:root {
  --ink: #111a2a;
  --blue: #0b5fff;
  --mist: #f4f8fc;
  --white: #ffffff;
  --line: #ccd8e8;
  --muted: #53657d;
  --pale-blue: #e8f0ff;
  --header-height: 86px;
  --axis-width: 174px;
  --page-gutter: clamp(20px, 5vw, 76px);
  --content-max: 1280px;
  --sans: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", "Source Han Sans SC", Arial, sans-serif;
  --mono: "Cascadia Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 28px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--mist);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-180%);
  transition: transform 160ms ease;
}

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

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}

.site-header {
  position: relative;
  z-index: 20;
  display: flex;
  min-height: var(--header-height);
  margin-right: var(--axis-width);
  padding: 17px var(--page-gutter);
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: rgba(244, 248, 252, 0.96);
}

.wordmark {
  display: inline-flex;
  max-width: 420px;
  text-decoration: none;
  flex-direction: column;
  line-height: 1.25;
}

.wordmark__cn {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.wordmark__en {
  margin-top: 4px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.18em;
}

.primary-nav {
  display: flex;
  gap: clamp(18px, 2.5vw, 40px);
}

.primary-nav a {
  position: relative;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
}

.primary-nav a::after {
  position: absolute;
  right: 0;
  bottom: -5px;
  left: 0;
  height: 1px;
  background: var(--blue);
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 160ms ease;
}

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

.primary-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.axis {
  position: fixed;
  z-index: 30;
  top: 0;
  right: 0;
  bottom: 0;
  display: flex;
  width: var(--axis-width);
  min-height: 560px;
  padding: 23px 22px 21px 26px;
  color: var(--white);
  background: var(--ink);
  flex-direction: column;
}

.axis__title,
.axis__domain {
  margin: 0;
  color: #aab8ca;
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.45;
  letter-spacing: 0.13em;
}

.axis__nav {
  position: relative;
  display: flex;
  margin: auto 0;
  padding: 13px 0;
  flex-direction: column;
  justify-content: space-between;
  gap: clamp(34px, 7vh, 72px);
}

.axis__nav::before {
  position: absolute;
  top: 19px;
  bottom: 19px;
  left: 4px;
  width: 1px;
  background: #43516a;
  content: "";
}

.axis__node {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 30px;
  color: #9cabbd;
  text-decoration: none;
  align-items: start;
  grid-template-columns: 9px 1fr;
  gap: 15px;
  transition: color 160ms ease;
}

.axis__dot {
  display: block;
  width: 9px;
  height: 9px;
  margin-top: 5px;
  border: 2px solid #75859a;
  border-radius: 50%;
  background: var(--ink);
  transition: border-color 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}

.axis__label {
  display: flex;
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.45;
  letter-spacing: 0.08em;
  flex-direction: column;
}

.axis__node:hover,
.axis__node[aria-current="location"] {
  color: var(--white);
}

.axis__node[aria-current="location"] .axis__label {
  color: #8fb3ff;
}

.axis__node[aria-current="location"] .axis__dot {
  border-color: var(--blue);
  background: var(--blue);
  box-shadow: 0 0 0 5px rgba(11, 95, 255, 0.18);
}

.axis__domain {
  writing-mode: vertical-rl;
  align-self: flex-end;
  transform: rotate(180deg);
}

main,
.site-footer {
  margin-right: var(--axis-width);
}

.observed-section {
  scroll-margin-top: 30px;
}

.hero {
  position: relative;
  display: flex;
  min-height: min(790px, calc(100vh - var(--header-height)));
  padding: clamp(54px, 8vw, 120px) var(--page-gutter) 0;
  background: var(--mist);
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.hero::before {
  position: absolute;
  top: 0;
  right: var(--page-gutter);
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent 0, var(--line) 12%, var(--line) 88%, transparent 100%);
  content: "";
}

.hero__grid {
  position: relative;
  display: grid;
  width: min(100%, var(--content-max));
  margin: 0 auto;
  grid-template-columns: minmax(130px, 0.3fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 100px);
}

.hero__reference {
  display: flex;
  padding-top: 15px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  flex-direction: column;
  gap: 9px;
}

