/* =========================================================
   葡萄京平台 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ========================================================= */

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

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

body { margin: 0; }

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

h1, h2, h3, h4, h5, p, figure, blockquote { margin: 0; }

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

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

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

[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --grape: #5B2C6F;
  --grape-deep: #3A1A46;
  --grape-grey: #6E5E7A;
  --mist: #EDE6F2;
  --ink: #1A1A1A;
  --graphite: #4F4F4F;
  --cinnabar: #C0392B;
  --rice: #F5F0E8;
  --moss: #5F7A63;
  --vine: #B9AEC4;
  --paper: #FFFFFF;

  --font-head: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;

  --header-h: 72px;
  --gutter: 28px;
  --radius: 10px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 380ms;
  --line-vine: rgba(185, 174, 196, 0.75);
  --shadow-card: 0 1px 0 rgba(26, 26, 26, 0.05), 0 14px 28px -24px rgba(58, 26, 70, 0.85);
  --shadow-lift: 0 18px 38px -26px rgba(58, 26, 70, 0.95);
}

/* ---------- 3. 中文排版与全局底 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--ink);
  background-color: var(--rice);
  background-image:
    linear-gradient(rgba(185, 174, 196, 0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(185, 174, 196, 0.18) 1px, transparent 1px);
  background-size: 36px 36px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(28px, 4vw, 40px); }
h2 { font-size: clamp(22px, 2.6vw, 28px); }
h3 { font-size: 20px; font-weight: 600; }

strong, b { font-weight: 700; }

:focus-visible {
  outline: 3px solid var(--cinnabar);
  outline-offset: 3px;
  border-radius: 3px;
}

.site-header :focus-visible { outline-color: var(--rice); }

#main-content { display: block; scroll-margin-top: calc(var(--header-h) + 16px); }

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 14px;
  top: -80px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--rice);
  color: var(--grape-deep);
  border: 1px solid var(--grape);
  border-radius: 6px;
  font-size: 15px;
  transition: top 220ms var(--ease);
}

.skip-link:focus { top: 14px; }

/* ---------- 5. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--grape);
  color: var(--rice);
  border-bottom: 1px solid rgba(245, 240, 232, 0.2);
  box-shadow: 0 6px 18px -16px rgba(58, 26, 70, 0.95);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: 1440px;
  min-height: var(--header-h);
  margin: 0 auto;
  padding: 10px var(--gutter);
}

.brand-sign {
  display: flex;
  flex-direction: column;
  gap: 1px;
  flex: 0 0 auto;
  padding: 4px 0;
}

.brand-name {
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1.25;
}

.brand-line {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: rgba(245, 240, 232, 0.72);
  line-height: 1.3;
}

.week-stamp {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 5px 14px;
  border: 1px dashed rgba(245, 240, 232, 0.42);
  border-radius: 999px;
}

.week-stamp-label {
  font-size: 14px;
  color: rgba(245, 240, 232, 0.78);
  letter-spacing: 0.06em;
}

.week-stamp-num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--rice);
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: block;
  isolation: isolate;
  padding: 10px 16px;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: rgba(245, 240, 232, 0.86);
  transition: color var(--dur) var(--ease);
}

.nav-link::before {
  content: "";
  position: absolute;
  inset: 3px 0;
  z-index: -1;
  background: rgba(245, 240, 232, 0.08);
  border: 1px solid rgba(245, 240, 232, 0.3);
  border-radius: 3px;
  transform: rotate(-12deg);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-link:hover { color: var(--rice); }
.nav-link:hover::before { background: rgba(245, 240, 232, 0.2); }

.nav-link[aria-current="page"] {
  color: var(--rice);
  font-weight: 700;
}

.nav-link[aria-current="page"]::before {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  box-shadow: 0 8px 16px -12px rgba(0, 0, 0, 0.85);
}

/* 头部工具区 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.index-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border: 1px solid rgba(245, 240, 232, 0.4);
  border-radius: 6px;
  color: var(--rice);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.index-toggle:hover { background: rgba(245, 240, 232, 0.14); }

