:root {
  --ink: #071a3d;
  --ink-soft: #34445f;
  --teal: #087f86;
  --teal-dark: #065d63;
  --teal-pale: #e8f5f5;
  --amber: #b96500;
  --amber-pale: #fff6e7;
  --rule: #d8e0e8;
  --rule-strong: #b9c6d3;
  --wash: #f6f9fb;
  --white: #ffffff;
  --shadow: 0 18px 50px rgb(7 26 61 / 8%);
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --container: 1240px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: var(--teal-dark);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}

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

:focus-visible {
  outline: 3px solid #ffbf47;
  outline-offset: 3px;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 14px;
  transform: translateY(-160%);
  background: var(--ink);
  color: var(--white);
  border-radius: 6px;
}

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

.container {
  width: min(calc(100% - 48px), var(--container));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--header-height);
  background: rgb(255 255 255 / 96%);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  flex: 0 0 auto;
  color: var(--ink);
  font-size: 1.18rem;
  font-weight: 780;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  width: 28px;
  height: 28px;
  margin-right: 9px;
  place-items: center;
  border: 2px solid var(--teal);
  color: var(--teal-dark);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1;
  vertical-align: -2px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 25px;
}

.site-nav a {
  position: relative;
  padding-block: 23px 20px;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 15px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.site-nav .external::after,
.site-nav .language-link::after {
  display: none;
}

.external-icon {
  width: 13px;
  height: 13px;
  margin-left: 3px;
  display: inline-block;
  vertical-align: -1px;
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--rule-strong);
  background: var(--white);
  color: var(--ink);
  border-radius: 6px;
  cursor: pointer;
}

.menu-button span,
.menu-button::before,
.menu-button::after {
  display: block;
  width: 100%;
  height: 2px;
  content: "";
  background: currentColor;
}

.menu-button span {
  margin-block: 5px;
}

.hero {
  padding: 78px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(560px, 1.2fr);
  gap: clamp(44px, 6vw, 88px);
  align-items: center;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--ink);
  line-height: 1.12;
  text-wrap: balance;
}

h1 {
  max-width: 680px;
  margin-bottom: 24px;
  font-size: clamp(3rem, 5.2vw, 4.8rem);
  font-weight: 790;
  letter-spacing: -0.055em;
}

.hero-title-en {
  font-size: clamp(3rem, 3.8vw, 3.35rem);
}

@media (min-width: 1200px) {
  .hero-title-line {
    display: block;
    white-space: nowrap;
  }
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(2rem, 3.5vw, 3.25rem);
  font-weight: 760;
  letter-spacing: -0.04em;
}

h3 {
  margin-bottom: 12px;
  font-size: 1.2rem;
  font-weight: 720;
  letter-spacing: -0.018em;
}

.hero-copy > p {
  max-width: 640px;
  margin: 0 0 30px;
  color: var(--ink-soft);
  font-size: clamp(1.12rem, 1.8vw, 1.38rem);
  line-height: 1.55;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 22px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border: 1px solid var(--ink);
  color: var(--ink);
  border-radius: 6px;
  font-size: 0.94rem;
  font-weight: 720;
  text-decoration: none;
  transition:
    background 150ms ease,
    color 150ms ease,
    transform 150ms ease;
}

.button:hover {
  transform: translateY(-1px);
  background: var(--wash);
  color: var(--ink);
}

.button.primary {
  background: var(--ink);
  color: var(--white);
}

.button.primary:hover {
  background: #102b5e;
  color: var(--white);
}

.boundary-line {
  margin: 0;
  color: #607089;
  font-size: 0.86rem;
  font-weight: 580;
}

.hero-system {
  display: grid;
  grid-template-columns: 1.05fr 0.86fr 1fr 0.82fr;
  gap: 20px;
  align-items: center;
  min-height: 400px;
}

.flow-column,
.branch-column {
  display: grid;
  gap: 14px;
}

.flow-node {
  position: relative;
  min-height: 82px;
  padding: 14px 15px;
  border: 1px solid var(--teal);
  background: var(--white);
  border-radius: 7px;
}

