/* =========================================================
   乐鱼主站 · 共享样式表  /assets/site.css
   高原赛事档案系统 · 数据叙事型排版
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 5.5rem;
}

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

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

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

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

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

hr { border: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  --sky: #2A6FB0;
  --sky-deep: #0E2A47;
  --tibet-red: #C0392B;
  --banner-orange: #F39C12;
  --turquoise: #1ABC9C;
  --electric: #00E5FF;
  --violet: #7B61FF;

  --mist: #F5F7FA;
  --ink: #101820;
  --paper: #FFFFFF;

  --grid: rgba(42, 111, 176, 0.12);
  --line: rgba(42, 111, 176, 0.22);
  --line-strong: rgba(42, 111, 176, 0.36);

  --shell: 1240px;
  --gutter: clamp(1.05rem, 4vw, 3rem);

  --font-heading: "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Inter", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, "Menlo", "Consolas", monospace;

  --ease-out: cubic-bezier(0.22, 0.68, 0.36, 1);
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  margin: 0;
  min-height: 100%;
  background-color: var(--mist);
  background-image:
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    linear-gradient(180deg, var(--grid) 1px, transparent 1px);
  background-size: 96px 96px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

@media (min-width: 900px) {
  body { background-attachment: fixed; }
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--sky-deep);
}

h1 { font-size: clamp(2.05rem, 6vw, 3.9rem); }
h2 { font-size: clamp(1.5rem, 3.4vw, 2.35rem); }
h3 { font-size: clamp(1.12rem, 2.1vw, 1.5rem); }
h4 { font-size: clamp(1rem, 1.5vw, 1.15rem); letter-spacing: 0; }

p { text-wrap: pretty; }

a { color: var(--sky); text-decoration: none; }
a:hover { color: var(--tibet-red); }

strong { font-weight: 700; color: var(--sky-deep); }

::selection { background: var(--electric); color: #04202F; }

:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: 2px;
}
.site-header :focus-visible,
.site-footer :focus-visible,
.quickbar :focus-visible,
.skip-link:focus-visible {
  outline-color: var(--electric);
}

[id] { scroll-margin-top: 5.5rem; }

#main-content { display: block; min-height: 50vh; }

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  top: 0;
  left: -9999px;
  z-index: 200;
  padding: 0.8rem 1.3rem;
  background: var(--sky-deep);
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 2px solid var(--electric);
}

.skip-link:focus {
  left: 0.6rem;
  top: 0.6rem;
  outline: none;
  color: #FFFFFF;
}

/* ---------- 5. 容器与分节 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(2.6rem, 6vw, 5rem); }
.section--tight { padding-block: clamp(1.6rem, 3.6vw, 2.8rem); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.9rem 1.6rem;
  margin-bottom: clamp(1.2rem, 3vw, 2.2rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--sky);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--tibet-red);
  flex-shrink: 0;
}

.note-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: rgba(42, 111, 176, 0.72);
}

.speedline {
  height: 1px;
  border: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(0, 229, 255, 0.85) 42%,
    rgba(192, 57, 43, 0.55) 78%,
    transparent 100%
  );
}

/* ---------- 6. 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(1rem, 2.4vw, 2rem);
}

.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)); }

@media (max-width: 980px) {
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.82rem 1.5rem;
  background: var(--sky);
  border: 1px solid var(--sky);
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background: var(--tibet-red);
  border-color: var(--tibet-red);
  color: #FFFFFF;
}
.btn--primary:hover {
  background: transparent;
  color: var(--tibet-red);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--sky-deep);
}
.btn--ghost:hover {
  background: rgba(42, 111, 176, 0.06);
  border-color: var(--sky);
  color: var(--sky);
}

.btn--electric {
  background: transparent;
  border-color: var(--electric);
  color: var(--sky-deep);
}
.btn--electric:hover {
  background: var(--electric);
  color: #04202F;
}

/* ---------- 8. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.26rem 0.56rem;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.4;
  color: var(--sky);
  white-space: nowrap;
}

.tag--red { color: var(--tibet-red); }
.tag--green { color: var(--turquoise); }
.tag--orange { color: var(--banner-orange); }
.tag--blue { color: var(--sky); }

/* ---------- 9. 资料卡 ---------- */
.card {
  position: relative;
  padding: clamp(1.05rem, 2.2vw, 1.65rem);
  background: var(--paper);
  border: 1px solid var(--line);
}

.card--accent::before {
  content: "";
  position: absolute;
  left: -1px;
  right: -1px;
  top: -1px;
  height: 3px;
  background: var(--tibet-red);
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--sky-deep);
  margin-bottom: 0.45rem;
}

.data-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- 10. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, var(--sky-deep) 0%, var(--sky) 68%, #3E8FD0 100%);
  border: 1px solid var(--line);
}

