:root {
  --color-bg: #070b12;
  --color-bg-deep: #05080e;
  --color-panel: #101722;
  --color-panel-2: #182231;
  --color-panel-3: #202c3d;
  --color-border: #364252;
  --color-border-soft: rgba(244, 246, 248, 0.13);
  --color-border-bright: rgba(244, 246, 248, 0.24);
  --color-accent: #d6b15b;
  --color-accent-light: #f0d58f;
  --color-accent-dark: #9b7529;
  --color-accent-faint: rgba(214, 177, 91, 0.13);
  --color-accent-glow: rgba(214, 177, 91, 0.28);
  --color-text: #f4f6f8;
  --color-text-muted: #a9b2bf;
  --color-text-dim: #788493;
  --color-success: #72b89a;
  --color-success-faint: rgba(114, 184, 154, 0.14);
  --color-warn: #d6b15b;
  --color-error: #d86f68;
  --color-window-yellow: #d4a84f;
  --color-window-green: #72b89a;
  --color-glass: rgba(16, 23, 34, 0.78);
  --color-glass-strong: rgba(8, 13, 21, 0.88);
  --color-glass-light: rgba(244, 246, 248, 0.07);
  --color-glass-hover: rgba(244, 246, 248, 0.1);
  --color-overlay: rgba(7, 11, 18, 0.46);
  --color-overlay-strong: rgba(7, 11, 18, 0.86);
  --color-shadow: rgba(0, 0, 0, 0.58);
  --color-shadow-soft: rgba(0, 0, 0, 0.28);
  --color-navy-glow: rgba(27, 57, 91, 0.48);
  --color-navy-faint: rgba(35, 72, 112, 0.2);
  --color-grid: rgba(169, 178, 191, 0.035);
  --color-code: rgba(244, 246, 248, 0.06);
  --color-selection: rgba(214, 177, 91, 0.32);
  --color-transparent: transparent;

  --font-display: Inter, "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", system-ui, sans-serif;
  --font-body: Inter, "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, monospace;

  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;

  --shadow-header: 0 1px 0 var(--color-border-soft);
  --shadow-button: 0 10px 30px var(--color-accent-faint);
  --shadow-panel: 0 18px 50px var(--color-shadow-soft), inset 0 1px 0 var(--color-border-soft);
  --shadow-scene: 0 42px 100px var(--color-shadow), 0 12px 34px var(--color-shadow-soft);
  --shadow-window: 0 24px 70px var(--color-shadow), inset 0 1px 0 var(--color-border-bright);
  --shadow-dock: 0 12px 34px var(--color-shadow), inset 0 1px 0 var(--color-border-bright);

  --content-width: 1360px;
  --reading-width: 768px;
  --nav-height: 74px;
  --toc-height: 54px;
  --toc-sticky-top: var(--nav-height);
  --anchor-offset: calc(var(--nav-height) + var(--toc-height) + 22px);
  --gutter: clamp(16px, 3.4vw, 48px);
  --section-space: clamp(68px, 8vw, 116px);
  --transition-fast: 160ms ease;
  --transition-medium: 280ms ease;
}

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

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

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 0;
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background:
    linear-gradient(var(--color-grid) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-grid) 1px, var(--color-transparent) 1px),
    radial-gradient(ellipse at 50% 78%, var(--color-navy-glow), var(--color-transparent) 48%),
    linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-deep) 100%);
  background-size: 52px 52px, 52px 52px, auto, auto;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

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

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

button {
  border: 0;
}

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

iframe {
  max-width: 100%;
  border: 0;
}

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

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

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

h1 {
  margin-bottom: 24px;
  font-size: clamp(48px, 6vw, 76px);
  font-weight: 760;
  letter-spacing: -0.052em;
  line-height: 1.04;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 3.3vw, 46px);
  font-weight: 720;
  letter-spacing: -0.035em;
  line-height: 1.12;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(20px, 2vw, 27px);
  font-weight: 680;
  letter-spacing: -0.02em;
  line-height: 1.28;
}

h4 {
  margin-bottom: 10px;
  font-size: 17px;
  font-weight: 680;
  line-height: 1.4;
}

p {
  margin-bottom: 1.15em;
  color: var(--color-text-muted);
}

strong {
  color: var(--color-text);
  font-weight: 680;
}

small {
  color: var(--color-text-dim);
}

ul,
ol {
  padding-left: 1.35em;
  color: var(--color-text-muted);
}

li + li {
  margin-top: 0.45em;
}

hr {
  height: 1px;
  margin: 42px 0;
  border: 0;
  background: var(--color-border-soft);
}