.hero__reference span:first-child {
  color: var(--blue);
}

.eyebrow {
  margin: 0 0 30px;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.12em;
}

.hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(42px, 6.5vw, 92px);
  font-weight: 650;
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.hero h1 span {
  display: block;
}

.hero h1 span:last-child {
  margin-top: 0.08em;
  font-size: 0.73em;
  letter-spacing: -0.045em;
}

.hero__thesis {
  margin: clamp(30px, 5vw, 64px) 0 0;
  font-size: clamp(20px, 2vw, 28px);
  font-weight: 500;
  letter-spacing: 0.04em;
}

.hero__intro {
  max-width: 550px;
  margin: 15px 0 27px;
  color: var(--muted);
  font-size: 15px;
}

.text-link {
  display: inline-flex;
  padding: 4px 0;
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  text-underline-offset: 7px;
  align-items: center;
  gap: 14px;
}

.text-link span {
  color: var(--blue);
  font-family: var(--mono);
  font-size: 16px;
}

.hero__status {
  position: relative;
  display: grid;
  width: min(100%, var(--content-max));
  min-height: 78px;
  margin: clamp(55px, 8vw, 112px) auto 0;
  padding: 23px clamp(20px, 3vw, 42px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  align-items: center;
  grid-template-columns: 12px auto auto 1fr;
  gap: 11px;
}

.hero__status::before {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: var(--white);
  content: "";
  z-index: -1;
}

.status-mark,
.inline-status span {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
}

.hero__status strong {
  color: var(--ink);
  font-size: 15px;
}

.hero__status-date {
  font-family: var(--mono);
  justify-self: end;
}

.content-section {
  display: grid;
  padding: clamp(88px, 12vw, 164px) var(--page-gutter);
  border-top: 1px solid var(--line);
  background: var(--white);
  grid-template-columns: minmax(130px, 0.3fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 100px);
}

.section-index {
  color: var(--muted);
}

.section-index .eyebrow {
  margin-bottom: 18px;
}

.section-index__note {
  max-width: 150px;
  margin: 0;
  font-size: 12px;
  line-height: 1.65;
}

.information-plane {
  width: 100%;
  max-width: 980px;
}

.section-heading {
  display: grid;
  margin-bottom: clamp(40px, 6vw, 76px);
  padding-bottom: 28px;
  border-bottom: 1px solid var(--ink);
  align-items: end;
  grid-template-columns: minmax(200px, 0.65fr) minmax(240px, 0.35fr);
  gap: 34px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 620;
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.facts-list {
  display: grid;
  margin: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.fact {
  min-width: 0;
  padding: clamp(21px, 3vw, 34px);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--mist);
}

.fact--wide {
  grid-column: 1 / -1;
}

.fact dt {
  margin-bottom: 11px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.fact dd {
  margin: 0;
  font-size: clamp(16px, 1.65vw, 22px);
  font-weight: 600;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.data-value {
  font-family: var(--mono);
  letter-spacing: 0.015em;
}

.inline-status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

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

.scope-list li {
  display: grid;
  min-height: 156px;
  padding: clamp(25px, 3vw, 38px) 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
  grid-template-columns: minmax(60px, 0.22fr) 1fr;
  gap: 30px;
}

.scope-list__code {
  display: inline-flex;
  width: 30px;
  height: 30px;
  border: 1px solid var(--blue);
  color: var(--blue);
  font-family: var(--mono);
  font-size: 11px;
  align-items: center;
  justify-content: center;
}

.scope-list h3 {
  margin: 0 0 9px;
  font-size: clamp(19px, 2.1vw, 27px);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.scope-list p {
  max-width: 670px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.scope-note {
  display: grid;
  margin-top: 38px;
  padding: 24px 28px;
  border-left: 3px solid var(--blue);
  background: var(--pale-blue);
  grid-template-columns: 115px 1fr;
  gap: 24px;
}

.scope-note p {
  margin: 0;
  font-size: 13px;
}

.scope-note__label {
  color: var(--blue);
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.content-section--record {
  color: var(--white);
  border-color: #2d3b51;
  background: var(--ink);
}

