:root {
  --color-bg: #fffdf8;
  --color-panel: #ffffff;
  --color-panel-soft: #fff3e7;
  --color-border: #e9e5de;
  --color-accent: #ff7417;
  --color-accent-dark: #c94a00;
  --color-text: #181716;
  --color-muted: #6e6a64;
  --color-success: #42c77a;
  --color-warning: #f2cc45;
  --color-error: #e65353;
  --color-info: #64b7f4;
  --color-info-soft: #ddf2ff;
  --color-success-soft: #ddf8e8;
  --color-warning-soft: #fff3b8;
  --color-accent-soft: #ffe5cf;
  --color-shadow: rgba(63, 43, 26, 0.12);
  --color-shadow-soft: rgba(63, 43, 26, 0.07);
  --color-grid: rgba(255, 116, 23, 0.07);
  --color-overlay: rgba(24, 23, 22, 0.38);
  --color-white-muted: rgba(255, 255, 255, 0.76);
  --color-flag-white: #ffffff;
  --color-flag-red: #d94b4b;
  --color-flag-red-deep: #b52f3f;
  --color-flag-blue: #31589b;
  --color-flag-blue-deep: #173b72;
  --color-flag-black: #1b1a19;
  --color-flag-yellow: #f5cf48;
  --color-flag-green: #2f9d63;
  --font-display: "Inter", "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: "Noto Sans SC", "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --radius-pill: 999px;
  --radius-xs: 8px;
  --radius-small: 12px;
  --radius-medium: 18px;
  --radius-large: 28px;
  --radius-window: 30px;
  --shadow-button: 0 12px 25px rgba(201, 74, 0, 0.2);
  --shadow-card: 0 18px 38px rgba(63, 43, 26, 0.1);
  --shadow-window: 0 34px 70px rgba(63, 43, 26, 0.14), 0 10px 28px rgba(63, 43, 26, 0.08);
  --shadow-float: 0 18px 38px rgba(63, 43, 26, 0.13);
  --transition-fast: 180ms ease;
  --transition-slow: 560ms cubic-bezier(0.2, 0.75, 0.25, 1);
  --header-height: 86px;
  --page-width: 1344px;
  --reading-width: 768px;
  --gutter: clamp(16px, 4vw, 48px);
  --h1-size: clamp(52px, 5.2vw, 68px);
  --body-size: 16px;
  --nav-size: 13px;
  --toc-offset: 96px;
}

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

html {
  min-width: 0;
  scroll-behavior: smooth;
  background: var(--color-bg);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 0;
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-body);
  font-size: var(--body-size);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

img {
  height: auto;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  border: 0;
}

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

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

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

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

h1,
.hero-title {
  margin-bottom: 24px;
  font-size: var(--h1-size);
  font-weight: 720;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 720;
  letter-spacing: -0.02em;
  line-height: 1.16;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(21px, 2.4vw, 28px);
  font-weight: 700;
  line-height: 1.3;
}

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

strong {
  font-weight: 720;
}

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

:not(pre) > code {
  padding: 0.12em 0.42em;
  border-radius: var(--radius-xs);
  overflow-wrap: anywhere;
  color: var(--color-accent-dark);
  background: var(--color-panel-soft);
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  margin: 24px 0;
  padding: 20px;
  overflow-x: auto;
  border-radius: var(--radius-medium);
  color: var(--color-panel);
  background: var(--color-text);
  font: 14px/1.7 var(--font-mono);
  -webkit-overflow-scrolling: touch;
}

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

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

.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);
}

.section {
  position: relative;
  overflow-x: clip;
  padding-top: clamp(72px, 9vw, 128px);
  padding-bottom: clamp(72px, 9vw, 128px);
}

.section-soft {
  background: var(--color-panel-soft);
}

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

.section-heading p {
  color: var(--color-muted);
  font-size: 18px;
}

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

.eyebrow,
.badge,
.tag {
  display: inline-flex;
  min-height: 32px;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.3;
}

.eyebrow {
  margin-bottom: 18px;
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
}

.badge {
  color: var(--color-muted);
  background: var(--color-panel);
  box-shadow: 0 7px 20px var(--color-shadow-soft);
}

.badge-accent {
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
}

.badge-success {
  color: var(--color-flag-green);
  background: var(--color-success-soft);
}

.badge-warning {
  color: var(--color-accent-dark);
  background: var(--color-warning-soft);
}

.tag {
  color: var(--color-flag-blue-deep);
  background: var(--color-info-soft);
}

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

.dot-success {
  background: var(--color-success);
}

.dot-warning {
  background: var(--color-warning);
}

.dot-info {
  background: var(--color-info);
}

.button,
.cta {
  min-height: 48px;
  padding: 0 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast), background-color var(--transition-fast);
}

.button:hover,
.cta:hover {
  transform: translateY(-2px);
}

.button:focus-visible,
.cta:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-warning);
  outline-offset: 3px;
}

.button-primary,
.cta-primary {
  color: var(--color-panel);
  background: var(--color-accent);
  box-shadow: var(--shadow-button);
}

.button-dark {
  color: var(--color-panel);
  background: var(--color-text);
}

.button-secondary,
.cta-secondary {
  color: var(--color-text);
  background: var(--color-panel);
  box-shadow: 0 9px 24px var(--color-shadow-soft);
}

.button-quiet {
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
}

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

.button svg,
.cta svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

.panel,
.card {
  border-radius: var(--radius-large);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.panel {
  padding: clamp(24px, 4vw, 48px);
}

.card {
  padding: 28px;
}

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

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

.site-header {
  position: relative;
  z-index: 100;
  min-height: var(--header-height);
}

