:root {
  --color-surface: #f8f8f7;
  --color-surface-alt: #eeeeed;
  --color-surface-deep: #e0e0df;
  --color-ink: #30312b;
  --color-ink-soft: #5c5f54;
  --color-ink-muted: #787c6f;
  --color-line: #d4d4d2;
  --color-primary: #658014;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e3e7d7;
  --color-accent: #4a0cf3;
  --color-accent-ink: #ffffff;
  --color-highlight: #d9cef6;
  --color-focus: #4500ff;
  --color-contrast-surface: #1b1f10;
  --color-contrast-ink: #e6e7e4;
  --color-contrast-line: #484b3f;
  --color-contrast-accent: #936df8;
  --overlay-scrim: linear-gradient(180deg, rgba(27, 31, 16, 0.35) 0%, rgba(27, 31, 16, 0.72) 55%, rgba(27, 31, 16, 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: 7.8px;
  --text-sm: 12.6px;
  --text-base: 16px;
  --text-lg: 25.9px;
  --text-xl: 41.9px;
  --text-2xl: 67.8px;
  --text-3xl: 109.7px;
  --text-4xl: 177.4px;
  --text-display: clamp(66px, 13.7vw, 175px);
  --text-figure: clamp(55px, 9.8vw, 126px);
  --weight-heading: 860;
  --weight-body: 400;
  --leading-body: 1.77;
  --leading-heading: 1.27;
  --tracking-heading: -0.022em;
  --radius-sm: 0px;
  --radius-md: 2px;
  --radius-lg: 3px;
  --radius-pill: 3px;
  --border-thin: 1px;
  --border-thick: 3px;
  --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: 1260px;
  --measure: 74ch;
  --gutter: 16px;
  --section-y: 82px;
  --section-y-lg: 115px;
}

/* ============================================================
   1. RESET
   ============================================================ */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

html.is-cmd-open { overflow: hidden; }

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;
}

main { display: block; }

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

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

a { color: inherit; }

ul, ol { margin: 0; padding: 0; }

[hidden] { display: none !important; }

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

#main-content { scroll-margin-top: calc(var(--space-8) + var(--space-4)); }

/* ============================================================
   2. 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);
  text-wrap: balance;
}

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

.eyebrow {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.lede {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.52;
  color: var(--color-ink-soft);
}

.mono,
.timestamp {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.timestamp {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.figure {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: var(--color-primary);
  white-space: nowrap;
}

.hl {
  background: var(--color-highlight);
  padding: 0 0.12em;
}

.marker {
  box-shadow: inset 0 -0.3em 0 0 color-mix(in srgb, var(--color-primary) 55%, transparent);
}

/* ============================================================
   3. 布局容器 / 分区 / 栅格
   ============================================================ */
.container {
  width: min(100% - var(--space-4), 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-6); }

.section--alt { background: var(--color-surface-alt); }
.section--deep { background: var(--color-surface-deep); }
.section--primary { background: var(--color-primary-soft); }

.section--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--contrast .eyebrow { color: var(--color-contrast-accent); }
.section--contrast .lede { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }
.section--contrast .timestamp { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.section--contrast .figure { color: var(--color-contrast-ink); }
.section--contrast a { color: var(--color-contrast-ink); }

.grid {
  display: grid;
  grid-template-columns: repeat(11, minmax(0, 1fr));
  gap: var(--gutter);
}

.grid--7 { grid-template-columns: repeat(7, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.span-2 { grid-column: span 2; }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-11 { grid-column: span 11; }

/* ============================================================
   4. 语义标签 / 按钮
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
}
.tag--service { background: var(--color-primary); color: var(--color-primary-ink); }
.tag--rule { background: var(--color-accent); color: var(--color-accent-ink); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
}
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--ghost {
  background: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}
.btn--ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }
.section--contrast .btn--ghost { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }

