:root {
  --color-page: #F6F0E2;
  --color-surface: #FCF8EE;
  --color-surface-soft: #EEE6D3;
  --color-line: #DDD2BA;
  --color-electric: #A3DB0F;
  --color-electric-light: #C7EE4A;
  --color-electric-dark: #5E7F0A;
  --color-ink: #221D14;
  --color-ink-soft: #6F6553;
  --color-success: #2E7D5B;
  --color-warning: #C98A12;
  --color-error: #C43C2E;
  --color-paper-white: #FFFFFF;
  --color-flag-red: #C9352B;
  --color-flag-blue: #2C4A8F;
  --color-flag-navy: #1E2F63;
  --color-flag-gold: #E2B324;
  --color-transparent: transparent;
  --rgb-electric: 163, 219, 15;
  --rgb-ink: 34, 29, 20;
  --rgb-paper: 255, 255, 255;
  --rgb-surface-soft: 238, 230, 211;
  --font-display: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, Consolas, 'Liberation Mono', monospace;
  --radius-small: 8px;
  --radius-medium: 12px;
  --radius-round: 999px;
  --container: 1200px;
  --reading-width: 780px;
  --gutter: 32px;
  --header-height: 72px;
  --section-space: 96px;
  --focus-size: 2px;
  --shadow-panel: 0 18px 40px -26px rgba(var(--rgb-electric), .38), 0 12px 24px -20px rgba(var(--rgb-ink), .18);
  --shadow-electric: 0 0 40px 4px rgba(var(--rgb-electric), .14), 0 0 96px 24px rgba(var(--rgb-electric), .08);
  --shadow-button: 0 10px 24px -10px rgba(var(--rgb-electric), .7);
  --transition-fast: 160ms ease;
  --toc-offset: 112px;
}

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

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

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  color: var(--color-ink);
  background:
    radial-gradient(ellipse 58% 30% at 50% 0%, rgba(var(--rgb-electric), .07), var(--color-transparent) 72%),
    linear-gradient(180deg, var(--color-page), var(--color-page));
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

img,
video,
canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

svg {
  flex-shrink: 0;
}

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

button,
summary {
  cursor: pointer;
}

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

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

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

ul[role='list'],
ol[role='list'],
.site-nav ul,
.footer-links,
.mobile-nav-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

h1,
.display-title,
.hero-title {
  margin: 0;
  font-size: clamp(52px, 5.2vw, 68px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.02em;
}

h2,
.section-title {
  margin: 0 0 20px;
  font-size: clamp(34px, 4vw, 48px);
  font-weight: 850;
  line-height: 1.16;
  letter-spacing: -.02em;
}

h3 {
  margin: 32px 0 12px;
  font-size: clamp(22px, 2.5vw, 28px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.01em;
}

h4 {
  margin: 24px 0 8px;
  font-size: 18px;
  line-height: 1.4;
}

small,
.meta {
  color: var(--color-ink-soft);
  font-size: 13px;
}

strong {
  font-weight: 750;
}

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

:not(pre) > code {
  overflow-wrap: anywhere;
  padding: .12em .38em;
  border: 1px solid var(--color-line);
  border-radius: 5px;
  background: var(--color-surface-soft);
  font-size: .9em;
}

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

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

hr {
  height: 1px;
  margin: 48px 0;
  border: 0;
  background: var(--color-line);
}

::selection {
  color: var(--color-ink);
  background: var(--color-electric-light);
}

:where(a, button, input, select, textarea, summary, [role='tab']):focus-visible {
  outline: var(--focus-size) solid var(--color-electric-dark);
  outline-offset: 3px;
}

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

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

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

.section-soft {
  border-block: 1px solid var(--color-line);
  background: rgba(var(--rgb-paper), .26);
}

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

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

.grid {
  display: grid;
  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));
}

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

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

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.surface,
.card,
.paper-panel {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  box-shadow: inset 0 1px 0 rgba(var(--rgb-paper), .7), var(--shadow-panel);
}

.card {
  padding: 24px;
}

.eyebrow,
.eyebrow-line {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-ink-soft);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
}

.eyebrow-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-electric);
  box-shadow: 0 0 0 3px rgba(var(--rgb-electric), .2);
}

.eyebrow-line::before {
  width: 22px;
  height: 3px;
  flex-shrink: 0;
  border-radius: var(--radius-round);
  background: var(--color-electric);
  content: '';
}

.highlight {
  display: inline-block;
  padding-inline: .14em;
  border-radius: var(--radius-small);
  background: linear-gradient(180deg, var(--color-electric-light), var(--color-electric));
  box-shadow: 0 8px 22px -10px rgba(var(--rgb-electric), .7);
  line-height: 1.02;
}

.badge,
.tag {
  display: inline-flex;
  min-height: 28px;
  max-width: 100%;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  padding: 4px 10px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-round);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
}

.badge-accent,
.tag-accent {
  border-color: var(--color-electric);
  background: rgba(var(--rgb-electric), .11);
  color: var(--color-ink);
}

.btn {
  display: inline-flex;
  min-width: 24px;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  border: 0;
  border-radius: var(--radius-small);
  font-size: 15px;
  font-weight: 750;
  line-height: 1.2;
  text-align: center;
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(180deg, var(--color-electric-light), var(--color-electric));
  color: var(--color-ink);
  box-shadow: inset 0 1px 0 rgba(var(--rgb-paper), .5), var(--shadow-button);
}

.btn-secondary {
  border: 1.5px solid var(--color-ink);
  background: var(--color-transparent);
  color: var(--color-ink);
}

