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

:root {
  --color-primary: #4338ca;
  --color-secondary: #312e81;
  --color-accent: #c7d2fe;
  --color-bg: #ffffff;
  --color-surface: #f5f3ff;
  --color-text: #1e1b4b;
  --color-text-muted: #6366a0;
  --color-border: #d4d0e8;
  --font-main: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1100px;
  --radius: 8px;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-secondary);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

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;
}

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

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

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

em {
  font-style: italic;
}

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

blockquote {
  margin: 2rem 0;
  padding: 1.5rem 1.5rem 1.5rem 2rem;
  background-color: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  font-style: italic;
  color: var(--color-text-muted);
  position: relative;
  transform: translateX(20px);
}

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

.site-header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(67, 56, 202, 0.05);
}

.site-header .container {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 2rem;
  padding: 1rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.site-nav a {
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease;
  font-weight: 500;
}

.site-nav a:hover {
  background-color: var(--color-surface);
  text-decoration: none;
}

.site-main {
  min-height: calc(100vh - 200px);
}

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

.breadcrumbs {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding-left: 2rem;
  position: relative;
}

.breadcrumbs::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 1rem;
  height: 2px;
  background-color: var(--color-accent);
  transform: translateY(-50%);
}

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

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

.site-footer {
  background-color: var(--color-secondary);
  color: var(--color-accent);
  margin-top: 4rem;
  padding: 3rem 0 2rem;
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -20px;
  left: 10%;
  width: 60%;
  height: 40px;
  background-color: var(--color-primary);
  transform: skewY(-1deg);
}

.site-footer .container {
  display: grid;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

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

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

.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 12px rgba(49, 46, 129, 0.08);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
  position: relative;
}

.card::after {
  content: '';
  position: absolute;
  top: -8px;
  right: -8px;
  width: 40px;
  height: 40px;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  z-index: -1;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(49, 46, 129, 0.12);
  transform: translateY(-2px);
}

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

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

th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--color-primary);
}

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

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

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

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

details {
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-bg);
  position: relative;
  left: -10px;
}

summary {
  padding: 1.25rem 1.5rem;
  background-color: var(--color-surface);
  cursor: pointer;
  font-weight: 600;
  color: var(--color-secondary);
  transition: background-color 0.2s ease, color 0.2s ease;
  user-select: none;
  list-style: none;
  position: relative;
}

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

summary::after {
  content: '+';
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  font-weight: 300;
  transition: transform 0.2s ease;
}

details[open] summary::after {
  content: '−';
}

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

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

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

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

.grid-2 {
  display: grid;
  gap: 2rem;
  margin: 2rem 0;
}

.grid-3 {
  display: grid;
  gap: 2rem;
  margin: 2rem 0;
}

.grid-asymmetric {
  display: grid;
  gap: 2rem;
  margin: 3rem 0;
  position: relative;
}

.grid-offset {
  display: grid;
  gap: 2rem;
  margin: 3rem 0;
}

.grid-offset > *:nth-child(even) {
  transform: translateX(20px);
}

.grid-offset > *:nth-child(odd) {
  transform: translateX(-20px);
}

.overlap-section {
  position: relative;
  margin: 4rem 0;
  padding: 3rem 2rem;
  background-color: var(--color-surface);
  border-radius: var(--radius);
}

.overlap-section::before {
  content: '';
  position: absolute;
  top: -20px;
  right: 30px;
  width: 200px;
  height: 100%;
  background-color: var(--color-accent);
  border-radius: var(--radius);
  z-index: -1;
  opacity: 0.6;
}

.hero-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-bg);
  padding: 4rem 2rem;
  margin: 0 -1.5rem 3rem;
  position: relative;
  overflow: hidden;
}

.hero-section::after {
  content: '';
  position: absolute;
  bottom: -50px;
  right: -50px;
  width: 300px;
  height: 300px;
  background-color: rgba(199, 210, 254, 0.1);
  border-radius: 50%;
}

.hero-section h1,
.hero-section h2,
.hero-section p {
  color: var(--color-bg);
  position: relative;
  z-index: 1;
}

.offset-box {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 2rem;
  border-radius: var(--radius);
  position: relative;
  margin: 2rem 0;
}

.offset-box::before {
  content: '';
  position: absolute;
  top: 15px;
  left: 15px;
  right: -15px;
  bottom: -15px;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius);
  z-index: -1;
}

.feature-grid {
  display: grid;
  gap: 3rem;
  margin: 3rem 0;
}

.feature-item {
  padding: 2rem;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-primary);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.feature-item:hover {
  transform: translateX(10px);
  box-shadow: -8px 8px 20px rgba(49, 46, 129, 0.1);
  border-color: var(--color-secondary);
}

@media (min-width: 768px) {
  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2.25rem;
  }

  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-asymmetric {
    grid-template-columns: 1.5fr 1fr;
  }

  .grid-asymmetric > *:nth-child(even) {
    grid-column: 1;
    grid-row: 2;
  }

  .grid-asymmetric > *:nth-child(odd) {
    grid-column: 2;
    grid-row: 1;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-footer .container {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-section {
    padding: 6rem 2rem;
  }
}

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

  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-asymmetric {
    grid-template-columns: 2fr 1fr;
  }

  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .site-header .container {
    padding: 1.25rem 2rem;
  }

  .container {
    padding: 0 2rem;
  }
}

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

  .card:hover {
    transform: none;
  }

  .feature-item:hover {
    transform: none;
  }

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

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

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

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

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

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

  .hero-section {
    background: none;
    color: #000;
    padding: 1rem 0;
    margin: 0;
  }

  .hero-section h1,
  .hero-section h2,
  .hero-section p {
    color: #000;
  }
}