:root {
  --color-bg: #FBF7EA;
  --color-panel: #FFFDF6;
  --color-panel-alt: #F3ECDA;
  --color-border: #E4DAC4;
  --color-accent: #5C7221;
  --color-accent-dark: #46591A;
  --color-accent-light: #7E9639;
  --color-accent-soft: rgba(92, 114, 33, 0.14);
  --color-accent-line: rgba(92, 114, 33, 0.55);
  --color-text: #2C2619;
  --color-muted: #6F6753;
  --color-success: #2F7D5B;
  --color-warn: #B5801F;
  --color-error: #B04632;
  --color-flag-red: #BE4638;
  --color-flag-blue: #35518D;
  --color-flag-white: #FFFDF6;
  --color-shadow: rgba(96, 84, 54, 0.28);
  --color-shadow-light: rgba(96, 84, 54, 0.18);
  --color-overlay: rgba(44, 38, 25, 0.32);
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --radius-xl: 36px;
  --radius-lg: 28px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --shadow-soft: 0 20px 44px -24px var(--color-shadow);
  --shadow-chip: 0 8px 20px -12px var(--color-shadow);
  --shadow-panel: 0 30px 70px -46px var(--color-shadow);
  --wrap-max: 1340px;
  --reading-max: 820px;
  --gutter: 44px;
  --header-height: 72px;
  --focus-ring: 2px solid var(--color-accent);
  --section-space: clamp(72px, 9vw, 132px);
  --toc-offset: 92px;
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  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;
}

body::before {
  position: fixed;
  z-index: 80;
  inset: 0;
  pointer-events: none;
  content: "";
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.045'/%3E%3C/svg%3E");
}

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

img {
  display: block;
  height: auto;
}

svg {
  flex-shrink: 0;
}

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

button {
  border: 0;
  cursor: pointer;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

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

a,
button,
summary,
[role="tab"],
select,
input,
textarea {
  outline-offset: 3px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[role="tab"]:focus-visible,
select:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: var(--focus-ring);
}

p,
h1,
h2,
h3,
h4,
ul,
ol,
figure,
blockquote,
pre {
  margin-top: 0;
}

p,
ul,
ol,
blockquote,
pre {
  margin-bottom: 1.25em;
}

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

h1 {
  margin-bottom: 24px;
  font-size: clamp(52px, 5vw, 72px);
  font-weight: 520;
  letter-spacing: -0.012em;
  line-height: 1.13;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 540;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 590;
  line-height: 1.3;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 650;
}

strong {
  font-weight: 650;
}

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

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel-alt);
  -webkit-overflow-scrolling: touch;
}

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

hr {
  margin: 42px 0;
  border: 0;
  border-top: 1px solid var(--color-border);
}

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

.wrap {
  width: 100%;
  max-width: var(--wrap-max);
  min-width: 0;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.reading {
  width: 100%;
  max-width: var(--reading-max);
  min-width: 0;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  min-width: 0;
  overflow-x: clip;
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

.section-compact {
  padding-top: clamp(48px, 6vw, 84px);
  padding-bottom: clamp(48px, 6vw, 84px);
}

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

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

.eyebrow,
.badge,
.tag {
  display: inline-flex;
  max-width: 100%;
  min-height: 28px;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.4;
  text-overflow: ellipsis;
}

.eyebrow-dot,
.status-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-accent);
}

.badge-accent {
  border-color: var(--color-accent-line);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
}

.tag {
  min-height: 26px;
  padding: 4px 10px;
  background: var(--color-panel-alt);
}

.btn,
.btn-primary,
.btn-secondary,
.btn-quiet,
.btn-login {
  display: inline-flex;
  min-width: 24px;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 28px;
  border: 1.5px solid transparent;
  border-radius: var(--radius-pill);
  font-weight: 620;
  line-height: 1.2;
  text-align: center;
  transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.btn-primary {
  background: var(--color-accent);
  box-shadow: var(--shadow-soft);
  color: var(--color-panel);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  color: var(--color-panel);
  transform: translateY(-1px);
}

.btn-secondary {
  border-color: var(--color-border);
  background: var(--color-panel);
  color: var(--color-text);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
}

.btn-quiet {
  min-height: 40px;
  padding: 8px 18px;
  color: var(--color-accent-dark);
}

.btn-quiet:hover {
  background: var(--color-accent-soft);
}

.btn[aria-disabled="true"],
.btn:disabled {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
}

.button-row {
  display: flex;
  min-width: 0;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.panel,
.card {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
}

.panel {
  padding: clamp(24px, 4vw, 44px);
}

.card {
  padding: 26px;
}

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

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

.grid {
  display: grid;
  min-width: 0;
  gap: 24px;
}

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

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

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

.site-header {
  position: relative;
  z-index: 60;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.header-inner {
  display: flex;
  height: var(--header-height);
  align-items: center;
  gap: 24px;
}