.btn-secondary:hover {
  background: var(--color-surface);
}

.btn-soft {
  border: 1px solid var(--color-line);
  background: var(--color-surface-soft);
  color: var(--color-ink);
}

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

.site-header {
  position: relative;
  z-index: 30;
  min-height: var(--header-height);
}

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

.brand-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-link img {
  width: 28px;
  height: 28px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 850;
  letter-spacing: -.01em;
}

.brand-local {
  color: var(--color-ink-soft);
  font-size: 14px;
  font-weight: 600;
}

.site-nav {
  margin-left: 4px;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 6px 10px;
  border-radius: var(--radius-small);
  color: var(--color-ink-soft);
  font-size: 13.5px;
  font-weight: 550;
  white-space: nowrap;
}

.site-nav a svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.site-nav a:hover {
  color: var(--color-ink);
}

.site-nav a[aria-current='page'] {
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: inset 0 0 0 1px var(--color-line), 0 1px 0 rgba(var(--rgb-paper), .6);
  font-weight: 700;
}

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

.language-button,
.menu-button {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 10px;
  border: 0;
  border-radius: var(--radius-small);
  background: var(--color-transparent);
  color: var(--color-ink-soft);
}

.language-button svg,
.menu-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.header-login {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  padding: 7px 16px;
  border: 1.5px solid var(--color-ink);
  border-radius: var(--radius-small);
  background: var(--color-surface);
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 700;
}

.header-login:hover {
  background: var(--color-ink);
  color: var(--color-surface);
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 35;
  display: none;
  width: 180px;
  padding: 8px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--color-surface);
  box-shadow: var(--shadow-panel);
}

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

.language-menu a {
  display: flex;
  min-height: 40px;
  align-items: center;
  padding: 8px 10px;
  border-radius: 6px;
  color: var(--color-ink-soft);
  font-size: 13px;
}

.language-menu a:hover,
.language-menu a[aria-current='true'] {
  background: var(--color-surface-soft);
  color: var(--color-ink);
}

.menu-button {
  display: none;
}

.mobile-nav {
  position: fixed;
  top: var(--header-height);
  right: 0;
  left: 0;
  z-index: 32;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 12px var(--gutter) 24px;
  border-top: 1px solid var(--color-line);
  background: var(--color-surface);
  box-shadow: 0 20px 35px -24px rgba(var(--rgb-ink), .28);
}

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

.mobile-nav-list {
  display: grid;
  gap: 4px;
}

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 46px;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-small);
  color: var(--color-ink);
  font-weight: 650;
}

.mobile-nav a svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.mobile-nav a:hover,
.mobile-nav a[aria-current='page'] {
  background: var(--color-surface-soft);
}

.mobile-language {
  display: grid;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-line);
}

.mobile-language a {
  color: var(--color-ink-soft);
  font-size: 14px;
}

.mobile-language a[aria-current='true'] {
  color: var(--color-ink);
}

.nav-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 29;
  display: none;
  border: 0;
  background: rgba(var(--rgb-ink), .18);
}

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

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

.footer-main {
  display: grid;
  grid-template-columns: minmax(240px, 1.25fr) repeat(2, minmax(180px, 1fr));
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 44px;
}

.footer-brand p {
  max-width: 40ch;
  margin: 16px 0 0;
  color: var(--color-ink-soft);
  font-size: 14px;
}

.footer-title {
  margin: 0 0 14px;
  font-size: 14px;
  font-weight: 800;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 16px;
}

.footer-links a,
.footer-languages a {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  color: var(--color-ink-soft);
  font-size: 13px;
}

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

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

.footer-languages {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 18px;
  padding-bottom: 24px;
  border-top: 1px solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: 12px;
}

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

.reveal {
  transition: opacity 600ms ease, transform 600ms ease;
}

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

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

#server-status {
  position: relative;
  display: block;
  width: 100%;
  max-width: 100%;
  min-height: 1px;
  margin-bottom: 32px;
  overflow: hidden;
}

#server-status + * {
  margin-top: 0;
}

.prose {
  overflow-wrap: break-word;
}

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

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

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

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

.prose a:not(.btn) {
  color: var(--color-electric-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose blockquote {
  margin-inline: 0;
}

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

.tilt,
.tilt-card {
  transform: rotate(-.35deg);
}

@media (max-width: 1100px) {
  .site-nav a span {
    display: none;
  }

  .footer-main {
    grid-template-columns: 1.1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  :root {
    --section-space: 72px;
  }

  .site-nav {
    display: none;
  }

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

  .language-button {
    display: none;
  }

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

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

@media (max-width: 768px) {
  h1,
  .display-title,
  .hero-title {
    font-size: clamp(28px, 9.8vw, 40px);
    line-height: 1.12;
  }

  h2,
  .section-title {
    font-size: clamp(28px, 8vw, 36px);
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

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

  .footer-brand {
    grid-column: auto;
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 18px;
    --section-space: 56px;
  }

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

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

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

  .header-inner {
    gap: 10px;
  }

  .header-login {
    min-height: 40px;
    padding-inline: 12px;
  }

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

  .section,
  [class*='hero'],
  [class*='halo'],
  [class*='glow'],
  [class*='decor'] {
    max-width: 100%;
    overflow-x: clip;
  }

  .card {
    padding: 20px;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 380px) {
  :root {
    --gutter: 16px;
  }

  .brand-link {
    gap: 7px;
  }

  .brand-link img {
    width: 25px;
    height: 25px;
  }

  .header-login {
    padding-inline: 10px;
    font-size: 13px;
  }

  .menu-button {
    min-width: 40px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-duration: 0s;
  }

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

  .btn,
  .btn:hover {
    transform: none;
    transition: none;
  }
}