:root {
  --color-canvas: #FFFFFF;
  --color-panel: #F7F9F9;
  --color-panel-strong: #EEF3F2;
  --color-line: #E3E8E7;
  --color-accent: #12A594;
  --color-accent-deep: #0A6B60;
  --color-text: #14201E;
  --color-text-muted: #5C6B68;
  --color-success: #1C9E5A;
  --color-warning: #E8961E;
  --color-error: #D6453A;
  --color-cta: #D94E32;
  --color-cta-hover: #B93E28;
  --color-dark: #0C1615;
  --color-dark-raised: #111D1B;
  --color-dark-line: rgba(240, 248, 246, 0.14);
  --color-dark-glow: rgba(18, 165, 148, 0.15);
  --color-on-dark: #F2F8F6;
  --color-on-dark-muted: rgba(242, 248, 246, 0.72);
  --color-on-dark-faint: rgba(242, 248, 246, 0.46);
  --color-accent-strong: rgba(18, 165, 148, 0.72);
  --color-accent-medium: rgba(18, 165, 148, 0.45);
  --color-accent-soft: rgba(18, 165, 148, 0.26);
  --color-accent-wash: rgba(18, 165, 148, 0.12);
  --color-accent-halo: rgba(18, 165, 148, 0.28);
  --color-cta-shadow: rgba(185, 62, 40, 0.3);
  --color-shadow-soft: rgba(20, 32, 30, 0.08);
  --color-shadow-faint: rgba(20, 32, 30, 0.05);
  --color-shadow-dark: rgba(11, 21, 20, 0.34);
  --color-node-core: #E7FCF6;
  --color-code: #D9F6EF;
  --color-code-key: #7FE0D1;
  --color-code-string: #F4B39E;
  --font-display: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --radius-hero: 28px;
  --radius-card: 10px;
  --radius-small: 6px;
  --radius-pill: 999px;
  --shadow-card: 0 1px 2px var(--color-shadow-faint), 0 10px 28px var(--color-shadow-soft);
  --shadow-hero: 0 2px 6px var(--color-shadow-dark), 0 32px 70px -28px var(--color-shadow-dark);
  --shadow-cta: 0 2px 10px var(--color-cta-shadow);
  --content-width: 1120px;
  --header-width: 1280px;
  --gutter: clamp(16px, 4vw, 32px);
  --header-height: 72px;
  --transition-fast: 150ms ease;
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-canvas);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  -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 {
  color: inherit;
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-accent-soft);
  outline-offset: 3px;
}

p,
ul,
ol,
dl,
pre,
blockquote,
figure,
table {
  margin-top: 0;
  margin-bottom: 1.25em;
}

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

li::marker {
  color: var(--color-accent);
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 800;
  text-wrap: balance;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(34px, 4.2vw, 48px);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(27px, 3vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.015em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(20px, 2.2vw, 25px);
  line-height: 1.3;
}

h4 {
  margin-bottom: 8px;
  font-size: 17px;
  line-height: 1.4;
}

.title-keep {
  white-space: nowrap;
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: lowercase;
}

.eyebrow::before {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.text-link {
  color: var(--color-accent-deep);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

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

:not(pre) > code {
  padding: 0.12em 0.38em;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--color-panel);
  color: var(--color-text);
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  border: 1px solid var(--color-dark-line);
  border-radius: var(--radius-card);
  background: var(--color-dark);
  color: var(--color-code);
  line-height: 1.65;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

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

.code-key {
  color: var(--color-code-key);
}

.code-string {
  color: var(--color-code-string);
}

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

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

.section {
  padding-top: clamp(72px, 9vw, 120px);
  padding-bottom: clamp(72px, 9vw, 120px);
  overflow-x: clip;
}

.section + .section {
  border-top: 1px solid var(--color-line);
}

.section-head {
  max-width: 720px;
  margin-bottom: 42px;
}

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

.grid {
  display: grid;
  gap: 22px;
}

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

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

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

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

.panel {
  padding: clamp(22px, 4vw, 36px);
}

.card {
  padding: 24px;
}

.card-flat {
  box-shadow: none;
}

.card-mark {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 14px;
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
}

.card-mark::before {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.button {
  display: inline-flex;
  min-height: 46px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 22px;
  border: 1px solid var(--color-accent-deep);
  border-radius: var(--radius-card);
  background: var(--color-accent-deep);
  color: var(--color-on-dark);
  font-weight: 750;
  line-height: 1.3;
  text-align: center;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.button svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.button:hover {
  background: var(--color-dark);
  border-color: var(--color-dark);
  transform: translateY(-1px);
}

.button-primary {
  border-color: var(--color-cta);
  background: var(--color-cta);
  color: var(--color-on-dark);
  box-shadow: var(--shadow-cta);
}

.button-primary:hover {
  border-color: var(--color-cta-hover);
  background: var(--color-cta-hover);
}

.button-secondary {
  border-color: var(--color-line);
  background: var(--color-canvas);
  color: var(--color-text);
}

