:root {
  --color-bg: #120E0B;
  --color-bg-panel: #1B1410;
  --color-bg-panel-2: #261B14;
  --color-border: #6F522B;
  --color-accent: #C99A45;
  --color-accent-dark: #8B642C;
  --color-text: #F0E4CA;
  --color-text-muted: #B6A78C;
  --color-success: #9A9B68;
  --color-warning: #D5AA55;
  --color-error: #A72E24;
  --color-transparent: transparent;
  --color-bg-soft: rgb(27 20 16 / 72%);
  --color-bg-deep: rgb(18 14 11 / 94%);
  --color-bg-solid: rgb(18 14 11 / 100%);
  --color-panel-solid: rgb(27 20 16 / 100%);
  --color-accent-faint: rgb(201 154 69 / 8%);
  --color-accent-soft: rgb(201 154 69 / 16%);
  --color-accent-medium: rgb(201 154 69 / 34%);
  --color-accent-strong: rgb(201 154 69 / 70%);
  --color-highlight: rgb(240 228 202 / 10%);
  --color-highlight-strong: rgb(240 228 202 / 18%);
  --color-shadow: rgb(0 0 0 / 52%);
  --color-shadow-soft: rgb(0 0 0 / 28%);
  --color-error-shadow: rgb(167 46 36 / 26%);
  --color-error-dark: rgb(75 20 16 / 100%);
  --font-display: "STSong", "Songti SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --radius-square: 0;
  --radius-chip: 999px;
  --page-width: 1360px;
  --content-width: 1120px;
  --reading-width: 820px;
  --header-height: 82px;
  --gutter: clamp(16px, 4vw, 32px);
  --section-space: clamp(72px, 10vw, 132px);
  --line-hairline: 1px;
  --line-strong: 2px;
  --shadow-panel: 0 24px 70px var(--color-shadow), inset 0 1px 0 var(--color-highlight);
  --shadow-card: 12px 14px 0 var(--color-shadow-soft), inset 0 1px 0 var(--color-highlight);
  --shadow-button: 0 12px 28px var(--color-error-shadow), inset 0 1px 0 var(--color-highlight-strong);
  --tracking-wide: 0.16em;
  --tracking-mono: 0.12em;
  --motion-fast: 160ms;
  --motion-reveal: 620ms;
  --motion-direct: 34s;
  --motion-proxy: 27s;
  --motion-reject: 19s;
}

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

html {
  width: 100%;
  margin: 0;
  scroll-behavior: smooth;
  background: var(--color-bg);
}

html.nav-open {
  overflow: hidden;
}

body {
  width: 100%;
  min-width: 0;
  min-height: 100%;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background:
    radial-gradient(circle at 72% 20%, var(--color-accent-faint) 0, var(--color-transparent) 31%),
    radial-gradient(circle at 50% 18%, var(--color-transparent) 0, var(--color-transparent) 42%, var(--color-bg-deep) 100%),
    var(--color-bg);
  font-family: var(--font-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: -35%;
  z-index: -2;
  content: "";
  opacity: 0.35;
  background:
    repeating-radial-gradient(
      circle at 69% 28%,
      var(--color-transparent) 0,
      var(--color-transparent) 17px,
      var(--color-accent-faint) 18px,
      var(--color-transparent) 19px
    );
  transform: rotate(-8deg);
  pointer-events: none;
}

body::after {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  opacity: 0.3;
  background-image:
    linear-gradient(90deg, var(--color-accent-faint) 1px, var(--color-transparent) 1px),
    linear-gradient(0deg, var(--color-accent-faint) 1px, var(--color-transparent) 1px);
  background-size: 84px 84px;
  mask-image: linear-gradient(to right, transparent, black 42%, black 100%);
  pointer-events: none;
}

