:root {
  --color-canvas: #FFFFFF;
  --color-panel: #F7F5F2;
  --color-panel-warm: #FBEFE4;
  --color-line: #ECE8E2;
  --color-brand: #F07E22;
  --color-brand-strong: #D2620E;
  --color-ink: #26221C;
  --color-ink-soft: #6E675E;
  --color-success: #3BA55D;
  --color-warning: #E3A93C;
  --color-danger: #DE4B3F;
  --color-switch-off: #E5DFD7;
  --color-white-text: #FFFFFF;
  --color-overlay: rgba(38, 34, 28, .32);
  --color-shadow-soft: rgba(38, 34, 28, .06);
  --color-shadow-faint: rgba(38, 34, 28, .04);
  --color-shadow-brand: rgba(210, 98, 14, .16);
  --color-shadow-brand-strong: rgba(210, 98, 14, .24);
  --color-glow-core: rgba(240, 126, 34, .18);
  --color-glow-mid: rgba(251, 239, 228, .62);
  --color-glow-clear: rgba(255, 255, 255, 0);

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

  --radius-small: 10px;
  --radius-card: 14px;
  --radius-panel: 22px;
  --radius-section: 24px;
  --radius-pill: 999px;

  --shadow-soft: 0 1px 2px var(--color-shadow-faint), 0 10px 30px var(--color-shadow-soft);
  --shadow-deep: 0 2px 6px var(--color-shadow-soft), 0 24px 60px var(--color-shadow-brand), 0 60px 120px var(--color-shadow-soft);
  --shadow-button: 0 2px 6px var(--color-shadow-brand-strong), 0 12px 28px var(--color-shadow-brand);
  --shadow-knob: 0 1px 2px var(--color-overlay);

  --content-width: 1120px;
  --wide-width: 1280px;
  --reading-width: 760px;
  --gutter: 40px;
  --header-height: 76px;
  --section-space: 104px;
  --transition-fast: 150ms ease;
  --transition-reveal: 600ms cubic-bezier(.2, .7, .2, 1);
}

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

html {
  background: var(--color-canvas);
  color: var(--color-ink);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

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: transparent;
}

button {
  border: 0;
}

a {
  color: var(--color-brand-strong);
  text-decoration-thickness: .08em;
  text-underline-offset: .18em;
}

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

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

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

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  line-height: 1.18;
  text-wrap: balance;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(34px, 3.3vw, 48px);
  font-weight: 800;
  letter-spacing: -.02em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 800;
  letter-spacing: -.018em;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(21px, 2.2vw, 28px);
  font-weight: 750;
  letter-spacing: -.012em;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 700;
}

.nowrap-term {
  white-space: nowrap;
}

strong {
  font-weight: 700;
}

small {
  font-size: .875em;
}

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

:not(pre) > code {
  overflow-wrap: anywhere;
  padding: .12em .38em;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--color-panel);
  color: var(--color-ink);
  font-size: .9em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-ink);
  color: var(--color-canvas);
  font: 14px/1.7 var(--font-mono);
  overscroll-behavior-inline: contain;
  -webkit-overflow-scrolling: touch;
}

pre code {
  color: inherit;
  white-space: pre;
}

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

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

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  margin-bottom: 16px;
  padding: 5px 13px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  color: var(--color-ink-soft);
  font-size: 12.5px;
  font-weight: 650;
}

.eyebrow::before {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-brand);
  content: "";
}

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

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

.card,
.panel {
  border: 1px solid var(--color-line);
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-soft);
}

.card {
  padding: 24px;
  border-radius: var(--radius-card);
}

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

.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;
  padding: 12px 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.button svg {
  width: 17px;
  height: 17px;
}

.button-primary {
  border-color: var(--color-brand-strong);
  background: var(--color-brand-strong);
  color: var(--color-white-text);
  box-shadow: var(--shadow-button);
}

.button-primary:hover {
  border-color: var(--color-ink);
  background: var(--color-ink);
  color: var(--color-white-text);
  transform: translateY(-1px);
}

.button-secondary {
  border-color: var(--color-line);
  background: var(--color-canvas);
  color: var(--color-ink);
}

.button-secondary:hover {
  border-color: var(--color-brand-strong);
  background: var(--color-panel-warm);
  color: var(--color-ink);
}

.button-quiet {
  min-height: 42px;
  padding: 9px 18px;
  border-color: var(--color-line);
  background: var(--color-panel);
  color: var(--color-ink);
}

.button[disabled],
.button.is-disabled {
  border-color: var(--color-line);
  background: var(--color-panel);
  color: var(--color-ink-soft);
  box-shadow: none;
  cursor: not-allowed;
  opacity: .72;
  transform: none;
}

.site-header {
  position: relative;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-canvas);
  color: var(--color-ink);
}

