/* ==========================================================================
   领航国际品牌 · 共享外壳样式表  /assets/site.css
   顺序：变量 → reset → 排版 → 网格与区块 → 通用组件 → 图片容器
        → 页头 → 页脚 → 响应式 → 焦点与动效降级
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  --ink: #0B1620;
  --deep: #08192B;
  --lake: #0E6BA8;
  --lake-2: #4E9FD1;
  --mist: #D7E3EC;
  --snow: #F7FAFC;
  --sun: #F2A93B;
  --flag: #E4572E;
  --aqua: #17C3B2;
  --ridge: #5A6B7B;

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

  --ease: cubic-bezier(.22, .61, .36, 1);
  --t-fast: 160ms;
  --t-base: 200ms;
  --t-slow: 240ms;

  --shell: 1320px;
  --pad-x: clamp(20px, 4.6vw, 96px);
  --gap: clamp(16px, 2vw, 28px);
  --announce-h: 44px;
  --header-h: 76px;

  --fs-display: clamp(38px, 6.6vw, 76px);
  --fs-h1: clamp(30px, 4.4vw, 49px);
  --fs-h2: clamp(24px, 3vw, 39px);
  --fs-h3: clamp(19px, 2.2vw, 25px);
  --fs-lead: clamp(17px, 1.6vw, 20px);
  --fs-body: 16px;
  --fs-sm: 14px;
  --fs-xs: 12px;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--snow);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.85;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: 0; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; border-top: 1px solid var(--mist); margin: 0; }

:where(h1, h2, h3, h4, [id]) { scroll-margin-top: calc(var(--announce-h) + var(--header-h) + 20px); }

html.is-nav-open,
html.is-nav-open body { overflow: hidden; }

/* ---------- 3. 中文排版与标题阶梯 ---------- */
.h-display {
  font-size: var(--fs-display);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--deep);
}
.h-1 {
  font-size: var(--fs-h1);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--deep);
}
.h-2 {
  font-size: var(--fs-h2);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--deep);
}
.h-3 {
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.34;
  color: var(--deep);
}
.lead {
  font-size: var(--fs-lead);
  line-height: 1.78;
  color: var(--ridge);
  max-width: 58ch;
}
.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--ridge);
  font-variant-numeric: tabular-nums;
}
.prose {
  max-width: 68ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--ink);
}
.prose > * + * { margin-top: 1.2em; }
.prose h2 { font-size: var(--fs-h3); font-weight: 700; line-height: 1.4; color: var(--deep); }
.prose h3 { font-size: var(--fs-lead); font-weight: 700; line-height: 1.5; color: var(--deep); }
.prose ul { list-style: disc; padding-left: 1.35em; }
.prose ol { list-style: decimal; padding-left: 1.35em; }
.prose li + li { margin-top: 0.4em; }
.prose li::marker { color: var(--lake); }
.prose a { color: var(--lake); text-decoration: none; border-bottom: 1px solid rgba(14, 107, 168, .35); }
.prose a:hover { border-bottom-color: var(--aqua); }
.prose strong { font-weight: 700; color: var(--deep); }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--mist);
  padding: 0.1em 0.4em;
  border-radius: 2px;
}
.prose blockquote {
  border-left: 2px solid var(--lake);
  padding-left: 1.2em;
  color: var(--ridge);
  font-size: var(--fs-lead);
  line-height: 1.7;
}

/* ---------- 4. 网格与区块 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.grid { display: grid; gap: var(--gap); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--aside { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

.section { padding-block: clamp(48px, 7vw, 110px); }
.section--tight { padding-block: clamp(32px, 4.5vw, 64px); }
.section--mist { background: var(--mist); }
.section--deep { background: var(--deep); color: var(--mist); }
.section--deep .h-1,
.section--deep .h-2,
.section--deep .h-3,
.section--deep .h-display { color: var(--snow); }

.section__head {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(20px, 3vw, 56px);
  align-items: end;
  margin-bottom: clamp(24px, 3vw, 48px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  color: var(--ridge);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--lake);
  flex: none;
}

