:root {
  --color-bg: #14121A;
  --color-panel: #1B1824;
  --color-panel-raised: #23202F;
  --color-border: #322D42;
  --color-accent: #C6A5FF;
  --color-accent-dark: #9468E8;
  --color-text: #F0EDF7;
  --color-text-muted: #A69FBA;
  --color-success: #6FD9A6;
  --color-warning: #F2C14E;
  --color-error: #F2708A;
  --color-button-ink: #17111F;
  --color-transparent: transparent;
  --color-overlay: rgba(20, 18, 26, 0.82);
  --color-border-soft: rgba(50, 45, 66, 0.45);
  --color-inset: rgba(240, 237, 247, 0.04);
  --color-accent-glow: rgba(198, 165, 255, 0.32);
  --color-accent-glow-strong: rgba(198, 165, 255, 0.55);
  --color-accent-haze: rgba(148, 104, 232, 0.26);
  --color-accent-haze-soft: rgba(148, 104, 232, 0.08);
  --color-success-glow: rgba(111, 217, 166, 0.8);
  --color-shadow: rgba(0, 0, 0, 0.65);
  --color-shadow-purple: rgba(20, 10, 40, 0.7);
  --color-focus-gap: #14121A;
  --font-display: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --header-height: 64px;
  --content-max: 1280px;
  --reading-max: 780px;
  --gutter: clamp(16px, 4vw, 32px);
  --section-space: clamp(72px, 9vw, 128px);
  --focus-width: 2px;
  --shadow-window: 0 1px 0 var(--color-inset) inset, 0 30px 60px -18px var(--color-shadow), 0 60px 120px -30px var(--color-shadow-purple);
  --shadow-card: 0 18px 48px -32px var(--color-shadow);
  --shadow-accent: 0 0 22px var(--color-accent-glow), 0 10px 26px -12px var(--color-accent-haze);
  --transition-fast: 150ms ease;
  --transition-reveal: 560ms cubic-bezier(0.22, 1, 0.36, 1);
  --toc-offset: 80px;
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  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: 16px;
  line-height: 1.7;
  -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,
summary {
  cursor: pointer;
}

button {
  border: 0;
}

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

p,
h1,
h2,
h3,
h4,
ul,
ol,
dl,
dd,
blockquote,
figure {
  margin-top: 0;
}

p:last-child,
ul:last-child,
ol:last-child,
blockquote:last-child {
  margin-bottom: 0;
}

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

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;
  letter-spacing: -0.015em;
  line-height: 1.12;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(32px, 3.6vw, 48px);
  font-weight: 780;
  letter-spacing: -0.01em;
  line-height: 1.18;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(21px, 2vw, 28px);
  font-weight: 720;
  line-height: 1.3;
}

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

strong {
  color: var(--color-text);
  font-weight: 650;
}

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

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

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  margin: 24px 0;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  padding: 18px;
  color: var(--color-text);
  line-height: 1.6;
  -webkit-overflow-scrolling: touch;
}

pre code {
  overflow-wrap: normal;
}

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

:where(a, button, summary, input, select, textarea, [tabindex]):focus-visible {
  outline: var(--focus-width) solid var(--color-accent);
  outline-offset: 3px;
}

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

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

.reading-wrap {
  width: 100%;
  max-width: calc(var(--reading-max) + (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(48px, 6vw, 80px);
  padding-bottom: clamp(48px, 6vw, 80px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 42px;
}

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

.eyebrow {
  margin-bottom: 12px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

.accent-text,
.hero-title .highlight {
  background: linear-gradient(120deg, var(--color-accent), var(--color-accent-dark));
  background-clip: text;
  color: var(--color-transparent);
  -webkit-background-clip: text;
}

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

.card {
  padding: clamp(20px, 3vw, 30px);
  box-shadow: var(--shadow-card);
}

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

.badge,
.chip {
  display: inline-flex;
  min-height: 28px;
  max-width: 100%;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  padding: 4px 12px;
  color: var(--color-text-muted);
  font-size: 12.5px;
  line-height: 1.45;
}

.badge-dot,
.status-dot {
  width: 6px;
  height: 6px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-success);
}

.status-dot.accent {
  background: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent-glow-strong);
}

.btn,
.btn-primary,
.btn-secondary,
.btn-login {
  display: inline-flex;
  min-width: 24px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-sm);
  padding: 0 24px;
  font-weight: 680;
  line-height: 1.2;
  transition: transform var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary {
  min-height: 48px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-dark));
  box-shadow: var(--shadow-accent);
  color: var(--color-button-ink);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 30px var(--color-accent-glow-strong), 0 14px 30px -12px var(--color-accent-haze);
}

