:root {
  --color-bg: #100C09;
  --color-panel: #1A130E;
  --color-panel-strong: #251A12;
  --color-border: #5A4430;
  --color-accent: #D7482F;
  --color-accent-dark: #A92E1D;
  --color-text: #F1E8D6;
  --color-muted: #AA9C88;
  --color-success: #7F9A75;
  --color-warn: #C39752;
  --color-error: #C75A4C;
  --color-lead: #706B63;
  --color-lead-dark: #403B35;
  --color-lead-light: #B9B0A1;
  --color-brass: #B88A42;
  --color-brass-dark: #6F5027;
  --color-brass-light: #D1AE69;
  --color-transparent: transparent;
  --font-display: "Songti SC", "STSong", "SimSun", serif;
  --font-body: "Songti SC", "STSong", "Noto Sans SC", "Microsoft YaHei", serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --radius-none: 0;
  --line-thin: 1px;
  --line-strong: 2px;
  --header-height: 76px;
  --content-max: 1440px;
  --reading-max: 820px;
  --gutter: clamp(16px, 4vw, 54px);
  --section-space: clamp(64px, 9vw, 124px);
  --transition-fast: 150ms ease;
  --transition-reveal: 620ms cubic-bezier(.2, .72, .2, 1);
}

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

html {
  min-width: 0;
  background: var(--color-bg);
  scroll-behavior: smooth;
  scrollbar-color: var(--color-border) var(--color-bg);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 0;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-body);
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body,
button,
input,
select,
textarea {
  font-family: var(--font-body);
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

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

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

figure,
blockquote {
  margin: 0;
}

table {
  border-collapse: collapse;
}

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

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

:not(pre) > code {
  padding: .08em .32em;
  border: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
  color: var(--color-text);
  font-size: .88em;
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  margin: 1.5rem 0;
  overflow-x: auto;
  padding: 20px;
  border: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
  color: var(--color-text);
  line-height: 1.65;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

pre code {
  padding: 0;
  border: 0;
  background: var(--color-transparent);
  white-space: pre;
  overflow-wrap: normal;
}

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

:focus-visible {
  outline: var(--line-strong) solid var(--color-accent);
  outline-offset: 4px;
}

.wrap {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

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

.section--panel {
  background: var(--color-panel);
  border-block: var(--line-thin) solid var(--color-border);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, .48fr);
  gap: clamp(28px, 6vw, 84px);
  align-items: end;
  margin-bottom: clamp(34px, 5vw, 62px);
}

.section-kicker {
  margin: 0 0 12px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .13em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4 {
  color: var(--color-text);
  font-family: var(--font-display);
  text-wrap: balance;
}

h1 {
  margin: 0;
  font-size: clamp(52px, 6.2vw, 82px);
  line-height: 1.04;
  letter-spacing: -.055em;
}

h2 {
  margin: 0;
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1.15;
  letter-spacing: -.035em;
}

h3 {
  margin: 0;
  font-size: clamp(23px, 2.3vw, 31px);
  line-height: 1.3;
}

h4 {
  margin: 0;
  font-size: 20px;
}

p {
  margin: 0 0 1.2em;
}

.lead {
  max-width: 760px;
  color: var(--color-muted);
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.85;
}

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

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

.accent-text {
  color: var(--color-accent);
}

.rule-label {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 10px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.rule-label::before,
.status-dot {
  flex-shrink: 0;
}

.rule-label::before {
  width: 30px;
  height: var(--line-strong);
  background: var(--color-accent);
  content: "";
}

.btn {
  display: inline-flex;
  min-height: 48px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 11px;
  padding: 10px 22px;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-none);
  background: var(--color-panel);
  color: var(--color-text);
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .035em;
  line-height: 1.3;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.btn:hover {
  border-color: var(--color-muted);
  background: var(--color-panel-strong);
}

.btn--primary {
  border-color: var(--color-accent);
  background: var(--color-accent);
  font-weight: 700;
}

.btn--primary:hover,
.btn--primary:active {
  border-color: var(--color-accent-dark);
  background: var(--color-accent-dark);
}

.btn--quiet {
  background: var(--color-transparent);
}

.btn[disabled],
.btn.is-disabled {
  border-color: var(--color-border);
  background: var(--color-panel);
  color: var(--color-muted);
  cursor: not-allowed;
  opacity: .55;
}

.btn svg,
.icon-box,
.status-dot {
  flex-shrink: 0;
}

.btn svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
}

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

.panel,
.card {
  min-width: 0;
  border: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
}

.panel {
  padding: clamp(22px, 4vw, 42px);
}

.card {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
}

.card::before {
  position: absolute;
  top: -1px;
  left: 22px;
  width: 36px;
  height: var(--line-strong);
  background: var(--color-accent);
  content: "";
}

.card:hover {
  background: var(--color-panel-strong);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--line-thin);
  border: var(--line-thin) solid var(--color-border);
  background: var(--color-border);
}

.card-grid > * {
  min-width: 0;
  border: 0;
  background: var(--color-panel);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.chip {
  display: inline-flex;
  min-height: 28px;
  max-width: 100%;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  padding: 4px 10px;
  border: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .04em;
  white-space: nowrap;
}

.chip::before {
  width: 5px;
  height: 5px;
  flex-shrink: 0;
  background: var(--color-success);
  content: "";
}

.data-table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: var(--line-thin) solid var(--color-border);
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  min-width: 620px;
  background: var(--color-panel);
  text-align: left;
}

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

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

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

.data-table th {
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
}

.data-table td {
  color: var(--color-muted);
}

.prose {
  min-width: 0;
  color: var(--color-muted);
  font-size: 17px;
}

.prose h2 {
  margin-top: 2.2em;
  margin-bottom: .7em;
  padding-top: .5em;
  border-top: var(--line-thin) solid var(--color-border);
}