.rule {
  height: 1px;
  background: var(--mist);
  border: 0;
  margin: 0;
}
.rule--lake { background: linear-gradient(90deg, var(--lake), rgba(14, 107, 168, 0)); }

/* ---------- 5. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  padding: 14px 22px;
  border: 1px solid transparent;
  border-radius: 2px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--t-base) var(--ease),
              background-color var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease),
              color var(--t-base) var(--ease);
}
.btn--primary { background: var(--lake); color: #fff; }
.btn--primary:hover { background: #0b567f; transform: translateY(-2px); }
.btn--sun { background: var(--sun); color: var(--deep); }
.btn--sun:hover { background: #d9932a; transform: translateY(-2px); }
.btn--outline { background: transparent; border-color: rgba(14, 107, 168, .45); color: var(--lake); }
.btn--outline:hover { background: var(--lake); color: #fff; border-color: var(--lake); transform: translateY(-2px); }
.btn--ghost { background: transparent; border-color: rgba(247, 250, 252, .35); color: var(--snow); }
.btn--ghost:hover { background: rgba(23, 195, 178, .16); border-color: var(--aqua); transform: translateY(-2px); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid currentColor;
  white-space: nowrap;
}
.tag--lake { color: var(--lake); }
.tag--sun { color: #8f5f10; background: rgba(242, 169, 59, .14); border-color: rgba(242, 169, 59, .45); }
.tag--flag { color: var(--flag); background: rgba(228, 87, 46, .12); border-color: rgba(228, 87, 46, .40); }
.tag--aqua { color: #0b7d72; background: rgba(23, 195, 178, .14); border-color: rgba(23, 195, 178, .45); }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--ridge);
}
.breadcrumbs a { color: var(--ridge); text-decoration: none; transition: color var(--t-fast) var(--ease); }
.breadcrumbs a:hover { color: var(--lake); }
.breadcrumbs__sep { opacity: 0.45; }

.card-grid { display: grid; gap: var(--gap); }
.card {
  position: relative;
  display: block;
  background: var(--snow);
  border: 1px solid var(--mist);
  padding: clamp(20px, 2.4vw, 32px);
  text-decoration: none;
  color: inherit;
  transition: transform var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease),
              opacity var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease);
}
.card:hover,
.card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--lake-2);
  box-shadow: 0 20px 44px -30px rgba(8, 25, 43, .6);
}
.card-grid:hover > .card:not(:hover) { opacity: 0.72; }
.card__title {
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--deep);
  margin-bottom: 10px;
}
.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--ridge);
}

.organic { border-radius: 4px 40px 4px 40px; }
.cut-top { clip-path: polygon(0 2.2%, 100% 0, 100% 100%, 0 100%); }

/* ---------- 6. 图片容器（页面阶段放置 <img>） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background:
    linear-gradient(140deg, var(--lake) 0%, var(--lake-2) 48%, var(--mist) 100%);
  isolation: isolate;
}
.media > img,
.media > picture > img,
.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--t-slow) var(--ease);
}
.media:hover > img,
.media:hover .media__img { transform: scale(1.02); }
.media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(8, 25, 43, .10) 0 1px, transparent 1px 72px);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--pano { aspect-ratio: 3 / 1; }
.media--map { aspect-ratio: 4 / 3; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 3;
  max-width: 100%;
  padding: 10px 16px;
  background: rgba(8, 25, 43, .82);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
}

/* ---------- 7. 页头 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--deep);
  color: var(--snow);
  font-size: var(--fs-sm);
  text-decoration: none;
  border-radius: 2px;
  transform: translateY(-180%);
  transition: transform var(--t-base) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--snow);
}

