:root {
  --color-bg: #191919;
  --color-panel: #202020;
  --color-panel-raised: #282828;
  --color-border: #3A3A3A;
  --color-grid: #212121;
  --color-accent: #D7F534;
  --color-accent-deep: #9FB912;
  --color-text: #F5F5F3;
  --color-text-muted: #9E9E9C;
  --color-success: #6FDE8B;
  --color-warning: #F5B94A;
  --color-error: #F26D5B;
  --color-white: #FFFFFF;
  --color-paper: #FFFFFF;
  --color-paper-soft: #F7F7F5;
  --color-paper-panel: #FBFBFA;
  --color-paper-border: #E4E4E4;
  --color-ink: #191919;
  --color-ink-muted: #626260;
  --color-focus: #D7F534;
  --color-scan: rgba(215, 245, 52, 0.12);
  --color-chip: rgba(215, 245, 52, 0.08);
  --color-shadow: rgba(0, 0, 0, 0.38);
  --color-shadow-soft: rgba(0, 0, 0, 0.18);
  --color-glow-pink: rgba(255, 106, 142, 0.30);
  --color-glow-orange: rgba(255, 154, 92, 0.22);
  --color-glow-violet: rgba(123, 108, 246, 0.26);
  --color-flag-red: #D7373F;
  --color-flag-navy: #2B3A8C;
  --color-flag-blue: #2E5AAC;
  --color-flag-green: #17884B;
  --color-transparent: transparent;
  --shadow-card: 0 24px 48px var(--color-shadow);
  --shadow-soft: 0 12px 28px var(--color-shadow-soft);
  --radius-large: 24px;
  --radius-medium: 16px;
  --radius-small: 10px;
  --radius-pill: 999px;
  --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, 'SF Mono', Menlo, Consolas, monospace;
  --page-width: 1240px;
  --reading-width: 860px;
  --header-width: 1280px;
  --header-height: 64px;
  --gutter: 32px;
  --section-space: 104px;
  --ease-fast: 150ms ease;
  --ease-reveal: 560ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  background: var(--color-bg);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 0;
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

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,
a {
  -webkit-tap-highlight-color: var(--color-transparent);
}

button {
  border: 0;
}

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

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

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

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

:not(pre) > code {
  overflow-wrap: anywhere;
  border: 1px solid var(--color-paper-border);
  border-radius: var(--radius-small);
  background: var(--color-paper-soft);
  color: var(--color-ink);
  padding: 0.12em 0.38em;
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  color: var(--color-text);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

pre code {
  color: inherit;
}

hr {
  border: 0;
  border-top: 1px solid var(--color-paper-border);
}

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

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

.wrap {
  width: 100%;
  max-width: calc(var(--page-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);
}

.header-wrap {
  width: 100%;
  max-width: min(100%, calc(var(--header-width) + var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.paper-section {
  overflow-x: clip;
  background: var(--color-paper);
  color: var(--color-ink);
}

.paper-section p,
.paper-section li {
  color: var(--color-ink-muted);
}

.dark-section {
  overflow-x: clip;
  background: var(--color-bg);
  color: var(--color-text);
}

h1,
h2,
h3,
h4 {
  color: inherit;
  font-family: var(--font-display);
  font-weight: 800;
  text-wrap: balance;
}

h1,
.hero-title {
  margin-bottom: 20px;
  font-size: clamp(34px, 3.3vw, 48px);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(30px, 3vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(21px, 2vw, 28px);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

h4 {
  margin-bottom: 8px;
  font-size: 18px;
  line-height: 1.4;
}

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

.kicker {
  margin-bottom: 16px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.paper-section .kicker {
  color: var(--color-ink);
}

.lead {
  max-width: 680px;
  color: var(--color-text-muted);
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.65;
}

.paper-section .lead {
  color: var(--color-ink-muted);
}

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

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

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

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

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

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 11px 24px;
  background: var(--color-panel);
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: transform var(--ease-fast), background-color var(--ease-fast), border-color var(--ease-fast);
}

.button svg {
  width: 16px;
  height: 16px;
}

.button:hover {
  transform: translateY(-2px);
  border-color: var(--color-text-muted);
}

.button-primary {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-ink);
}

.button-primary:hover {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

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

.paper-section .button-secondary,
.button-paper {
  border-color: var(--color-ink);
  background: var(--color-white);
  color: var(--color-ink);
}

.button[disabled],
.button.is-disabled {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
}

.chip-row {
  display: flex;
  max-width: 100%;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.chip {
  display: inline-flex;
  max-width: 100%;
  min-height: 30px;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text-muted);
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
}

.chip:hover {
  border-color: var(--color-accent-deep);
  color: var(--color-accent);
}

.paper-section .chip {
  border-color: var(--color-paper-border);
  background: var(--color-paper-soft);
  color: var(--color-ink);
}

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

.paper-panel {
  border: 1px solid var(--color-paper-border);
  border-radius: var(--radius-large);
  background: var(--color-paper-panel);
  color: var(--color-ink);
}

