:root {
  --color-page: #F2F7FE;
  --color-page-glow: #FBFDFF;
  --color-surface: #FFFFFF;
  --color-surface-soft: #E9F1FB;
  --color-border: #DCE6F2;
  --color-accent: #C13BD8;
  --color-accent-deep: #951FAD;
  --color-cyan: #35C3E8;
  --color-cyan-deep: #187FA6;
  --color-orange: #FF6A4D;
  --color-pink-soft: #FBE9F8;
  --color-blue-soft: #E3F4FB;
  --color-orange-soft: #FFEDE6;
  --color-ink: #14171F;
  --color-ink-soft: #3A4353;
  --color-muted: #5A6475;
  --color-success: #1E9E6A;
  --color-warning: #A66500;
  --color-error: #C82F2F;
  --color-board-left: #DEEBFA;
  --color-board-right: #C4D8EF;
  --color-grid: #E4EDF9;
  --color-cube-blue-top: #EDF8FD;
  --color-cube-blue-left: #BFE5F6;
  --color-cube-blue-right: #8FD3EF;
  --color-cube-orange-top: #FF8A70;
  --color-cube-orange-left: #FF6A4D;
  --color-cube-orange-right: #E0492F;
  --color-shadow: #2A4266;
  --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-large: 16px;
  --radius-medium: 12px;
  --radius-small: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 10px 30px rgba(28, 52, 94, 0.08);
  --shadow-raised: 0 14px 34px rgba(28, 52, 94, 0.14);
  --shadow-button: 0 8px 18px rgba(20, 23, 31, 0.16);
  --shadow-device: 0 22px 46px rgba(28, 52, 94, 0.15);
  --content-width: 1160px;
  --wide-width: 1380px;
  --gutter: clamp(16px, 3vw, 28px);
  --section-space: clamp(64px, 9vw, 112px);
  --header-height: 66px;
  --speed-fast: 160ms;
  --speed-normal: 280ms;
}

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

html {
  color-scheme: light;
  scroll-behavior: smooth;
  font-size: 16px;
}

html.nav-open {
  overflow: hidden;
}

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

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

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

img {
  height: auto;
}

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

button {
  border: 0;
}

a {
  color: var(--color-accent-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

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

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

nav ul,
.clean-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

h1 {
  margin-bottom: 1rem;
  font-size: clamp(34px, 4vw, 48px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.015em;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.012em;
}

h3 {
  margin-bottom: 0.75rem;
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 750;
  line-height: 1.3;
}

h4 {
  margin-bottom: 0.65rem;
  font-size: 1.05rem;
  font-weight: 750;
}

strong {
  color: var(--color-ink);
}

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

:not(pre) > code {
  overflow-wrap: anywhere;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-surface-soft);
  color: var(--color-ink);
  padding: 0.12em 0.38em;
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-ink);
  color: var(--color-surface);
  padding: 1.25rem;
  line-height: 1.65;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

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

hr {
  margin: 2rem 0;
  border: 0;
  border-top: 1px solid var(--color-border);
}

:focus-visible {
  outline: 3px solid var(--color-cyan);
  outline-offset: 3px;
}

::selection {
  background: var(--color-pink-soft);
  color: var(--color-ink);
}

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

.wrap-wide {
  width: 100%;
  max-width: calc(var(--wide-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-white {
  background: var(--color-surface);
  color: var(--color-ink);
}

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

.section-heading {
  max-width: 760px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

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

.eyebrow {
  margin-bottom: 0.75rem;
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.subtitle {
  max-width: 760px;
  color: var(--color-muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.7;
}

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

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

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

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

.panel {
  padding: clamp(22px, 4vw, 40px);
}

.card {
  padding: clamp(20px, 3vw, 28px);
}

.tint-pink {
  background: var(--color-pink-soft);
  color: var(--color-ink);
}

.tint-blue {
  background: var(--color-blue-soft);
  color: var(--color-ink);
}

.tint-orange {
  background: var(--color-orange-soft);
  color: var(--color-ink);
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: clamp(16px, 2.5vw, 28px);
}

