:root {
  --color-bg: #5A4735;
  --color-panel: #4E3C2B;
  --color-panel-raised: #67543F;
  --color-border: #7C6750;
  --color-accent: #E86A28;
  --color-accent-dark: #C4531C;
  --color-text: #F2EAD9;
  --color-text-muted: #C8B9A2;
  --color-success: #9DB878;
  --color-warning: #E0B454;
  --color-error: #D95F4C;
  --color-transparent: transparent;
  --color-overlay: rgba(78, 60, 43, 0.96);
  --color-glow-clear: rgba(103, 84, 63, 0);
  --color-glow-warm: rgba(103, 84, 63, 0.55);
  --font-display: Georgia, "Times New Roman", "Songti SC", "Noto Serif CJK SC", SimSun, serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius: 6px;
  --line: 1px;
  --header-height: 76px;
  --content-width: 1120px;
  --wide-width: 1280px;
  --reading-width: 780px;
  --gutter: clamp(16px, 4vw, 32px);
  --space-1: 6px;
  --space-2: 10px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 72px;
  --space-8: 104px;
  --ease: 180ms ease;
}

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

html {
  scroll-behavior: smooth;
  background: var(--color-bg);
}

html.nav-open {
  overflow: hidden;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-wrap: break-word;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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-text);
  text-decoration-color: var(--color-border);
  text-underline-offset: 0.2em;
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

p,
ul,
ol,
dl,
blockquote,
pre,
table,
figure {
  margin-top: 0;
  margin-bottom: var(--space-4);
}

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

li + li {
  margin-top: var(--space-1);
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 400;
  text-wrap: balance;
}

h1 {
  margin-bottom: var(--space-4);
  font-size: clamp(34px, 4vw, 48px);
  line-height: 1.18;
  letter-spacing: 0;
}

h2 {
  margin-bottom: var(--space-3);
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.25;
}

h3 {
  margin-bottom: var(--space-2);
  font-size: clamp(21px, 2vw, 26px);
  line-height: 1.35;
}

h4 {
  margin-bottom: var(--space-2);
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 600;
}

strong {
  color: var(--color-text);
  font-weight: 650;
}

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

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

:not(pre) > code {
  overflow-wrap: anywhere;
  color: var(--color-text);
  border: var(--line) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  padding: 0.12em 0.38em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: var(--line) solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-panel);
  color: var(--color-text);
  padding: var(--space-4);
  line-height: 1.65;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

pre code {
  color: inherit;
  white-space: pre;
}

hr {
  height: var(--line);
  margin: var(--space-7) 0;
  border: 0;
  background: var(--color-border);
}

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

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

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

.wide-wrap {
  max-width: min(100%, calc(var(--wide-width) + var(--gutter) * 2));
}

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

.section {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  overflow-x: clip;
}

.section-compact {
  padding-top: var(--space-7);
  padding-bottom: var(--space-7);
}

.section-line {
  border-top: var(--line) solid var(--color-border);
}

.eyebrow {
  margin-bottom: var(--space-3);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.no-break {
  white-space: nowrap;
}

.lead {
  max-width: 720px;
  color: var(--color-text-muted);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.75;
}

.prose {
  max-width: 100%;
}

.prose h2 {
  margin-top: var(--space-7);
  padding-top: var(--space-3);
  border-top: var(--line) solid var(--color-border);
  scroll-margin-top: calc(var(--header-height) + var(--space-4));
}

.prose h3 {
  margin-top: var(--space-6);
}

.prose a {
  text-decoration: underline;
}

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

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

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

.data-table th {
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

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

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

.button,
.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: var(--line) solid var(--color-transparent);
  border-radius: var(--radius);
  padding: 14px 26px;
  color: var(--color-text);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.1;
  text-align: center;
  text-decoration: none;
  transition: background-color var(--ease), border-color var(--ease), color var(--ease);
}

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

.button-primary:hover,
.btn-primary:hover {
  border-color: var(--color-accent-dark);
  background: var(--color-accent-dark);
  color: var(--color-text);
  text-decoration: none;
}

.button-secondary,
.btn-ghost {
  border-color: var(--color-text);
  background: var(--color-transparent);
  color: var(--color-text);
}

.button-secondary:hover,
.btn-ghost:hover {
  border-color: var(--color-text);
  background: var(--color-panel-raised);
  color: var(--color-text);
  text-decoration: none;
}

.button-small,
.btn-sm {
  min-height: 42px;
  padding: 10px 19px;
  font-size: 14px;
}

.button:disabled,
.btn:disabled {
  cursor: not-allowed;
  border-color: var(--color-border);
  background: var(--color-panel-raised);
  color: var(--color-text-muted);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.panel,
.card {
  border: var(--line) solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-panel);
  color: var(--color-text);
}

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

.card {
  padding: var(--space-4);
}

.card p:last-child,
.panel p:last-child {
  margin-bottom: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.chip-row,
.badge-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding: 0;
  list-style: none;
}

.chip {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  overflow: hidden;
  border: var(--line) solid var(--color-border);
  border-radius: var(--radius);
  padding: 7px 12px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.35;
}

