:root {
  --color-bg: #171216;
  --color-panel: #1F181E;
  --color-panel-raised: #281F26;
  --color-border: #3B2E38;
  --color-accent: #FF6B9B;
  --color-accent-dark: #D94879;
  --color-accent-light: #FFB8CF;
  --color-text: #F5EEF2;
  --color-text-muted: #A99CA5;
  --color-success: #57D9A3;
  --color-warning: #FFC966;
  --color-error: #FF6B6B;
  --color-lavender: #B9A7FF;
  --color-flag-red: #D6362E;
  --color-flag-red-deep: #B3242B;
  --color-flag-blue: #2E4A9E;
  --color-flag-navy: #25366B;
  --color-flag-white: #F7F4F5;
  --color-transparent: transparent;
  --color-header: rgba(23, 18, 22, 0.82);
  --color-overlay: rgba(10, 6, 9, 0.72);
  --color-accent-soft: rgba(255, 107, 155, 0.14);
  --color-accent-line: rgba(255, 107, 155, 0.22);
  --color-accent-glow: rgba(255, 107, 155, 0.32);
  --color-lavender-soft: rgba(185, 167, 255, 0.14);
  --color-lavender-line: rgba(185, 167, 255, 0.28);
  --color-lavender-glow: rgba(185, 167, 255, 0.40);
  --color-mint-soft: rgba(87, 217, 163, 0.13);
  --color-mint-line: rgba(87, 217, 163, 0.28);
  --color-mint-glow: rgba(87, 217, 163, 0.40);
  --color-white-line: rgba(255, 255, 255, 0.04);
  --color-white-line-strong: rgba(255, 255, 255, 0.09);
  --color-shadow: rgba(10, 6, 9, 0.40);
  --color-shadow-heavy: rgba(10, 6, 9, 0.58);
  --color-focus-offset: #171216;
  --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", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius-xs: 8px;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;
  --shadow-panel: 0 18px 44px var(--color-shadow);
  --shadow-button: 0 10px 32px var(--color-accent-glow);
  --shadow-float: 0 22px 64px var(--color-shadow-heavy);
  --page-width: 1288px;
  --reading-width: 780px;
  --gutter: 32px;
  --header-height: 68px;
  --section-space: 96px;
  --toc-offset: 84px;
  --transition-fast: 150ms ease;
  --transition-base: 220ms ease;
}

*,
*::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: 15px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  z-index: 0;
  inset: 0;
  pointer-events: none;
  content: "";
  opacity: 0.05;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='140' height='140'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.92' numOctaves='2' stitchTiles='stitch'/></filter><rect width='140' height='140' filter='url(%23n)'/></svg>");
  background-size: 140px 140px;
}

body::after {
  position: fixed;
  z-index: 0;
  inset: 0;
  pointer-events: none;
  content: "";
  background:
    radial-gradient(560px 380px at -4% 8%, var(--color-accent-soft), var(--color-transparent) 68%),
    radial-gradient(620px 420px at 104% 92%, var(--color-lavender-soft), var(--color-transparent) 70%),
    radial-gradient(420px 300px at 88% -6%, var(--color-mint-soft), var(--color-transparent) 70%);
}

header,
main,
footer {
  position: relative;
  z-index: 1;
}

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

img {
  height: auto;
}

button,
input,
select,
textarea {
  margin: 0;
  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: 0;
}

ul,
ol {
  padding: 0;
}

ul {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

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

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  padding: 20px;
  color: var(--color-text);
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

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

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

:where(a, button, input, select, textarea, summary, [role="tab"]):focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: var(--page-width);
  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 {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
  overflow-x: clip;
}

.section-tight {
  padding-top: 56px;
  padding-bottom: 56px;
  overflow-x: clip;
}

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

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 10px var(--color-accent-glow);
  content: "";
}

