/* ============================================================
   01 · Reset
   ============================================================ */
*,
*::before,
*::after { box-sizing: border-box; }

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

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, address { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

/* ============================================================
   02 · Tokens
   ============================================================ */
:root {
  /* 色彩 */
  --ink-deep: #081A13;
  --ink-char: #121615;
  --green-2: #173B2D;
  --green-3: #0C261C;
  --red: #FF3B30;
  --red-deep: #4A1211;
  --yellow: #E6FF3B;
  --white: #F3F7F2;
  --ice: #9BDCE8;
  --mist: #8FA99D;
  --paper: #F2E9C9;

  --line: rgba(155, 220, 232, 0.16);
  --line-strong: rgba(155, 220, 232, 0.34);
  --line-soft: rgba(155, 220, 232, 0.1);

  /* 尺寸 */
  --rail-w: clamp(212px, 18vw, 252px);
  --measure: 1280px;
  --gutter: clamp(18px, 4vw, 40px);
  --radius-lg: 26px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --radius-pill: 999px;

  /* 字体 */
  --font-display: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shadow-lift: 0 18px 38px rgba(0, 0, 0, 0.42);
  --progress: 0;
}

/* ============================================================
   03 · 中文排版与基础
   ============================================================ */
body {
  min-height: 100vh;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 0.01em;
  color: var(--white);
  background:
    radial-gradient(900px 520px at 90% -10%, rgba(230, 255, 59, 0.07), transparent 62%),
    radial-gradient(760px 500px at 0% 2%, rgba(155, 220, 232, 0.06), transparent 60%),
    var(--ink-deep);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--white);
}
h1 { font-size: clamp(2rem, 4.4vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 2.8vw, 2.2rem); }
h3 { font-size: clamp(1.15rem, 1.9vw, 1.5rem); }
h4 { font-size: 1.05rem; letter-spacing: 0; }

p { max-width: 68ch; }
strong { font-weight: 700; color: var(--white); }

a { color: var(--ice); transition: color 0.16s ease; }
a:hover { color: var(--white); }

::selection { background: var(--yellow); color: #08120E; }

:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
  border-radius: 6px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   04 · 容器与布局骨架
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(40px, 6vw, 84px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 20px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.section-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--yellow);
  padding: 4px 12px;
  border: 1px solid rgba(230, 255, 59, 0.32);
  border-radius: var(--radius-pill);
  background: rgba(230, 255, 59, 0.07);
}

.section-title { font-size: clamp(1.35rem, 2.4vw, 1.9rem); }

.section-lead {
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 60ch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ice);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--yellow);
}

.split { display: grid; gap: clamp(20px, 3vw, 40px); grid-template-columns: minmax(0, 1fr); }
.split-aside { min-width: 0; }
.split-main { min-width: 0; }

@media (min-width: 900px) {
  .split { grid-template-columns: minmax(0, 4fr) minmax(0, 12fr); align-items: start; }
}

.divider {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 48px);
  background: linear-gradient(90deg, var(--line-strong), transparent 82%);
}

.stack > * + * { margin-top: 14px; }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

/* ============================================================
   05 · 按钮 / 胶囊 / 筛选
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: transform 0.18s ease, background-color 0.18s ease,
              border-color 0.18s ease, box-shadow 0.18s ease, color 0.18s ease;
}

.btn--primary {
  background: var(--yellow);
  color: #0A1A12;
  box-shadow: 0 10px 24px rgba(230, 255, 59, 0.16);
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: #F2FF74;
  color: #0A1A12;
  transform: translateY(-3px);
}

.btn--ghost {
  border-color: var(--line-strong);
  background: rgba(155, 220, 232, 0.05);
  color: var(--white);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--ice);
  color: var(--ice);
  transform: translateY(-3px);
}

.btn--signal {
  background: var(--red);
  color: #FFF6F5;
  box-shadow: 0 10px 24px rgba(255, 59, 48, 0.2);
}
.btn--signal:hover,
.btn--signal:focus-visible {
  background: #FF5449;
  color: #FFF6F5;
  transform: translateY(-3px);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(243, 247, 242, 0.03);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  line-height: 1.6;
}
.pill--yellow {
  color: var(--yellow);
  border-color: rgba(230, 255, 59, 0.36);
  background: rgba(230, 255, 59, 0.08);
}
.pill--red {
  color: #FFD9D6;
  border-color: rgba(255, 59, 48, 0.5);
  background: var(--red-deep);
}
.pill--ice {
  color: var(--ice);
  border-color: rgba(155, 220, 232, 0.4);
  background: rgba(155, 220, 232, 0.08);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(18, 22, 21, 0.7);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: transform 0.16s ease, color 0.16s ease,
              border-color 0.16s ease, background-color 0.16s ease;
}
.chip:hover {
  color: var(--ice);
  border-color: var(--line-strong);
  transform: translateY(-2px);
}
.chip[aria-pressed="true"] {
  background: var(--yellow);
  border-color: var(--yellow);
  color: #0A1A12;
  font-weight: 600;
}

