/* ============================================================
   优发国际址 · 共享站点样式  /assets/site.css
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --navy-900: #0E1B2C;
  --navy-800: #16263B;
  --orange-500: #FF6A2B;
  --orange-200: #FFD9C2;
  --jade-500: #2FA98C;
  --silver-400: #C7CDD6;
  --silver-100: #EEF1F5;
  --paper-100: #F6F2E9;
  --gold-400: #C8A26A;
  --ink-900: #0A1520;

  --c-text: var(--ink-900);
  --c-text-muted: rgba(10, 21, 32, .64);
  --c-text-inv: #E9EEF5;
  --c-text-inv-muted: rgba(233, 238, 245, .68);

  --line-strong: rgba(10, 21, 32, .16);
  --line-soft: rgba(10, 21, 32, .09);
  --line-inv: rgba(199, 205, 214, .28);
  --line-inv-soft: rgba(199, 205, 214, .13);

  --shadow-1: 0 1px 2px rgba(14, 27, 44, .06);
  --shadow-2: 0 1px 2px rgba(14, 27, 44, .06), 0 18px 36px -30px rgba(14, 27, 44, .6);
  --shadow-float: 0 26px 60px -34px rgba(14, 27, 44, .95);

  --r-xs: 4px;
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 28px;
  --r-pill: 999px;

  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans CJK SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Mono", "Roboto Mono", Menlo, Consolas, "Courier New", monospace;

  --shell-w: 1200px;
  --gutter: 24px;
  --band-y: 96px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

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

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, hr { margin: 0; }

ul[class],
ol[class] { list-style: none; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
  background: #FFFFFF;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: inherit; }

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

h1, h2, h3, h4 {
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -.02em;
}

strong, b { font-weight: 800; }

#main-content { scroll-margin-top: 110px; }

/* ---------- 3. 无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--orange-500);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: 10px;
  left: 50%;
  z-index: 300;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  background: var(--orange-500);
  color: var(--navy-900);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  transform: translate(-50%, -220%);
  transition: transform .22s var(--ease);
  pointer-events: auto;
}
.skip-link:focus { transform: translate(-50%, 0); }

/* ---------- 4. 布局外壳 ---------- */
.shell {
  width: min(calc(100% - var(--gutter) * 2), var(--shell-w));
  margin-inline: auto;
}

.band {
  position: relative;
  padding: var(--band-y) 0;
}
.band--dark {
  background: var(--navy-900);
  color: var(--c-text-inv);
}
.band--silver { background: var(--silver-100); }
.band--paper { background: var(--paper-100); }

.grid {
  display: grid;
  gap: 24px;
}
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.span-1 { grid-column: span 1; }
.span-2 { grid-column: span 2; }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-10 { grid-column: span 10; }
.span-11 { grid-column: span 11; }
.span-12 { grid-column: span 12; }

/* ---------- 5. 通用排版 ---------- */
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .08em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orange-500);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}
.band--dark .eyebrow { color: var(--orange-500); }

.section-title {
  font-size: clamp(28px, 3.6vw, 44px);
  letter-spacing: -.02em;
}

.display-title {
  font-size: clamp(52px, 8.4vw, 96px);
  line-height: .95;
  letter-spacing: -.03em;
  font-weight: 900;
}

.lead {
  font-size: clamp(17px, 1.4vw, 19px);
  line-height: 1.8;
  color: var(--c-text-muted);
}
.band--dark .lead { color: var(--c-text-inv-muted); }

.prose {
  max-width: 38em;
  line-height: 1.85;
}
.prose > * + * { margin-top: 1.1em; }
.prose h3 { font-size: 21px; margin-top: 1.8em; }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: .74em 1.4em;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease), transform .2s var(--ease);
}
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--orange-500);
  color: var(--navy-900);
  box-shadow: 0 12px 26px -18px rgba(255, 106, 43, .95);
}
.btn--primary:hover { background: #FF8347; }

.btn--ghost {
  border-color: var(--line-inv);
  color: var(--c-text-inv);
  background: transparent;
}
.btn--ghost:hover {
  border-color: var(--orange-500);
  color: var(--orange-500);
}

.btn--outline {
  border-color: var(--line-strong);
  color: var(--ink-900);
  background: transparent;
}
.btn--outline:hover {
  border-color: var(--orange-500);
  color: var(--orange-500);
}

.btn--sm { padding: .58em 1.1em; font-size: 13.5px; }
.btn--lg { padding: .9em 1.9em; font-size: 16.5px; }

/* ---------- 7. 标签 / 状态 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  padding: .38em .85em;
  border: 1px solid var(--line-inv);
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--c-text-inv-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease);
}
.chip:hover { border-color: var(--silver-400); color: var(--c-text-inv); }
.chip[aria-pressed="true"] {
  background: var(--orange-200);
  border-color: transparent;
  color: #8A2F00;
}

.tag-pass {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  padding: .22em .7em;
  border-radius: var(--r-pill);
  background: rgba(47, 169, 140, .14);
  color: #1C7A64;
  font-size: 12.5px;
  font-weight: 700;
}
.tag-pass::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--jade-500);
}