.site-brand {
  display: inline-flex;
  min-width: max-content;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
}

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

.brand-logo {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.brand-copy {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 670;
}

.brand-local {
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 480;
}

.desktop-nav {
  display: flex;
  min-width: 0;
  flex: 1 1 auto;
  align-items: center;
  gap: 3px;
}

.nav-link {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  font-size: 13px;
  white-space: nowrap;
}

.nav-link svg {
  width: 15px;
  height: 15px;
}

.nav-link:hover {
  background: var(--color-panel-alt);
  color: var(--color-text);
}

.nav-link.is-active {
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
}

.header-tools {
  position: relative;
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
}

.language-control {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-width: 44px;
  min-height: 40px;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-muted);
  font-size: 13px;
}

.language-menu {
  position: absolute;
  z-index: 72;
  top: calc(100% + 10px);
  right: 0;
  display: none;
  width: 180px;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
}

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

.language-menu a {
  display: flex;
  min-height: 40px;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

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

.btn-login {
  min-height: 40px;
  padding: 8px 19px;
  border-color: var(--color-accent);
  background: var(--color-panel);
  color: var(--color-accent-dark);
  font-size: 13px;
}

.btn-login:hover {
  background: var(--color-accent);
  color: var(--color-panel);
}

.menu-toggle {
  display: none;
  width: 44px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-panel-alt);
  color: var(--color-text);
}

.menu-toggle svg {
  width: 21px;
  height: 21px;
}

.mobile-nav {
  position: absolute;
  z-index: 71;
  top: var(--header-height);
  right: 0;
  left: 0;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  padding: 12px var(--gutter) 24px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
  overscroll-behavior: contain;
}

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

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.mobile-nav a:hover,
.mobile-nav a.is-active {
  background: var(--color-panel-alt);
  color: var(--color-accent-dark);
}

.mobile-nav svg {
  width: 18px;
  height: 18px;
}

.mobile-language-list {
  display: grid;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--color-border);
}

.nav-veil {
  position: fixed;
  z-index: 55;
  inset: var(--header-height) 0 0;
  display: none;
  background: var(--color-overlay);
}

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

.site-footer {
  position: relative;
  overflow-x: clip;
  border-top: 1px solid var(--color-border);
  background: var(--color-panel-alt);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(240px, 1.35fr) repeat(2, minmax(180px, 1fr));
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 48px;
}

.footer-brand p {
  max-width: 32em;
  color: var(--color-muted);
}

.footer-title {
  margin-bottom: 14px;
  font-size: 14px;
  font-weight: 680;
}

.footer-links,
.footer-hot,
.footer-languages {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.footer-links a,
.footer-hot a,
.footer-languages a {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  color: var(--color-muted);
  font-size: 14px;
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-top: 20px;
  padding-bottom: 26px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 13px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.reveal {
  transition: opacity 620ms ease, transform 620ms ease;
}

.reveal.pending {
  opacity: 0;
  transform: translateY(16px);
}

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

.prose {
  min-width: 0;
}

.prose h2,
.prose h3 {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.prose a {
  text-decoration: underline;
  text-decoration-color: var(--color-accent-line);
  text-underline-offset: 3px;
}

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

.prose img {
  border-radius: var(--radius-md);
}

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

@media (max-width: 1160px) {
  .desktop-nav {
    display: none;
  }

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

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

  .language-control {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 22px;
    --header-height: 66px;
    --toc-offset: 82px;
  }

  h1 {
    font-size: clamp(32px, 9vw, 40px);
    line-height: 1.14;
  }

  h2 {
    font-size: clamp(28px, 7vw, 36px);
  }

  .grid-2,
  .grid-3,
  .footer-main {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-main {
    gap: 32px;
  }

  .brand-local {
    display: none;
  }

  .btn-login {
    padding-inline: 15px;
  }

  .section {
    padding-top: 68px;
    padding-bottom: 68px;
  }

  .tilt {
    transform: none;
  }
}

@media (max-width: 480px) {
  :root {
    --gutter: 16px;
  }

  body {
    font-size: 15px;
  }

  .header-inner {
    gap: 8px;
  }

  .brand-logo {
    width: 28px;
    height: 28px;
  }

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

  .header-tools {
    gap: 6px;
  }

  .btn-login {
    min-height: 38px;
    padding-inline: 13px;
  }

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

  .button-row .btn,
  .button-row .btn-primary,
  .button-row .btn-secondary {
    flex: 1 1 140px;
  }

  .panel,
  .card {
    padding: 22px;
  }
}

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

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

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