.chip-dot,
.status-dot,
.icon-fixed {
  flex-shrink: 0;
}

.chip-dot,
.status-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 600ms ease, transform 600ms ease;
}

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

.site-header {
  position: relative;
  z-index: 100;
  min-height: var(--header-height);
  border-bottom: var(--line) solid var(--color-border);
  background: var(--color-text);
  color: var(--color-panel);
}

.header-shell {
  width: 100%;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  height: var(--header-height);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 36px);
}

.site-brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 11px;
  color: var(--color-panel);
  text-decoration: none;
}

.site-brand img {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.site-brand-name {
  color: var(--color-panel);
  font-family: var(--font-display);
  font-size: 19px;
  white-space: nowrap;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 30px);
}

.desktop-nav > a,
.nav-more-button {
  position: relative;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border: 0;
  background: var(--color-transparent);
  color: var(--color-panel);
  font-size: 15px;
  text-decoration: none;
  white-space: nowrap;
}

.desktop-nav > a:hover,
.nav-more-button:hover,
.header-tool-button:hover {
  color: var(--color-accent-dark);
}

.desktop-nav > a[aria-current="page"]::after,
.nav-more.is-current > .nav-more-button::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 5px;
  left: 0;
  height: 2px;
  background: var(--color-accent);
}

.nav-more {
  position: relative;
}

.nav-more-button {
  gap: 6px;
  padding-inline: 0;
}

.nav-caret {
  font-size: 11px;
}

.nav-dropdown,
.language-menu {
  position: absolute;
  z-index: 130;
  top: calc(100% + 6px);
  min-width: 154px;
  padding: 6px;
  border: var(--line) solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-text);
  color: var(--color-panel);
}

.nav-dropdown {
  left: 50%;
  transform: translateX(-50%);
}

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

.nav-dropdown a,
.language-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  border-radius: var(--radius-sm);
  padding: 9px 13px;
  color: var(--color-panel);
  text-decoration: none;
}

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

.header-tools {
  position: relative;
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header-tool-button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  background: var(--color-transparent);
  color: var(--color-panel);
  padding: 7px 4px;
}

.language-menu {
  right: 0;
}

.lang-short {
  display: none;
}

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: var(--line) solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-text);
  color: var(--color-panel);
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  width: 20px;
  height: 1px;
  display: block;
  background: var(--color-panel);
}

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

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

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

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

.mobile-menu {
  display: none;
}

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

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

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.25fr 1fr;
  gap: var(--space-6);
  padding-top: var(--space-7);
  padding-bottom: var(--space-6);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: var(--space-3);
  font-family: var(--font-display);
  font-size: 20px;
}

.footer-brand img {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.footer-copy,
.footer-list a {
  color: var(--color-text-muted);
}

.footer-heading {
  margin-bottom: var(--space-3);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
}

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

.footer-list li + li {
  margin-top: 5px;
}

.footer-list a {
  display: inline-block;
  padding-block: 4px;
  text-decoration: none;
}

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

.footer-bottom {
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  border-top: var(--line) solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 14px;
}

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

@media (max-width: 1060px) {
  .desktop-nav,
  .header-download {
    display: none;
  }

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

  .menu-toggle {
    display: inline-flex;
  }

  .mobile-menu {
    position: absolute;
    z-index: 140;
    top: var(--header-height);
    right: 0;
    left: 0;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    border-top: var(--line) solid var(--color-border);
    border-bottom: var(--line) solid var(--color-border);
    background: var(--color-panel);
    color: var(--color-text);
    padding: 10px var(--gutter) 20px;
  }

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

  .mobile-menu a {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    border-bottom: var(--line) solid var(--color-border);
    color: var(--color-text);
    padding: 11px 4px;
    text-decoration: none;
  }

  .mobile-menu a[aria-current="page"] {
    color: var(--color-text);
    box-shadow: inset 3px 0 0 var(--color-accent);
    padding-left: 14px;
  }

  .mobile-language-title {
    margin: var(--space-4) 0 var(--space-2);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.1em;
  }

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

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

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

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7.4vw, 30px);
    line-height: 1.25;
  }

  h2 {
    font-size: clamp(25px, 7vw, 32px);
  }

  .section {
    padding-top: var(--space-7);
    padding-bottom: var(--space-7);
  }

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

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

  .header-shell {
    height: var(--header-height);
    gap: 10px;
  }

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

  .lang-full {
    display: none;
  }

  .lang-short {
    display: inline;
  }

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

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

  .chip-row,
  .badge-row {
    flex-direction: row;
    justify-content: flex-start;
  }

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

  .footer-grid {
    gap: var(--space-5);
  }

  .prose pre,
  .table-wrap {
    max-width: calc(100vw - var(--gutter) * 2);
  }
}

@media (max-width: 380px) {
  .site-brand-name {
    font-size: 15px;
  }

  .site-brand img {
    width: 30px;
    height: 30px;
  }

  .header-tool-button {
    padding-inline: 2px;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    scroll-behavior: auto !important;
    transition: none !important;
  }

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