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

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

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

button {
  cursor: pointer;
}

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

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

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

:not(pre) > code {
  padding: 0.1em 0.35em;
  border: var(--line-hairline) solid var(--color-accent-soft);
  background: var(--color-accent-faint);
  color: var(--color-accent);
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  border: var(--line-hairline) solid var(--color-border);
  background: var(--color-bg-panel);
  color: var(--color-text);
  box-shadow: inset 0 1px 0 var(--color-highlight);
  line-height: 1.7;
  -webkit-overflow-scrolling: touch;
}

pre code {
  white-space: pre;
  overflow-wrap: normal;
}

hr {
  border: 0;
  border-top: var(--line-hairline) solid var(--color-border);
}

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

:focus-visible {
  outline: var(--line-strong) solid var(--color-accent);
  outline-offset: 3px;
}

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

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

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

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

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

.section-compact {
  padding-top: calc(var(--section-space) * 0.62);
  padding-bottom: calc(var(--section-space) * 0.62);
  overflow-x: clip;
}

.section-kicker,
.eyebrow {
  display: flex;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  align-items: center;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.section-kicker::before,
.eyebrow::before {
  width: 36px;
  height: var(--line-hairline);
  margin-right: 12px;
  content: "";
  background: var(--color-accent);
  flex-shrink: 0;
}

.section-kicker::after,
.eyebrow::after {
  width: 6px;
  height: 6px;
  margin-left: 12px;
  border: var(--line-hairline) solid var(--color-accent);
  content: "";
  transform: rotate(45deg);
  flex-shrink: 0;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  text-wrap: balance;
}

h1 {
  margin-bottom: 28px;
  font-size: clamp(52px, 7.2vw, 108px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.05em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(34px, 4.5vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(23px, 2.3vw, 31px);
  line-height: 1.25;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  line-height: 1.4;
}

.lead {
  max-width: 760px;
  color: var(--color-text-muted);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.9;
}

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

.mono-label {
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
}

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

.button {
  display: inline-flex;
  min-height: 50px;
  padding: 0 24px;
  border: var(--line-hairline) solid var(--color-border);
  border-radius: var(--radius-square);
  background: var(--color-bg-soft);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 600;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.04em;
  transition:
    transform var(--motion-fast) ease,
    background-color var(--motion-fast) ease,
    border-color var(--motion-fast) ease;
}

.button-primary {
  border-color: var(--color-error);
  background: var(--color-error);
  box-shadow: var(--shadow-button);
}

.button-primary::after {
  margin-left: 18px;
  font-family: var(--font-mono);
  font-size: 16px;
  content: "↓";
}

.button-secondary {
  box-shadow: inset 0 1px 0 var(--color-highlight);
}

.button-secondary::after {
  margin-left: 18px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  content: "→";
}

.button-quiet {
  min-height: 42px;
  color: var(--color-text-muted);
}

.button:hover,
.button:focus-visible {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.button-primary:hover,
.button-primary:focus-visible {
  border-color: var(--color-error);
  background: var(--color-error-dark);
}

.button:active {
  transform: translateY(1px);
}

.button[disabled],
.button.is-disabled {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
}

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

.panel {
  padding: clamp(24px, 4vw, 48px);
  box-shadow: var(--shadow-panel);
}

.card {
  position: relative;
  padding: 24px;
}

.card::before,
.panel::before {
  pointer-events: none;
}

.etched-panel {
  position: relative;
  outline: var(--line-hairline) solid var(--color-accent-soft);
  outline-offset: -7px;
}

.etched-panel::after {
  position: absolute;
  top: 13px;
  right: 13px;
  width: 7px;
  height: 7px;
  border: var(--line-hairline) solid var(--color-accent);
  border-radius: var(--radius-chip);
  content: "";
  background: var(--color-accent-dark);
}