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

.site-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  min-width: 176px;
}

.site-brand img {
  width: 30px;
  height: 36px;
  object-fit: contain;
}

.site-brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 760;
  letter-spacing: -0.02em;
}

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

.desktop-nav {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  justify-content: center;
  gap: 2px;
  white-space: nowrap;
}

.desktop-nav a {
  padding: 8px 10px;
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  font-size: var(--nav-size);
  font-weight: 520;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

.desktop-nav a.is-active {
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
  font-weight: 680;
}

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

.language-control {
  position: relative;
}

.language-button {
  min-height: 42px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  background: transparent;
  cursor: pointer;
  font-size: 12px;
}

.language-menu {
  position: absolute;
  z-index: 120;
  top: calc(100% + 10px);
  right: 0;
  width: 168px;
  padding: 8px;
  display: none;
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  box-shadow: var(--shadow-float);
}

.language-control.is-open .language-menu {
  display: grid;
}

.language-menu a {
  min-height: 42px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  border-radius: var(--radius-small);
  color: var(--color-muted);
  font-size: 13px;
}

.language-menu a:hover,
.language-menu a.is-current {
  color: var(--color-accent-dark);
  background: var(--color-panel-soft);
}

.login-button {
  min-height: 42px;
  padding: 0 18px;
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  color: var(--color-panel);
  background: var(--color-text);
  font-size: 13px;
  font-weight: 680;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.login-button:hover {
  transform: translateY(-2px);
  opacity: 0.88;
}

.menu-toggle {
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
  display: none;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background: var(--color-panel-soft);
  cursor: pointer;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  width: 20px;
  height: 2px;
  display: block;
  border-radius: var(--radius-pill);
  background: var(--color-text);
  transition: transform var(--transition-fast), opacity var(--transition-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: transparent;
}

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

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

.mobile-nav {
  position: absolute;
  z-index: 130;
  top: var(--header-height);
  right: var(--gutter);
  left: var(--gutter);
  max-height: calc(100dvh - var(--header-height) - 16px);
  padding: 12px;
  display: none;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-radius: var(--radius-large);
  background: var(--color-panel);
  box-shadow: var(--shadow-window);
}

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

.mobile-nav a {
  width: 100%;
  min-height: 46px;
  padding: 11px 14px;
  display: flex;
  align-items: center;
  border-radius: var(--radius-small);
  color: var(--color-muted);
  font-size: 15px;
}

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

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

.nav-veil {
  position: fixed;
  z-index: 90;
  inset: var(--header-height) 0 0;
  display: none;
  background: var(--color-overlay);
}

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

.site-footer {
  position: relative;
  z-index: 81;
  overflow-x: clip;
  padding-top: 72px;
  color: var(--color-white-muted);
  background: var(--color-text);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.2fr) repeat(3, minmax(160px, 1fr));
  gap: 48px;
}

.footer-brand {
  max-width: 330px;
}

.footer-brand-line {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  margin-bottom: 18px;
  color: var(--color-panel);
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 750;
}

.footer-brand-line img {
  width: 32px;
  height: 38px;
}

.footer-brand-line small {
  color: var(--color-white-muted);
  font-size: 13px;
  font-weight: 500;
}

.footer-brand p {
  color: var(--color-white-muted);
  font-size: 14px;
}

.footer-column h2 {
  margin-bottom: 16px;
  color: var(--color-panel);
  font-size: 14px;
  letter-spacing: 0;
}

.footer-links {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  color: var(--color-white-muted);
  font-size: 13px;
}

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

.footer-bottom {
  margin-top: 54px;
  padding: 22px 0 28px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px 24px;
  border-top: 1px solid var(--color-white-muted);
  color: var(--color-white-muted);
  font-size: 12px;
}

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

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

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

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

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

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

.prose h2 {
  margin-top: 64px;
  scroll-margin-top: var(--toc-offset);
}

.prose h3 {
  margin-top: 38px;
  scroll-margin-top: var(--toc-offset);
}

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

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

.prose ol {
  padding-left: 0;
  counter-reset: prose-step;
  list-style: none;
}

.prose ol > li {
  position: relative;
  min-height: 34px;
  padding-left: 46px;
  counter-increment: prose-step;
}

.prose ol > li::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-pill);
  color: var(--color-panel);
  background: var(--color-accent);
  content: counter(prose-step);
  font: 700 12px var(--font-mono);
}

body:has(.toc-tabs) section[id] {
  scroll-margin-top: var(--toc-offset);
}

@media (max-width: 1120px) {
  .desktop-nav {
    display: none;
  }

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

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

  .site-brand {
    min-width: 0;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 72px;
    --toc-offset: 82px;
  }

  h1,
  .hero-title {
    font-size: clamp(28px, 9.5vw, 40px);
    line-height: 1.12;
  }

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

  .section {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .site-header-inner,
  .nav-shell {
    min-height: var(--header-height);
    gap: 10px;
  }

  .site-brand img {
    width: 27px;
    height: 32px;
  }

  .site-brand-name {
    font-size: 18px;
  }

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

  .header-tools {
    margin-left: auto;
    gap: 5px;
  }

  .language-control {
    display: none;
  }

  .login-button {
    min-height: 40px;
    padding-inline: 14px;
  }

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

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

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

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

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

  .button-row,
  .button-row .button,
  .button-row .cta {
    width: 100%;
  }

  .card,
  .panel {
    padding: 22px;
  }

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

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

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

  .mobile-nav {
    right: var(--gutter);
    left: var(--gutter);
  }
}

@media (max-width: 390px) {
  .site-brand-name {
    font-size: 16px;
  }

  .login-button {
    padding-inline: 12px;
    font-size: 12px;
  }
}

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

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

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