:root {
  --color-desktop: #008080;
  --color-desktop-dark: #006D6D;
  --color-desktop-light: #078989;
  --color-panel: #C0C0C0;
  --color-panel-soft: #DFDFDF;
  --color-panel-bright: #FFFFFF;
  --color-panel-shadow: #808080;
  --color-border: #404040;
  --color-accent: #0000AA;
  --color-accent-dark: #000080;
  --color-accent-light: #1B32C7;
  --color-text: #000000;
  --color-text-muted: #3F3F3F;
  --color-success: #087E00;
  --color-warning: #9A5700;
  --color-error: #A00000;
  --color-paper: #FFFCE6;
  --color-shadow: #003C3C;
  --color-shadow-deep: #002929;
  --color-selection-text: #FFFFFF;
  --color-transparent: transparent;
  --color-overlay: rgb(0 41 41 / 72%);

  --font-display: "JetBrains Mono", "Noto Sans SC", SimSun, monospace;
  --font-body: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", Consolas, "Courier New", monospace;

  --radius-none: 0;
  --border-raised: 2px;
  --border-strong: 3px;
  --header-height: 72px;
  --page-width: 1344px;
  --content-width: 1120px;
  --reading-width: 820px;
  --gutter: clamp(16px, 4vw, 32px);
  --space-section: clamp(56px, 8vw, 104px);
  --hard-shadow-small: 3px 3px 0 var(--color-shadow);
  --hard-shadow-medium: 7px 7px 0 var(--color-shadow);
  --hard-shadow-large: 13px 13px 0 var(--color-shadow-deep);
  --transition-fast: 130ms steps(2, end);
  --transition-reveal: 520ms ease;
}

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

html {
  width: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 18px);
}

html.nav-open {
  overflow: hidden;
}

body {
  width: 100%;
  min-width: 0;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background-color: var(--color-desktop);
  background-image:
    repeating-linear-gradient(
      0deg,
      var(--color-transparent) 0,
      var(--color-transparent) 3px,
      var(--color-desktop-dark) 4px
    ),
    repeating-linear-gradient(
      90deg,
      var(--color-transparent) 0,
      var(--color-transparent) 7px,
      var(--color-desktop-light) 8px
    );
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}

main,
section,
article,
aside,
header,
footer,
nav,
div {
  min-width: 0;
}

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

img {
  height: auto;
}

a {
  color: inherit;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

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

button,
select {
  border-radius: var(--radius-none);
}

button,
a {
  -webkit-tap-highlight-color: var(--color-transparent);
}

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

:not(pre) > code {
  padding: 0.1em 0.32em;
  overflow-wrap: anywhere;
  color: var(--color-accent-dark);
  background: var(--color-panel-soft);
  border: 1px solid var(--color-panel-shadow);
}

pre {
  max-width: 100%;
  margin: 1.4rem 0;
  padding: 18px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  color: var(--color-panel-bright);
  background: var(--color-accent-dark);
  border-top: 3px solid var(--color-accent-light);
  border-left: 3px solid var(--color-accent-light);
  border-right: 3px solid var(--color-shadow-deep);
  border-bottom: 3px solid var(--color-shadow-deep);
  box-shadow: var(--hard-shadow-small);
  line-height: 1.65;
}

pre code {
  display: block;
  min-width: max-content;
  padding: 0;
  color: inherit;
  background: none;
  border: 0;
  overflow-wrap: normal;
}

table {
  border-collapse: collapse;
}

th,
td {
  padding: 12px 14px;
  border: 2px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--color-selection-text);
  background: var(--color-accent-dark);
  font-family: var(--font-display);
}

::selection {
  color: var(--color-selection-text);
  background: var(--color-accent);
}

:focus-visible {
  outline: 2px dashed var(--color-text);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: calc(var(--page-width) + (var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--content {
  max-width: calc(var(--content-width) + (var(--gutter) * 2));
}

.wrap--reading {
  max-width: calc(var(--reading-width) + (var(--gutter) * 2));
}

.section {
  padding-top: var(--space-section);
  padding-bottom: var(--space-section);
}

.section--panel {
  background: var(--color-panel-soft);
  border-top: 3px solid var(--color-panel-bright);
  border-bottom: 3px solid var(--color-border);
}

.overflow-guard,
.hero,
.preview-hero,
.decorated-section {
  overflow-x: clip;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  line-height: 1.16;
}

h1 {
  margin: 0 0 1.3rem;
  font-size: clamp(48px, 6.4vw, 82px);
  font-weight: 900;
  letter-spacing: -0.075em;
}

h2 {
  margin: 0 0 1.25rem;
  font-size: clamp(30px, 4vw, 46px);
  letter-spacing: -0.045em;
}

h3 {
  margin: 1.8rem 0 0.8rem;
  font-size: clamp(21px, 2.4vw, 28px);
}

p {
  margin: 0 0 1.15rem;
}

.lead {
  max-width: 720px;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.8;
}

