/* ==========================================================================
   6米乐赛场 — 共享样式 /assets/site.css
   蓝图网格 × 高原经幡五色
   ========================================================================== */

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

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

body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }

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

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

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

:focus-visible {
  outline: 2px solid #FF7A1A;
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 2. tokens ---------- */
:root {
  --ink: #0A1A2B;
  --ink-deep: #07121C;
  --panel: #102A42;
  --panel-soft: #0D2338;
  --line: #17395A;
  --grid: rgba(23, 57, 90, 0.45);
  --orange: #FF7A1A;
  --gold: #FFB84D;
  --green: #46D39A;
  --green-deep: #1F8F6B;
  --saffron: #C8323C;
  --maroon: #7A2230;
  --violet: #6B5BA8;
  --snow: #EAF1F8;
  --mist: #9FB3C8;

  --cut: 16px;
  --radius: 2px;
  --maxw: 1280px;
  --gutter: clamp(16px, 4vw, 40px);

  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --dur-fast: 120ms;
  --dur: 180ms;
  --dur-slow: 360ms;
}

/* ---------- 3. 中文正文与蓝图底 ---------- */
body {
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--snow);
  background-color: var(--ink);
  background-image:
    radial-gradient(900px 420px at 10% -6%, rgba(255, 122, 26, 0.10), transparent 70%),
    radial-gradient(760px 380px at 94% 2%, rgba(70, 211, 154, 0.08), transparent 72%),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-repeat: no-repeat, no-repeat, repeat, repeat;
  background-size: auto, auto, 72px 72px, 72px 72px;
  background-position: center top, center top, center top, center top;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

p { max-width: 40em; }

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

::selection {
  background: var(--orange);
  color: #08151F;
}

/* ---------- 4. 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: clamp(40px, 6vw, 88px);
}

.section-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(20px, 3vw, 40px);
}

.stack { display: grid; gap: clamp(12px, 1.6vw, 20px); }
.stack-lg { display: grid; gap: clamp(20px, 3vw, 40px); }

.flow > * + * { margin-top: var(--flow, 1.1em); }

.grid { display: grid; gap: clamp(16px, 2.2vw, 28px); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.split-7-5 { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.split-8-4 { grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); }
.split-5-7 { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }

/* ---------- 5. 排版组件 ---------- */
.display {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.2rem);
  font-weight: 800;
  line-height: 1.25;
}

.h3 {
  font-size: clamp(1.15rem, 1.6vw, 1.4rem);
  font-weight: 700;
}

.lead {
  font-size: clamp(1rem, 1.15vw, 1.125rem);
  color: var(--mist);
  line-height: 1.8;
  max-width: 38em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--green);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--green);
  flex: 0 0 auto;
}

.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  font-size: 0.85em;
}

.muted { color: var(--mist); }

.index-tag {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.section-index {
  display: inline-grid;
  place-items: center;
  min-width: 36px;
  height: 26px;
  padding: 0 8px;
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

/* ---------- 6. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: 0;
  z-index: 200;
  transform: translateY(-150%);
  background: var(--orange);
  color: #08151F;
  font-size: 14px;
  font-weight: 700;
  padding: 10px 18px;
  transition: transform var(--dur) ease;
}

.skip-link:focus {
  transform: translateY(0);
  outline-color: #08151F;
}

/* ---------- 7. 阅读进度轴 ---------- */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(23, 57, 90, 0.75);
  z-index: 120;
  pointer-events: none;
}

.read-progress-fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--green) 0%, var(--orange) 62%, var(--saffron) 100%);
  transition: width 120ms linear;
}

/* ---------- 8. 页头 ---------- */
.site-header {
  position: relative;
  z-index: 90;
}

.header-rail {
  position: relative;
  background: linear-gradient(180deg, #07131E 0%, #0A1A2B 100%);
  border-bottom: 1px solid var(--line);
}

.header-rail::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: min(38%, 420px);
  height: 2px;
  background: linear-gradient(90deg, var(--saffron), var(--orange) 55%, transparent);
}

.header-rail-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px clamp(16px, 3vw, 40px);
  min-height: 66px;
  padding-block: 12px;
}

/* 品牌组合 */
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-glyph {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--saffron), var(--orange));
  color: #08151F;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.brand-name {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--snow);
  transition: color var(--dur) ease;
}