.flow-node strong,
.flow-node span {
  display: block;
}

.flow-node strong {
  margin-bottom: 5px;
  font-size: 0.82rem;
  line-height: 1.25;
}

.flow-node span {
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.67rem;
  line-height: 1.45;
}

.flow-node::after {
  position: absolute;
  top: 50%;
  right: -21px;
  width: 20px;
  height: 1px;
  content: "";
  background: var(--teal);
}

.flow-node::before {
  position: absolute;
  top: calc(50% - 3px);
  right: -21px;
  width: 6px;
  height: 6px;
  content: "";
  border-top: 1px solid var(--teal);
  border-right: 1px solid var(--teal);
  transform: rotate(45deg);
}

.flow-node:last-child::after,
.flow-node:last-child::before {
  display: none;
}

.flow-hub {
  min-height: 120px;
  display: grid;
  place-content: center;
  text-align: center;
}

.flow-hub::after,
.flow-hub::before {
  display: block;
}

.branch-column .flow-node {
  min-height: 68px;
}

.review-node {
  min-height: 136px;
  display: grid;
  place-content: center;
  text-align: center;
}

.section {
  padding: clamp(68px, 8vw, 105px) 0;
  border-top: 1px solid var(--rule);
}

.section.wash {
  background: var(--wash);
}

.section-intro {
  max-width: 760px;
  margin-bottom: 46px;
}

.section-intro p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.12rem;
}

.stage-rail {
  display: grid;
  grid-template-columns: repeat(5, minmax(150px, 1fr));
  gap: 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

.stage {
  position: relative;
  min-width: 150px;
  padding: 8px 28px 12px 0;
}

.stage:not(:last-child)::after {
  position: absolute;
  top: 27px;
  right: 8px;
  width: 28px;
  height: 1px;
  content: "";
  background: var(--teal);
}

.stage-number {
  display: grid;
  width: 40px;
  height: 40px;
  margin-bottom: 17px;
  place-items: center;
  border: 1px solid var(--teal);
  color: var(--teal-dark);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
}

.stage strong {
  display: block;
  margin-bottom: 4px;
  font-size: 0.94rem;
}

.stage p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.83rem;
  line-height: 1.5;
}

.audience-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-top: 60px;
  padding-top: 38px;
  border-top: 1px solid var(--rule);
}

.audience-link {
  color: var(--ink);
  text-decoration: none;
}

.audience-link span {
  display: block;
  color: var(--teal-dark);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.audience-link strong {
  display: block;
  margin: 7px 0;
  font-size: 1.35rem;
}

.audience-link p {
  margin: 0;
  color: var(--ink-soft);
}

.responsibility-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.responsibility {
  position: relative;
  padding-top: 28px;
  border-top: 3px solid var(--teal);
}

.responsibility:not(:last-child)::after {
  position: absolute;
  top: -2px;
  right: -20px;
  width: 12px;
  height: 12px;
  content: "";
  border-top: 2px solid var(--teal);
  border-right: 2px solid var(--teal);
  transform: rotate(45deg);
}

.responsibility-index {
  display: block;
  margin-bottom: 8px;
  color: var(--teal-dark);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.responsibility p,
.output-list p,
.technical-column p {
  color: var(--ink-soft);
}

.nine-stage {
  display: grid;
  grid-template-columns: repeat(9, minmax(105px, 1fr));
  gap: 0;
  margin: 58px 0 40px;
  overflow-x: auto;
}

.nine-stage div {
  position: relative;
  min-width: 105px;
  padding-right: 16px;
  text-align: center;
}

.nine-stage div:not(:last-child)::after {
  position: absolute;
  top: 18px;
  right: -1px;
  left: 37px;
  height: 1px;
  content: "";
  background: var(--teal);
}

.nine-stage span {
  position: relative;
  z-index: 1;
  display: grid;
  width: 38px;
  height: 38px;
  margin: 0 auto 12px;
  place-items: center;
  border: 1px solid var(--teal);
  background: var(--white);
  color: var(--teal-dark);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
}

