:root {
  --color-bg: #F4E9CF;
  --color-panel: #FFF8E8;
  --color-panel-alt: #E8D8B7;
  --color-border: #191712;
  --color-accent: #E23D2D;
  --color-accent-dark: #A9251D;
  --color-text: #191712;
  --color-muted: #665E50;
  --color-success: #176B45;
  --color-warn: #F2C72E;
  --color-error: #B6241C;
  --color-paper-ink: rgba(25, 23, 18, 0.06);
  --color-grid: rgba(25, 23, 18, 0.10);
  --color-accent-wash: rgba(226, 61, 45, 0.14);
  --color-success-wash: rgba(23, 107, 69, 0.14);
  --color-light-ink: rgba(255, 248, 232, 0.94);
  --color-overlay: rgba(25, 23, 18, 0.68);
  --color-transparent: transparent;

  --font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  --radius-none: 0;
  --radius-small: 4px;
  --radius-pill: 999px;
  --border-heavy: 4px;
  --border-medium: 2px;
  --page-width: 1360px;
  --content-width: 1120px;
  --gutter: clamp(16px, 3vw, 28px);
  --section-space: clamp(68px, 8vw, 112px);
  --header-height: 82px;
  --transition-fast: 160ms ease;
  --transition-medium: 420ms ease;
}

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

html {
  min-width: 0;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-body);
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 0;
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 17% 24%, var(--color-paper-ink) 0 0.7px, var(--color-transparent) 0.9px),
    radial-gradient(circle at 72% 68%, var(--color-paper-ink) 0 0.6px, var(--color-transparent) 0.8px);
  background-size: 11px 13px, 17px 19px;
  font-size: 16px;
  line-height: 1.75;
}

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

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

img {
  height: auto;
}

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

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

button {
  cursor: pointer;
}

a {
  color: var(--color-accent-dark);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.2em;
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: var(--border-heavy) solid var(--color-success);
  outline-offset: 3px;
}

p,
ul,
ol,
dl,
blockquote,
pre,
table {
  margin-top: 0;
  margin-bottom: 1.25em;
}

ul,
ol {
  padding-left: 1.35em;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.14;
  overflow-wrap: anywhere;
}

h1 {
  font-size: clamp(48px, 6.2vw, 78px);
  letter-spacing: -0.065em;
}

h2 {
  margin-bottom: 0.55em;
  font-size: clamp(34px, 4.5vw, 54px);
  letter-spacing: -0.045em;
}

h3 {
  margin-bottom: 0.55em;
  font-size: clamp(23px, 2.5vw, 30px);
  letter-spacing: -0.025em;
}

h4 {
  margin-bottom: 0.45em;
  font-size: 19px;
}

strong {
  font-weight: 900;
}

small {
  font-size: 0.82rem;
}

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

code {
  overflow-wrap: anywhere;
}

:not(pre) > code {
  padding: 0.12em 0.35em;
  border: var(--border-medium) solid var(--color-border);
  background: var(--color-panel-alt);
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: var(--border-heavy) solid var(--color-border);
  border-radius: var(--radius-small);
  color: var(--color-light-ink);
  background: var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.7;
  tab-size: 2;
  white-space: pre;
}

pre code {
  overflow-wrap: normal;
}

hr {
  height: var(--border-medium);
  margin: 48px 0;
  border: 0;
  background: var(--color-border);
}

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

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

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

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

.section-tight {
  padding-top: clamp(40px, 5vw, 68px);
  padding-bottom: clamp(40px, 5vw, 68px);
  overflow-x: clip;
}

.section-heading {
  max-width: 820px;
  margin-bottom: clamp(30px, 4vw, 54px);
}

.section-heading p {
  max-width: 700px;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 1.08rem;
}

.kicker,
.mono-label {
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.button {
  min-height: 52px;
  max-width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 8px 20px;
  border: var(--border-heavy) solid var(--color-border);
  border-radius: var(--radius-small);
  color: var(--color-text);
  background: var(--color-panel);
  font-size: 15px;
  font-weight: 900;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.button:hover {
  color: var(--color-text);
  transform: translate(-2px, -2px);
}

.button svg,
.button img,
.icon-fixed {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
}

.button-primary {
  color: var(--color-panel);
  background: var(--color-accent);
}

.button-primary:hover {
  color: var(--color-panel);
  background: var(--color-accent-dark);
}

.button-secondary {
  background: var(--color-bg);
}

.button-success {
  color: var(--color-panel);
  background: var(--color-success);
}

