:root {
  --color-bg: #142E4E;
  --color-panel: #1B3A60;
  --color-panel-raised: #224672;
  --color-deep: #0F2440;
  --color-deepest: #0A1B33;
  --color-border: #33547C;
  --color-accent: #2F8DFF;
  --color-accent-dark: #1565D8;
  --color-accent-soft: #8FC1FF;
  --color-gate: #EAF6FF;
  --color-text: #F2F7FD;
  --color-muted: #A9C0DB;
  --color-success: #3ECF8E;
  --color-warning: #F5B93D;
  --color-error: #F06455;
  --color-pink: #F27BA9;
  --color-orange: #F08A4B;
  --color-rack: #193456;
  --color-rack-dark: #172F4E;
  --color-rack-far: #152A45;
  --color-flag-red: #D64545;
  --color-flag-blue: #2C4C86;
  --color-flag-white: #F7FAFD;
  --color-shadow: rgba(6, 16, 32, 0.35);
  --color-shadow-deep: rgba(6, 16, 32, 0.5);
  --color-accent-haze: rgba(47, 141, 255, 0.12);
  --color-panel-wash: rgba(34, 70, 114, 0.48);
  --color-rule: rgba(169, 192, 219, 0.18);
  --color-veil: rgba(10, 27, 51, 0.72);
  --font-display: Georgia, "Iowan Old Style", "Times New Roman", "Songti SC", "SimSun", serif;
  --font-body: "Inter", "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --shadow-low: 0 2px 6px var(--color-shadow);
  --shadow-high: 0 12px 30px var(--color-shadow-deep), 0 2px 6px var(--color-shadow);
  --page-max: 1200px;
  --reading-max: 780px;
  --gutter: clamp(16px, 4vw, 36px);
  --header-height: 70px;
  --section-space: clamp(64px, 9vw, 112px);
  --toc-offset: 84px;
  --ease-standard: 220ms ease;
}

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

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

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 0;
  margin: 0;
  padding: 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;
}

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

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

img {
  height: auto;
}

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

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

button {
  color: inherit;
}

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

p,
ul,
ol,
blockquote,
figure {
  margin-top: 0;
}

ul,
ol {
  padding-left: 1.25rem;
}

nav ul,
.clean-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

code {
  overflow-wrap: anywhere;
  color: var(--color-accent-soft);
}

pre {
  max-width: 100%;
  margin: 24px 0;
  padding: 20px;
  overflow-x: auto;
  border-radius: var(--radius-sm);
  background: var(--color-deepest);
  color: var(--color-text);
  -webkit-overflow-scrolling: touch;
}

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

table {
  border-collapse: collapse;
}

th,
td {
  text-align: left;
}

hr {
  height: 1px;
  margin: 40px 0;
  border: 0;
  background: var(--color-rule);
}

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

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

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

.reading-wrap {
  width: 100%;
  max-width: calc(var(--reading-max) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.section-compact {
  padding-top: clamp(42px, 6vw, 72px);
  padding-bottom: clamp(42px, 6vw, 72px);
}

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

.surface-raised {
  background: var(--color-panel-raised);
}

.panel {
  padding: clamp(22px, 4vw, 38px);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-low);
}

.card {
  padding: 26px;
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-low);
}

.stack > * + * {
  margin-top: 18px;
}

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

.grid {
  display: grid;
  gap: 24px;
}

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

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

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

.eyebrow {
  margin: 0 0 12px;
  color: var(--color-accent-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

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

h1,
.display-title {
  margin-bottom: 22px;
  font-family: var(--font-display);
  font-size: clamp(52px, 5.2vw, 72px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0.01em;
}

h2 {
  margin-bottom: 18px;
  font-family: var(--font-display);
  font-size: clamp(34px, 4vw, 50px);
  line-height: 1.18;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(21px, 2.2vw, 27px);
  line-height: 1.3;
}

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

p {
  margin-bottom: 18px;
}

.lead {
  max-width: 780px;
  color: var(--color-muted);
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.8;
}

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

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

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

.section-heading {
  max-width: 780px;
  margin-bottom: 38px;
}

.section-heading p {
  color: var(--color-muted);
  font-size: 17px;
}

.badge,
.status-badge,
.tag {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  gap: 8px;
  padding: 6px 13px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  background: var(--color-panel-raised);
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.4;
}

.badge-dot,
.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  background: var(--color-success);
}

.tag {
  border-radius: var(--radius-xs);
  color: var(--color-accent-soft);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.btn,
.btn-primary,
.btn-secondary,
.btn-quiet,
.btn-login {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 24px;
  border: 0;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 650;
  line-height: 1.2;
  text-align: center;
  transition: background-color var(--ease-standard), color var(--ease-standard), transform var(--ease-standard), box-shadow var(--ease-standard);
}

.btn-primary {
  min-height: 52px;
  padding-inline: 34px;
  background: var(--color-accent);
  color: var(--color-text);
  box-shadow: var(--shadow-high);
}

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

.btn-secondary {
  min-height: 52px;
  padding-inline: 34px;
  background: var(--color-panel-raised);
  color: var(--color-text);
  box-shadow: var(--shadow-low);
}