.content-section--record .section-index,
.content-section--record .section-heading p {
  color: #aab8ca;
}

.content-section--record .section-heading {
  border-color: #6a7a91;
}

.information-plane--record .text-link {
  margin-top: 44px;
  color: var(--white);
}

.record-grid {
  display: grid;
  margin-bottom: clamp(44px, 6vw, 72px);
  border-top: 1px solid #43516a;
  border-left: 1px solid #43516a;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.record-item {
  display: flex;
  min-height: 130px;
  padding: 27px 30px;
  border-right: 1px solid #43516a;
  border-bottom: 1px solid #43516a;
  flex-direction: column;
  justify-content: space-between;
}

.record-item span {
  color: #aab8ca;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.record-item strong {
  font-size: clamp(18px, 2vw, 25px);
  font-weight: 550;
}

.record-statement {
  max-width: 760px;
  margin: 0;
  color: #d6e0ec;
  font-size: clamp(17px, 1.8vw, 22px);
  line-height: 1.85;
}

.site-footer {
  display: grid;
  min-height: 116px;
  padding: 30px var(--page-gutter);
  border-top: 1px solid #2d3b51;
  color: #aab8ca;
  background: var(--ink);
  font-size: 11px;
  align-items: center;
  grid-template-columns: 1fr auto auto;
  gap: 30px;
}

.site-footer p {
  margin: 0;
}

.site-footer > p:first-child {
  color: var(--white);
  font-size: 13px;
  font-weight: 600;
}

.site-footer__meta {
  font-family: var(--mono);
}

.site-footer a {
  color: #c1ccdb;
  text-underline-offset: 5px;
}

.error-main {
  display: grid;
  min-height: calc(100vh - var(--header-height) - 116px);
  padding: clamp(70px, 11vw, 160px) var(--page-gutter);
  background: var(--mist);
  align-items: center;
  grid-template-columns: minmax(180px, 0.36fr) minmax(0, 1fr);
  gap: clamp(38px, 8vw, 120px);
}

.error-main__code {
  color: var(--line);
  font-family: var(--mono);
  font-size: clamp(86px, 16vw, 220px);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.09em;
}

.error-main__message {
  max-width: 650px;
  padding-top: 22px;
  border-top: 1px solid var(--ink);
}

.error-main__message h1 {
  margin: 0 0 20px;
  font-size: clamp(32px, 4.5vw, 58px);
  font-weight: 620;
  line-height: 1.2;
  letter-spacing: -0.04em;
}

.error-main__message > p:not(.eyebrow) {
  max-width: 520px;
  margin: 0 0 28px;
  color: var(--muted);
}

.error-page .axis--error .axis__nav::before {
  bottom: 50%;
}

.has-js .observed-section .hero__statement,
.has-js .observed-section .information-plane {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 440ms ease, transform 440ms ease;
}

.has-js .observed-section.is-visible .hero__statement,
.has-js .observed-section.is-visible .information-plane {
  opacity: 1;
  transform: none;
}

@media (max-width: 980px) {
  :root {
    --axis-width: 0px;
    --header-height: 74px;
  }

  html {
    scroll-padding-top: 148px;
  }

  body {
    padding-top: calc(var(--header-height) + 64px);
  }

  .site-header,
  main,
  .site-footer {
    margin-right: 0;
  }

  .site-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 31;
  }

  .axis {
    top: var(--header-height);
    right: auto;
    bottom: auto;
    left: 0;
    width: 100%;
    min-height: 0;
    height: 64px;
    padding: 0 var(--page-gutter);
    border-bottom: 1px solid #394861;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .axis::-webkit-scrollbar {
    display: none;
  }

  .axis__title,
  .axis__domain {
    display: none;
  }

  .axis__nav {
    width: 100%;
    min-width: 0;
    margin: 0;
    padding: 0;
    align-items: stretch;
    flex-direction: row;
    gap: 0;
  }

  .axis__nav::before {
    top: 31px;
    right: 0;
    bottom: auto;
    left: 0;
    width: auto;
    height: 1px;
  }

  .axis__node {
    min-width: 0;
    min-height: 64px;
    padding: 16px 20px 0 0;
    align-items: start;
    flex: 1;
    grid-template-columns: 9px 1fr;
    gap: 10px;
  }