.prose h3 {
  margin-top: 1.8em;
  margin-bottom: .65em;
}

.prose h4 {
  margin-top: 1.5em;
  margin-bottom: .55em;
}

.prose p,
.prose li {
  overflow-wrap: break-word;
}

.prose strong {
  color: var(--color-text);
}

.prose a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}

.prose li + li {
  margin-top: .45em;
}

.prose img {
  height: auto;
  margin: 1.5rem auto;
  border: var(--line-thin) solid var(--color-border);
}

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

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

#site-header {
  position: relative;
  z-index: 100;
  display: block;
  min-height: var(--header-height);
}

.site-header-bar {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: minmax(260px, 1fr) auto auto;
  align-items: center;
  min-height: var(--header-height);
  padding-inline: var(--gutter);
  border-bottom: var(--line-thin) solid var(--color-border);
  background: var(--color-bg);
}

.site-brand {
  display: inline-flex;
  width: max-content;
  max-width: 100%;
  align-items: center;
  gap: 13px;
}

.site-brand img {
  width: 35px;
  height: 35px;
  flex-shrink: 0;
}

.site-brand-copy {
  display: flex;
  min-width: 0;
  align-items: baseline;
  gap: 9px;
  white-space: nowrap;
}

.site-brand-name {
  overflow: hidden;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .08em;
  text-overflow: ellipsis;
}

.site-brand-register {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .12em;
}

.desktop-nav {
  display: flex;
  height: var(--header-height);
  align-items: stretch;
  gap: 34px;
  margin-right: 34px;
}

.desktop-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  color: var(--color-muted);
  font-size: 15px;
  letter-spacing: .05em;
}

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

.desktop-nav a[aria-current="page"]::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: var(--line-strong);
  background: var(--color-accent);
  content: "";
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.language-control {
  position: relative;
}

.language-toggle {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 0 0 18px;
  border: 0;
  border-left: var(--line-thin) solid var(--color-border);
  background: var(--color-transparent);
  color: var(--color-muted);
  cursor: pointer;
  font-size: 13px;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  display: none;
  width: 178px;
  padding: 6px;
  border: var(--line-thin) solid var(--color-border);
  background: var(--color-panel-strong);
}

.language-control.is-open .language-menu {
  display: block;
}

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 8px 12px;
  color: var(--color-muted);
}

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

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
  border: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
  cursor: pointer;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  display: block;
  width: 20px;
  height: var(--line-thin);
  background: var(--color-text);
}

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

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

.menu-toggle-lines::before {
  top: -6px;
}

.menu-toggle-lines::after {
  top: 6px;
}

.mobile-nav {
  position: absolute;
  z-index: 4;
  top: 100%;
  right: 0;
  left: 0;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  border-bottom: var(--line-thin) solid var(--color-border);
  background: var(--color-panel-strong);
}

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

.mobile-nav-group {
  padding: 8px var(--gutter);
  border-bottom: var(--line-thin) solid var(--color-border);
}

.mobile-nav-label {
  margin: 8px 0 3px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .13em;
}

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  padding: 10px 0;
  border-bottom: var(--line-thin) solid var(--color-border);
  color: var(--color-muted);
}

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

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

.nav-veil {
  position: fixed;
  z-index: 1;
  inset: var(--header-height) 0 0;
  display: none;
  background: var(--color-bg);
  opacity: .72;
}

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

.site-footer {
  border-top: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr .72fr 1.25fr .72fr;
  gap: clamp(30px, 5vw, 72px);
  padding-top: 64px;
  padding-bottom: 52px;
}

.footer-brand-row {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-bottom: 18px;
}

.footer-brand-row img {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.footer-brand-row strong {
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: .06em;
}

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

.footer-title {
  margin: 0 0 16px;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.footer-links {
  display: grid;
  gap: 9px;
}

.footer-links a {
  width: max-content;
  max-width: 100%;
  color: var(--color-muted);
  overflow-wrap: anywhere;
}

.footer-links a:hover {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 19px;
  padding-bottom: 22px;
  border-top: var(--line-thin) solid var(--color-border);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .05em;
}

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

@media (max-width: 1080px) {
  .site-header-bar {
    grid-template-columns: minmax(220px, 1fr) auto;
  }

  .desktop-nav {
    display: none;
  }

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

  .language-toggle {
    display: none;
  }

  .language-menu {
    display: none !important;
  }

  .menu-toggle {
    display: block;
  }

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

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

@media (max-width: 720px) {
  :root {
    --header-height: 64px;
    --gutter: clamp(16px, 5vw, 24px);
  }

  .site-header-bar {
    min-height: var(--header-height);
    padding-inline: var(--gutter);
  }

  .site-brand {
    gap: 9px;
  }

  .site-brand img {
    width: 32px;
    height: 32px;
  }

  .site-brand-name {
    font-size: 17px;
  }

  .site-brand-register {
    display: none;
  }

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

  .section-heading {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .footer-grid {
    gap: 34px;
    padding-top: 50px;
  }

  .footer-legal {
    align-items: flex-start;
    flex-direction: column;
  }

  .button-row .btn {
    flex: 1 1 170px;
  }
}

@media (max-width: 640px) {
  .wrap,
  .reading-wrap {
    width: 100%;
    padding-inline: var(--gutter);
  }

  h1 {
    font-size: clamp(46px, 14vw, 62px);
  }

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

  .panel,
  .card {
    min-width: 0;
  }

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

  pre {
    padding: 16px;
  }

  .prose {
    font-size: 16px;
  }
}

@media (max-width: 360px) {
  .site-brand-name {
    font-size: 15px;
    letter-spacing: .03em;
  }

  .menu-toggle {
    min-width: 44px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0s !important;
  }

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