:root {
  --color-bg: #0A2921;
  --color-panel: #113429;
  --color-panel-raised: #184334;
  --color-border: #275443;
  --color-accent: #FFD23F;
  --color-accent-dark: #D9A81C;
  --color-text: #EDF6EF;
  --color-text-muted: #9DBBAC;
  --color-success: #4ADE97;
  --color-warning: #F58B3C;
  --color-error: #F26D6D;
  --color-wave: #F2EEDC;
  --color-black: #000000;
  --color-flag-red: #CE3A31;
  --color-flag-white: #F5F4EF;
  --color-flag-blue: #2B4470;
  --color-flag-star: #FFFFFF;
  --color-focus: #FFD23F;
  --font-display: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', 'Menlo', Consolas, 'Courier New', monospace;
  --radius-small: 8px;
  --radius-medium: 12px;
  --radius-large: 18px;
  --radius-pill: 999px;
  --header-height: 76px;
  --content-width: 1264px;
  --reading-width: 820px;
  --gutter: 32px;
  --space-section: 96px;
  --highlight-bg: color-mix(in srgb, var(--color-accent) 26%, transparent);
  --border-soft: color-mix(in srgb, var(--color-border) 60%, transparent);
  --panel-glass: color-mix(in srgb, var(--color-panel) 88%, transparent);
  --panel-soft: color-mix(in srgb, var(--color-panel) 62%, transparent);
  --grid-strong: color-mix(in srgb, var(--color-wave) 10%, transparent);
  --grid-soft: color-mix(in srgb, var(--color-wave) 4.5%, transparent);
  --shadow-ink: color-mix(in srgb, var(--color-black) 55%, var(--color-bg));
  --shadow-card: 0 18px 44px -20px var(--shadow-ink), 0 44px 96px -36px var(--shadow-ink);
  --shadow-button: 0 10px 26px -12px color-mix(in srgb, var(--color-accent) 55%, transparent);
  --focus-ring: 0 0 0 3px color-mix(in srgb, var(--color-focus) 32%, transparent);
  --transition-fast: 180ms ease;
  --transition-slow: 560ms 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;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

h1,
h2,
h3,
h4 {
  color: var(--color-text);
  font-family: var(--font-display);
  line-height: 1.18;
  text-wrap: balance;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(52px, 5.3vw, 72px);
  font-weight: 900;
  letter-spacing: -0.015em;
}

h2 {
  margin-bottom: 22px;
  font-size: clamp(34px, 4vw, 50px);
  font-weight: 900;
  letter-spacing: -0.01em;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(22px, 2.5vw, 30px);
  font-weight: 800;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 800;
}

p {
  margin-bottom: 18px;
}

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

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

svg {
  flex-shrink: 0;
}

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

button {
  cursor: pointer;
}

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

:not(pre) > code {
  overflow-wrap: anywhere;
  color: var(--color-wave);
  background: var(--color-panel-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  padding: 0.12em 0.42em;
}

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

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

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

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

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

.section-soft {
  background: color-mix(in srgb, var(--color-panel) 32%, var(--color-bg));
  border-block: 1px solid var(--border-soft);
}

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

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

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

.eyebrow {
  margin-bottom: 14px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.highlight {
  display: inline-block;
  padding-inline: 0.14em;
  border-radius: 6px;
  background: linear-gradient(180deg, transparent 7%, var(--highlight-bg) 7% 93%, transparent 93%);
}

.btn,
.btn-primary,
.btn-secondary,
.btn-quiet {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 28px;
  border-radius: 10px;
  border: 1px solid transparent;
  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);
}

.btn svg,
.btn-primary svg,
.btn-secondary svg,
.btn-quiet svg {
  width: 16px;
  height: 16px;
}

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

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

.btn-quiet {
  min-height: 40px;
  color: var(--color-text-muted);
  background: transparent;
  border-color: var(--border-soft);
}

.btn-primary:hover,
.btn-secondary:hover,
.btn-quiet:hover {
  transform: translateY(-2px);
}

.btn-secondary:hover,
.btn-quiet:hover {
  color: var(--color-text);
  border-color: color-mix(in srgb, var(--color-accent) 45%, var(--color-border));
}

.btn[aria-disabled='true'],
.btn-primary[aria-disabled='true'],
.btn-secondary[aria-disabled='true'] {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
}

.card,
.panel-card {
  position: relative;
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.card {
  padding: 28px;
}

.panel-card {
  overflow: clip;
}

.card-subtle {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-medium);
  background: var(--color-panel-raised);
  padding: 22px;
}

.reveal {
  transition: opacity 620ms ease, transform 620ms ease;
}

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

.reveal.shown {
  opacity: 1;
  transform: translateY(0);
}

.site-top {
  position: relative;
  z-index: 80;
  border-bottom: 1px solid var(--border-soft);
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
}

.site-top-row {
  position: relative;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: var(--header-height);
}

.site-brand {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
}

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

.site-brand-main {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 900;
  letter-spacing: 0.01em;
}

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

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1 1 auto;
}

.desktop-nav > a,
.nav-more-trigger {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 13px;
  border: 0;
  border-radius: var(--radius-small);
  color: var(--color-text-muted);
  background: transparent;
  font-size: 14.5px;
  font-weight: 550;
}