.index-toggle[aria-expanded="true"] {
  background: var(--rice);
  color: var(--grape-deep);
  border-color: var(--rice);
}

.index-toggle-label {
  font-size: 14px;
  letter-spacing: 0.08em;
}

.version-num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border: 1px solid rgba(245, 240, 232, 0.4);
  border-radius: 6px;
  color: var(--rice);
}

.nav-toggle-bar {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--rice);
}

.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--rice);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle-bar::before { top: -6px; }
.nav-toggle-bar::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after { transform: translateY(-6px) rotate(-45deg); }

.nav-toggle-text { font-size: 14px; letter-spacing: 0.08em; }

/* 索引分类面板 */
.index-panel {
  position: absolute;
  right: var(--gutter);
  top: calc(100% + 8px);
  z-index: 70;
  width: min(440px, calc(100vw - 40px));
  padding: 20px;
  background: var(--rice);
  color: var(--ink);
  border: 1px solid var(--vine);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lift);
}

.index-panel-title {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--grape);
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line-vine);
}

.index-panel-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 14px;
}

.index-chip {
  display: inline-block;
  padding: 6px 14px;
  font-size: 15px;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--grape-deep);
  background: var(--mist);
  border: 1px solid var(--vine);
  border-radius: 999px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.index-chip:hover {
  background: var(--grape);
  color: var(--rice);
  border-color: var(--grape-deep);
}

.index-panel-note {
  font-size: 14px;
  color: var(--graphite);
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(245, 240, 232, 0.14);
  overflow: hidden;
}

.scroll-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--cinnabar);
  transition: width 120ms linear;
}

/* 印章式联系入口 */
.stamp-entry {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 80;
}

.stamp-button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: 86px;
  height: 86px;
  border-radius: 14px;
  background: var(--grape-deep);
  border: 2px solid var(--cinnabar);
  color: var(--rice);
  box-shadow: 0 16px 32px -20px rgba(26, 26, 26, 0.95);
  transform: rotate(-8deg);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.stamp-button:hover,
.stamp-button:focus-visible {
  transform: rotate(-3deg) scale(1.05);
  box-shadow: 0 22px 40px -22px rgba(26, 26, 26, 1);
}

.stamp-seal {
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--rice);
}

.stamp-text {
  font-size: 14px;
  letter-spacing: 0.1em;
  color: rgba(245, 240, 232, 0.8);
}

.stamp-panel {
  position: absolute;
  right: 0;
  bottom: calc(100% + 14px);
  width: 300px;
  padding: 18px;
  background: var(--rice);
  color: var(--ink);
  border: 1px solid var(--vine);
  border-left: 4px solid var(--cinnabar);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lift);
}

.stamp-panel-title {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--grape);
}

.stamp-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  font-size: 14px;
  color: var(--graphite);
}

.stamp-line .mono {
  font-size: 14px;
  color: var(--ink);
  word-break: break-all;
}

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

.copy-btn {
  padding: 3px 10px;
  font-size: 14px;
  color: var(--grape-deep);
  background: var(--mist);
  border: 1px solid var(--vine);
  border-radius: 4px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.copy-btn:hover {
  background: var(--grape);
  color: var(--rice);
  border-color: var(--grape-deep);
}

.stamp-cta {
  display: inline-block;
  margin-top: 14px;
  padding: 9px 18px;
  font-size: 15px;
  color: var(--rice);
  background: var(--grape);
  border: 1px solid var(--grape-deep);
  border-radius: 6px;
  transition: background var(--dur) var(--ease);
}

.stamp-cta:hover { background: var(--grape-deep); }

/* ---------- 6. 页脚 ---------- */
.site-footer {
  margin-top: 88px;
  background: var(--grape-deep);
  color: var(--rice);
  border-top: 6px solid var(--grape);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 36px;
  max-width: 1440px;
  margin: 0 auto;
  padding: 56px var(--gutter) 36px;
}

