/* ============================================================
   /assets/site.css — 万博体育中心 共享层
   深空蓝底 · 条目式报头 · 三条业务线色相 · 等宽索引
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, hr { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, picture, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #0A1524;
  --ink-800: #14263F;
  --ink-700: #2A3F5C;
  --jade: #17B98A;
  --jade-soft: #6FE3C0;
  --gold: #D8A94A;
  --violet: #7C5CFF;
  --violet-soft: #B4A4FF;
  --paper: #E8EFF7;
  --mist: #93A6BE;
  --sheet: #F3F6FA;
  --amber: #F0A93B;

  --line: rgba(147, 166, 190, .20);
  --line-strong: rgba(147, 166, 190, .38);

  --shell-w: 1280px;
  --shell: min(var(--shell-w), 100% - 2.5rem);
  --shell-wide: min(1560px, 100% - 2rem);

  --r-s: 10px;
  --r-m: 18px;
  --r-l: 30px;
  --r-xl: 56px;

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

  --ease: cubic-bezier(.22, .61, .36, 1);
  --t-fast: .2s;
  --t-mid: .32s;
  --t-slow: .42s;

  --shadow: 0 24px 60px -36px rgba(0, 0, 0, .92);
}

/* ---------- 3. 基底与排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--paper);
  background: var(--ink-900);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(52rem 34rem at 84% -8%, rgba(23, 185, 138, .16), transparent 60%),
    radial-gradient(44rem 30rem at -6% 18%, rgba(124, 92, 255, .14), transparent 62%),
    radial-gradient(36rem 28rem at 58% 108%, rgba(216, 169, 74, .10), transparent 66%);
}

#main-content {
  position: relative;
  z-index: 1;
  flex: 1 0 auto;
  display: block;
  outline: none;
}

[id] { scroll-margin-top: 8.5rem; }

h1, h2, h3, h4 {
  font-weight: 900;
  letter-spacing: .04em;
  line-height: 1.24;
  color: #fff;
}
h1 { font-size: clamp(2rem, 5.2vw, 4rem); }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.5rem); }
h3 { font-size: clamp(1.15rem, 2.1vw, 1.6rem); }
h4 { font-size: 1.05rem; }

p { overflow-wrap: break-word; }

:focus-visible {
  outline: 2px solid var(--jade-soft);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection { background: rgba(23, 185, 138, .35); color: #fff; }

/* ---------- 4. 通用布局 ---------- */
.shell { width: var(--shell); margin-inline: auto; }
.shell--wide { width: var(--shell-wide); margin-inline: auto; }

.section { padding-block: clamp(3rem, 7vw, 6.5rem); }
.section--tight { padding-block: clamp(1.8rem, 4vw, 3.4rem); }

.split {
  display: grid;
  gap: clamp(1.4rem, 4vw, 3.5rem);
  align-items: start;
}
.split--42 { grid-template-columns: minmax(0, 42fr) minmax(0, 58fr); }
.split--34 { grid-template-columns: minmax(0, 34fr) minmax(0, 66fr); }
.split--58 { grid-template-columns: minmax(0, 58fr) minmax(0, 42fr); }
.split__aside { position: sticky; top: 9.5rem; align-self: start; }

.grid--auto {
  display: grid;
  gap: clamp(1rem, 2.6vw, 1.8rem);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.stack { display: flex; flex-direction: column; gap: var(--stack-gap, 1rem); }
.stack--s { --stack-gap: .6rem; }
.stack--l { --stack-gap: 2rem; }

.rule { height: 1px; background: var(--line); border: 0; }
.rule--dashed { height: 0; border-top: 1px dashed var(--line); }

/* ---------- 5. 文本元件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: .6;
}

.lede {
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  line-height: 1.85;
  color: #C6D4E6;
  max-width: 62ch;
}

.prose { max-width: 68ch; }
.prose p + p { margin-top: 1.1em; }
.prose h2 { margin-top: 2.2em; margin-bottom: .7em; }
.prose h3 { margin-top: 1.8em; margin-bottom: .6em; }
.prose ul, .prose ol { margin-top: 1em; padding-left: 1.15em; }
.prose li { margin-top: .45em; list-style: disc; }
.prose ol li { list-style: decimal; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}