.header-shell {
  display: flex;
  width: 100%;
  max-width: min(100%, calc(var(--wide-width) + var(--gutter) * 2));
  height: var(--header-height);
  align-items: center;
  gap: 28px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
  text-decoration: none;
}

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

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

.site-brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-left: auto;
}

.desktop-nav a {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  padding: 7px 15px;
  border-radius: var(--radius-pill);
  color: var(--color-ink-soft);
  font-size: 14px;
  font-weight: 550;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

.desktop-nav a.is-current {
  background: var(--color-panel-warm);
  color: var(--color-brand-strong);
  font-weight: 700;
}

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

.language-control {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  color: var(--color-ink-soft);
  cursor: pointer;
}

.language-button:hover {
  border-color: var(--color-brand);
  color: var(--color-ink);
}

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 172px;
  padding: 7px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-soft);
}

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

.language-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  width: 100%;
  padding: 8px 11px;
  border-radius: var(--radius-small);
  color: var(--color-ink-soft);
  text-decoration: none;
}

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

.menu-button {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  border-radius: 50%;
  background: var(--color-canvas);
  color: var(--color-ink);
  cursor: pointer;
}

.menu-button svg {
  width: 21px;
  height: 21px;
}

.mobile-drawer {
  display: none;
}

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

.mobile-drawer-inner {
  padding: 10px var(--gutter) 22px;
}

.mobile-drawer a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  padding: 11px 14px;
  border-radius: var(--radius-small);
  color: var(--color-ink);
  text-decoration: none;
}

.mobile-drawer a:hover,
.mobile-drawer a.is-current {
  background: var(--color-panel-warm);
  color: var(--color-brand-strong);
}

.mobile-language-label {
  margin: 16px 14px 5px;
  color: var(--color-ink-soft);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
}

.nav-veil {
  display: none;
}

.site-footer {
  margin-top: var(--section-space);
  overflow-x: clip;
  background: var(--color-panel);
  color: var(--color-ink);
}

.footer-shell {
  display: grid;
  grid-template-columns: minmax(250px, 1.35fr) repeat(3, minmax(150px, 1fr));
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 42px;
}

.footer-brand {
  max-width: 340px;
}

.footer-brand .site-brand {
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--color-ink-soft);
}

.footer-column h2 {
  margin-bottom: 14px;
  font-size: 14px;
  letter-spacing: .04em;
}

.footer-links {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  color: var(--color-ink-soft);
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 22px;
  padding-bottom: 26px;
  border-top: 1px solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: 13px;
}

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

.data-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  background: var(--color-canvas);
  color: var(--color-ink);
}

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

.data-table th {
  background: var(--color-panel);
  color: var(--color-ink);
  font-size: 13px;
  font-weight: 750;
}

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

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

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

.prose h2 {
  margin-top: 2.4em;
  scroll-margin-top: 96px;
}

.prose h3 {
  margin-top: 1.8em;
  scroll-margin-top: 96px;
}

.prose img {
  height: auto;
  margin: 28px auto;
  border-radius: var(--radius-card);
}

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

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

.tilt-card {
  transform: rotate(-2deg);
}

.decorated-section,
.hero,
.preview-hero {
  overflow-x: clip;
}

@media (max-width: 1080px) {
  :root {
    --gutter: 28px;
    --section-space: 84px;
  }

  .desktop-nav {
    gap: 2px;
  }

  .desktop-nav a {
    padding-inline: 10px;
    font-size: 13px;
  }

  .footer-shell {
    grid-template-columns: 1.3fr repeat(2, 1fr);
  }
}

@media (max-width: 860px) {
  .desktop-nav,
  .language-control {
    display: none;
  }

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

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

  .mobile-drawer {
    position: fixed;
    z-index: 102;
    top: var(--header-height);
    right: 0;
    left: 0;
    display: block;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    border-top: 1px solid var(--color-line);
    background: var(--color-canvas);
    color: var(--color-ink);
    box-shadow: var(--shadow-soft);
    overscroll-behavior: contain;
  }

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

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

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

  h1 {
    font-size: clamp(24px, 6vw, 30px);
    line-height: 1.18;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 18px;
    --section-space: 64px;
    --header-height: 68px;
  }

  body {
    font-size: 15.5px;
  }

  .site-brand-name {
    font-size: 17px;
  }

  .site-brand img {
    width: 29px;
    height: 29px;
  }

  .header-shell {
    gap: 10px;
  }

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

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

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

  .card {
    padding: 20px;
  }

  .panel {
    padding: 22px;
  }

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

  .footer-shell {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-top: 48px;
  }

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

  h2 {
    font-size: clamp(25px, 8vw, 32px);
  }

  h3 {
    font-size: 21px;
  }
}

@media (max-width: 370px) {
  :root {
    --gutter: 16px;
  }

  .site-brand-name {
    font-size: 15.5px;
  }

  .button {
    width: 100%;
  }
}

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

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

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