:root {
  --color-ocean: #23507F;
  --color-ocean-top: #1D4269;
  --color-ocean-low: #2B6099;
  --color-curve-one: #26588C;
  --color-curve-two: #2B639B;
  --color-curve-three: #3170AB;
  --color-panel: #FFFFFF;
  --color-panel-soft: #F2F7FC;
  --color-border: #D8E3F0;
  --color-accent: #1B6FDB;
  --color-accent-dark: #0D4FA8;
  --color-accent-bright: #4FA3F7;
  --color-accent-soft: #E3EEFB;
  --color-text: #17273C;
  --color-text-muted: #5A7089;
  --color-success: #2FA96B;
  --color-warning: #EFAF3B;
  --color-error: #E15B5B;
  --color-pink: #F193B7;
  --color-white: #FFFFFF;
  --color-white-82: rgba(255, 255, 255, .82);
  --color-white-62: rgba(255, 255, 255, .62);
  --color-white-30: rgba(255, 255, 255, .30);
  --color-white-14: rgba(255, 255, 255, .14);
  --color-ocean-shadow-42: rgba(9, 26, 46, .42);
  --color-ocean-shadow-38: rgba(9, 26, 46, .38);
  --color-ocean-shadow-30: rgba(9, 26, 46, .30);
  --color-ocean-shadow-26: rgba(9, 26, 46, .26);
  --color-ocean-shadow-24: rgba(9, 26, 46, .24);
  --color-accent-shadow-38: rgba(13, 79, 168, .38);
  --color-text-shadow-28: rgba(23, 39, 60, .28);
  --color-black-08: rgba(23, 39, 60, .08);
  --color-black-12: rgba(23, 39, 60, .12);
  --color-black-18: rgba(23, 39, 60, .18);
  --font-display: Georgia, "Times New Roman", "Songti SC", "Noto Serif SC", "SimSun", serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
  --radius-small: 9px;
  --radius-medium: 18px;
  --radius-large: 24px;
  --radius-section: 32px;
  --radius-pill: 999px;
  --shadow-window: 0 30px 60px var(--color-ocean-shadow-38), 0 10px 24px var(--color-ocean-shadow-24);
  --shadow-phone: 0 24px 48px var(--color-ocean-shadow-42), 0 8px 18px var(--color-ocean-shadow-26);
  --shadow-button: 0 12px 26px var(--color-accent-shadow-38);
  --shadow-mark: 0 4px 10px var(--color-ocean-shadow-30);
  --shadow-card: 0 20px 50px var(--color-black-08), 0 5px 18px var(--color-black-08);
  --shadow-card-hover: 0 25px 60px var(--color-black-12), 0 8px 24px var(--color-black-08);
  --content-width: 1120px;
  --header-width: 1280px;
  --gutter: clamp(16px, 4vw, 40px);
  --section-space: clamp(72px, 10vw, 132px);
  --header-height: 72px;
  --transition-fast: 150ms ease;
  --transition-slow: 500ms ease;
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

html.nav-open {
  overflow: hidden;
}

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

body.hero-page {
  background: linear-gradient(180deg, var(--color-ocean-top) 0%, var(--color-ocean) 46%, var(--color-ocean-low) 100%);
  color: var(--color-white);
}

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

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

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

button {
  border: 0;
}

a {
  color: var(--color-accent-dark);
  text-decoration-thickness: .08em;
  text-underline-offset: .18em;
}

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

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

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

h1,
h2,
h3,
h4 {
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.18;
  margin-top: 0;
  text-wrap: balance;
}

h1 {
  font-size: clamp(34px, 4vw, 48px);
  letter-spacing: -.01em;
  margin-bottom: 24px;
}

h2 {
  font-size: clamp(30px, 3.3vw, 44px);
  margin-bottom: 22px;
}

h3 {
  font-size: clamp(23px, 2.4vw, 30px);
  margin-bottom: 16px;
}

h4 {
  font-family: var(--font-body);
  font-size: 19px;
  margin-bottom: 12px;
}

