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

:root {
  --color-primary: #2563eb;
  --color-secondary: #1d4ed8;
  --color-accent: #bfdbfe;
  --color-bg: #ffffff;
  --color-surface: #eff6ff;
  --color-text: #172554;
  --color-text-muted: #6080b0;
  --color-border: #c8daf0;
  --font-main: 'Georgia', 'Times New Roman', 'Palatino', serif;
  --max-width: 1100px;
  --radius: 20px;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: radial-gradient(circle, var(--color-surface) 1px, transparent 1px);
  background-size: 20px 20px;
  line-height: 1.7;
  font-size: 18px;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text);
}

h1 {
  font-size: 2.75rem;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 2.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 3px dashed var(--color-border);
}

h3 {
  font-size: 1.875rem;
  color: var(--color-primary);
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  font-size: 1.125rem;
  color: var(--color-text-muted);
}

p {
  margin-bottom: 1.25rem;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 2px dotted var(--color-primary);
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
  padding: 2px 4px;
  border-radius: 6px;
}

a:hover {
  color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
  background-color: var(--color-accent);
}

a:focus-visible {
  outline: 3px dotted var(--color-primary);
  outline-offset: 4px;
  background-color: var(--color-accent);
}

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

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

blockquote {
  margin: 2rem 0;
  padding: 1.5rem 2rem;
  background: linear-gradient(to bottom, var(--color-surface), var(--color-bg));
  border-left: 6px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--color-text-muted);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

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

.site-header {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg) 100%);
  border-bottom: 4px dotted var(--color-border);
  padding: 2rem 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.06);
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent), var(--color-primary));
  opacity: 0.3;
}

.site-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 0;
}

.site-nav a {
  padding: 0.75rem 1.5rem;
  border: 2px dotted var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-weight: 600;
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
  border-bottom: 2px dotted var(--color-border);
}

.site-nav a:hover {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  border-color: var(--color-primary);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
  transform: translateY(-2px);
}

.site-nav a:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 4px;
}

.site-main {
  min-height: 70vh;
  padding: 3rem 1rem;
}

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

.breadcrumbs {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 2rem;
  padding: 1rem;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  border: 2px dashed var(--color-border);
  flex-wrap: wrap;
}

.breadcrumbs::before {
  content: '🏠';
  font-size: 1.2rem;
}

.breadcrumbs a {
  color: var(--color-text-muted);
  border-bottom: 1px dotted var(--color-text-muted);
}

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

.breadcrumbs::after {
  content: none;
}

.card {
  background: linear-gradient(to bottom right, var(--color-bg), var(--color-surface));
  border: 3px dotted var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.08);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  background-image: radial-gradient(circle at 20% 30%, var(--color-accent) 1px, transparent 1px),
                    radial-gradient(circle at 80% 70%, var(--color-accent) 1px, transparent 1px);
  background-size: 40px 40px;
}

.card:hover {
  box-shadow: 0 12px 32px rgba(37, 99, 235, 0.15);
  border-color: var(--color-primary);
}

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

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  border: 3px dotted var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-bg);
}

table thead {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
}

table th {
  padding: 1rem;
  text-align: left;
  font-weight: 700;
  border-bottom: 3px dashed white;
}

table td {
  padding: 1rem;
  border-bottom: 2px dotted var(--color-border);
}

table tbody tr {
  transition: background-color 0.2s ease;
  background-image: radial-gradient(circle, var(--color-surface) 0.5px, transparent 0.5px);
  background-size: 15px 15px;
}

table tbody tr:nth-child(even) {
  background-color: var(--color-surface);
  background-image: radial-gradient(circle, var(--color-accent) 0.5px, var(--color-surface) 0.5px);
  background-size: 15px 15px;
}

table tbody tr:hover {
  background-color: var(--color-accent);
  background-image: none;
}

table tbody tr:last-child td {
  border-bottom: none;
}

details {
  margin: 1.5rem 0;
  border: 3px dotted var(--color-border);
  border-radius: var(--radius);
  background: linear-gradient(to right, var(--color-surface), var(--color-bg));
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

details:hover {
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.1);
}

details[open] {
  border-color: var(--color-primary);
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.15);
}

summary {
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--color-primary);
  list-style: none;
  background-image: radial-gradient(circle, var(--color-accent) 1px, transparent 1px);
  background-size: 20px 20px;
  transition: background-color 0.2s ease, color 0.2s ease;
  border-radius: var(--radius);
}

