:root {
  --bg: #f4efe6;
  --paper: rgba(255, 250, 240, 0.76);
  --panel: rgba(255, 255, 255, 0.72);
  --line: rgba(66, 47, 32, 0.12);
  --ink: #20150f;
  --muted: #665347;
  --accent: #0f7c73;
  --accent-2: #ef8450;
  --accent-3: #c93f32;
  --shadow: 0 24px 80px rgba(51, 27, 10, 0.12);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --mono: "IBM Plex Mono", monospace;
  --sans: "Space Grotesk", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(15, 124, 115, 0.16), transparent 28%),
    radial-gradient(circle at 85% 12%, rgba(239, 132, 80, 0.16), transparent 22%),
    linear-gradient(180deg, #f8f1e4 0%, #f1eadf 44%, #efe7dc 100%);
}

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

.page-shell {
  min-height: 100vh;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 24px 24px 40px;
}

.hero__mesh {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(15, 124, 115, 0.12), transparent 35%),
    linear-gradient(315deg, rgba(201, 63, 50, 0.08), transparent 42%),
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.5), transparent 40%);
  pointer-events: none;
}

.topbar,
.hero__content,
.layout {
  position: relative;
  z-index: 1;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto 28px;
  padding: 14px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 251, 245, 0.72);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

.brand__mark {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), #115d5b);
  color: #fff8ee;
  font-size: 0.9rem;
}

.brand__text {
  letter-spacing: 0.04em;
}

.topbar__links {
  display: flex;
  gap: 22px;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero__content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 44px 12px 0;
}

.eyebrow {
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid rgba(15, 124, 115, 0.18);
  border-radius: 999px;
  background: rgba(15, 124, 115, 0.08);
  color: #0b5f5b;
  font-family: var(--mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.05;
}

h1 {
  max-width: 900px;
  margin-top: 18px;
  font-size: clamp(3rem, 6vw, 6.2rem);
  letter-spacing: -0.05em;
}

.hero__lead {
  max-width: 720px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.18rem;
  line-height: 1.65;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
}

.button--primary {
  background: linear-gradient(135deg, var(--accent), #115d5b);
  color: white;
  box-shadow: 0 16px 32px rgba(15, 124, 115, 0.24);
}

.button--secondary {
  background: rgba(255, 250, 240, 0.88);
  border-color: var(--line);
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 42px;
}

.hero__stats article,
.card,
.sidebar__card,
.thread-diagram__center,
.thread-diagram__side,
.flow__node,
.tabs,
.timeline__body {
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.hero__stats article {
  padding: 20px;
  border-radius: var(--radius-lg);
}

.hero__stats span {
  display: block;
  font-size: 2rem;
  font-weight: 700;
}

.hero__stats p {
  margin: 8px 0 0;
  color: var(--muted);
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 28px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px 64px;
}

.sidebar {
  position: sticky;
  top: 18px;
  align-self: start;
  display: grid;
  gap: 16px;
}

.sidebar__card {
  display: grid;
  gap: 10px;
  padding: 18px;
  border-radius: var(--radius-lg);
}

.sidebar__card--muted {
  background: rgba(30, 21, 15, 0.04);
}

.sidebar__label {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.sidebar__card a {
  color: var(--ink);
  font-weight: 500;
}

.sidebar__card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.content {
  display: grid;
  gap: 28px;
}

.section {
  padding: 30px;
  border-radius: calc(var(--radius-xl) + 4px);
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.section__header {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: 18px;
  margin-bottom: 24px;
}

.section__index {
  display: inline-grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 20px;
  background: #20150f;
  color: #fff7ea;
  font-family: var(--mono);
  font-size: 1rem;
}

.section__header h2 {
  font-size: clamp(2rem, 3vw, 3rem);
  letter-spacing: -0.04em;
}

.section__header p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.7;
  max-width: 880px;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  padding: 22px;
  border-radius: var(--radius-lg);
}

.card--accent {
  background: linear-gradient(180deg, rgba(15, 124, 115, 0.12), rgba(255, 255, 255, 0.76));
}

