/* =========================================================
   永盈会电子站 / site.css
   高原夜航档案系统：墨底 + 暖纸面板 + 唐卡矿物色
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 150px;
}

body,
h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, figure { margin: 0; }

ul[class], ol[class] { list-style: none; padding: 0; }

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

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

/* ---------- 2. TOKENS ---------- */
:root {
  --ink: #0E1116;
  --ink-panel: #161B23;
  --ink-deep: #0A0D12;
  --paper: #E8DFCB;
  --ochre: #B24A2E;
  --ochre-lit: #D96A45;
  --turquoise: #2E8C7A;
  --turquoise-lit: #4FBBA5;
  --night: #1F3A5F;
  --brass: #C9A227;
  --slate: #9AA7B4;
  --snow: #F5F2EA;
  --ink-text: #14181E;

  --line: rgba(201, 162, 39, 0.34);
  --line-soft: rgba(154, 167, 180, 0.18);
  --line-paper: rgba(20, 24, 30, 0.24);

  --font-sans: system-ui, -apple-system, "Source Han Sans SC", "Noto Sans SC",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;

  --wrap: 1240px;
  --gutter: clamp(16px, 4vw, 48px);
  --radius: 2px;
}

/* ---------- 3. BASE / 中文排版 ---------- */
body {
  background-color: var(--ink);
  color: var(--snow);
  font-family: var(--font-sans);
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  color: var(--snow);
  text-wrap: balance;
}

h1 { font-size: clamp(34px, 6vw, 76px); letter-spacing: -0.03em; }
h2 { font-size: clamp(25px, 3.4vw, 42px); }
h3 { font-size: clamp(18px, 2vw, 25px); line-height: 1.32; }
h4 { font-size: clamp(15px, 1.4vw, 18px); }

a { color: var(--ochre-lit); text-decoration: none; }
a:hover { color: var(--brass); }

strong, b { font-weight: 800; }

::selection { background: var(--ochre); color: var(--snow); }

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

.site-main { display: block; min-height: 55vh; }

/* ---------- 4. 基础工具类 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass);
}

.prose { color: var(--slate); line-height: 1.8; }
.prose p { max-width: 66ch; }
.prose p + p { margin-top: 1.2em; }
.prose strong { color: var(--snow); }

/* ---------- 5. 章节 / 面板 / 纸面 ---------- */
.section { padding-block: clamp(38px, 7vw, 86px); }

.section--paper { background-color: var(--paper); }

.on-paper { color: var(--ink-text); }
.on-paper h1,
.on-paper h2,
.on-paper h3,
.on-paper h4 { color: var(--ink-text); }
.on-paper .eyebrow { color: var(--ochre); }
.on-paper .prose { color: rgba(20, 24, 30, 0.78); }
.on-paper .prose strong { color: var(--ink-text); }

.panel {
  position: relative;
  border: 1px solid var(--line);
  background-color: var(--ink-panel);
  padding: clamp(18px, 3vw, 32px);
  border-radius: var(--radius);
}

.panel--paper {
  background-color: var(--paper);
  color: var(--ink-text);
  border-color: var(--line-paper);
  background-image:
    repeating-linear-gradient(0deg, rgba(20, 24, 30, 0.05) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(90deg, rgba(20, 24, 30, 0.05) 0 1px, transparent 1px 24px);
}

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding-bottom: 14px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--line-soft);
}

.panel--paper .panel__head { border-bottom-color: var(--line-paper); }

.panel__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--brass);
}

.panel--paper .panel__num { color: var(--ochre); }

.panel__title {
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: inherit;
}

.panel__tag {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--turquoise-lit);
  border: 1px solid rgba(79, 187, 165, 0.42);
  padding: 3px 8px;
  border-radius: var(--radius);
}

.panel--paper .panel__tag {
  color: #1C6A5C;
  border-color: rgba(28, 106, 92, 0.45);
}

/* ---------- 6. 栅格 / 卡片 / 标签 ---------- */
.grid { display: grid; gap: clamp(14px, 2vw, 24px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 1fr) minmax(0, 1.62fr); }

.card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  border: 1px solid var(--line-soft);
  background-color: rgba(31, 58, 95, 0.16);
  border-radius: var(--radius);
}

