:root {
  --color-bg: #ECE8F8;
  --color-panel: #F7F5FD;
  --color-panel-deep: #DFD9F2;
  --color-border: #CBC3E6;
  --color-accent: #FF3E6C;
  --color-accent-dark: #D3234F;
  --color-text: #1A1433;
  --color-muted: #5F5880;
  --color-success: #1E9E6E;
  --color-warn: #D9921C;
  --color-error: #D12E3F;
  --color-ink: #1B1540;
  --color-ink-raised: #26205A;
  --color-white: #FFFFFF;
  --color-lavender-light: #F7F5FD;
  --color-lavender: #CBC3E6;
  --color-lavender-mid: #8F86B8;
  --color-lavender-dark: #5F5880;
  --color-dot: rgba(27, 21, 64, .075);
  --color-ink-border: rgba(247, 245, 253, .13);
  --color-ink-rule: rgba(203, 195, 230, .14);
  --color-ink-chip: rgba(247, 245, 253, .03);
  --color-ink-chip-border: rgba(203, 195, 230, .32);
  --color-header-glass: rgba(247, 245, 253, .72);
  --color-panel-glow: rgba(255, 255, 255, .95);
  --color-panel-glow-mid: rgba(255, 255, 255, .55);
  --color-panel-glow-clear: rgba(247, 245, 253, 0);
  --color-shadow-soft: rgba(26, 20, 51, .12);
  --color-shadow-mid: rgba(27, 21, 64, .38);
  --color-shadow-deep: rgba(27, 21, 64, .5);
  --color-accent-shadow: rgba(255, 62, 108, .55);
  --color-flag-red: #D8232A;
  --color-flag-blue: #1D4F9E;
  --color-flag-green: #1E8F4E;
  --color-flag-gold: #F2C94C;
  --gradient-heading: linear-gradient(94deg, #1B1540 0%, #3E3580 52%, #7C73AA 100%);
  --gradient-brand: linear-gradient(135deg, #1B1540 0%, #5A4F9E 100%);
  --shadow-panel: 0 1px 1px rgba(26, 20, 51, .22), 0 14px 30px -10px rgba(27, 21, 64, .38), 0 46px 90px -34px rgba(27, 21, 64, .5);
  --shadow-button: 0 6px 18px -6px rgba(255, 62, 108, .55);
  --shadow-card: 0 16px 38px -30px rgba(27, 21, 64, .5);
  --font-display: 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-pill: 999px;
  --header-height: 64px;
  --hero-peek: 44px;
  --content-width: 1280px;
  --reading-width: 820px;
  --gutter: 32px;
  --section-space: 84px;
  --focus-size: 2px;
  --toc-offset: 122px;
}

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

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

html.nav-open {
  overflow: hidden;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-wrap: break-word;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: radial-gradient(circle, var(--color-dot) 1px, transparent 1.3px);
  background-size: 22px 22px;
  font-family: var(--font-body);
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
}

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

section,
.hero,
.site-footer {
  position: relative;
  overflow-x: clip;
}

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

img {
  height: auto;
}

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

button {
  cursor: pointer;
}

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

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

ul,
ol {
  padding-left: 1.25rem;
}

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

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

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 18px;
  border: 1px solid var(--color-ink-rule);
  border-radius: var(--radius-md);
  color: var(--color-lavender-light);
  background: var(--color-ink);
  -webkit-overflow-scrolling: touch;
}

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

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

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

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

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

.section {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  max-width: 100%;
  margin: 0;
  padding: 5px 11px 5px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  background: var(--color-panel);
  font-size: 12.5px;
  font-weight: 600;
}

.eyebrow svg {
  width: 14px;
  height: 14px;
  flex: none;
}

.eyebrow .sep {
  width: 1px;
  height: 12px;
  flex: none;
  background: var(--color-border);
}

.badge,
.chip {
  display: inline-flex;
  min-height: 28px;
  max-width: 100%;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text);
  background: var(--color-panel);
  font-size: 12px;
  font-weight: 700;
  text-overflow: ellipsis;
}

.badge-dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--color-success);
}

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

h1 {
  font-size: clamp(52px, 5.2vw, 68px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.018em;
}

h2 {
  font-size: clamp(32px, 3.8vw, 48px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -.015em;
}

h3 {
  font-size: clamp(21px, 2.1vw, 28px);
  font-weight: 800;
  line-height: 1.25;
}

.lede {
  color: var(--color-muted);
  font-size: 16.5px;
  line-height: 1.65;
}

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

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

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

.btn {
  display: inline-flex;
  min-width: 24px;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 750;
  line-height: 1;
  white-space: nowrap;
  transition: transform .15s ease, border-color .15s ease, background-color .15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn-primary {
  color: var(--color-white);
  background: var(--color-accent);
  box-shadow: var(--shadow-button);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
}

.btn-secondary,
.btn-ghost {
  border-color: var(--color-border);
  color: var(--color-text);
  background: var(--color-panel);
}

.btn-secondary:hover,
.btn-ghost:hover {
  border-color: var(--color-lavender-mid);
  background: var(--color-white);
}

