:root {
  --color-page: #FFFFFF;
  --color-panel: #F7F6F3;
  --color-panel-strong: #EFEDE8;
  --color-line: #E8E5DF;
  --color-brand: #FF8533;
  --color-brand-deep: #E5602D;
  --color-coral: #FF5A5A;
  --color-ink: #1E1F24;
  --color-muted: #6B6D74;
  --color-success: #3DBE6C;
  --color-warning: #F2B13B;
  --color-error: #E5484D;
  --color-white-text: #FFFFFF;
  --color-overlay: rgba(30, 31, 36, 0.28);
  --color-glow-core: rgba(255, 133, 51, 0.22);
  --color-glow-mid: rgba(255, 133, 51, 0.10);
  --color-glow-clear: rgba(255, 133, 51, 0);
  --color-shadow-soft: rgba(60, 45, 30, 0.04);
  --color-shadow-medium: rgba(60, 45, 30, 0.06);
  --color-shadow-deep: rgba(60, 45, 30, 0.08);
  --color-focus: rgba(229, 96, 45, 0.28);
  --color-success-soft: rgba(61, 190, 108, 0.12);
  --color-error-soft: rgba(229, 72, 77, 0.11);
  --color-warning-soft: rgba(242, 177, 59, 0.15);

  --gradient-brand: linear-gradient(92deg, var(--color-brand) 0%, var(--color-coral) 100%);
  --gradient-brand-accessible: linear-gradient(92deg, #B83F18 0%, #B4232A 100%);
  --gradient-glow: radial-gradient(circle at 44% 40%, var(--color-glow-core) 0%, var(--color-glow-mid) 32%, var(--color-glow-clear) 66%);

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

  --radius-xl: 24px;
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;

  --shadow-window:
    0 2px 4px var(--color-shadow-soft),
    0 16px 32px var(--color-shadow-medium),
    0 48px 96px var(--color-shadow-deep);
  --shadow-card:
    0 1px 2px var(--color-shadow-soft),
    0 6px 14px var(--color-shadow-medium);
  --shadow-card-hover:
    0 2px 5px var(--color-shadow-soft),
    0 14px 28px var(--color-shadow-deep);
  --shadow-button: 0 8px 20px var(--color-focus);

  --header-height: 76px;
  --content-width: 1200px;
  --reading-width: 820px;
  --header-width: 1280px;
  --gutter: 32px;
  --section-space: clamp(72px, 9vw, 132px);
  --transition-fast: 180ms ease;
  --transition-reveal: 650ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  padding: 0;
  overflow-x: clip;
  background: var(--color-page);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

svg {
  flex-shrink: 0;
}

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

button {
  cursor: pointer;
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

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

ul,
ol {
  padding-left: 1.3em;
}

code {
  overflow-wrap: anywhere;
  font-family: var(--font-mono);
  font-size: 0.92em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  background: var(--color-ink);
  color: var(--color-white-text);
  font-family: var(--font-mono);
  line-height: 1.65;
  -webkit-overflow-scrolling: touch;
}

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

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

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

th {
  background: var(--color-panel);
  color: var(--color-ink);
  font-weight: 700;
}

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

h1 {
  margin-bottom: 24px;
  font-size: clamp(34px, 3.3vw, 48px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -0.018em;
  line-height: 1.18;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(21px, 2.3vw, 28px);
  font-weight: 750;
  line-height: 1.3;
}

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

p {
  margin-bottom: 1.15em;
}

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

.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);
}

.header-wrap {
  width: 100%;
  max-width: min(100%, calc(var(--header-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(52px, 7vw, 88px);
  padding-bottom: clamp(52px, 7vw, 88px);
}

.section-panel {
  border-radius: var(--radius-xl);
  padding: clamp(28px, 5vw, 64px);
  background: var(--color-panel);
  color: var(--color-ink);
}

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

.text-gradient {
  display: inline;
  background: var(--gradient-brand);
  color: transparent;
  background-clip: text;
  -webkit-background-clip: text;
}

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

.eyebrow {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 9px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  padding: 7px 14px 7px 11px;
  background: var(--color-page);
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.eyebrow-dot {
  position: relative;
  width: 8px;
  height: 8px;
  flex: 0 0 8px;
  border-radius: var(--radius-pill);
  background: var(--color-success);
}

.eyebrow-dot::after {
  position: absolute;
  inset: -4px;
  border: 2px solid var(--color-success);
  border-radius: var(--radius-pill);
  content: "";
  animation: status-breathe 2.4s ease-out infinite;
}

@keyframes status-breathe {
  0% {
    opacity: 0.6;
    transform: scale(0.55);
  }
  70%,
  100% {
    opacity: 0;
    transform: scale(1.25);
  }
}

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

.button {
  display: inline-flex;
  min-height: 50px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  padding: 10px 25px;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast);
}

.button svg {
  width: 18px;
  height: 18px;
}

.button.button-primary {
  background: var(--gradient-brand-accessible);
  color: var(--color-white-text);
  box-shadow: var(--shadow-button);
}

.button.button-primary:hover {
  transform: translateY(-2px);
}

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

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

.button-small {
  min-height: 42px;
  padding: 8px 18px;
  font-size: 14px;
}

.button[aria-disabled="true"],
.button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
  box-shadow: none;
}

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

.card {
  padding: clamp(22px, 3vw, 32px);
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.badge-row,
.platform-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.badge,
.platform-chip {
  display: inline-flex;
  min-height: 34px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 7px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  padding: 6px 11px;
  background: var(--color-page);
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 600;
}

