:root {
  color-scheme: dark;
  --bg: #101114;
  --panel: #191b20;
  --panel-2: #15171c;
  --text: #edf0f4;
  --muted: #8d929d;
  --dim: #666b75;
  --line: #3a3e47;
  --line-strong: #545966;
  --accent: #c75fc8;
  --accent-soft: rgba(199, 95, 200, 0.12);
  --accent-line: rgba(199, 95, 200, 0.72);
  --ok: #d7f6dd;
  --content: 1320px;
  --mono: "IBM Plex Mono", "Cascadia Mono", monospace;
  --sans: Inter, "Segoe UI", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 0;
  background:
    linear-gradient(90deg, rgba(199, 95, 200, 0.04) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    var(--bg);
  background-size: 64px 64px;
  color: var(--text);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-underline-offset: 0.22em;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.page-shell {
  width: min(100% - 24px, var(--content));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.masthead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.46fr);
  gap: 56px;
  padding: 4px 0 28px 18px;
  border-left: 2px solid var(--accent);
  border-bottom: 1px solid var(--line-strong);
  position: relative;
}

.masthead::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 124px;
  height: 1px;
  background: var(--accent);
}

.brand-line {
  width: 46px;
  height: 3px;
  margin-bottom: 18px;
  background: var(--accent);
}

.eyebrow,
.kicker,
.node-code,
.status-matrix,
.tech-table,
.capability-grid,
.side-note-label,
.notice-flag,
.footer,
.identity-stack {
  font-family: "IBM Plex Mono", "Cascadia Mono", monospace;
  letter-spacing: 0.075em;
}

.eyebrow,
.kicker {
  margin: 0;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
}

h1,
h2,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 3px 0 0;
  font-family: var(--mono);
  font-size: clamp(3.35rem, 8vw, 6.8rem);
  line-height: 0.92;
  letter-spacing: -0.075em;
  font-weight: 650;
}

.program-name {
  max-width: 670px;
  margin: 18px 0 28px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.55;
  letter-spacing: 0.04em;
}

.identity-stack {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  font-size: 0.76rem;
  color: var(--muted);
}

.identity-stack strong {
  color: var(--text);
  font-size: 0.94rem;
  font-weight: 650;
}

.status-matrix,
.tech-table,
.capability-grid,
.footer dl {
  margin: 0;
}

.status-matrix {
  align-self: end;
  border-left: 1px solid var(--line);
  border-top: 1px solid var(--line);
  font-size: 0.68rem;
}

.status-matrix > div {
  display: grid;
  grid-template-columns: 0.85fr 1fr;
  min-width: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.status-matrix dt,
.status-matrix dd {
  margin: 0;
  padding: 9px 11px;
}

.status-matrix dt {
  color: var(--dim);
}

.status-matrix dd {
  color: var(--text);
  border-left: 1px solid var(--line);
}

.status-mark {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  background: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
  vertical-align: 0.05em;
}

.section {
  position: relative;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  column-gap: 26px;
  padding: 62px 0;
  border-bottom: 1px solid var(--line-strong);
}

.section-index {
  padding-top: 2px;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
}

.section-heading,
.copy-grid,
.gateway-grid,
.flow,
.architecture-notes,
.notice-box {
  grid-column: 2;
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 30px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  line-height: 1.15;
  letter-spacing: -0.035em;
  font-weight: 620;
}

.copy-grid,
.gateway-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  gap: 54px;
  align-items: start;
}

.prose {
  max-width: 720px;
}

.prose p {
  margin: 0 0 1.15em;
  color: #d5d7dc;
}

.prose p:last-child {
  margin-bottom: 0;
}

.tech-table,
.capability-grid {
  border-top: 1px solid var(--line-strong);
  font-size: 0.68rem;
}

.tech-table > div,
.capability-grid > div {
  display: grid;
  grid-template-columns: minmax(120px, 0.9fr) minmax(0, 1.35fr);
  gap: 18px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.tech-table dt,
.capability-grid dt {
  color: var(--dim);
}

