:root {
  --color-surface: #f9f9f9;
  --color-surface-alt: #f0f0f0;
  --color-surface-deep: #e3e4e4;
  --color-ink: #3f4a4a;
  --color-ink-soft: #616f70;
  --color-ink-muted: #788687;
  --color-line: #d8dada;
  --color-primary: #14828a;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #d9e8e9;
  --color-accent: #ec0818;
  --color-accent-ink: #ffffff;
  --color-highlight: #f7ced0;
  --color-focus: #e0000f;
  --color-contrast-surface: #132426;
  --color-contrast-ink: #e4e7e7;
  --color-contrast-line: #414f50;
  --color-contrast-accent: #f84450;
  --overlay-scrim: linear-gradient(180deg, rgba(19, 36, 38, 0.35) 0%, rgba(19, 36, 38, 0.72) 55%, rgba(19, 36, 38, 0.92) 100%);
  --font-heading: ui-monospace, SFMono-Regular, Menlo, Consolas, "PingFang SC", monospace;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 10.7px;
  --text-sm: 13.4px;
  --text-base: 15px;
  --text-lg: 18.8px;
  --text-xl: 23.4px;
  --text-2xl: 29.3px;
  --text-3xl: 36.6px;
  --text-4xl: 45.8px;
  --text-display: clamp(41px, 8.4vw, 107px);
  --text-figure: clamp(34px, 6.0vw, 77px);
  --weight-heading: 781;
  --weight-body: 400;
  --leading-body: 1.8;
  --leading-heading: 1.2;
  --tracking-heading: 0.027em;
  --radius-sm: 288px;
  --radius-md: 456px;
  --radius-lg: 623px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 0 0 1px rgba(236, 8, 24, 0.35);
  --shadow-2: 0 0 28px rgba(236, 8, 24, 0.35);
  --space-1: 7px;
  --space-2: 14px;
  --space-3: 21px;
  --space-4: 28px;
  --space-6: 42px;
  --space-8: 56px;
  --container: 1220px;
  --measure: 73ch;
  --gutter: 21px;
  --section-y: 81px;
  --section-y-lg: 113px;
}

/* ===================== 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);
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

[hidden] { display: none !important; }

/* ===================== 中文排版 ===================== */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-3);
  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-lg); }
h4 { font-size: var(--text-base); }

p { margin: 0 0 var(--space-3); }

ul, ol { margin: 0 0 var(--space-3); padding-left: 1.25em; }
li { margin-bottom: var(--space-1); }

strong { font-weight: var(--weight-heading); }

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.18s ease, text-decoration-color 0.18s ease;
}

a:hover {
  color: var(--color-accent);
  text-decoration-style: solid;
  text-decoration-color: var(--color-accent);
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.display {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.01em;
}

.figure-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}

.eyebrow {
  display: inline-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: 0.2em;
  color: var(--color-primary);
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: var(--border-thin);
  background-color: var(--color-primary);
}

.mark {
  padding: 0 0.3em;
  border-radius: var(--radius-pill);
  background-color: var(--color-highlight);
  color: var(--color-accent);
}

.accent-underline {
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

/* ===================== 布局 ===================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.measure { max-width: var(--measure); }

.section { padding-block: var(--section-y); }
.section--tight { padding-block: var(--space-6); }
.section--alt { background-color: var(--color-surface-alt); }

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

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

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4) var(--gutter);
}

.grid--split { grid-template-columns: minmax(0, 1fr); }

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

@media (min-width: 900px) {
  .grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
}

.dotted-rule {
  height: 0;
  margin: var(--space-6) 0;
  border: 0;
  border-top: var(--border-thin) dotted var(--color-line);
}

.dotted-rule--contrast { border-top-color: var(--color-contrast-line); }

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

.prose h2 { margin-top: var(--space-6); font-size: var(--text-xl); }
.prose h3 { margin-top: var(--space-4); font-size: var(--text-lg); }
.prose li { margin-bottom: var(--space-1); }

/* ===================== 胶囊 / 标签 / 按钮 ===================== */
.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  line-height: 1.4;
  text-decoration: none;
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-primary-ink) 78%, transparent);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.pill:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  text-decoration: none;
}

.pill--solid {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.pill--solid:hover {
  border-color: color-mix(in srgb, var(--color-primary) 78%, var(--color-contrast-surface));
  background-color: color-mix(in srgb, var(--color-primary) 78%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
}

.pill--accent {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.pill--accent:hover {
  border-color: var(--color-accent);
  background-color: color-mix(in srgb, var(--color-accent) 82%, var(--color-contrast-surface));
  color: var(--color-accent-ink);
}

.pill--ghost { background-color: transparent; }

.pill--contrast {
  border-color: var(--color-contrast-line);
  background-color: transparent;
  color: var(--color-contrast-ink);
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-contrast-ink) 16%, transparent);
}