.platform-chip {
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast);
}

.platform-chip:hover {
  border-color: var(--color-brand-deep);
  background: var(--color-panel);
  color: var(--color-ink);
}

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

.site-header {
  position: relative;
  z-index: 80;
  height: var(--header-height);
  background: var(--color-page);
  color: var(--color-ink);
}

.site-header-inner {
  display: flex;
  height: 100%;
  align-items: center;
  gap: 24px;
}

.site-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 750;
  letter-spacing: -0.01em;
}

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

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

.desktop-nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border-radius: var(--radius-pill);
  padding: 9px 11px;
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 550;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast);
}

.desktop-nav a svg {
  width: 16px;
  height: 16px;
  color: var(--color-muted);
}

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

.desktop-nav a[aria-current="page"],
.desktop-nav a[aria-current="page"] svg {
  color: var(--color-brand-deep);
}

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

.language-control {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  padding: 8px 13px;
  background: var(--color-page);
  color: var(--color-muted);
  font-size: 14px;
  white-space: nowrap;
}

.language-button svg {
  width: 15px;
  height: 15px;
}

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 174px;
  margin: 0;
  padding: 8px;
  list-style: none;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: var(--shadow-card-hover);
}

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

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 42px;
  align-items: center;
  border-radius: var(--radius-sm);
  padding: 8px 11px;
  color: var(--color-ink);
  font-size: 14px;
}

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

.header-download {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  background: var(--color-brand-deep);
  color: var(--color-white-text);
  font-size: 14px;
  font-weight: 700;
}

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  padding: 0;
  background: var(--color-page);
  color: var(--color-ink);
}

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

.mobile-nav {
  display: none;
}

.mobile-nav-veil {
  display: none;
}

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

.footer-main {
  display: grid;
  grid-template-columns: minmax(220px, 1.3fr) repeat(3, minmax(150px, 1fr));
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 52px;
}

.footer-brand {
  max-width: 330px;
}

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 750;
}

.footer-brand-link img {
  width: 38px;
  height: 38px;
}

.footer-brand p {
  color: var(--color-muted);
  font-size: 14px;
}

.footer-column h2 {
  margin-bottom: 15px;
  font-size: 14px;
  font-weight: 750;
  letter-spacing: 0;
}

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

.footer-links li + li {
  margin-top: 7px;
}

.footer-links a {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  color: var(--color-muted);
  font-size: 14px;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid var(--color-line);
  padding-top: 22px;
  padding-bottom: 26px;
  color: var(--color-muted);
  font-size: 13px;
}

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

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

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

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

.decorated-section,
.hero-shell,
.preview-hero {
  position: relative;
  overflow-x: clip;
}

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

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

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

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

.prose a {
  color: var(--color-brand-deep);
  text-decoration: underline;
  text-decoration-color: var(--color-brand);
  text-underline-offset: 0.2em;
}

.prose img {
  height: auto;
  border-radius: var(--radius-md);
}

.prose blockquote {
  margin-inline: 0;
}

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

.table-wrap table {
  min-width: 680px;
}

@media (max-width: 1120px) {
  :root {
    --gutter: 28px;
  }

  .desktop-nav a {
    padding-inline: 8px;
    font-size: 13px;
  }

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

  .header-download {
    display: none;
  }

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

@media (max-width: 860px) {
  :root {
    --header-height: 68px;
    --gutter: 22px;
  }

  h1 {
    font-size: clamp(26px, 6vw, 30px);
  }

  .desktop-nav {
    display: none;
  }

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

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

  .mobile-nav-veil {
    position: fixed;
    z-index: 70;
    inset: var(--header-height) 0 0;
    background: var(--color-overlay);
  }

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

  .mobile-nav {
    position: fixed;
    z-index: 90;
    top: var(--header-height);
    right: 0;
    left: 0;
    display: none;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
    padding: 12px var(--gutter) 20px;
    background: var(--color-page);
    color: var(--color-ink);
    box-shadow: var(--shadow-card-hover);
  }

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

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

  .mobile-nav a {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    gap: 10px;
    border-radius: var(--radius-sm);
    padding: 11px 12px;
    color: var(--color-ink);
    font-weight: 600;
  }

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

  .mobile-nav a svg {
    width: 18px;
    height: 18px;
  }

  .mobile-language-title {
    margin: 16px 12px 5px;
    color: var(--color-muted);
    font-size: 12px;
    font-weight: 700;
  }

  .mobile-language-links {
    border-top: 1px solid var(--color-line);
    padding-top: 7px;
  }

  .mobile-language-links a {
    min-height: 46px;
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 18px;
    --section-space: 68px;
  }

  body {
    font-size: 15px;
  }

  h1 {
    max-width: 100%;
    font-size: clamp(24px, 7.5vw, 30px);
    line-height: 1.18;
    letter-spacing: -0.015em;
  }

  h2 {
    font-size: clamp(26px, 8vw, 34px);
  }

  .site-header-inner {
    gap: 10px;
  }

  .site-brand {
    min-width: 0;
    flex: 1 1 auto;
    gap: 8px;
    font-size: 16px;
  }

  .site-brand span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

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

  .language-button {
    min-width: 48px;
    padding-inline: 10px;
  }

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

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

  .section-panel {
    padding: 24px 18px;
  }

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

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

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

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

  .footer-main {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding-top: 48px;
  }

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

  th,
  td {
    padding: 12px;
  }
}

@media (max-width: 380px) {
  :root {
    --gutter: 16px;
  }

  .site-brand span {
    max-width: 112px;
    line-height: 1.15;
  }

  .header-tools {
    gap: 5px;
  }

  .language-button {
    padding-inline: 8px;
  }
}

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

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

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