:root {
  --bg: #f7f4ee;
  --text: #191713;
  --muted: #6a645b;
  --line: rgba(25, 23, 19, 0.2);
  --line-soft: rgba(25, 23, 19, 0.1);
  --accent: #4d5944;
  --sidebar-width: 220px;
  --content-width: 860px;
  --serif: "Palatino Linotype", "Book Antiqua", "Iowan Old Style", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

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

h1,
h2,
p {
  margin: 0;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  gap: 52px;
  width: min(calc(100% - 80px), 1120px);
  margin: 0 auto;
  padding: 72px 0 96px;
}

.sidebar {
  padding-top: 18px;
  position: sticky;
  top: 40px;
  align-self: start;
}

.sidebar-block {
  display: grid;
  gap: 14px;
}

.sidebar-block + .sidebar-block {
  margin-top: 30px;
}

.brand {
  font-size: 1.35rem;
  line-height: 1.15;
}

.brand-note {
  max-width: 170px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.55;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.sidebar-nav,
.sidebar-links {
  position: relative;
}

.sidebar-nav::before,
.sidebar-links::before {
  content: "";
  display: block;
  width: 136px;
  height: 1px;
  margin-bottom: 18px;
  background: var(--line);
}

.sidebar-nav a,
.sidebar-links a {
  display: block;
  width: fit-content;
  color: var(--muted);
  font-size: 1rem;
  padding: 2px 0;
}

.content {
  max-width: var(--content-width);
}

.hero-kicker {
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 14ch;
  font-size: clamp(2.9rem, 4.2vw, 4rem);
  line-height: 0.98;
  font-weight: 400;
  letter-spacing: -0.04em;
}

.hero-rule {
  width: 100%;
  height: 1px;
  margin: 26px 0 30px;
  background: var(--text);
}

.hero-copy {
  max-width: 680px;
}

.intro-line {
  margin-top: 16px;
  font-size: 0.98rem;
}

.intro-line:first-of-type {
  margin-top: 0;
}

.intro-line-muted {
  color: var(--muted);
  font-style: italic;
}

.content-section {
  margin-top: 76px;
}

.section-heading {
  margin-bottom: 20px;
}

.section-heading h2 {
  font-size: 1rem;
  font-weight: 400;
  color: var(--muted);
}

.list {
  display: grid;
  gap: 22px;
}

.list-item {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 18px;
}

.list-index {
  color: var(--muted);
  font-size: 0.96rem;
  transform: translateY(2px);
}

.item-title {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 1.08rem;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.item-title-static {
  text-decoration: none;
}

.list-item p {
  color: var(--muted);
  font-size: 0.98rem;
}

.accordion {
  border-top: 1px solid var(--line-soft);
}

.accordion-item {
  border-bottom: 1px solid var(--line-soft);
}

.accordion-item summary {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}

.accordion-item summary::-webkit-details-marker {
  display: none;
}

.accordion-title {
  position: relative;
  padding-left: 22px;
  font-size: 1.08rem;
}

.accordion-title::before {
  content: "+";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--muted);
}

.accordion-item[open] .accordion-title::before {
  content: "−";
}

.accordion-meta {
  color: var(--muted);
  font-size: 0.95rem;
  white-space: nowrap;
}

.accordion-body {
  max-width: 820px;
  padding: 0 0 18px 22px;
}

.accordion-body p {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.98rem;
}

.accordion-body p:first-child {
  margin-top: 0;
  color: var(--text);
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 40px;
    width: min(calc(100% - 40px), 920px);
    padding: 36px 0 64px;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 720px) {
  .layout {
    width: min(calc(100% - 28px), 920px);
  }

  .hero h1 {
    max-width: 10ch;
    font-size: clamp(2.5rem, 10vw, 3.4rem);
  }

  .accordion-item summary {
    flex-direction: column;
    gap: 8px;
  }

  .accordion-meta {
    white-space: normal;
  }

  .list-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}