:root {
  --color-canvas: #FFFFFF;
  --color-panel: #F7F8F7;
  --color-panel-strong: #F0F3F1;
  --color-line: #E2E7E4;
  --color-brand: #1E7A52;
  --color-brand-deep: #14573A;
  --color-ink: #1D3A2E;
  --color-ink-soft: #5E7169;
  --color-success: #2E8B57;
  --color-warning: #D98E32;
  --color-danger: #C2453A;
  --color-amber: #E8A24C;
  --color-amber-soft: #FBEFDC;
  --color-amber-ink: #7A4E14;
  --color-blue: #3B6FB5;
  --color-blue-soft: #EBF1F9;
  --color-green-soft: #E9F3EE;
  --color-white-text: #FFFFFF;
  --color-overlay: rgba(29, 58, 46, 0.34);
  --color-shadow-soft: rgba(29, 58, 46, 0.07);
  --color-shadow-mid: rgba(29, 58, 46, 0.11);
  --color-shadow-deep: rgba(29, 58, 46, 0.17);
  --color-brand-shadow: rgba(20, 87, 58, 0.45);
  --color-amber-shadow: rgba(122, 78, 20, 0.18);
  --font-display: Georgia, "Times New Roman", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
  --radius-pill: 999px;
  --radius-card: 16px;
  --radius-field: 10px;
  --radius-small: 7px;
  --shadow-far: 0 1px 2px var(--color-shadow-soft), 0 8px 18px var(--color-shadow-soft);
  --shadow-mid: 0 1px 3px var(--color-shadow-soft), 0 10px 24px var(--color-shadow-mid), 0 22px 44px -20px var(--color-shadow-deep);
  --shadow-near: 0 2px 4px var(--color-shadow-soft), 0 14px 30px var(--color-shadow-mid), 0 30px 60px -18px var(--color-shadow-deep);
  --shadow-hover: 0 4px 8px var(--color-shadow-soft), 0 20px 40px var(--color-shadow-mid), 0 36px 70px -18px var(--color-shadow-deep);
  --gutter: clamp(16px, 3vw, 28px);
  --content-width: 1120px;
  --header-width: 1280px;
  --header-height: 76px;
  --transition-fast: 150ms ease;
  --transition-reveal: 520ms ease;
}

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

html {
  scroll-behavior: smooth;
  background: var(--color-canvas);
}

html.nav-open {
  overflow: hidden;
}

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

main,
section,
article,
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,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  border: 0;
  cursor: pointer;
}

a {
  color: var(--color-brand-deep);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--color-brand);
}

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

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

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

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

:not(pre) > code {
  padding: 0.12em 0.35em;
  border-radius: var(--radius-small);
  background: var(--color-panel-strong);
  color: var(--color-brand-deep);
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border-radius: var(--radius-field);
  background: var(--color-ink);
  color: var(--color-white-text);
  line-height: 1.65;
  -webkit-overflow-scrolling: touch;
}

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

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

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

th {
  background: var(--color-panel-strong);
  color: var(--color-ink);
  font-weight: 600;
}

td {
  background: var(--color-canvas);
  color: var(--color-ink);
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.22;
  text-wrap: balance;
}

h1 {
  font-size: clamp(34px, 3.35vw, 48px);
  letter-spacing: 0.015em;
}

h2 {
  font-size: clamp(29px, 3vw, 40px);
}

h3 {
  font-size: clamp(23px, 2.2vw, 30px);
}

h4 {
  font-size: 21px;
}

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

.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: calc(var(--header-width) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-top: clamp(72px, 9vw, 128px);
  padding-bottom: clamp(72px, 9vw, 128px);
  overflow-x: clip;
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  background: var(--color-green-soft);
  color: var(--color-brand-deep);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.eyebrow::before {
  width: 6px;
  height: 6px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-brand);
  content: "";
}

.button,
.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

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

.button--primary,
.btn-fill {
  background: var(--color-brand);
  color: var(--color-white-text);
  box-shadow: 0 6px 16px -6px var(--color-brand-shadow);
}

.button--primary:hover,
.btn-fill:hover {
  background: var(--color-brand-deep);
  color: var(--color-white-text);
  transform: translateY(-1px);
}