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

h1,
.hero-title {
  font-size: clamp(52px, 5.1vw, 68px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: 0.005em;
}

h2 {
  font-size: clamp(34px, 3.6vw, 48px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(23px, 2.2vw, 30px);
  font-weight: 800;
  line-height: 1.28;
}

h4 {
  font-size: 19px;
  font-weight: 750;
  line-height: 1.35;
}

.lead {
  max-width: 720px;
  color: var(--color-text-muted);
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.7;
}

.lead strong,
.prose strong {
  color: var(--color-text);
}

.gradient-text {
  background: linear-gradient(112deg, var(--color-accent) 8%, var(--color-accent-light) 52%, var(--color-accent) 96%);
  background-clip: text;
  color: var(--color-transparent);
  filter: drop-shadow(0 0 20px var(--color-accent-glow));
  -webkit-background-clip: text;
}

.section-heading {
  display: grid;
  max-width: 820px;
  gap: 16px;
  margin-bottom: 42px;
}

.section-heading p {
  color: var(--color-text-muted);
  font-size: 17px;
}

.btn {
  display: inline-flex;
  min-width: 24px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid var(--color-transparent);
  border-radius: var(--radius-pill);
  padding: 12px 24px;
  font-weight: 750;
  line-height: 1.2;
  text-align: center;
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    box-shadow var(--transition-fast),
    color var(--transition-fast);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

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

.btn-primary {
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-dark));
  box-shadow: var(--shadow-button);
  color: var(--color-bg);
}

.btn-primary:hover {
  box-shadow: 0 14px 40px var(--color-accent-glow);
}

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

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

.btn-muted {
  border-color: var(--color-border);
  background: var(--color-panel-raised);
  color: var(--color-text-muted);
}

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

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

.panel,
.card {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow:
    0 0 0 1px var(--color-accent-soft),
    inset 0 1px 0 var(--color-white-line),
    var(--shadow-panel);
}

.card {
  padding: 28px;
  transition:
    transform var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent-line);
  box-shadow:
    0 0 0 1px var(--color-accent-line),
    0 0 26px var(--color-accent-soft),
    var(--shadow-panel);
}

.badge,
.tag {
  display: inline-flex;
  max-width: 100%;
  min-height: 24px;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  border: 1px solid var(--color-accent-line);
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  padding: 4px 11px;
  color: var(--color-accent-light);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.25;
  text-overflow: ellipsis;
}

.badge-mint {
  border-color: var(--color-mint-line);
  background: var(--color-mint-soft);
  color: var(--color-success);
}

.badge-lavender {
  border-color: var(--color-lavender-line);
  background: var(--color-lavender-soft);
  color: var(--color-lavender);
}

.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  background: var(--color-success);
  box-shadow: 0 0 9px var(--color-mint-glow);
}

.reveal {
  transition:
    opacity 650ms ease,
    transform 650ms ease;
}

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

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

.site-header {
  position: sticky;
  z-index: 80;
  top: 0;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-header);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  gap: 20px;
}

.site-brand {
  display: inline-flex;
  min-width: max-content;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
}

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

.brand-primary {
  font-size: 19px;
  font-weight: 800;
}

.brand-local {
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 600;
}

.desktop-nav {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 2px;
  margin-left: 8px;
}

.desktop-nav a {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  border-radius: var(--radius-pill);
  padding: 7px 13px;
  color: var(--color-text-muted);
  font-size: 14px;
  white-space: nowrap;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

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

.desktop-nav a.is-active {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-weight: 700;
}

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

.login-link {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-dark));
  box-shadow: 0 6px 18px var(--color-accent-glow);
  padding: 8px 20px;
  color: var(--color-bg);
  font-size: 14px;
  font-weight: 800;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.login-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 9px 24px var(--color-accent-glow);
}

.language-picker {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-width: 44px;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: var(--radius-pill);
  background: var(--color-transparent);
  padding: 7px 10px;
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 176px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel-raised);
  box-shadow: var(--shadow-float);
  padding: 7px;
}

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

.language-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  border-radius: var(--radius-sm);
  padding: 8px 11px;
  color: var(--color-text-muted);
}