/* ---------- 8. 卡片 ---------- */
.card {
  background: #FFFFFF;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-1);
  padding: 24px;
}
.card--dark {
  background: var(--navy-800);
  border-color: var(--line-inv-soft);
  color: var(--c-text-inv);
}
.card--paper {
  background: var(--paper-100);
  border-color: rgba(200, 162, 106, .3);
}

/* ---------- 9. 数字锚点 ---------- */
.stat {
  display: grid;
  gap: 6px;
  align-content: start;
}
.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(36px, 4.6vw, 64px);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1;
  color: var(--orange-500);
}
.band--dark .stat__value { color: var(--orange-500); }
.stat__label {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-text-muted);
}
.band--dark .stat__label { color: var(--c-text-inv-muted); }

/* ---------- 10. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--c-text-muted);
}
.crumbs li { display: flex; align-items: center; }
.crumbs li + li::before {
  content: "/";
  margin: 0 .7em;
  opacity: .45;
}
.crumbs a {
  text-decoration: none;
  transition: color .2s var(--ease);
}
.crumbs a:hover { color: var(--orange-500); }
.band--dark .crumbs { color: var(--c-text-inv-muted); }

/* ---------- 11. 图片容器基类 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-md);
  background: var(--navy-800);
  aspect-ratio: 16 / 10;
}
.media::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(199, 205, 214, .1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(199, 205, 214, .1) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}
.media > img,
.media > svg {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 18px;
  background: linear-gradient(to top, rgba(14, 27, 44, .92), rgba(14, 27, 44, 0));
  color: var(--c-text-inv);
  font-size: 13.5px;
  letter-spacing: .04em;
}

/* ---------- 12. 侧栏目录 ---------- */
.toc {
  display: grid;
  gap: 2px;
  align-content: start;
}
.toc__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: 10px;
}
.toc a {
  position: relative;
  display: block;
  padding: 8px 0 8px 18px;
  font-size: 14px;
  color: var(--c-text-muted);
  text-decoration: none;
  border-left: 1px solid var(--line-soft);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.toc a::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--orange-500);
  transform: translateY(-50%);
  transition: height .22s var(--ease);
}
.toc a:hover { color: var(--ink-900); }
.toc a[aria-current="true"] {
  color: var(--orange-500);
  font-weight: 700;
  border-color: rgba(255, 106, 43, .35);
}
.toc a[aria-current="true"]::before { height: 20px; }

/* ---------- 13. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  padding: 12px 0;
  pointer-events: none;
}

.nav-island,
.site-header .skip-link { pointer-events: auto; }

.nav-island {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 9px 10px 9px 16px;
  border: 1px solid rgba(199, 205, 214, .16);
  border-radius: var(--r-pill);
  background: rgba(14, 27, 44, .9);
  box-shadow: var(--shadow-float), inset 0 1px 0 rgba(255, 255, 255, .05);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  padding-right: 6px;
  color: #FFFFFF;
  text-decoration: none;
}
.brand__mark {
  position: relative;
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--orange-500);
  box-shadow: inset 0 0 0 1px rgba(14, 27, 44, .18);
}
.brand__mark::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 2px solid var(--navy-900);
  border-radius: 2px;
}
.brand__text {
  display: grid;
  gap: 1px;
}
.brand__name {
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.15;
}
.brand__line {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  line-height: 1.3;
  color: rgba(199, 205, 214, .6);
  white-space: nowrap;
}

/* 导航 */
.nav__list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
}
.nav__link {
  position: relative;
  display: block;
  padding: 9px 13px;
  border-radius: var(--r-pill);
  font-size: 14.5px;
  font-weight: 500;
  color: rgba(199, 205, 214, .86);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), background-color .2s var(--ease);
}
.nav__link:hover {
  color: #FFFFFF;
  background: rgba(199, 205, 214, .1);
}
.nav__link[aria-current="page"] {
  color: #FFFFFF;
  background: rgba(255, 106, 43, .16);
  font-weight: 700;
}
.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--orange-500);
  transform: translateX(-50%);
}

/* 动作区 */
.nav-side {
  display: flex;
  align-items: center;
  gap: 10px;
}
.batch-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px 7px 11px;
  border: 1px solid var(--line-inv-soft);
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, .04);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: rgba(233, 238, 245, .86);
  white-space: nowrap;
}
.batch-pill__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jade-500);
  box-shadow: 0 0 0 3px rgba(47, 169, 140, .18);
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid var(--line-inv);
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, .05);
  color: #FFFFFF;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .25s var(--ease);
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(3px) rotate(45deg);
}
.site-header[data-open] .nav-toggle__bars span:nth-child(2) {
  transform: translateY(-3px) rotate(-45deg);
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: 96px;
  background: var(--navy-900);
  color: var(--c-text-inv);
  border-top: 1px solid var(--line-inv-soft);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(199, 205, 214, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(199, 205, 214, .05) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 90% at 82% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 90% at 82% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}
.site-footer > .shell { position: relative; z-index: 1; }