.desktop-nav > a:hover,
.nav-more-trigger:hover,
.desktop-nav > a.is-active,
.nav-more.is-active > .nav-more-trigger {
  color: var(--color-text);
  background: var(--color-panel);
}

.desktop-nav > a.is-active,
.nav-more.is-active > .nav-more-trigger {
  font-weight: 750;
}

.nav-more {
  position: relative;
}

.nav-more-trigger svg {
  width: 10px;
  height: 10px;
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  width: 176px;
  display: none;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.nav-more:hover .nav-dropdown,
.nav-more:focus-within .nav-dropdown {
  display: block;
}

.nav-dropdown a {
  min-height: 42px;
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-small);
  color: var(--color-text-muted);
  font-size: 14px;
}

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

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

.language-menu {
  position: relative;
}

.language-trigger {
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 10px;
  border: 0;
  border-radius: var(--radius-small);
  color: var(--color-text-muted);
  background: transparent;
}

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

.language-trigger svg {
  width: 12px;
  height: 12px;
}

.language-list {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 5;
  width: 172px;
  display: none;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.language-menu.is-open .language-list {
  display: block;
}

.language-list a {
  min-height: 42px;
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-small);
  color: var(--color-text-muted);
}

.language-list a:hover,
.language-list a[aria-current='true'] {
  color: var(--color-text);
  background: var(--color-panel-raised);
}

.header-login {
  min-width: 72px;
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  color: var(--color-text);
  background: var(--color-panel);
  font-size: 14.5px;
  font-weight: 700;
}

.header-login:hover {
  border-color: color-mix(in srgb, var(--color-accent) 55%, var(--color-border));
  background: var(--color-panel-raised);
}

.menu-toggle {
  min-width: 44px;
  min-height: 44px;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-panel);
}

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

.mobile-nav {
  display: none;
}

.mobile-nav-veil {
  display: none;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-panel) 46%, var(--color-bg));
  overflow-x: clip;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.1fr 0.8fr;
  gap: 48px;
  padding-top: 68px;
  padding-bottom: 48px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  margin-bottom: 18px;
}

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

.footer-brand strong {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
}

.footer-intro {
  max-width: 32em;
  color: var(--color-text-muted);
}

.footer-title {
  margin-bottom: 16px;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

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

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

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 22px;
  padding-bottom: 28px;
  border-top: 1px dashed var(--color-border);
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.footer-legal a {
  min-height: 28px;
  display: inline-flex;
  align-items: center;
}

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

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

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

.prose h3 {
  margin-top: 38px;
}

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

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

.prose li {
  margin-bottom: 9px;
}

.prose img {
  border-radius: var(--radius-medium);
}

@media (max-width: 1040px) {
  .desktop-nav > a,
  .nav-more-trigger {
    padding-inline: 9px;
    font-size: 14px;
  }

  .site-brand-local {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1.3fr 1fr 1fr;
  }

  .footer-grid > :last-child {
    grid-column: 2 / -1;
  }
}

@media (max-width: 860px) {
  :root {
    --header-height: 68px;
  }

  h1 {
    font-size: clamp(28px, 8vw, 40px);
    line-height: 1.12;
    letter-spacing: -0.01em;
  }

  .desktop-nav,
  .header-tools .language-menu {
    display: none;
  }

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

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

  .mobile-nav-veil {
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: 70;
    background: color-mix(in srgb, var(--color-black) 42%, transparent);
  }

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

  .mobile-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    z-index: 90;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 12px var(--gutter) 24px;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-panel);
    box-shadow: var(--shadow-card);
  }

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

  .mobile-nav-group {
    display: grid;
  }

  .mobile-nav-label {
    padding: 16px 12px 8px;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.12em;
  }

  .mobile-nav a {
    width: 100%;
    min-height: 48px;
    display: flex;
    align-items: center;
    padding: 11px 12px;
    border-radius: var(--radius-small);
    color: var(--color-text-muted);
  }

  .mobile-nav a:hover,
  .mobile-nav a.is-active,
  .mobile-nav a[aria-current='true'] {
    color: var(--color-text);
    background: var(--color-panel-raised);
  }

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

  .footer-grid > :first-child {
    grid-column: 1 / -1;
  }

  .footer-grid > :last-child {
    grid-column: auto;
  }
}

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

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

  body {
    font-size: 15.5px;
  }

  h2 {
    font-size: clamp(28px, 9vw, 38px);
  }

  h3 {
    font-size: 22px;
  }

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

  .site-top-row {
    gap: 9px;
  }

  .site-brand {
    gap: 8px;
  }

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

  .site-brand-main {
    font-size: 19px;
  }

  .header-tools {
    gap: 7px;
  }

  .header-login {
    min-width: 62px;
    padding-inline: 13px;
  }

  .mobile-nav {
    padding-inline: var(--gutter);
  }

  .btn,
  .btn-primary,
  .btn-secondary {
    max-width: 100%;
    padding-inline: 22px;
  }

  .card {
    padding: 22px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 34px;
    padding-top: 52px;
  }

  .footer-grid > :first-child,
  .footer-grid > :last-child {
    grid-column: auto;
  }

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

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

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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