.badge,
.chip,
.tag {
  display: inline-flex;
  max-width: 100%;
  min-height: 27px;
  padding: 3px 11px;
  overflow: hidden;
  border: var(--line-hairline) solid var(--color-accent-medium);
  border-radius: var(--radius-chip);
  background: var(--color-accent-faint);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.5;
  align-items: center;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.badge::before,
.chip::before {
  width: 5px;
  height: 5px;
  margin-right: 8px;
  border-radius: var(--radius-chip);
  content: "";
  background: var(--color-success);
  flex-shrink: 0;
}

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

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

.badge-accent {
  border-radius: var(--radius-square);
  color: var(--color-accent);
}

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

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

.data-table th,
.data-table td {
  padding: 15px 18px;
  border-right: var(--line-hairline) solid var(--color-border);
  border-bottom: var(--line-hairline) solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: var(--tracking-mono);
}

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

.site-header {
  position: relative;
  z-index: 100;
  height: var(--header-height);
  border-bottom: var(--line-hairline) solid var(--color-border);
  background: var(--color-bg-deep);
}

.header-inner {
  position: relative;
  display: flex;
  width: 100%;
  max-width: calc(var(--page-width) + var(--gutter) * 2);
  height: 100%;
  margin: 0 auto;
  padding-inline: var(--gutter);
  align-items: center;
}

.brand {
  display: inline-flex;
  min-width: 0;
  gap: 13px;
  align-items: center;
  flex: 0 1 auto;
}

.brand-mark {
  display: block;
  width: 43px;
  height: 43px;
  border: var(--line-hairline) solid var(--color-accent);
  background: linear-gradient(145deg, var(--color-bg-panel-2), var(--color-bg-panel));
  box-shadow:
    inset 0 0 0 3px var(--color-bg),
    inset 0 0 0 4px var(--color-accent-dark);
  flex-shrink: 0;
}

.brand-mark img {
  width: 100%;
  height: 100%;
}

.brand-copy {
  min-width: 0;
}

.brand-name {
  display: block;
  overflow: hidden;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-index {
  display: block;
  margin-top: 2px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: var(--tracking-wide);
}

.primary-nav {
  display: flex;
  margin-left: auto;
  align-items: center;
  white-space: nowrap;
}

.primary-nav a {
  position: relative;
  padding: 12px 9px;
  color: var(--color-text-muted);
  font-size: 13px;
  letter-spacing: 0.04em;
  transition: color var(--motion-fast) ease;
}

.primary-nav a + a::before {
  position: absolute;
  left: -2px;
  color: var(--color-accent-dark);
  content: "·";
}

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

.primary-nav a[aria-current="page"]::after {
  position: absolute;
  right: 9px;
  bottom: 4px;
  left: 9px;
  height: var(--line-hairline);
  content: "";
  background: var(--color-accent);
}

.header-tools {
  display: flex;
  margin-left: 18px;
  gap: 8px;
  align-items: center;
  flex-shrink: 0;
}

.language-control {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-width: 114px;
  min-height: 34px;
  padding: 0 12px;
  border: var(--line-hairline) solid var(--color-border);
  background: var(--color-bg-panel);
  color: var(--color-text-muted);
  font-size: 12px;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.05em;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  display: none;
  width: 168px;
  padding: 6px;
  border: var(--line-hairline) solid var(--color-border);
  background: var(--color-panel-solid);
  box-shadow: var(--shadow-panel);
}

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

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 42px;
  padding: 8px 11px;
  color: var(--color-text-muted);
  align-items: center;
}

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

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

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

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

.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-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 90;
  display: none;
  border: 0;
  background: var(--color-shadow);
}

.mobile-drawer {
  position: fixed;
  top: var(--header-height);
  right: 0;
  z-index: 110;
  display: none;
  width: min(100%, 390px);
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  border-left: var(--line-hairline) solid var(--color-border);
  border-bottom: var(--line-hairline) solid var(--color-border);
  background: var(--color-panel-solid);
  overscroll-behavior: contain;
}

