/* ==========================================================
   万利官网 · 共享站点样式  /assets/site.css
   深墨蓝基底 · 琥珀金入口 · 冷灰绿稳定态 · 信号橙异常
   ========================================================== */

/* ---------- 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, figcaption, blockquote, dl, dd { margin: 0; }
ul[class], ol[class] { list-style: none; padding: 0; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
main { display: block; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --ink-900: #071A2B;
  --ink-800: #0C2438;
  --ink-700: #15344D;
  --amber-500: #F2A93B;
  --amber-300: #FFD27A;
  --orange-500: #E8622C;
  --green-400: #6FAF9B;
  --paper-050: #F4F1EA;
  --white: #FFFFFF;
  --mist-400: #8FA3B5;
  --red-600: #C0442E;

  /* 字体 */
  --font-display: "Noto Sans SC", "Source Han Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  /* 尺度 */
  --rail-w: 96px;
  --shell-max: 1280px;
  --pad-x: clamp(18px, 4vw, 48px);
  --radius-lg: 26px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;

  /* 线条与动效 */
  --hairline: 1px solid rgba(143, 163, 181, 0.20);
  --hairline-soft: 1px solid rgba(143, 163, 181, 0.13);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 180ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 520px at 88% -8%, rgba(21, 52, 77, 0.55), transparent 62%),
    radial-gradient(760px 420px at 0% 4%, rgba(242, 169, 59, 0.06), transparent 60%);
  background-repeat: no-repeat;
  color: var(--paper-050);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (min-width: 961px) {
  body { padding-left: var(--rail-w); }
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--white);
}

p { text-wrap: pretty; }

::selection { background: var(--amber-500); color: var(--ink-900); }

/* ---------- 4. 无障碍 ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--amber-300);
  outline-offset: 3px;
}

#main-content:focus { outline: none; }

/* ---------- 5. 布局工具 ---------- */
.content-wrap {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.section { padding-block: clamp(34px, 5vw, 68px); }
.section--tight { padding-block: clamp(20px, 2.8vw, 34px); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 24px);
}
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

.rule {
  height: 1px;
  border: 0;
  background: rgba(143, 163, 181, 0.18);
}

/* ---------- 6. 标题与文本 ---------- */
.display-1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
}
.display-2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--white);
}
.display-3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 2.4vw, 28px);
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--white);
}
.lede {
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.78);
}
.mono-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-400);
}

/* ---------- 7. 页头 · 品牌轨道 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  border-bottom: var(--hairline);
}

.skip-link {
  position: absolute;
  top: -120px;
  left: 14px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: var(--amber-500);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: top 200ms var(--ease);
}
.skip-link:focus { top: 0; }

.brand-rail {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 95;
  width: var(--rail-w);
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 24px 0 26px;
  background: var(--ink-800);
  border-right: var(--hairline);
}
@media (min-width: 961px) {
  .brand-rail { display: flex; }
}

.brand-rail__mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--amber-500);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.brand-rail__mark:hover { background: var(--amber-300); transform: translateY(-2px); }

.brand-rail__label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--mist-400);
  margin-top: auto;
}

.brand-rail__home {
  position: relative;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  padding-top: 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.28em;
  color: var(--amber-500);
  transition: color var(--dur) var(--ease);
}
.brand-rail__home::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 50%;
  width: 8px;
  height: 8px;
  margin-left: -4px;
  border-radius: 50%;
  background: var(--amber-500);
  box-shadow: 0 0 0 4px rgba(242, 169, 59, 0.16);
  transition: box-shadow var(--dur) var(--ease);
}
.brand-rail__home:hover { color: var(--amber-300); }
.brand-rail__home:hover::before { box-shadow: 0 0 0 6px rgba(242, 169, 59, 0.24); }

/* ---------- 8. 页头 · 双层导航 ---------- */
.header-shell {
  background: rgba(9, 29, 46, 0.90);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  backdrop-filter: blur(18px) saturate(150%);
}

.header-top {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 24px);
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 11px var(--pad-x);
}

.header-brand-line {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(244, 241, 234, 0.74);
  white-space: nowrap;
}
.header-brand-line::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--amber-500);
}

.utility-nav { margin-left: auto; }
.utility-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.6vw, 22px);
}
.utility-nav__link {
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-400);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.utility-nav__link:hover,
.utility-nav__link[aria-current="page"] {
  color: var(--amber-300);
  border-bottom-color: rgba(255, 210, 122, 0.6);
}

