:root {
  --bg: #171311;
  --bg-elevated: rgba(34, 27, 23, 0.78);
  --bg-soft: rgba(255, 255, 255, 0.04);
  --surface-border: rgba(255, 233, 214, 0.11);
  --text: #f8f2ea;
  --text-muted: rgba(248, 242, 234, 0.75);
  --text-dim: rgba(248, 242, 234, 0.58);
  --accent: #e6a26f;
  --accent-strong: #ffc48f;
  --accent-soft: rgba(230, 162, 111, 0.18);
  --shadow: 0 32px 90px rgba(0, 0, 0, 0.28);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 999px;
  --content-width: 1120px;
  --space-1: 0.5rem;
  --space-2: 0.875rem;
  --space-3: 1.25rem;
  --space-4: 1.75rem;
  --space-5: 2.5rem;
  --space-6: 3.5rem;
  --space-7: 5rem;
  --display-font: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --body-font: "Segoe UI", "Aptos", "Trebuchet MS", sans-serif;
  --mono-font: "Cascadia Code", "Consolas", "SFMono-Regular", monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--body-font);
  background:
    linear-gradient(180deg, #120f0d 0%, #171311 44%, #120f0f 100%);
  line-height: 1.6;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 120px 120px;
  mask-image: radial-gradient(circle at center, black 30%, transparent 85%);
  opacity: 0.35;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 16% 14%, rgba(255, 183, 120, 0.2), transparent 20rem),
    radial-gradient(circle at 78% 22%, rgba(222, 122, 77, 0.18), transparent 24rem),
    radial-gradient(circle at 70% 72%, rgba(255, 212, 180, 0.08), transparent 18rem);
  z-index: 0;
}

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

img {
  display: block;
  max-width: 100%;
}

code {
  font-family: var(--mono-font);
}

.skip-link,
.copy-button,
.top-nav a {
  transition:
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    transform 180ms ease,
    box-shadow 180ms ease;
}

.skip-link {
  position: absolute;
  top: 1rem;
  left: 1rem;
  z-index: 20;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  background: #fff6ef;
  color: #211814;
  transform: translateY(-220%);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.page-shell {
  width: min(calc(100% - 2rem), var(--content-width));
  margin: 0 auto;
  padding-bottom: var(--space-7);
}

.site-header {
  position: static;
  z-index: 10;
  padding-top: 1rem;
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--surface-border);
  border-radius: calc(var(--radius-lg) - 6px);
  background: rgba(14, 10, 9, 0.97);
  backdrop-filter: blur(18px);
  box-shadow: 0 18px 64px rgba(0, 0, 0, 0.28);
}

.brand-mark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.25rem;
  font-family: var(--display-font);
  letter-spacing: 0.03em;
}

.brand-mark__glyph {
  padding: 0.25rem 0.55rem;
  border: 1px solid rgba(255, 232, 215, 0.16);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.8rem;
}

.brand-mark__name {
  font-size: 1.05rem;
  color: var(--text-muted);
}

.top-nav__links {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  justify-content: center;
}

.top-nav__links a,
.github-link {
  padding: 0.55rem 0.8rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

.top-nav__links a:hover,
.top-nav__links a:focus-visible {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.github-link {
  border: 1px solid rgba(255, 213, 182, 0.2);
  background:
    linear-gradient(135deg, rgba(255, 202, 154, 0.16), rgba(255, 255, 255, 0.02));
}

.github-link:hover,
.github-link:focus-visible {
  color: #1e1511;
  background: linear-gradient(135deg, #ffddb9, #f2a974);
}

.hero,
.initialize,
.content-section {
  position: relative;
  overflow: clip;
  border: 1px solid var(--surface-border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.02));
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.95fr);
  gap: var(--space-5);
  margin-top: 1.4rem;
  padding: clamp(2rem, 3vw, 3rem);
  border-radius: var(--radius-lg);
}

.hero__content,
.hero__panel,
.initialize__grid,
.value-grid,
.what-you-get__intro,
.what-you-get__note,
.why-prose,
.workflow-copy,
.reading-copy {
  position: relative;
  z-index: 1;
}

.eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--accent-strong);
  font-size: 0.8rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

h1,
h2,
h3,
.workflow-item__phase {
  margin: 0;
  font-weight: 500;
  font-family: var(--display-font);
  line-height: 1.05;
}

h1 {
  max-width: 12ch;
  font-size: clamp(2.8rem, 5.45vw, 5.2rem);
  letter-spacing: -0.04em;
}

.hero h1 {
  max-width: min(28ch, 100%);
}

h2 {
  max-width: min(26ch, 100%);
  font-size: clamp(2rem, 3vw, 3.1rem);
  letter-spacing: -0.03em;
}

h3 {
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}

.hero__lede,
.command-card__hint,
.initialize p,
.value-card p,
.what-you-get__intro,
.why-prose p,
.workflow-copy > p,
.workflow-item p,
.reading-copy p,
.top-nav__links a,
.github-link {
  font-size: 1rem;
}

.hero__lede {
  max-width: 62ch;
  margin: var(--space-4) 0 0;
  color: var(--text-muted);
}

.hero__support {
  margin-top: var(--space-2);
}

.command-card {
  margin-top: var(--space-5);
  padding: 1.1rem;
  border: 1px solid rgba(255, 215, 186, 0.18);
  border-radius: calc(var(--radius-lg) - 8px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03)),
    rgba(22, 16, 14, 0.85);
}

.command-card__label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 0.7rem;
}

.command-card__label p {
  margin: 0;
}

.command-card__requirement {
  color: var(--text-dim);
  font-size: 0.84rem;
  white-space: nowrap;
  text-align: right;
}

.command-card__label > :first-child {
  color: var(--text-dim);
  font-size: 0.92rem;
}

.command-card__chooser,
.more-targets__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.command-card__chooser {
  margin-bottom: 1rem;
}

.install-option,
.more-targets summary {
  border: 1px solid rgba(255, 226, 203, 0.14);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  font: inherit;
  line-height: 1.2;
}

.install-option {
  appearance: none;
  min-height: 2.35rem;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  transition:
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    transform 180ms ease,
    box-shadow 180ms ease;
}

.install-option:hover,
.install-option:focus-visible,
.more-targets summary:hover,
.more-targets summary:focus-visible {
  color: var(--text);
  background: rgba(255, 194, 144, 0.1);
  border-color: rgba(255, 210, 173, 0.24);
}

.install-option.is-selected {
  color: #1f1510;
  border-color: rgba(255, 220, 194, 0.5);
  background: linear-gradient(135deg, #ffd8b7, #e9a673);
  box-shadow: 0 10px 28px rgba(230, 162, 111, 0.16);
}

.install-option--subtle {
  color: var(--text-dim);
}

.more-targets {
  position: relative;
  min-height: 2.45rem;
  margin-bottom: 1rem;
}

.more-targets summary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 2.45rem;
  padding: 0.5rem 0.9rem;
  list-style: none;
  cursor: pointer;
}

.more-targets summary::-webkit-details-marker {
  display: none;
}

.more-targets summary::after {
  content: "+";
  font-size: 0.95rem;
}

.more-targets[open] summary::after {
  content: "-";
}

.more-targets[open] summary {
  visibility: hidden;
  pointer-events: none;
}

.more-targets__grid {
  margin-top: 0.75rem;
}

.more-targets[open] .more-targets__grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  margin-top: 0;
}

.command-card__row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.command-card__code {
  flex: 1;
  min-width: 0;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(255, 223, 199, 0.12);
  border-radius: var(--radius-md);
  background: rgba(8, 6, 5, 0.42);
  color: #fffaf5;
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  white-space: nowrap;
  overflow-x: auto;
  cursor: text;
}

.copy-button {
  flex: 0 0 auto;
  min-width: 6.25rem;
  padding: 0.8rem 1rem;
  border: 1px solid rgba(255, 226, 203, 0.15);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font: inherit;
  cursor: pointer;
}