.tech-table dd,
.capability-grid dd {
  margin: 0;
  color: var(--text);
  overflow-wrap: anywhere;
}

.capability-grid dd {
  position: relative;
  padding-left: 15px;
}

.capability-grid dd::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--accent);
}

.flow {
  display: grid;
  grid-template-columns: repeat(11, minmax(0, auto));
  align-items: stretch;
  margin: 6px 0 38px;
}

.flow-node {
  position: relative;
  min-width: 0;
  padding: 18px 16px 16px;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 2px) 0, 100% 2px, 100% 100%, 2px 100%, 0 calc(100% - 2px));
}

.flow-node::before {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 18px;
  height: 18px;
  border-top: 1px solid var(--accent-line);
  border-right: 1px solid var(--accent-line);
}

.node-code {
  display: block;
  margin-bottom: 14px;
  color: var(--accent);
  font-size: 0.61rem;
}

.flow-node strong {
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  line-height: 1.45;
  letter-spacing: 0.055em;
}

.flow-node small {
  display: block;
  margin-top: 7px;
  color: var(--dim);
  font-size: 0.69rem;
  line-height: 1.45;
}

.flow-link {
  width: 24px;
  display: grid;
  align-items: center;
}

.flow-link span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--line-strong);
  position: relative;
}

.flow-link span::after {
  content: "";
  position: absolute;
  right: 0;
  top: -3px;
  width: 6px;
  height: 6px;
  border-top: 1px solid var(--accent);
  border-right: 1px solid var(--accent);
  transform: rotate(45deg);
}

.architecture-notes {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
  gap: 42px;
  align-items: stretch;
}

.tech-table.compact > div {
  grid-template-columns: minmax(150px, 0.9fr) minmax(0, 1.1fr);
}

.side-note {
  position: relative;
  padding: 22px;
  border-left: 2px solid var(--accent);
  background: var(--panel-2);
}

.side-note-label {
  color: var(--accent);
  font-size: 0.61rem;
}

.side-note strong {
  display: block;
  margin: 12px 0 10px;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

.side-note p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.notice-box {
  position: relative;
  padding: 26px 28px 24px;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 2px) 0, 100% 2px, 100% 100%, 2px 100%, 0 calc(100% - 2px));
}

.notice-box::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--accent);
}

.notice-flag {
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 0.66rem;
}

.notice-box p {
  margin: 0 0 0.95em;
  color: #d1d3d8;
}

.notice-box p:last-child {
  margin-bottom: 0;
}

.notice-en {
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted) !important;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
}

.footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  padding: 28px 0 6px;
  color: var(--muted);
  font-size: 0.64rem;
}

.footer > div strong,
.footer > div span {
  display: block;
}

.footer > div strong {
  color: var(--text);
  margin-bottom: 3px;
}

.footer dl {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 8px 24px;
}

.footer dl > div {
  display: grid;
  grid-template-columns: auto auto;
  gap: 8px;
}

.footer dt {
  color: var(--dim);
}

.footer dd {
  margin: 0;
  color: var(--text);
}

@media (max-width: 900px) {
  .masthead {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .status-matrix {
    align-self: auto;
  }

  .copy-grid,
  .gateway-grid,
  .architecture-notes {
    grid-template-columns: 1fr;
    gap: 34px;
  }

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

  .flow-link {
    width: 1px;
    height: 24px;
    justify-self: start;
    margin-left: 22px;
  }

  .flow-link span {
    width: 1px;
    height: 100%;
  }

  .flow-link span::after {
    right: -3px;
    top: auto;
    bottom: 0;
    transform: rotate(135deg);
  }
}

@media (max-width: 620px) {
  body {
    font-size: 15px;
  }

  .page-shell {
    width: min(100% - 24px, var(--content));
    padding-top: 18px;
  }

  .masthead {
    padding: 24px 0 30px;
  }

  h1 {
    font-size: clamp(3.05rem, 19vw, 5.2rem);
  }

  .program-name {
    font-size: 0.7rem;
  }

  .status-matrix {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-left: 0;
    border-top: 0;
    gap: 1px;
    background: var(--line);
  }

