:root {
  --color-surface: #fafafa;
  --color-surface-alt: #f0f0f0;
  --color-surface-deep: #e3e2e3;
  --color-ink: #37313a;
  --color-ink-soft: #665d6a;
  --color-ink-muted: #827887;
  --color-line: #d7d6d7;
  --color-primary: #9c26d9;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #eddcf5;
  --color-accent: #318603;
  --color-accent-ink: #ffffff;
  --color-highlight: #d6e5ce;
  --color-focus: #2c8000;
  --color-contrast-surface: #1c1222;
  --color-contrast-ink: #e6e4e7;
  --color-contrast-line: #48404d;
  --color-contrast-accent: #5af906;
  --overlay-scrim: linear-gradient(180deg, rgba(28, 18, 34, 0.35) 0%, rgba(28, 18, 34, 0.72) 55%, rgba(28, 18, 34, 0.92) 100%);
  --font-heading: "Source Han Sans SC", "Noto Sans SC", SimHei, "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 9.3px;
  --text-sm: 13.9px;
  --text-base: 17px;
  --text-lg: 25.5px;
  --text-xl: 38.2px;
  --text-2xl: 57.4px;
  --text-3xl: 86.1px;
  --text-4xl: 129.1px;
  --text-display: clamp(54px, 11.1vw, 142px);
  --text-figure: clamp(45px, 8.0vw, 102px);
  --weight-heading: 875;
  --weight-body: 400;
  --leading-body: 1.69;
  --leading-heading: 1.16;
  --tracking-heading: -0.024em;
  --radius-sm: 1px;
  --radius-md: 1px;
  --radius-lg: 1px;
  --radius-pill: 1px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1220px;
  --measure: 71ch;
  --gutter: 16px;
  --section-y: 93px;
  --section-y-lg: 130px;
}

/* ============ reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
}
body.is-nav-open { overflow: hidden; }
h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: var(--border-thick) solid var(--color-focus); outline-offset: 3px; }

/* ============ type scale ============ */
.t-display { font-size: var(--text-display); font-weight: 900; line-height: 1.02; }
.t-4xl { font-size: var(--text-4xl); font-weight: 900; }
.t-3xl { font-size: var(--text-3xl); font-weight: 900; }
.t-2xl { font-size: var(--text-2xl); font-weight: 800; }
.t-xl { font-size: var(--text-xl); font-weight: 800; }
.t-lg { font-size: var(--text-lg); font-weight: 700; }
.t-base { font-size: var(--text-base); font-weight: 400; }
.t-sm { font-size: var(--text-sm); }
.t-xs { font-size: var(--text-xs); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ============ layout ============ */
.container,
.hero__inner,
.site-footer__inner {
  width: min(100% - calc(var(--space-3) * 2), var(--container));
  margin-inline: auto;
}
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-8); }
.section--deep {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--alt { background-color: var(--color-surface-alt); }
.section--deep .eyebrow { color: var(--color-contrast-accent); }
.section--deep .eyebrow::before { background-color: var(--color-contrast-accent); }
.section--deep .link-inline { text-decoration-color: var(--color-contrast-line); }
.section--deep .link-inline:hover { color: var(--color-contrast-accent); }
.section--deep :focus-visible,
.hero :focus-visible,
.footer-top :focus-visible,
.site-header :focus-visible { outline-color: var(--color-contrast-accent); }

.hero {
  position: relative;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: calc(var(--space-8) + var(--space-6)) var(--space-8);
}
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: var(--gutter);
}
.grid > * { grid-column: span 7; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--space-3); }
.rule { border: 0; border-block-start: var(--border-thin) solid var(--color-line); margin: 0; }
.rule--deep { border-block-start-color: var(--color-contrast-line); }

/* ============ small parts ============ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.eyebrow::before { content: ""; width: 22px; height: var(--border-thick); background-color: var(--color-accent); }
.tag {
  display: inline-block;
  padding: 2px var(--space-1);
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
}
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}
.display-figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: var(--color-contrast-accent);
}
.display-figure--ink { color: var(--color-primary); }
.figure-unit {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}
.section--deep .figure-unit { color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent); }
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-contrast-accent);
  border-radius: var(--radius-sm);
  animation: dot-pulse 2.4s ease-in-out infinite;
}
.status-line {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
}
@keyframes dot-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.22; }
}

