:root {
  --color-bg: #0A2828;
  --color-panel: #103434;
  --color-panel-raised: #173F3F;
  --color-border: #235555;
  --color-accent: #FF6FA5;
  --color-accent-dark: #E8437F;
  --color-text: #F2F7F5;
  --color-text-muted: #A6C3BE;
  --color-success: #1DD1A1;
  --color-warning: #F0B24A;
  --color-error: #FF5C6C;
  --color-violet: #B98CFF;
  --color-lilac: #E6D3FF;
  --color-white: #FFFFFF;
  --color-overlay: rgba(2, 14, 14, 0.78);
  --color-accent-soft: rgba(255, 111, 165, 0.12);
  --color-success-soft: rgba(29, 209, 161, 0.12);
  --color-violet-soft: rgba(185, 140, 255, 0.12);
  --color-border-soft: rgba(35, 85, 85, 0.7);
  --color-panel-glass: rgba(16, 52, 52, 0.92);

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

  --radius: 8px;
  --radius-small: 6px;
  --radius-round: 999px;
  --header-height: 72px;
  --content-width: 1180px;
  --wide-width: 1280px;
  --reading-width: 780px;
  --gutter: 40px;
  --section-space: 104px;
  --transition-fast: 0.2s ease;
  --transition-slow: 0.55s cubic-bezier(0.2, 0.75, 0.25, 1);
  --shadow-float: 24px 36px 56px -16px rgba(2, 14, 14, 0.7);
  --shadow-soft: 0 12px 32px -12px rgba(2, 14, 14, 0.6);
  --shadow-accent: 0 0 48px rgba(255, 111, 165, 0.12);
  --shadow-success: 0 0 48px rgba(29, 209, 161, 0.12);
  --shadow-violet: 0 0 48px rgba(185, 140, 255, 0.12);
}

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

html {
  min-width: 320px;
  min-height: 100%;
  scroll-behavior: smooth;
  background: var(--color-bg);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  min-height: 100%;
  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,
header,
footer,
nav,
aside,
div {
  min-width: 0;
}

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

svg[data-background-art] {
  width: 100%;
  height: 100%;
}

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

button {
  cursor: pointer;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--color-lilac);
}

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

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

p,
ul,
ol,
pre,
table,
blockquote {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.2;
  text-wrap: balance;
  overflow-wrap: normal;
}

h1 {
  margin-bottom: 1.25rem;
  font-size: clamp(34px, 4.2vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.005em;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(28px, 3.2vw, 40px);
}

h3 {
  margin-bottom: 0.75rem;
  font-size: clamp(21px, 2.2vw, 28px);
}

h4 {
  margin-bottom: 0.6rem;
  font-size: 18px;
}

.title-keep {
  white-space: nowrap;
}

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

strong {
  color: var(--color-text);
  font-weight: 500;
}

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

:not(pre) > code {
  padding: 0.1em 0.35em;
  overflow-wrap: anywhere;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-panel);
  color: var(--color-lilac);
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  scrollbar-color: var(--color-border) var(--color-bg);
  -webkit-overflow-scrolling: touch;
}

pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  white-space: pre;
}

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

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

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

.wrap {
  max-width: calc(var(--content-width) + var(--gutter) * 2);
}

.wide-wrap {
  max-width: calc(var(--wide-width) + var(--gutter) * 2);
}

.reading-wrap {
  max-width: calc(var(--reading-width) + var(--gutter) * 2);
}

.section {
  position: relative;
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
  overflow-x: clip;
}

.section-tight {
  padding-top: 64px;
  padding-bottom: 64px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 44px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 18px;
  height: 1px;
  flex-shrink: 0;
  background: var(--color-accent);
  content: "";
}

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

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

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

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

.panel {
  padding: clamp(22px, 4vw, 40px);
}

.card {
  padding: 24px;
  box-shadow: var(--shadow-soft);
}

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

.tilt {
  transform: rotate(-0.6deg);
}

.button,
.button-primary,
.button-secondary,
.button-small {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 500;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.button,
.button-primary {
  min-height: 48px;
  padding: 0 24px;
  background: var(--color-accent);
  color: var(--color-bg);
  box-shadow: 0 10px 28px -10px rgba(255, 111, 165, 0.55);
}

.button:hover,
.button-primary:hover {
  transform: translateY(-1px);
  background: var(--color-accent-dark);
  color: var(--color-white);
}

.button-secondary {
  padding: 0 18px;
  border-color: var(--color-border);
  background: var(--color-panel);
  color: var(--color-text);
}

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

.button-small {
  min-height: 38px;
  padding: 0 14px;
  background: var(--color-panel-raised);
  color: var(--color-text);
}