.button[aria-disabled="true"],
.button:disabled {
  cursor: not-allowed;
  color: var(--color-muted);
  background: var(--color-panel-alt);
  opacity: 0.68;
  transform: none;
}

.card,
.paper-panel,
.paper-panel-alt {
  position: relative;
  min-width: 0;
  padding: clamp(22px, 3vw, 34px);
  border: var(--border-heavy) solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-panel);
}

.paper-panel-alt {
  background: var(--color-panel-alt);
}

.card > :last-child,
.paper-panel > :last-child,
.paper-panel-alt > :last-child {
  margin-bottom: 0;
}

.ink-offset {
  isolation: isolate;
}

.ink-offset::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 7px -9px -9px 7px;
  border: var(--border-heavy) solid var(--color-border);
  background: var(--color-accent);
  pointer-events: none;
}

.ink-offset-green::after {
  background: var(--color-success);
}

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

.badge,
.chip {
  max-width: 100%;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  padding: 6px 10px;
  border: var(--border-medium) solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text);
  background: var(--color-panel-alt);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  line-height: 1.2;
  white-space: nowrap;
}

.badge-dot,
.status-dot {
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  border: var(--border-medium) solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-success);
}

.badge-accent {
  color: var(--color-panel);
  background: var(--color-accent);
}

.badge-success {
  color: var(--color-panel);
  background: var(--color-success);
}

.badge-warn {
  background: var(--color-warn);
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: var(--border-heavy) solid var(--color-border);
  overscroll-behavior-inline: contain;
}

.data-table {
  width: 100%;
  min-width: 680px;
  margin: 0;
  border-collapse: collapse;
  background: var(--color-panel);
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  border-right: var(--border-medium) solid var(--color-border);
  border-bottom: var(--border-medium) solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: var(--color-panel-alt);
  font-family: var(--font-display);
  font-weight: 900;
}

.data-table th:last-child,
.data-table td:last-child {
  border-right: 0;
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.prose {
  max-width: 820px;
  font-size: 1.04rem;
}

.prose h2 {
  margin-top: 2.1em;
  padding-bottom: 0.28em;
  border-bottom: var(--border-heavy) solid var(--color-border);
}

.prose h3 {
  margin-top: 1.7em;
}

.prose a {
  font-weight: 700;
}

.prose img {
  margin: 30px auto;
  border: var(--border-heavy) solid var(--color-border);
}

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

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

.site-header {
  position: relative;
  z-index: 50;
  height: var(--header-height);
  border-bottom: var(--border-heavy) solid var(--color-border);
  background: var(--color-panel);
}

.header-inner {
  position: relative;
  width: 100%;
  max-width: calc(var(--page-width) + (var(--gutter) * 2));
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: stretch;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding-right: 28px;
  border-right: var(--border-medium) solid var(--color-border);
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.03em;
  text-decoration: none;
  white-space: nowrap;
}

.site-brand:hover {
  color: var(--color-text);
}

.brand-logo {
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
}

.desktop-nav {
  display: flex;
  align-items: stretch;
  margin-left: auto;
}

.desktop-nav a {
  position: relative;
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 0 14px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.desktop-nav a::after {
  content: "";
  position: absolute;
  right: 12px;
  bottom: 0;
  left: 12px;
  height: 5px;
  background: var(--color-accent);
  opacity: 0;
  transform: scaleX(0.35);
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast);
}

.desktop-nav a:hover,
.desktop-nav a[aria-current="page"] {
  color: var(--color-text);
}

.desktop-nav a:hover::after,
.desktop-nav a[aria-current="page"]::after {
  opacity: 1;
  transform: scaleX(1);
}

.header-tools {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 12px;
}

.language-control {
  position: relative;
}

.language-button,
.menu-toggle {
  min-height: 44px;
  border: var(--border-medium) solid var(--color-border);
  border-radius: var(--radius-small);
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 13px;
  font-weight: 900;
}

.language-button {
  padding: 8px 12px;
  white-space: nowrap;
}

.language-menu {
  position: absolute;
  z-index: 80;
  top: calc(100% + 9px);
  right: 0;
  width: 164px;
  padding: 6px;
  border: var(--border-heavy) solid var(--color-border);
  background: var(--color-panel);
}

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

.language-menu a {
  min-height: 42px;
  display: flex;
  align-items: center;
  width: 100%;
  padding: 8px 10px;
  color: var(--color-text);
  font-weight: 750;
  text-decoration: none;
}

