:root {
  --color-bg: #F4F5F9;
  --color-bg-top: #F8F8FB;
  --color-bg-bottom: #EEF0F6;
  --color-panel: #FFFFFF;
  --color-panel-alt: #EAECF3;
  --color-border: #D9DCE7;
  --color-accent: #A3123F;
  --color-accent-dark: #6E0A2A;
  --color-coral: #F26E6B;
  --color-text: #14161F;
  --color-muted: #5B6075;
  --color-success: #1E8E5A;
  --color-warning: #C98A0B;
  --color-error: #D3461F;
  --color-glass: rgba(255, 255, 255, .62);
  --color-glass-strong: rgba(255, 255, 255, .84);
  --color-highlight: rgba(255, 255, 255, .92);
  --color-highlight-soft: rgba(255, 255, 255, .55);
  --color-shadow-tint: rgba(163, 18, 63, .12);
  --color-shadow-strong: rgba(163, 18, 63, .18);
  --color-shadow-ink: rgba(20, 22, 31, .1);
  --color-accent-soft: rgba(163, 18, 63, .08);
  --color-accent-glow: rgba(163, 18, 63, .085);
  --color-coral-glow: rgba(242, 110, 107, .16);
  --color-coral-faint: rgba(242, 110, 107, .05);
  --color-coral-edge: rgba(242, 110, 107, .22);
  --color-neutral-glow: rgba(217, 220, 231, .55);
  --color-separator: rgba(91, 96, 117, .55);
  --color-focus: #A3123F;
  --color-flag-red: #C9343E;
  --color-flag-blue: #2C3E8C;
  --color-flag-white: #FFFFFF;
  --color-flag-edge: rgba(20, 22, 31, .14);
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', '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', 'SFMono-Regular', Menlo, Consolas, 'Liberation Mono', monospace;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-pill: 999px;
  --site-width: 1216px;
  --reading-width: 760px;
  --gutter: 32px;
  --header-height: 76px;
  --space-section: 96px;
  --shadow-panel: 0 18px 44px -26px var(--color-shadow-tint);
  --shadow-raised: 0 24px 54px -24px var(--color-shadow-strong);
  --transition-fast: 160ms ease;
  --transition-medium: 360ms ease;
}

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

html {
  overflow-x: clip;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background: linear-gradient(180deg, var(--color-bg-top), var(--color-bg) 55%, var(--color-bg-bottom));
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

img,
video,
canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

svg {
  display: block;
  flex-shrink: 0;
}

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

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

button {
  border: 0;
  cursor: pointer;
}

ul,
ol {
  margin: 0;
}

ul[role="list"],
.site-nav-list,
.footer-links,
.mobile-nav-list {
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

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

h1 {
  margin-bottom: 24px;
  font-size: clamp(52px, 5vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(34px, 3.5vw, 48px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.02em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(21px, 2vw, 28px);
  line-height: 1.25;
  letter-spacing: -.01em;
}

p {
  margin-bottom: 1.25em;
  color: var(--color-muted);
}

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

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

:not(pre) > code {
  padding: .12em .35em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel-alt);
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-text);
  color: var(--color-panel);
  -webkit-overflow-scrolling: touch;
}

pre code {
  white-space: pre;
}

::selection {
  color: var(--color-panel);
  background: var(--color-accent);
}

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

.wrap {
  width: 100%;
  max-width: calc(var(--site-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(--space-section);
  padding-bottom: var(--space-section);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 40px;
}

.eyebrow {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  gap: 9px;
  margin-bottom: 18px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 700;
}

.eyebrow-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-coral));
  box-shadow: 0 0 0 5px var(--color-accent-soft);
}

.no-break {
  white-space: nowrap;
}

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

.text-gradient {
  color: transparent;
  background: linear-gradient(92deg, var(--color-accent), var(--color-accent-dark));
  background-clip: text;
  -webkit-background-clip: text;
}

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

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

.link-accent {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}

.link-accent:hover {
  color: var(--color-accent-dark);
}

.btn {
  display: inline-flex;
  min-width: 24px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.btn-primary {
  min-height: 48px;
  padding-inline: 28px;
  color: var(--color-panel);
  background: var(--color-text);
  box-shadow: inset 0 1px 0 var(--color-highlight-soft), 0 12px 24px -12px var(--color-shadow-ink);
}

.btn-primary:hover {
  transform: translateY(-1px);
  background: var(--color-accent);
  box-shadow: inset 0 1px 0 var(--color-highlight-soft), 0 14px 28px -12px var(--color-shadow-strong);
}

.btn-secondary {
  border-color: var(--color-border);
  background: var(--color-panel);
  box-shadow: inset 0 1px 0 var(--color-highlight), 0 4px 14px -10px var(--color-shadow-ink);
}

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

.btn-ghost {
  padding-inline: 4px;
  color: var(--color-accent);
  background: transparent;
}