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

.button svg,
.button-primary svg,
.button-secondary svg,
.button-small svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.site-topbar {
  position: relative;
  z-index: 50;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border-soft);
  background: var(--color-bg);
  color: var(--color-text);
}

.site-topbar-inner {
  display: flex;
  width: 100%;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  align-items: center;
  gap: 24px;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  color: var(--color-text);
  text-decoration: none;
}

.site-brand:hover {
  color: var(--color-text);
}

.site-brand img {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.site-brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.desktop-nav {
  margin-left: auto;
}

.navline {
  display: flex;
  align-items: center;
}

.navline li {
  display: flex;
  align-items: center;
}

.navline li + li::before {
  margin: 0 14px;
  color: var(--color-border);
  content: "·";
  font-size: 18px;
  line-height: 1;
}

.navline a {
  color: var(--color-text-muted);
  font-size: 15px;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.navline a[aria-current="page"] {
  color: var(--color-accent);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.language-shell {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 40px;
  padding: 0 11px;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-bg);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.language-button:hover,
.language-button[aria-expanded="true"] {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.language-button svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  color: var(--color-success);
}

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 72;
  width: 176px;
  padding: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-panel-raised);
  color: var(--color-text);
  box-shadow: var(--shadow-float);
}

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

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  align-items: center;
  border-radius: var(--radius-small);
  color: var(--color-text);
  text-decoration: none;
}

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

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

.menu-toggle-bars,
.menu-toggle-bars::before,
.menu-toggle-bars::after {
  display: block;
  width: 18px;
  height: 1px;
  background: currentColor;
  transition: transform var(--transition-fast);
}

.menu-toggle-bars {
  position: relative;
}

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

.menu-toggle-bars::before {
  top: -6px;
}

.menu-toggle-bars::after {
  top: 6px;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bars {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bars::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bars::after {
  top: 0;
  transform: rotate(-45deg);
}

.mobile-nav {
  display: none;
  position: absolute;
  top: var(--header-height);
  right: 0;
  left: 0;
  z-index: 70;
  max-height: calc(100dvh - var(--header-height));
  padding: 12px var(--gutter) 22px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel-raised);
  color: var(--color-text);
  box-shadow: var(--shadow-float);
}

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

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  padding: 11px 4px;
  align-items: center;
  border-bottom: 1px solid var(--color-border-soft);
  color: var(--color-text);
  text-decoration: none;
}

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

.mobile-language-label {
  margin: 20px 0 4px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.nav-veil {
  display: none;
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 40;
  border: 0;
  background: var(--color-overlay);
}

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

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

.footer-grid {
  display: grid;
  grid-template-columns: minmax(260px, 1.25fr) repeat(3, minmax(150px, 0.75fr));
  gap: 48px;
  padding-top: 68px;
  padding-bottom: 52px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text);
  text-decoration: none;
}

.footer-brand img {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.footer-intro {
  max-width: 360px;
  margin-top: 18px;
  color: var(--color-text-muted);
}

.footer-title {
  margin-bottom: 16px;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.footer-links {
  display: grid;
  gap: 9px;
}

.footer-links a {
  display: inline-flex;
  width: fit-content;
  color: var(--color-text-muted);
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  padding-top: 22px;
  padding-bottom: 22px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 13px;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.data-table {
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
}

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

.data-table th {
  background: var(--color-panel-raised);
  color: var(--color-text);
  font-weight: 500;
}

.data-table td {
  background: var(--color-panel);
  color: var(--color-text);
}

.prose {
  min-width: 0;
}

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

.prose > h2 {
  margin-top: 3.5rem;
  padding-top: 0.5rem;
}

.prose > h3 {
  margin-top: 2.2rem;
}

.prose > .data-table {
  display: block;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

@media (max-width: 1024px) {
  :root {
    --section-space: 84px;
  }

  .desktop-nav {
    display: none;
  }

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

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

  .footer-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
  }

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7.4vw, 30px);
    line-height: 1.15;
    letter-spacing: 0;
  }

  h2 {
    font-size: clamp(25px, 7vw, 32px);
  }

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

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

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

  body {
    font-size: 15px;
  }

  .wrap,
  .wide-wrap,
  .reading-wrap,
  .site-topbar-inner {
    padding-inline: var(--gutter);
  }

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

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

  .language-button {
    min-width: 44px;
    padding-inline: 9px;
  }

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

  .panel,
  .card {
    padding: 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

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

  pre {
    padding: 16px;
    font-size: 12px;
  }
}

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

  .site-brand-name {
    max-width: 132px;
    white-space: normal;
    line-height: 1.2;
  }

  .header-tools {
    gap: 6px;
  }
}

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

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

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