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

:root {
  --color-primary: #0f4c75;
  --color-secondary: #1b262c;
  --color-accent: #bbe1fa;
  --color-bg: #ffffff;
  --color-surface: #f0f7ff;
  --color-text: #1b262c;
  --color-text-muted: #6b7b8d;
  --color-border: #d1dce6;
  --font-main: 'Trebuchet MS', 'Lucida Sans', 'Lucida Grande', sans-serif;
  --max-width: 1100px;
  --radius: 8px;
  --radius-sm: 4px;
  --radius-lg: 12px;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-surface) 100%);
  min-height: 100vh;
}

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

h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 2rem;
  color: var(--color-primary);
  position: relative;
  padding-bottom: 0.5rem;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, transparent 100%);
  border-radius: var(--radius-sm);
}

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

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
}

a:hover {
  color: var(--color-secondary);
}

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

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

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

blockquote {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-accent) 100%);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
  box-shadow: 0 2px 8px rgba(15, 76, 117, 0.1);
  font-style: italic;
  color: var(--color-text);
}

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

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

.site-header {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
  color: var(--color-bg);
  padding: 1.5rem 0;
  box-shadow: 0 4px 12px rgba(27, 38, 44, 0.15), 0 2px 4px rgba(27, 38, 44, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 3px solid var(--color-accent);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.site-header h1 {
  margin: 0;
  font-size: 1.75rem;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-bg) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.site-nav a {
  color: var(--color-bg);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  transition: background-color 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
  font-weight: 600;
}

.site-nav a:hover {
  background-color: rgba(187, 225, 250, 0.15);
  color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(187, 225, 250, 0.2);
}

.site-nav a:focus-visible {
  outline-color: var(--color-accent);
  background-color: rgba(187, 225, 250, 0.2);
}

.site-main {
  min-height: calc(100vh - 300px);
  padding: 2rem 0;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.breadcrumbs {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1.5rem;
  padding: 0.75rem 1rem;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(15, 76, 117, 0.08);
  flex-wrap: wrap;
}

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

.breadcrumbs a:hover {
  text-decoration: underline;
}

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

.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 8px rgba(15, 76, 117, 0.08), 0 4px 16px rgba(15, 76, 117, 0.04);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  background: linear-gradient(145deg, var(--color-bg) 0%, var(--color-surface) 100%);
}

.card:hover {
  box-shadow: 0 4px 16px rgba(15, 76, 117, 0.12), 0 8px 24px rgba(15, 76, 117, 0.08);
  border-color: var(--color-accent);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--color-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(15, 76, 117, 0.1), 0 4px 12px rgba(15, 76, 117, 0.05);
}

table thead {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-bg);
}

table th {
  padding: 1rem;
  text-align: left;
  font-weight: 700;
  border-bottom: 2px solid var(--color-accent);
}

table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

table tbody tr {
  transition: background-color 0.2s ease;
}

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

table tbody tr:hover {
  background-color: var(--color-accent);
  box-shadow: inset 0 0 0 1px var(--color-primary);
}

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

details {
  margin: 1rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-bg);
  box-shadow: 0 2px 6px rgba(15, 76, 117, 0.08);
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

details:hover {
  box-shadow: 0 4px 12px rgba(15, 76, 117, 0.12);
}

details[open] {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(15, 76, 117, 0.15);
}

summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--color-primary);
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg) 100%);
  transition: background-color 0.2s ease, color 0.2s ease;
  user-select: none;
  position: relative;
}

summary:hover {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-surface) 100%);
  color: var(--color-secondary);
}

summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

summary::marker {
  color: var(--color-primary);
}

details div {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
  animation: slideDown 0.2s ease;
}

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

.site-footer {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
  color: var(--color-bg);
  padding: 2rem 0 1rem;
  margin-top: 3rem;
  border-top: 3px solid var(--color-accent);
  box-shadow: 0 -4px 12px rgba(27, 38, 44, 0.15);
}

.site-footer p {
  margin: 0.5rem 0;
  color: var(--color-accent);
}

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

.site-footer a:hover {
  color: var(--color-bg);
  text-decoration: underline;
}

@media (max-width: 767px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .site-header h1 {
    font-size: 1.5rem;
    width: 100%;
    margin-bottom: 0.75rem;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
  }

  .site-nav a {
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
  }

  .container {
    padding: 0 1rem;
  }

  table {
    font-size: 0.9rem;
  }

  table th, table td {
    padding: 0.6rem 0.75rem;
  }
}

@media (min-width: 768px) {
  body {
    font-size: 17px;
  }

  .site-header {
    padding: 2rem 0;
  }

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

  .card {
    padding: 2rem;
  }

  .site-footer {
    padding: 3rem 0 1.5rem;
  }

  details div {
    padding: 1.5rem;
  }

  summary {
    padding: 1.25rem 1.5rem;
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2.25rem;
  }

  .site-header h1 {
    font-size: 2rem;
  }

  .site-main {
    padding: 4rem 0;
  }

  .card {
    padding: 2.5rem;
  }
}

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

  details div {
    animation: none;
  }
}

@media print {
  .site-header {
    position: static;
    box-shadow: none;
    border-bottom: 2px solid var(--color-text);
  }

  .site-nav {
    display: none;
  }

  .site-footer {
    border-top: 2px solid var(--color-text);
    box-shadow: none;
  }

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

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

  .card {
    box-shadow: none;
    border: 1px solid var(--color-text);
    page-break-inside: avoid;
  }

  a {
    text-decoration: underline;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    color: var(--color-text-muted);
  }

  details {
    border: 1px solid var(--color-text);
    box-shadow: none;
  }

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

  table {
    box-shadow: none;
  }

  .breadcrumbs {
    display: none;
  }
}