.card h3,
.timeline__body h3,
.thread-diagram h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.card p,
.card li,
.timeline__body p,
.thread-diagram p,
.thread-diagram h4,
.checklist p {
  color: var(--muted);
  line-height: 1.65;
}

.card ul {
  margin: 0;
  padding-left: 18px;
}

.memory-stack {
  display: grid;
  gap: 18px;
}

.memory {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.memory h3 {
  margin-bottom: 8px;
}

.memory p {
  margin: 0;
  color: var(--muted);
}

.memory--project {
  background: linear-gradient(135deg, rgba(15, 124, 115, 0.18), rgba(255, 255, 255, 0.74));
}

.memory--tooling {
  background: linear-gradient(135deg, rgba(239, 132, 80, 0.2), rgba(255, 255, 255, 0.78));
}

.memory--flash {
  background: linear-gradient(135deg, rgba(32, 21, 15, 0.08), rgba(255, 255, 255, 0.82));
}

.memory--thread {
  background: linear-gradient(135deg, rgba(201, 63, 50, 0.18), rgba(255, 255, 255, 0.8));
}

.timeline {
  display: grid;
  gap: 14px;
}

.timeline__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  align-items: stretch;
}

.timeline__step {
  display: inline-grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 18px;
  background: linear-gradient(135deg, #20150f, #3c271d);
  color: white;
  font-family: var(--mono);
}

.timeline__body {
  padding: 18px 20px;
  border-radius: var(--radius-lg);
}

.flow {
  display: grid;
  gap: 14px;
  margin-bottom: 18px;
}

.flow__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 40px minmax(0, 1fr) 40px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
}

.flow__node {
  display: grid;
  place-items: center;
  min-height: 92px;
  padding: 18px;
  border-radius: var(--radius-lg);
  font-weight: 700;
  text-align: center;
}

.flow__arrow {
  text-align: center;
  font-size: 1.6rem;
  color: var(--muted);
}

.thread-diagram {
  display: grid;
  grid-template-columns: 1.25fr 1fr 1fr;
  gap: 18px;
  align-items: stretch;
}

.thread-diagram__center,
.thread-diagram__side {
  padding: 22px;
  border-radius: var(--radius-lg);
}

.thread-diagram__center {
  grid-row: span 2;
  background: linear-gradient(160deg, rgba(15, 124, 115, 0.16), rgba(255, 255, 255, 0.86));
}

.tabs {
  padding: 16px;
  border-radius: var(--radius-lg);
}

.tabs__nav {
  display: inline-flex;
  gap: 8px;
  padding: 6px;
  border-radius: 999px;
  background: rgba(32, 21, 15, 0.06);
}

.tabs__button {
  border: 0;
  background: transparent;
  padding: 10px 16px;
  border-radius: 999px;
  font-family: var(--sans);
  font-weight: 700;
  cursor: pointer;
}

.tabs__button.is-active {
  background: #20150f;
  color: #fff7ea;
}

.tabs__panel {
  display: none;
  margin-top: 16px;
}

.tabs__panel.is-active {
  display: block;
}

.codeblock {
  overflow-x: auto;
  padding: 18px;
  border-radius: var(--radius-md);
  background: #1e1612;
  color: #f7efdf;
  font-family: var(--mono);
  line-height: 1.9;
}

.checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.checklist article {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
}

.checklist span {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: rgba(15, 124, 115, 0.12);
  color: #0b5f5b;
  font-family: var(--mono);
  font-weight: 700;
}

.checklist p {
  margin: 0;
}

@media (max-width: 1100px) {
  .layout,
  .grid--3,
  .grid--2,
  .thread-diagram,
  .checklist {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 820px) {
  .topbar {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    border-radius: 24px;
  }

  .topbar__links {
    flex-wrap: wrap;
    gap: 12px 16px;
  }

  .hero__stats,
  .flow__row,
  .section__header {
    grid-template-columns: 1fr;
  }

  .section__index {
    width: 54px;
    height: 54px;
  }
}