.pill--contrast:hover {
  border-color: var(--color-contrast-accent);
  background-color: color-mix(in srgb, var(--color-contrast-accent) 18%, transparent);
  color: var(--color-accent-ink);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.tag--accent { background-color: var(--color-highlight); color: var(--color-accent); }

.tag--contrast {
  border: var(--border-thin) solid var(--color-contrast-line);
  background-color: transparent;
  color: var(--color-contrast-ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-primary-ink) 70%, transparent);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.btn--primary:hover {
  background-color: color-mix(in srgb, var(--color-primary) 80%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
}

.btn--accent {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn--ghost { background-color: transparent; }

/* 状态条与指示灯 */
.status-bar {
  height: var(--space-1);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
  overflow: hidden;
}

.status-bar__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background-image: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

.status-dot {
  display: inline-block;
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-primary);
  box-shadow: 0 0 8px color-mix(in srgb, var(--color-primary) 70%, transparent);
}

.status-dot--live {
  background-color: var(--color-contrast-accent);
  box-shadow: 0 0 8px var(--color-contrast-accent);
  animation: status-pulse 2.6s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.42; }
}

/* 面板 / 折叠 / 表格 */
.panel {
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-primary-ink) 82%, transparent),
              0 0 28px color-mix(in srgb, var(--color-primary) 10%, transparent);
}

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

.panel--deep h2,
.panel--deep h3 { color: var(--color-contrast-ink); }

.accordion {
  overflow: hidden;
  border: var(--border-thin) dotted var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-alt);
}

.accordion + .accordion { margin-top: var(--space-2); }

.accordion__summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  transition: background-color 0.18s ease;
}

.accordion__summary::-webkit-details-marker { display: none; }

.accordion__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--color-primary);
}

.accordion[open] .accordion__summary::after { content: "–"; color: var(--color-accent); }
.accordion__summary:hover { background-color: var(--color-primary-soft); }

.accordion__body {
  padding: 0 var(--space-4) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.table-wrap {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
}

.data-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.data-table th,
.data-table td {
  padding: var(--space-2) var(--space-3);
  border-bottom: var(--border-thin) dotted var(--color-line);
  text-align: left;
  vertical-align: top;
}

.data-table thead th {
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
}

.data-table tbody tr:nth-child(even) { background-color: var(--color-surface-alt); }
.data-table tbody tr:hover { background-color: var(--color-primary-soft); }
.data-table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* 胶囊筛选器 */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-2);
  border: var(--border-thin) dotted var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
}

.filter-capsule {
  padding: var(--space-1) var(--space-3);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.filter-capsule:hover { border-color: var(--color-primary); color: var(--color-primary); }

.filter-capsule[aria-pressed="true"] {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

/* 面包屑 */
.breadcrumb {
  border-bottom: var(--border-thin) dotted var(--color-line);
  background-color: var(--color-surface-alt);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-3) var(--gutter);
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--color-line);
}

.breadcrumb__item a { color: var(--color-ink-soft); text-decoration: none; }
.breadcrumb__item a:hover { color: var(--color-primary); text-decoration: underline; }
.breadcrumb__item[aria-current="page"] { color: var(--color-accent); }

/* 图片容器 */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-primary-ink) 80%, transparent);
}

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

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

.media__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image: var(--overlay-scrim);
  pointer-events: none;
}

.media__caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 2;
  margin: 0;
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

/* ===================== 入场显现 ===================== */
[data-js="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

[data-js="on"] [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

/* ===================== 头部 ===================== */
.skip-link {
  position: absolute;
  top: -200px;
  left: var(--space-3);
  z-index: 120;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  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); }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 110;
  height: 3px;
  background-color: color-mix(in srgb, var(--color-line) 70%, transparent);
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

.site-header {
  position: relative;
  z-index: 40;
  background-color: var(--color-surface);
}

.header-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-4) var(--gutter) var(--space-3);
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.brand {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  color: var(--color-ink);
  text-decoration: none;
}

.brand:hover { color: var(--color-ink); text-decoration: none; }

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-contrast-ink) 34%, transparent),
              0 0 18px color-mix(in srgb, var(--color-primary) 22%, transparent);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: 1.25;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.brand__sub {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.header-utility {
  display: flex;
  flex: 1 1 100%;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
}

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

.nav-toggle {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  cursor: pointer;
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-primary-ink) 70%, transparent);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

.nav-toggle[aria-expanded="true"] {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.nav-toggle__bars {
  display: inline-block;
  width: 16px;
  height: 12px;
  background-image: linear-gradient(currentColor, currentColor),
                    linear-gradient(currentColor, currentColor),
                    linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-size: 100% 2px;
  background-position: 0 0, 0 5px, 0 10px;
}

.nav-toggle__label { letter-spacing: 0.1em; }

.status-strip {
  border-top: var(--border-thin) solid var(--color-contrast-line);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.status-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-6);
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--gutter);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.status-strip__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  white-space: nowrap;
}

