* {
  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: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1100px;
  --radius: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-surface) 100%);
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

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

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

h2 {
  font-size: 2rem;
  color: var(--color-primary);
  margin-top: 2rem;
}

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

h4 {
  font-size: 1.25rem;
  margin-top: 1.25rem;
}

h5 {
  font-size: 1.125rem;
  margin-top: 1rem;
}

h6 {
  font-size: 1rem;
  margin-top: 1rem;
}

p {
  margin-bottom: 1rem;
}

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

a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.1);
}

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: linear-gradient(135deg, var(--color-surface) 0%, rgba(248, 250, 252, 0.5) 100%);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
  color: var(--color-text-muted);
  font-style: italic;
}

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

.site-header {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1), inset 0 -1px 0 rgba(255, 255, 255, 0.1);
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

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

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

.site-nav a {
  color: var(--color-surface);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.15);
  transition: background-color 0.2s ease, box-shadow 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15), inset 0 1px 2px rgba(255, 255, 255, 0.2);
  text-decoration: none;
  color: var(--color-bg);
}

.site-nav a:focus-visible {
  outline-color: var(--color-bg);
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.2);
}

.site-main {
  padding: 3rem 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: 2rem;
  padding: 0.75rem 1.25rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
  font-size: 0.875rem;
  flex-wrap: wrap;
}

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

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

.breadcrumbs::before {
  content: '🏠';
  margin-right: 0.25rem;
}

.card {
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-surface) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05), inset 0 1px 0 rgba(255, 255, 255, 0.8);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.8);
  border-color: var(--color-accent);
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

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: 600;
  border-bottom: 2px solid var(--color-secondary);
}

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

table tbody tr {
  background: var(--color-bg);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

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

table tbody tr:hover {
  background: rgba(56, 189, 248, 0.05);
  box-shadow: inset 0 0 0 2px rgba(56, 189, 248, 0.1);
}

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

details {
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg) 100%);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05), inset 0 1px 2px rgba(0, 0, 0, 0.03);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

details:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

details[open] {
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1), inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

summary {
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease, color 0.2s ease;
  user-select: none;
}

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

summary::after {
  content: '👇';
  font-size: 1.25rem;
  transition: transform 0.2s ease;
}

details[open] summary::after {
  transform: rotate(180deg);
}

summary:hover {
  background: rgba(56, 189, 248, 0.08);
  color: var(--color-accent);
}

details[open] summary {
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.05) 0%, rgba(56, 189, 248, 0.02) 100%);
}

details > *:not(summary) {
  padding: 1.5rem;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.site-footer {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
  color: var(--color-surface);
  padding: 3rem 0 2rem;
  margin-top: 4rem;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.15), 0 -4px 16px rgba(0, 0, 0, 0.1);
}

.site-footer a {
  color: var(--color-accent);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.site-footer a:hover {
  color: var(--color-bg);
  background: rgba(255, 255, 255, 0.1);
  text-decoration: none;
}

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

button, input[type="submit"], input[type="button"] {
  font-family: var(--font-main);
  font-size: 1rem;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-primary) 100%);
  color: var(--color-bg);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.3), inset 0 1px 2px rgba(255, 255, 255, 0.2);
  transition: background-color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

button:hover, input[type="submit"]:hover, input[type="button"]:hover {
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4), inset 0 1px 2px rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

button:focus-visible, input[type="submit"]:focus-visible, input[type="button"]:focus-visible {
  outline: 2px solid var(--color-bg);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.3);
}

input[type="text"], input[type="email"], input[type="password"], input[type="search"], textarea, select {
  font-family: var(--font-main);
  font-size: 1rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  width: 100%;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1), inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

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

  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2.25rem;
  }

  h3 {
    font-size: 1.75rem;
  }

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

  .site-nav {
    gap: 1rem;
  }

  .card {
    padding: 2.5rem;
  }

  .container {
    padding: 0 2rem;
  }

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

@media (min-width: 1024px) {
  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.5rem;
  }

  .site-header .container {
    flex-wrap: nowrap;
  }

  .card {
    padding: 3rem;
  }

  .site-main {
    padding: 5rem 0;
  }

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

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

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

  button:hover, input[type="submit"]:hover, input[type="button"]:hover {
    transform: none;
  }
}

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

  body {
    background: white;
    color: black;
  }

  .site-main {
    padding: 0;
  }

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

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

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

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

  summary::after {
    display: none;
  }
}