.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));
}

.grid-2 > *,
.grid-3 > *,
.grid-4 > *,
.flex-row > * {
  min-width: 0;
}

.flex-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.button,
.btn-main,
.btn-ghost {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  border-radius: var(--radius-small);
  padding: 0.82rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 650;
  line-height: 1.2;
  letter-spacing: 0.07em;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: color var(--speed-fast), background var(--speed-fast), border-color var(--speed-fast), transform var(--speed-fast);
}

.button svg,
.btn-main svg,
.btn-ghost svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.button-primary,
.btn-main {
  border: 1px solid var(--color-ink);
  background: var(--color-ink);
  color: var(--color-surface);
  box-shadow: var(--shadow-button);
}

.button-primary:hover,
.btn-main:hover {
  border-color: var(--color-accent-deep);
  background: var(--color-accent-deep);
  color: var(--color-surface);
  transform: translateY(-1px);
}

.button-secondary,
.btn-ghost {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-ink);
}

.button-secondary:hover,
.btn-ghost:hover {
  border-color: var(--color-accent);
  background: var(--color-pink-soft);
  color: var(--color-accent-deep);
}

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

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

.badge,
.chip,
.fact-pill {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink);
  padding: 0.38rem 0.78rem;
  font-size: 0.78rem;
  font-weight: 650;
  line-height: 1.3;
}

.badge-dot,
.chip-dot,
.nav-icon,
.card-icon,
.platform-icon {
  flex-shrink: 0;
}

.badge-dot,
.chip-dot {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.badge-blue {
  background: var(--color-blue-soft);
  color: var(--color-ink);
}

.badge-pink {
  background: var(--color-pink-soft);
  color: var(--color-ink);
}

.badge-orange {
  background: var(--color-orange-soft);
  color: var(--color-ink);
}

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

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  color: var(--color-ink);
  font-size: 0.94rem;
}

.data-table th,
.data-table td {
  min-width: 140px;
  border: 1px solid var(--color-border);
  padding: 0.85rem 1rem;
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: var(--color-blue-soft);
  color: var(--color-ink);
  font-weight: 750;
}

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

.prose h2 {
  margin-top: 3.5rem;
  scroll-margin-top: 100px;
}

.prose h3 {
  margin-top: 2.3rem;
  scroll-margin-top: 100px;
}

.prose a {
  overflow-wrap: anywhere;
}

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

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 560ms ease, transform 560ms ease;
}

.reveal.shown {
  opacity: 1;
  transform: translateY(0);
}

.site-header {
  position: relative;
  z-index: 50;
  padding: 14px var(--gutter) 0;
}

.header-shell {
  width: 100%;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  min-height: var(--header-height);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
  padding: 8px 16px;
}

.site-brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
  text-decoration: none;
}

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

.site-brand img {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 3px;
  margin-left: auto;
}

.desktop-nav a,
.desktop-more-button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 7px;
  border-radius: var(--radius-small);
  padding: 0.6rem 0.72rem;
  background: var(--color-surface);
  color: var(--color-muted);
  font-size: 0.84rem;
  font-weight: 560;
  text-decoration: none;
  white-space: nowrap;
}

.desktop-nav a:hover,
.desktop-more-button:hover {
  background: var(--color-surface-soft);
  color: var(--color-ink);
}

.desktop-nav a.is-active,
.desktop-more.is-active > .desktop-more-button {
  background: var(--color-pink-soft);
  color: var(--color-accent-deep);
  font-weight: 700;
}

.nav-icon {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.desktop-more {
  position: relative;
}

.desktop-more-button {
  cursor: pointer;
}

.desktop-dropdown {
  position: absolute;
  top: calc(100% + 7px);
  right: 0;
  width: 190px;
  visibility: hidden;
  opacity: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: var(--shadow-raised);
  padding: 6px;
  transform: translateY(-5px);
  transition: opacity var(--speed-fast), transform var(--speed-fast), visibility var(--speed-fast);
}

