:root {
  --color-surface: #fcfcfd;
  --color-surface-alt: #f3f3f5;
  --color-surface-deep: #e7e7e9;
  --color-ink: #4b4955;
  --color-ink-soft: #706e7d;
  --color-ink-muted: #7a7887;
  --color-line: #dcdcdf;
  --color-primary: #5340bf;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e4e2f4;
  --color-accent: #972ad5;
  --color-accent-ink: #ffffff;
  --color-highlight: #ead6f6;
  --color-focus: #9a1de2;
  --color-contrast-surface: #1a1826;
  --color-contrast-ink: #e5e4e7;
  --color-contrast-line: #474550;
  --color-contrast-accent: #b05ddf;
  --overlay-scrim: linear-gradient(180deg, rgba(26, 24, 38, 0.35) 0%, rgba(26, 24, 38, 0.72) 55%, rgba(26, 24, 38, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(34px, 6.6vw, 84px);
  --text-figure: clamp(28px, 4.7vw, 60px);
  --weight-heading: 739;
  --weight-body: 400;
  --leading-body: 1.79;
  --leading-heading: 1.19;
  --tracking-heading: -0.004em;
  --radius-sm: 14px;
  --radius-md: 16px;
  --radius-lg: 19px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(75, 73, 85, 0.08);
  --shadow-2: 0 18px 44px rgba(75, 73, 85, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1160px;
  --measure: 73ch;
  --gutter: 16px;
  --section-y: 82px;
  --section-y-lg: 115px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 96px;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: 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);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg, video { max-width: 100%; height: auto; display: block; }
ul, ol { margin: 0; padding: 0; }
li { list-style: none; }
button { font: inherit; color: inherit; }

/* ---------- 中文排版 ---------- */
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);
  color: var(--color-ink);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p { margin: 0 0 var(--space-2); text-wrap: pretty; }
p:last-child { margin-bottom: 0; }

.text-sm { font-size: var(--text-sm); }
.text-muted { color: var(--color-ink-muted); }
.text-soft { color: var(--color-ink-soft); }
.mono,
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

a {
  color: var(--color-primary);
  text-decoration-color: color-mix(in srgb, var(--color-primary) 40%, transparent);
  text-underline-offset: 3px;
}

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

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: var(--space-3);
  z-index: 200;
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus { top: var(--space-3); color: var(--color-primary-ink); }

/* ---------- 容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-2); }
.prose h2 { margin-top: var(--space-4); font-size: var(--text-xl); }
.prose h3 { margin-top: var(--space-3); font-size: var(--text-lg); }
.prose ul, .prose ol { padding-left: var(--space-3); }
.prose li { list-style: disc; margin-bottom: var(--space-1); }

.grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr)); }
.grid--tight { gap: var(--space-2); }

/* ---------- 区块 ---------- */
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background: var(--color-surface-alt); }
.section--deep { background: var(--color-surface-deep); }

.section--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4 { color: var(--color-contrast-ink); }

.section--contrast a { color: var(--color-contrast-accent); }

.section--grad {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-primary-soft) 58%, var(--color-highlight) 100%);
}

.diag-band {
  height: 6px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 46%, var(--color-highlight) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 58%);
}

/* ---------- 标尺分隔 ---------- */
.marker {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.marker__num {
  color: var(--color-accent);
  font-weight: 600;
}

.marker__text { white-space: nowrap; }

.marker::after {
  content: "";
  flex: 1 1 auto;
  height: 6px;
  background-image: linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 100%);
  background-size: 8px 100%;
  background-repeat: repeat-x;
  opacity: 0.9;
}

.section--contrast .marker { color: var(--color-contrast-ink); opacity: 0.72; }
.section--contrast .marker::after {
  background-image: linear-gradient(90deg, var(--color-contrast-line) 0 1px, transparent 1px 100%);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 22px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.22s ease, background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn--primary {
  background: linear-gradient(100deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

.btn--primary:hover {
  color: var(--color-primary-ink);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

.btn--ghost {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--color-line));
}

.btn--ghost:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn--quiet {
  background: var(--color-surface-alt);
  color: var(--color-ink);
  border-color: var(--color-line);
}

.btn--quiet:hover { color: var(--color-primary); }

.btn--on-dark {
  background: transparent;
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

.btn--on-dark:hover {
  color: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
}

.btn--sm { padding: 9px 16px; font-size: var(--text-sm); }

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: var(--text-sm);
  line-height: 1.5;
  white-space: nowrap;
}

.tag--accent {
  background: color-mix(in srgb, var(--color-accent) 16%, var(--color-surface));
  color: var(--color-accent);
}

.tag--quiet {
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
}

.tag--contrast {
  background: color-mix(in srgb, var(--color-contrast-accent) 22%, var(--color-contrast-surface));
  color: var(--color-contrast-accent);
}

