primary-color: #0D47A1;
  --secondary-color: #6200EA;
  --accent-color: #3DDC84;
  --highlight-color: #FFAB40;
  --dark-bg: #1E1E1E;
  --light-text: #FFFFFF;
  --dark-text: #333333;
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.8;
  color: var(--dark-text);
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
  min-height: 100%;
  overflow-x: hidden;
}

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

.header {
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  color: var(--light-text);
  padding: 2rem 0;
  text-align: center;
  margin-bottom: 3rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
}

.header::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.header h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.header p {
  font-size: 1.2rem;
  opacity: 0.9;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.notice {
  background: var(--accent-color);
  color: white;
  padding: 1rem;
  text-align: center;
  font-weight: bold;
  margin-bottom: 2rem;
  border-radius: 0 0 8px 8px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.navbar {
  position: sticky;
  top: 0;
  background: var(--primary-color);
  padding: 1rem 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: rgba(13, 71, 161, 0.95);
  backdrop-filter: blur(10px);
  padding: 0.5rem 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: var(--light-text);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: all 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--highlight-color);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--highlight-color);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

.nav-link:hover::after {
  width: 80%;
}

.main-content {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 2rem;
  margin: 2rem 0;
}

@media (max-width: 900px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}

.sidebar {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  height: fit-content;
  position: sticky;
  top: 80px;
}

.sidebar h3 {
  color: var(--secondary-color);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-color);
}

.sidebar-nav {
  list-style: none;
}

.sidebar-link {
  display: block;
  padding: 0.8rem 0;
  color: var(--dark-text);
  text-decoration: none;
  transition: all 0.3s ease;
  border-left: 3px solid transparent;
  padding-left: 1rem;
}

.sidebar-link:hover {
  color: var(--secondary-color);
  border-left: 3px solid var(--accent-color);
  padding-left: 1.5rem;
}

.content {
  background: white;
  border-radius: 8px;
  padding: 2rem;
  box-shadow: var(--card-shadow);
}

article h2 {
  color: var(--secondary-color);
  font-size: 1.8rem;
  margin: 2rem 0 1rem;
  position: relative;
  padding-bottom: 0.5rem;
}

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

article h3 {
  color: var(--primary-color);
  font-size: 1.5rem;
  margin: 1.5rem 0 1rem;
}

article p {
  margin-bottom: 1.2rem;
  font-size: 1.1rem;
  line-height: 1.8;
}

.code-container {
  background: #282c34;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  overflow: auto;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

pre {
  margin: 0;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 0.95rem;
  line-height: 1.5;
  color: #abb2bf;
}

code {
  font-family: inherit;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #5c6370;
}

.token.punctuation {
  color: #abb2bf;
}

.token.selector,
.token.tag {
  color: #e06c75;
}

.token.property,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.attr-name,
.token.deleted {
  color: #d19a66;
}

.token.string,
.token.char,
.token.attr-value,
.token.builtin,
.token.inserted {
  color: #98c379;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
  color: #56b6c2;
}

.token.atrule,
.token.keyword {
  color: #c678dd;
}

.token.function,
.token.class-name {
  color: #61afef;
}

.token.regex,
.token.important,
.token.variable {
  color: #e06c75;
}

.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.gallery-item {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
  position: relative;
}

.gallery-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

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

.table-container {
  overflow-x: auto;
  margin: 2rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  border-radius: 8px;
  overflow: hidden;
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid #e0e0e0;
}

th {
  background: var(--primary-color);
  color: white;
  font-weight: 500;
}

tr:nth-child(even) {
  background: #f8f9fa;
}

tr:hover {
  background: #f1f3f5;
}

.positive {
  color: var(--accent-color);
  font-weight: bold;
}

.negative {
  color: var(--highlight-color);
  font-weight: bold;
}

.footer {
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 3rem 0;
  margin-top: 3rem;
  text-align: center;
}

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 1.5rem 0;
}

.footer-link {
  color: white;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-link:hover {
  color: var(--highlight-color);
}

.copyright {
  opacity: 0.8;
  font-size: 0.9rem;
  margin-top: 1.5rem;
}

@media (max-width: 768px) {
  .header h1 {
    font-size: 2rem;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .footer-links {
    flex-wrap: wrap;
    gap: 1rem;
  }
}

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

.floating {
  animation: float 3s ease-in-out infinite;
}