/* =========================================================
   星空赛场 · 共享样式  /assets/site.css
   深空墨蓝为底 / 左右分屏骨架 / 双层信息导航
   ========================================================= */

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

/* ---------- 2. design tokens ---------- */
:root {
  --sk-ink: #070B1A;
  --sk-ink-2: #0E1630;
  --sk-rock: #2A3446;
  --sk-mist: #6C7A90;
  --sk-star: #F2EDE3;
  --sk-moss: #35D3A6;
  --sk-cyan: #7BE7FF;
  --sk-violet: #8A6BFF;
  --sk-clay: #E1703C;
  --sk-moss-deep: #123B36;
  --sk-star-dim: #C9D3E0;

  --sk-font-display: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --sk-font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --sk-font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Noto Sans Mono CJK SC", monospace;

  --sk-max: 1440px;
  --sk-gutter: clamp(16px, 4vw, 44px);
  --sk-radius-l: 28px;
  --sk-radius-m: 18px;
  --sk-radius-s: 12px;
  --sk-capsule: 999px;

  --sk-topbar-h: 46px;
  --sk-navbar-h: 60px;
  --sk-sticky: 122px;

  --sk-ease: cubic-bezier(.22, .68, .35, 1);
  --sk-hair: 1px solid rgba(42, 52, 70, .9);
}

/* ---------- 3. base & 中文排版 ---------- */
html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  font-family: var(--sk-font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--sk-star-dim);
  background-color: var(--sk-ink);
  background-image:
    radial-gradient(1100px 640px at 82% -8%, rgba(138, 107, 255, .20), transparent 62%),
    radial-gradient(920px 520px at 4% 6%, rgba(53, 211, 166, .13), transparent 64%),
    radial-gradient(780px 460px at 56% 92%, rgba(123, 231, 255, .09), transparent 62%);
  background-attachment: fixed;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: radial-gradient(rgba(242, 237, 227, .085) 1px, transparent 1.4px);
  background-size: 38px 38px;
  opacity: .65;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), rgba(0, 0, 0, .12));
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), rgba(0, 0, 0, .12));
}

h1, h2, h3, h4 {
  font-family: var(--sk-font-display);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--sk-star);
}

::selection { background: var(--sk-moss); color: #04231d; }

:focus-visible {
  outline: 2px solid var(--sk-cyan);
  outline-offset: 3px;
  border-radius: 8px;
}

/* ---------- 4. 布局骨架 ---------- */
.sk-wrap {
  width: 100%;
  max-width: var(--sk-max);
  margin: 0 auto;
  padding-inline: var(--sk-gutter);
}

.sk-main {
  position: relative;
  z-index: 1;
  display: block;
  padding-block: clamp(28px, 5vw, 62px) clamp(56px, 8vw, 104px);
}

.sk-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 52px);
  align-items: start;
}

.sk-rail { min-width: 0; }

@media (min-width: 1000px) {
  .sk-split { grid-template-columns: minmax(230px, 25%) minmax(0, 1fr); }
  .sk-split--rail-right { grid-template-columns: minmax(0, 1fr) minmax(230px, 25%); }
  .sk-split--even { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .sk-rail { position: sticky; top: var(--sk-sticky); }
}

.sk-section {
  padding-block: clamp(28px, 4vw, 50px);
  border-top: var(--sk-hair);
}
.sk-section:first-child { border-top: 0; padding-top: 0; }
.sk-section:last-child { padding-bottom: 0; }

.sk-rule {
  height: 1px;
  border: 0;
  margin: clamp(28px, 4vw, 46px) 0;
  background: linear-gradient(90deg, rgba(53, 211, 166, .6), rgba(42, 52, 70, .85) 42%, transparent);
}

.sk-grid { display: grid; gap: clamp(16px, 2vw, 26px); }
.sk-grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.sk-grid--3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.sk-grid--4 { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }

/* ---------- 5. 文字工具 ---------- */
.sk-mono { font-family: var(--sk-font-mono); letter-spacing: .08em; }

.sk-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--sk-font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--sk-moss);
}
.sk-eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  flex: none;
  background: linear-gradient(90deg, var(--sk-moss), transparent);
}

.sk-display {
  font-family: var(--sk-font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 7vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -.03em;
  color: var(--sk-star);
}

.sk-h2 { font-size: clamp(1.55rem, 3vw, 2.35rem); letter-spacing: -.02em; }
.sk-h3 { font-size: clamp(1.12rem, 1.7vw, 1.38rem); }

.sk-lead {
  max-width: 62ch;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.9;
  color: var(--sk-star-dim);
}

.sk-note {
  font-family: var(--sk-font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--sk-mist);
}

.sk-text { max-width: 68ch; }
.sk-text p { margin-bottom: 1.15em; }
.sk-text p:last-child { margin-bottom: 0; }
.sk-text strong { color: var(--sk-star); }
.sk-text a {
  color: var(--sk-cyan);
  border-bottom: 1px solid rgba(123, 231, 255, .45);
  transition: border-color .2s var(--sk-ease), color .2s var(--sk-ease);
}
.sk-text a:hover { color: var(--sk-star); border-bottom-color: var(--sk-moss); }

