:root {
  --color-bg: #EDF2FA;
  --color-panel: #F8FBFF;
  --color-panel-strong: #E1E9F6;
  --color-border: #C7D4E8;
  --color-accent: #F06A17;
  --color-accent-dark: #C24F0A;
  --color-text: #131A26;
  --color-text-muted: #57647B;
  --color-success: #1F9D66;
  --color-warning: #DFA100;
  --color-error: #D6403A;
  --color-white: #FFFFFF;
  --color-transparent: transparent;
  --color-accent-soft: rgba(240, 106, 23, .14);
  --color-accent-faint: rgba(240, 106, 23, .06);
  --color-accent-glow: rgba(240, 106, 23, .38);
  --color-ink-05: rgba(19, 26, 38, .05);
  --color-ink-08: rgba(19, 26, 38, .08);
  --color-ink-12: rgba(19, 26, 38, .12);
  --color-line-faint: rgba(199, 212, 232, .32);
  --color-white-wash: rgba(255, 255, 255, .72);
  --color-overlay: rgba(19, 26, 38, .38);
  --color-flag-red: #C93A3E;
  --color-flag-navy: #2B4470;
  --color-flag-white: #FFFFFF;
  --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', monospace;
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --shadow-card: 0 12px 26px var(--color-ink-08), 0 34px 70px var(--color-ink-12);
  --shadow-soft: 0 10px 30px var(--color-ink-05);
  --shadow-button: 0 8px 20px var(--color-accent-glow);
  --header-height: 64px;
  --content-width: 1240px;
  --reading-width: 820px;
  --gutter: 32px;
  --section-space: 96px;
  --focus-ring: 2px solid var(--color-accent);
  --transition-fast: 150ms ease;
  --transition-slow: 600ms cubic-bezier(.2, .7, .2, 1);
  --toc-offset: 84px;
}

*,
*::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);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

img {
  height: auto;
}

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

button {
  border: 0;
  cursor: pointer;
}

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

p,
ul,
ol,
dl,
blockquote,
figure,
pre {
  margin-top: 0;
}

p:last-child,
ul:last-child,
ol:last-child,
blockquote:last-child {
  margin-bottom: 0;
}

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

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

:not(pre) > code {
  padding: .12em .34em;
  overflow-wrap: anywhere;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  background: var(--color-panel-strong);
  font-size: .9em;
}

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

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

table {
  border-collapse: collapse;
}

th,
td {
  text-align: left;
}

hr {
  height: 1px;
  margin: 40px 0;
  border: 0;
  background: var(--color-border);
}

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

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

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

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

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

.card {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: 0 10px 24px var(--color-ink-05);
}

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

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  margin-bottom: 14px;
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
}

.eyebrow::before {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  text-wrap: balance;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(52px, 5.2vw, 72px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.1;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.16;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 750;
  line-height: 1.25;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  line-height: 1.35;
}

.lead {
  max-width: 760px;
  color: var(--color-text-muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.65;
}

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

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

.title-accent {
  background: linear-gradient(var(--color-transparent) 74%, var(--color-accent-soft) 0);
}

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

.btn {
  display: inline-flex;
  min-width: 24px;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 24px;
  border: 1px solid var(--color-transparent);
  border-radius: var(--radius-md);
  font-weight: 700;
  line-height: 1.25;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

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

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

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

.btn-secondary:hover {
  border-color: var(--color-text-muted);
  background: var(--color-white);
}

.btn-ghost {
  border-color: var(--color-accent);
  background: var(--color-transparent);
  color: var(--color-accent-dark);
}

.btn-ghost:hover {
  background: var(--color-accent-soft);
}

.btn-small {
  min-height: 38px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}

.btn[aria-disabled="true"],
.btn:disabled {
  border-color: var(--color-border);
  background: var(--color-panel-strong);
  color: var(--color-text-muted);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
}

.header-inner {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  gap: 28px;
}