.brand-sub {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.brand-mark:hover .brand-name { color: var(--orange); }
.brand-mark:hover .brand-glyph { background: linear-gradient(135deg, var(--orange), var(--gold)); }

/* 上层工具信息 */
.header-utility {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px clamp(12px, 2vw, 26px);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

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

.utility-key {
  border: 1px solid rgba(70, 211, 154, 0.35);
  color: var(--green);
  padding: 1px 6px;
  font-size: 10.5px;
  letter-spacing: 0.12em;
  font-family: var(--mono);
}

/* 下层吸顶导航 */
.header-navbar {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(10, 26, 43, 0.94);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: box-shadow var(--dur) ease, border-color var(--dur) ease;
}

.header-navbar[data-scrolled="true"] {
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.48);
  border-bottom-color: rgba(255, 122, 26, 0.38);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 58px;
}

.primary-nav { display: flex; align-items: center; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  counter-reset: nav;
}

.nav-item { counter-increment: nav; }

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 16px 14px;
  font-size: 15px;
  color: var(--mist);
  white-space: nowrap;
  transition: color var(--dur) ease, background-color var(--dur) ease;
}

.nav-link::before {
  content: "0" counter(nav);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(159, 179, 200, 0.6);
  transition: color var(--dur) ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 0;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) ease;
}

.nav-link:hover {
  color: var(--snow);
  background: rgba(23, 57, 90, 0.5);
}

.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--snow);
  background: linear-gradient(180deg, rgba(255, 122, 26, 0.16), transparent);
}

.nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"]::before { color: var(--orange); }

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  white-space: nowrap;
  transition: background-color var(--dur-fast) ease, color var(--dur-fast) ease,
              transform var(--dur-fast) ease, border-color var(--dur-fast) ease,
              box-shadow var(--dur-fast) ease;
}

.btn:active { transform: translateY(1px); }

.btn-entry {
  background: var(--saffron);
  color: #FFFFFF;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.btn-entry:hover {
  background: var(--orange);
  color: #08151F;
}

.btn-primary {
  background: var(--orange);
  color: #08151F;
}

.btn-primary:hover {
  background: var(--gold);
  box-shadow: 0 8px 20px rgba(255, 122, 26, 0.28);
}

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

.btn-ghost:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.btn-block { width: 100%; }

/* ---------- 10. 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--snow);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  transition: border-color var(--dur) ease, color var(--dur) ease;
}

.nav-toggle-box {
  display: grid;
  gap: 4px;
  width: 18px;
  flex: 0 0 auto;
}

.nav-toggle-box span {
  display: block;
  height: 2px;
  background: var(--snow);
  transition: transform var(--dur) ease, opacity var(--dur) ease, background-color var(--dur) ease;
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-box span { background: var(--orange); }
.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 11. 面包屑 ---------- */
.breadcrumbs { padding-top: 18px; }

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.breadcrumbs li { display: inline-flex; align-items: center; gap: 8px; }

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

.breadcrumbs a { transition: color var(--dur) ease; }
.breadcrumbs a:hover { color: var(--orange); }
.breadcrumbs [aria-current="page"] { color: var(--snow); }

/* ---------- 12. 面板 / 数据 / 标签 ---------- */
.panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(18px, 2.4vw, 28px);
}

.cut-panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(18px, 2.4vw, 28px);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.cut-panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 44px;
  background: var(--orange);
}

.panel-quiet {
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-left: 3px solid var(--green-deep);
}

.stat { display: grid; gap: 4px; }

.stat-value {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--snow);
}

.stat-value.is-up { color: var(--orange); }
.stat-value.is-hold { color: var(--green); }

.stat-label {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.tag-orange { border-color: rgba(255, 122, 26, 0.55); color: var(--gold); }
.tag-green { border-color: rgba(70, 211, 154, 0.5); color: var(--green); }
.tag-violet { border-color: rgba(107, 91, 168, 0.65); color: #B7ACE0; }
.tag-saffron { border-color: rgba(200, 50, 60, 0.65); color: #EF8A91; }

/* ---------- 13. 图像容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  width: 100%;
  background: linear-gradient(150deg, #0E2A44 0%, #0A1A2B 55%, #132B3F 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(23, 57, 90, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 57, 90, 0.5) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.6;
  pointer-events: none;
}

.media-frame > img,
.media-frame > picture,
.media-frame > picture > img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--badge {
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  max-width: 120px;
}