/* ---------- 6. 标签与按钮 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .42rem;
  padding: .28rem .68rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}
.tag--jade { color: var(--jade-soft); border-color: rgba(23, 185, 138, .44); background: rgba(23, 185, 138, .08); }
.tag--gold { color: var(--gold); border-color: rgba(216, 169, 74, .44); background: rgba(216, 169, 74, .08); }
.tag--violet { color: var(--violet-soft); border-color: rgba(124, 92, 255, .44); background: rgba(124, 92, 255, .10); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  padding: .8rem 1.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .06em;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn--jade { background: var(--jade); color: #04241c; }
.btn--jade:hover { background: var(--jade-soft); }
.btn--ghost { border-color: rgba(23, 185, 138, .45); color: var(--jade-soft); }
.btn--ghost:hover { background: rgba(23, 185, 138, .12); color: #fff; }
.btn--outline { border-color: var(--line-strong); color: var(--paper); }
.btn--outline:hover { border-color: var(--jade-soft); color: #fff; }
.btn--mono { font-family: var(--font-mono); font-size: 12px; letter-spacing: .16em; }

/* ---------- 7. 面板 ---------- */
.panel {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  padding: clamp(1.1rem, 2.6vw, 1.9rem);
}
.panel--flush { background: transparent; }
.panel--organic { border-radius: var(--r-xl) var(--r-m) var(--r-xl) var(--r-m); }
.panel--jade {
  border-color: rgba(23, 185, 138, .34);
  box-shadow: inset 0 1px 0 rgba(23, 185, 138, .18);
}

/* ---------- 8. 图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-m);
  background: linear-gradient(135deg, var(--ink-800), #0d1c2e);
  isolation: isolate;
}
.media::before { content: ""; display: block; padding-top: 56.25%; }
.media--wide::before { padding-top: 42%; }
.media--tall::before { padding-top: 115%; }
.media--square::before { padding-top: 100%; }
.media > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 21, 36, 0) 38%, rgba(10, 21, 36, .86) 100%);
}
.media__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: .95rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}
.media[data-placeholder] { border: 1px dashed var(--line-strong); }
.media[data-placeholder]::after {
  content: attr(data-placeholder);
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  padding: 1rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(147, 166, 190, .62);
}

/* ---------- 9. 面包屑 / 纸面 / 目录 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mist);
}
.crumbs a { transition: color var(--t-fast) var(--ease); }
.crumbs a:hover { color: var(--jade-soft); }
.crumbs__sep { color: rgba(147, 166, 190, .45); }
.crumbs [aria-current="page"] { color: var(--paper); }

.sheet {
  background: var(--sheet);
  color: #16273d;
  border-radius: var(--r-l);
  padding: clamp(1.5rem, 4vw, 3rem);
  font-size: 16.5px;
  line-height: 1.9;
}
.sheet h2, .sheet h3, .sheet h4 { color: #0A1524; }
.sheet a { color: #0F7F63; text-decoration: underline; text-underline-offset: 3px; }

.toc { position: relative; }
.toc__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: .7rem;
}
.toc__list { display: flex; flex-direction: column; gap: .1rem; }
.toc__link {
  display: block;
  padding: .42rem .7rem;
  border-left: 1px solid transparent;
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  color: var(--mist);
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
}
.toc__link:hover { color: var(--paper); background: rgba(147, 166, 190, .08); }
.toc__link.is-active {
  color: #fff;
  border-left-color: var(--jade);
  background: rgba(23, 185, 138, .10);
}

/* ---------- 10. 页头 ---------- */
.skip-link {
  position: absolute;
  left: 50%;
  top: -120px;
  transform: translateX(-50%);
  z-index: 90;
  padding: .65rem 1.2rem;
  background: var(--jade);
  color: #04241c;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  border-radius: 0 0 12px 12px;
  transition: top var(--t-fast) var(--ease);
}
.skip-link:focus { top: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  flex: 0 0 auto;
  background: linear-gradient(180deg, rgba(10, 21, 36, .97) 0%, rgba(10, 21, 36, .86) 100%);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow var(--t-mid) var(--ease);
}
.site-header.is-condensed { box-shadow: 0 20px 44px -32px rgba(0, 0, 0, .95); }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--jade), var(--gold) 55%, var(--violet));
}