.title-nowrap,
.keyword {
  white-space: nowrap;
}

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

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

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

:not(pre) > code {
  background: var(--color-accent-soft);
  border-radius: var(--radius-small);
  color: var(--color-accent-dark);
  overflow-wrap: anywhere;
  padding: .12em .4em;
}

pre {
  background: var(--color-ocean-top);
  border-radius: var(--radius-medium);
  color: var(--color-white);
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  -webkit-overflow-scrolling: touch;
}

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

table {
  border-collapse: collapse;
  min-width: 640px;
  width: 100%;
}

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

th {
  background: var(--color-accent-soft);
  color: var(--color-text);
  font-weight: 700;
}

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 48px 0;
}

.wrap {
  margin-inline: auto;
  max-width: calc(var(--content-width) + var(--gutter) * 2);
  min-width: 0;
  padding-inline: var(--gutter);
  width: 100%;
}

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

.section {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

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

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

.rounded-section {
  border-radius: var(--radius-section) var(--radius-section) 0 0;
  overflow-x: clip;
}

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

.card {
  box-shadow: var(--shadow-card);
  padding: clamp(22px, 4vw, 38px);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.card-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 270px), 1fr));
}

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

.button,
.btn {
  align-items: center;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: inline-flex;
  font-size: 15.5px;
  font-weight: 700;
  gap: 9px;
  justify-content: center;
  min-height: 48px;
  padding: 12px 30px;
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

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

.button-primary,
.btn-primary {
  background: var(--color-accent);
  box-shadow: var(--shadow-button);
  color: var(--color-white);
}

.button-primary:hover,
.btn-primary:hover {
  background: var(--color-accent-dark);
  color: var(--color-white);
}

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

.button-secondary:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
}

.button-ghost,
.btn-ghost {
  background: transparent;
  border-color: var(--color-white-30);
  color: var(--color-white);
}

.button-ghost:hover,
.btn-ghost:hover {
  border-color: var(--color-white-82);
  color: var(--color-white);
}

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

.button[disabled],
.button.is-disabled {
  cursor: not-allowed;
  opacity: .55;
  transform: none;
}

.site-header {
  background: var(--color-ocean-top);
  color: var(--color-white);
  position: relative;
  z-index: 100;
}

.site-header__bar {
  align-items: center;
  display: flex;
  min-height: var(--header-height);
  width: 100%;
}

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

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

.site-brand__logo {
  flex-shrink: 0;
  height: 35px;
  width: 35px;
}

.site-brand__name {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .01em;
  white-space: nowrap;
}

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

.site-nav__list {
  align-items: center;
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__item {
  align-items: center;
  display: flex;
}

.site-nav__item + .site-nav__item::before {
  color: var(--color-white-62);
  content: "·";
  font-size: 15px;
  padding-inline: 13px;
}

.site-nav a {
  border-bottom: 2px solid transparent;
  color: var(--color-white-82);
  display: block;
  font-size: 15px;
  padding: 22px 2px 18px;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--color-white);
}

.site-nav a.is-active {
  border-bottom-color: var(--color-accent-bright);
  font-weight: 700;
}

.header-tools {
  align-items: center;
  display: flex;
  flex-shrink: 0;
  gap: 10px;
  margin-left: 26px;
}

.header-tool {
  align-items: center;
  background: transparent;
  border: 1px solid var(--color-white-30);
  border-radius: var(--radius-pill);
  color: var(--color-white-82);
  cursor: pointer;
  display: inline-flex;
  gap: 6px;
  justify-content: center;
  min-height: 38px;
  padding: 6px 15px;
  white-space: nowrap;
}

.header-tool:hover {
  border-color: var(--color-white-82);
  color: var(--color-white);
}

.header-tool__short {
  display: none;
}

.language-box {
  position: relative;
}

.language-menu {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  box-shadow: var(--shadow-card);
  color: var(--color-text);
  display: none;
  list-style: none;
  margin: 8px 0 0;
  min-width: 180px;
  padding: 8px;
  position: absolute;
  right: 0;
  top: 100%;
}