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

.button--secondary:hover,
.btn-line:hover {
  border-color: var(--color-brand);
  color: var(--color-brand-deep);
}

.button--disabled,
.button:disabled {
  background: var(--color-panel-strong);
  color: var(--color-ink-soft);
  cursor: not-allowed;
  box-shadow: none;
}

.panel,
.card {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-ink);
}

.panel {
  padding: clamp(20px, 3vw, 34px);
}

.card {
  padding: 24px;
  box-shadow: var(--shadow-far);
}

.card:hover {
  box-shadow: var(--shadow-mid);
}

.split-rule {
  border-left: 1px solid var(--color-line);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
}

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

.site-header {
  position: relative;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
  color: var(--color-ink);
}

.site-header__row {
  width: 100%;
  max-width: min(100%, calc(var(--header-width) + var(--gutter) * 2));
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 22px;
}

.site-brand {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 11px;
  color: var(--color-ink);
  text-decoration: none;
}

.site-brand:hover {
  color: var(--color-brand-deep);
}

.site-brand img {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.site-brand__name {
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: 0.02em;
}

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

.desktop-nav a {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 7px;
  padding: 8px 10px;
  border-radius: var(--radius-pill);
  color: var(--color-ink-soft);
  font-size: 13.5px;
  text-decoration: none;
}

.desktop-nav a:hover {
  background: var(--color-panel);
  color: var(--color-brand-deep);
}

.desktop-nav a.is-active {
  background: var(--color-green-soft);
  color: var(--color-brand-deep);
}

.desktop-nav svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

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

.language-switch {
  position: relative;
}

.language-button {
  display: flex;
  min-height: 42px;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  color: var(--color-ink);
  white-space: nowrap;
}

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

.language-name-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 120;
  width: 180px;
  margin: 0;
  padding: 7px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-field);
  background: var(--color-canvas);
  box-shadow: var(--shadow-mid);
  list-style: none;
}

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

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 9px 12px;
  border-radius: var(--radius-small);
  color: var(--color-ink);
  text-decoration: none;
}

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

.menu-toggle {
  display: none;
  width: 44px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-panel);
  color: var(--color-ink);
}

.menu-toggle svg {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 1.8;
}

.mobile-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 80;
  background: var(--color-overlay);
}

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

.mobile-drawer {
  position: absolute;
  top: 100%;
  right: 0;
  left: 0;
  z-index: 110;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 10px var(--gutter) 20px;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
  box-shadow: var(--shadow-mid);
}

.mobile-drawer[hidden] {
  display: none;
}

.mobile-drawer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.mobile-drawer a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-field);
  color: var(--color-ink);
  text-decoration: none;
}

.mobile-drawer a:hover,
.mobile-drawer a.is-active {
  background: var(--color-green-soft);
  color: var(--color-brand-deep);
}

.mobile-drawer svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.mobile-languages {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--color-line);
}

.site-footer {
  padding-top: 72px;
  padding-bottom: 24px;
  background: var(--color-panel);
  color: var(--color-ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.35fr 0.8fr;
  gap: 44px;
}

.footer-brand p {
  max-width: 34ch;
  margin-top: 16px;
  color: var(--color-ink-soft);
}

.footer-heading {
  margin-bottom: 14px;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
}

.footer-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links li + li {
  margin-top: 8px;
}

.footer-links a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: 13px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

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

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

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

.prose h2 {
  margin-top: 2.2em;
  margin-bottom: 0.7em;
}

.prose h3 {
  margin-top: 1.8em;
  margin-bottom: 0.6em;
}

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

.tilt-soft {
  transform: rotate(-0.8deg);
}

@media (max-width: 1120px) {
  .desktop-nav a {
    padding-inline: 8px;
  }

  .desktop-nav a span {
    display: none;
  }
}

@media (max-width: 820px) {
  h1 {
    font-size: clamp(24px, 7vw, 30px);
  }

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

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

  .menu-toggle {
    display: flex;
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --header-height: 68px;
  }

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

  .site-brand__name {
    font-size: 18px;
  }

  .language-name-full {
    display: none;
  }

  .language-name-short {
    display: inline;
  }

  .button,
  .btn {
    max-width: 100%;
    padding-inline: 21px;
  }

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

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

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

  th,
  td {
    padding: 12px;
  }
}

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

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

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