.btn-ghost:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.btn[aria-disabled="true"],
.btn:disabled {
  cursor: not-allowed;
  opacity: .55;
  transform: none;
}

.panel,
.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: inset 0 1px 0 var(--color-highlight), var(--shadow-panel);
}

.panel {
  padding: 28px;
}

.card {
  padding: 24px;
}

.glass-panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-glass);
  box-shadow: inset 0 1px 0 var(--color-highlight), var(--shadow-raised);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.badge,
.tag {
  display: inline-flex;
  max-width: 100%;
  min-height: 26px;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  padding: 4px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text);
  background: var(--color-panel-alt);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.3;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.badge-accent {
  border-color: var(--color-accent);
  color: var(--color-panel);
  background: var(--color-accent);
}

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

.reveal {
  transition: opacity var(--transition-medium), transform var(--transition-medium);
}

.reveal.pending {
  opacity: 0;
  transform: translateY(16px);
}

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

.site-header {
  position: relative;
  z-index: 40;
}

.header-bar {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  flex: none;
}

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

.brand-word {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.02em;
}

.brand-zh {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 500;
}

.desktop-nav {
  display: flex;
  flex: 1;
  justify-content: center;
}

.site-nav-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.site-nav-list li {
  display: inline-flex;
  align-items: center;
}

.site-nav-list li + li::before {
  content: "·";
  margin-inline: 10px;
  color: var(--color-separator);
  font-weight: 700;
}

.site-nav-list a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  border-bottom: 1px solid transparent;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 500;
}

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

.site-nav-list a[aria-current="page"] {
  border-bottom-color: var(--color-accent);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.login-link {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  padding: 7px 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  font-size: 14px;
  font-weight: 700;
  box-shadow: inset 0 1px 0 var(--color-highlight), 0 3px 10px -7px var(--color-shadow-ink);
}

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

.language-switch {
  position: relative;
}

.language-button,
.menu-button {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  background: transparent;
}

.language-button:hover,
.menu-button:hover {
  color: var(--color-text);
  background: var(--color-panel-alt);
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 168px;
  padding: 7px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-raised);
}

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

.language-menu a {
  display: flex;
  min-height: 40px;
  align-items: center;
  width: 100%;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-size: 14px;
}

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

.menu-button {
  display: none;
}

.menu-lines,
.menu-lines::before,
.menu-lines::after {
  width: 20px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-text);
}

.menu-lines {
  position: relative;
}

.menu-lines::before,
.menu-lines::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-lines::before {
  top: -6px;
}

.menu-lines::after {
  top: 6px;
}

.mobile-nav {
  display: none;
}

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

.mobile-nav-panel {
  position: absolute;
  z-index: 42;
  top: var(--header-height);
  right: var(--gutter);
  left: var(--gutter);
  max-height: calc(100dvh - var(--header-height) - 16px);
  overflow-y: auto;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-raised);
  overscroll-behavior: contain;
}

.mobile-nav-list a {
  display: flex;
  width: 100%;
  min-height: 46px;
  align-items: center;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
}

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

.mobile-language-list {
  display: grid;
  gap: 2px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
}

.mobile-language-list a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 9px 12px;
  color: var(--color-muted);
  font-size: 14px;
}

.mobile-language-list a[aria-current="true"] {
  color: var(--color-accent);
  font-weight: 700;
}

.site-footer {
  position: relative;
  overflow-x: clip;
  margin-top: 72px;
  border-top: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--color-panel), var(--color-bg-bottom));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr 1fr;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 48px;
}

.footer-brand {
  max-width: 410px;
}

.footer-brandline {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
}

.footer-brandline img {
  width: 32px;
  height: 32px;
}

.footer-title {
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px 20px;
}

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

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

.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-languages {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin-top: 20px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 20px;
  padding-bottom: 28px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 13px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal a {
  min-height: 24px;
}

#server-status {
  position: relative;
  display: block;
  width: 100%;
  max-width: 100%;
  overflow: hidden;
  margin-bottom: 32px;
}

#server-status + * {
  margin-top: 32px;
}

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

.prose h2 {
  margin-top: 2.1em;
}

.prose h3 {
  margin-top: 1.7em;
}

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose li + li {
  margin-top: .55em;
}

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

@media (max-width: 1100px) {
  .desktop-nav {
    display: none;
  }

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

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

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
    --space-section: 72px;
  }

  h1 {
    font-size: clamp(32px, 9vw, 40px);
    line-height: 1.12;
  }

  h2 {
    font-size: clamp(28px, 7vw, 36px);
  }

  .language-switch {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

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

  .no-break {
    white-space: normal;
  }

  .tilt,
  .tilted,
  [data-tilt] {
    transform: none;
  }

  .header-bar {
    gap: 10px;
  }

  .brand-zh {
    display: none;
  }

  .login-link {
    padding-inline: 12px;
  }

  .mobile-nav-panel {
    right: var(--gutter);
    left: var(--gutter);
    max-width: calc(100% - (var(--gutter) * 2));
  }

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

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

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