/* ============================================
   HF-IntelliCare Custom Theme
   Blue-grey tech medical professional style
   Nature/NEJM-level publication aesthetics
   ============================================ */

/* CSS Variables - Medical Tech Palette */
:root {
  --hf-primary: #1e3a5f;        /* Deep medical blue */
  --hf-primary-light: #3b82f6;  /* Accent blue */
  --hf-secondary: #334155;      /* Slate */
  --hf-accent: #22c55e;         /* Intervention green */
  --hf-warning: #f59e0b;        /* Feedback amber */
  --hf-purple: #8b5cf6;         /* Optimization purple */
  --hf-bg: #0f172a;             /* Dark navy background */
  --hf-surface: #1e293b;        /* Card surface */
  --hf-text: #e2e8f0;           /* Primary text */
  --hf-text-muted: #94a3b8;     /* Muted text */
  --hf-border: #475569;         /* Borders */
  --hf-code-bg: #1e293b;
  --hf-link: #60a5fa;
}

/* Base Typography - Professional mixed Chinese/English */
body {
  font-family: "Inter", "Noto Sans SC", "Noto Sans", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #1e293b;
  background-color: #f8fafc;
}

/* Headings - High information density, strong hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--hf-primary);
  line-height: 1.3;
  margin-top: 2em;
  margin-bottom: 0.8em;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.25rem; border-bottom: 3px solid var(--hf-primary-light); padding-bottom: 0.4em; }
h2 { font-size: 1.75rem; border-bottom: 1px solid var(--hf-border); padding-bottom: 0.3em; }
h3 { font-size: 1.35rem; color: var(--hf-secondary); }
h4 { font-size: 1.15rem; color: var(--hf-secondary); font-weight: 600; }

/* Links */
a {
  color: var(--hf-primary-light);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--hf-primary);
  text-decoration: underline;
}

/* Code & Pre */
code {
  font-family: "JetBrains Mono", "Fira Code", "SF Mono", Menlo, monospace;
  font-size: 0.92em;
  background-color: var(--hf-code-bg);
  color: #e2e8f0;
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

pre {
  background-color: var(--hf-bg);
  border: 1px solid var(--hf-border);
  border-radius: 8px;
  padding: 1.2em;
  overflow-x: auto;
  font-size: 0.9em;
  line-height: 1.6;
}

/* Tables - High density medical data style */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.95em;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

th {
  background-color: var(--hf-primary);
  color: #f8fafc;
  font-weight: 600;
  text-align: left;
  padding: 0.75em 1em;
  border: 1px solid var(--hf-primary);
}

td {
  padding: 0.65em 1em;
  border: 1px solid var(--hf-border);
  background-color: #ffffff;
}

tr:nth-child(even) td {
  background-color: #f1f5f9;
}

/* Blockquotes - Key takeaways & clinical notes */
blockquote {
  border-left: 5px solid var(--hf-primary-light);
  background-color: #f0f9ff;
  padding: 1em 1.5em;
  margin: 1.5em 0;
  color: #1e3a5f;
  font-style: normal;
}

blockquote p {
  margin: 0;
}

/* Mermaid Diagrams - Container styling */
.mermaid {
  background-color: #ffffff;
  border: 1px solid var(--hf-border);
  border-radius: 8px;
  padding: 1.5em;
  margin: 1.5em 0;
  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

/* Force all Mermaid text to black */
.mermaid .nodeLabel,
.mermaid .edgeLabel,
.mermaid text {
  fill: #000000 !important;
}

/* MathJax - Clean rendering */
mjx-container {
  overflow-x: auto;
  padding: 0.4em 0;
  margin: 0.3em 0;
}

mjx-container[display="true"] {
  margin: 0.8em 0;
  text-align: center;
}

/* KaTeX - Prevent flash of raw LaTeX and fix display math layout */

/* Hide raw LaTeX before KaTeX auto-render processes it */
.katex-pending {
  visibility: hidden;
  min-height: 1.5em;
}

/* Hide unprocessed $$ delimiters that KaTeX hasn't reached yet */
p:not(.katex-rendered):has(+ p > .katex-display),
.katex-display > .katex::before {
  content: none;
}

/* Display math container styling */
p:has(> .katex-display) {
  text-align: center;
  margin: 1em 0;
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.4em 0;
}

.katex {
  font-size: 1.1em;
}

/* Prevent triple rendering: hide raw $ and $$ text nodes in paragraphs
   that are being processed by KaTeX */
.katex-pending::before,
.katex-pending::after {
  content: none;
}

/* Sidebar Navigation */
.sidebar {
  background-color: var(--hf-bg);
  color: var(--hf-text);
  border-right: 1px solid var(--hf-border);
}

.sidebar .chapter-item a {
  color: var(--hf-text);
  font-size: 0.95em;
}

.sidebar .chapter-item a:hover {
  color: var(--hf-primary-light);
  background-color: var(--hf-surface);
}

/* Content Area */
.content {
  max-width: 860px;
  margin: 0 auto;
  padding: 2em 3em;
}

/* Footer */
footer {
  border-top: 1px solid var(--hf-border);
  color: var(--hf-text-muted);
  font-size: 0.85em;
}

/* Dark Mode Overrides (navy theme) */
@media (prefers-color-scheme: dark) {
  body {
    background-color: #0f172a;
    color: #e2e8f0;
  }
  
  h1, h2, h3 {
    color: #60a5fa;
  }
  
  table td {
    background-color: #1e293b;
  }
  
  tr:nth-child(even) td {
    background-color: #334155;
  }
  
  blockquote {
    background-color: #1e3a5f;
    border-left-color: #3b82f6;
    color: #e0f2fe;
  }
}

/* Print / PDF Optimization */
@media print {
  .sidebar, nav, footer {
    display: none;
  }
  
  body {
    background: white;
    color: black;
    font-size: 11pt;
  }
  
  h1, h2 {
    page-break-after: avoid;
  }
  
  table, pre, .mermaid {
    page-break-inside: avoid;
  }
  
  .content {
    max-width: 100%;
    padding: 0;
  }
}

/* Utility: Key Takeaways box */
.key-takeaways {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 1px solid #bae6fd;
  border-radius: 8px;
  padding: 1.5em;
  margin: 2em 0;
}

.key-takeaways h4 {
  margin-top: 0;
  color: var(--hf-primary);
}

/* High-density info cards */
.info-card {
  background: white;
  border: 1px solid var(--hf-border);
  border-radius: 6px;
  padding: 1.2em;
  margin: 1em 0;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.05);
}

/* Book Cover Page Styling */
.book-cover-page {
  text-align: center;
  padding: 3em 1em 4em;
  max-width: 100%;
}

.book-cover-page img {
  max-width: 100%;
  width: 100%;
  max-height: 680px;
  height: auto;
  object-fit: contain;
  border-radius: 12px;
  box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  margin-bottom: 2.5em;
}

/* Cover title */
.book-cover-page h1 {
  font-size: 2.8rem;
  margin: 0.5em 0 0.3em;
  color: var(--hf-primary);
  letter-spacing: -0.02em;
}

.book-cover-page p {
  font-size: 1.25rem;
  color: #475569;
  max-width: 620px;
  margin: 0 auto 1.5em;
  line-height: 1.6;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  .book-cover-page img {
    box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.4);
  }
  
  .book-cover-page h1 {
    color: #60a5fa;
  }
  
  .book-cover-page p {
    color: #94a3b8;
  }
}