.eyebrow {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 6px 9px;
  overflow: hidden;
  color: var(--color-text);
  background: var(--color-panel);
  border-top: 2px solid var(--color-panel-bright);
  border-left: 2px solid var(--color-panel-bright);
  border-right: 2px solid var(--color-border);
  border-bottom: 2px solid var(--color-border);
  box-shadow: var(--hard-shadow-small);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
}

.status-dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  background: var(--color-success);
  border: 2px solid var(--color-text);
  box-shadow: 1px 1px 0 var(--color-panel-bright);
}

.system-button,
.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  color: var(--color-text);
  background: var(--color-panel);
  border-top: 3px solid var(--color-panel-bright);
  border-left: 3px solid var(--color-panel-bright);
  border-right: 3px solid var(--color-border);
  border-bottom: 3px solid var(--color-border);
  box-shadow: 4px 4px 0 var(--color-shadow-deep);
  font-size: 15px;
  font-weight: 900;
  line-height: 1.3;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.system-button:hover,
.button:hover {
  background: var(--color-panel-soft);
}

.system-button:active,
.button:active {
  transform: translate(3px, 3px);
  box-shadow: 1px 1px 0 var(--color-shadow-deep);
}

.system-button--primary,
.button--primary {
  color: var(--color-selection-text);
  background: var(--color-accent);
  border-top-color: var(--color-accent-light);
  border-left-color: var(--color-accent-light);
  border-right-color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent-dark);
}

.system-button--primary:hover,
.button--primary:hover {
  background: var(--color-accent-light);
}

.system-button[disabled],
.button[disabled] {
  color: var(--color-text-muted);
  background: var(--color-panel);
  box-shadow: none;
  cursor: not-allowed;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.panel,
.card {
  min-width: 0;
  padding: clamp(18px, 3vw, 28px);
  background: var(--color-panel-soft);
  border-top: 3px solid var(--color-panel-bright);
  border-left: 3px solid var(--color-panel-bright);
  border-right: 3px solid var(--color-border);
  border-bottom: 3px solid var(--color-border);
  box-shadow: var(--hard-shadow-medium);
}

.panel__titlebar {
  margin: calc(clamp(18px, 3vw, 28px) * -1);
  margin-bottom: 22px;
  padding: 7px 10px;
  color: var(--color-selection-text);
  background: var(--color-accent-dark);
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.3;
}

.grid {
  display: grid;
  gap: 24px;
}

.grid > * {
  min-width: 0;
}

.grid--two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag,
.badge {
  display: inline-flex;
  max-width: 100%;
  min-height: 26px;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  overflow: hidden;
  color: var(--color-selection-text);
  background: var(--color-accent-dark);
  border: 1px solid var(--color-panel-bright);
  box-shadow: 2px 2px 0 var(--color-shadow-deep);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  line-height: 1.35;
}

.site-header {
  position: relative;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-panel);
  border-top: var(--border-raised) solid var(--color-panel-bright);
  border-left: var(--border-raised) solid var(--color-panel-bright);
  border-right: var(--border-raised) solid var(--color-border);
  border-bottom: var(--border-strong) solid var(--color-border);
  box-shadow: 0 4px 0 var(--color-shadow);
}

.nav-shell {
  width: 100%;
  max-width: calc(var(--page-width) + (var(--gutter) * 2));
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 11px;
  flex: 0 1 auto;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.04em;
  text-decoration: none;
}

.brand img {
  width: 43px;
  height: 39px;
  flex: 0 0 auto;
  filter: drop-shadow(2px 2px 0 var(--color-panel-bright));
}

.main-nav {
  display: flex;
  height: 100%;
  align-items: stretch;
  justify-content: flex-end;
  gap: clamp(15px, 2vw, 29px);
  margin-left: auto;
}

.main-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
}

.main-nav a[aria-current="page"] {
  color: var(--color-accent-dark);
  font-weight: 900;
}

.main-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 12px;
  left: 0;
  height: 3px;
  background: var(--color-accent);
  box-shadow: 2px 2px 0 var(--color-panel-shadow);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
}

.language-picker {
  position: relative;
}

.language-button {
  min-width: 126px;
  min-height: 40px;
  padding: 7px 10px;
  color: var(--color-text);
  background: var(--color-panel);
  border-top: 2px solid var(--color-panel-bright);
  border-left: 2px solid var(--color-panel-bright);
  border-right: 2px solid var(--color-border);
  border-bottom: 2px solid var(--color-border);
  box-shadow: 2px 2px 0 var(--color-panel-shadow);
  font-size: 13px;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.language-menu {
  position: absolute;
  top: calc(100% + 7px);
  right: 0;
  z-index: 112;
  width: 180px;
  padding: 3px;
  background: var(--color-panel);
  border-top: 2px solid var(--color-panel-bright);
  border-left: 2px solid var(--color-panel-bright);
  border-right: 2px solid var(--color-border);
  border-bottom: 2px solid var(--color-border);
  box-shadow: var(--hard-shadow-small);
}

.language-menu[hidden] {
  display: none;
}

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 42px;
  align-items: center;
  padding: 8px 10px;
  text-decoration: none;
}