  .axis__dot {
    margin-top: 11px;
  }

  .axis__label {
    min-height: 30px;
    justify-content: center;
  }

  .hero {
    min-height: calc(100vh - 138px);
  }
}

@media (max-width: 720px) {
  :root {
    --header-height: 66px;
  }

  html {
    scroll-padding-top: 140px;
  }

  body {
    padding-top: calc(var(--header-height) + 58px);
  }

  .site-header {
    min-height: var(--header-height);
    padding-top: 13px;
    padding-bottom: 13px;
  }

  .wordmark__cn {
    max-width: 230px;
    font-size: 12px;
  }

  .wordmark__en {
    font-size: 8px;
  }

  .primary-nav {
    display: none;
  }

  .axis {
    top: var(--header-height);
    height: 58px;
  }

  .axis__nav {
    min-width: 0;
  }

  .axis__node {
    padding-right: 4px;
    grid-template-columns: 7px minmax(0, 1fr);
    gap: 5px;
  }

  .axis__dot {
    width: 7px;
    height: 7px;
    margin-top: 12px;
  }

  .axis__label {
    font-size: 8px;
    letter-spacing: 0.035em;
  }

  .axis__nav::before {
    top: 28px;
  }

  .axis__node {
    min-height: 58px;
    padding-top: 13px;
  }

  .hero {
    min-height: calc(100vh - 124px);
    padding-top: 50px;
  }

  .hero::before {
    display: none;
  }

  .hero__grid,
  .content-section,
  .error-main {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .error-main {
    align-content: center;
  }

  .error-main__code {
    font-size: clamp(82px, 27vw, 150px);
  }

  .hero__reference {
    padding: 0 0 17px;
    border-bottom: 1px solid var(--line);
    flex-direction: row;
    flex-wrap: wrap;
    gap: 7px 18px;
  }

  .eyebrow {
    margin-bottom: 22px;
  }

  .hero h1 {
    font-size: clamp(39px, 12.5vw, 62px);
    letter-spacing: -0.065em;
  }

  .hero h1 span:last-child {
    font-size: 0.66em;
  }

  .hero__intro {
    font-size: 14px;
  }

  .hero__status {
    min-height: 90px;
    padding-right: 20px;
    padding-left: 20px;
    grid-template-columns: 10px auto auto;
  }

  .hero__status-date {
    padding-top: 7px;
    grid-column: 1 / -1;
    justify-self: start;
  }

  .content-section {
    padding-top: 78px;
    padding-bottom: 82px;
  }

  .section-index {
    display: flex;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--line);
    align-items: baseline;
    justify-content: space-between;
    gap: 15px;
  }

  .content-section--record .section-index {
    border-color: #43516a;
  }

  .section-index .eyebrow {
    margin: 0;
  }

  .section-index__note {
    max-width: none;
    text-align: right;
  }

  .section-heading {
    margin-bottom: 40px;
    grid-template-columns: 1fr;
    gap: 13px;
  }

  .facts-list,
  .record-grid {
    grid-template-columns: 1fr;
  }

  .fact--wide {
    grid-column: auto;
  }

  .fact dd {
    font-size: 17px;
  }

  .scope-list li {
    min-height: 0;
    grid-template-columns: 42px 1fr;
    gap: 17px;
  }

  .scope-note {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .site-footer {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 380px) {
  .hero h1 {
    font-size: 38px;
  }

  .hero__reference span:last-child {
    display: none;
  }

  .section-index {
    display: block;
  }

  .section-index__note {
    margin-top: 8px;
    text-align: left;
  }

  .data-value {
    font-size: 15px;
  }
}

@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;
  }

  .has-js .observed-section .hero__statement,
  .has-js .observed-section .information-plane {
    opacity: 1;
    transform: none;
  }
}

@media print {
  .axis,
  .primary-nav,
  .skip-link,
  .text-link {
    display: none;
  }

  .site-header,
  main,
  .site-footer {
    margin-right: 0;
  }

  body,
  .content-section,
  .content-section--record,
  .site-footer {
    color: #000;
    background: #fff;
  }
}