.copy-button:hover,
.copy-button:focus-visible {
  transform: translateY(-1px);
  background: rgba(255, 194, 144, 0.15);
  box-shadow: 0 0 0 4px rgba(255, 185, 127, 0.12);
}

.command-card__guidance {
  margin: 0.85rem 0 0;
  color: var(--text-muted);
  font-size: 0.94rem;
}

.command-card__hint {
  margin: 0.4rem 0 0;
  color: var(--text-dim);
}

.hero__panel {
  align-self: end;
  padding: 1.3rem;
  border: 1px solid rgba(255, 223, 199, 0.14);
  border-radius: calc(var(--radius-lg) - 10px);
  background: rgba(255, 250, 246, 0.04);
}

.hero__panel-label {
  margin: 0 0 1rem;
  color: var(--accent-strong);
  font-size: 0.84rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero__notes {
  display: grid;
  gap: 0.95rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero__notes li {
  padding-top: 0.95rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

.hero__notes li:first-child {
  padding-top: 0;
  border-top: 0;
}

.initialize,
.content-section {
  margin-top: var(--space-4);
  padding: clamp(1.6rem, 2.4vw, 2.4rem);
  border-radius: calc(var(--radius-lg) - 4px);
}

.section-heading {
  display: grid;
  gap: 0.75rem;
}

.section-heading h2 code {
  color: var(--accent-strong);
  font-size: 0.9em;
}

.initialize__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.9fr);
  gap: var(--space-4);
  margin-top: var(--space-4);
  align-items: start;
}

.initialize__copy {
  display: grid;
  gap: 1rem;
}

.initialize__card {
  padding: 1.1rem 1.4rem;
  border: 1px solid rgba(255, 233, 214, 0.12);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
}

.initialize__card-label {
  margin: 0 0 0.85rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

.initialize__card-label code {
  color: var(--accent-strong);
  font-size: 0.94em;
}

.initialize__steps {
  counter-reset: initialize-step;
  margin: 0;
  padding: 0;
  list-style: none;
}

.initialize__steps li {
  display: grid;
  grid-template-columns: 1.15rem minmax(0, 1fr);
  align-items: baseline;
  column-gap: 0.9rem;
  color: var(--text-muted);
  min-width: 0;
}

.initialize__steps li::before {
  counter-increment: initialize-step;
  content: counter(initialize-step) ".";
  flex: 0 0 1.15rem;
  color: var(--accent-strong);
  font-family: var(--mono-font);
  font-size: 0.95rem;
}

.initialize__step-copy {
  min-width: 0;
}

.initialize__steps li + li {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.initialize__steps code {
  color: var(--accent-strong);
  font-size: 0.94em;
  white-space: normal;
  overflow-wrap: anywhere;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.value-card {
  padding: 1.35rem;
  border: 1px solid rgba(255, 233, 214, 0.12);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
}

.value-card p {
  margin: 0.85rem 0 0;
  color: var(--text-muted);
}

.workflow-copy {
  margin-top: var(--space-4);
}

.workflow-copy > p {
  max-width: 60ch;
  margin: 0 0 var(--space-4);
  color: var(--text-muted);
}

.workflow-list {
  --workflow-arrow: rgba(230, 162, 111, 0.5);
  --workflow-arrow-size: 0.45rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.workflow-item {
  position: relative;
  margin: 0;
  padding: 1.1rem 1.2rem;
  border: 1px solid rgba(255, 233, 214, 0.12);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
}

.workflow-item:not(:last-child)::after {
  content: "";
  position: absolute;
  pointer-events: none;
  z-index: 1;
  width: var(--workflow-arrow-size);
  height: var(--workflow-arrow-size);
  border-right: 1.5px solid var(--workflow-arrow);
  border-bottom: 1.5px solid var(--workflow-arrow);
  left: 50%;
  bottom: calc(-0.85rem - var(--workflow-arrow-size) * 0.35);
  transform: translateX(-50%) rotate(45deg);
}

