:root {
  --color-canvas: #F3F3F6;
  --color-surface: #FFFFFF;
  --color-surface-muted: #E9E9EF;
  --color-line: #D9D9E2;
  --color-brand: #C21690;
  --color-brand-deep: #8F0F6B;
  --color-link: #12A6CC;
  --color-warning: #E58A1F;
  --color-success: #1B9C6B;
  --color-danger: #D1323B;
  --color-text: #16161D;
  --color-text-muted: #5B5B6B;
  --color-on-brand: #FFFFFF;

  --color-ink: #15151B;
  --color-ink-raised: #1C1C24;
  --color-ink-control: #2B2B36;
  --color-ink-line: #30303C;
  --color-ink-text: #ECECF2;
  --color-ink-muted: #A6A6B3;
  --color-ink-highlight: rgba(255, 255, 255, 0.06);

  --color-brand-soft: rgba(194, 22, 144, 0.10);
  --color-link-soft: rgba(18, 166, 204, 0.10);
  --color-warning-soft: rgba(229, 138, 31, 0.12);
  --color-success-soft: rgba(27, 156, 107, 0.11);
  --color-danger-soft: rgba(209, 50, 59, 0.10);
  --color-glow-brand: rgba(194, 22, 144, 0.22);
  --color-glow-link: rgba(18, 166, 204, 0.22);
  --color-glow-warning: rgba(229, 138, 31, 0.18);
  --color-shadow-soft: rgba(22, 22, 29, 0.08);
  --color-shadow-deep: rgba(22, 22, 29, 0.16);
  --color-shadow-brand: rgba(194, 22, 144, 0.28);
  --color-overlay: rgba(22, 22, 29, 0.46);

  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, Consolas, 'Noto Sans SC', monospace;

  --radius-large: 24px;
  --radius-medium: 20px;
  --radius-small: 10px;
  --radius-tiny: 7px;
  --radius-pill: 999px;

  --shadow-soft: 0 12px 32px var(--color-shadow-soft);
  --shadow-card: 0 1px 2px var(--color-shadow-soft), 0 24px 56px var(--color-shadow-deep);
  --shadow-brand: 0 8px 22px var(--color-shadow-brand);

  --content-width: 1200px;
  --reading-width: 820px;
  --header-width: 1280px;
  --header-height: 64px;
  --gutter: clamp(16px, 3vw, 32px);
  --section-space: clamp(64px, 9vw, 112px);
  --transition-fast: 160ms ease;
  --transition-reveal: 600ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--color-canvas);
  color: var(--color-text);
  font: 400 16px/1.65 var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

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

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

img {
  height: auto;
}

button,
input,
select,
textarea {
  margin: 0;
  color: inherit;
  font: inherit;
}

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

button {
  cursor: pointer;
}

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

a:hover {
  text-decoration-thickness: 0.12em;
}

:focus-visible {
  outline: 2px solid var(--color-link);
  outline-offset: 3px;
  border-radius: var(--radius-tiny);
}

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

h1,
h2,
h3,
h4,
p,
ul,
ol,
dl,
blockquote,
pre,
figure,
table {
  margin-top: 0;
}

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

h1 {
  margin-bottom: 22px;
  font-size: clamp(34px, 4.2vw, 48px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 850;
  line-height: 1.18;
  letter-spacing: -0.02em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 750;
  line-height: 1.28;
  letter-spacing: -0.01em;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
}

p {
  margin-bottom: 1.15em;
}

strong {
  font-weight: 700;
}

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

:not(pre) > code {
  padding: 0.12em 0.35em;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-tiny);
  background: var(--color-surface-muted);
  color: var(--color-text);
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--color-ink-line);
  border-radius: var(--radius-medium);
  background: var(--color-ink);
  color: var(--color-ink-text);
  font: 400 14px/1.7 var(--font-mono);
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

pre code {
  color: inherit;
  font: inherit;
}

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

.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);
}

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

.section-white {
  background: var(--color-surface);
  color: var(--color-text);
}