/* ============================================================
   06 · 面包屑
   ============================================================ */
.breadcrumb { padding-block: 20px 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);
}
.breadcrumb-item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: rgba(143, 169, 157, 0.45);
}
.breadcrumb-link { color: var(--mist); }
.breadcrumb-link:hover { color: var(--ice); }
.breadcrumb-item[aria-current="page"] { color: var(--yellow); }

/* ============================================================
   07 · 卡片 / 图像容器 / 时间轴
   ============================================================ */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(23, 59, 45, 0.58), rgba(18, 22, 21, 0.92));
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.card:hover,
.card:focus-within {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-lift);
}

.card-grid {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 720px) {
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1100px) {
  .card-grid--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.media {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(150deg, var(--green-2), var(--ink-char) 70%),
    var(--ink-char);
}
.media::after {
  content: "";
  position: absolute;
  inset: auto -10% -42% -10%;
  height: 62%;
  background: linear-gradient(180deg, transparent, rgba(8, 26, 19, 0.88));
  pointer-events: none;
  z-index: 1;
}
.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media--hero { aspect-ratio: 16 / 10; }
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 4 / 5; }
.media--clip { clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 94%); }

.media-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  padding: 4px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: rgba(8, 26, 19, 0.8);
  color: var(--ice);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.timeline {
  position: relative;
  display: grid;
  gap: 18px;
  padding-left: 26px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--yellow), rgba(155, 220, 232, 0.18));
}
.timeline-item { position: relative; }
.timeline-dot {
  position: absolute;
  left: -26px;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: 0 0 0 4px rgba(230, 255, 59, 0.14);
}
.timeline-item--alert .timeline-dot {
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(255, 59, 48, 0.16);
}
.timeline-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* ============================================================
   08 · Skip link
   ============================================================ */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--yellow);
  color: #08120E;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  transform: translateY(-180%);
  transition: transform 0.18s ease;
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  color: #08120E;
}

/* ============================================================
   09 · 框架式头部（移动端：顶部横条 + 抽屉）
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  color: var(--white);
  background: rgba(18, 22, 21, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-rail {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  padding: 12px 20px 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
}
.brand:hover { color: var(--white); }
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--yellow);
  color: var(--ink-deep);
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  box-shadow: inset -3px -3px 0 rgba(8, 26, 19, 0.18);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 17px; font-weight: 800; letter-spacing: 0.01em; }
.brand-line {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 10px;
  border: 1px solid rgba(230, 255, 59, 0.34);
  border-radius: var(--radius-pill);
  background: rgba(230, 255, 59, 0.08);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  line-height: 1.6;
}
.version-label { color: var(--mist); }
.version-code { color: var(--yellow); font-weight: 700; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 16px;
  border: 1px solid rgba(155, 220, 232, 0.3);
  border-radius: var(--radius-pill);
  background: rgba(155, 220, 232, 0.08);
  color: var(--ice);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}
.nav-toggle:hover {
  background: rgba(155, 220, 232, 0.16);
  border-color: var(--ice);
  color: var(--white);
}
.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}
.nav-toggle-bars > span {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.site-header[data-open] .nav-toggle-bars > span:first-child {
  transform: translateY(3px) rotate(45deg);
}
.site-header[data-open] .nav-toggle-bars > span:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

.primary-nav {
  display: none;
  flex-basis: 100%;
  min-width: 0;
}
.site-header[data-open] .primary-nav { display: block; }

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: 6px;
}
.nav-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--white);
  font-size: 15px;
  font-weight: 500;
  transition: background-color 0.16s ease, color 0.16s ease, transform 0.16s ease;
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
  transition: color 0.16s ease;
}
.nav-label { line-height: 1.5; }
.nav-link:hover {
  background: rgba(155, 220, 232, 0.09);
  color: var(--ice);
  transform: translateX(4px);
}
.nav-link:hover .nav-index { color: var(--ice); }
.nav-link[aria-current="page"] {
  background: rgba(230, 255, 59, 0.1);
  color: var(--yellow);
  box-shadow: inset 2px 0 0 var(--yellow);
}
.nav-link[aria-current="page"] .nav-index { color: var(--yellow); }

.rail-utility {
  display: none;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 10px;
}
.site-header[data-open] .rail-utility { display: flex; }
.rail-utility a {
  padding: 5px 12px;
  border: 1px solid rgba(143, 169, 157, 0.28);
  border-radius: var(--radius-pill);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  transition: color 0.16s ease, border-color 0.16s ease;
}
.rail-utility a:hover {
  color: var(--ice);
  border-color: rgba(155, 220, 232, 0.55);
}

.rail-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(155, 220, 232, 0.12);
  pointer-events: none;
}
.rail-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--yellow), var(--ice));
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
  transition: transform 0.12s linear;
}