.language-menu a:hover,
.language-menu a[aria-current="true"] {
  color: var(--color-selection-text);
  background: var(--color-accent);
}

.nav-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 8px;
  place-items: center;
  background: var(--color-panel);
  border-top: 2px solid var(--color-panel-bright);
  border-left: 2px solid var(--color-panel-bright);
  border-right: 2px solid var(--color-border);
  border-bottom: 2px solid var(--color-border);
  cursor: pointer;
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 22px;
  height: 3px;
  background: var(--color-text);
}

.nav-toggle__bars {
  position: relative;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__bars::before {
  top: -7px;
}

.nav-toggle__bars::after {
  top: 7px;
}

.mobile-nav {
  display: none;
}

.mobile-nav-veil {
  display: none;
}

.site-footer {
  color: var(--color-text);
  background: var(--color-panel);
  border-top: 4px solid var(--color-panel-bright);
  box-shadow: 0 -5px 0 var(--color-shadow);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.3fr 0.8fr;
  gap: clamp(24px, 4vw, 52px);
  padding-top: 56px;
  padding-bottom: 42px;
}

.footer-brand p {
  max-width: 350px;
  color: var(--color-text-muted);
}

.footer-heading {
  margin: 0 0 13px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 900;
}

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

.footer-links li + li {
  margin-top: 6px;
}

.footer-links a {
  overflow-wrap: anywhere;
}

.footer-links a:hover {
  color: var(--color-accent-dark);
}

.footer-bottom {
  padding-top: 16px;
  padding-bottom: 18px;
  border-top: 2px solid var(--color-panel-shadow);
  font-family: var(--font-mono);
  font-size: 12px;
}

.prose {
  overflow-wrap: break-word;
}

.prose > * {
  max-width: 100%;
}

.prose h2 {
  margin-top: 2.8rem;
  padding-bottom: 10px;
  border-bottom: 4px double var(--color-border);
}

.prose h3 {
  color: var(--color-accent-dark);
}

.prose a {
  color: var(--color-accent-dark);
  font-weight: 700;
}

.prose ul,
.prose ol {
  padding-left: 1.45rem;
}

.table-wrap {
  max-width: 100%;
  margin: 1.5rem 0;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
}

.data-table {
  width: 100%;
  min-width: 680px;
  background: var(--color-panel-bright);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--transition-reveal),
    transform var(--transition-reveal);
}

.reveal.shown {
  opacity: 1;
  transform: none;
}

.tilt {
  transform: rotate(-0.45deg);
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (max-width: 1120px) {
  .main-nav {
    gap: 13px;
  }

  .main-nav a {
    font-size: 13px;
  }

  .brand span {
    display: none;
  }
}

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

  .site-header {
    height: var(--header-height);
  }

  .main-nav {
    display: none;
  }

  .header-tools {
    margin-left: auto;
  }

  .language-picker {
    display: none;
  }

  .nav-toggle {
    display: grid;
  }

  .mobile-nav-veil {
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: 90;
    background: var(--color-overlay);
  }

  .mobile-nav-veil.is-open {
    display: block;
  }

  .mobile-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    z-index: 110;
    display: none;
    width: min(360px, 100%);
    max-height: calc(100dvh - var(--header-height));
    padding: 8px;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--color-panel);
    border-left: 3px solid var(--color-panel-bright);
    border-bottom: 3px solid var(--color-border);
    box-shadow: -7px 7px 0 var(--color-shadow-deep);
  }

  .mobile-nav.is-open {
    display: block;
  }

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

  .mobile-nav__group + .mobile-nav__group {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 2px solid var(--color-panel-shadow);
  }

  .mobile-nav a {
    display: flex;
    width: 100%;
    min-height: 46px;
    align-items: center;
    padding: 10px 12px;
    text-decoration: none;
  }

  .mobile-nav a:hover,
  .mobile-nav a[aria-current="page"],
  .mobile-nav a[aria-current="true"] {
    color: var(--color-selection-text);
    background: var(--color-accent);
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --space-section: 52px;
  }

  body {
    font-size: 15px;
  }

  .wrap,
  .wrap--content,
  .wrap--reading {
    width: 100%;
    padding-inline: var(--gutter);
  }

  h1 {
    font-size: clamp(43px, 14vw, 60px);
  }

  h2 {
    font-size: clamp(28px, 9vw, 38px);
  }

  .grid--two,
  .grid--three,
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .panel,
  .card {
    padding: 18px;
    box-shadow: var(--hard-shadow-small);
  }

  .panel__titlebar {
    margin: -18px -18px 18px;
  }

  .button-row {
    align-items: stretch;
  }

  .button-row .button,
  .button-row .system-button {
    flex: 1 1 100%;
  }

  .brand span {
    display: inline;
    max-width: 148px;
    overflow: hidden;
    font-size: 14px;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .tilt,
  [class*="tilt"] {
    transform: none;
  }

  .table-wrap {
    width: 100%;
  }

  .prose > .data-table {
    display: block;
    max-width: 100%;
    min-width: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}