.nine-stage strong {
  display: block;
  font-size: 0.74rem;
  line-height: 1.35;
}

.notice {
  display: flex;
  align-items: flex-start;
  gap: 17px;
  padding: 20px 22px;
  border: 1px solid #df9c42;
  background: var(--amber-pale);
  color: #6d3a00;
  border-radius: 8px;
}

.notice svg {
  flex: 0 0 24px;
  margin-top: 2px;
}

.notice p {
  margin: 0;
}

.notice strong {
  color: var(--amber);
}

.notice-spaced {
  margin-top: 42px;
}

.output-grid {
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  gap: clamp(42px, 7vw, 94px);
  align-items: start;
}

.output-list {
  counter-reset: output;
}

.output-item {
  position: relative;
  padding: 18px 0 18px 54px;
  border-bottom: 1px solid var(--rule);
  counter-increment: output;
}

.output-item::before {
  position: absolute;
  top: 20px;
  left: 0;
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  content: counter(output, decimal-leading-zero);
  border: 1px solid var(--teal);
  color: var(--teal-dark);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
}

.output-item h3,
.output-item p {
  margin: 0;
}

.code-window {
  overflow: hidden;
  border: 1px solid var(--rule-strong);
  background: #fbfcfd;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.code-header {
  display: flex;
  min-height: 46px;
  align-items: center;
  justify-content: space-between;
  padding: 8px 13px 8px 18px;
  border-bottom: 1px solid var(--rule);
  background: var(--white);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.copy-button {
  padding: 5px 9px;
  border: 1px solid var(--rule-strong);
  background: var(--white);
  color: var(--ink);
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  cursor: pointer;
}

.copy-button:hover {
  background: var(--wash);
}

pre {
  margin: 0;
  padding: 22px;
  overflow: auto;
  color: #14233d;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  tab-size: 2;
}

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

.code-key {
  color: #066b72;
}

.code-string {
  color: #8a4f00;
}

.architecture {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  overflow-x: auto;
  border-block: 1px solid var(--rule);
}

.architecture-column {
  min-width: 200px;
  padding: 26px 22px;
  border-right: 1px dashed var(--rule-strong);
}

.architecture-column:last-child {
  border-right: 0;
}

.architecture-column > span {
  display: block;
  margin-bottom: 18px;
  color: var(--teal-dark);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.architecture-node {
  margin-bottom: 10px;
  padding: 12px;
  border: 1px solid var(--teal);
  border-radius: 6px;
  font-size: 0.78rem;
  line-height: 1.45;
}

.architecture-node strong {
  display: block;
  margin-bottom: 3px;
}

.architecture-node small {
  color: var(--ink-soft);
}

.dependency-line {
  margin: 22px 0 44px;
  padding: 13px 18px;
  border: 1px solid var(--teal);
  font-family: var(--font-mono);
  font-size: clamp(0.78rem, 2vw, 1.02rem);
  text-align: center;
}

.technical-grid {
  display: grid;
  grid-template-columns: 1fr 0.8fr 1fr;
  gap: 36px;
}

.technical-column {
  padding-top: 22px;
  border-top: 2px solid var(--ink);
}

.technical-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.technical-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.technical-list code {
  color: var(--teal-dark);
  font-size: 0.76rem;
  overflow-wrap: anywhere;
}

.profile-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  padding: 9px 0;
  border-bottom: 1px solid var(--rule);
}

.profile-row strong:last-child {
  color: var(--teal-dark);
  font-family: var(--font-mono);
}

.validation-table-wrap {
  overflow-x: auto;
}

.validation-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--rule);
}

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

.validation-table th,
.validation-table td {
  padding: 17px 20px;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}

.validation-table th {
  background: var(--wash);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.validation-table td:first-child {
  font-weight: 700;
}