.tag--status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: currentColor;
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  transition: transform 0.2s ease, box-shadow 0.22s ease;
}

.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); }

.card--soft {
  background: var(--color-surface-alt);
  box-shadow: none;
}

.card--grad {
  background: linear-gradient(140deg, var(--color-surface) 0%, var(--color-primary-soft) 58%, var(--color-highlight) 100%);
  border-color: transparent;
}

.card--contrast {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.card--contrast:hover { box-shadow: 0 22px 48px rgba(26, 24, 38, 0.42); }

.card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.card--contrast .card__meta { color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent); }

.card__title {
  margin: 0 0 var(--space-1);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
}

.card__text {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.card--contrast .card__text { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }

/* ---------- 数字 ---------- */
.figure {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.figure__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.figure__label {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.card--contrast .figure__value,
.section--contrast .figure__value { color: var(--color-contrast-accent); }

.card--contrast .figure__label,
.section--contrast .figure__label { color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent); }

.js [data-figure] .figure__value {
  opacity: 0.26;
  transition: opacity 0.55s ease;
}

.js [data-figure].is-lit .figure__value { opacity: 1; }

.metric-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.card--contrast .metric-row,
.section--contrast .metric-row { border-bottom-color: var(--color-contrast-line); }

.metric-row:last-child { border-bottom: 0; }

/* ---------- 图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-surface-deep);
  aspect-ratio: 16 / 10;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

.media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.media__caption {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  margin: 0;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
}

.media--cut::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 0 56%, color-mix(in srgb, var(--color-primary) 30%, transparent) 56.2% 100%);
  pointer-events: none;
}

/* ---------- 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.crumbs li { display: flex; align-items: center; gap: 10px; }

.crumbs li::after {
  content: "/";
  color: var(--color-line);
}

.crumbs li:last-child::after { content: none; }

.crumbs a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.crumbs a:hover { color: var(--color-primary); }

/* ---------- 显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translate3d(0, 16px, 0);
  transition: opacity 0.55s ease, transform 0.55s cubic-bezier(0.22, 0.7, 0.3, 1);
}

.js [data-reveal="d1"] { transition-delay: 0.07s; }
.js [data-reveal="d2"] { transition-delay: 0.14s; }
.js [data-reveal="d3"] { transition-delay: 0.21s; }
.js [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 头部 ---------- */
.site-header { position: relative; z-index: 60; }

.header-bar {
  position: sticky;
  top: 0;
  z-index: 55;
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.header-bar__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--space-3);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
  color: var(--color-ink);
}

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

.brand__mark {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  color: inherit;
}

.brand-signature {
  display: none;
  margin: 0;
  padding-left: 14px;
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  white-space: nowrap;
}

.header-utility {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}

.utility-link {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.utility-link:hover {
  color: var(--color-primary);
  border-bottom-color: currentColor;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.header-utility + .header-actions { margin-left: 0; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  font-size: var(--text-sm);
  cursor: pointer;
}

.nav-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: var(--radius-pill);
  background: currentColor;
}

/* ---------- 导航：移动端抽屉 / 桌面端侧边轨道 ---------- */
.site-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: min(360px, 88vw);
  padding: var(--space-6) var(--space-3) var(--space-4);
  overflow-y: auto;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-surface-alt) 58%, var(--color-primary-soft) 100%);
  box-shadow: var(--shadow-2);
  transform: translateX(103%);
  visibility: hidden;
  transition: transform 0.28s ease, visibility 0.28s ease;
}

.site-nav[data-open] {
  transform: none;
  visibility: visible;
}

.site-nav__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.site-nav__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.site-nav__close {
  padding: 8px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  cursor: pointer;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: 11px var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-ink);
  font-size: var(--text-base);
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.site-nav__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.site-nav__link:hover {
  background: color-mix(in srgb, var(--color-primary-soft) 72%, transparent);
  color: var(--color-primary);
}

.site-nav__link[aria-current="page"] {
  background: linear-gradient(100deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

.site-nav__link[aria-current="page"] .site-nav__num {
  color: color-mix(in srgb, var(--color-primary-ink) 74%, transparent);
}

.site-nav__link[aria-current="page"]:hover { color: var(--color-primary-ink); }

.site-nav__foot {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.site-nav__quick {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
}

.site-nav__quick:hover {
  color: var(--color-primary);
  border-bottom-color: currentColor;
}

.site-nav__cta { margin-top: var(--space-1); }

.rail-track {
  display: none;
  position: relative;
  width: 3px;
  height: 128px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-deep);
  overflow: hidden;
}

.rail-track__fill {
  position: absolute;
  inset: 0;
  transform: scaleY(0);
  transform-origin: top center;
  border-radius: inherit;
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