.site-brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
}

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

.brand-word {
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.02em;
}

.brand-local {
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 500;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.desktop-nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding-inline: 2px;
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 550;
}

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

.desktop-nav a.is-active {
  font-weight: 750;
}

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

.header-login {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  padding: 7px 17px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-accent-dark);
  font-size: 14px;
  font-weight: 700;
}

.header-login:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

.language-switcher {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 9px;
  border-radius: var(--radius-sm);
  background: var(--color-transparent);
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 168px;
  padding: 7px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
}

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

.language-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  padding: 8px 11px;
  border-radius: var(--radius-xs);
  color: var(--color-text-muted);
  font-size: 14px;
}

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

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-transparent);
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  display: block;
  width: 21px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-text);
}

.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;
}

.mobile-nav {
  display: none;
}

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

.mobile-nav-panel {
  position: absolute;
  z-index: 103;
  top: var(--header-height);
  right: 0;
  left: 0;
  max-height: calc(100dvh - var(--header-height));
  padding: 12px var(--gutter) 24px;
  overflow-y: auto;
  border-top: 1px solid var(--color-border);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
  overscroll-behavior: contain;
}

.mobile-nav-panel a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-weight: 650;
}

.mobile-nav-panel a.is-active {
  color: var(--color-accent-dark);
}

.mobile-nav-languages {
  padding-top: 12px;
}

.mobile-nav-languages strong {
  display: block;
  padding: 8px 12px;
  color: var(--color-text);
  font-size: 13px;
}

.mobile-nav-languages a {
  font-size: 14px;
}

.menu-veil {
  position: fixed;
  z-index: 99;
  inset: var(--header-height) 0 0;
  border: 0;
  background: var(--color-overlay);
}

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

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

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr .85fr;
  gap: 42px;
  padding-top: 62px;
  padding-bottom: 46px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-brand img {
  width: 30px;
  height: 30px;
}

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

.footer-column h2 {
  margin-bottom: 13px;
  font-size: 15px;
  letter-spacing: 0;
}

.footer-links {
  display: grid;
  gap: 5px;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 14px;
}

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

.footer-legal {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 16px;
  padding-bottom: 16px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.reveal {
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

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

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

.prose h2 {
  margin-top: 72px;
}

.prose h3 {
  margin-top: 42px;
}

.prose p,
.prose li {
  color: var(--color-text-muted);
}

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

.prose a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose img {
  margin: 32px auto;
  border-radius: var(--radius-md);
}

.prose ol.steps {
  padding: 0;
  counter-reset: procedure;
  list-style: none;
}

.prose ol.steps > li {
  position: relative;
  min-height: 44px;
  padding-left: 54px;
  counter-increment: procedure;
}

.prose ol.steps > li + li {
  margin-top: 24px;
}

.prose ol.steps > li::before {
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-white);
  content: counter(procedure);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

@media (max-width: 1160px) {
  .desktop-nav {
    gap: 13px;
  }

  .desktop-nav a {
    font-size: 13px;
  }

  .brand-local {
    display: none;
  }
}

@media (max-width: 980px) {
  :root {
    --section-space: 76px;
  }

  .desktop-nav,
  .language-switcher {
    display: none;
  }

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

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

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

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

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
    --section-space: 64px;
  }

  h1 {
    font-size: clamp(32px, 9.5vw, 40px);
    line-height: 1.12;
  }

  h2 {
    font-size: clamp(28px, 8vw, 38px);
  }

  .lead {
    font-size: 18px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 34px 24px;
  }

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

  .footer-legal {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }
}

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

  html,
  body {
    overflow-x: clip;
  }

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

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

  .brand-local {
    display: none;
  }

  .header-inner {
    gap: 8px;
  }

  .header-login {
    min-height: 38px;
    padding-inline: 12px;
  }

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

  .card {
    padding: 22px;
  }

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

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

@media (max-width: 380px) {
  .brand-word {
    font-size: 17px;
  }

  .header-login {
    padding-inline: 9px;
    font-size: 13px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }

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