.language-box.is-open .language-menu {
  display: block;
}

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

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

.menu-toggle {
  align-items: center;
  background: transparent;
  border: 1px solid var(--color-white-30);
  border-radius: 50%;
  color: var(--color-white);
  cursor: pointer;
  display: none;
  height: 44px;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 0;
  width: 44px;
}

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

.mobile-veil {
  background: var(--color-ocean-shadow-42);
  display: none;
  inset: var(--header-height) 0 0;
  position: fixed;
  z-index: 90;
}

.mobile-drawer {
  background: var(--color-panel);
  color: var(--color-text);
  display: none;
  left: 0;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 10px var(--gutter) 24px;
  position: absolute;
  right: 0;
  top: 100%;
  z-index: 110;
}

.mobile-drawer__list,
.mobile-drawer__languages {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-drawer a {
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  display: flex;
  min-height: 48px;
  padding: 12px 4px;
  text-decoration: none;
  width: 100%;
}

.mobile-drawer a:hover,
.mobile-drawer a.is-active,
.mobile-drawer a[aria-current="true"] {
  color: var(--color-accent-dark);
}

.mobile-drawer__label {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  margin: 20px 0 5px;
  text-transform: uppercase;
}

.site-footer {
  background: linear-gradient(180deg, var(--color-ocean) 0%, var(--color-ocean-top) 100%);
  color: var(--color-white);
  overflow-x: clip;
  padding-top: 74px;
  padding-bottom: 28px;
}

.footer-grid {
  display: grid;
  gap: 50px;
  grid-template-columns: 1.3fr .8fr 1.2fr .8fr;
}

.footer-brand p {
  color: var(--color-white-82);
  margin-top: 18px;
  max-width: 32em;
}

.footer-title {
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: .12em;
  margin-bottom: 16px;
  text-transform: uppercase;
}

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

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

.footer-links a,
.footer-keywords a {
  color: var(--color-white-82);
  text-decoration: none;
}

.footer-links a:hover,
.footer-keywords a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.footer-keywords a {
  border: 1px solid var(--color-white-30);
  border-radius: var(--radius-pill);
  font-size: 13px;
  max-width: 100%;
  overflow-wrap: anywhere;
  padding: 6px 11px;
}

.footer-bottom {
  align-items: center;
  border-top: 1px solid var(--color-white-14);
  color: var(--color-white-62);
  display: flex;
  font-size: 13px;
  gap: 18px;
  justify-content: space-between;
  margin-top: 52px;
  padding-top: 24px;
}

.footer-bottom a {
  color: var(--color-white-82);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.tilt-left {
  transform: rotate(-1.4deg);
}

.tilt-right {
  transform: rotate(1.7deg);
}

.decorated-region {
  overflow-x: clip;
  position: relative;
}

.prose {
  font-size: 17px;
  min-width: 0;
}

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

.prose h2 {
  margin-top: 2.25em;
}

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

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

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

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    scroll-behavior: auto !important;
    transition: none !important;
  }

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

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

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

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

  .site-header.menu-open .mobile-drawer,
  .site-header.menu-open + .mobile-veil,
  .mobile-veil.is-open {
    display: block;
  }

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7.4vw, 30px);
    line-height: 1.2;
  }

  h2 {
    font-size: clamp(27px, 7vw, 34px);
  }

  .section {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .site-brand__name {
    font-size: 16px;
  }

  .language-box {
    display: none;
  }

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

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

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

  .header-tool__full {
    display: none;
  }

  .header-tool__short {
    display: inline;
  }

  .site-brand__logo {
    height: 32px;
    width: 32px;
  }

  .button,
  .btn {
    max-width: 100%;
    padding-inline: 22px;
  }

  .card {
    padding: 22px;
  }

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

  .card:hover {
    transform: none;
  }

  .prose {
    font-size: 16px;
  }
}

@media (max-width: 380px) {
  .site-brand__name {
    max-width: 7em;
    white-space: normal;
  }

  .header-tools {
    gap: 6px;
  }
}