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/* Modern CSS for Academic Website */
:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --bg-color: #ffffff;
  --bg-light: #f8fafc;
  --border-color: #e5e7eb;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
  box-sizing: border-box;
}

body {
  background: var(--bg-color);
  margin: 0;
  padding: 20px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-color);
  max-width: 1200px;
  margin: 0 auto;
}

a {
  text-decoration: none;
  color: var(--primary-color);
  border-bottom: 1px solid transparent;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--primary-hover);
  border-bottom: 1px solid var(--primary-hover);
}

a:link { 
  color: var(--primary-color); 
}

/* Content layout improvements */
#content {
  background: var(--bg-color);
  text-align: left;
  min-height: 100vh;
  padding: 20px 0;
}

#menu {
  position: fixed;
  top: 20px;
  left: 20px;
  width: 200px;
  background: var(--bg-light);
  border-radius: 12px;
  padding: 20px;
  box-shadow: var(--shadow-lg);
  font-size: 14px;
  z-index: 100;
  border: 1px solid var(--border-color);
}

#top_menu {
  position: fixed;
  top: 20px;
  left: 260px;
  right: 20px;
  height: auto;
  background: var(--bg-light);
  border-radius: 12px;
  padding: 15px 20px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  z-index: 100;
}

#menu a {
  display: block;
  color: var(--text-color);
  width: 100%;
  padding: 8px 12px;
  margin: 4px 0;
  border-radius: 6px;
  border: none;
  transition: all 0.2s ease;
}

#menu a:hover {
  background: var(--primary-color);
  color: white;
  border: none;
  transform: translateX(4px);
}

#text {
  margin-left: 260px;
  padding-top: 100px;
  padding-right: 40px;
  width: auto;
}

#text_topic {
  margin-left: 300px;
  padding-top: 100px;
  padding-right: 40px;
  width: auto;
}

/* Modern heading styles */
h1 {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  color: white;
  font-size: 1.5rem;
  font-weight: 600;
  margin: 40px 0 20px 0;
  border-radius: 8px;
  box-shadow: var(--shadow);
  border: none;
}

h1 span {
  background: transparent;
  padding: 16px 24px;
  display: block;
  border: none;
}

h2 {
  color: var(--text-color);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 30px 0 15px 0;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-color);
}

/* Paragraph and text improvements */
p {
  text-align: left;
  margin: 16px 0;
  line-height: 1.7;
}

ul p {
  margin-top: 0;
}

/* Demo section styling */
#demo {
  text-align: center;
  background: var(--bg-light);
  padding: 30px;
  margin: 30px 0;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  text-indent: 0;
  box-shadow: var(--shadow);
}

/* Link list improvements */
DIV#linklist a {
  margin-right: 12px;
  padding: 6px 12px;
  border-radius: 6px;
  transition: all 0.2s ease;
}

DIV#linklist a:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-1px);
}

/* Content sections */
.content {
  background: var(--bg-color);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
}

/* Table improvements */
table {
  background: transparent;
  border-collapse: collapse;
  width: 100%;
  margin: 20px 0;
}

table td {
  padding: 12px;
  vertical-align: top;
}

/* Center navigation improvements */
.center {
  background: var(--bg-light);
  padding: 15px;
  border-radius: 12px;
  margin: 20px 0;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.center img {
  transition: all 0.2s ease;
  border-radius: 4px;
}

.center img:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow);
}

/* Links styling improvements */
.links {
  display: inline-block;
  padding: 6px 12px;
  margin: 2px;
  background: var(--bg-light);
  border-radius: 6px;
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
  font-size: 14px;
}

.links:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

/* Indented text styling */
.indented {
  padding-left: 40px;
  padding-right: 40px;
  background: var(--bg-light);
  border-radius: 8px;
  border-left: 4px solid var(--primary-color);
  margin: 20px 0;
}

/* Image styling */
img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

/* Book cover styling */
.bookcover {
  max-width: 150px !important;
  max-height: 200px !important;
  width: auto !important;
  height: auto !important;
  float: left;
  margin: 0 15px 15px 0;
  border-radius: 8px;
  box-shadow: var(--shadow);
  transition: all 0.2s ease;
}

.bookcover:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

/* Book block layout for better formatting */
.bookblock {
  overflow: hidden;
  margin: 20px 0;
  padding: 15px;
  background: var(--bg-light);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.booktitle {
  margin: 0;
  line-height: 1.6;
}

/* Clear float after book covers */
.bookblock::after,
.content::after {
  content: "";
  display: table;
  clear: both;
}

/* Hide the main banner */
img[src="layout/main.png"] {
  display: none;
}

/* Blockquote styling */
blockquote {
  background: var(--bg-light);
  border-left: 4px solid var(--primary-color);
  padding: 20px;
  margin: 20px 0;
  border-radius: 0 8px 8px 0;
  font-style: italic;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
  body {
    padding: 10px;
  }
  
  #menu {
    position: static;
    width: 100%;
    margin-bottom: 20px;
  }
  
  #top_menu {
    position: static;
    left: auto;
    right: auto;
    margin-bottom: 20px;
  }
  
  #text, #text_topic {
    margin-left: 0;
    padding-top: 20px;
    padding-right: 0;
  }
  
  h1 {
    font-size: 1.25rem;
  }
  
  .indented {
    padding-left: 20px;
    padding-right: 20px;
  }
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Focus styles for accessibility */
a:focus, button:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  #menu, #top_menu {
    display: none;
  }
  
  #text, #text_topic {
    margin-left: 0;
    padding-top: 0;
  }
  
  a {
    color: black;
    text-decoration: underline;
  }
}