.status-passed {
  color: var(--teal-dark);
  font-weight: 760;
}

.status-pending {
  color: var(--amber);
  font-weight: 760;
}

.validation-columns {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr;
  gap: 36px;
  margin-top: 44px;
}

.validation-statement {
  padding-right: 32px;
  border-right: 1px solid var(--rule-strong);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  font-weight: 720;
  line-height: 1.45;
  letter-spacing: -0.025em;
}

.validation-list {
  margin: 0;
  padding-left: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.validation-list li {
  margin-bottom: 7px;
}

.quickstart-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: clamp(44px, 7vw, 92px);
  align-items: start;
}

.quickstart-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: quickstart;
}

.quickstart-steps li {
  position: relative;
  padding: 0 0 28px 52px;
  counter-increment: quickstart;
}

.quickstart-steps li::before {
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  content: counter(quickstart);
  border: 1px solid var(--teal);
  color: var(--teal-dark);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-weight: 700;
}

.quickstart-steps strong,
.quickstart-steps span {
  display: block;
}

.quickstart-steps span {
  color: var(--ink-soft);
}

.safety-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
}

.plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.plain-list li {
  padding: 13px 0 13px 25px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}

.plain-list li::before {
  position: absolute;
  top: 23px;
  left: 2px;
  width: 7px;
  height: 7px;
  content: "";
  border: 1px solid var(--teal);
  transform: rotate(45deg);
}

.site-footer {
  padding: 42px 0 52px;
  border-top: 1px solid var(--rule);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 50px;
}

.footer-brand {
  margin: 0 0 8px;
  font-weight: 760;
}

.footer-note {
  max-width: 650px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 22px;
}

.footer-links a {
  color: var(--ink);
  font-size: 0.86rem;
  font-weight: 650;
  text-decoration: none;
}

.meta-line {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  color: #687790;
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

@media (max-width: 1080px) {
  .site-nav {
    gap: 15px;
  }

  .site-nav a {
    font-size: 0.82rem;
  }

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

  .hero-copy {
    max-width: 780px;
  }

  .hero-system {
    max-width: 840px;
  }

  .responsibility-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 42px;
  }

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

  .technical-grid,
  .validation-columns {
    grid-template-columns: 1fr 1fr;
  }

  .validation-statement {
    grid-column: 1 / -1;
    padding: 0 0 28px;
    border-right: 0;
    border-bottom: 1px solid var(--rule-strong);
  }
}

@media (max-width: 860px) {
  :root {
    --header-height: 64px;
  }

  .container {
    width: min(calc(100% - 32px), var(--container));
  }

  .menu-button {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    bottom: 0;
    left: 0;
    display: none;
    padding: 24px;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    background: var(--white);
    overflow-y: auto;
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 15px 4px;
    border-bottom: 1px solid var(--rule);
    font-size: 1rem;
  }

  .site-nav a::after {
    display: none;
  }

  .hero {
    padding-top: 54px;
  }

  h1 {
    font-size: clamp(2.85rem, 13vw, 4.6rem);
  }

  .output-grid,
  .quickstart-grid,
  .safety-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .hero-system {
    grid-template-columns: 1fr;
    gap: 10px;
  }

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

  .flow-node {
    min-height: 72px;
  }

  .flow-node::before,
  .flow-node::after {
    display: none;
  }

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

  .flow-hub,
  .review-node {
    min-height: 80px;
  }

  .responsibility-grid,
  .audience-links,
  .technical-grid,
  .validation-columns {
    grid-template-columns: 1fr;
  }

  .responsibility::after {
    display: none;
  }

  .nine-stage,
  .stage-rail {
    margin-right: -16px;
    padding-right: 16px;
  }

  .architecture {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .architecture-column {
    min-width: 0;
    border-right: 0;
    border-bottom: 1px dashed var(--rule-strong);
  }

  .architecture-column:last-child {
    border-bottom: 0;
  }

  .validation-table th,
  .validation-table td {
    min-width: 160px;
    padding: 14px;
  }

  .actions .button {
    width: 100%;
  }

  .section {
    padding-block: 62px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}