/* 报头 */
.masthead__inner {
  position: relative;
  width: var(--shell);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.05rem 0 .85rem;
  transition: padding var(--t-mid) var(--ease);
}
.masthead__meta {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: .1rem;
  max-width: 28ch;
  transition: opacity var(--t-fast) var(--ease);
}
.masthead__tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mist);
}
.masthead__shift {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: rgba(147, 166, 190, .72);
}
.masthead__shift .mono { color: var(--gold); }

.masthead__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .18rem;
  text-align: center;
}
.masthead__name {
  font-size: clamp(1.35rem, 2.6vw, 1.95rem);
  font-weight: 900;
  letter-spacing: .22em;
  line-height: 1.12;
  color: #fff;
  transition: font-size var(--t-mid) var(--ease), letter-spacing var(--t-mid) var(--ease);
}
.masthead__line {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--mist);
}

.masthead__status {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: .55rem;
}
.status-chip {
  display: inline-flex;
  align-items: center;
  gap: .42rem;
  padding: .32rem .7rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
  white-space: nowrap;
}
.status-chip--jade {
  background: var(--jade);
  border-color: transparent;
  color: #04241c;
  font-weight: 700;
  transition: background var(--t-fast) var(--ease);
}
.status-chip--jade:hover { background: var(--jade-soft); }
.status-chip__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--jade);
  animation: chipPulse 2.6s var(--ease) infinite;
}
@keyframes chipPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(23, 185, 138, .5); }
  50% { box-shadow: 0 0 0 5px rgba(23, 185, 138, 0); }
}

.site-header.is-condensed .masthead__inner { padding: .5rem 0 .45rem; }
.site-header.is-condensed .masthead__meta { opacity: 0; pointer-events: none; }
.site-header.is-condensed .masthead__name { font-size: 1.15rem; letter-spacing: .18em; }
.site-header.is-condensed .masthead__line { display: none; }

/* 栏目带 */
.navbar {
  position: relative;
  border-top: 1px solid var(--line);
  background: rgba(20, 38, 63, .42);
}
.navbar__inner {
  position: relative;
  width: var(--shell);
  margin-inline: auto;
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav { display: flex; justify-content: center; }
.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(.4rem, 2vw, 1.9rem);
}
.nav__link {
  display: inline-block;
  position: relative;
  padding: .95rem .1rem;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--mist);
  transition: color var(--t-fast) var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .5rem;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-mid) var(--ease);
}
.nav__link:hover { color: var(--jade-soft); }
.nav__link:hover::after { transform: scaleX(1); }
.nav__link[aria-current="page"] { color: #fff; }
.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--jade);
  height: 2px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  padding: .6rem .1rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--paper);
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
}
.nav-toggle__bars { display: grid; gap: 4px; width: 20px; }
.nav-toggle__bars i {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.nav-toggle[aria-expanded="true"] i:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] i:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

.navbar__cta {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  padding: .48rem 1rem;
  border: 1px solid rgba(23, 185, 138, .5);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--jade-soft);
  white-space: nowrap;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.navbar__cta:hover { background: rgba(23, 185, 138, .18); color: #fff; }

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  margin-top: clamp(3rem, 8vw, 7rem);
  background: linear-gradient(180deg, rgba(20, 38, 63, .68) 0%, rgba(10, 21, 36, .99) 72%);
  border-top: 1px solid var(--line);
}
.footer__spectrum { display: flex; height: 3px; }
.footer__spectrum span { flex: 1 1 0; }
.footer__spectrum span:nth-child(1) { background: linear-gradient(90deg, rgba(23, 185, 138, .2), var(--jade)); }
.footer__spectrum span:nth-child(2) { background: linear-gradient(90deg, var(--jade), var(--gold)); }
.footer__spectrum span:nth-child(3) { background: linear-gradient(90deg, var(--gold), var(--violet), rgba(124, 92, 255, .35)); }

.footer__inner {
  width: var(--shell);
  margin-inline: auto;
  padding: clamp(2.2rem, 5vw, 4rem) 0 clamp(1.4rem, 3vw, 2.2rem);
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
  gap: clamp(1.4rem, 3.5vw, 3rem);
}
.footer__name {
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  font-weight: 900;
  letter-spacing: .16em;
  color: #fff;
}
.footer__line {
  margin-top: .35rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
}
.footer__note {
  margin-top: .9rem;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}
.footer__col-title {
  padding-bottom: .6rem;
  margin-bottom: .7rem;
  border-bottom: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}
.footer__links { display: flex; flex-direction: column; gap: .45rem; }
.footer__link {
  display: inline-block;
  font-size: 15px;
  color: #C6D4E6;
  transition: color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.footer__link:hover { color: var(--jade-soft); transform: translateX(3px); }