.panel-pad {
  padding: 28px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-paper-border);
  border-radius: var(--radius-medium);
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: var(--color-white);
  color: var(--color-ink);
}

.data-table th,
.data-table td {
  border-bottom: 1px solid var(--color-paper-border);
  padding: 15px 18px;
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: var(--color-paper-soft);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.data-table td {
  color: var(--color-ink-muted);
}

.data-table tr:last-child td {
  border-bottom: 0;
}

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

.prose h2,
.prose h3,
.prose h4,
.prose strong {
  color: var(--color-ink);
}

.prose a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-deep);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.prose p,
.prose li {
  overflow-wrap: break-word;
}

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

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--ease-reveal), transform var(--ease-reveal);
}

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

.site-head {
  position: relative;
  z-index: 60;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
}

.site-head-inner {
  display: flex;
  height: var(--header-height);
  align-items: center;
  gap: 22px;
}

.site-brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
}

.site-brand img {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.site-brand-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

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

.desktop-nav a {
  display: flex;
  min-height: 38px;
  align-items: center;
  border-radius: var(--radius-pill);
  padding: 7px 15px;
  color: var(--color-text-muted);
  font-size: 14px;
  transition: color var(--ease-fast), background-color var(--ease-fast);
}

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

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

.header-tools {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 8px;
}

.language-box {
  position: relative;
}

.language-trigger {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text-muted);
  padding: 6px 14px;
  font-size: 13px;
  white-space: nowrap;
  cursor: pointer;
}

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

.language-trigger-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 74;
  width: 172px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
}

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

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

.language-menu a:hover,
.language-menu a.is-current {
  background: var(--color-panel-raised);
  color: var(--color-text);
}

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

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  display: block;
  width: 18px;
  height: 1px;
  background: var(--color-text);
  transition: transform var(--ease-fast), opacity var(--ease-fast);
}

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

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

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

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

.menu-toggle[aria-expanded="true"] .menu-toggle-lines {
  background: var(--color-transparent);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::before {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::after {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  display: none;
}

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

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

.mobile-nav a:hover,
.mobile-nav a.is-active,
.mobile-nav a.is-current {
  background: var(--color-panel-raised);
  color: var(--color-text);
}

.mobile-nav a.is-active {
  box-shadow: inset 4px 0 0 var(--color-accent);
}

.mobile-nav-languages {
  border-top: 1px solid var(--color-border);
  margin-top: 8px;
  padding-top: 8px;
}

.mobile-nav-label {
  padding: 8px 14px 4px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.nav-veil {
  display: none;
}

.site-footer {
  overflow-x: clip;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr 0.9fr;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 54px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  margin-bottom: 16px;
  color: var(--color-text);
  font-weight: 800;
}

.footer-brand img {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

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

.footer-title {
  margin-bottom: 14px;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.13em;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-links a {
  width: fit-content;
  max-width: 100%;
  color: var(--color-text-muted);
  font-size: 14px;
}

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

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid var(--color-border);
  padding-top: 22px;
  padding-bottom: 26px;
  color: var(--color-text-muted);
  font-size: 13px;
}

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

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

@media (max-width: 1080px) {
  .desktop-nav a {
    padding-inline: 10px;
  }

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

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

@media (max-width: 860px) {
  :root {
    --gutter: 24px;
    --section-space: 80px;
  }

  h1,
  .hero-title {
    font-size: clamp(28px, 5vw, 30px);
  }

  .desktop-nav {
    display: none;
  }

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

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

  .mobile-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    z-index: 72;
    display: block;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
    padding: 12px var(--gutter) 24px;
  }

  .nav-veil {
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: 50;
    display: block;
    background: var(--color-shadow-soft);
  }

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

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

  body {
    font-size: 15px;
  }

  h1,
  .hero-title {
    font-size: clamp(24px, 7.6vw, 30px);
    line-height: 1.18;
  }

  h2 {
    font-size: clamp(26px, 8vw, 34px);
  }

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

  .site-brand-name {
    font-size: 14px;
  }

  .language-trigger-full {
    display: none;
  }

  .language-trigger-short {
    display: inline;
  }

  .language-trigger {
    min-width: 48px;
    padding-inline: 10px;
  }

  .button-row {
    align-items: stretch;
  }

  .button-row .button {
    flex: 1 1 150px;
  }

  .chip-row {
    flex-direction: row;
    align-items: center;
  }

  .panel-pad {
    padding: 20px;
  }

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

  .footer-main {
    gap: 32px;
  }

  .footer-legal {
    flex-direction: column;
  }

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

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

@media (max-width: 360px) {
  .site-brand-name {
    max-width: 112px;
    white-space: normal;
    line-height: 1.1;
  }

  .header-tools {
    gap: 5px;
  }

  .button-row .button {
    flex-basis: 100%;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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

  .button:hover {
    transform: none;
  }
}