:root {
  color-scheme: light;
  --paper: #f7f8fa;
  --surface: #ffffff;
  --ink: #101217;
  --ink-soft: #303642;
  --muted: #606978;
  --rule: #dce1e8;
  --rule-strong: #bec6d2;
  --blue: #2456e6;
  --blue-dark: #173ca8;
  --blue-pale: #edf2ff;
  --terminal: #0d1119;
  --terminal-rule: #263044;
  --terminal-text: #e8edf6;
  --terminal-muted: #919db1;
  --success: #43d39e;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --shadow: 0 24px 70px rgba(16, 18, 23, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--blue);
  color: #ffffff;
}

a {
  color: inherit;
  text-decoration-color: rgba(36, 86, 230, 0.55);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--blue-dark);
}

a:focus-visible,
pre:focus-visible {
  outline: 3px solid rgba(36, 86, 230, 0.35);
  outline-offset: 4px;
  border-radius: 3px;
}

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

code {
  font-size: 0.88em;
}

p,
h1,
h2,
h3,
ul,
ol,
dl,
dd {
  margin-top: 0;
}

.shell {
  width: min(calc(100% - 3rem), 73.75rem);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: -5rem;
  left: 1rem;
  padding: 0.7rem 1rem;
  background: var(--ink);
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  background: rgba(247, 248, 250, 0.96);
  border-bottom: 1px solid var(--rule);
}

.header-inner {
  min-height: 4.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  font-size: 0.96rem;
  font-weight: 760;
  letter-spacing: -0.015em;
  text-decoration: none;
}

.brand:hover {
  color: var(--ink);
}

.brand-mark {
  width: 1.75rem;
  height: 1.75rem;
  flex: none;
}

.brand-mark rect {
  fill: var(--blue);
}

.brand-mark path {
  fill: none;
  stroke: #ffffff;
  stroke-linecap: round;
  stroke-width: 1.8;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2rem);
  font-size: 0.88rem;
  font-weight: 620;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--ink);
}

.hero {
  min-height: 41rem;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(30rem, 0.98fr);
  align-items: center;
  gap: clamp(3rem, 6vw, 5.5rem);
  padding-block: clamp(4.5rem, 8vw, 7rem);
}

.hero h1,
.section-intro h2,
.closing h2,
.page-header h1,
.not-found h1 {
  letter-spacing: -0.05em;
  line-height: 1.01;
  text-wrap: balance;
}

.hero h1 {
  max-width: 12.5ch;
  margin-bottom: 1.65rem;
  font-size: clamp(3.25rem, 6.2vw, 5.35rem);
  font-weight: 780;
}

.hero-lede {
  max-width: 39rem;
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.15rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.15rem;
  border: 1px solid var(--blue);
  border-radius: 7px;
  background: var(--blue);
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 720;
  text-decoration: none;
}

.button:hover {
  border-color: var(--blue-dark);
  background: var(--blue-dark);
  color: #ffffff;
}

.text-link {
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 700;
}

.terminal {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--terminal-rule);
  border-radius: 12px;
  background: var(--terminal);
  box-shadow: var(--shadow);
  color: var(--terminal-text);
}

.terminal-bar {
  min-height: 2.9rem;
  display: flex;
  align-items: center;
  gap: 0.42rem;
  padding: 0 1rem;
  border-bottom: 1px solid var(--terminal-rule);
}

.terminal-bar span {
  width: 0.62rem;
  height: 0.62rem;
  border-radius: 50%;
  background: #3b4558;
}

.terminal-bar strong {
  margin-left: auto;
  color: var(--terminal-muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
}

.terminal pre {
  min-height: 18rem;
  display: flex;
  align-items: center;
  margin: 0;
  padding: clamp(1.4rem, 3vw, 2.2rem);
  overflow-x: auto;
  font-size: clamp(0.84rem, 1.2vw, 0.9rem);
  line-height: 1.8;
}

.terminal code {
  min-width: max-content;
}

.terminal .prompt {
  color: #7ba0ff;
}

.terminal .quiet {
  color: var(--terminal-muted);
}

.terminal .success {
  color: var(--success);
}

.terminal-foot {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--terminal-rule);
  color: var(--terminal-muted);
  font-family: var(--mono);
  font-size: 0.68rem;
  text-align: center;
}

.terminal-foot span {
  padding: 0.9rem 0.55rem;
}

.terminal-foot span + span {
  border-left: 1px solid var(--terminal-rule);
}

.section {
  padding-block: clamp(5rem, 8vw, 8rem);
  border-top: 1px solid var(--rule);
}

.section-intro {
  max-width: 46rem;
  margin-bottom: clamp(2.7rem, 5vw, 4.5rem);
}