.section-heading {
  max-width: 760px;
  margin-bottom: clamp(30px, 5vw, 54px);
}

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

.eyebrow {
  margin-bottom: 12px;
  color: var(--color-link);
  font: 600 12px/1.2 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nowrap-term {
  white-space: nowrap;
}

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

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

.panel,
.card {
  position: relative;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

.panel {
  padding: clamp(22px, 4vw, 42px);
}

.card {
  padding: clamp(20px, 3vw, 30px);
}

.card-accent {
  border-color: var(--color-brand);
}

.card-cyan {
  border-color: var(--color-link);
}

.card-warning {
  border-color: var(--color-warning);
}

.dark-panel {
  border: 1px solid var(--color-brand);
  border-radius: var(--radius-medium);
  background: var(--color-ink);
  color: var(--color-ink-text);
  box-shadow: var(--shadow-card);
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 22px;
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font: 650 15px/1.2 var(--font-body);
  text-align: center;
  text-decoration: none;
  transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

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

.button-primary:hover {
  border-color: var(--color-brand-deep);
  background: var(--color-brand-deep);
  color: var(--color-on-brand);
  transform: translateY(-1px);
}

.button-secondary {
  border-color: var(--color-line);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: 0 4px 14px var(--color-shadow-soft);
}

.button-secondary:hover {
  border-color: var(--color-link);
  background: var(--color-surface);
  color: var(--color-text);
  transform: translateY(-1px);
}

.button-link {
  min-height: 44px;
  padding-inline: 8px;
  background: transparent;
  color: var(--color-link);
}

.button:disabled,
.button.is-disabled {
  border-color: var(--color-line);
  background: var(--color-surface-muted);
  color: var(--color-text-muted);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

.site-topbar {
  position: sticky;
  top: 0;
  z-index: 80;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-text);
}

.site-topbar__inner {
  display: flex;
  width: 100%;
  max-width: min(100%, calc(var(--header-width) + var(--gutter) * 2));
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  align-items: center;
  gap: 26px;
}

.site-brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-decoration: none;
  white-space: nowrap;
}

.site-brand img {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

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

.desktop-nav > a,
.desktop-more__button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 8px 12px;
  border: 0;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--color-text);
  font: 550 15px/1 var(--font-body);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.desktop-nav > a:hover,
.desktop-more__button:hover {
  background: var(--color-canvas);
  color: var(--color-text);
}

.desktop-nav > a[aria-current="page"],
.desktop-more.is-current .desktop-more__button {
  color: var(--color-brand);
}

.desktop-more {
  position: relative;
}

.desktop-more__button svg,
.language-button svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.desktop-more:hover .desktop-more__button svg,
.desktop-more:focus-within .desktop-more__button svg,
.language-switcher.is-open .language-button svg {
  transform: rotate(180deg);
}

.desktop-more__menu,
.language-menu {
  position: absolute;
  top: calc(100% + 9px);
  min-width: 190px;
  padding: 6px;
  visibility: hidden;
  border: 1px solid var(--color-line);
  border-radius: 14px;
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
  opacity: 0;
  transform: translateY(-5px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}

.desktop-more__menu {
  left: 0;
}

.language-menu {
  right: 0;
}

.desktop-more:hover .desktop-more__menu,
.desktop-more:focus-within .desktop-more__menu,
.language-switcher.is-open .language-menu {
  visibility: visible;
  opacity: 1;
  transform: none;
}

.desktop-more__menu a,
.language-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--color-text);
  font-size: 14px;
  text-decoration: none;
}

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

.header-tools {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: 6px;
}

.language-switcher {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 10px;
  border: 0;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--color-text-muted);
  font: 550 14px/1 var(--font-body);
}

