@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
  /* Fluid Typographic & Spacing Scale */
  --font-size-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.1rem);
  --font-size-h1: clamp(2.1rem, 1.8rem + 1.2vw, 3rem);
  --font-size-h2: clamp(1.55rem, 1.4rem + 0.8vw, 2.1rem);
  --font-size-h3: clamp(1.25rem, 1.2rem + 0.4vw, 1.55rem);
  
  --spacing-fluid: clamp(1.5rem, 1rem + 3vw, 4rem);
  
  /* Curated Slate + Indigo Aesthetic */
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  
  --text-main: #334155;
  --text-heading: #0f172a;
  --text-muted: #64748b;
  
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-bg: #e0e7ff;
  --primary-glow: rgba(79, 70, 229, 0.15);
  
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.04), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
  --shadow-lg: 0 20px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
  
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-main);
  background-color: var(--bg-body);
  line-height: 1.75;
  max-width: 880px;
  margin-left: 0;
  margin-right: auto;
  padding: var(--spacing-fluid) clamp(24px, 4vw, 48px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.25;
  margin-top: 2em;
  margin-bottom: 0.6em;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-h1);
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.4em;
  margin-top: 0;
  background: linear-gradient(135deg, var(--text-heading) 30%, #475569);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: var(--font-size-h2);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.4em;
}

h3 {
  font-size: var(--font-size-h3);
}

/* Paragraphs & Links */
p {
  margin-top: 0;
  margin-bottom: 1.4em;
  font-size: var(--font-size-base);
}

a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

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

/* Blockquotes */
blockquote {
  margin: 2em 0;
  padding: 18px 24px;
  border-left: 5px solid var(--primary);
  background: linear-gradient(90deg, #f5f3ff 0%, var(--bg-card) 100%);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: #3730a3;
  font-style: italic;
  box-shadow: var(--shadow-sm);
}

blockquote p {
  margin: 0;
}

/* Inline Code */
code {
  background-color: #f1f5f9;
  color: #0f172a;
  padding: 3px 6px;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.85em;
  font-weight: 500;
  border: 1px solid #e2e8f0;
}

/* Code Blocks Container & Copy Button (ChatGPT-like) */
.code-block-container {
  margin: 2em 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid #1e293b;
  background-color: #0f172a;
}

.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #1e293b;
  padding: 8px 20px;
  font-size: 0.75rem;
  color: #cbd5e1;
  border-bottom: 1px solid #2d3748;
}

.code-block-lang {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  text-transform: lowercase;
  font-weight: 600;
  color: #94a3b8;
}

.copy-code-button {
  background-color: transparent;
  color: #94a3b8;
  border: none;
  padding: 4px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  user-select: none;
}

.copy-code-button:hover {
  color: #f8fafc;
}

.copy-code-button.copied {
  color: #34d399; /* Smooth emerald green for confirmation */
}

/* Pre Code blocks & Custom Scrollbar */
pre {
  margin: 0;
}

pre code {
  padding: 20px 24px;
  border-radius: 0;
  display: block;
  overflow-x: auto;
  font-size: 0.875em;
  background-color: #090d16 !important; /* Slightly darker code background */
  color: #e2e8f0 !important;
  border: none;
}

/* Custom Sleek Scrollbar for Code Blocks */
pre::-webkit-scrollbar {
  height: 6px;
  width: 6px;
}

pre::-webkit-scrollbar-track {
  background: #090d16;
}

pre::-webkit-scrollbar-thumb {
  background: #334155;
  border-radius: 3px;
  transition: var(--transition);
}

pre::-webkit-scrollbar-thumb:hover {
  background: #475569;
}

/* Tables */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2em 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-hover); /* High contrast default border to prevent blending on white */
  box-shadow: var(--shadow-md);
  background-color: var(--bg-card);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

table:hover {
  border-color: #94a3b8; /* Crisp darker border on hover */
  box-shadow: var(--shadow-lg);
}

th, td {
  border: none !important;
  border-bottom: 1px solid var(--border) !important;
  padding: 16px 24px !important;
}

tr:last-child td {
  border-bottom: none !important;
}

th {
  background-color: #f1f5f9; /* Distinct header color for white bg */
  color: var(--text-heading);
  font-weight: 700;
  text-align: left;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  border-bottom: 2px solid var(--primary) !important; /* Vivid indigo divider for high contrast */
}

tr:nth-child(even) {
  background-color: #f8fafc;
}

tr:hover {
  background-color: rgba(79, 70, 229, 0.04); /* Elegant indigo glow on hover */
  transition: background-color 0.15s ease;
}

/* Lists */
ul, ol {
  padding-left: 24px;
  margin-bottom: 1.4em;
}

li {
  margin-bottom: 0.6em;
  transition: color 0.15s ease;
}

/* Task lists (Custom Interactive Checked States) */
li input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 1.15em;
  height: 1.15em;
  border: 2px solid var(--border-hover);
  border-radius: 4px;
  margin-right: 10px;
  vertical-align: middle;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  position: relative;
  background-color: var(--bg-card);
  transition: var(--transition);
}

li input[type="checkbox"]:checked {
  background-color: var(--primary);
  border-color: var(--primary);
}

li input[type="checkbox"]:checked::after {
  content: "";
  display: block;
  width: 4px;
  height: 8px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  position: absolute;
  top: 1px;
}