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

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

.menu-button svg {
  width: 22px;
  height: 22px;
}

.mobile-nav {
  display: none;
}

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

.mobile-nav-panel {
  position: fixed;
  z-index: 82;
  top: var(--header-height);
  right: 0;
  left: 0;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
  padding: 14px var(--gutter) 24px;
  box-shadow: var(--shadow-float);
  -webkit-overflow-scrolling: touch;
}

.mobile-nav-panel ul {
  display: grid;
  gap: 4px;
}

.mobile-nav-panel a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  color: var(--color-text-muted);
}

.mobile-nav-panel a:hover,
.mobile-nav-panel a.is-active {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.mobile-language-label {
  margin: 18px 14px 6px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

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

.mobile-nav-veil[hidden] {
  display: none;
}

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

.footer-main {
  display: grid;
  grid-template-columns: minmax(240px, 1.25fr) repeat(3, minmax(150px, 1fr));
  gap: 46px;
  padding-top: 64px;
  padding-bottom: 50px;
}

.footer-brand {
  display: grid;
  align-content: start;
  gap: 18px;
}

.footer-logo-row {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
}

.footer-logo-row img {
  width: 38px;
  height: 38px;
}

.footer-brand p {
  max-width: 330px;
  color: var(--color-text-muted);
}

.footer-heading {
  margin-bottom: 14px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 800;
}

.footer-links {
  display: grid;
  gap: 7px;
}

.footer-links a {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--color-border);
  padding-top: 22px;
  padding-bottom: 26px;
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.prose {
  color: var(--color-text-muted);
  font-size: 16.5px;
}

.prose > * + * {
  margin-top: 1.2em;
}

.prose h2 {
  margin-top: 2.1em;
  color: var(--color-text);
}

.prose h3 {
  margin-top: 1.7em;
  color: var(--color-text);
}

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

.prose ul,
.prose ol {
  display: grid;
  gap: 8px;
  padding-left: 1.4em;
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li::marker {
  color: var(--color-accent);
}

.prose blockquote {
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-soft);
  padding: 18px 20px;
  color: var(--color-text);
}

[data-counter] {
  display: inline-block;
  min-width: 3.2ch;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.motion-draw {
  overflow: visible;
}

@media (max-width: 1160px) {
  .desktop-nav a {
    padding-inline: 9px;
    font-size: 13px;
  }

  .brand-local {
    display: none;
  }
}

@media (max-width: 980px) {
  .desktop-nav,
  .header-tools .language-picker {
    display: none;
  }

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

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

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

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

  h1,
  .hero-title {
    font-size: clamp(28px, 9.5vw, 40px);
    line-height: 1.15;
    letter-spacing: 0;
  }

  h2 {
    font-size: clamp(29px, 8vw, 38px);
  }

  .button-row .btn {
    flex: 1 1 170px;
  }

  .login-link {
    min-width: 68px;
    padding-inline: 16px;
  }

  .footer-main {
    gap: 36px 24px;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --header-height: 64px;
  }

  body {
    font-size: 14.5px;
  }

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

  .header-inner {
    gap: 8px;
  }

  .site-brand {
    gap: 8px;
  }

  .site-brand img {
    width: 31px;
    height: 31px;
  }

  .brand-primary {
    font-size: 17px;
  }

  .brand-local {
    display: none;
  }

  .header-tools {
    gap: 7px;
    margin-left: auto;
  }

  .login-link {
    min-height: 38px;
    padding: 7px 14px;
  }

  .card {
    padding: 22px;
  }

  .footer-main {
    grid-template-columns: 1fr;
    padding-top: 50px;
  }

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

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

  .section,
  .section-tight,
  .hero,
  [class*="hero-"] {
    overflow-x: clip;
  }

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

@media (max-width: 380px) {
  .login-link {
    min-width: 62px;
    padding-inline: 12px;
    font-size: 13px;
  }

  .site-brand img {
    width: 29px;
    height: 29px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }

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

  .btn:hover,
  .card:hover,
  .login-link:hover {
    transform: none;
  }
}