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

.menu-toggle {
  min-width: 44px;
  padding: 8px;
  display: none;
  place-items: center;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  width: 22px;
  height: var(--border-medium);
  display: block;
  background: var(--color-border);
}

.menu-toggle-lines {
  position: relative;
}

.menu-toggle-lines::before,
.menu-toggle-lines::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-toggle-lines::before {
  top: -7px;
}

.menu-toggle-lines::after {
  top: 7px;
}

.mobile-nav {
  display: none;
}

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

.site-footer {
  overflow-x: clip;
  border-top: var(--border-heavy) solid var(--color-border);
  color: var(--color-light-ink);
  background: var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.9fr 1.2fr 0.85fr;
  gap: 36px;
  padding-top: 58px;
  padding-bottom: 48px;
}

.footer-brand {
  color: var(--color-light-ink);
}

.footer-brand-line {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 900;
}

.footer-logo {
  width: 48px;
  height: 48px;
  flex: 0 0 auto;
}

.footer-brand p {
  max-width: 330px;
  color: var(--color-light-ink);
  opacity: 0.78;
}

.footer-heading {
  margin-bottom: 14px;
  color: var(--color-light-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.footer-links {
  display: grid;
  gap: 7px;
}

.footer-links a {
  width: fit-content;
  max-width: 100%;
  color: var(--color-light-ink);
  font-size: 0.92rem;
  text-decoration: none;
  opacity: 0.8;
}

.footer-links a:hover {
  color: var(--color-warn);
  opacity: 1;
}

.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-keywords a {
  max-width: 100%;
  overflow: hidden;
  padding: 5px 8px;
  border: var(--border-medium) solid var(--color-panel-alt);
  color: var(--color-light-ink);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
}

.footer-keywords a:hover {
  color: var(--color-border);
  background: var(--color-warn);
}

.footer-bottom {
  min-height: 62px;
  border-top: var(--border-medium) solid var(--color-muted);
}

.footer-bottom-inner {
  min-height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--color-light-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  opacity: 0.78;
}

.footer-bottom a {
  color: var(--color-light-ink);
}

@media (max-width: 1220px) {
  .desktop-nav a {
    padding-inline: 9px;
    font-size: 13px;
  }

  .site-brand {
    padding-right: 18px;
    font-size: 18px;
  }
}

@media (max-width: 1040px) {
  :root {
    --header-height: 72px;
  }

  .desktop-nav {
    display: none;
  }

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

  .menu-toggle {
    display: grid;
  }

  .language-control {
    display: none;
  }

  .mobile-nav-veil {
    position: fixed;
    z-index: 40;
    inset: var(--header-height) 0 0;
    border: 0;
    background: var(--color-overlay);
  }

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

  .mobile-nav {
    position: absolute;
    z-index: 70;
    top: 100%;
    right: var(--gutter);
    left: var(--gutter);
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    border: var(--border-heavy) solid var(--color-border);
    background: var(--color-panel);
  }

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

  .mobile-nav a {
    min-height: 48px;
    width: 100%;
    display: flex;
    align-items: center;
    padding: 11px 16px;
    border-bottom: var(--border-medium) solid var(--color-border);
    color: var(--color-text);
    font-weight: 850;
    text-decoration: none;
  }

  .mobile-nav a:last-child {
    border-bottom: 0;
  }

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

  .mobile-language-title {
    padding: 10px 16px;
    border-bottom: var(--border-medium) solid var(--color-border);
    color: var(--color-muted);
    background: var(--color-panel-alt);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 900;
    letter-spacing: 0.08em;
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --section-space: 64px;
  }

  body {
    font-size: 15px;
  }

  h1 {
    font-size: clamp(42px, 14vw, 60px);
  }

  h2 {
    font-size: clamp(31px, 10vw, 42px);
  }

  .site-brand {
    gap: 9px;
    padding-right: 0;
    border-right: 0;
    font-size: 16px;
  }

  .brand-logo {
    width: 40px;
    height: 40px;
  }

  .button-row,
  .button {
    width: 100%;
  }

  .tilt {
    transform: none;
  }

  .ink-offset::after {
    inset: 6px -6px -6px 6px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-bottom-inner {
    padding-top: 15px;
    padding-bottom: 15px;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
  }

  .data-table {
    font-size: 0.88rem;
  }
}

@media (max-width: 360px) {
  .site-brand span:last-child {
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

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

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

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