.footer-watermark {
  position: absolute;
  right: -10px;
  bottom: 96px;
  z-index: 0;
  font-size: clamp(120px, 20vw, 260px);
  font-weight: 700;
  line-height: .8;
  color: rgba(199, 205, 214, .06);
  pointer-events: none;
  user-select: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.7fr) repeat(4, minmax(120px, 1fr));
  gap: 44px 32px;
  padding: 72px 0 52px;
}

.footer-brand__name {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -.02em;
  color: #FFFFFF;
}
.footer-brand__line {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--orange-500);
}
.footer-brand__desc {
  margin-top: 18px;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(199, 205, 214, .7);
}

.footer-group__title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: rgba(199, 205, 214, .55);
}
.footer-group__title::before {
  content: "";
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--orange-500);
}
.footer-group__list {
  display: grid;
  gap: 11px;
}
.footer-group__link {
  font-size: 14.5px;
  color: rgba(233, 238, 245, .82);
  text-decoration: none;
  transition: color .2s var(--ease);
}
.footer-group__link:hover { color: var(--orange-500); }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 26px 32px;
  padding: 38px 0;
  border-top: 1px solid var(--line-inv-soft);
  border-bottom: 1px solid var(--line-inv-soft);
}
.footer-contact__item {
  display: grid;
  gap: 7px;
  align-content: start;
}
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: rgba(199, 205, 214, .5);
}
.footer-contact__value {
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(233, 238, 245, .9);
  overflow-wrap: anywhere;
}
.footer-contact__note {
  grid-column: 1 / -1;
  max-width: 64em;
  font-size: 13px;
  line-height: 1.85;
  color: rgba(199, 205, 214, .58);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
  padding: 26px 0 34px;
  font-size: 12.5px;
  color: rgba(199, 205, 214, .5);
}
.footer-base__legal { color: rgba(199, 205, 214, .68); }
.footer-base__sign { margin-left: auto; }

/* ---------- 15. 滚动进度与返回顶部 ---------- */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 200;
  height: 2px;
  background: linear-gradient(90deg, var(--orange-500), var(--jade-500));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  will-change: transform;
}

.to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 150;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line-inv);
  border-radius: var(--r-pill);
  background: rgba(14, 27, 44, .92);
  color: var(--c-text-inv);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  box-shadow: var(--shadow-float);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: opacity .24s var(--ease), transform .24s var(--ease),
              visibility .24s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease);
}
.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.to-top span {
  width: 11px;
  height: 11px;
  border-left: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: translateY(3px) rotate(45deg);
}
.to-top:hover {
  color: var(--orange-500);
  border-color: var(--orange-500);
}

/* ---------- 16. 显现动画 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .32s ease-out, transform .32s ease-out;
}
.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1079px) {
  :root { --gutter: 20px; }

  .nav-island {
    grid-template-columns: auto auto;
    justify-content: space-between;
    gap: 10px;
    padding: 8px 8px 8px 14px;
    background: rgba(14, 27, 44, .97);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .nav-side { display: none; }
  .nav-toggle { display: inline-flex; }

  .nav {
    position: fixed;
    left: 16px;
    right: 16px;
    bottom: 16px;
    z-index: 220;
    max-height: min(72vh, 560px);
    overflow-y: auto;
    padding: 14px;
    border: 1px solid var(--line-inv);
    border-radius: var(--r-xl);
    background: var(--navy-800);
    box-shadow: 0 34px 70px -30px rgba(0, 0, 0, .85);
    opacity: 0;
    visibility: hidden;
    transform: translateY(14px);
    transition: opacity .24s var(--ease), transform .24s var(--ease),
                visibility .24s var(--ease);
  }
  .site-header[data-open] .nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .nav__link {
    padding: 14px 16px;
    border-radius: var(--r-md);
    font-size: 16px;
    color: var(--c-text-inv);
  }
  .nav__link[aria-current="page"] { background: rgba(255, 106, 43, .18); }
  .nav__link[aria-current="page"]::after { display: none; }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 36px 28px;
    padding: 56px 0 40px;
  }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .span-1, .span-2, .span-3,
  .span-4, .span-5, .span-6,
  .span-7, .span-8, .span-9,
  .span-10, .span-11 {
    grid-column: 1 / -1;
  }
}

@media (max-width: 720px) {
  :root { --gutter: 16px; --band-y: 64px; }
  body { font-size: 16px; }

  .site-header { padding: 8px 0; }
  .nav-island { padding: 7px 7px 7px 12px; }
  .brand__mark { width: 28px; height: 28px; }
  .brand__mark::after { inset: 8px; }
  .brand__name { font-size: 15.5px; }
  .brand__line { display: none; }

  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 10px; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-contact { grid-template-columns: 1fr; gap: 22px; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .footer-base__sign { margin-left: 0; }
  .footer-watermark { bottom: 140px; }

  .to-top { right: 14px; bottom: 14px; }
}

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

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