.desktop-more:hover .desktop-dropdown,
.desktop-more:focus-within .desktop-dropdown {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}

.desktop-dropdown a {
  width: 100%;
}

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

.language-menu {
  position: relative;
}

.language-button,
.menu-toggle {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-surface);
  color: var(--color-muted);
  cursor: pointer;
}

.language-button {
  gap: 7px;
  min-width: 118px;
  padding: 0.55rem 0.72rem;
  font-size: 0.8rem;
  white-space: nowrap;
}

.language-button svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
}

.language-short {
  display: none;
}

.language-list {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 180px;
  visibility: hidden;
  opacity: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: var(--shadow-raised);
  padding: 6px;
  transform: translateY(-5px);
  transition: opacity var(--speed-fast), transform var(--speed-fast), visibility var(--speed-fast);
}

.language-menu.is-open .language-list {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}

.language-list a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  border-radius: var(--radius-small);
  padding: 0.65rem 0.75rem;
  color: var(--color-ink);
  text-decoration: none;
}

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

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

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

.mobile-veil {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: none;
  background: rgba(20, 23, 31, 0.28);
}

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

.mobile-drawer {
  position: absolute;
  top: calc(100% + 8px);
  right: var(--gutter);
  left: var(--gutter);
  z-index: 55;
  display: none;
  max-height: calc(100dvh - 94px);
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: var(--shadow-raised);
  padding: 8px;
}

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

.mobile-drawer a {
  display: flex;
  width: 100%;
  min-height: 46px;
  align-items: center;
  gap: 10px;
  border-radius: var(--radius-small);
  padding: 0.72rem 0.85rem;
  color: var(--color-ink);
  text-decoration: none;
}

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

.mobile-language-label {
  margin: 8px 10px 4px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
}

.mobile-language-links {
  border-top: 1px solid var(--color-border);
  margin-top: 6px;
  padding-top: 6px;
}

.site-footer {
  overflow-x: clip;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-ink);
  padding-top: 64px;
  padding-bottom: 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr 0.9fr;
  gap: 38px;
}

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

.footer-brand img {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.footer-intro {
  max-width: 330px;
  margin-top: 1rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.footer-title {
  margin-bottom: 1rem;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.13em;
}

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

.footer-links li + li {
  margin-top: 0.46rem;
}

.footer-links a {
  color: var(--color-muted);
  font-size: 0.88rem;
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--color-border);
  margin-top: 46px;
  padding-top: 20px;
  color: var(--color-muted);
  font-size: 0.82rem;
}

@media (max-width: 1180px) {
  .desktop-nav a,
  .desktop-more-button {
    padding-inline: 0.56rem;
  }

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

@media (max-width: 900px) {
  .desktop-nav {
    display: none;
  }

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

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

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

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7.5vw, 30px);
    line-height: 1.18;
    letter-spacing: -0.01em;
  }

  h2 {
    font-size: clamp(25px, 7vw, 32px);
  }

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

  .site-header {
    padding-top: 8px;
  }

  .header-shell {
    min-height: 60px;
    padding: 6px 8px 6px 12px;
  }

  .brand-name {
    font-size: 0.92rem;
  }

  .language-button {
    min-width: 58px;
  }

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

  .language-list {
    display: none;
  }

  .footer-grid {
    gap: 30px 24px;
  }
}

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

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

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

  .button-row .button,
  .button-row .btn-main,
  .button-row .btn-ghost {
    flex: 1 1 150px;
  }

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

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

  .footer-bottom {
    flex-direction: column;
  }

  .badge-row,
  .fact-row {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
  }
}

@media (max-width: 420px) {
  .brand-name {
    max-width: 118px;
    white-space: normal;
    line-height: 1.15;
  }

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

  .language-button {
    min-width: 48px;
    padding-inline: 0.45rem;
  }
}

@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;
  }
}