.card__title {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--slate);
  background-color: rgba(201, 162, 39, 0.06);
}

.tag--ochre {
  color: var(--ochre-lit);
  border-color: rgba(217, 106, 69, 0.45);
  background-color: rgba(178, 74, 46, 0.14);
}

.tag--turq {
  color: var(--turquoise-lit);
  border-color: rgba(79, 187, 165, 0.42);
  background-color: rgba(46, 140, 122, 0.14);
}

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  padding: 2px 7px;
  border-radius: var(--radius);
  background-color: var(--ochre);
  color: var(--snow);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease,
    border-color 0.18s ease, transform 0.18s ease;
}

.btn--sm { padding: 9px 14px; font-size: 13px; }

.btn--ochre {
  background-color: var(--ochre);
  color: var(--snow);
  border-color: rgba(201, 162, 39, 0.5);
}
.btn--ochre:hover { background-color: var(--ochre-lit); color: #FFFFFF; }

.btn--ghost {
  background-color: transparent;
  color: var(--snow);
  border-color: var(--line);
}
.btn--ghost:hover {
  color: var(--brass);
  border-color: var(--brass);
  background-color: rgba(201, 162, 39, 0.08);
}

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

/* ---------- 8. 面包屑 ---------- */
.crumbs {
  border-bottom: 1px solid var(--line-soft);
  padding-block: 13px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.crumbs__link { color: var(--slate); }
.crumbs__link:hover { color: var(--brass); }
.crumbs__sep { color: var(--ochre); }
.crumbs__current { color: var(--snow); }

/* ---------- 9. 数据表 ---------- */
.dtable-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background-color: var(--ink-panel);
}

.dtable {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}

.dtable th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: left;
  color: var(--brass);
  background-color: rgba(201, 162, 39, 0.07);
  border-bottom: 1px solid var(--line);
  padding: 10px 12px;
  white-space: nowrap;
}

.dtable td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
  color: var(--slate);
}

.dtable tbody tr:nth-child(even) { background-color: rgba(22, 27, 35, 0.75); }
.dtable tbody tr:hover { background-color: rgba(31, 58, 95, 0.42); }
.dtable tbody tr:last-child td { border-bottom: 0; }
.dtable .mono,
.dtable td.mono { color: var(--turquoise-lit); }

/* ---------- 10. 图片容器（页面阶段放占位） ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--ink-panel);
}

.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame > img,
.media-frame > picture > img,
.media-frame__inner {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-frame--pending {
  background-image:
    repeating-linear-gradient(90deg, rgba(201, 162, 39, 0.16) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(0deg, rgba(46, 140, 122, 0.14) 0 1px, transparent 1px 28px);
}

.media-frame__label {
  position: absolute;
  inset: 0 auto auto 0;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--brass);
  background-color: var(--ink);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.media-frame__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 10px 12px;
  font-size: 12px;
  color: var(--snow);
  background-image: linear-gradient(180deg, rgba(14, 17, 22, 0) 0%, rgba(14, 17, 22, 0.9) 100%);
}

/* ---------- 11. 滚动点亮 ---------- */
[data-lit] {
  transition:
    opacity 0.5s ease,
    transform 0.5s ease,
    border-color 0.5s ease,
    box-shadow 0.5s ease;
}

html[data-reveal="ready"] [data-lit]:not(.is-lit) {
  opacity: 0;
  transform: translateY(16px);
}

[data-lit].is-lit {
  opacity: 1;
  transform: none;
  border-color: var(--brass);
  box-shadow: 0 0 0 1px rgba(201, 162, 39, 0.16);
}

/* ---------- 12. SKIP LINK ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: 8px;
  z-index: 200;
  transform: translateY(-200%);
  padding: 10px 16px;
  border-radius: var(--radius);
  background-color: var(--brass);
  color: var(--ink-text);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.02em;
  transition: transform 0.18s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--snow);
  outline-offset: 2px;
  color: var(--ink-text);
}

/* ---------- 13. HEADER ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--ink);
  border-bottom: 1px solid var(--line);
}

/* 13.1 信息条 */
.topline {
  background-color: var(--ink-deep);
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  color: var(--slate);
}

.topline__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px clamp(10px, 2vw, 26px);
  min-height: 38px;
  padding-block: 6px;
}

