* {
  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: 'Georgia', 'Times New Roman', 'Palatino', serif;
  --max-width: 1100px;
  --radius: 6px;
  --shadow-sm: inset 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 2px 8px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 4px 16px rgba(15, 23, 42, 0.12);
  --transition-base: 0.2s ease;
}

body {
  font-family: var(--font-main);
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text);
  background: linear-gradient(to bottom, var(--color-bg) 0%, var(--color-surface) 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-main);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-secondary);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  text-shadow: 0 1px 2px rgba(15, 23, 42, 0.1);
  border-bottom: 3px solid var(--color-accent);
  padding-bottom: 0.75rem;
}

h2 {
  font-size: 2rem;
  margin-top: 2.5rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}

h3 {
  font-size: 1.5rem;
  margin-top: 2rem;
  color: var(--color-primary);
}

h4 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
  color: var(--color-primary);
}

h5 {
  font-size: 1.1rem;
  margin-top: 1.25rem;
}

h6 {
  font-size: 1rem;
  margin-top: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

p {
  margin-bottom: 1.25rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-base), border-color var(--transition-base);
}

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

a:focus-visible {
  outline: 2px 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);
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
  text-shadow: none;
}

blockquote {
  margin: 2rem 0;
  padding: 1.5rem 1.5rem 1.5rem 2rem;
  background: linear-gradient(to right, var(--color-surface) 0%, var(--color-bg) 100%);
  border-left: 5px solid var(--color-accent);
  border-radius: var(--radius);
  font-style: italic;
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  position: relative;
}

blockquote::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(to right, var(--color-accent), transparent);
}

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

.site-header h1 {
  color: var(--color-bg);
  border: none;
  margin: 0;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.site-nav {
  margin-top: 1.5rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--color-surface);
  padding: 0.5rem 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius);
  transition: background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), box-shadow var(--transition-base);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-sm);
}

.site-nav a:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  border-bottom-color: var(--color-accent);
}

.site-nav a:focus-visible {
  outline-color: var(--color-bg);
}

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

.site-main {
  padding: 3rem 0;
  min-height: 60vh;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 2rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  box-shadow: var(--shadow-sm);
}

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

.breadcrumbs a:hover {
  color: var(--color-accent);
  border-bottom-style: solid;
}

.breadcrumbs::before {
  content: '→';
  margin-right: 0.5rem;
  color: var(--color-text-muted);
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(to right, var(--color-accent), var(--color-primary));
}

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

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

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

table thead {
  background: linear-gradient(to bottom, var(--color-secondary), var(--color-primary));
  color: var(--color-bg);
}

table th {
  padding: 1rem 1.25rem;
  text-align: left;
  font-weight: 700;
  border-bottom: 2px solid var(--color-accent);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

table tbody tr {
  transition: background-color var(--transition-base);
}

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

table tbody tr:hover {
  background: linear-gradient(to right, rgba(56, 189, 248, 0.08), transparent);
}

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: var(--color-bg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

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

summary {
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--color-secondary);
  background: linear-gradient(to right, var(--color-surface), var(--color-bg));
  border-bottom: 1px solid transparent;
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
  user-select: none;
  position: relative;
}

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

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

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

details[open] summary {
  border-bottom-color: var(--color-border);
  background: var(--color-surface);
}

details div {
  padding: 1.5rem;
  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-surface);
  padding: 3rem 1.5rem 2rem;
  margin-top: 4rem;
  border-top: 3px solid var(--color-accent);
  box-shadow: 0 -4px 16px rgba(15, 23, 42, 0.1);
}

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

.site-footer a:hover {
  color: var(--color-bg);
  border-bottom-color: var(--color-bg);
}

.site-footer p {
  margin-bottom: 0.75rem;
  opacity: 0.9;
}

input,
textarea,
select,
button {
  font-family: var(--font-main);
  font-size: 1rem;
}

input[type="text"],
input[type="email"],
input[type="search"],
textarea,
select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  box-shadow: var(--shadow-sm);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="search"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

button,
.button {
  display: inline-block;
  padding: 0.75rem 2rem;
  background: linear-gradient(135deg, var(--color-accent) 0%, #0ea5e9 100%);
  color: var(--color-bg);
  border: none;
  border-radius: var(--radius);
  font-weight: 700;
  cursor: pointer;
  transition: background-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  box-shadow: var(--shadow-md);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

button:hover,
.button:hover {
  background: linear-gradient(135deg, #0ea5e9 0%, var(--color-accent) 100%);
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
  border-bottom-color: transparent;
}

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

ul,
ol {
  margin-bottom: 1.25rem;
  padding-left: 2rem;
}

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

hr {
  border: none;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--color-border), transparent);
  margin: 3rem 0;
}

code {
  font-family: 'Courier New', monospace;
  background: var(--color-surface);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-size: 0.9em;
  border: 1px solid var(--color-border);
  color: var(--color-secondary);
}

pre {
  background: var(--color-surface);
  padding: 1.5rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

pre code {
  background: none;
  padding: 0;
  border: none;
}

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

  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2.25rem;
  }

  h3 {
    font-size: 1.75rem;
  }

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

  .site-nav {
    margin-top: 2rem;
    gap: 1rem;
  }

  .container {
    padding: 0 2rem;
  }

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

  .card {
    padding: 2.5rem;
  }

  table th,
  table td {
    padding: 1.25rem 1.5rem;
  }
}

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

  h2 {
    font-size: 2.5rem;
  }

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

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

  .site-footer {
    padding: 4rem 2rem 2.5rem;
  }

  .card {
    padding: 3rem;
  }

  blockquote {
    padding: 2rem 2rem 2rem 2.5rem;
    margin: 2.5rem 0;
  }
}

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

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

  .site-main {
    padding: 0;
    min-height: auto;
  }

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

  .card {
    box-shadow: none;
    border: 1px solid #000;
    page-break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  body {
    background: #fff;
    color: #000;
  }
}