.media-frame-tag {
  position: absolute;
  left: 10px;
  bottom: 10px;
  z-index: 2;
  padding: 3px 8px;
  background: rgba(7, 18, 28, 0.82);
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--green);
}

/* ---------- 14. 章节高亮与渐显 ---------- */
[data-section] {
  position: relative;
  transition: background-color var(--dur-slow) ease;
}

[data-section]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
  transition: background-color var(--dur-slow) ease;
}

[data-section].is-active::before { background: var(--orange); }
[data-section].is-active .eyebrow { color: var(--orange); }
[data-section].is-active .eyebrow::before { background: var(--orange); }
[data-section].is-active .section-index {
  color: var(--orange);
  border-color: rgba(255, 122, 26, 0.5);
}

.js .reveal {
  opacity: 0;
  transform: translate3d(-12px, 12px, 0);
  transition: opacity var(--dur-slow) ease, transform var(--dur-slow) ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 15. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: linear-gradient(180deg, #0A1A2B 0%, #081521 100%);
  border-top: 1px solid var(--line);
}

.footer-band {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 44px;
  padding-inline: var(--gutter);
  background: linear-gradient(90deg, var(--maroon) 0%, #5A1824 48%, rgba(122, 34, 48, 0.18) 100%);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 66%, 0 100%);
}

.footer-band-text {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: rgba(234, 241, 248, 0.7);
  white-space: nowrap;
}

.footer-band-rule {
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 122, 26, 0.6), transparent);
}

.footer-main { padding-block: clamp(30px, 5vw, 62px); }

.footer-main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.6fr);
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.footer-brand .brand-mark { margin-bottom: 18px; }

.footer-summary {
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 44ch;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 18px;
}

.footer-meta-item {
  border: 1px solid rgba(70, 211, 154, 0.3);
  color: var(--green);
  padding: 3px 9px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 32px);
}

.footer-col-title {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--mist);
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.footer-links { display: grid; gap: 10px; }

.footer-link {
  position: relative;
  display: inline-block;
  padding-left: 14px;
  font-size: 15px;
  color: var(--snow);
  transition: color var(--dur) ease, transform var(--dur) ease;
}

.footer-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--line);
  transition: width var(--dur) ease, background-color var(--dur) ease;
}

.footer-link:hover { color: var(--orange); }
.footer-link:hover::before { width: 9px; background: var(--orange); }

.footer-contact {
  border-top: 1px dashed var(--line);
  border-bottom: 1px solid var(--line);
  padding-block: 18px;
}

.footer-contact-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--snow);
}

.contact-item {
  display: flex;
  align-items: baseline;
  gap: 9px;
  max-width: none;
}

.contact-key {
  color: var(--mist);
  letter-spacing: 0.12em;
}

.contact-value { color: var(--snow); }

.footer-bottom {
  background: var(--ink-deep);
  border-top: 1px solid var(--line);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  padding-block: 16px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.footer-legal { color: var(--mist); max-width: none; }
.footer-copy { color: rgba(159, 179, 200, 0.78); max-width: none; }

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split-7-5,
  .split-8-4,
  .split-5-7 { grid-template-columns: minmax(0, 1fr); }
  .footer-main-grid { grid-template-columns: minmax(0, 1fr); }
}

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

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    padding: 6px var(--gutter) 18px;
    background: var(--panel);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity var(--dur) ease, transform var(--dur) ease, visibility var(--dur) ease;
  }

  .primary-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    padding: 14px 4px;
    font-size: 16px;
    border-bottom: 1px dashed rgba(23, 57, 90, 0.9);
  }

  .nav-link:last-child { border-bottom: 0; }

  .nav-link::after {
    left: 0;
    right: auto;
    width: 34px;
    bottom: -1px;
  }
}

@media (max-width: 880px) {
  .header-utility { display: none; }
  .header-rail-inner { min-height: 58px; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .footer-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nav-toggle-label { display: none; }
  .btn-entry { padding: 11px 16px; font-size: 13px; }
}

@media (max-width: 520px) {
  .footer-columns { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom-inner { flex-direction: column; align-items: flex-start; }
  .brand-glyph { width: 34px; height: 34px; font-size: 13px; }
}

/* ---------- 17. 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 { opacity: 1; transform: none; }
  .read-progress-fill { transition: none; }
}