:root {
  --bg: #07131c;
  --bg-raise: #10202c;
  --text: #edf3f7;
  --muted: #c5d3dc;
  --paper: #f3f6f7;
  --paper-raised: #ffffff;
  --ink: #10202b;
  --ink-soft: #3a4f5e;
  --link: #0b5c64;
  --link-dark: #d5fffb;
  --badge-bg: #12383c;
  --badge-text: #f3fffd;
  --line: #1d4e53;
  --focus: #f4b942;
}

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

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "IBM Plex Sans", "Noto Sans SC", "PingFang SC", "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus {
  outline: none;
}

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

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 5;
  background: var(--paper);
  color: var(--ink);
  padding: 0.6rem 0.9rem;
}

.skip:focus {
  top: 0.6rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 4;
  background: rgba(7, 19, 28, 0.96);
  border-bottom: 1px solid rgba(213, 255, 251, 0.16);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  min-height: 4.25rem;
}

.brand {
  text-decoration: none;
}

.brand-mark {
  display: inline-block;
  font-weight: 600;
  letter-spacing: 0.22em;
  font-size: 0.92rem;
  line-height: 1;
  padding-bottom: 0.28rem;
  border-bottom: 1px solid var(--link-dark);
}

.nav-wrap {
  position: relative;
}

.nav-toggle {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.nav-toggle-label {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.9rem;
  cursor: pointer;
  border: 1px solid rgba(213, 255, 251, 0.4);
  letter-spacing: 0.08em;
  font-size: 0.85rem;
}

.nav-toggle:focus-visible + .nav-toggle-label {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.menu-panel {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.4rem 0 1rem;
}

.nav-toggle:checked ~ .menu-panel {
  display: flex;
  position: absolute;
  right: 0;
  top: calc(100% + 0.45rem);
  z-index: 6;
  width: min(20rem, calc(100vw - 2rem));
  padding: 0.35rem 0.9rem 0.7rem;
  background: var(--bg-raise);
  border: 1px solid rgba(213, 255, 251, 0.28);
}

.menu-panel a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0.2rem 0.15rem;
  text-decoration: none;
  color: var(--text);
}

.menu-panel a[aria-current="page"] {
  color: var(--link-dark);
  box-shadow: inset 0 -1px 0 var(--link-dark);
}

.lang-link {
  letter-spacing: 0.06em;
}

.home,
.band,
.site-footer {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.sheet-page {
  width: 100%;
}

.page-head {
  padding: 2.5rem 0 1rem;
}

.kicker {
  margin: 0 0 0.8rem;
  color: var(--link-dark);
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 5vw, 3.35rem);
  max-width: 14em;
}

.lead {
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.08rem;
}

.scope {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 0.75rem;
  align-items: center;
  max-width: 46rem;
  margin: 1.5rem 0 0;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(213, 255, 251, 0.28);
  background: rgba(18, 56, 60, 0.45);
}

.scope p {
  margin: 0;
  flex: 1 1 16rem;
  color: var(--text);
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 1.7rem;
  padding: 0.1rem 0.55rem;
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.badge-quiet {
  background: transparent;
  color: var(--link-dark);
  box-shadow: inset 0 0 0 1px rgba(213, 255, 251, 0.45);
}

.figure {
  margin: 0.5rem 0 2.5rem;
}

.figure figcaption,
.caption {
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 46rem;
}

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

.arch {
  border: 1px solid rgba(213, 255, 251, 0.22);
  padding: 1rem;
  background:
    linear-gradient(180deg, rgba(16, 32, 44, 0.2), rgba(16, 32, 44, 0.55));
}

.arch-head {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  margin-bottom: 0.9rem;
}

.arch-head span,
.stratum > span,
.reading span,
.timeline time {
  color: var(--link-dark);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
}

.arch-head h3,
.card h3,
.timeline h3,
.source-list h2,
.about-grid h2,
.contact h2 {
  margin: 0;
  font-size: 1.25rem;
}

.bench {
  display: grid;
  gap: 0.55rem;
  align-items: stretch;
}

.bench-pluggable,
.bench-npo,
.bench-cpo {
  grid-template-columns: minmax(0, 1fr) 3.4rem;
}

.bench-pluggable {
  grid-template-columns: minmax(0, 1fr) minmax(6rem, 1.3fr) minmax(0, 1fr) 3.2rem;
}

