/* ============================================================
   旺财主站 · 共享样式表 /assets/site.css
   ============================================================ */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption,
blockquote, dl, dd, fieldset, legend {
  margin: 0;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; width: 100%; }

[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --wool: #F6F1E7;
  --wool-2: #FBF8F1;
  --walnut: #4A2E1C;
  --copper: #B87A3C;
  --copper-soft: #E7C89C;
  --stone: #7A7367;
  --moss: #5E6B48;
  --peacock: #14555E;
  --pomegranate: #9E2233;
  --terracotta: #C8784F;
  --ink: #1E1410;

  --line: rgba(122, 115, 103, 0.36);
  --line-soft: rgba(122, 115, 103, 0.18);
  --paper-line: rgba(122, 115, 103, 0.10);

  --shadow-s: 0 1px 2px rgba(30, 20, 16, 0.05), 0 10px 24px -18px rgba(30, 20, 16, 0.32);
  --shadow-m: 0 2px 4px rgba(30, 20, 16, 0.06), 0 22px 44px -28px rgba(30, 20, 16, 0.38);

  --radius: 6px;
  --radius-lg: 12px;

  --font-display: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", "Cascadia Mono", Menlo, Consolas, "DejaVu Sans Mono", monospace;

  --shell: 1280px;
  --gutter: clamp(20px, 4vw, 48px);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--wool);
  background-image:
    radial-gradient(120% 80% at 8% -10%, rgba(231, 200, 156, 0.42), transparent 58%),
    radial-gradient(90% 70% at 100% 0%, rgba(200, 120, 79, 0.10), transparent 60%);
  background-repeat: no-repeat;
  color: var(--walnut);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.012em;
  color: var(--walnut);
  text-wrap: balance;
}

p { text-wrap: pretty; }

strong, b { font-weight: 700; }

::selection {
  background: var(--copper-soft);
  color: var(--walnut);
}

/* ---------- 4. 无障碍与工具 ---------- */
:focus-visible {
  outline: 2px solid var(--peacock);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -120px;
  z-index: 300;
  display: inline-block;
  padding: 11px 20px;
  background: var(--ink);
  color: var(--wool);
  font-size: 14px;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top 0.18s var(--ease);
}
.skip-link:focus { top: 0; }

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.shell--narrow { max-width: 900px; }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}

.g-main { grid-column: 1 / 8; }
.g-aside { grid-column: 9 / 13; }

.stack { display: block; }
.stack > * + * { margin-top: var(--stack-gap, 28px); }

/* ---------- 5. 文字层级 ---------- */
.d1 { font-size: clamp(34px, 4.6vw, 58px); line-height: 1.12; }
.d2 { font-size: clamp(26px, 3vw, 38px); line-height: 1.18; }
.d3 { font-size: clamp(20px, 2vw, 26px); line-height: 1.28; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
  flex: none;
}

.lede {
  font-size: clamp(16.5px, 1.4vw, 18.5px);
  line-height: 1.72;
  color: #43301f;
  max-width: 62ch;
}

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

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: 0.01em;
}

.stat { display: flex; flex-direction: column; gap: 5px; }

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 3.4vw, 44px);
  font-weight: 600;
  line-height: 1.04;
  color: var(--copper);
}

.stat__label {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

/* ---------- 6. 按钮 / 标签 / 筛选 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.25;
  white-space: nowrap;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn:hover { transform: translateY(-1px); }

.btn--copper { background: var(--copper); color: #FFFDF9; }
.btn--copper:hover { background: var(--walnut); }

.btn--ghost { border-color: var(--line); color: var(--walnut); background: transparent; }
.btn--ghost:hover { border-color: var(--copper); color: var(--copper); }

.btn--ink { background: var(--walnut); color: var(--wool); }
.btn--ink:hover { background: var(--ink); }

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--stone);
  background: transparent;
}
.tag--moss { background: var(--moss); border-color: var(--moss); color: var(--wool); }
.tag--peacock { background: var(--peacock); border-color: var(--peacock); color: var(--wool); }
.tag--pomegranate { background: var(--pomegranate); border-color: var(--pomegranate); color: var(--wool); }
.tag--copper { background: rgba(231, 200, 156, 0.34); border-color: rgba(184, 122, 60, 0.5); color: var(--copper); }

.chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--walnut);
  background: transparent;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.chip:hover { border-color: var(--peacock); color: var(--peacock); }
.chip[aria-pressed="true"],
.chip[data-active] {
  background: var(--peacock);
  border-color: var(--peacock);
  color: var(--wool);
}

/* ---------- 7. 面板 / 卡片 / 主题带 ---------- */
.panel {
  position: relative;
  background: var(--wool-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-s);
  padding: clamp(22px, 3vw, 40px);
}

.panel--flat {
  background: transparent;
  border-color: var(--line);
  box-shadow: none;
}

.panel--ink {
  background: var(--ink);
  border-color: transparent;
  color: rgba(246, 241, 231, 0.84);
  box-shadow: var(--shadow-m);
}
.panel--ink h1, .panel--ink h2, .panel--ink h3, .panel--ink h4 { color: var(--wool); }
.panel--ink .lede { color: rgba(246, 241, 231, 0.78); }
.panel--ink .eyebrow { color: var(--copper-soft); }
.panel--ink .annotation { color: rgba(246, 241, 231, 0.55); }
.panel--ink .stat__value { color: var(--copper-soft); }
.panel--ink .stat__label { color: rgba(246, 241, 231, 0.55); }

.panel--moss {
  background: var(--moss);
  border-color: transparent;
  color: rgba(246, 241, 231, 0.9);
}
.panel--moss h1, .panel--moss h2, .panel--moss h3 { color: var(--wool); }
.panel--moss .eyebrow { color: var(--copper-soft); }

.card {
  position: relative;
  background: var(--wool-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-s);
  padding: clamp(18px, 2vw, 26px);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}
.card:hover {
  border-color: rgba(184, 122, 60, 0.55);
  transform: translateY(-2px);
}
.card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.35;
  color: var(--walnut);
}
.card__meta {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background-image: linear-gradient(180deg, rgba(231, 200, 156, 0.42), rgba(231, 200, 156, 0.12));
  padding-block: clamp(26px, 4vw, 52px);
}

.band__track {
  display: flex;
  align-items: stretch;
  gap: clamp(16px, 2.4vw, 36px);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  padding-block: 4px;
  scrollbar-width: thin;
  scrollbar-color: var(--copper-soft) transparent;
}
.band__track::-webkit-scrollbar { height: 6px; }
.band__track::-webkit-scrollbar-thumb { background: var(--copper-soft); border-radius: 999px; }
.band__track > * { flex: 0 0 auto; scroll-snap-align: start; }

/* ---------- 8. 图片容器 ---------- */
.figure { display: block; margin: 0; }

.figure__frame {
  position: relative;
  display: block;
  padding: 6px;
  background-image: linear-gradient(140deg, #EFE6D6 0%, #FBF6EC 55%, #E9DCC6 100%);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-s);
  overflow: hidden;
}
.figure__frame > img,
.figure__frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 2px;
  filter: saturate(0.96) contrast(1.03) sepia(0.04);
}
.figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(120% 90% at 14% 0%, rgba(200, 120, 79, 0.12), transparent 62%);
}

.figure--16x9 .figure__frame { aspect-ratio: 16 / 9; }
.figure--4x3 .figure__frame { aspect-ratio: 4 / 3; }
.figure--1x1 .figure__frame { aspect-ratio: 1 / 1; }
.figure--3x4 .figure__frame { aspect-ratio: 3 / 4; }
.figure--wide .figure__frame { aspect-ratio: 21 / 9; }

.figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--stone);
}

/* ---------- 9. 正文块 ---------- */
.prose { max-width: 64ch; }
.prose > * + * { margin-top: 1.1em; }
.prose p { font-size: 16.5px; color: #3B2A1D; }
.prose h2 { margin-top: 2em; font-size: clamp(22px, 2.4vw, 30px); }
.prose h3 { margin-top: 1.6em; font-size: 19px; }
.prose ul, .prose ol { list-style: disc; padding-left: 1.25em; }
.prose ol { list-style: decimal; }
.prose li { margin-top: 0.5em; font-size: 16px; color: #3B2A1D; }
.prose a {
  color: var(--peacock);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.prose a:hover { color: var(--pomegranate); }
.prose blockquote {
  border-left: 2px solid var(--copper);
  padding: 4px 0 4px 18px;
  color: var(--stone);
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: rgba(231, 200, 156, 0.4);
  padding: 2px 6px;
  border-radius: 3px;
}

/* ---------- 10. 面包屑 ---------- */
.crumbs {
  padding-block: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}
.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.crumbs li { display: inline-flex; align-items: center; }
.crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.crumbs a { color: var(--stone); }
.crumbs a:hover { color: var(--copper); }

/* ---------- 11. 标签页 ---------- */
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.tabs__tab {
  padding: 9px 17px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 14.5px;
  color: var(--stone);
  background: transparent;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.tabs__tab:hover { border-color: var(--copper); color: var(--copper); }
.tabs__tab[aria-selected="true"] {
  background: var(--walnut);
  border-color: var(--walnut);
  color: var(--wool);
}

.tabs__panel {
  padding-top: 26px;
  animation: tab-in 0.26s var(--ease) both;
}

@keyframes tab-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 12. 手风琴 ---------- */
.acc__item { border-bottom: 1px solid var(--line-soft); }
.acc__item:first-child { border-top: 1px solid var(--line-soft); }

.acc__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 18px 2px;
  text-align: left;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--walnut);
}
.acc__trigger:hover { color: var(--copper); }

.acc__icon {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
}
.acc__icon::before,
.acc__icon::after {
  content: "";
  position: absolute;
  background: var(--copper);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}
.acc__icon::before { left: 0; right: 0; top: 7px; height: 1.5px; }
.acc__icon::after { top: 0; bottom: 0; left: 7px; width: 1.5px; }
.acc__item[data-open] .acc__icon::after { transform: scaleY(0); opacity: 0; }

.acc__panel {
  padding: 0 2px 20px;
  font-size: 15.5px;
  line-height: 1.72;
  color: #4A382A;
  max-width: 64ch;
}

/* ---------- 13. 侧栏章节索引 ---------- */
.sec-index {
  position: sticky;
  top: 110px;
  font-size: 13px;
}
.sec-index__link {
  display: block;
  padding: 7px 0 7px 14px;
  border-left: 1px solid var(--line);
  color: var(--stone);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.sec-index__link:hover { color: var(--copper); }
.sec-index__link[aria-current="true"] {
  border-left-color: var(--copper);
  color: var(--walnut);
  font-weight: 600;
}

/* ---------- 14. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--wool);
  border-bottom: 1px solid var(--line);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--copper) 0%, var(--terracotta) 46%, var(--pomegranate) 100%);
}

.masthead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(16px, 2.4vw, 40px);
  padding-block: 20px 15px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 3px;
  justify-self: start;
  min-width: 0;
}

.brand__mark {
  position: relative;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.2vw, 28px);
  letter-spacing: 0.07em;
  line-height: 1.1;
  color: var(--walnut);
  padding-bottom: 5px;
}
.brand__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--copper) 0%, rgba(184, 122, 60, 0.06) 100%);
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--stone);
  white-space: nowrap;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.7vw, 26px);
}

.primary-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: 15px;
  color: var(--walnut);
  white-space: nowrap;
  transition: color 0.18s var(--ease);
}
.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 3px;
  height: 1px;
  background: var(--copper);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--ease);
}
.primary-nav__link:hover { color: var(--copper); }
.primary-nav__link:hover::after { transform: scaleX(1); }

.primary-nav__link[aria-current="page"] {
  color: var(--copper);
  font-weight: 600;
}
.primary-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.masthead__utility {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-self: end;
}

.util-chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 15px;
  border: 1px solid rgba(184, 122, 60, 0.5);
  border-radius: 999px;
  background: var(--copper-soft);
  color: var(--walnut);
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}
.util-chip:hover { background: var(--copper); color: #FFFDF9; }

