:root {
  --color-bg: #FFFFFF;
  --color-panel: #F6F6F4;
  --color-panel-strong: #EDEDEA;
  --color-border: #E3E3DF;
  --color-accent: #B5E30E;
  --color-accent-deep: #6E8F00;
  --color-text: #191A15;
  --color-muted: #6C6E64;
  --color-success: #1F8A4C;
  --color-warning: #B8860B;
  --color-error: #C93A2E;
  --color-code-bg: #1D1E19;
  --color-code-line: #2B2C25;
  --color-code-key: #B8BAAF;
  --color-code-punctuation: #8C8E83;
  --color-code-string: #C9E85B;
  --color-dot: #E7E7E2;
  --color-overlay: rgba(25, 26, 21, 0.38);
  --color-shadow-soft: rgba(25, 26, 21, 0.07);
  --color-shadow-faint: rgba(25, 26, 21, 0.05);
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Courier New', monospace;
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 9px;
  --radius-pill: 999px;
  --shadow-soft: 0 18px 44px var(--color-shadow-soft);
  --shadow-faint: 0 10px 28px var(--color-shadow-faint);
  --content-width: 1180px;
  --header-width: 1280px;
  --reading-width: 820px;
  --header-height: 62px;
  --gutter: 32px;
  --section-space: 112px;
  --transition-fast: 150ms ease;
  --transition-main: 360ms cubic-bezier(.2, .7, .2, 1);
}

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

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

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body,
h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

ul[role="list"],
ol[role="list"],
.site-nav-list,
.footer-links {
  list-style: none;
}

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

svg[aria-hidden="true"] {
  flex-shrink: 0;
}

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

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

button {
  cursor: pointer;
}

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

p a,
.prose li a {
  color: var(--color-accent-deep);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

strong {
  font-weight: 650;
}

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

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

pre {
  max-width: 100%;
  margin: 24px 0;
  overflow-x: auto;
  border: 1px solid var(--color-code-line);
  border-radius: var(--radius-md);
  background: var(--color-code-bg);
  color: var(--color-code-key);
  padding: 20px;
  line-height: 1.75;
  -webkit-overflow-scrolling: touch;
}

pre code {
  color: inherit;
  white-space: pre;
}

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

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

th {
  background: var(--color-panel);
  color: var(--color-text);
  font-weight: 650;
}

td {
  background: var(--color-bg);
  color: var(--color-text);
}

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

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

.section-label {
  margin-bottom: 14px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4 {
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 500;
  text-wrap: balance;
}

h1,
.hero-title {
  font-size: clamp(34px, 4vw, 48px);
  line-height: 1.14;
  letter-spacing: -0.018em;
}

h2 {
  font-size: clamp(30px, 3.7vw, 46px);
  line-height: 1.18;
  letter-spacing: -0.015em;
}

h3 {
  font-size: clamp(21px, 2.2vw, 28px);
  line-height: 1.28;
}

h4 {
  font-size: 18px;
  line-height: 1.4;
}

.keyword-lock {
  white-space: nowrap;
}

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

.lede {
  max-width: 760px;
  color: var(--color-muted);
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.7;
}

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

.prose {
  min-width: 0;
  color: var(--color-text);
}

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

.prose h2 {
  margin-top: 72px;
}

.prose h3 {
  margin-top: 42px;
}

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

.prose li + li {
  margin-top: 9px;
}

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

.button-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  padding: 11px 25px;
  background: var(--color-bg);
  color: var(--color-text);
  font-weight: 650;
  line-height: 1.2;
  text-align: center;
  transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

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

.button:focus-visible,
.site-nav a:focus-visible,
.language-button:focus-visible,
.menu-toggle:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.button-primary {
  background: var(--color-accent);
  color: var(--color-text);
}

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

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

.button-dark {
  background: var(--color-text);
  color: var(--color-bg);
}

.button[aria-disabled="true"],
.button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
  transform: none;
}

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

.panel {
  padding: clamp(24px, 4vw, 48px);
}

.card {
  padding: 24px;
}

.card-interactive {
  transition: border-color var(--transition-fast);
}

.card-interactive:hover {
  border-color: var(--color-text);
}

.chip-row,
.badge-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.chip,
.badge {
  display: inline-flex;
  max-width: 100%;
  min-height: 30px;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-muted);
  padding: 4px 11px;
  font-size: 12px;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

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

.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 7px;
  border-radius: 50%;
  background: var(--color-accent);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 620ms ease, transform 620ms ease;
}

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

/* Header */
.site-header {
  position: relative;
  z-index: 100;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
}

.header-shell {
  display: flex;
  width: 100%;
  max-width: min(100%, calc(var(--header-width) + var(--gutter) * 2));
  min-height: var(--header-height);
  align-items: center;
  gap: 34px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-brand {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 10px;
  font-size: 16.5px;
  font-weight: 650;
}