.footer-brand-name {
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.footer-brand-line {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: rgba(245, 240, 232, 0.7);
}

.footer-closing {
  margin-top: 16px;
  padding-top: 14px;
  max-width: 32ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 240, 232, 0.72);
  border-top: 1px dashed rgba(245, 240, 232, 0.24);
}

.footer-col { display: flex; flex-direction: column; gap: 14px; }

.footer-title {
  position: relative;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: rgba(245, 240, 232, 0.62);
  padding-bottom: 12px;
}

.footer-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 3px;
  background: var(--cinnabar);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  font-size: 15px;
}

.footer-list a {
  color: rgba(245, 240, 232, 0.86);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-list a:hover {
  color: var(--rice);
  border-bottom-color: var(--vine);
}

.footer-list-plain { color: rgba(245, 240, 232, 0.74); }
.footer-list-plain .mono { font-size: 14px; color: rgba(245, 240, 232, 0.86); }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 1440px;
  margin: 0 auto;
  padding: 18px var(--gutter) 26px;
  border-top: 1px solid rgba(245, 240, 232, 0.18);
}

.footer-copy,
.footer-meta {
  font-size: 14px;
  color: rgba(245, 240, 232, 0.66);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* ---------- 7. 通用布局组件 ---------- */
.container {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: 64px 0; }
.section--tight { padding: 36px 0; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 28px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-vine);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--grape);
}

.section-title {
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.35;
}

.section-note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--graphite);
}

.panel-mist { background: var(--mist); }

.panel-grape {
  background: var(--grape);
  color: var(--rice);
}

.panel-grape .section-title { color: var(--rice); }
.panel-grape .section-head { border-bottom-color: rgba(245, 240, 232, 0.26); }
.panel-grape .eyebrow { color: rgba(245, 240, 232, 0.75); }
.panel-grape .section-note { color: rgba(245, 240, 232, 0.72); }

/* 左右分屏 */
.split-layout {
  display: grid;
  grid-template-columns: 4fr 8fr;
  gap: 32px;
  align-items: start;
}

.split-layout--5-7 { grid-template-columns: 5fr 7fr; }
.split-layout--3-9 { grid-template-columns: 3fr 9fr; }

.split-aside {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  align-self: start;
}

.split-main { min-width: 0; }

/* ---------- 8. 卡片与索引元素 ---------- */
.card {
  position: relative;
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--vine);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.card::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px dashed rgba(185, 174, 196, 0.6);
  border-radius: 6px;
  pointer-events: none;
}

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

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--grape-grey);
  margin-bottom: 10px;
}

.card-title {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.45;
}

.card-note {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

.index-number {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--grape);
  letter-spacing: 0.02em;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.tag {
  display: inline-block;
  padding: 3px 11px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--grape-deep);
  background: var(--mist);
  border: 1px solid var(--vine);
  border-radius: 999px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.tag:hover {
  background: var(--grape);
  color: var(--rice);
}

.tag--state {
  background: rgba(192, 57, 43, 0.1);
  border-color: var(--cinnabar);
  color: var(--cinnabar);
  font-weight: 700;
}

.tag--ok {
  background: rgba(95, 122, 99, 0.14);
  border-color: var(--moss);
  color: var(--moss);
  font-weight: 700;
}

/* 数字指标 */
.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
}

.stat { min-width: 120px; }

.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--grape);
}

.stat-label {
  display: block;
  margin-top: 4px;
  font-size: 14px;
  color: var(--graphite);
}

.panel-grape .stat-num { color: var(--rice); }
.panel-grape .stat-label { color: rgba(245, 240, 232, 0.72); }

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  border-radius: 6px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.btn--primary {
  background: var(--grape);
  color: var(--rice);
  border-color: var(--grape-deep);
}

.btn--primary:hover { background: var(--grape-deep); }

.btn--ghost {
  background: transparent;
  color: var(--grape-deep);
  border-color: var(--grape-grey);
}