.rail-meta {
  display: none;
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 70;
  background: color-mix(in srgb, var(--color-contrast-surface) 64%, transparent);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.24s ease, visibility 0.24s ease;
}

.nav-scrim[data-open] {
  opacity: 1;
  visibility: visible;
}

body[data-nav-locked] { overflow: hidden; }

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 60;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.footer-giant {
  position: relative;
  padding: var(--space-8) var(--space-3) var(--space-3);
}

.footer-giant::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: linear-gradient(90deg, var(--color-contrast-accent) 0%, var(--color-highlight) 60%, var(--color-primary) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 40%);
}

.footer-giant__text {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: clamp(var(--text-3xl), 12.4vw, calc(var(--text-4xl) * 1.55));
  line-height: 0.94;
  letter-spacing: -0.03em;
  background-image: linear-gradient(96deg, var(--color-contrast-accent) 0%, var(--color-highlight) 58%, var(--color-primary-soft) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.footer-giant__line {
  margin: var(--space-3) 0 0;
  max-width: 40ch;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.footer-shell { padding: var(--space-6) var(--space-3); }

.footer-grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
  max-width: calc(var(--container) - var(--space-6));
}

.footer-col__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

.footer-links { display: flex; flex-direction: column; gap: 10px; }

.footer-links a {
  color: var(--color-contrast-ink);
  font-size: var(--text-base);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.footer-links a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: currentColor;
}

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

.footer-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 10px;
  font-size: var(--text-sm);
}

.footer-contact__key {
  min-width: 40px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
}

.footer-contact__value { color: var(--color-contrast-ink); }

.footer-contact__note {
  margin: var(--space-2) 0 0;
  max-width: 46ch;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.copy-btn {
  padding: 4px 12px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  background: transparent;
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease, background-color 0.18s ease;
}

.copy-btn:hover {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

.copy-btn.is-done {
  border-color: var(--color-contrast-accent);
  background: color-mix(in srgb, var(--color-contrast-accent) 20%, transparent);
  color: var(--color-contrast-accent);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  padding: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

.footer-legal__copy,
.footer-legal__icp { margin: 0; }

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.footer-legal__links a {
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
  text-decoration: none;
}

.footer-legal__links a:hover { color: var(--color-contrast-accent); }

.footer-top {
  margin-left: auto;
  padding: 8px 16px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.24s ease, visibility 0.24s ease, border-color 0.18s ease, color 0.18s ease;
}

.footer-top.is-on {
  opacity: 1;
  visibility: visible;
}

.footer-top:hover {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

/* ---------- 断点 ---------- */
@media (max-width: 1079.98px) {
  .header-utility { display: none; }
  .nav-toggle { display: inline-flex; }
}

@media (min-width: 1080px) {
  body { padding-left: 232px; }

  .header-bar {
    background: transparent;
    border-bottom: 0;
  }

  .header-bar__inner { padding-inline: var(--space-4); }

  .brand-signature { display: block; }

  .header-utility { display: flex; }

  .nav-toggle,
  .site-nav__close { display: none; }

  .site-nav {
    position: fixed;
    inset-block: 0;
    left: 0;
    right: auto;
    z-index: 50;
    width: 232px;
    padding: var(--space-8) var(--space-3) var(--space-4);
    gap: var(--space-4);
    background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-surface-alt) 44%, var(--color-primary-soft) 100%);
    border-right: var(--border-thin) solid var(--color-line);
    box-shadow: none;
    transform: none;
    visibility: visible;
    overflow-y: auto;
  }

  .site-nav__linked .site-nav__quick,
  .site-nav__quick,
  .site-nav__cta { display: none; }

  .site-nav__list { gap: 4px; }

  .site-nav__link { padding: 12px var(--space-2); }

  .site-nav__foot {
    gap: var(--space-3);
    margin-top: auto;
  }

  .rail-track { display: block; }
  .rail-meta { display: block; }

  .site-footer { margin-left: -232px; }
  .footer-shell { padding-inline: var(--space-6) var(--space-3); padding-left: calc(232px + var(--space-4)); }
  .footer-giant { padding-left: calc(232px + var(--space-4)); }
}

@media (max-width: 900px) {
  .brand-signature { display: none; }
}

@media (max-width: 560px) {
  .header-cta { display: none; }
  .header-actions { margin-left: auto; }
  .brand__name { font-size: var(--text-base); }
  .footer-giant__line { max-width: 100%; }
  .footer-top { margin-left: 0; }
}

@media (max-width: 400px) {
  .nav-toggle__text { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .js [data-reveal] { opacity: 1; transform: none; }
  .js [data-figure] .figure__value { opacity: 1; }
  .footer-top { opacity: 1; visibility: visible; }
}