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

summary::before {
  content: '▸ ';
  display: inline-block;
  transition: transform 0.2s ease;
  font-size: 1.2rem;
}

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

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

summary:focus-visible {
  outline: 3px dotted var(--color-primary);
  outline-offset: 4px;
}

details div {
  padding: 1.5rem;
  border-top: 2px dashed var(--color-border);
  animation: slideDown 0.2s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.site-footer {
  background: linear-gradient(to top, var(--color-surface) 0%, var(--color-bg) 100%);
  border-top: 4px dotted var(--color-border);
  padding: 3rem 1rem 2rem;
  margin-top: 4rem;
  text-align: center;
  color: var(--color-text-muted);
  background-image: radial-gradient(circle, var(--color-accent) 1px, transparent 1px);
  background-size: 25px 25px;
}

.site-footer::before {
  content: '';
  display: block;
  width: 100px;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  margin: 0 auto 2rem;
  border-radius: 10px;
}

.site-footer a {
  color: var(--color-primary);
  font-weight: 600;
}

.site-footer p {
  margin-bottom: 0.5rem;
}

input[type="text"],
input[type="email"],
input[type="search"],
textarea,
select {
  width: 100%;
  padding: 0.875rem 1.25rem;
  border: 3px dotted var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-main);
  font-size: 1rem;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  background-image: radial-gradient(circle, var(--color-surface) 0.5px, var(--color-bg) 0.5px);
  background-size: 15px 15px;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
  background-color: var(--color-surface);
}

button,
input[type="submit"],
input[type="button"] {
  padding: 0.875rem 2rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  border: 3px dotted var(--color-primary);
  border-radius: var(--radius);
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: box-shadow 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.2);
}

button:hover,
input[type="submit"]:hover,
input[type="button"]:hover {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
  border-color: var(--color-secondary);
}

button:focus-visible,
input[type="submit"]:focus-visible,
input[type="button"]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 4px;
}

button:active,
input[type="submit"]:active,
input[type="button"]:active {
  transform: translateY(2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

@media (min-width: 768px) {
  body {
    font-size: 19px;
  }

  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.75rem;
  }

  h3 {
    font-size: 2.25rem;
  }

  .site-header {
    padding: 2.5rem 2rem;
  }

  .site-nav {
    gap: 1rem;
  }

  .site-main {
    padding: 4rem 2rem;
  }

  .container {
    padding: 0 2rem;
  }

  .card {
    padding: 2.5rem;
  }

  table th,
  table td {
    padding: 1.25rem;
  }
}

@media (min-width: 1024px) {
  body {
    font-size: 20px;
  }

  h1 {
    font-size: 4rem;
  }

  .site-header {
    padding: 3rem 2rem;
  }

  .site-nav {
    gap: 1.5rem;
  }

  .site-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .card {
    padding: 3rem;
  }

  details div {
    padding: 2rem;
  }
}

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

  details[open] summary::before {
    transform: none;
  }
}

@media print {
  body {
    background: white;
    background-image: none;
  }

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

  .site-main {
    padding: 0;
  }

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

  .card {
    border: 2px solid var(--color-border);
    box-shadow: none;
    page-break-inside: avoid;
    background: white;
    background-image: none;
  }

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

  a::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: var(--color-text-muted);
  }

  table {
    border: 2px solid var(--color-border);
    page-break-inside: avoid;
  }

  details {
    border: 2px solid var(--color-border);
  }

  details[open] summary ~ * {
    display: block;
  }
}