.util-call {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--peacock);
  white-space: nowrap;
  transition: color 0.18s var(--ease);
}
.util-call::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pomegranate);
  box-shadow: 0 0 0 3px rgba(158, 34, 51, 0.16);
}
.util-call:hover { color: var(--pomegranate); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--walnut);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.nav-toggle:hover { border-color: var(--copper); color: var(--copper); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}
.nav-toggle__bars i {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0;
  background: var(--copper);
  transition: width 0.08s linear;
}

@keyframes navdrop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 15. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 140px);
  background: var(--ink);
  border-top: 3px solid var(--copper);
  color: rgba(246, 241, 231, 0.8);
}

.footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.5fr);
  gap: clamp(32px, 5vw, 76px);
  padding-block: clamp(44px, 6vw, 84px) 28px;
}

.footer__mark {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 30px;
  letter-spacing: 0.09em;
  line-height: 1.1;
  color: var(--wool);
}
.footer__mark:hover { color: var(--copper-soft); }

.footer__line {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--copper-soft);
}

.footer__contact {
  margin-top: 24px;
  display: grid;
  gap: 11px;
}
.footer__contact li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.6;
}
.footer__label {
  flex: none;
  min-width: 68px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(246, 241, 231, 0.42);
}
.footer__value {
  color: var(--wool);
  word-break: break-word;
}

.footer__note {
  margin-top: 20px;
  max-width: 44ch;
  padding-left: 13px;
  border-left: 2px solid rgba(184, 122, 60, 0.55);
  font-size: 13px;
  line-height: 1.72;
  color: rgba(246, 241, 231, 0.52);
}

.footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 44px);
}

.footer__group-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--copper-soft);
}

.footer__link {
  display: inline-block;
  padding: 6px 0;
  font-size: 14.5px;
  color: rgba(246, 241, 231, 0.78);
  transition: color 0.18s var(--ease), transform 0.18s var(--ease);
}
.footer__link:hover {
  color: var(--copper-soft);
  transform: translateX(3px);
}

.footer__meta {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 28px;
  margin-top: 10px;
  padding-top: 18px;
  border-top: 1px solid rgba(246, 241, 231, 0.14);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: rgba(246, 241, 231, 0.5);
}

/* ---------- 16. 显现动画 ---------- */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.42s var(--ease), transform 0.42s var(--ease);
}
.js-reveal [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1100px) {
  .primary-nav__list { gap: 14px; }
  .primary-nav__link { font-size: 14.5px; }
}

@media (max-width: 980px) {
  .masthead {
    grid-template-columns: minmax(0, 1fr) auto;
    padding-block: 16px 13px;
  }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: min(72vh, 520px);
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--wool);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 20px 34px -26px rgba(30, 20, 16, 0.5);
  }
  .primary-nav[data-open] {
    display: block;
    animation: navdrop 0.22s var(--ease) both;
  }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px var(--gutter) 16px;
  }

  .primary-nav__link {
    display: block;
    padding: 13px 2px;
    font-size: 16.5px;
    border-bottom: 1px solid var(--line-soft);
  }
  .primary-nav__link::after { display: none; }

  .primary-nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: -2px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 17px;
    border-radius: 2px;
    background: var(--copper);
  }
  .primary-nav__link[aria-current="page"] { padding-left: 13px; }

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

  .grid { grid-template-columns: minmax(0, 1fr); }
  .g-main, .g-aside { grid-column: 1 / -1; }

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

  .sec-index { position: static; }
}

@media (max-width: 760px) {
  .util-call { display: none; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .nav-toggle__text { display: none; }
  .util-chip { padding: 8px 12px; font-size: 13px; }

  .footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__meta { flex-direction: column; align-items: flex-start; }
  .footer__label { min-width: 100%; }
}

@media (max-width: 420px) {
  .brand__tagline { font-size: 10.5px; letter-spacing: 0.08em; }
  .footer__nav { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 18. 降低动效 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .js-reveal [data-reveal],
  .js-reveal [data-reveal].is-in {
    opacity: 1 !important;
    transform: none !important;
  }

  .card:hover, .btn:hover, .footer__link:hover { transform: none; }
}