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

.desktop-nav {
  min-width: 0;
}

.site-nav-list {
  display: flex;
  align-items: center;
  gap: 27px;
}

.site-nav a {
  display: flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-muted);
  font-size: 14.5px;
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a.is-active,
.site-nav a[aria-current="page"] {
  color: var(--color-text);
}

.site-nav a.is-active,
.site-nav a[aria-current="page"] {
  font-weight: 650;
}

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

.language-button,
.menu-toggle {
  min-height: 44px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-muted);
}

.language-button {
  border-radius: var(--radius-pill);
  padding: 7px 14px;
  white-space: nowrap;
}

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

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 104;
  width: 178px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: var(--shadow-faint);
}

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

.language-menu a {
  display: flex;
  min-height: 44px;
  width: 100%;
  align-items: center;
  padding: 9px 14px;
  color: var(--color-muted);
}

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

.menu-toggle {
  display: none;
  min-width: 44px;
  padding: 9px;
  border-radius: 50%;
}

.menu-bars,
.menu-bars::before,
.menu-bars::after {
  display: block;
  width: 19px;
  height: 1.5px;
  background: var(--color-text);
  content: "";
}

.menu-bars {
  position: relative;
}

.menu-bars::before {
  position: absolute;
  top: -6px;
}

.menu-bars::after {
  position: absolute;
  top: 6px;
}

.mobile-nav {
  display: none;
}

.nav-veil {
  display: none;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  padding-top: 72px;
  padding-bottom: 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.35fr 1fr;
  gap: 48px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
}

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

.footer-note {
  max-width: 290px;
  margin-top: 16px;
  color: var(--color-muted);
}

.footer-heading {
  margin-bottom: 14px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 650;
}

.footer-links {
  display: grid;
  gap: 7px;
}

.footer-links a {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  color: var(--color-muted);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 56px;
  border-top: 1px solid var(--color-border);
  padding-top: 22px;
  color: var(--color-muted);
  font-size: 13px;
}

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

/* Preview hero and product mock */
.preview-hero {
  position: relative;
  overflow-x: clip;
  background-color: var(--color-bg);
  background-image: radial-gradient(var(--color-dot) 1px, transparent 1px);
  background-size: 22px 22px;
  padding-top: 34px;
  padding-bottom: 78px;
}

.hero-copy {
  position: relative;
  z-index: 4;
}

.hero-copy h1 {
  margin-top: 16px;
}

.hero-copy .lede {
  margin-top: 14px;
}

.hero-copy .button-row {
  margin-top: 24px;
}

.hero-badges {
  margin-top: 22px;
}

.platform-chip,
.flag-chip {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 6px 13px;
  font-size: 12.5px;
}

.platform-chip svg {
  width: 15px;
  height: 15px;
}

.flag-chip svg {
  width: 21px;
  height: 14px;
  border-radius: 3px;
}

.product-stage {
  position: relative;
  min-width: 0;
  margin-top: 34px;
  padding-bottom: 58px;
}

.product-window {
  position: relative;
  z-index: 2;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: var(--shadow-faint);
}

.window-bar {
  position: relative;
  display: flex;
  height: 42px;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  padding-inline: 18px;
}

.window-dots {
  display: flex;
  gap: 7px;
}

.window-dots i {
  width: 10px;
  height: 10px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-panel-strong);
}

.window-title {
  position: absolute;
  left: 50%;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  transform: translateX(-50%);
}

.window-body {
  display: grid;
  min-height: 352px;
  grid-template-columns: 272px minmax(0, 1fr);
}

.window-sidebar {
  border-right: 1px solid var(--color-border);
  background: var(--color-panel);
  padding-top: 16px;
  padding-bottom: 14px;
}

.mock-caption {
  padding-inline: 20px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.mock-group {
  margin-top: 8px;
  margin-bottom: 15px;
}

.mock-nav-row,
.mock-server {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 8px;
  padding: 7px 20px;
  color: var(--color-muted);
  font-size: 13px;
}

.mock-nav-row.active {
  background: var(--color-panel-strong);
  color: var(--color-text);
  font-weight: 650;
}

.mock-server {
  position: relative;
  color: var(--color-text);
}

.mock-server.active {
  background: var(--color-bg);
}

.mock-server.active::before {
  position: absolute;
  inset-block: 6px;
  left: 0;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--color-accent);
  content: "";
}

.mock-server small {
  margin-left: auto;
  color: var(--color-muted);
  font-family: var(--font-mono);
}

.mock-main {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 22px 30px 14px;
}

.setting-row {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--color-border);
  padding: 13px 0;
}