/* 桌面 · 框架式左栏 */
@media (min-width: 960px) {
  body { padding-left: var(--rail-w); }

  .site-header {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--rail-w);
    height: 100vh;
    border-bottom: 0;
    border-right: 1px solid var(--line);
    background: linear-gradient(180deg, #121615 0%, #0C2118 52%, #081A13 100%);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .site-header::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 190px;
    background: radial-gradient(120% 100% at 0% 100%, rgba(230, 255, 59, 0.13), transparent 68%);
    pointer-events: none;
  }

  .header-rail {
    position: relative;
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 0;
    height: 100%;
    padding: 28px 20px 26px;
    z-index: 1;
  }

  .brand { align-self: flex-start; }
  .version-badge { align-self: flex-start; margin-top: 20px; }
  .nav-toggle { display: none; }

  .primary-nav {
    display: block;
    flex: 1 1 auto;
    margin-top: 26px;
    overflow-y: auto;
    overscroll-behavior: contain;
  }
  .nav-list { padding-top: 0; }
  .nav-link { padding: 9px 12px; }

  .rail-utility {
    display: flex;
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--line-soft);
  }

  .rail-progress {
    left: auto;
    right: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    height: auto;
  }
  .rail-progress-bar {
    transform: scaleY(var(--progress, 0));
    transform-origin: top center;
    background: linear-gradient(180deg, var(--yellow), var(--ice));
  }
}

/* ============================================================
   10 · 页脚
   ============================================================ */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(48px, 8vw, 96px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, #0A1F17 0%, #121615 58%, #07120E 100%);
  color: var(--white);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 46%;
  height: 100%;
  background: linear-gradient(212deg, rgba(23, 59, 45, 0.55), transparent 62%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.footer-ruler {
  height: 10px;
  background-image: repeating-linear-gradient(90deg, rgba(155, 220, 232, 0.3) 0 1px, transparent 1px 26px);
  border-bottom: 1px solid var(--line-soft);
}

.footer-inner { position: relative; z-index: 1; }

.footer-grid {
  display: grid;
  gap: clamp(24px, 3vw, 44px);
  grid-template-columns: minmax(0, 1fr);
  padding-block: clamp(34px, 5vw, 60px) clamp(24px, 3vw, 40px);
}
@media (min-width: 760px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1060px) {
  .footer-grid { grid-template-columns: 1.4fr 0.8fr 0.8fr 1.25fr; }
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--white);
}
.footer-logo::before {
  content: "";
  width: 6px;
  height: 22px;
  border-radius: 3px;
  background: var(--yellow);
}
.footer-logo:hover { color: var(--yellow); }

.footer-tagline {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--yellow);
}
.footer-note {
  margin-top: 12px;
  max-width: 32ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}
.footer-note--small { font-size: 13px; max-width: 34ch; }

.footer-build {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
  padding: 6px 14px;
  border: 1px dashed rgba(155, 220, 232, 0.3);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
}
.footer-build-key { color: var(--mist); }
.footer-build-code { color: var(--ice); font-weight: 700; }

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--ice);
}

.footer-list { display: grid; gap: 10px; }
.footer-list a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 15px;
  color: var(--mist);
  transition: color 0.16s ease, transform 0.16s ease;
}
.footer-list a::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line-strong);
  transition: background-color 0.16s ease;
}
.footer-list a:hover {
  color: var(--white);
  transform: translateX(4px);
}
.footer-list a:hover::before { background: var(--yellow); }

.contact-list { display: grid; gap: 10px; }
.contact-row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  align-items: start;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(155, 220, 232, 0.14);
}
.contact-key {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}
.contact-value {
  font-size: 14px;
  line-height: 1.6;
  color: var(--white);
  word-break: break-all;
}
.copy-btn {
  padding: 4px 12px;
  border: 1px solid rgba(155, 220, 232, 0.28);
  border-radius: var(--radius-pill);
  background: rgba(155, 220, 232, 0.06);
  color: var(--ice);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}
.copy-btn:hover {
  color: var(--white);
  border-color: var(--ice);
  background: rgba(155, 220, 232, 0.16);
}
.copy-btn[data-copied] {
  color: #0A1A12;
  background: var(--yellow);
  border-color: var(--yellow);
}

.footer-address {
  margin-top: 16px;
  font-style: normal;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  padding-block: 18px 26px;
  border-top: 1px solid rgba(155, 220, 232, 0.12);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.footer-legal-meta { max-width: none; }
.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-left: auto;
}
.footer-legal-links a { color: var(--mist); }
.footer-legal-links a:hover { color: var(--yellow); }

@media (max-width: 620px) {
  .footer-legal-links { margin-left: 0; }
}

/* ============================================================
   11 · 动效降级
   ============================================================ */
@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,
  .card:focus-within,
  .footer-list a:hover,
  .nav-link:hover,
  .btn:hover,
  .chip:hover {
    transform: none;
  }
  .skip-link { transition: none; }
}