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

.language-button__short {
  display: none;
}

.header-download {
  display: inline-flex;
  min-height: 38px;
  margin-left: 8px;
  padding: 8px 18px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background: var(--color-brand);
  color: var(--color-on-brand);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.header-download:hover {
  background: var(--color-brand-deep);
  color: var(--color-on-brand);
}

.menu-toggle {
  display: none;
  width: 44px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
  padding: 10px;
  border: 0;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--color-text);
}

.menu-toggle:hover {
  background: var(--color-canvas);
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  border-radius: var(--radius-pill);
  background: var(--color-text);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  display: none;
}

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

.mobile-nav__panel {
  position: fixed;
  z-index: 82;
  top: var(--header-height);
  right: 0;
  left: 0;
  max-height: calc(100dvh - var(--header-height));
  padding: 10px var(--gutter) 24px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-top: 1px solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

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

.mobile-nav__label {
  padding: 18px 12px 7px;
  color: var(--color-text-muted);
  font: 600 11px/1.2 var(--font-mono);
  letter-spacing: 0.08em;
}

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  padding: 11px 12px;
  border-radius: var(--radius-small);
  color: var(--color-text);
  font-weight: 600;
  text-decoration: none;
}

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

.mobile-nav__download {
  margin-top: 8px;
  justify-content: center;
  background: var(--color-brand);
  color: var(--color-on-brand) !important;
}

.site-footer {
  margin-top: var(--section-space);
  border-top: 1px solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-text);
}

.site-footer__inner {
  width: 100%;
  max-width: calc(var(--content-width) + var(--gutter) * 2);
  margin-inline: auto;
  padding: 58px var(--gutter) 28px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.35fr) repeat(3, minmax(150px, 1fr));
  gap: 36px;
}

.footer-brand {
  max-width: 340px;
}

.footer-brand .site-brand {
  margin-bottom: 15px;
}

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

.footer-column h2 {
  margin-bottom: 14px;
  font: 700 14px/1.3 var(--font-body);
  letter-spacing: 0;
}

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

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

.footer-links a {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 14px;
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  margin-top: 42px;
  padding-top: 22px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--color-line);
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
}

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

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

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

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

.prose h2 {
  margin-top: 2.1em;
  scroll-margin-top: calc(var(--header-height) + 28px);
}

.prose h3 {
  margin-top: 1.7em;
  scroll-margin-top: calc(var(--header-height) + 28px);
}

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

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

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

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

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: var(--color-surface);
  color: var(--color-text);
}

.data-table th,
.data-table td {
  padding: 15px 18px;
  border-bottom: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: var(--color-surface-muted);
  color: var(--color-text);
  font-size: 13px;
  font-weight: 700;
}

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

.data-table tr:last-child td {
  border-bottom: 0;
}

[data-hero-visual],
.hero,
.hero-stage,
.decorated-section {
  overflow-x: clip;
}

.full-width-decoration {
  position: absolute;
  inset-inline: 0;
  pointer-events: none;
}

.full-width-decoration svg {
  width: 100%;
  height: 100%;
}

@media (max-width: 1040px) {
  .desktop-nav {
    display: none;
  }

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

  .menu-toggle {
    display: block;
  }

  .header-download {
    display: none;
  }

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7.4vw, 30px);
    line-height: 1.14;
  }

  h2 {
    font-size: clamp(24px, 6.4vw, 32px);
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .language-button__full {
    display: none;
  }

  .language-button__short {
    display: inline;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --header-height: 60px;
  }

  body {
    font-size: 15px;
  }

  .site-brand span {
    font-size: 15px;
  }

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

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .button-row .button {
    flex: 1 1 150px;
  }

  .panel,
  .card {
    border-radius: var(--radius-medium);
  }

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

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

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

@media (max-width: 390px) {
  .language-button {
    padding-inline: 7px;
  }

  .site-topbar__inner {
    gap: 8px;
  }

  .site-brand {
    gap: 7px;
  }
}

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

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

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