/* ============ panels & links ============ */
.panel {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
  transition: border-color 0.22s ease, transform 0.22s ease, background-color 0.22s ease;
}
.panel--link:hover, .panel--link:focus-visible {
  border-color: var(--color-accent);
  transform: translateX(2px);
  background-color: var(--color-highlight);
}
.section--deep .panel { border-color: var(--color-contrast-line); }
.section--deep .panel--link:hover,
.section--deep .panel--link:focus-visible {
  border-color: var(--color-contrast-accent);
  background-color: color-mix(in srgb, var(--color-contrast-accent) 12%, transparent);
}
.cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-base);
  color: var(--color-ink);
  transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}
.cta::after { content: "→"; font-family: var(--font-mono); }
.cta:hover, .cta:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: var(--color-highlight);
  transform: translateX(2px);
}
.cta--primary { border-color: var(--color-primary); color: var(--color-primary); }
.cta--primary:hover, .cta--primary:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
  background-color: var(--color-primary);
}
.cta--deep { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
.cta--deep:hover, .cta--deep:focus-visible {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
  background-color: color-mix(in srgb, var(--color-contrast-accent) 14%, transparent);
}
.link-inline {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: var(--border-thin);
  text-decoration-color: var(--color-line);
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}
.link-inline:hover, .link-inline:focus-visible {
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
}

/* ============ breadcrumb ============ */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb__sep { color: var(--color-line); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); }
.breadcrumb--deep { color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent); }
.breadcrumb--deep .breadcrumb__sep { color: var(--color-contrast-line); }
.breadcrumb--deep [aria-current="page"] { color: var(--color-contrast-accent); }

/* ============ media frames ============ */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}
.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--narrow { aspect-ratio: 1 / 2; }
.media--square { aspect-ratio: 1 / 1; }
.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}
.media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.media__caption {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  z-index: 2;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
}
.media__label {
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 0;
  z-index: 2;
  padding: 2px var(--space-1);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
}

/* ============ skip link ============ */
.skip-link {
  position: absolute;
  inset-block-start: var(--space-2);
  inset-inline-start: var(--space-2);
  z-index: 200;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
  border: var(--border-thin) solid var(--color-contrast-accent);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  transform: translateY(-180%);
}
.skip-link:focus { transform: none; }

/* ============ header ============ */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 60;
  color: var(--color-contrast-ink);
  background-color: transparent;
  border-block-end: var(--border-thin) solid transparent;
  transition: background-color 0.28s ease, border-color 0.28s ease;
}
.site-header.is-solid {
  background-color: var(--color-contrast-surface);
  border-block-end-color: var(--color-contrast-line);
}
.site-header__inner {
  width: min(100% - calc(var(--space-3) * 2), var(--container));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-2);
}
.brand-group {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}
.brand__mark {
  flex: none;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: var(--text-lg);
  line-height: 1;
  border-radius: var(--radius-sm);
}
.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-base);
  letter-spacing: var(--tracking-heading);
  white-space: nowrap;
}
.brand__line {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
  white-space: nowrap;
}
.brand-hint {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  border-inline-start: var(--border-thin) solid var(--color-contrast-line);
  padding-inline-start: var(--space-2);
}
.nav { display: flex; align-items: center; gap: var(--space-4); }
.nav__list { display: flex; align-items: center; gap: var(--space-3); }
.nav__link {
  display: inline-block;
  padding-block: var(--space-1);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
  border-block-end: var(--border-thick) solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.nav__link:hover, .nav__link:focus-visible { color: var(--color-contrast-accent); border-block-end-color: var(--color-contrast-accent); }
.nav__link[aria-current="page"] { color: var(--color-contrast-accent); border-block-end-color: var(--color-contrast-accent); }
.nav__tail { display: flex; align-items: center; gap: var(--space-2); }
.nav__quick {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--color-contrast-line);
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}
.nav__quick:hover, .nav__quick:focus-visible { color: var(--color-contrast-accent); text-decoration-color: var(--color-contrast-accent); }
.nav__cta {
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-sm);
  color: var(--color-contrast-accent);
  transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}
.nav__cta:hover, .nav__cta:focus-visible {
  border-color: var(--color-contrast-accent);
  background-color: color-mix(in srgb, var(--color-contrast-accent) 14%, transparent);
  transform: translateX(2px);
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
}
.nav-toggle__bars,
.nav-toggle__bars::before {
  display: block;
  width: 18px;
  height: var(--border-thick);
  background-color: var(--color-contrast-ink);
}
.nav-toggle__bars { position: relative; }
.nav-toggle__bars::before { content: ""; position: absolute; inset-inline-start: 0; inset-block-start: -6px; }
.nav-toggle[aria-expanded="true"] { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars,
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { background-color: var(--color-contrast-accent); }
.scroll-progress {
  height: var(--border-thick);
  background-color: color-mix(in srgb, var(--color-contrast-line) 60%, transparent);
}
.scroll-progress__bar {
  display: block;
  height: 100%;
  background-color: var(--color-contrast-accent);
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform 0.12s linear;
}