.section-intro h2 {
  margin-bottom: 1.2rem;
  font-size: clamp(2.35rem, 4.5vw, 4rem);
  font-weight: 760;
}

.section-intro p {
  max-width: 42rem;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule-strong);
  list-style: none;
}

.flow li {
  position: relative;
  min-width: 0;
  padding: 1.5rem clamp(1rem, 2.2vw, 1.75rem) 0 0;
}

.flow li:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 1.32rem;
  right: 1rem;
  color: var(--blue);
  font-size: 1.2rem;
}

.flow-number {
  display: block;
  margin-bottom: 2.4rem;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
}

.flow strong {
  display: block;
  margin-bottom: 0.55rem;
  font-size: 1rem;
}

.flow p {
  min-height: 5.2rem;
  margin-bottom: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.flow code {
  display: inline-block;
  max-width: 100%;
  overflow: hidden;
  color: var(--ink-soft);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.use-section {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(28rem, 1.25fr);
  gap: clamp(3rem, 8vw, 7rem);
}

.use-section .section-intro {
  margin-bottom: 0;
}

.answer-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule-strong);
  list-style: none;
}

.answer-list li {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 1.5rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.91rem;
}

.answer-list span {
  color: var(--muted);
}

.answer-list strong {
  font-weight: 680;
}

.quickstart {
  border-top: 1px solid var(--rule-strong);
}

.quickstep {
  display: grid;
  grid-template-columns: minmax(12rem, 0.44fr) minmax(0, 1.56fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: start;
  padding-block: 1.75rem;
  border-bottom: 1px solid var(--rule);
}

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

.quickstep-title {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.quickstep-title span {
  color: var(--blue);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
}

.quickstep-title h3 {
  margin: 0;
  font-size: 0.98rem;
}

.quickstep-copy p {
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.quickstep pre,
.receipt-code {
  margin: 0;
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink-soft);
  font-size: 0.86rem;
  line-height: 1.75;
}

.quickstep pre {
  padding: 1.2rem 1.35rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.documentation-link {
  margin: 1.8rem 0 0;
  font-size: 0.9rem;
  font-weight: 680;
}

.boundary-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
}

.boundary-columns > div {
  padding-top: 1.4rem;
  border-top: 2px solid var(--ink);
}

.boundary-columns > div:first-child {
  border-top-color: var(--blue);
}

.boundary-columns h3 {
  margin-bottom: 1.4rem;
  font-size: 1rem;
}

.boundary-columns ul {
  margin-bottom: 0;
  padding: 0;
  list-style: none;
}

.boundary-columns li {
  position: relative;
  padding: 0.47rem 0 0.47rem 1.35rem;
  color: var(--ink-soft);
  font-size: 0.93rem;
}

.boundary-columns li::before {
  content: "";
  position: absolute;
  top: 1.05rem;
  left: 0;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: var(--rule-strong);
}

.boundary-columns > div:first-child li::before {
  background: var(--blue);
}

.receipt-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(3rem, 7vw, 6rem);
  align-items: start;
}

.receipt-code {
  padding: clamp(1.4rem, 3vw, 2rem);
  background: var(--terminal);
  color: var(--terminal-text);
  border-color: var(--terminal-rule);
}

.example-code {
  min-width: 0;
}

.example-note {
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.receipt-copy h3 {
  margin: 0 0 0.55rem;
  font-size: 1rem;
}

.receipt-copy h3:not(:first-child) {
  margin-top: 2rem;
}

.receipt-copy p {
  color: var(--muted);
  font-size: 0.94rem;
}

.receipt-copy code,
.page-body code,
.questions code {
  padding: 0.08em 0.32em;
  border-radius: 4px;
  background: var(--blue-pale);
  color: var(--ink-soft);
}

.questions .section-intro {
  margin-bottom: 2.2rem;
}

.questions dl {
  margin-bottom: 0;
  border-top: 1px solid var(--rule-strong);
}

.questions dl > div {
  display: grid;
  grid-template-columns: minmax(13rem, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(2rem, 7vw, 7rem);
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--rule);
}

.questions dt {
  font-weight: 700;
}

.questions dd {
  margin: 0;
  color: var(--muted);
}

.closing {
  background: var(--ink);
  color: #ffffff;
}

.closing-inner {
  min-height: 18rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  padding-block: 4rem;
}

.closing h2 {
  margin-bottom: 0.7rem;
  font-size: clamp(2.4rem, 4.7vw, 4.2rem);
  font-weight: 760;
}

.closing p {
  margin-bottom: 0;
  color: #b8c0ce;
}

.button-light {
  flex: none;
  border-color: #ffffff;
  background: #ffffff;
  color: var(--ink);
}