.footer__contact {
  width: var(--shell);
  margin-inline: auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.1rem 2rem;
  padding: 1.5rem 0;
  border-top: 1px dashed var(--line);
  border-bottom: 1px dashed var(--line);
}
.footer__label {
  display: block;
  margin-bottom: .28rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}
.footer__value {
  display: block;
  font-size: 14.5px;
  line-height: 1.65;
  color: #D5E1F0;
  overflow-wrap: anywhere;
}

.footer__base {
  width: var(--shell);
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .7rem 1.6rem;
  padding: 1.4rem 0 2.2rem;
  font-size: 13px;
  color: var(--mist);
}
.footer__icp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}
.footer__legal {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
}
.footer__legal a { transition: color var(--t-fast) var(--ease); }
.footer__legal a:hover { color: var(--jade-soft); }

/* ---------- 12. 滚动交互件 ---------- */
.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 60;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(23, 185, 138, .42);
  background: rgba(20, 38, 63, .92);
  color: var(--jade-soft);
  font-size: 17px;
  line-height: 1;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease),
              visibility var(--t-mid) var(--ease), background var(--t-fast) var(--ease);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: rgba(23, 185, 138, .22); color: #fff; }

html.has-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}
html.has-reveal [data-reveal].is-visible { opacity: 1; transform: none; }
html.has-reveal [data-reveal="2"] { transition-delay: .08s; }
html.has-reveal [data-reveal="3"] { transition-delay: .16s; }
html.has-reveal [data-reveal="4"] { transition-delay: .24s; }

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1100px) {
  .masthead__tagline { display: none; }
}

@media (max-width: 1000px) {
  .split,
  .split--42,
  .split--34,
  .split--58 { grid-template-columns: minmax(0, 1fr); }
  .split__aside { position: static; }
}

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

@media (max-width: 899px) {
  .masthead__inner {
    flex-direction: column;
    gap: .5rem;
    padding: .85rem 0 .7rem;
  }
  .masthead__brand { order: 1; }
  .masthead__status {
    order: 2;
    position: static;
    transform: none;
    flex-wrap: wrap;
    justify-content: center;
  }
  .masthead__meta {
    order: 3;
    position: static;
    transform: none;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: .35rem 1rem;
    max-width: none;
  }
  .masthead__tagline { display: none; }
  .site-header.is-condensed .masthead__meta { opacity: 1; pointer-events: auto; }
  .site-header.is-condensed .masthead__name { font-size: 1.25rem; }

  .navbar__inner { justify-content: space-between; }
  .nav-toggle { display: inline-flex; position: static; transform: none; }
  .navbar__cta { position: static; transform: none; }

  .nav {
    position: absolute;
    top: calc(100% + .55rem);
    left: 0;
    right: 0;
    display: none;
    padding: .55rem;
    background: rgba(10, 21, 36, .985);
    border: 1px solid var(--line);
    border-radius: var(--r-m);
    box-shadow: var(--shadow);
    z-index: 5;
  }
  .nav[data-open] { display: block; }
  .nav__list { flex-direction: column; align-items: stretch; gap: .15rem; }
  .nav__link {
    display: block;
    padding: .8rem .95rem;
    border-radius: 12px;
    font-size: 13px;
  }
  .nav__link::after { display: none; }
  .nav__link:hover,
  .nav__link[aria-current="page"] { background: rgba(23, 185, 138, .12); color: #fff; }
}

@media (max-width: 620px) {
  :root { --shell: min(var(--shell-w), 100% - 1.8rem); }
  body { font-size: 16px; }
  .footer__inner { grid-template-columns: minmax(0, 1fr); }
  .footer__legal { margin-left: 0; }
  .navbar__cta { display: none; }
  .to-top { width: 42px; height: 42px; }
}

/* ---------- 14. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html.has-reveal [data-reveal] { opacity: 1 !important; transform: none !important; }
  .btn:hover, .footer__link:hover { transform: none; }
}