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

:not(pre) > code {
  padding: 0.12em 0.38em;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-xs);
  color: var(--color-accent-light);
  background: var(--color-code);
  font-size: 0.88em;
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  background: var(--color-glass-strong);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

pre code {
  display: block;
  min-width: max-content;
  color: inherit;
  overflow-wrap: normal;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border-soft);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--color-text);
  font-size: 13px;
  font-weight: 680;
}

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

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: calc(var(--content-width) + (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 {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
  overflow-x: clip;
}

.section-compact {
  padding-top: clamp(44px, 6vw, 76px);
  padding-bottom: clamp(44px, 6vw, 76px);
  overflow-x: clip;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 38px;
}

.section-heading-centered {
  margin-inline: auto;
  text-align: center;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-kicker::before {
  width: 18px;
  height: 1px;
  flex: 0 0 auto;
  background: var(--color-accent);
  content: "";
}

.lead {
  max-width: 760px;
  color: var(--color-text-muted);
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.75;
}

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

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

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

.title-accent {
  color: var(--color-accent);
  background: linear-gradient(112deg, var(--color-accent-dark), var(--color-accent-light) 52%, var(--color-accent));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 12px 46px var(--color-accent-faint);
}

.eyebrow {
  display: inline-flex;
  max-width: 100%;
  min-height: 28px;
  align-items: center;
  gap: 9px;
  padding: 4px 12px;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  background: var(--color-glass);
  box-shadow: inset 0 1px 0 var(--color-border-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.055em;
}

.eyebrow-dot,
.status-dot,
.badge-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 10px var(--color-accent-glow);
}

.status-dot-success {
  background: var(--color-success);
  box-shadow: 0 0 10px var(--color-success);
}

.badge,
.tag,
.fact-pill {
  display: inline-flex;
  max-width: 100%;
  min-height: 28px;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  overflow: hidden;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  background: var(--color-glass-light);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.35;
  white-space: nowrap;
  text-overflow: ellipsis;
}

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

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

.button,
.hero-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 21px;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 680;
  line-height: 1.2;
  text-align: center;
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.button:hover,
.hero-button:hover {
  transform: translateY(-2px);
}

.button-primary,
.hero-button-primary {
  border-color: var(--color-accent);
  color: var(--color-bg-deep);
  background: var(--color-accent);
  box-shadow: var(--shadow-button), inset 0 1px 0 var(--color-accent-light);
}

.button-primary:hover,
.hero-button-primary:hover {
  background: var(--color-accent-light);
}

.button-secondary,
.hero-button-secondary {
  color: var(--color-text);
  background: var(--color-glass);
  box-shadow: inset 0 1px 0 var(--color-border-soft);
}

.button-secondary:hover,
.hero-button-secondary:hover {
  border-color: var(--color-text-dim);
  background: var(--color-glass-hover);
}

.button-quiet {
  color: var(--color-text-muted);
  background: var(--color-transparent);
}

.button-quiet:hover {
  color: var(--color-text);
  background: var(--color-glass-light);
}

.button-small {
  min-height: 38px;
  padding-inline: 16px;
  font-size: 13px;
}

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

.button-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 11px;
}

.panel,
.card {
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--color-glass-light), var(--color-transparent)), var(--color-panel);
  box-shadow: var(--shadow-panel);
}

.panel {
  padding: clamp(22px, 3vw, 34px);
}

.card {
  padding: 24px;
}

.glass-panel {
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-lg);
  background: var(--color-glass);
  box-shadow: var(--shadow-window);
  backdrop-filter: blur(24px) saturate(125%);
}

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

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

.prose h2 {
  margin-top: 2.1em;
}

.prose h3 {
  margin-top: 1.7em;
}

.prose a:not(.button) {
  color: var(--color-accent-light);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-dark);
  text-underline-offset: 0.2em;
}

.prose blockquote {
  margin: 28px 0;
  padding: 18px 22px;
  border-left: 3px solid var(--color-accent);
  color: var(--color-text-muted);
  background: var(--color-accent-faint);
}

.reveal {
  transition: opacity 520ms ease, transform 520ms ease;
}

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

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

.site-header {
  position: relative;
  z-index: 100;
  height: var(--nav-height);
  border-bottom: 1px solid var(--color-border-soft);
  background: var(--color-overlay);
  box-shadow: var(--shadow-header);
  backdrop-filter: blur(20px) saturate(125%);
}

.site-header-inner {
  position: relative;
  width: min(calc(100% - 48px), var(--content-width));
  height: 100%;
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 22px;
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  margin-right: auto;
}

.brand-mark {
  width: 31px;
  height: 31px;
  flex: 0 0 auto;
  filter: drop-shadow(0 0 12px var(--color-accent-glow));
}

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

.brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 730;
  letter-spacing: -0.02em;
}