.btn-secondary:hover,
.btn-login:hover {
  background: var(--color-border);
}

.btn-quiet {
  min-height: 42px;
  padding-inline: 16px;
  background: transparent;
  color: var(--color-muted);
}

.btn-quiet:hover {
  color: var(--color-text);
}

.btn-login {
  min-height: 38px;
  padding-inline: 20px;
  border-radius: var(--radius-sm);
  background: var(--color-panel-raised);
  color: var(--color-text);
  box-shadow: var(--shadow-low);
}

.btn[aria-disabled="true"],
.btn-primary:disabled,
.btn-secondary:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

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

.site-header {
  position: relative;
  z-index: 100;
  background: var(--color-bg);
}

.header-inner {
  width: 100%;
  max-width: 1280px;
  height: var(--header-height);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 32px;
}

.site-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 11px;
}

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

.brand-word {
  font-size: 18px;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.brand-local {
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 500;
}

.desktop-nav {
  display: flex;
  flex: 1 1 auto;
  align-items: stretch;
  gap: 4px;
}

.desktop-nav a {
  position: relative;
  display: inline-flex;
  height: var(--header-height);
  align-items: center;
  padding-inline: 11px;
  color: var(--color-muted);
  font-size: 14px;
  white-space: nowrap;
}

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

.desktop-nav a[aria-current="page"] {
  font-weight: 650;
}

.desktop-nav a[aria-current="page"]::after {
  position: absolute;
  right: 11px;
  bottom: 0;
  left: 11px;
  height: 3px;
  border-radius: var(--radius-xs) var(--radius-xs) 0 0;
  background: var(--color-accent);
  content: "";
}

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

.language-control {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 7px;
  padding: 0 8px;
  border: 0;
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  font-size: 13px;
}

.language-button:hover {
  color: var(--color-text);
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 154px;
  padding: 7px;
  border-radius: var(--radius-sm);
  background: var(--color-panel-raised);
  box-shadow: var(--shadow-high);
}

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

.language-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  padding: 8px 11px;
  border-radius: var(--radius-xs);
  color: var(--color-muted);
  font-size: 13px;
}

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

.menu-toggle {
  display: none;
  width: 44px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: var(--color-panel-raised);
  cursor: pointer;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  display: block;
  width: 19px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-text);
  content: "";
}

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

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

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

.mobile-nav {
  display: none;
}

.mobile-nav[aria-hidden="false"] {
  display: block;
}

.mobile-nav-panel {
  position: absolute;
  z-index: 103;
  top: var(--header-height);
  right: 0;
  left: 0;
  max-height: calc(100dvh - var(--header-height));
  padding: 12px var(--gutter) 22px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--color-deep);
  box-shadow: var(--shadow-high);
}

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

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

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

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

.nav-veil[hidden] {
  display: none;
}

.site-footer {
  padding-top: 62px;
  background: var(--color-deepest);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr 1.2fr 0.8fr;
  gap: 40px;
}

.footer-brand {
  max-width: 330px;
}

.footer-brand .site-brand {
  margin-bottom: 16px;
}

.footer-brand p,
.footer-column a,
.footer-language a {
  color: var(--color-muted);
  font-size: 14px;
}

.footer-column h2,
.footer-language h2 {
  margin-bottom: 14px;
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.08em;
}

.footer-column ul,
.footer-language ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-column li + li,
.footer-language li + li {
  margin-top: 8px;
}

.footer-column a:hover,
.footer-language a:hover {
  color: var(--color-text);
}

.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-keywords a {
  display: inline-flex;
  padding: 5px 9px;
  border-radius: var(--radius-xs);
  background: var(--color-panel);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  margin-top: 44px;
  padding-top: 22px;
  padding-bottom: 26px;
  border-top: 1px solid var(--color-rule);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

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

.reveal {
  transition: opacity 560ms ease, transform 560ms ease;
}

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

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

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

.prose p,
.prose li {
  color: var(--color-muted);
}

.prose h2 {
  margin-top: 56px;
}

.prose h3 {
  margin-top: 34px;
}

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

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

.prose > .data-table {
  display: block;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

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

.decorated-region,
.hero-shell,
.preview-hero,
.cta-band {
  overflow-x: clip;
}

@media (max-width: 1100px) {
  .desktop-nav a {
    padding-inline: 8px;
    font-size: 13px;
  }

  .header-inner {
    gap: 20px;
  }

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

@media (max-width: 860px) {
  h1,
  .display-title {
    font-size: clamp(34px, 8vw, 40px);
  }

  h2 {
    font-size: clamp(29px, 7vw, 38px);
  }

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

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

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

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --header-height: 64px;
    --toc-offset: 76px;
  }

  body {
    font-size: 15px;
  }

  .brand-local {
    display: none;
  }

  .site-brand img {
    width: 31px;
    height: 31px;
  }

  .brand-word {
    font-size: 16px;
  }

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

  .btn-login {
    min-height: 40px;
    padding-inline: 14px;
  }

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

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

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

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

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

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

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

@media (max-width: 380px) {
  .brand-local {
    display: none;
  }

  .header-tools {
    gap: 6px;
  }

  .btn-login {
    padding-inline: 11px;
    font-size: 13px;
  }
}

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

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

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