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

:root {
  --color-primary: #7c3aed;
  --color-secondary: #5b21b6;
  --color-accent: #ddd6fe;
  --color-bg: #fefeff;
  --color-surface: #f5f3ff;
  --color-text: #2e1065;
  --color-text-muted: #7c6f9b;
  --color-border: #d8d0e8;
  --font-main: 'Georgia', 'Times New Roman', 'Palatino', serif;
  --max-width: 1100px;
  --radius: 8px;
  --shadow-sm: inset 0 1px 3px rgba(91, 33, 182, 0.08);
  --shadow-md: 0 4px 6px rgba(124, 58, 237, 0.1);
  --shadow-lg: 0 10px 20px rgba(124, 58, 237, 0.15);
  --transition: 0.2s ease;
}

body {
  font-family: var(--font-main);
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text);
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-surface) 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
  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;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.5rem;
}

h3 {
  font-size: 1.6rem;
}

h4 {
  font-size: 1.3rem;
}

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1.2rem;
}

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

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

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

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

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

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

blockquote {
  margin: 2rem 0;
  padding: 1.5rem 2rem;
  background: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  font-style: italic;
  color: var(--color-text-muted);
}

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

.site-header {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(245, 243, 255, 0.95) 100%);
  border-bottom: 2px solid var(--color-border);
  padding: 1.5rem 0;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.site-header .container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

.site-header h1 {
  margin-bottom: 0;
  font-size: 2rem;
}

.site-nav {
  width: 100%;
}

.site-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  align-items: center;
}

.site-nav a {
  display: block;
  padding: 0.6rem 1.2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.site-nav a:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
}

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

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

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

.card {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.card h2, .card h3, .card h4 {
  margin-top: 0;
}

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

table thead {
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: white;
}

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

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

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

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

table tbody tr:hover {
  background: var(--color-accent);
}

details {
  margin: 1.5rem 0;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: white;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

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

summary {
  padding: 1.2rem 1.5rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--color-secondary);
  background: linear-gradient(90deg, var(--color-surface) 0%, white 100%);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
  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 var(--transition);
  color: var(--color-primary);
}

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

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

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

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

details > *:not(summary) {
  padding: 1.5rem;
  animation: fadeIn 0.3s ease;
}

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

.site-footer {
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-accent) 100%);
  border-top: 2px solid var(--color-border);
  padding: 2rem 0;
  margin-top: 4rem;
  box-shadow: inset 0 4px 6px rgba(91, 33, 182, 0.08);
}

.site-footer p {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

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

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

ul:not(.site-nav ul) {
  margin: 1rem 0 1rem 2rem;
}

ol {
  margin: 1rem 0 1rem 2rem;
}

li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

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

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

img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-border);
}

hr {
  border: none;
  border-top: 2px solid var(--color-border);
  margin: 2rem 0;
  box-shadow: var(--shadow-sm);
}

code {
  font-family: 'Courier New', monospace;
  background: var(--color-surface);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  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;
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  margin: 1.5rem 0;
}

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

button, input[type="submit"], input[type="button"] {
  font-family: var(--font-main);
  padding: 0.8rem 1.5rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: white;
  border: 2px solid var(--color-secondary);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
}

button:hover, input[type="submit"]:hover, input[type="button"]:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

button:focus-visible, input[type="submit"]:focus-visible, input[type="button"]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

input[type="text"], input[type="email"], input[type="search"], textarea, select {
  font-family: var(--font-main);
  padding: 0.8rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  background: white;
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}

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

textarea {
  resize: vertical;
  min-height: 120px;
}

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

  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2.3rem;
  }

  h3 {
    font-size: 1.8rem;
  }

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

  .site-header h1 {
    font-size: 2.5rem;
  }

  .site-nav {
    width: auto;
  }

  .site-nav ul {
    gap: 1rem;
  }

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

  .card {
    padding: 2.5rem;
  }

  table th, table td {
    padding: 1.2rem;
  }
}

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

  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.5rem;
  }

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

  .container {
    padding: 0 2rem;
  }

  .card {
    padding: 3rem;
  }

  blockquote {
    padding: 2rem 3rem;
  }
}

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

  details > *:not(summary) {
    animation: none;
  }

  summary::before {
    transition: none;
  }
}

@media print {
  .site-header {
    position: static;
    box-shadow: none;
    border-bottom: 1px solid black;
  }

  .site-nav {
    display: none;
  }

  .site-footer {
    border-top: 1px solid black;
    box-shadow: none;
  }

  .breadcrumbs {
    display: none;
  }

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

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

  a {
    text-decoration: underline;
  }

  body {
    background: white;
  }

  table {
    box-shadow: none;
  }
}