.btn-secondary {
  min-height: 48px;
  border: 1px solid var(--color-border);
  background: var(--color-transparent);
  color: var(--color-text);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  background: var(--color-panel);
}

.btn-small {
  min-height: 38px;
  padding-inline: 18px;
  font-size: 13px;
}

.btn[aria-disabled="true"],
.btn-primary[aria-disabled="true"],
.btn-secondary[aria-disabled="true"],
button:disabled {
  cursor: not-allowed;
  filter: grayscale(1);
  opacity: 0.55;
  transform: none;
}

.top {
  position: relative;
  z-index: 100;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.top-in {
  display: flex;
  width: 100%;
  max-width: var(--content-max);
  height: var(--header-height);
  align-items: center;
  gap: 28px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.brand-logo {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.brand-name {
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-local {
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 520;
}

.nav {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav li {
  display: flex;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 13.5px;
}

.nav li:not(:last-child)::after {
  margin-inline: 12px;
  color: var(--color-border);
  content: "·";
  font-weight: 700;
}

.nav a {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  transition: color var(--transition-fast);
}

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

.nav a.on,
.nav a[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 650;
}

.top-tools {
  display: flex;
  flex: none;
  align-items: center;
  gap: 10px;
}

.btn-login {
  min-height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  padding-inline: 18px;
  color: var(--color-text);
  font-size: 13px;
}

.btn-login:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.lang-switch {
  position: relative;
}

.lang-button {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: var(--radius-sm);
  background: var(--color-transparent);
  color: var(--color-text-muted);
  font-size: 13px;
}

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  display: none;
  width: 164px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel-raised);
  padding: 6px;
  box-shadow: var(--shadow-card);
  list-style: none;
}

.lang-switch.open .lang-menu {
  display: block;
}

.lang-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  border-radius: var(--radius-xs);
  padding: 8px 10px;
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-text);
}

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

.mobile-nav {
  position: absolute;
  z-index: 102;
  top: var(--header-height);
  right: 0;
  left: 0;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
  padding: 10px var(--gutter) 18px;
  overscroll-behavior: contain;
}

.mobile-nav.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;
  border-bottom: 1px solid var(--color-border-soft);
  color: var(--color-text-muted);
  padding: 11px 4px;
}

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

.mobile-language-list {
  margin-top: 12px;
}

.mobile-language-list strong {
  display: block;
  padding: 8px 4px;
  color: var(--color-text-muted);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.nav-veil {
  position: fixed;
  z-index: 90;
  inset: var(--header-height) 0 0;
  display: none;
  background: var(--color-overlay);
}

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

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-panel);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(220px, 1.2fr) repeat(3, minmax(150px, 1fr));
  gap: clamp(28px, 5vw, 68px);
  padding-top: 64px;
  padding-bottom: 52px;
}

.footer-brand p {
  max-width: 340px;
  margin-top: 16px;
  color: var(--color-text-muted);
  font-size: 14px;
}

.footer-title {
  margin-bottom: 16px;
  color: var(--color-text);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

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

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

.footer-links a {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 13.5px;
}

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

.footer-bottom {
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 12.5px;
}

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

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

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

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

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

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

.prose h2,
.prose h3,
.prose h4 {
  color: var(--color-text);
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.prose h2 {
  margin-top: 64px;
}

.prose h3 {
  margin-top: 40px;
}

.prose a:not(.btn):not(.btn-primary):not(.btn-secondary) {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.prose blockquote {
  margin: 28px 0;
}

@media (max-width: 1080px) {
  .nav {
    display: none;
  }

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  h1 {
    font-size: clamp(28px, 9.6vw, 40px);
    line-height: 1.14;
  }

  h2 {
    font-size: clamp(27px, 8vw, 36px);
  }

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

  .lang-switch {
    display: none;
  }

  .brand-local {
    display: none;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 20px;
    padding-bottom: 20px;
  }
}

@media (max-width: 640px) {
  .prose :is(h2, h3, h4) .no-break {
    white-space: normal;
  }

  .wrap,
  .reading-wrap {
    padding-inline: var(--gutter);
  }

  .top-in {
    gap: 8px;
  }

  .brand-name {
    font-size: 16px;
  }

  .btn-login {
    min-width: 58px;
    padding-inline: 12px;
  }

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

  .footer-brand {
    grid-column: auto;
  }

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

  .btn,
  .btn-primary,
  .btn-secondary {
    max-width: 100%;
  }
}

@media (max-width: 380px) {
  .brand-logo {
    width: 25px;
    height: 25px;
  }

  .top-tools {
    gap: 5px;
  }

  .btn-login {
    min-width: 52px;
    padding-inline: 9px;
  }
}

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