.workflow-item__phase {
  display: inline-block;
  margin-bottom: 0.45rem;
  color: var(--accent-strong);
  font-size: 1.15rem;
}

.workflow-item p {
  margin: 0;
  color: var(--text-muted);
}

@media (min-width: 640px) and (max-width: 959px) {
  .workflow-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 1.5rem;
    row-gap: 1.75rem;
  }

  .workflow-item:not(:last-child)::after {
    border-right: 1.5px solid var(--workflow-arrow);
    border-bottom: 1.5px solid var(--workflow-arrow);
  }

  .workflow-item:nth-child(1)::after,
  .workflow-item:nth-child(3)::after {
    left: auto;
    right: calc(-0.85rem - var(--workflow-arrow-size) * 0.35);
    bottom: auto;
    top: 50%;
    transform: translate(50%, -50%) rotate(-45deg);
  }

  .workflow-item:nth-child(2)::after {
    left: 50%;
    right: auto;
    top: auto;
    bottom: calc(-1rem - var(--workflow-arrow-size) * 0.35);
    transform: translateX(-50%) rotate(45deg);
  }
}

@media (min-width: 960px) {
  .workflow-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 1.35rem;
    row-gap: 0;
  }

  .workflow-item:not(:last-child)::after {
    left: auto;
    right: calc(-0.75rem - var(--workflow-arrow-size) * 0.35);
    bottom: auto;
    top: 50%;
    transform: translate(50%, -50%) rotate(-45deg);
  }
}

.reading-copy {
  display: grid;
  gap: 1rem;
  max-width: 78ch;
  margin-top: var(--space-4);
}

.reading-copy p {
  margin: 0;
  color: var(--text-muted);
}

.what-you-get__intro {
  max-width: 72ch;
  margin: var(--space-4) 0 0;
  color: var(--text-muted);
}

.what-you-get__note {
  max-width: none;
  margin: var(--space-3) 0 0;
  color: var(--text-dim);
  font-size: 0.92rem;
  line-height: 1.55;
}

.what-you-get__note strong {
  color: var(--text-muted);
}

.why-prose {
  display: grid;
  gap: 1.15rem;
  max-width: 72ch;
  margin-top: var(--space-4);
}

.why-prose p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.65;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid rgba(255, 205, 168, 0.9);
  outline-offset: 3px;
}

@media (max-width: 960px) {
  .site-header {
    padding-top: 0.75rem;
  }

  .hero,
  .initialize__grid {
    grid-template-columns: 1fr;
  }

  .top-nav__links {
    display: none;
  }

  .hero__panel {
    align-self: stretch;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 1rem), var(--content-width));
  }

  .hero,
  .initialize,
  .content-section {
    padding: 1.2rem;
  }

  h1 {
    max-width: 11ch;
  }

  .command-card__row,
  .value-grid {
    grid-template-columns: 1fr;
  }

  .command-card__row {
    display: grid;
  }

  .command-card__chooser,
  .more-targets__grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .more-targets[open] {
    min-height: 0;
    margin-bottom: 0;
  }

  .more-targets[open] summary {
    display: none;
  }

  .more-targets[open] .more-targets__grid {
    position: static;
    margin-top: 0;
  }

  .copy-button {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .command-card__chooser,
  .more-targets__grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .hero,
  .initialize,
  .content-section {
    animation: rise-in 700ms ease both;
  }

  .initialize {
    animation-delay: 120ms;
  }

  #what-you-get {
    animation-delay: 150ms;
  }

  #why-spar-kit {
    animation-delay: 210ms;
  }

  #workflow {
    animation-delay: 270ms;
  }

  #further-reading {
    animation-delay: 330ms;
  }
}

@media (max-width: 720px) {
  body::after {
    background:
      radial-gradient(circle at 18% 12%, rgba(255, 183, 120, 0.16), transparent 15rem),
      radial-gradient(circle at 84% 20%, rgba(222, 122, 77, 0.13), transparent 17rem),
      radial-gradient(circle at 68% 72%, rgba(255, 212, 180, 0.06), transparent 14rem);
  }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}