.setting-copy {
  min-width: 0;
}

.setting-copy b {
  display: block;
  font-size: 14px;
}

.setting-copy small {
  color: var(--color-muted);
}

.segmented {
  display: inline-flex;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 3px;
}

.segmented span {
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  padding: 4px 12px;
  font-size: 12px;
}

.segmented .active {
  background: var(--color-accent);
  color: var(--color-text);
  font-weight: 650;
}

.toggle {
  position: relative;
  width: 38px;
  height: 22px;
  flex: 0 0 38px;
  border: 1px solid var(--color-text);
  border-radius: var(--radius-pill);
  background: var(--color-text);
}

.toggle::after {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-bg);
  content: "";
}

.select-mock,
.mini-action {
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
}

.select-mock {
  border-radius: var(--radius-sm);
  padding: 6px 13px;
  font-family: var(--font-mono);
}

.mini-action {
  border-radius: var(--radius-pill);
  padding: 6px 15px;
}

.mock-status {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding-top: 16px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.config-card {
  position: absolute;
  z-index: 3;
  bottom: 6px;
  left: -6px;
  width: 318px;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-code-bg);
  color: var(--color-code-key);
  box-shadow: var(--shadow-soft);
}

.config-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--color-code-line);
  padding: 9px 15px;
  font-family: var(--font-mono);
  font-size: 11px;
}

.config-card pre {
  margin: 0;
  border: 0;
  border-radius: 0;
  padding: 12px 16px;
  font-size: 11px;
}

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

.phone-card {
  position: absolute;
  z-index: 4;
  right: -4px;
  bottom: -16px;
  width: 238px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: 24px;
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

.phone-head,
.phone-row {
  display: flex;
  align-items: center;
}

.phone-head {
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  padding: 13px 16px;
}

.phone-row {
  gap: 9px;
  padding: 9px 16px;
  font-size: 12px;
}

.phone-row.active {
  background: var(--color-panel);
}

.phone-row small {
  margin-left: auto;
  color: var(--color-muted);
  font-family: var(--font-mono);
}

.phone-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 11px;
  text-align: center;
}

.phone-tabs span {
  padding: 9px 2px;
}

.phone-tabs .active {
  color: var(--color-text);
  font-weight: 650;
}

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

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

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

@media (max-width: 980px) {
  :root {
    --gutter: 24px;
  }

  .desktop-nav {
    display: none;
  }

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

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .mobile-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    z-index: 103;
    display: none;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    color: var(--color-text);
    padding: 12px var(--gutter) 24px;
  }

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

  .mobile-nav ul {
    list-style: none;
  }

  .mobile-nav a {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-muted);
    padding: 10px 4px;
  }

  .mobile-nav a.is-active,
  .mobile-nav a[aria-current="page"] {
    color: var(--color-text);
    font-weight: 650;
  }

  .mobile-language-title {
    margin-top: 18px;
    color: var(--color-muted);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.08em;
  }

  .nav-veil {
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: 90;
    background: var(--color-overlay);
  }

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

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

@media (max-width: 768px) {
  h1,
  .hero-title {
    font-size: clamp(24px, 7vw, 30px);
    line-height: 1.2;
  }

  h2 {
    font-size: clamp(26px, 7vw, 34px);
  }

  .window-body {
    grid-template-columns: 190px minmax(0, 1fr);
  }

  .mock-main {
    padding-inline: 20px;
  }

  .setting-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .config-card {
    width: min(285px, 72%);
  }

  .phone-card {
    width: 210px;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --section-space: 72px;
  }

  .header-shell {
    gap: 10px;
  }

  .site-brand {
    min-width: 0;
  }

  .site-brand span {
    font-size: 14px;
  }

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

  .language-button {
    min-width: 44px;
    padding-inline: 11px;
  }

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

  .button-row .button {
    flex: 1 1 160px;
  }

  .chip-row,
  .badge-row {
    flex-direction: row;
    align-items: center;
  }

  .panel,
  .card {
    transform: none !important;
  }

  [class*="tilt"] {
    transform: none !important;
  }

  .window-body {
    display: block;
  }

  .window-sidebar {
    display: none;
  }

  .mock-main {
    min-height: 330px;
    padding: 18px 16px 120px;
  }

  .segmented {
    max-width: 100%;
    flex-wrap: wrap;
  }

  .segmented span {
    padding-inline: 9px;
  }

  .product-stage {
    padding-bottom: 104px;
  }

  .config-card {
    bottom: 10px;
    left: 0;
    width: min(272px, 82%);
  }

  .phone-card {
    right: 0;
    bottom: -42px;
    width: min(200px, 62%);
  }

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

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

  th,
  td {
    min-width: 140px;
    padding-inline: 12px;
  }
}