:root {
  --color-bg: #F6EEDC;
  --color-bg-top: #FBF6EA;
  --color-bg-bottom: #F1E6CE;
  --color-panel: #FFFBF3;
  --color-panel-alt: #EDE2CA;
  --color-border: #DECFB2;
  --color-accent: #0B4F6C;
  --color-accent-dark: #073545;
  --color-honey: #F2B233;
  --color-text: #2B2218;
  --color-muted: #6B5E4E;
  --color-success: #2E7D4F;
  --color-warning: #C9891C;
  --color-error: #B8372B;
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-flag-red: #C63C3C;
  --color-flag-blue: #17466F;
  --color-flag-white: #FFFFFF;
  --color-flag-star: #FFFFFF;
  --accent-rgb: 11, 79, 108;
  --honey-rgb: 242, 178, 51;
  --panel-rgb: 255, 251, 243;
  --black-rgb: 0, 0, 0;
  --font-display: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius-xl: 28px;
  --radius-lg: 24px;
  --radius-md: 20px;
  --radius-button: 16px;
  --radius-small: 12px;
  --radius-pill: 999px;
  --header-height: 72px;
  --gutter: 24px;
  --section-space: 96px;
  --shadow-card: 0 20px 52px -32px rgba(var(--accent-rgb), .28), inset 0 1px 0 rgba(var(--panel-rgb), .95);
  --shadow-float: 0 14px 30px -14px rgba(var(--accent-rgb), .35), 0 2px 6px rgba(var(--accent-rgb), .06), inset 0 1px 0 rgba(var(--panel-rgb), .9);
  --focus-ring: 0 0 0 3px rgba(var(--honey-rgb), .72);
  --toc-offset: 136px;
  --transition-fast: 160ms ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  color: var(--color-text);
  background-color: var(--color-bg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

img {
  height: auto;
}

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

button,
summary,
select {
  color: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

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

p,
h1,
h2,
h3,
h4,
ul,
ol,
dl,
dd,
blockquote,
figure {
  margin: 0;
}

ul,
ol {
  padding: 0;
}

li {
  min-width: 0;
}

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

:not(pre) > code {
  padding: .14em .38em;
  border: 1px solid var(--color-border);
  border-radius: 7px;
  background: var(--color-panel-alt);
  overflow-wrap: anywhere;
  word-break: break-word;
}

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

pre code {
  white-space: pre;
}

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

:where(a, button, summary, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  box-shadow: var(--focus-ring);
}

.wrap {
  width: 100%;
  max-width: 1248px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.narrow {
  width: 100%;
  max-width: 880px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.section-tight {
  padding-top: 64px;
  padding-bottom: 64px;
}

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

.card {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.eyebrow,
.badge,
.fact-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  min-height: 30px;
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.3;
}

.eyebrow-dot,
.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-honey);
}

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

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

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

h1,
.display-title {
  font-size: clamp(52px, 5.15vw, 72px);
  line-height: 1.1;
  letter-spacing: -.02em;
  font-weight: 900;
}

h2 {
  font-size: clamp(34px, 3.5vw, 52px);
  line-height: 1.14;
  letter-spacing: -.018em;
  font-weight: 900;
}

h3 {
  font-size: clamp(22px, 2.2vw, 30px);
  line-height: 1.25;
  font-weight: 800;
}

h4 {
  font-size: 18px;
  line-height: 1.35;
  font-weight: 800;
}

.section-heading {
  max-width: 800px;
  margin-bottom: 40px;
}

.section-heading p {
  margin-top: 14px;
  color: var(--color-muted);
  font-size: 18px;
}

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

.keyword-highlight {
  position: relative;
  isolation: isolate;
  padding-inline: .03em;
  color: var(--color-accent);
}

.keyword-highlight::after {
  position: absolute;
  right: 0;
  bottom: .05em;
  left: 0;
  z-index: -1;
  height: .26em;
  border-radius: 6px;
  background: var(--color-honey);
  content: "";
}

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

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

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

.lead {
  color: var(--color-muted);
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.7;
}

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

.prose > * + * {
  margin-top: 20px;
}

.prose h2 {
  margin-top: 64px;
}

.prose h3 {
  margin-top: 40px;
}

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

.prose ul,
.prose ol {
  padding-left: 1.4em;
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 24px;
  min-height: 50px;
  padding: 10px 28px;
  border: 1.5px solid transparent;
  border-radius: var(--radius-button);
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.btn svg {
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
}

.btn-primary {
  border-color: var(--color-accent);
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-dark));
  color: var(--color-panel);
  box-shadow: 0 12px 26px -10px rgba(var(--accent-rgb), .6), inset 0 1px 0 rgba(var(--panel-rgb), .18);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px -10px rgba(var(--accent-rgb), .65), inset 0 1px 0 rgba(var(--panel-rgb), .18);
}

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

.btn-secondary:hover {
  background: rgba(var(--accent-rgb), .06);
}

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

.btn-small {
  min-height: 40px;
  padding: 8px 18px;
  border-radius: 14px;
  font-size: 14px;
}