/* ============================================================
   5. 面包屑 / 正文 / 图片容器
   ============================================================ */
.breadcrumb {
  background: var(--color-surface-alt);
  padding-block: var(--space-3);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.breadcrumb li { display: flex; align-items: center; gap: 6px; color: var(--color-ink-muted); }
.breadcrumb li + li::before { content: "/"; color: var(--color-line); }
.breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.breadcrumb a:hover { color: var(--color-accent); border-bottom-color: var(--color-accent); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); }

.prose { max-width: var(--measure); }
.prose p { margin-bottom: var(--space-3); }
.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 a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
.prose ul, .prose ol { margin: 0 0 var(--space-3); padding-left: 1.2em; }
.prose li { margin-bottom: 6px; }

.media {
  position: relative;
  overflow: hidden;
  background: var(--color-surface-deep);
  border-radius: var(--radius-lg);
}
.media__img { width: 100%; height: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.media--wide .media__img { aspect-ratio: 21 / 9; }
.media--tall .media__img { aspect-ratio: 3 / 4; }
.media--square .media__img { aspect-ratio: 1 / 1; }
.media__scrim { position: absolute; inset: 0; background: var(--overlay-scrim); }
.media__body {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-4);
  color: var(--color-contrast-ink);
}
.media__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}
.media__meta {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

/* 显现动效协议：页面给区块加 data-reveal */
[data-reveal] {
  transform: translateY(8px);
  transition: transform 0.42s cubic-bezier(0.2, 0.7, 0.3, 1);
}
[data-reveal].is-in { transform: none; }

/* ============================================================
   6. HEADER
   ============================================================ */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: calc(var(--space-1) * -8);
  z-index: 300;
  padding: 10px 16px;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-decoration: none;
  border-radius: var(--radius-sm);
}
.skip-link:focus { top: var(--space-1); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: transparent;
  border-bottom: var(--border-thin) solid transparent;
}
.site-header.is-stuck {
  background: var(--color-surface);
  border-bottom-color: var(--color-line);
}

/* 滚动时间戳状态栏 */
.ticker {
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.ticker__track {
  display: flex;
  width: max-content;
  padding-block: 6px;
  animation: ticker-run 68s linear infinite;
  will-change: transform;
}
.ticker__item {
  flex: none;
  margin-right: var(--space-8);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, var(--color-contrast-surface));
}
.ticker__key { color: var(--color-contrast-accent); }

@keyframes ticker-run {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* 导航层 */
.masthead { position: relative; }

.masthead__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex: none;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
}
.brand__text { display: flex; flex-direction: column; gap: 2px; }
.brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.nav { margin-left: var(--space-4); }
.nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  list-style: none;
}
.nav__link {
  display: inline-block;
  padding: 4px 0;
  border-bottom: var(--border-thick) solid transparent;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--color-ink);
  white-space: nowrap;
}
.nav__link:hover { border-bottom-color: color-mix(in srgb, var(--color-primary) 65%, transparent); }
.nav__link[aria-current="page"] { border-bottom-color: var(--color-accent); }

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

.legend { display: flex; gap: var(--space-2); }
.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.legend__dot { display: block; width: 9px; height: 9px; }
.legend__dot--service { background: var(--color-primary); }
.legend__dot--rule { background: var(--color-accent); }

.tag-return {
  padding-bottom: 3px;
  border-bottom: var(--border-thick) solid var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-ink);
  white-space: nowrap;
}
.tag-return:hover { border-bottom-color: var(--color-accent); color: var(--color-accent); }

.cmd-btn,
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  appearance: none;
  padding: 8px 12px;
  background: color-mix(in srgb, var(--color-surface) 86%, transparent);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink);
  cursor: pointer;
  white-space: nowrap;
}
.cmd-btn:hover,
.nav-toggle:hover { border-color: var(--color-accent); color: var(--color-accent); }
.cmd-btn__kbd {
  padding: 1px 4px;
  background: var(--color-surface-deep);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

.nav-toggle { display: none; }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: var(--border-thick);
  background: var(--color-accent);
  z-index: 2;
}

