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

:root {
  --color-primary: #475569;
  --color-secondary: #1e293b;
  --color-accent: #38bdf8;
  --color-bg: #ffffff;
  --color-surface: #f8fafc;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --font-main: 'Courier New', 'Lucida Console', Monaco, monospace;
  --max-width: 1100px;
  --radius: 8px;
  --shadow-sm: inset 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -2px rgba(15, 23, 42, 0.05);
  --gradient-subtle: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
  --gradient-accent: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 100%);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--gradient-subtle);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: var(--color-secondary);
}

h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
  background: var(--gradient-accent);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 2px 4px rgba(56, 189, 248, 0.1);
}

h2 {
  font-size: 1.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--color-accent);
  margin-top: 2rem;
}

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

h4 {
  font-size: 1.25rem;
  color: var(--color-primary);
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
  border-bottom: 2px solid transparent;
}

a:hover {
  color: #0ea5e9;
  border-bottom-color: #0ea5e9;
}

a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

strong {
  font-weight: 700;
  color: var(--color-secondary);
}

em {
  font-style: italic;
  color: var(--color-primary);
}

blockquote {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  background: var(--color-surface);
  border-left: 5px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow-sm);
  font-style: italic;
  color: var(--color-primary);
}

blockquote p:last-child {
  margin-bottom: 0;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

.site-header {
  background: var(--color-bg);
  border-bottom: 2px solid var(--color-border);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: box-shadow 0.2s ease;
}

.site-header:hover {
  box-shadow: var(--shadow-lg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
  width: 100%;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-nav a {
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  border-bottom: none;
  font-weight: 600;
  background: transparent;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.site-nav a:hover {
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.site-nav a:focus-visible {
  box-shadow: 0 0 0 3px var(--color-accent);
}

.site-main {
  flex: 1;
  padding: 2rem 0;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1.5rem;
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  font-size: 0.875rem;
  box-shadow: var(--shadow-sm);
}

.breadcrumbs a {
  color: var(--color-text-muted);
  border-bottom: none;
}

.breadcrumbs a:hover {
  color: var(--color-accent);
}

.breadcrumbs span {
  color: var(--color-text-muted);
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}

.card h2, .card h3 {
  margin-top: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background: var(--color-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

thead {
  background: var(--gradient-accent);
}

thead th {
  color: var(--color-bg);
  font-weight: 700;
  text-align: left;
  padding: 1rem;
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
}

tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.2s ease;
}

tbody tr:nth-child(even) {
  background: var(--color-surface);
}

tbody tr:hover {
  background: #e0f2fe;
}

tbody td {
  padding: 1rem;
  color: var(--color-text);
}

tbody td:first-child {
  font-weight: 600;
  color: var(--color-secondary);
}

details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

details:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

details[open] {
  background: var(--color-bg);
  box-shadow: var(--shadow-md);
}

summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--color-secondary);
  padding: 0.5rem;
  margin: -0.5rem;
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

summary::-webkit-details-marker {
  display: none;
}

summary::before {
  content: '▶';
  display: inline-block;
  transition: transform 0.2s ease;
  color: var(--color-accent);
  font-size: 0.75rem;
}

details[open] summary::before {
  transform: rotate(90deg);
}

summary:hover {
  background: var(--color-surface);
  color: var(--color-accent);
}

details[open] summary {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--color-border);
}

.site-footer {
  background: var(--color-secondary);
  color: var(--color-surface);
  padding: 2rem 0;
  margin-top: 3rem;
  border-top: 4px solid var(--color-accent);
  box-shadow: inset 0 4px 6px rgba(0, 0, 0, 0.1);
}

.site-footer a {
  color: var(--color-accent);
  border-bottom-color: transparent;
}

.site-footer a:hover {
  color: #7dd3fc;
  border-bottom-color: #7dd3fc;
}

.site-footer p {
  color: var(--color-text-muted);
}

ul, ol {
  margin: 1rem 0;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

ul li::marker {
  color: var(--color-accent);
}

ol li::marker {
  color: var(--color-accent);
  font-weight: 700;
}

code {
  background: var(--color-surface);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  font-family: var(--font-main);
  font-size: 0.875rem;
  color: var(--color-secondary);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

pre {
  background: var(--color-secondary);
  color: var(--color-surface);
  padding: 1.25rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-md);
  border-left: 4px solid var(--color-accent);
}

pre code {
  background: transparent;
  padding: 0;
  border: none;
  color: var(--color-surface);
  box-shadow: none;
}

hr {
  border: none;
  border-top: 2px solid var(--color-border);
  margin: 2rem 0;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  height: 2px;
}

img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

button, input, select, textarea {
  font-family: var(--font-main);
  font-size: 1rem;
  color: var(--color-text);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  background: var(--color-bg);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

button:hover, input:hover, select:hover, textarea:hover {
  border-color: var(--color-accent);
}

button:focus, input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

button {
  background: var(--gradient-accent);
  color: var(--color-bg);
  font-weight: 700;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-md);
}

button:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

@media (min-width: 768px) {
  html {
    font-size: 18px;
  }

  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }

  h3 {
    font-size: 1.75rem;
  }

  .site-nav {
    flex-wrap: nowrap;
  }

  .site-main {
    padding: 3rem 0;
  }

  .container {
    padding: 0 2rem;
  }

  .card {
    padding: 2rem;
  }

  table {
    font-size: 1rem;
  }

  tbody td, thead th {
    padding: 1.25rem;
  }
}

@media (min-width: 1024px) {
  .site-main {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 2rem;
  }

  .site-footer {
    padding: 3rem 0;
  }

  blockquote {
    padding: 1.5rem 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  .site-header, .site-nav, .site-footer, .breadcrumbs {
    display: none;
  }

  .site-main {
    padding: 0;
    max-width: 100%;
  }

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

  body {
    background: white;
    color: black;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }

  table {
    page-break-inside: avoid;
  }
}