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

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 22% 32%, rgba(0, 229, 255, 0.5) 0 2px, transparent 2px),
    radial-gradient(circle at 68% 58%, rgba(243, 156, 18, 0.65) 0 2px, transparent 2px),
    radial-gradient(circle at 44% 78%, rgba(26, 188, 156, 0.55) 0 2px, transparent 2px),
    linear-gradient(115deg, transparent 42%, rgba(255, 255, 255, 0.09) 42.4%, transparent 43%);
  opacity: 0.9;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 0.75rem 0.95rem;
  background: linear-gradient(transparent, rgba(14, 42, 71, 0.88));
  color: #DCEBF7;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  line-height: 1.5;
}

/* ---------- 11. 面包屑与正文 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: rgba(16, 24, 32, 0.55);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 0.5rem; }
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: rgba(42, 111, 176, 0.45);
}
.breadcrumb a { color: var(--sky); }
.breadcrumb a:hover { color: var(--tibet-red); }
.breadcrumb [aria-current="page"] { color: rgba(16, 24, 32, 0.62); }

.prose {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

.prose > * + * { margin-top: 1.05em; }
.prose h2 { margin-top: 2.1em; }
.prose h3 { margin-top: 1.6em; }
.prose ul, .prose ol { padding-left: 1.35em; list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 0.4em; }
.prose a { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- 12. 目录跟随 ---------- */
[data-toc-link] {
  transition: color 0.2s ease, border-color 0.2s ease;
}
[data-toc-link].is-current {
  color: var(--tibet-red);
}

/* ---------- 13. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--paper);
}

.header-upper {
  position: relative;
  max-height: 7rem;
  overflow: hidden;
  background: var(--sky-deep);
  color: #D8E9F5;
  transition: max-height 0.28s var(--ease-out), opacity 0.22s ease;
}

.header-upper::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.06) 0 1px,
    transparent 1px 88px
  );
}

.site-header[data-scrolled] .header-upper {
  max-height: 0;
  opacity: 0;
  pointer-events: none;
}

.header-upper__inner {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem clamp(1rem, 3vw, 2.4rem);
  min-height: 4.15rem;
  padding-block: 0.6rem;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
  flex-shrink: 0;
}
.brand:hover { color: inherit; }

.brand__mark {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 28px;
  flex-shrink: 0;
}

.brand__mark i {
  display: block;
  width: 3px;
  transform-origin: bottom center;
  animation: bandSway 3.6s ease-in-out infinite;
}

.brand__mark i:nth-child(1) { height: 62%; background: var(--electric); animation-delay: 0s; }
.brand__mark i:nth-child(2) { height: 88%; background: var(--banner-orange); animation-delay: 0.35s; }
.brand__mark i:nth-child(3) { height: 100%; background: var(--tibet-red); animation-delay: 0.7s; }
.brand__mark i:nth-child(4) { height: 78%; background: var(--turquoise); animation-delay: 1.05s; }
.brand__mark i:nth-child(5) { height: 54%; background: var(--violet); animation-delay: 1.4s; }

@keyframes bandSway {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(0.7); }
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.24;
}

.brand__name {
  font-family: var(--font-heading);
  font-size: 1.06rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: #FFFFFF;
}

.brand__tagline {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: rgba(216, 233, 245, 0.64);
}

/* 状态 */
.header-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: rgba(216, 233, 245, 0.8);
}

.header-status__dot {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  background: var(--turquoise);
  animation: statusPulse 2.6s ease-out infinite;
}

@keyframes statusPulse {
  0% { box-shadow: 0 0 0 0 rgba(26, 188, 156, 0.55); }
  70% { box-shadow: 0 0 0 9px rgba(26, 188, 156, 0); }
  100% { box-shadow: 0 0 0 0 rgba(26, 188, 156, 0); }
}

.header-upper__actions {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-shrink: 0;
}

.header-meta-link {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: rgba(216, 233, 245, 0.82);
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(216, 233, 245, 0.32);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.header-meta-link:hover {
  color: #FFFFFF;
  border-bottom-color: var(--electric);
}

/* 栏目层 */
.header-lower {
  position: relative;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.header-lower__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
  min-height: 3.5rem;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.4rem, 1.8vw, 1.35rem);
}

.primary-nav__list > li > a {
  position: relative;
  display: block;
  padding: 1rem 0.35rem;
  font-family: var(--font-heading);
  font-size: 0.93rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--sky-deep);
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s ease;
}

.primary-nav__list > li > a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--tibet-red);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.26s var(--ease-out);
}

.primary-nav__list > li > a:hover { color: var(--sky); }
.primary-nav__list > li > a:hover::after { transform: scaleX(1); }

.primary-nav__list > li > a[aria-current="page"] { color: var(--tibet-red); }
.primary-nav__list > li > a[aria-current="page"]::after { transform: scaleX(1); }

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.62rem 1.05rem;
  background: var(--tibet-red);
  border: 1px solid var(--tibet-red);
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.header-cta:hover {
  background: transparent;
  color: var(--tibet-red);
  transform: translateY(-1px);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.75rem;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--sky-deep);
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  cursor: pointer;
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.24s var(--ease-out), opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) 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(-6px) rotate(-45deg); }