.mobile-drawer a {
  display: flex;
  width: 100%;
  min-height: 48px;
  padding: 12px 20px;
  border-bottom: var(--line-hairline) solid var(--color-border);
  color: var(--color-text-muted);
  align-items: center;
}

.mobile-drawer a[aria-current="page"],
.mobile-drawer a:hover,
.mobile-drawer a:focus-visible {
  background: var(--color-accent-faint);
  color: var(--color-text);
}

.mobile-drawer-label {
  padding: 18px 20px 8px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: var(--tracking-wide);
}

.site-header.is-menu-open .mobile-drawer,
.site-header.is-menu-open + .mobile-veil,
.mobile-veil.is-visible {
  display: block;
}

.site-footer {
  position: relative;
  overflow-x: clip;
  border-top: var(--line-hairline) solid var(--color-border);
  background: var(--color-bg-panel);
}

.footer-main {
  display: grid;
  padding-top: 70px;
  padding-bottom: 58px;
  grid-template-columns: 1.2fr 1fr 1.4fr 0.8fr;
  gap: 48px;
}

.footer-brand p {
  max-width: 340px;
  margin-top: 20px;
  color: var(--color-text-muted);
}

.footer-heading {
  margin-bottom: 16px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: var(--tracking-wide);
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-links a {
  width: fit-content;
  max-width: 100%;
  color: var(--color-text-muted);
  font-size: 13px;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-accent);
}

.footer-hot {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
}

.footer-hot a {
  display: inline-flex;
  max-width: 100%;
  padding: 5px 9px;
  overflow: hidden;
  border: var(--line-hairline) solid var(--color-accent-soft);
  color: var(--color-text-muted);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.footer-bottom {
  display: flex;
  min-height: 72px;
  border-top: var(--line-hairline) solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  align-items: center;
  justify-content: space-between;
  letter-spacing: var(--tracking-mono);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--motion-reveal) ease,
    transform var(--motion-reveal) ease;
}

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

.tilt,
.tilt-card {
  transform: rotate(-0.35deg);
}

.prose {
  min-width: 0;
  color: var(--color-text-muted);
}

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

.prose h2,
.prose h3,
.prose h4 {
  padding-top: 1.1em;
}

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

.prose li + li {
  margin-top: 8px;
}

.prose blockquote {
  margin-inline: 0;
}

@media (max-width: 1180px) {
  .primary-nav a {
    padding-inline: 6px;
    font-size: 12px;
  }

  .brand-index {
    display: none;
  }
}

@media (max-width: 960px) {
  :root {
    --header-height: 68px;
  }

  .site-header {
    position: sticky;
    top: 0;
  }

  .primary-nav,
  .language-control {
    display: none;
  }

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

  .menu-toggle {
    display: grid;
    place-items: center;
  }

  .brand-mark {
    width: 39px;
    height: 39px;
  }

  .brand-name {
    font-size: 18px;
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --section-space: 68px;
  }

  body::before {
    inset: -20%;
    transform: none;
  }

  body::after {
    background-size: 48px 48px;
    mask-image: none;
  }

  h1 {
    font-size: clamp(46px, 15vw, 70px);
  }

  h2 {
    font-size: clamp(32px, 10vw, 44px);
  }

  .header-inner {
    padding-inline: var(--gutter);
  }

  .brand {
    gap: 9px;
  }

  .brand-name {
    max-width: 190px;
    font-size: 17px;
  }

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

  .button {
    min-height: 52px;
  }

  .panel,
  .card {
    padding: 20px;
  }

  .tilt,
  .tilt-card {
    transform: none;
  }

  .footer-main {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }

  .footer-bottom {
    padding-top: 20px;
    padding-bottom: 20px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
  }

  .reveal {
    transform: translateY(14px);
  }

  .mobile-drawer {
    width: 100%;
    border-left: 0;
  }
}

@media (max-width: 360px) {
  .brand-name {
    max-width: 150px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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