.brand-local {
  color: var(--color-text-muted);
  font-size: 12px;
  font-weight: 520;
  letter-spacing: 0.02em;
}

.primary-nav {
  align-self: stretch;
  display: flex;
  align-items: stretch;
  gap: 2px;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 2px 9px 0;
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 520;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

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

.nav-link[aria-current="page"]::after {
  position: absolute;
  right: 10px;
  bottom: 0;
  left: 10px;
  height: 2px;
  border-radius: var(--radius-pill) var(--radius-pill) 0 0;
  background: var(--color-accent);
  box-shadow: 0 -3px 12px var(--color-accent-glow);
  content: "";
}

.nav-tools {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 8px;
}

.language-control {
  position: relative;
}

.language-switch {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  border: 1px solid var(--color-transparent);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  background: var(--color-transparent);
  cursor: pointer;
  font-size: 12px;
  white-space: nowrap;
}

.language-switch:hover,
.language-switch:focus-visible,
.language-switch[aria-expanded="true"] {
  border-color: var(--color-border-soft);
  color: var(--color-text);
  background: var(--color-glass-light);
}

.language-chevron {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-fast);
}

.language-switch[aria-expanded="true"] .language-chevron {
  transform: rotate(180deg);
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 168px;
  padding: 7px;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-window);
}

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

.language-menu a {
  display: flex;
  min-height: 40px;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.login-button {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  padding: 0 17px;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  background: var(--color-glass-light);
  box-shadow: inset 0 1px 0 var(--color-border-soft);
  font-size: 13px;
  font-weight: 630;
  white-space: nowrap;
}

.login-button:hover,
.login-button:focus-visible {
  border-color: var(--color-accent);
  background: var(--color-accent-faint);
}

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  background: var(--color-glass-light);
  cursor: pointer;
}

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

.mobile-drawer {
  display: none;
}

.nav-veil {
  display: none;
}

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

.footer-shell {
  display: grid;
  grid-template-columns: minmax(240px, 1.15fr) repeat(3, minmax(150px, 0.7fr));
  gap: 46px;
  padding-top: 66px;
  padding-bottom: 44px;
}

.footer-brand {
  max-width: 360px;
}

.footer-brand-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

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

.footer-brand p {
  margin-top: 18px;
  font-size: 14px;
}

.footer-heading {
  margin-bottom: 15px;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

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

.footer-links a {
  width: fit-content;
  max-width: 100%;
  color: var(--color-text-muted);
  font-size: 13px;
  overflow-wrap: anywhere;
}

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

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 21px;
  padding-bottom: 25px;
  border-top: 1px solid var(--color-border-soft);
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
}

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

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

@media (max-width: 1180px) {
  .site-header-inner {
    width: calc(100% - 32px);
  }

  .primary-nav {
    display: none;
  }

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

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

  .mobile-drawer {
    position: absolute;
    z-index: 8;
    top: var(--nav-height);
    right: 0;
    left: 0;
    display: none;
    max-height: calc(100dvh - var(--nav-height));
    padding: 12px var(--gutter) 20px;
    overflow-y: auto;
    overscroll-behavior: contain;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-panel);
    box-shadow: var(--shadow-window);
  }

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

  .mobile-drawer-list,
  .mobile-language-list {
    display: grid;
    gap: 3px;
  }

  .mobile-drawer a {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 14px;
  }

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

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

  .nav-veil {
    position: fixed;
    z-index: 1;
    inset: var(--nav-height) 0 0;
    background: var(--color-overlay-strong);
  }

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

@media (max-width: 760px) {
  :root {
    --nav-height: 66px;
    --toc-height: 50px;
  }

  h1 {
    font-size: clamp(40px, 12vw, 58px);
  }

  h2 {
    font-size: clamp(28px, 8vw, 38px);
  }

  .site-header-inner {
    width: 100%;
    padding-inline: var(--gutter);
    gap: 10px;
  }

  .brand-copy {
    gap: 5px;
  }

  .brand-local {
    display: none;
  }

  .language-switch {
    min-width: 38px;
    padding-inline: 8px;
  }

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

  .login-button {
    min-height: 40px;
    padding-inline: 13px;
  }

  .footer-shell {
    grid-template-columns: 1fr 1fr;
    gap: 34px 24px;
  }

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

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --section-space: 66px;
  }

  body {
    font-size: 15px;
  }

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

  .button-row,
  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button-row .button,
  .hero-actions .hero-button {
    width: 100%;
  }

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

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

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

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

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

@media (max-width: 390px) {
  .brand-mark {
    width: 28px;
    height: 28px;
  }

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

  .login-button {
    padding-inline: 10px;
    font-size: 12px;
  }

  .nav-tools {
    gap: 5px;
  }
}

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

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

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