/* 滚动进度 */
.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--sky) 0%, var(--electric) 45%, var(--tibet-red) 88%);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* ---------- 14. 悬浮快捷栏 ---------- */
.quickbar {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 55;
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 4px;
  background: rgba(14, 42, 71, 0.9);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-right: 0;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.quickbar__item {
  display: block;
  width: 100%;
  padding: 1.05rem 0.5rem;
  background: transparent;
  border: 0;
  color: #B9D6EA;
  font-family: var(--font-heading);
  font-size: 0.73rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  line-height: 1;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease, opacity 0.28s ease, visibility 0.28s ease;
}

.quickbar__item:hover,
.quickbar__item:focus-visible {
  color: #04202F;
  background: var(--electric);
}

.quickbar__item--top {
  opacity: 0;
  visibility: hidden;
}

.quickbar__item--top[data-visible] {
  opacity: 1;
  visibility: visible;
}

/* ---------- 15. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  background: var(--sky-deep);
  color: #C6DCEC;
}

.footer-bands {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  height: 4px;
}

.footer-bands span:nth-child(1) { background: var(--sky); }
.footer-bands span:nth-child(2) { background: var(--electric); }
.footer-bands span:nth-child(3) { background: var(--tibet-red); }
.footer-bands span:nth-child(4) { background: var(--banner-orange); }
.footer-bands span:nth-child(5) { background: var(--turquoise); }

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
  gap: clamp(1.6rem, 3.4vw, 3rem);
  padding-block: clamp(2.6rem, 6vw, 4.2rem);
}

.footer-brand__name {
  font-family: var(--font-heading);
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #FFFFFF;
  margin-bottom: 0.7rem;
}

.footer-brand__desc {
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(198, 220, 236, 0.78);
  max-width: 34ch;
}

.footer-brand__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: 1.15rem;
  padding: 0.62rem 1.05rem;
  border: 1px solid rgba(0, 229, 255, 0.5);
  color: #D6EEFA;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.footer-brand__cta:hover {
  background: var(--electric);
  border-color: var(--electric);
  color: #04202F;
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--electric);
  padding-bottom: 0.6rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid rgba(0, 229, 255, 0.22);
}

.footer-list li + li { margin-top: 0.62rem; }

.footer-list a {
  font-size: 0.92rem;
  color: #C6DCEC;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.footer-list a:hover {
  color: #FFFFFF;
  border-bottom-color: var(--tibet-red);
}

.footer-list--contact li {
  display: grid;
  grid-template-columns: 3.1rem minmax(0, 1fr);
  gap: 0.55rem;
  align-items: baseline;
  font-size: 0.88rem;
}
.footer-list--contact li + li { margin-top: 0.75rem; }

.footer-key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: rgba(198, 220, 236, 0.58);
}

.footer-val {
  color: #E4F0F9;
  word-break: break-word;
  line-height: 1.65;
}

.footer-base {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.6rem;
  padding-block: 1.15rem;
  font-size: 0.8rem;
  color: rgba(198, 220, 236, 0.72);
}

.footer-icp {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* ---------- 16. 滚动显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s var(--ease-out);
}

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

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .header-cta { display: none; }

  .header-upper__inner {
    gap: 0.5rem 1.2rem;
  }

  .header-status {
    order: 3;
    width: 100%;
    font-size: 0.74rem;
  }

  .primary-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 5;
    max-height: min(72vh, 34rem);
    overflow-y: auto;
    background: #FFFFFF;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 22px 44px rgba(14, 42, 71, 0.16);
  }

  .primary-nav[data-open] {
    display: block;
    animation: navDrop 0.22s var(--ease-out);
  }

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

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.4rem var(--gutter) 1rem;
  }

  .primary-nav__list > li > a {
    padding: 0.95rem 0.2rem;
    font-size: 1rem;
    border-bottom: 1px solid var(--grid);
  }

  .primary-nav__list > li:last-child > a { border-bottom: 0; }

  .primary-nav__list > li > a::after { display: none; }

  .primary-nav__list > li > a[aria-current="page"] {
    padding-left: 0.85rem;
    border-left: 3px solid var(--tibet-red);
  }

  .quickbar__item {
    padding: 0.85rem 0.42rem;
    font-size: 0.68rem;
    letter-spacing: 0.18em;
  }
}

@media (max-width: 640px) {
  .header-upper__inner {
    min-height: 3.6rem;
    padding-block: 0.55rem;
  }

  .brand__tagline { font-size: 0.66rem; letter-spacing: 0.1em; }
  .brand__mark { height: 24px; }

  .header-upper__actions { display: none; }

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

  .footer-base__inner { justify-content: flex-start; }

  .quickbar {
    padding: 3px;
  }

  .quickbar__item {
    padding: 0.68rem 0.36rem;
    font-size: 0.62rem;
    letter-spacing: 0.14em;
  }
}

/* ---------- 18. 无障碍与动效偏好 ---------- */
@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;
  }

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