  .status-matrix > div {
    display: block;
    background: var(--bg);
    border: 0;
    min-height: 66px;
  }

  .status-matrix dt,
  .status-matrix dd {
    padding: 7px 9px;
  }

  .status-matrix dd {
    border-left: 0;
    padding-top: 0;
  }

  .section {
    grid-template-columns: 34px minmax(0, 1fr);
    column-gap: 12px;
    padding: 44px 0;
  }

  .section-heading {
    display: block;
    margin-bottom: 24px;
  }

  .section-heading h2 {
    margin-top: 6px;
  }

  .tech-table > div,
  .capability-grid > div,
  .tech-table.compact > div {
    grid-template-columns: 1fr;
    gap: 3px;
    padding: 10px 0 11px;
  }

  .capability-grid dd {
    padding-left: 13px;
  }

  .flow-node {
    padding: 15px 14px;
  }

  .notice-box {
    padding: 20px 20px 19px;
  }

  .footer {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .footer dl {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}


/* 0.1.2 mobile layout correction: remove the reserved section-index gutter. */
.section-mobile-head {
  display: none;
}

@media (max-width: 620px) {
  .page-shell {
    width: min(100% - 36px, var(--content));
    padding-top: 14px;
    padding-bottom: 36px;
  }

  .masthead {
    gap: 18px;
    padding: 18px 0 20px 14px;
  }

  .brand-line {
    width: 32px;
    height: 2px;
    margin-bottom: 11px;
  }

  .eyebrow {
    font-size: 0.62rem;
    line-height: 1.45;
    letter-spacing: 0.065em;
  }

  h1 {
    margin-top: 5px;
    font-size: clamp(2.65rem, 14vw, 3.7rem);
    line-height: 0.94;
  }

  .program-name {
    max-width: 32rem;
    margin: 11px 0 15px;
    font-size: 0.64rem;
    line-height: 1.5;
  }

  .identity-stack {
    gap: 4px 12px;
    font-size: 0.66rem;
    line-height: 1.45;
  }

  .identity-stack strong {
    width: 100%;
    font-size: 0.79rem;
  }

  .status-matrix > div {
    min-height: 50px;
  }

  .status-matrix dt,
  .status-matrix dd {
    padding-left: 8px;
    padding-right: 8px;
  }

  .status-matrix dt {
    font-size: 0.58rem;
  }

  .status-matrix dd {
    font-size: 0.67rem;
  }

  .section {
    display: grid;
    grid-template-columns: 1fr;
    column-gap: 0;
    padding: 38px 0 40px;
  }

  .section-index-desktop,
  .kicker-desktop {
    display: none;
  }

  .section-heading,
  .copy-grid,
  .gateway-grid,
  .flow,
  .architecture-notes,
  .notice-box {
    grid-column: 1;
    width: 100%;
  }

  .section-heading {
    margin-bottom: 22px;
  }

  .section-mobile-head {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 7px;
    font-family: var(--mono);
  }

  .section-mobile-index {
    flex: 0 0 auto;
    color: var(--dim);
    font-size: 0.66rem;
    letter-spacing: 0.08em;
  }

  .section-mobile-head .kicker {
    font-size: 0.66rem;
  }

  .section-heading h2 {
    margin-top: 0;
    font-size: clamp(1.55rem, 8vw, 2rem);
  }

  .copy-grid,
  .gateway-grid,
  .architecture-notes {
    gap: 26px;
  }

  .prose {
    width: 100%;
    max-width: none;
  }

  .prose p {
    line-height: 1.78;
  }

  .tech-table > div,
  .tech-table.compact > div {
    grid-template-columns: 1fr;
    gap: 3px;
    padding: 10px 0 11px;
  }

  .capability-grid > div {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px;
    padding: 11px 0;
  }

  .capability-grid dd {
    padding-left: 13px;
    text-align: right;
    white-space: nowrap;
  }

  .flow {
    margin-top: 2px;
    margin-bottom: 28px;
  }

  .notice-box {
    padding: 19px 18px 18px;
  }

  .footer {
    width: 100%;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}