.btn-dark {
  border-color: var(--color-ink);
  color: var(--color-lavender-light);
  background: var(--color-ink);
}

.btn-dark:hover {
  background: var(--color-ink-raised);
}

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

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

.card {
  padding: 24px;
}

.window-panel {
  overflow: hidden;
  border: 1px solid var(--color-ink-border);
  border-radius: var(--radius-lg);
  color: var(--color-lavender);
  background: var(--color-ink);
  box-shadow: var(--shadow-panel);
}

.window-chrome {
  display: flex;
  height: 38px;
  align-items: center;
  gap: 12px;
  padding-inline: 14px;
  border-bottom: 1px solid var(--color-ink-rule);
  background: var(--color-ink-chip);
}

.window-dots {
  display: flex;
  gap: 6px;
}

.window-dots i {
  width: 10px;
  height: 10px;
  flex: none;
  border-radius: 50%;
  background: var(--color-lavender);
}

.window-dots i:nth-child(2) {
  background: var(--color-lavender-mid);
}

.window-dots i:nth-child(3) {
  background: var(--color-lavender-dark);
}

.window-title {
  margin-left: auto;
  color: var(--color-lavender-mid);
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: nowrap;
}

.reveal {
  transition: opacity .55s ease, transform .55s ease;
}

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

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

.site-header {
  position: relative;
  z-index: 50;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-header-glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  height: 100%;
  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;
  flex: none;
}

.brand-word {
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -.02em;
}

.brand-local {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 600;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
}

.nav-link {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 650;
  white-space: nowrap;
  transition: color .15s ease, background-color .15s ease;
}

.nav-link svg {
  width: 15px;
  height: 15px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

.header-tools {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-left: auto;
}

.language-picker {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 10px;
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  background: transparent;
  font-size: 13px;
  font-weight: 650;
}

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

.language-menu {
  position: absolute;
  top: calc(100% + 9px);
  right: 0;
  z-index: 70;
  width: 160px;
  padding: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
}

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

.language-menu a {
  display: flex;
  min-height: 38px;
  align-items: center;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-size: 13px;
}

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

.login-link {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 8px 16px;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-md);
  color: var(--color-lavender-light);
  background: var(--color-ink);
  font-size: 14px;
  font-weight: 750;
  line-height: 1;
  white-space: nowrap;
}

.login-link:hover {
  background: var(--color-ink-raised);
}

.login-link svg {
  width: 14px;
  height: 14px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.menu-toggle {
  display: none;
  width: 44px;
  min-width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  background: var(--color-panel);
}

.menu-toggle svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
}

.mobile-nav {
  display: none;
}

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

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 46px;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-weight: 700;
}

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

.mobile-nav svg {
  width: 17px;
  height: 17px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

.mobile-language-list a {
  font-size: 13px;
}

.nav-veil {
  display: none;
}

.site-footer {
  padding-top: 56px;
  padding-bottom: 22px;
  border-top: 1px solid var(--color-border);
  background: var(--color-panel);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1.2fr .8fr;
  gap: 36px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-brand img {
  width: 34px;
  height: 34px;
  flex: none;
}

.footer-copy {
  max-width: 340px;
  color: var(--color-muted);
  font-size: 14px;
}

.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: 28px;
  align-items: center;
  color: var(--color-muted);
  font-size: 13px;
}

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

.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.footer-keywords a {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  padding: 4px 9px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  background: var(--color-bg);
  font-size: 12px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 38px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

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

@media (max-width: 1160px) {
  .header-inner {
    gap: 16px;
  }

  .desktop-nav {
    gap: 1px;
    margin-left: 0;
  }

  .nav-link {
    padding-inline: 7px;
    font-size: 13px;
  }

  .language-button {
    display: none;
  }
}

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

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

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

  .mobile-nav {
    position: absolute;
    top: var(--header-height);
    right: 0;
    left: 0;
    z-index: 60;
    display: grid;
    max-height: calc(100dvh - var(--header-height));
    gap: 2px;
    padding: 12px var(--gutter) 18px;
    overflow-y: auto;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-panel);
    box-shadow: var(--shadow-panel);
    overscroll-behavior: contain;
  }

  .nav-veil {
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: 40;
    display: block;
    border: 0;
    background: var(--color-shadow-soft);
  }

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

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

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
    --section-space: 62px;
  }

  h1 {
    font-size: clamp(34px, 10vw, 40px);
    letter-spacing: -.01em;
  }

  h2 {
    font-size: clamp(28px, 8vw, 36px);
  }

  .lede {
    font-size: 15px;
  }

  .brand-local {
    display: none;
  }
}

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

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

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

  .login-link {
    min-height: 42px;
    padding-inline: 13px;
  }

  .header-inner {
    gap: 8px;
  }

  .site-brand {
    gap: 7px;
  }

  .site-brand img {
    width: 28px;
    height: 28px;
  }

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

  .button-row .btn {
    flex: 1 1 145px;
  }

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

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

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

  .reveal,
  .reveal.pending,
  .btn,
  .nav-link {
    opacity: 1;
    transform: none;
    transition: none;
  }
}