.button-light:hover {
  border-color: #dfe5ef;
  background: #dfe5ef;
  color: var(--ink);
}

.site-footer {
  border-top: 1px solid var(--rule);
  background: var(--surface);
}

.footer-inner {
  min-height: 6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.footer-inner p {
  margin-bottom: 0;
}

.footer-inner nav {
  display: flex;
  gap: 1.4rem;
}

.footer-inner a[aria-current="page"] {
  color: var(--ink);
  font-weight: 680;
}

.page {
  min-height: calc(100vh - 10.75rem);
  padding-block: clamp(4.5rem, 8vw, 7rem);
}

.page-header {
  max-width: 50rem;
  padding-bottom: clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--rule-strong);
}

.page-header h1 {
  margin-bottom: 1.25rem;
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 780;
}

.page-header p {
  max-width: 43rem;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.page-body {
  max-width: 50rem;
}

.page-body section {
  padding-block: 2.5rem;
  border-bottom: 1px solid var(--rule);
}

.page-body h2 {
  margin-bottom: 1rem;
  font-size: 1.4rem;
  letter-spacing: -0.025em;
}

.page-body p,
.page-body li {
  color: var(--ink-soft);
}

.page-body li + li {
  margin-top: 0.4rem;
}

.not-found {
  min-height: calc(100vh - 10.75rem);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding-block: 5rem;
}

.error-code {
  margin-bottom: 1rem;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
}

.not-found h1 {
  max-width: 12ch;
  margin-bottom: 1.25rem;
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 780;
}

.not-found > p:not(.error-code) {
  max-width: 34rem;
  margin-bottom: 2rem;
  color: var(--muted);
}

@media (max-width: 900px) {
  .hero {
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 3.5rem;
  }

  .hero h1 {
    max-width: 13ch;
  }

  .terminal {
    max-width: 42rem;
  }

  .flow {
    grid-template-columns: 1fr 1fr;
    row-gap: 3rem;
  }

  .flow li:nth-child(2)::after {
    display: none;
  }

  .flow p {
    min-height: 0;
  }

  .use-section {
    grid-template-columns: 1fr;
  }

  .use-section .section-intro {
    margin-bottom: 0;
  }

  .receipt-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .shell {
    width: min(calc(100% - 2rem), 73.75rem);
  }

  .header-inner {
    min-height: 4.25rem;
    align-items: center;
  }

  .brand span {
    font-size: 0.82rem;
  }

  .site-nav {
    gap: 0.9rem;
    font-size: 0.77rem;
  }

  .site-nav a:nth-child(2) {
    display: none;
  }

  .hero {
    padding-block: 4.25rem 5rem;
  }

  .hero h1 {
    font-size: clamp(2.9rem, 14vw, 4rem);
  }

  .terminal pre {
    min-height: 15rem;
  }

  .terminal-foot {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .terminal-foot span {
    padding: 0.65rem 1rem;
  }

  .terminal-foot span + span {
    border-top: 1px solid var(--terminal-rule);
    border-left: 0;
  }

  .section {
    padding-block: 4.5rem;
  }

  .section-intro {
    margin-bottom: 2.7rem;
  }

  .section-intro h2 {
    font-size: clamp(2.25rem, 11vw, 3.2rem);
  }

  .flow {
    grid-template-columns: 1fr;
    row-gap: 0;
    border-top: 0;
    border-left: 1px solid var(--rule-strong);
  }

  .flow li {
    padding: 0 0 2.8rem 1.4rem;
  }

  .flow li:not(:last-child)::after {
    content: "↓";
    top: auto;
    right: auto;
    bottom: 0.7rem;
    left: -0.52rem;
    padding: 0.1rem;
    background: var(--paper);
  }

  .flow-number {
    margin-bottom: 0.9rem;
  }

  .answer-list li {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .quickstep {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .boundary-columns {
    grid-template-columns: 1fr;
  }

  .questions dl > div {
    grid-template-columns: 1fr;
    gap: 0.6rem;
  }

  .closing-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .closing-inner {
    justify-content: center;
  }

  .footer-inner {
    justify-content: center;
    padding-block: 1.7rem;
  }

  .page,
  .not-found {
    min-height: 0;
  }
}

@media (max-width: 360px) {
  .header-inner {
    gap: 0.5rem;
  }

  .brand {
    gap: 0.5rem;
    white-space: nowrap;
  }

  .brand-mark {
    width: 1.5rem;
    height: 1.5rem;
  }

  .brand span {
    font-size: 0.74rem;
  }

  .site-nav {
    gap: 0.7rem;
    font-size: 0.7rem;
    white-space: nowrap;
  }
}

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