.topline__brand {
  color: var(--snow);
  font-weight: 700;
  letter-spacing: 0.18em;
  white-space: nowrap;
}

.topline__note {
  flex: 1 1 220px;
  min-width: 0;
  color: var(--slate);
}

.topline__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  margin-left: auto;
}

.topline__status { color: var(--turquoise-lit); white-space: nowrap; }
.topline__icp { color: var(--slate); white-space: nowrap; }

.status-dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--turquoise-lit);
  box-shadow: 0 0 0 3px rgba(79, 187, 165, 0.18);
  animation: dotPulse 2.8s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(79, 187, 165, 0.18); }
  50% { box-shadow: 0 0 0 6px rgba(79, 187, 165, 0.05); }
}

/* 13.2 品牌层 */
.masthead {
  background-color: var(--ink);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(201, 162, 39, 0.055) 0 1px,
    transparent 1px 88px
  );
}

.masthead__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--snow);
  min-width: 0;
}

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

.brand__mark {
  flex: none;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background-color: var(--ochre);
  border: 1px solid var(--brass);
  border-radius: var(--radius);
  color: var(--snow);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0;
  line-height: 1;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.brand__name {
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.1;
  transition: color 0.18s ease;
}

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

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--slate);
  line-height: 1.1;
}

.masthead__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

/* 13.3 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  background-color: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--snow);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  line-height: 1;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

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

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background-color: currentColor;
  border-radius: 1px;
}

.nav-toggle__label { white-space: nowrap; }

/* 13.4 路径带（桌面：六格并置 / 移动：竖向抽屉） */
.pathrail {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  background-color: #10141B;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(201, 162, 39, 0.05) 0 1px,
    transparent 1px 64px
  );
}

.pathrail__inner { padding-block: 0; }

.pathrail__list {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.pathrail__cell { min-width: 0; }

.pathrail__item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 11px 16px 12px;
  color: var(--slate);
  text-decoration: none;
  border-radius: 0;
  box-shadow: inset 1px 0 0 var(--line-soft);
  transition: background-color 0.18s ease, color 0.18s ease;
}

.pathrail__num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--brass);
  line-height: 1.2;
}

.pathrail__label {
  font-size: 14.5px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--snow);
  line-height: 1.3;
}

.pathrail__desc {
  display: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--slate);
  line-height: 1.5;
}

.pathrail__item:hover { background-color: rgba(31, 58, 95, 0.6); }
.pathrail__item:hover .pathrail__label { color: var(--ochre-lit); }

.pathrail__item[aria-current="page"] {
  background-color: var(--ochre);
  box-shadow: inset 0 0 0 1px rgba(245, 242, 234, 0.24);
}
.pathrail__item[aria-current="page"] .pathrail__label,
.pathrail__item[aria-current="page"] .pathrail__num,
.pathrail__item[aria-current="page"] .pathrail__desc { color: var(--snow); }

.pathrail__item:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: -2px;
}

.pathrail__head { display: none; }

.pathrail__close { display: none; }

/* 13.5 阅读进度刻度 */
.scroll-progress {
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(
    90deg,
    var(--ochre) 0%,
    var(--brass) 55%,
    var(--turquoise-lit) 100%
  );
  pointer-events: none;
}

/* ---------- 14. FOOTER ---------- */
.site-footer {
  position: relative;
  background-color: var(--ink-deep);
  border-top: 1px solid var(--brass);
  color: var(--slate);
  font-size: 14px;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 140px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(201, 162, 39, 0.07) 0 1px,
    transparent 1px 56px
  );
  pointer-events: none;
}

.footer__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.2fr;
  gap: 0;
  padding-block: clamp(32px, 5vw, 56px);
}

.footer__col {
  min-width: 0;
  padding-inline: clamp(14px, 2.4vw, 30px);
  border-left: 1px solid var(--line-soft);
}

.footer__col--brand {
  padding-left: 0;
  border-left: 0;
}

.footer__col:last-child { padding-right: 0; }

.footer__eyebrow {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brass);
}

.footer__word {
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--snow);
}

.footer__lede {
  margin-top: 12px;
  max-width: 34ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--slate);
}

.footer__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer__list--plain { gap: 12px; }

.footer__link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  font-size: 14px;
  color: var(--snow);
  transition: color 0.16s ease;
}