.btn--ghost:hover {
  background: var(--mist);
  border-color: var(--grape);
}

.link-more {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--grape);
  border-bottom: 1px solid var(--vine);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.link-more:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb { padding: 22px 0 0; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--graphite);
}

.breadcrumb-item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--vine);
}

.breadcrumb-link {
  color: var(--grape);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.breadcrumb-link:hover { border-bottom-color: var(--grape); }

/* ---------- 11. 正文排版 ---------- */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
}

.prose > * + * { margin-top: 1em; }

.prose h2 {
  font-size: 28px;
  margin-top: 1.6em;
}

.prose h3 {
  font-size: 20px;
  font-weight: 600;
  margin-top: 1.4em;
}

.prose ul,
.prose ol { margin-top: 1em; }

.prose ul li {
  position: relative;
  padding-left: 22px;
  margin-top: 0.5em;
}

.prose ul li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--vine);
}

.prose ol { counter-reset: prose-step; }

.prose ol li {
  position: relative;
  padding-left: 34px;
  margin-top: 0.6em;
  counter-increment: prose-step;
}

.prose ol li::before {
  content: counter(prose-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--grape);
}

.prose a {
  color: var(--grape);
  border-bottom: 1px solid var(--vine);
}

/* ---------- 12. 分隔与图片容器 ---------- */
.divider-vine {
  height: 0;
  margin: 36px 0;
  border: 0;
  border-top: 1px dashed var(--line-vine);
}

.figure { display: block; margin: 0; }

.figure-media {
  position: relative;
  overflow: hidden;
  width: 100%;
  border: 1px solid var(--vine);
  border-radius: var(--radius);
  background:
    linear-gradient(160deg, var(--mist) 0%, #ded4e6 55%, #cfc3da 100%);
}

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

.figure-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.ratio-16x9 { aspect-ratio: 16 / 9; }
.ratio-4x3 { aspect-ratio: 4 / 3; }
.ratio-1x1 { aspect-ratio: 1 / 1; }

/* ---------- 13. 工具类 ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.stack > * + * { margin-top: 20px; }

/* 滚动显现 */
.js-motion [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
  will-change: opacity, transform;
}

.js-motion [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 媒体查询 ---------- */
@media (max-width: 1180px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 1080px) {
  .split-layout,
  .split-layout--5-7,
  .split-layout--3-9 { grid-template-columns: 1fr; gap: 28px; }

  .split-aside { position: static; }
}

@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-left: 0;
    padding: 16px var(--gutter) 22px;
    background: var(--grape-deep);
    border-top: 1px solid rgba(245, 240, 232, 0.18);
    box-shadow: 0 26px 44px -30px rgba(0, 0, 0, 0.95);
  }

  .site-nav[data-open="true"] { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .nav-link { padding: 13px 18px; }
  .nav-link::before { inset: 0; }

  .index-panel { left: var(--gutter); right: var(--gutter); width: auto; }
}

@media (max-width: 760px) {
  :root { --gutter: 16px; }

  .week-stamp { display: none; }

  .brand-name { font-size: 19px; }
  .brand-line { font-size: 14px; }

  .version-num { font-size: 16px; }

  .section { padding: 44px 0; }
  .section--tight { padding: 28px 0; }
  .section-note { margin-left: 0; }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px var(--gutter) 28px;
  }

  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px var(--gutter) 24px;
  }

  .stamp-entry {
    right: 14px;
    bottom: 14px;
  }

  .stamp-button {
    width: 72px;
    height: 72px;
    border-radius: 12px;
  }

  .stamp-seal { font-size: 20px; }

  .stamp-panel {
    position: fixed;
    left: 12px;
    right: 12px;
    bottom: 104px;
    width: auto;
  }
}

@media (max-width: 460px) {
  body { font-size: 16px; }

  .index-toggle-label { display: none; }

  .stat-row { gap: 18px; }
  .stat { min-width: 96px; }
}

/* ---------- 15. 动效与无障碍偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .js-motion [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .card:hover { transform: none; }
  .stamp-button:hover,
  .stamp-button:focus-visible { transform: rotate(-8deg); }
}