.button-secondary:hover {
  border-color: var(--color-accent);
  background: var(--color-panel);
  color: var(--color-text);
}

.button-dark-ghost {
  border-color: var(--color-on-dark-faint);
  background: var(--color-dark);
  color: var(--color-on-dark);
}

.button-dark-ghost:hover {
  border-color: var(--color-on-dark);
  background: var(--color-dark-raised);
}

.button[aria-disabled="true"],
.button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
  transform: none;
}

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

.site-header {
  position: relative;
  z-index: 100;
  width: 100%;
  background: var(--color-canvas);
  color: var(--color-text);
}

.header-bar {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  gap: 22px;
}

.brand-lockup {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
}

.brand-lockup img {
  width: 27px;
  height: 27px;
  flex-shrink: 0;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}

.desktop-nav a {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 6px;
  padding: 8px 9px;
  border-radius: var(--radius-small);
  color: var(--color-text-muted);
  font-size: 13px;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.desktop-nav a svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

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

.desktop-nav a[aria-current="page"] {
  font-weight: 700;
}

.header-tools {
  position: relative;
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 8px;
}

.language-toggle,
.menu-toggle {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  color: var(--color-text-muted);
}

.language-toggle {
  min-width: 112px;
  gap: 6px;
  padding: 8px 13px;
  white-space: nowrap;
}

.language-toggle:hover,
.menu-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 4;
  width: 178px;
  padding: 6px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-text);
  box-shadow: var(--shadow-card);
}

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

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 42px;
  align-items: center;
  padding: 8px 11px;
  border-radius: var(--radius-small);
}

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

.menu-toggle {
  display: none;
  min-width: 44px;
  padding: 0;
}

.menu-toggle svg {
  width: 20px;
  height: 20px;
}

.mobile-drawer {
  display: none;
}

.nav-veil {
  display: none;
}

.site-footer {
  margin-top: clamp(72px, 9vw, 120px);
  overflow-x: clip;
  background: var(--color-dark);
  color: var(--color-on-dark);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(230px, 1.35fr) repeat(3, minmax(150px, 1fr));
  gap: 42px;
  padding-top: 58px;
  padding-bottom: 42px;
}

.footer-brand p {
  max-width: 34em;
  margin-top: 17px;
  color: var(--color-on-dark-muted);
}

.footer-brand .brand-lockup {
  color: var(--color-on-dark);
}

.footer-column h2 {
  margin-bottom: 15px;
  color: var(--color-on-dark);
  font-size: 14px;
  letter-spacing: 0.02em;
}

.footer-links {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  color: var(--color-on-dark-muted);
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--color-on-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-top: 20px;
  padding-bottom: 25px;
  border-top: 1px solid var(--color-dark-line);
  color: var(--color-on-dark-muted);
  font-size: 13px;
}

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

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 520ms ease, transform 520ms ease;
}

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

.data-table {
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
}

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

.data-table th {
  background: var(--color-panel-strong);
  color: var(--color-text);
  font-weight: 750;
}

.data-table td {
  background: var(--color-canvas);
}

.table-scroll {
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.prose {
  min-width: 0;
}

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

.prose > h2 {
  margin-top: 2.2em;
}

.prose > h3 {
  margin-top: 1.8em;
}

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

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

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

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

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

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

@media (max-width: 1120px) {
  .desktop-nav {
    gap: 0;
  }

  .desktop-nav a {
    padding-inline: 7px;
  }
}

@media (max-width: 960px) {
  .desktop-nav {
    display: none;
  }

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

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

  .language-menu {
    display: none;
  }

  .mobile-drawer {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    z-index: 102;
    display: none;
    max-height: calc(100dvh - var(--header-height));
    padding: 10px var(--gutter) 22px;
    overflow-y: auto;
    overscroll-behavior: contain;
    border-top: 1px solid var(--color-line);
    background: var(--color-canvas);
    color: var(--color-text);
    box-shadow: var(--shadow-card);
  }

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

  .mobile-drawer a {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    gap: 10px;
    padding: 11px 8px;
    border-bottom: 1px solid var(--color-line);
    color: var(--color-text);
  }

  .mobile-drawer a svg {
    width: 17px;
    height: 17px;
    flex-shrink: 0;
    color: var(--color-accent-deep);
  }

  .mobile-language-title {
    margin: 20px 8px 4px;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-size: 12px;
  }

  .nav-veil {
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: 99;
    display: none;
    background: var(--color-shadow-dark);
  }

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

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

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7.5vw, 30px);
    line-height: 1.18;
  }

  h2 {
    font-size: clamp(24px, 6.5vw, 30px);
  }

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

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

@media (max-width: 640px) {
  :root {
    --header-height: 64px;
  }

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

  .brand-lockup {
    font-size: 15px;
  }

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

  .language-toggle {
    min-width: 58px;
    padding-inline: 10px;
  }

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

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

  .button-row .button {
    flex: 1 1 155px;
  }

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

  .footer-main {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }

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

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

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