.node,
.region {
  border: 1px solid rgba(213, 255, 251, 0.5);
  padding: 0.75rem 0.8rem;
  min-height: 5.4rem;
  background: rgba(7, 19, 28, 0.35);
}

.node b,
.region b,
.stratum b {
  display: block;
  font-weight: 500;
}

.node small,
.region small,
.stratum small,
.node-choice li {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.trace,
.hop {
  position: relative;
  min-height: 2.4rem;
  background-image: repeating-linear-gradient(
    90deg,
    transparent 0 6px,
    rgba(213, 255, 251, 0.9) 6px 11px
  );
  background-size: auto 1px;
  background-repeat: no-repeat;
  background-position: center;
}

.trace span {
  position: absolute;
  left: 0.4rem;
  right: 0.4rem;
  top: 0.35rem;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.3;
}

.fiber {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 0.35rem;
  color: var(--link-dark);
  font-size: 0.75rem;
}

.fiber i {
  flex: 1;
  width: 1px;
  background: var(--link-dark);
  position: relative;
}

.fiber i::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 7px;
  height: 7px;
  border: 1px solid var(--link-dark);
  border-radius: 50%;
  transform: translate(-50%, 50%);
}

.substrate {
  border: 1px dashed rgba(213, 255, 251, 0.55);
  padding: 0.7rem;
}

.substrate-solid {
  border-style: solid;
}

.substrate-name {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.socket-row,
.die-row,
.mini-row {
  display: flex;
  gap: 0.45rem;
  align-items: stretch;
  width: 100%;
}

.socket-row .node,
.die-row .node {
  flex: 1;
}

.socket {
  width: 0.85rem;
  flex: 0 0 0.85rem;
  background: repeating-linear-gradient(
    135deg,
    rgba(213, 255, 251, 0.08) 0 4px,
    rgba(213, 255, 251, 0.85) 4px 5px
  );
}

.socket span {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.socket {
  position: relative;
}

.node-die {
  flex: 1;
}

.sheet,
.sheet-page .catalog,
.sheet-page .timeline,
.sheet-page .now-card,
.sheet-page .about-grid,
.sheet-page .denial,
.sheet-page .contact,
.sheet-page .source-list {
  background: var(--paper);
  color: var(--ink);
}

.sheet {
  width: 100%;
  margin-top: 1rem;
}

.sheet-inner,
.sheet-page .page-head,
.sheet-page .figure,
.sheet-page .catalog,
.sheet-page .timeline,
.sheet-page .now-card,
.sheet-page .about-grid,
.sheet-page .denial,
.sheet-page .contact,
.sheet-page .source-list {
  width: min(1120px, calc(100% - 2rem));
  margin-left: auto;
  margin-right: auto;
}

.sheet-page .page-head,
.sheet-page .figure {
  padding-left: 0;
  padding-right: 0;
}

.sheet-page .scope {
  background: #e7f3f3;
  border-color: #b7d4d4;
  color: var(--ink);
}

.sheet-page .scope p {
  color: var(--ink);
}

.sheet-page .scope .badge-quiet {
  color: var(--link);
  background: transparent;
  box-shadow: inset 0 0 0 1px var(--link);
}

.sheet-page .catalog .badge-quiet,
.sheet-page .now-card .badge-quiet,
.sheet .badge-quiet {
  color: var(--link);
  box-shadow: inset 0 0 0 1px var(--link);
}

.sheet-inner {
  padding: 2.2rem 0 2.6rem;
}

.sheet h2,
.band h2 {
  margin: 0 0 1rem;
  font-size: 1.6rem;
}

.band {
  padding: 0 0 3rem;
}

.catalog,
.about-grid,
.source-list,
.timeline,
.now-card,
.denial,
.contact {
  padding-left: 1.4rem;
  padding-right: 1.4rem;
}

.catalog,
.about-grid,
.source-list {
  padding-top: 0.4rem;
  padding-bottom: 2.2rem;
}

.entry-list .card,
.catalog .card,
.now-card {
  padding: 1.4rem 0;
  border-top: 1px solid #d3e0e4;
}

.card p,
.source-list p,
.about-grid p,
.contact p,
.timeline p {
  margin: 0.7rem 0 0;
  max-width: 44rem;
}

.card a {
  color: var(--link);
}

.varies span,
.sources-row span {
  display: inline-block;
  margin-right: 0.4rem;
  color: var(--link);
  letter-spacing: 0.04em;
  font-size: 0.82rem;
}