.status-strip__key { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }

.status-strip__value {
  color: var(--color-contrast-ink);
  font-variant-numeric: tabular-nums;
}

.status-strip__item--current .status-strip__value { color: var(--color-contrast-accent); }

/* 导航：移动抽屉 → 桌面纵向胶囊轨 */
.site-nav {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  width: min(320px, 86vw);
  padding: var(--space-8) var(--space-4) var(--space-6);
  overflow-y: auto;
  border-right: var(--border-thin) dotted var(--color-contrast-line);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  visibility: hidden;
  transform: translateX(-104%);
  transition: transform 0.26s ease, visibility 0.26s ease;
}

.site-nav[data-open] {
  visibility: visible;
  transform: translateX(0);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: navindex;
}

.site-nav__list li { margin: 0; }

.nav-capsule {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  text-decoration: none;
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-contrast-ink) 14%, transparent);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.nav-capsule::before {
  content: counter(navindex, decimal-leading-zero);
  counter-increment: navindex;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.nav-capsule:hover {
  border-color: var(--color-contrast-accent);
  background-color: color-mix(in srgb, var(--color-contrast-accent) 16%, transparent);
  color: var(--color-accent-ink);
  text-decoration: none;
}

.nav-capsule[aria-current="page"] {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: 0 0 24px color-mix(in srgb, var(--color-primary) 45%, transparent);
}

.nav-capsule[aria-current="page"]::before { color: var(--color-primary-ink); }

/* ===================== 页脚 ===================== */
.site-footer {
  position: relative;
  z-index: 5;
  padding-block: var(--space-8) var(--space-4);
  border-top: var(--border-thin) dotted var(--color-contrast-line);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  max-width: var(--container);
  margin-inline: auto;
  padding: 0 var(--gutter) var(--space-6);
  border-bottom: var(--border-thin) dotted var(--color-contrast-line);
}

.footer-col { min-width: 0; }

.footer-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.14em;
  color: var(--color-contrast-ink);
}

.footer-title::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-contrast-accent);
  box-shadow: 0 0 8px var(--color-contrast-accent);
}

.footer-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-pills li { margin: 0; }

.footer-note {
  margin: var(--space-3) 0 0;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links li { margin: 0; }

.footer-links a {
  align-self: flex-start;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) dotted var(--color-contrast-line);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
}

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

.footer-contact__line {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.footer-contact__note {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.footer-icp {
  margin: var(--space-3) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-accent);
}

.footer-mark {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-6) var(--gutter) var(--space-4);
}

.footer-mark__word {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.footer-mark__accent { color: var(--color-contrast-accent); }

.footer-mark__slogan {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.18em;
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3) var(--gutter) 0;
  border-top: var(--border-thin) dotted var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.footer-base p { margin: 0; }

/* ===================== 响应式 ===================== */
@media (min-width: 640px) {
  .brand__name { font-size: var(--text-lg); }
  .brand__sub { font-size: var(--text-xs); }
}

@media (min-width: 768px) {
  .footer-top { grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr) minmax(0, 1.2fr); }
}

@media (min-width: 900px) {
  .header-utility { flex: 0 0 auto; margin-left: auto; }
  .header-utility__note { display: block; }
  .nav-toggle { display: none; }
}

@media (min-width: 1024px) {
  body { padding-left: calc(var(--space-8) + var(--space-6)); }

  .site-nav {
    top: 50%;
    bottom: auto;
    left: var(--space-2);
    z-index: 60;
    width: auto;
    max-height: 88vh;
    padding: 0;
    overflow: visible;
    border-right: 0;
    background-color: transparent;
    color: var(--color-ink);
    visibility: visible;
    transform: translateY(-50%);
  }

  .site-nav[data-open] { transform: translateY(-50%); }

  .site-nav__list {
    align-items: center;
    gap: var(--space-2);
  }

  .nav-capsule {
    writing-mode: vertical-rl;
    text-orientation: upright;
    padding: var(--space-3) var(--space-2);
    border-color: var(--color-line);
    background-color: color-mix(in srgb, var(--color-surface) 88%, transparent);
    color: var(--color-ink);
    letter-spacing: 0.22em;
    box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-primary-ink) 80%, transparent);
  }

  .nav-capsule::before { letter-spacing: 0.08em; }

  .nav-capsule:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-soft);
    color: var(--color-primary);
  }

  .nav-capsule[aria-current="page"] {
    border-color: var(--color-primary);
    background-color: var(--color-primary);
    color: var(--color-primary-ink);
  }
}

@media (min-width: 1220px) {
  .header-bar { padding-inline: var(--gutter); }
}

/* ===================== 动效降级 ===================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  [data-js="on"] [data-reveal] {
    opacity: 1;
    transform: none;
  }
}