:root {
  color-scheme: dark;
  --bg: #101018;
  --bg-elevated: #181828;
  --text: #f4f4f8;
  --muted: #9ea1b3;
  --accent: #ff4d94;
  --accent-soft: rgba(255, 77, 148, 0.18);
  --structure-blue: #4da3ff;
  --border: #27293d;
  --code-bg: #1b1b2b;
  --code-border: #2d2d44;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
}

.app {
  display: flex;
  width: 100%;
}

.sidebar {
  width: 320px;
  background: linear-gradient(180deg, #151523 0%, #101018 100%);
  border-right: 1px solid var(--border);
  padding: 2.5rem 1.5rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar__header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
}

.sidebar__logo {
  display: block;
  width: 72px;
  height: 72px;
  border-radius: 1.2rem;
  box-shadow: 0 15px 30px rgba(255, 77, 148, 0.35);
  background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.15), transparent 60%),
    rgba(255, 77, 148, 0.18);
  padding: 0.75rem;
}

.sidebar__header h1 {
  font-size: 1.6rem;
  margin: 0;
}

.sidebar__tagline {
  color: var(--muted);
  margin: 0.35rem 0 2rem;
}

.sidebar__nav {
  display: grid;
  gap: 0.5rem;
}

.nav-group {
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid transparent;
  overflow: hidden;
}

.nav-group__title {
  margin: 0;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.02);
}

.nav-item {
  display: block;
  padding: 0.65rem 1rem;
  text-decoration: none;
  color: var(--text);
  font-size: 0.98rem;
  border-left: 3px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.04);
}

.nav-item--active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.content {
  flex: 1;
  padding: 3rem;
  display: grid;
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.content__header {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.content__breadcrumbs {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0;
}

.content__title {
  font-size: 2.2rem;
  margin: 0;
}

.card {
  background: var(--bg-elevated);
  border-radius: 1rem;
  border: 1px solid var(--border);
  padding: 1.75rem;
  box-shadow: 0 30px 60px rgba(12, 12, 20, 0.45);
}

.card h3 {
  margin-top: 0;
  font-size: 1.4rem;
}

.card p {
  line-height: 1.6;
  color: var(--muted);
}

.card ul {
  padding-left: 1.4rem;
  color: var(--muted);
  line-height: 1.6;
}

.pattern-overview {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.pattern-meta {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  align-items: start;
}

.pattern-meta__section {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--code-border);
  border-radius: 0.75rem;
  padding: 1.15rem 1.25rem;
  display: grid;
  gap: 0.75rem;
}

.pattern-meta__section h4 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text);
}

.pattern-meta__list {
  margin: 0;
  padding-left: 1.4rem;
  color: var(--muted);
  line-height: 1.6;
}

.pattern-diagram {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--code-border);
  border-radius: 0.75rem;
  padding: 1rem 1.25rem;
  display: grid;
  gap: 0.75rem;
  justify-self: stretch;
}

.pattern-diagram h4 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text);
}

.pattern-diagram pre {
  margin: 0;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.95rem;
  white-space: pre;
  overflow-x: auto;
  color: var(--muted);
}

@media (min-width: 1200px) {
  .pattern-diagram pre {
    font-size: 1rem;
  }
}

.pattern-meta__usage {
  margin: 0;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.benefits-grid h4 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
  color: var(--text);
}

.tabs {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.tab-list {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.tab-button {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: border 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.tab-button:hover {
  color: var(--text);
  border-color: var(--accent);
}

.tab-button--active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

.tab-button--structure {
  color: var(--structure-blue);
  border-color: rgba(77, 163, 255, 0.4);
  background: rgba(77, 163, 255, 0.08);
}

.tab-button--structure:hover {
  color: var(--structure-blue);
  border-color: var(--structure-blue);
  background: rgba(77, 163, 255, 0.16);
}

.tab-button--structure.tab-button--active {
  background: rgba(77, 163, 255, 0.24);
  border-color: var(--structure-blue);
  color: var(--structure-blue);
}

.tab-panel {
  display: none;
}

.tab-panel--active {
  display: block;
}

.code-card {
  background: var(--code-bg);
  border-radius: 0.8rem;
  border: 1px solid var(--code-border);
  padding: 1.2rem 1.2rem 1.4rem;
  position: relative;
}

.code-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
}

.code-card__title {
  margin: 0;
  font-size: 1rem;
  color: var(--text);
}

.code-card__title--structure {
  color: var(--structure-blue);
}

.structure-heading {
  color: var(--structure-blue);
}

.copy-button {
  border: none;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  padding: 0.35rem 0.75rem;
  border-radius: 0.6rem;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.2s ease, color 0.2s ease;
}

.copy-button:hover {
  background: var(--accent);
  color: #fff;
}

pre {
  margin: 0;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 0.9rem;
  color: var(--text);
  font-family: "Fira Code", "Source Code Pro", monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  padding: 1.25rem;
  overflow-x: auto;
  overflow-y: visible;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.02);
}

code {
  white-space: pre;
  display: block;
}

.token {
  font-family: inherit;
}

.token-keyword {
  color: #c678dd;
}

.token-type {
  color: #e5c07b;
}

.token-string {
  color: #98c379;
}

.token-number {
  color: #d19a66;
}

.token-literal {
  color: #56b6c2;
}

.token-comment {
  color: #5c6370;
  font-style: italic;
}

.token-decorator {
  color: #61afef;
}

.token-class {
  color: #e06c75;
}

@media (max-width: 1100px) {
  .sidebar {
    display: none;
  }

  .content {
    padding: 2rem;
  }
}

@media (max-width: 720px) {
  .content {
    padding: 1.5rem;
    gap: 1.5rem;
  }

  .card {
    padding: 1.25rem;
  }
}