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  padding: 5px 13px 5px 11px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(111, 175, 155, 0.34);
  background: rgba(111, 175, 155, 0.10);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--green-400);
  white-space: nowrap;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  flex: none;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  background: var(--amber-500);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.header-cta:hover { background: var(--amber-300); transform: translateY(-1px); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  border: 1px solid rgba(143, 163, 181, 0.34);
  border-radius: var(--radius-pill);
  color: var(--paper-050);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-toggle:hover {
  border-color: var(--amber-500);
  background: rgba(242, 169, 59, 0.10);
}
.nav-toggle__bars {
  position: relative;
  flex: none;
  width: 16px;
  height: 10px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: top var(--dur) var(--ease), bottom var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { bottom: 4px; transform: rotate(-45deg); }

.site-nav { border-top: var(--hairline-soft); }
.site-nav__list {
  display: flex;
  align-items: stretch;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  overflow-x: auto;
  scrollbar-width: none;
}
.site-nav__list::-webkit-scrollbar { display: none; }

.site-nav__link {
  position: relative;
  display: block;
  padding: 15px 16px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: rgba(244, 241, 234, 0.74);
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.site-nav__link::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 50%;
  width: 3px;
  height: 0;
  border-radius: 3px;
  background: var(--amber-500);
  transform: translateY(-50%);
  transition: height var(--dur) var(--ease);
}
.site-nav__link:hover {
  color: var(--white);
  background: rgba(242, 169, 59, 0.07);
}
.site-nav__link:hover::before { height: 52%; }
.site-nav__link[aria-current="page"] {
  color: var(--amber-300);
  font-weight: 700;
}
.site-nav__link[aria-current="page"]::before {
  height: 62%;
  background: var(--amber-300);
}

/* ---------- 9. 状态点与胶囊标签 ---------- */
.status-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mist-400);
  box-shadow: 0 0 0 3px rgba(143, 163, 181, 0.18);
}
.status-dot--green { background: var(--green-400); box-shadow: 0 0 0 3px rgba(111, 175, 155, 0.20); }
.status-dot--amber { background: var(--amber-500); box-shadow: 0 0 0 3px rgba(242, 169, 59, 0.20); }
.status-dot--orange { background: var(--orange-500); box-shadow: 0 0 0 3px rgba(232, 98, 44, 0.20); }
.status-dot--red { background: var(--red-600); box-shadow: 0 0 0 3px rgba(192, 68, 46, 0.22); }
.status-dot--pulse { animation: statusPulse 2.6s ease-in-out infinite; }

@keyframes statusPulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(232, 98, 44, 0.20); }
  50% { box-shadow: 0 0 0 8px rgba(232, 98, 44, 0.05); }
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  white-space: nowrap;
}
.pill--amber { color: var(--amber-300); }
.pill--green { color: var(--green-400); }
.pill--orange { color: var(--orange-500); }
.pill--red { color: var(--red-600); }
.pill--muted { color: var(--mist-400); }

/* ---------- 10. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.4;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn--primary { background: var(--amber-500); color: var(--ink-900); }
.btn--primary:hover { background: var(--amber-300); transform: translateY(-2px); }

.btn--ghost {
  border-color: rgba(242, 169, 59, 0.55);
  background: rgba(242, 169, 59, 0.06);
  color: var(--amber-300);
}
.btn--ghost:hover {
  background: rgba(242, 169, 59, 0.15);
  border-color: var(--amber-300);
  transform: translateY(-2px);
}

.btn--small { padding: 8px 17px; font-size: 13.5px; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber-300);
  transition: color var(--dur) var(--ease);
}
.link-arrow::after { content: "→"; transition: transform var(--dur) var(--ease); }
.link-arrow:hover { color: var(--amber-500); }
.link-arrow:hover::after { transform: translateX(4px); }

/* ---------- 11. 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid rgba(143, 163, 181, 0.18);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  border-color: rgba(242, 169, 59, 0.48);
  background: var(--ink-700);
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb { padding: 18px 0; }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-400);
}
.breadcrumb__link { color: var(--mist-400); transition: color var(--dur) var(--ease); }
.breadcrumb__link:hover { color: var(--amber-300); }
.breadcrumb__sep { color: rgba(143, 163, 181, 0.45); }
.breadcrumb__current { color: var(--paper-050); }

/* ---------- 13. 长文阅读区 ---------- */
.prose {
  border-radius: var(--radius-lg);
  background: var(--paper-050);
  color: var(--ink-800);
  padding: clamp(22px, 3.4vw, 42px);
  font-size: 17px;
  line-height: 1.85;
}
.prose h2, .prose h3 { color: var(--ink-900); margin-top: 1.6em; }
.prose h2:first-child, .prose h3:first-child { margin-top: 0; }
.prose p + p { margin-top: 1em; }
.prose a {
  color: var(--ink-700);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--amber-500);
}
.prose ul, .prose ol { padding-left: 1.3em; margin-top: 1em; }
.prose li + li { margin-top: 0.4em; }