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

.footer__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ochre-lit);
}

.footer__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brass);
}

.footer__v {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--snow);
  word-break: break-word;
}

.footer__note {
  margin-top: 16px;
  padding-left: 10px;
  border-left: 2px solid var(--ochre);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
}

.footer__legal {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 26px;
  padding-block: 18px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.footer__copy { margin-right: auto; color: var(--slate); }

.footer__legal-list {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer__legal .footer__link {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.footer__legal .footer__link:hover { color: var(--brass); }

.footer__icp { color: var(--slate); }

/* ---------- 15. 响应式：平板 ---------- */
@media (max-width: 1100px) and (min-width: 861px) {
  .pathrail__list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .pathrail__item { padding: 10px 14px; }
}

@media (max-width: 980px) {
  .footer__grid { grid-template-columns: 1fr 1fr; row-gap: 30px; }
  .footer__col--brand { grid-column: 1 / -1; padding-right: 0; }
  .footer__col--brand + .footer__col { border-left: 0; padding-left: 0; }
  .footer__col:last-child { padding-right: 0; }
}

/* ---------- 16. 响应式：移动 ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }

  .pathrail {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 120;
    max-height: 100dvh;
    overflow-y: auto;
    border-bottom: 1px solid var(--brass);
    background-color: #0C1014;
    background-image: repeating-linear-gradient(
      90deg,
      rgba(201, 162, 39, 0.05) 0 1px,
      transparent 1px 48px
    );
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.65);
    transform: translateY(-101%);
    visibility: hidden;
    transition: transform 0.3s cubic-bezier(0.22, 0.61, 0.36, 1), visibility 0.3s;
  }

  .pathrail[data-open="true"] {
    transform: translateY(0);
    visibility: visible;
  }

  html[data-nav-open="true"] { overflow: hidden; }

  .pathrail__inner { padding-block: 14px 12px; }

  .pathrail__head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 12px;
    margin-bottom: 4px;
    border-bottom: 1px solid var(--line);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
  }

  .pathrail__headnum { color: var(--brass); }
  .pathrail__headtxt { color: var(--slate); font-size: 10.5px; }

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

  .pathrail__item {
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr);
    column-gap: 10px;
    row-gap: 3px;
    align-items: baseline;
    padding: 13px 6px;
    box-shadow: inset 0 1px 0 var(--line-soft);
  }

  .pathrail__num {
    grid-column: 1;
    grid-row: 1 / 3;
    align-self: center;
    font-size: 12px;
  }

  .pathrail__label { grid-column: 2; grid-row: 1; font-size: 15.5px; }
  .pathrail__desc { display: block; grid-column: 2; grid-row: 2; }

  .pathrail__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-top: 12px;
    padding: 12px;
    background-color: transparent;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    color: var(--snow);
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.16em;
    cursor: pointer;
    transition: color 0.18s ease, border-color 0.18s ease;
  }

  .pathrail__close:hover { color: var(--brass); border-color: var(--brass); }

  .grid--2,
  .grid--3,
  .grid--split { grid-template-columns: 1fr; }

  .panel__tag { margin-left: 0; }
}

@media (max-width: 720px) {
  html { scroll-padding-top: 120px; }
  .topline__note { display: none; }
  .topline__meta { margin-left: auto; }
}

@media (max-width: 640px) {
  .masthead__inner { padding-block: 10px; gap: 10px; }
  .brand__sub { display: none; }
  .brand__mark { width: 36px; height: 36px; font-size: 17px; }
  .btn--sm { padding: 8px 12px; font-size: 12.5px; }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__col {
    padding-inline: 0;
    border-left: 0;
    border-top: 1px solid var(--line-soft);
    padding-top: 22px;
  }
  .footer__col--brand { border-top: 0; padding-top: 0; }
  .footer__legal { gap: 10px 18px; }
  .footer__copy { width: 100%; margin-right: 0; }
}

@media (max-width: 560px) {
  .topline__icp { display: none; }
}

@media (max-width: 400px) {
  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 9px 11px; }
}

/* ---------- 17. 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;
  }

  .status-dot { animation: none; }

  html[data-reveal="ready"] [data-lit]:not(.is-lit) {
    opacity: 1;
    transform: none;
  }
}