:root {
  --color-primary: #6F5BFF;
  --color-secondary: #1FD1B6;
  --color-accent: #FFB84D;
  --color-background: #0B1020;
  --color-surface: #121A33;
  --color-text: #EAF0FF;
  --color-text-muted: #B7C2E6;
  --color-border: #2A3563;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 100%;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.2;
  margin-bottom: 1rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  line-height: 1.3;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 600;
  color: var(--color-text);
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.5rem;
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  line-height: 1.4;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
  color: var(--color-secondary);
}

p {
  margin-bottom: 1rem;
  font-size: clamp(1rem, 2vw, 1.125rem);
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color 0.2s ease, text-decoration 0.2s ease;
}

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

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

header {
  background: linear-gradient(180deg, var(--color-surface) 0%, rgba(18, 26, 51, 0.95) 100%);
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 1rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .header-container {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

header .site-name {
  font-size: clamp(1.5rem, 4vw, 1.875rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  align-items: center;
}

header nav a {
  color: var(--color-text);
  font-weight: 500;
  font-size: clamp(0.9375rem, 2vw, 1.0625rem);
  padding: 0.5rem 0.75rem;
  border-radius: calc(var(--radius) / 2);
  transition: background-color 0.2s ease, color 0.2s ease;
}

header nav a:hover {
  background-color: rgba(111, 91, 255, 0.15);
  color: var(--color-primary);
  text-decoration: none;
}

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

nav[aria-label="Breadcrumb"] {
  max-width: var(--max);
  margin: 1rem auto 0;
  padding: 0 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-size: clamp(0.875rem, 2vw, 0.9375rem);
  color: var(--color-text-muted);
}

nav[aria-label="Breadcrumb"] a {
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

nav[aria-label="Breadcrumb"] a:hover {
  color: var(--color-secondary);
  text-decoration: none;
}

nav[aria-label="Breadcrumb"] span {
  color: var(--color-text-muted);
}

main {
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1rem;
}

section {
  margin-bottom: 3rem;
}

article {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
}

aside {
  background: linear-gradient(135deg, rgba(111, 91, 255, 0.1), rgba(31, 209, 182, 0.1));
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 1.5rem 0;
  box-shadow: 0 4px 12px rgba(111, 91, 255, 0.15);
}

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

blockquote {
  background-color: var(--color-surface);
  border-left: 5px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--color-text-muted);
  box-shadow: 0 0 20px rgba(255, 184, 77, 0.1);
  position: relative;
}

blockquote::before {
  content: '"';
  font-size: 3rem;
  color: var(--color-accent);
  opacity: 0.3;
  position: absolute;
  top: -0.5rem;
  left: 0.75rem;
  font-family: Georgia, serif;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 1.5rem 0;
  box-shadow: var(--shadow);
  font-size: clamp(0.875rem, 2vw, 1rem);
}

caption {
  caption-side: top;
  padding: 1rem;
  font-weight: 600;
  font-size: clamp(1.125rem, 2.5vw, 1.25rem);
  text-align: left;
  background: linear-gradient(135deg, rgba(111, 91, 255, 0.2), rgba(31, 209, 182, 0.2));
  color: var(--color-text);
  border-bottom: 2px solid var(--color-border);
}

thead {
  background: linear-gradient(180deg, var(--color-primary), rgba(111, 91, 255, 0.8));
  color: var(--color-text);
}

th {
  padding: 1rem 0.75rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
}

td {
  padding: 0.875rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

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

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

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

tbody tr:hover {
  background-color: rgba(111, 91, 255, 0.1);
}

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

details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  transition: box-shadow 0.3s ease;
}

details:hover {
  box-shadow: 0 6px 18px rgba(111, 91, 255, 0.25);
}

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

summary {
  cursor: pointer;
  font-weight: 600;
  font-size: clamp(1.0625rem, 2.5vw, 1.1875rem);
  color: var(--color-secondary);
  padding: 0.5rem;
  margin: -0.5rem;
  border-radius: calc(var(--radius) / 2);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

summary::before {
  content: '▶';
  display: inline-block;
  transition: transform 0.3s ease;
  color: var(--color-accent);
  font-size: 0.875rem;
}

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

summary:hover {
  background-color: rgba(31, 209, 182, 0.1);
  color: var(--color-accent);
}

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

details .answer {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

ul, ol {
  margin: 1rem 0 1rem 1.5rem;
}

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

footer {
  background: linear-gradient(180deg, rgba(18, 26, 51, 0.95) 0%, var(--color-surface) 100%);
  border-top: 1px solid var(--color-border);
  padding: 2rem 1rem;
  margin-top: 3rem;
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.25);
}

footer .footer-container {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
  text-align: center;
}

footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}

footer nav a {
  color: var(--color-text-muted);
  font-size: clamp(0.9375rem, 2vw, 1rem);
  transition: color 0.2s ease;
}

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

footer p {
  color: var(--color-text-muted);
  font-size: clamp(0.875rem, 2vw, 0.9375rem);
  margin: 0;
}

@media (min-width: 768px) {
  header .header-container {
    flex-direction: row;
    justify-content: space-between;
  }

  header nav {
    justify-content: flex-end;
  }

  article {
    padding: 2rem;
  }

  table {
    font-size: 1rem;
  }

  thead {
    position: sticky;
    top: 0;
    z-index: 10;
  }

  th {
    padding: 1.125rem 1rem;
  }

  td {
    padding: 1rem;
  }

  footer .footer-container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  footer nav {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  main {
    padding: 3rem 2rem;
  }

  section {
    margin-bottom: 4rem;
  }

  h2 {
    margin-top: 3rem;
  }
}

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

  html {
    scroll-behavior: auto;
  }

  summary::before {
    transition: none;
  }
}

@media print {
  body {
    background-color: white;
    color: black;
  }

  header, footer, nav[aria-label="Breadcrumb"], aside {
    display: none;
  }

  main {
    max-width: 100%;
    padding: 0;
  }

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

  article, table, blockquote, details {
    box-shadow: none;
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }

  h1, h2, h3 {
    color: black;
    page-break-after: avoid;
  }

  details {
    border: 1px solid #ccc;
  }

  summary::before {
    content: '';
  }

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