/* ============ footer ============ */
.site-footer { background-color: var(--color-surface-alt); color: var(--color-ink); }
.footer-top {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--section-y) var(--space-8);
  border-block-end: var(--border-thin) solid var(--color-contrast-line);
}
.footer-top .site-footer__inner {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(0, 2.2fr);
  gap: var(--space-8);
  align-items: start;
}
.footer-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-contrast-accent);
  margin-block-end: var(--space-2);
}
.footer-top__note {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
  max-width: 32ch;
}
.footer-index {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  border-block-start: var(--border-thin) solid var(--color-contrast-line);
}
.footer-index__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: var(--space-2);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-contrast-ink);
  border-block-end: var(--border-thin) solid var(--color-contrast-line);
  transition: color 0.2s ease, transform 0.2s ease;
}
.footer-index__link:hover, .footer-index__link:focus-visible {
  color: var(--color-contrast-accent);
  transform: translateX(3px);
}
.footer-index__no {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 52%, transparent);
}
.footer-bottom { padding-block: var(--space-8); background-color: var(--color-surface-alt); }
.footer-bottom__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  gap: var(--space-6);
  align-items: start;
}
.footer-brand {
  font-family: var(--font-heading);
  font-weight: 875;
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
}
.footer-legal {
  margin-block-start: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-block-start: var(--space-3);
  padding-block-start: var(--space-3);
  border-block-start: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
}
.footer-legal-links a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--color-line);
}
.footer-legal-links a:hover, .footer-legal-links a:focus-visible {
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
}
.footer-contact { display: grid; gap: var(--space-1); font-size: var(--text-sm); color: var(--color-ink-soft); }
.footer-contact li { border-block-end: var(--border-thin) solid var(--color-line); padding-block-end: var(--space-1); }
.footer-operator {
  margin-block-start: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* ============ scroll-driven states ============ */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
html.js [data-reveal].is-in { opacity: 1; transform: none; }
.digits { display: inline-flex; align-items: baseline; }
.digits__d {
  display: inline-block;
  opacity: 0.14;
  transform: translateY(0.14em);
  transition: opacity 0.34s ease, transform 0.34s ease;
  transition-delay: calc(var(--i, 0) * 62ms);
}
.is-lit .digits__d { opacity: 1; transform: none; }

/* ============ responsive ============ */
@media (max-width: 1023px) {
  .brand-hint { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav {
    position: fixed;
    inset: 0;
    z-index: 50;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
    padding: calc(var(--space-8) + var(--space-3)) var(--space-3) var(--space-6);
    background-color: var(--color-contrast-surface);
    overflow-y: auto;
  }
  .nav[data-open] { display: flex; }
  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-block-start: var(--border-thin) solid var(--color-contrast-line);
  }
  .nav__link {
    display: block;
    padding-block: var(--space-3);
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 800;
    border-block-end: var(--border-thin) solid var(--color-contrast-line);
    border-block-start: 0;
  }
  .nav__tail { flex-direction: column; align-items: flex-start; gap: var(--space-3); }
  .nav__cta { font-size: var(--text-base); padding: var(--space-1) var(--space-3); }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-2, .col-3, .col-4 { grid-column: span 1; }
  .col-5, .col-6, .col-7 { grid-column: span 2; }
  .footer-top .site-footer__inner { grid-template-columns: 1fr; gap: var(--space-6); }
  .footer-bottom__inner { grid-template-columns: 1fr; gap: var(--space-6); }
}
@media (max-width: 640px) {
  :root { --section-y: 64px; --section-y-lg: 84px; }
  .brand__line { display: none; }
  .grid { grid-template-columns: 1fr; }
  .col-2, .col-3, .col-4, .col-5, .col-6, .col-7 { grid-column: 1 / -1; }
  .footer-index { grid-template-columns: 1fr; }
  .nav__link { font-size: var(--text-lg); }
  .eyebrow { letter-spacing: 0.12em; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .digits__d { opacity: 1; transform: none; }
  .panel--link:hover, .cta:hover, .nav__cta:hover, .footer-index__link:hover { transform: none; }
  .scroll-progress__bar { transition: none; }
}