/* Definition List Card */
dl {
  border: 1px solid var(--border);
  padding: 28px;
  border-radius: var(--radius-md);
  background-color: var(--bg-card);
  box-shadow: var(--shadow-md);
  margin: 2em 0;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

dl:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
}

dt {
  font-weight: 700;
  font-size: 1.1em;
  margin-top: 1.2em;
  color: var(--text-heading);
}

dt:first-of-type {
  margin-top: 0;
}

dd {
  margin-left: 20px;
  color: var(--text-muted);
  margin-bottom: 0.8em;
}

dd:last-of-type {
  margin-bottom: 0;
}

/* Horizontal Rule */
hr {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border) 50%, transparent);
  margin: 2.5em 0;
}

/* Spoilers */
.spoiler {
  background-color: #cbd5e1;
  color: transparent;
  filter: blur(5px);
  border-radius: 4px;
  padding: 3px 8px;
  cursor: pointer;
  user-select: none;
  transition: filter 0.25s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.25s ease, color 0.25s ease;
}

.spoiler:hover {
  background-color: #94a3b8;
  filter: blur(4px);
}

.spoiler.revealed {
  background-color: #f1f5f9;
  color: inherit;
  filter: none;
  cursor: text;
  user-select: text;
}

/* Custom Callout Blocks (Containers) */
.custom-block {
  margin: 2em 0;
  padding: 20px 24px;
  border-left-width: 5px;
  border-left-style: solid;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-sm);
}

.custom-block-title {
  font-weight: 700;
  margin-bottom: 10px;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.custom-block p:last-child {
  margin-bottom: 0;
}

/* Alert Themes */
.custom-block.note {
  background-color: #eff6ff;
  border-left-color: #3b82f6;
  color: #1e40af;
}
.custom-block.note .custom-block-title {
  color: #2563eb;
}

.custom-block.warning {
  background-color: #fffbeb;
  border-left-color: #f59e0b;
  color: #92400e;
}
.custom-block.warning .custom-block-title {
  color: #d97706;
}

.custom-block.tip {
  background-color: #ecfdf5;
  border-left-color: #10b981;
  color: #065f46;
}
.custom-block.tip .custom-block-title {
  color: #059669;
}

.custom-block.caution {
  background-color: #fff1f2;
  border-left-color: #f43f5e;
  color: #9f1239;
}
.custom-block.caution .custom-block-title {
  color: #e11d48;
}

.custom-block.important {
  background-color: #f5f3ff;
  border-left-color: #8b5cf6;
  color: #5b21b6;
}
.custom-block.important .custom-block-title {
  color: #7c3aed;
}

/* Footnotes Section */
footer, .footnotes {
  margin-top: 4em;
  padding-top: 2em;
  border-top: 1px solid var(--border);
  font-size: 0.875em;
  color: var(--text-muted);
}

.footnotes ol {
  padding-left: 20px;
}

.footnotes li {
  margin-bottom: 0.8em;
}

.footnotes a {
  vertical-align: super;
}

/* Highly Optimized Print Stylesheet */
@media print {
  /* Enforce WebKit & standard print-color-adjust to preserve premium backgrounds, card colors, and shadows */
  * {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  body {
    background-color: #ffffff !important; /* Force plain white background for paper/PDF */
    color: var(--text-main) !important;
    padding: 0 !important;
    margin: 1.5cm !important; /* Standard print margins */
    font-size: 11pt !important;
  }
  
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid !important;
    break-after: avoid !important;
  }
  
  /* Clean, crisp collapsed tables for high-quality paper layout */
  table {
    border-collapse: collapse !important;
    border: 1px solid #cbd5e1 !important; /* Soft Slate 300 outer border */
    box-shadow: none !important; /* Shadows look messy on print */
    border-radius: 0 !important; /* Flat borders prevent cut-off rendering artifacts in PDF engines */
    background-color: #ffffff !important;
  }
  
  th, td {
    border: 1px solid #e2e8f0 !important; /* Light Slate 200 cell boundaries */
    padding: 10px 14px !important; /* Balanced margins */
  }
  
  th {
    border-bottom: 2px solid var(--primary) !important; /* Bold divider line preserved */
    background-color: #f1f5f9 !important;
  }
  
  /* Code Blocks: Light theme for ink-savings and high-contrast paper reading */
  pre code {
    background-color: #f8fafc !important;
    color: #0f172a !important;
    border: none !important;
    border-radius: 0 !important;
  }
  
  /* Code block header styled cleanly in light theme */
  .code-block-header {
    background-color: #f1f5f9 !important;
    color: var(--text-main) !important;
    border-bottom: 1px solid var(--border) !important;
  }
  
  .code-block-lang {
    color: var(--text-heading) !important;
  }
  
  .code-block-container {
    border: 1px solid var(--border) !important;
    background-color: #f8fafc !important;
    box-shadow: none !important;
  }
  
  /* Hide purely interactive controls on paper */
  .copy-code-button {
    display: none !important;
  }
  
  /* Unblur spoilers for print readability so the secret is legible in PDF */
  .spoiler {
    filter: none !important;
    color: var(--text-heading) !important;
    background-color: #f1f5f9 !important;
  }
}