.sources-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.8rem;
  font-size: 0.92rem;
}

.sources-row a {
  color: var(--link);
}

.sources-row a + a::before {
  content: " · ";
  color: var(--ink-soft);
}

.reading {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}

.reading li {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0.8rem;
  max-width: 42rem;
}

.reading p {
  margin: 0;
}

.text-link {
  color: var(--link-dark);
}

.sheet .text-link,
.catalog .text-link,
.timeline .text-link,
.about-grid .text-link,
.source-list .text-link,
.contact .text-link,
.denial .text-link {
  color: var(--link);
}

.cta-row {
  margin-top: 1.4rem;
}

.strata {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

.stratum {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.8rem;
  padding: 0.9rem 1rem;
  border-left: 2px solid var(--link-dark);
  background: rgba(16, 32, 44, 0.55);
}

.chain,
.board {
  display: grid;
  gap: 0.7rem;
}

.node-choice {
  border-style: dashed;
}

.node-choice ul {
  margin: 0.45rem 0 0;
  padding: 0;
  list-style: none;
}

.tag {
  display: inline-block;
  margin-bottom: 0.35rem;
  color: var(--link-dark);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.region-optional {
  border-style: dashed;
}

.mini-row {
  margin-top: 0.7rem;
  align-items: center;
}

.mini-row i {
  flex: 0 0 1.4rem;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--link-dark) 0 4px, transparent 4px 7px);
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 1.5rem 0 0.5rem;
}

.timeline li {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 1rem;
  padding: 1.1rem 0;
  border-top: 1px solid #d3e0e4;
}

.timeline .sources-row a,
.about-grid a,
.source-list a {
  color: var(--link);
}

.now-card {
  padding-bottom: 2rem;
}

.about-grid {
  display: grid;
  gap: 1.4rem;
  padding-top: 0.4rem;
}

.denial {
  margin: 0;
  padding: 1rem 0 1.2rem;
  color: var(--ink-soft);
}

.contact {
  margin: 0;
  padding: 0 0 2.5rem;
  border-top: 1px solid #d3e0e4;
}

.contact h2 {
  padding-top: 1.2rem;
}

.source-list {
  list-style: none;
  margin: 0;
  padding: 0.5rem 0 2.5rem;
}

.source-list li {
  padding: 1.2rem 0;
  border-top: 1px solid #d3e0e4;
}

.source-meta {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.site-footer {
  padding: 2rem 0 2.6rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
  margin-bottom: 1rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.2rem;
}

.site-footer a {
  color: var(--text);
}

.colophon {
  max-width: 42rem;
}

@media (min-width: 900px) {
  .nav-toggle,
  .nav-toggle-label {
    display: none;
  }

  .menu-panel,
  .nav-toggle:checked ~ .menu-panel {
    display: flex;
    position: static;
    width: auto;
    padding: 0;
    background: transparent;
    border: 0;
    flex-direction: row;
    align-items: center;
    gap: 0.15rem 1.1rem;
  }

  .compare {
    grid-template-columns: none;
  }

  .chain {
    grid-template-columns: 1.15fr auto 1fr auto 1fr auto 1.25fr auto 1fr;
    align-items: stretch;
  }

  .hop {
    min-width: 1.2rem;
  }

  .board {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

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

  .reading li {
    grid-template-columns: 2rem 1fr;
    align-items: start;
  }
}

@media (max-width: 720px) {
  .bench-pluggable,
  .bench-npo,
  .bench-cpo,
  .socket-row,
  .die-row {
    grid-template-columns: 1fr;
    display: grid;
  }

  .socket {
    width: auto;
    height: 0.7rem;
    flex-basis: auto;
  }

  .trace {
    min-height: 2.8rem;
  }

  .timeline li {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  h1 {
    font-size: 2rem;
  }
}

@media (forced-colors: active) {
  .node,
  .region,
  .substrate,
  .badge,
  .arch {
    border: 1px solid CanvasText;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("/fonts/ibm-plex-sans-latin-500-normal.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("/fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2");
}
@font-face {
  font-family: "Noto Sans SC";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/noto-sans-sc-chinese-simplified-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "Noto Sans SC";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("/fonts/noto-sans-sc-chinese-simplified-500-normal.woff2") format("woff2");
}