/* 公告带 */
.announce {
  position: relative;
  background: var(--deep);
  color: var(--snow);
  font-size: var(--fs-sm);
}
.announce__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  height: var(--announce-h);
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 18px);
}
.announce__tag {
  flex: none;
  padding: 3px 11px;
  border-radius: 999px;
  background: var(--sun);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.announce__track {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
  height: 22px;
}
.announce__item {
  position: absolute;
  inset: 0;
  line-height: 22px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--mist);
  opacity: 0;
  transform: translateY(7px);
  transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}
.announce__item.is-active { opacity: 1; transform: translateY(0); }
.announce__toggle {
  flex: none;
  padding: 4px 12px;
  border: 1px solid rgba(247, 250, 252, .3);
  border-radius: 999px;
  color: var(--snow);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.announce__toggle:hover { background: rgba(23, 195, 178, .16); border-color: var(--aqua); }
.announce__panel { background: #061320; border-top: 1px solid rgba(215, 227, 236, .14); }
.announce__panel[hidden] { display: none; }
.announce__panel-inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: 14px var(--pad-x);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  font-size: var(--fs-sm);
  color: var(--mist);
}
.announce__panel-text { margin: 0; }
.announce__more {
  flex: none;
  color: var(--aqua);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 195, 178, .4);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.announce__more:hover { color: var(--sun); border-bottom-color: var(--sun); }

/* 导航行 */
.masthead {
  position: relative;
  background: var(--snow);
  border-bottom: 1px solid var(--mist);
}
.masthead__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 32px);
}

.brand {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--deep);
}
.brand__mark {
  width: 26px;
  height: 26px;
  flex: none;
  fill: none;
  stroke: var(--lake);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke var(--t-base) var(--ease), transform var(--t-slow) var(--ease);
}
.brand:hover .brand__mark { stroke: var(--aqua); transform: rotate(18deg); }
.brand__name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
}

.primary-nav { margin-left: auto; }
.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(6px, 1.5vw, 26px);
}
.primary-nav__link {
  display: inline-block;
  padding: 26px 2px 22px;
  font-size: 15px;
  color: var(--ridge);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.primary-nav__link:hover { color: var(--lake); }
.primary-nav__link[aria-current="page"] {
  color: var(--deep);
  font-weight: 700;
  border-bottom-color: var(--lake);
}

.nav-aside { display: none; }
.nav-aside__title {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--sun);
  margin-bottom: 10px;
}
.nav-aside__list { display: grid; gap: 8px; }
.nav-aside__link {
  display: block;
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: var(--mist);
  text-decoration: none;
  padding: 8px 0 8px 12px;
  border-left: 1px solid rgba(215, 227, 236, .25);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.nav-aside__link:hover { color: var(--sun); border-left-color: var(--sun); }

.utility {
  flex: none;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: clamp(8px, 1.4vw, 20px);
}
.utility__query {
  padding: 9px 16px;
  border: 1px solid rgba(14, 107, 168, .35);
  border-radius: 999px;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--deep);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
}
.utility__query:hover { background: var(--lake); border-color: var(--lake); color: #fff; }
.utility__help {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--ridge);
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}
.utility__help svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.utility__help:hover { color: var(--lake); background: var(--mist); }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid rgba(14, 107, 168, .35);
  border-radius: 999px;
  color: var(--deep);
  font-size: var(--fs-sm);
  cursor: pointer;
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: var(--lake); background: var(--mist); }
.nav-toggle__icon {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
}
.nav-toggle__text { line-height: 1; }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--lake), var(--aqua) 68%, var(--sun));
  pointer-events: none;
  transition: transform 120ms linear;
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(8, 25, 43, .62);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-base) var(--ease), visibility 0s linear var(--t-base);
}
.nav-scrim[data-open="true"] {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--t-base) var(--ease), visibility 0s linear 0s;
}

/* 宽屏框架细线：导航延伸为页面左右边框 */
@media (min-width: 1280px) {
  .site-header::before,
  .site-header::after {
    content: "";
    position: fixed;
    top: 0;
    bottom: 0;
    width: 1px;
    z-index: 0;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(14, 107, 168, .34), rgba(14, 107, 168, .05));
  }
  .site-header::before { left: 34px; }
  .site-header::after { right: 34px; }
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(56px, 9vw, 140px);
  background: var(--deep);
  color: var(--mist);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .05) 0 1px, transparent 1px 128px),
    radial-gradient(120% 90% at 10% 0%, rgba(14, 107, 168, .55), transparent 62%),
    radial-gradient(90% 80% at 90% 100%, rgba(23, 195, 178, .18), transparent 62%);
}
.footer__inner {
  position: relative;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(48px, 7vw, 96px) var(--pad-x) clamp(28px, 4vw, 52px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.95fr);
  gap: clamp(32px, 5vw, 80px);
}
.footer__brand { min-width: 0; }
.footer__wordmark {
  font-size: clamp(26px, 3.6vw, 46px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--snow);
  margin: 0 0 16px;
}
.footer__note {
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: rgba(215, 227, 236, .78);
  max-width: 30ch;
  margin: 0 0 24px;
}
.footer__cta { margin-top: 4px; }

