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

body {
  font-family: "Georgia", "Times New Roman", Times, serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: #eee;
  padding: 20px;
}

.container {
  max-width: 900px;
  margin: 0 auto;
}

/* ===================================
           SCREEN STYLES (what you see in browser)
           =================================== */
.screen-only-header {
  background-color: #0f3460;
  padding: 1rem;
  border-radius: 1rem;
  margin-bottom: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.nav-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: #4a90e2;
  text-decoration: none;
}

.nav-links a:hover {
  text-decoration: underline;
}

.print-button {
  background-color: #4a90e2;
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 1rem;
}

.print-button:hover {
  background-color: #357abd;
}

.article {
  background-color: #0f3460;
  border-radius: 1rem;
  padding: 2rem;
  margin-bottom: 2rem;
}

.article h1 {
  font-size: clamp(1.75rem, 2rem + 1vw, 2.5rem);
  margin-bottom: 0.5rem;
  color: #4a90e2;
}

.article-meta {
  color: #aaa;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  border-bottom: 1px solid #1a1a2e;
  padding-bottom: 0.5rem;
}

.article h2 {
  margin: 1.5rem 0 0.5rem;
  color: #e94560;
}

.article p {
  line-height: 1.6;
  margin-bottom: 1rem;
  color: #ddd;
}

.article a {
  color: #4a90e2;
}

.advertisement {
  background: linear-gradient(135deg, #e94560, #c73b54);
  padding: 1rem;
  border-radius: 0.5rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.advertisement p {
  color: white;
  margin-bottom: 0;
}

.sidebar {
  background-color: #0f3460;
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.sidebar h3 {
  color: #4a90e2;
  margin-bottom: 0.5rem;
}

.sidebar ul {
  margin-left: 1.5rem;
  color: #aaa;
}

.sidebar li {
  margin: 0.5rem 0;
}

.footer {
  background-color: #0a0a1a;
  padding: 2rem;
  text-align: center;
  border-radius: 1rem;
  color: #666;
}

.code-block {
  background-color: #0a0a1a;
  padding: 1rem;
  border-radius: 0.75rem;
  font-family: "Courier New", monospace;
  font-size: 0.8rem;
  color: #82b1ff;
  overflow-x: auto;
  margin: 1rem 0;
}

/* ===================================
           PRINT STYLES (what happens when you print)
           This is the most important part!
           =================================== */
@media print {
  /* Reset everything for print */
  body {
    background: white;
    color: black;
    padding: 0;
    margin: 0;
    font-family: "Times New Roman", Times, serif;
    font-size: 12pt;
  }

  .container {
    max-width: 100%;
    margin: 0;
    padding: 0;
  }

  /* Hide non-essential elements */
  .screen-only-header,
  .print-button,
  .advertisement,
  .sidebar,
  .footer,
  .nav-links {
    display: none;
  }

  /* Article styling for print */
  .article {
    background: white;
    padding: 0;
    margin: 0;
    box-shadow: none;
  }

  .article h1 {
    color: black;
    font-size: 18pt;
    margin-top: 0;
  }

  .article h2 {
    color: black;
    font-size: 14pt;
  }

  .article p {
    color: black;
    line-height: 1.4;
  }

  /* Show full URLs after links */
  .article a {
    color: black;
    text-decoration: underline;
  }

  .article a[href]:after {
    content: " (" attr(href) ")";
    font-size: 10pt;
    color: #666;
  }

  /* Don't show URLs for internal links or mailto */
  .article a[href^="#"]:after,
  .article a[href^="mailto"]:after,
  .article a[href^="javascript"]:after {
    content: "";
  }

  /* Page breaks */
  h1,
  h2 {
    page-break-after: avoid;
  }

  p,
  li,
  figure {
    page-break-inside: avoid;
  }

  /* Force page break before conclusion */
  .page-break {
    page-break-before: always;
  }
}

.theory {
  background-color: #0a0a1a;
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.theory h2 {
  color: #4a90e2;
  margin-bottom: 1rem;
}

.theory h3 {
  color: #e94560;
  margin: 1.5rem 0 0.75rem;
}

.theory p {
  color: #ccc;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.theory ul {
  margin-left: 1.5rem;
  color: #ccc;
  line-height: 1.8;
}

.note {
  background-color: #1a1a2e;
  border-left: 4px solid #e94560;
  padding: 1rem;
  border-radius: 0.5rem;
  margin: 1rem 0;
}

footer {
  text-align: center;
  padding: 2rem;
  color: #666;
}