/* 命令式跳转浮层 */
.cmd-panel {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh var(--space-2) var(--space-2);
}
.cmd-panel__scrim {
  position: absolute;
  inset: 0;
  padding: 0;
  border: 0;
  background: color-mix(in srgb, var(--color-contrast-surface) 84%, transparent);
  cursor: pointer;
}
.cmd-panel__box {
  position: relative;
  width: min(100%, 620px);
  padding: var(--space-4);
  background: var(--color-surface);
  border: var(--border-thick) solid var(--color-contrast-surface);
  border-radius: var(--radius-lg);
}
.cmd-panel__label {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.cmd-panel__input {
  width: 100%;
  padding: 12px var(--space-2);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-ink);
}
.cmd-panel__input::placeholder { color: var(--color-ink-muted); }
.cmd-panel__list {
  max-height: 46vh;
  margin-top: var(--space-3);
  overflow-y: auto;
  list-style: none;
}
.cmd-panel__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 12px var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-base);
  text-decoration: none;
  color: var(--color-ink);
}
.cmd-panel__link span {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}
.cmd-panel__link:hover,
.cmd-panel__link:focus-visible { background: var(--color-primary-soft); }
.cmd-panel__hint {
  margin: var(--space-2) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* ============================================================
   7. FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.footer__top { padding-block: var(--section-y) var(--space-6); }
.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}
.footer__head {
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}
.footer__links,
.footer__meta { list-style: none; }
.footer__links li { padding: 5px 0; font-size: var(--text-base); }
.footer__links a {
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  color: var(--color-contrast-ink);
}
.footer__links a:hover { border-bottom-color: var(--color-contrast-accent); }
.footer__meta li {
  padding: 5px 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, var(--color-contrast-surface));
}
.footer__meta .mono {
  margin-right: 8px;
  color: var(--color-contrast-accent);
}

.footer__word {
  overflow: hidden;
  padding-bottom: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(var(--text-2xl), 12.4vw, var(--text-3xl));
  line-height: 0.84;
  letter-spacing: -0.03em;
  white-space: nowrap;
  user-select: none;
  color: color-mix(in srgb, var(--color-contrast-ink) 18%, var(--color-contrast-surface));
}

.footer__base {
  padding-block: var(--space-3);
  background: color-mix(in srgb, var(--color-contrast-surface) 90%, var(--color-contrast-line));
}
.footer__base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, var(--color-contrast-surface));
}

/* ============================================================
   8. 响应式
   ============================================================ */
@media (max-width: 1100px) {
  .legend { display: none; }
}

@media (max-width: 900px) {
  .grid,
  .grid--7,
  .grid--3 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  [class*="span-"] { grid-column: 1 / -1; }

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

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

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    margin-left: 0;
    padding: var(--space-2) var(--space-4) var(--space-3);
    background: var(--color-surface);
    border-bottom: var(--border-thick) solid var(--color-accent);
  }
  .nav[data-open="true"] { display: block; }
  .nav__list { flex-direction: column; gap: 0; }
  .nav__link {
    display: block;
    width: 100%;
    padding: 13px 0;
    border-bottom: var(--border-thin) solid var(--color-line);
    font-size: var(--text-base);
  }
  .nav__link:hover { border-bottom-color: var(--color-line); }
  .nav__link[aria-current="page"] { border-bottom-color: var(--color-accent); }

  .cmd-btn__full { display: none; }
}

@media (max-width: 620px) {
  .masthead__inner { min-height: 58px; gap: var(--space-2); }
  .brand__sub { display: none; }
  .brand__name { font-size: var(--text-base); }
  .brand__mark { width: 30px; height: 30px; }
  .tag-return { font-size: var(--text-xs); letter-spacing: 0.06em; }
  .cmd-btn, .nav-toggle { padding: 7px 9px; }

  .footer__cols { grid-template-columns: 1fr; gap: var(--space-4); }
  .footer__word { font-size: clamp(var(--text-xl), 17vw, var(--text-2xl)); }
  .cmd-panel { padding-top: 8vh; }
  .cmd-panel__box { padding: var(--space-3); }
}

/* ============================================================
   9. 无障碍：减少动态
   ============================================================ */
@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;
  }
  .ticker__track { animation: none !important; }
  [data-reveal] { transform: none !important; }
}