.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}
.footer__col-title {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--sun);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(215, 227, 236, .16);
}
.footer__list { display: grid; gap: 10px; }
.footer__link {
  font-size: var(--fs-sm);
  color: rgba(215, 227, 236, .82);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
  display: inline-block;
}
.footer__link:hover { color: var(--aqua); transform: translateX(3px); }

.footer__contact {
  position: relative;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 0 var(--pad-x) 20px;
}
.footer__contact-line {
  font-size: var(--fs-sm);
  line-height: 1.9;
  color: rgba(215, 227, 236, .72);
  padding-top: 20px;
  border-top: 1px solid rgba(215, 227, 236, .16);
}
.footer__legal {
  position: relative;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 0 var(--pad-x) clamp(28px, 4vw, 46px);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 24px;
}
.footer__legal-line {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.05em;
  line-height: 1.9;
  color: rgba(215, 227, 236, .58);
}

/* ---------- 9. 响应式 ---------- */
@media (max-width: 1279px) {
  .primary-nav__link { font-size: 14px; }
  .utility__query { padding: 8px 13px; }
}

@media (max-width: 1023px) {
  :root { --header-h: 64px; }

  .masthead__inner { min-height: var(--header-h); }
  .utility__query { display: none; }
  .nav-toggle { display: inline-flex; }

  .primary-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 85;
    width: min(84vw, 340px);
    margin: 0;
    padding: calc(var(--announce-h) + 28px) 24px 40px;
    background: var(--deep);
    border-right: 1px solid rgba(23, 195, 178, .35);
    overflow-y: auto;
    transform: translateX(-104%);
    visibility: hidden;
    transition: transform var(--t-slow) var(--ease), visibility 0s linear var(--t-slow);
  }
  .primary-nav[data-open="true"] {
    transform: translateX(0);
    visibility: visible;
    transition: transform var(--t-slow) var(--ease), visibility 0s linear 0s;
  }
  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .primary-nav__link {
    display: block;
    padding: 15px 0;
    font-size: 17px;
    color: var(--mist);
    border-bottom: 1px solid rgba(215, 227, 236, .14);
  }
  .primary-nav__link:hover { color: var(--aqua); }
  .primary-nav__link[aria-current="page"] {
    color: var(--sun);
    border-bottom-color: rgba(242, 169, 59, .5);
  }
  .nav-aside {
    display: block;
    margin-top: 28px;
  }

  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--aside,
  .section__head,
  .footer__inner { grid-template-columns: minmax(0, 1fr); }
  .footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .nav-toggle { display: none; }
  .nav-aside { display: none; }
}

@media (max-width: 767px) {
  :root {
    --announce-h: 46px;
    --fs-display: clamp(32px, 9vw, 46px);
    --fs-h1: clamp(26px, 7vw, 34px);
    --fs-h2: clamp(22px, 6vw, 28px);
  }

  .announce__inner { gap: 10px; }
  .announce__tag { font-size: 11px; padding: 2px 8px; }
  .announce__toggle { padding: 3px 9px; }

  .brand__name { font-size: 18px; }
  .nav-toggle__text { display: none; }

  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .footer__cols { grid-template-columns: minmax(0, 1fr); }
  .footer__legal { flex-direction: column; }
  .media--wide,
  .media--pano { aspect-ratio: 16 / 9; }
}

/* ---------- 10. 焦点与动效降级 ---------- */
:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 2px;
  border-radius: 2px;
}

@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;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover,
  .card:focus-visible,
  .btn:hover,
  .footer__link:hover { transform: none; }
  .card-grid:hover > .card:not(:hover) { opacity: 1; }
  .media:hover > img,
  .media:hover .media__img { transform: none; }
}