/* ---------- 14. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: var(--hairline);
  background-color: var(--ink-800);
  background-image:
    linear-gradient(135deg, rgba(21, 52, 77, 0.92), rgba(12, 36, 56, 0.92)),
    repeating-linear-gradient(90deg, rgba(143, 163, 181, 0.10) 0 1px, transparent 1px 36px),
    repeating-linear-gradient(0deg, rgba(143, 163, 181, 0.10) 0 1px, transparent 1px 36px);
}
.media-frame img,
.media-frame picture,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame__tag {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(7, 26, 43, 0.82);
  border: 1px solid rgba(242, 169, 59, 0.45);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.10em;
  color: var(--amber-300);
}

/* ---------- 15. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--ink-800);
  border-top: var(--hairline);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--amber-500) 0%, var(--amber-300) 18%, rgba(242, 169, 59, 0) 58%);
}

.footer-shell {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(38px, 5.2vw, 64px) var(--pad-x) 0;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.1fr 1.5fr 1.4fr;
  gap: clamp(24px, 3.4vw, 48px);
  padding-bottom: clamp(24px, 3vw, 36px);
}

.footer-brand__mark {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--white);
}
.footer-brand__meta {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber-500);
}
.footer-brand__note {
  margin-top: 14px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist-400);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 28px);
}
.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--amber-500);
}
.footer-col__title::before {
  content: "";
  width: 12px;
  height: 1px;
  background: rgba(242, 169, 59, 0.55);
}
.footer-col__list li + li { margin-top: 2px; }
.footer-col__link {
  display: inline-block;
  padding: 5px 0;
  font-size: 14.5px;
  color: rgba(244, 241, 234, 0.76);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.footer-col__link:hover { color: var(--amber-300); transform: translateX(3px); }

.footer-sub {
  align-self: start;
  padding: 20px 22px;
  border: var(--hairline);
  border-left: 3px solid var(--amber-500);
  border-radius: var(--radius-md);
  background: var(--ink-900);
}
.footer-sub__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper-050);
}
.footer-sub__text {
  margin: 8px 0 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist-400);
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
  padding: 20px 0;
  border-top: var(--hairline-soft);
}
.footer-contact__item {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  font-size: 14px;
  color: rgba(244, 241, 234, 0.80);
  word-break: break-word;
}
.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist-400);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 18px 0 26px;
  border-top: var(--hairline-soft);
}
.footer-legal {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist-400);
}
.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}
.footer-legal__link {
  font-size: 13px;
  color: rgba(244, 241, 234, 0.72);
  transition: color var(--dur) var(--ease);
}
.footer-legal__link:hover { color: var(--amber-300); }

/* ---------- 16. 滚动进度与显现 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 130;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--amber-500), var(--orange-500));
  pointer-events: none;
}
@media (min-width: 961px) {
  .scroll-progress { left: var(--rail-w); }
}

.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 550ms var(--ease), transform 550ms var(--ease);
}
.js-reveal [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 17. 断点 ---------- */
@media (max-width: 1180px) {
  .header-status { display: none; }
}

@media (max-width: 960px) {
  .site-header { position: static; }

  .header-top {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 8px 12px;
    padding: 10px var(--pad-x);
  }
  .header-brand-line {
    grid-column: 1;
    grid-row: 1;
    white-space: normal;
    font-size: 12.5px;
    letter-spacing: 0.04em;
  }
  .nav-toggle { grid-column: 2; grid-row: 1; display: inline-flex; }
  .utility-nav { display: none; }
  .header-cta { display: none; }
  .header-status {
    display: inline-flex;
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: start;
    font-size: 11px;
  }

  .site-nav {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height 300ms var(--ease), opacity 220ms var(--ease), visibility 300ms;
  }
  .site-nav[data-open] {
    max-height: 640px;
    opacity: 1;
    visibility: visible;
  }
  .site-nav__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 12px;
  }
  .site-nav__link {
    padding: 13px 16px;
    border-top: var(--hairline-soft);
    font-size: 16px;
  }
  .site-nav__link::before { height: 0; }
  .site-nav__link[aria-current="page"]::before { height: 52%; }

  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-sub { grid-column: 1 / -1; }

  .col-4, .col-5 { grid-column: span 6; }
  .col-6, .col-7, .col-8 { grid-column: span 12; }
}

@media (max-width: 680px) {
  body { font-size: 16px; }

  .footer-top { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }

  .col-4, .col-5 { grid-column: span 12; }

  .btn { width: 100%; }
  .footer-sub .btn { width: auto; }
}

@media (max-width: 420px) {
  .footer-nav { grid-template-columns: 1fr; }
}

/* ---------- 18. 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;
  }

  .card:hover,
  .btn:hover,
  .header-cta:hover,
  .footer-col__link:hover,
  .brand-rail__mark:hover { transform: none; }

  .js-reveal [data-reveal] { opacity: 1; transform: none; }
  .status-dot--pulse { animation: none; }
}