.btn[aria-disabled="true"],
.btn:disabled {
  cursor: not-allowed;
  opacity: .52;
  transform: none;
}

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

.reveal {
  transition: opacity .58s ease, transform .58s ease;
}

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

.reveal.shown {
  opacity: 1;
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(var(--accent-rgb), .1);
  background: var(--color-bg-top);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: var(--header-height);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  min-height: 44px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 850;
  letter-spacing: -.02em;
}

.brand-logo {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  filter: drop-shadow(0 4px 10px rgba(var(--accent-rgb), .3));
}

.brand-local {
  color: var(--color-muted);
  font-weight: 600;
}

.desktop-nav {
  display: flex;
  align-self: stretch;
  align-items: stretch;
}

.desktop-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding-inline: 13px;
  color: var(--color-muted);
  font-size: 15px;
  font-weight: 700;
}

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

.desktop-nav a[aria-current="page"]::after {
  position: absolute;
  right: 13px;
  bottom: -1px;
  left: 13px;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: var(--color-accent);
  content: "";
}

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

.login-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 8px 20px;
  border: 1.5px solid var(--color-accent);
  border-radius: 14px;
  background: var(--color-panel);
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 800;
}

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

.language-picker {
  position: relative;
}

.language-button,
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 8px 10px;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--color-muted);
  font-weight: 700;
}

.language-button:hover,
.menu-toggle:hover {
  background: rgba(var(--accent-rgb), .07);
  color: var(--color-text);
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 70;
  display: none;
  width: 176px;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-button);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

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

.language-menu a {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--color-muted);
  font-size: 14px;
}

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

.menu-toggle {
  display: none;
}

.menu-toggle-lines {
  position: relative;
  width: 20px;
  height: 14px;
}

.menu-toggle-lines::before,
.menu-toggle-lines::after,
.menu-toggle-lines span {
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.menu-toggle-lines::before {
  top: 0;
}

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

.menu-toggle-lines::after {
  top: 12px;
}

.mobile-nav {
  display: none;
}

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

.site-footer {
  overflow-x: clip;
  background: var(--color-accent-dark);
  color: var(--color-panel);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(260px, 1.25fr) repeat(3, minmax(150px, 1fr));
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 48px;
}

.footer-brand {
  max-width: 340px;
}

.footer-brand .brand-link {
  color: var(--color-panel);
}

.footer-brand p {
  margin-top: 16px;
  color: var(--color-bg-bottom);
}

.footer-title {
  margin-bottom: 14px;
  color: var(--color-panel);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .06em;
}

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

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

.footer-links a:hover {
  color: var(--color-honey);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 24px;
  padding-bottom: 28px;
  border-top: 1px solid rgba(var(--panel-rgb), .16);
  color: var(--color-bg-bottom);
  font-size: 13px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

#server-status {
  position: relative;
  display: block;
  width: 100%;
  max-width: 100%;
  margin-bottom: 32px;
  overflow: hidden;
}

#server-status > * {
  min-width: 0;
}

body:has(.toc-tabs) section[id] {
  scroll-margin-top: var(--toc-offset);
}

@media (max-width: 1080px) {
  .header-inner {
    gap: 16px;
  }

  .desktop-nav a {
    padding-inline: 9px;
    font-size: 14px;
  }

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

@media (max-width: 820px) {
  :root {
    --section-space: 72px;
  }

  h1,
  .display-title {
    font-size: clamp(34px, 8vw, 40px);
    line-height: 1.12;
  }

  h2 {
    font-size: clamp(29px, 6vw, 38px);
  }

  .desktop-nav,
  .language-picker {
    display: none;
  }

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

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

  .mobile-nav-veil {
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: 48;
    background: rgba(var(--black-rgb), .28);
  }

  .site-header.menu-open .mobile-nav-veil {
    display: block;
  }

  .mobile-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    z-index: 55;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 12px var(--gutter) 22px;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-panel);
    box-shadow: var(--shadow-card);
  }

  .site-header.menu-open .mobile-nav {
    display: block;
  }

  .mobile-nav ul {
    display: grid;
    list-style: none;
  }

  .mobile-nav a {
    display: flex;
    align-items: center;
    width: 100%;
    min-height: 48px;
    padding: 11px 12px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
    font-weight: 700;
  }

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

  .mobile-language-label {
    margin-top: 16px;
    padding: 8px 12px 4px;
    color: var(--color-muted);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .08em;
  }

  .footer-main {
    gap: 36px;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --section-space: 56px;
    --toc-offset: 124px;
  }

  body {
    font-size: 15px;
  }

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

  .wrap,
  .narrow {
    width: 100%;
    padding-inline: var(--gutter);
  }

  .card {
    padding: 22px;
  }

  .button-row {
    width: 100%;
  }

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

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

  .decorative-layer,
  .stripe-halo,
  .ambient-shape {
    max-width: 100%;
    overflow-x: clip;
  }

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

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

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

  .login-link {
    padding-inline: 14px;
  }

  .language-button-label {
    display: none;
  }
}

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

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

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