/* ---------- 6. 通用按钮 ---------- */
.sk-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: var(--sk-capsule);
  font-family: var(--sk-font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  cursor: pointer;
  transition: transform .24s var(--sk-ease), box-shadow .24s var(--sk-ease),
              background-color .24s var(--sk-ease), color .24s var(--sk-ease),
              border-color .24s var(--sk-ease);
}

.sk-btn--primary {
  background: linear-gradient(120deg, var(--sk-clay), #F09355);
  color: #2C1004;
  box-shadow: 0 12px 30px -14px rgba(225, 112, 60, .9);
}
.sk-btn--primary:hover { transform: translateY(-2px); box-shadow: 0 20px 40px -16px rgba(225, 112, 60, 1); }

.sk-btn--ghost {
  background: rgba(14, 22, 48, .62);
  border-color: var(--sk-rock);
  color: var(--sk-star);
}
.sk-btn--ghost:hover {
  border-color: var(--sk-moss);
  color: var(--sk-moss);
  background: rgba(53, 211, 166, .09);
  transform: translateY(-2px);
}

.sk-btn--quiet {
  padding: 6px 0;
  border-radius: 6px;
  color: var(--sk-cyan);
  font-weight: 600;
}
.sk-btn--quiet:hover { color: var(--sk-star); }

/* ---------- 7. 面包屑 ---------- */
.sk-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-family: var(--sk-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sk-mist);
}
.sk-crumbs li { display: flex; align-items: center; gap: 8px; }
.sk-crumbs li + li::before { content: "/"; color: var(--sk-rock); }
.sk-crumbs a { transition: color .2s var(--sk-ease); }
.sk-crumbs a:hover { color: var(--sk-cyan); }
.sk-crumbs [aria-current="page"] { color: var(--sk-star-dim); }

/* ---------- 8. 卡片 / 索引 / 数据 ---------- */
.sk-card {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  border: var(--sk-hair);
  border-radius: var(--sk-radius-l);
  background: linear-gradient(160deg, rgba(14, 22, 48, .94), rgba(7, 11, 26, .88));
  transition: border-color .25s var(--sk-ease), transform .25s var(--sk-ease), box-shadow .25s var(--sk-ease);
}
.sk-card:hover {
  border-color: rgba(53, 211, 166, .55);
  transform: translateY(-3px);
  box-shadow: 0 28px 52px -34px rgba(53, 211, 166, .75);
}

.sk-index { display: flex; flex-direction: column; }
.sk-index__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 16px 6px;
  border-bottom: 1px dashed rgba(42, 52, 70, .95);
  transition: background-color .22s var(--sk-ease), border-color .22s var(--sk-ease);
}
.sk-index__item:hover {
  border-bottom-color: rgba(53, 211, 166, .6);
  background: linear-gradient(90deg, rgba(53, 211, 166, .09), transparent);
}
.sk-index__num {
  font-family: var(--sk-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--sk-moss);
}
.sk-index__title { font-size: 1.04rem; font-weight: 700; color: var(--sk-star); }
.sk-index__meta {
  font-family: var(--sk-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sk-mist);
  white-space: nowrap;
}

.sk-stat { display: flex; flex-direction: column; gap: 6px; }
.sk-stat__num {
  font-family: var(--sk-font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--sk-cyan);
}
.sk-stat__label {
  font-family: var(--sk-font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--sk-mist);
}

.sk-panel {
  padding: clamp(20px, 2.4vw, 30px);
  border: 1px solid rgba(53, 211, 166, .32);
  border-radius: var(--sk-radius-l);
  background: linear-gradient(150deg, rgba(18, 59, 54, .58), rgba(14, 22, 48, .92));
  box-shadow: 0 32px 64px -44px rgba(53, 211, 166, .8);
}

/* ---------- 9. 时间轴（更新日志） ---------- */
.sk-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding-left: 26px;
}
.sk-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--sk-moss), rgba(42, 52, 70, .9) 62%, transparent);
}
.sk-timeline__item { position: relative; }
.sk-timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--sk-ink);
  border: 2px solid var(--sk-clay);
  box-shadow: 0 0 0 4px rgba(225, 112, 60, .16);
}
.sk-timeline__item--moss::before {
  border-color: var(--sk-moss);
  box-shadow: 0 0 0 4px rgba(53, 211, 166, .16);
}
.sk-timeline__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--sk-font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--sk-mist);
}

/* ---------- 10. 章节目录 ---------- */
.sk-toc { display: flex; flex-direction: column; gap: 3px; }
.sk-toc a {
  display: block;
  padding: 8px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--sk-radius-s) var(--sk-radius-s) 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--sk-mist);
  transition: color .2s var(--sk-ease), background-color .2s var(--sk-ease), border-color .2s var(--sk-ease);
}
.sk-toc a:hover { color: var(--sk-star); background: rgba(53, 211, 166, .07); }
.sk-toc a.is-active {
  color: var(--sk-moss);
  border-left-color: var(--sk-moss);
  background: rgba(53, 211, 166, .09);
}

/* ---------- 11. 标签胶囊 ---------- */
.sk-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid rgba(53, 211, 166, .3);
  border-radius: var(--sk-capsule);
  background: rgba(18, 59, 54, .72);
  color: var(--sk-moss);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  transition: background-color .22s var(--sk-ease), border-color .22s var(--sk-ease), color .22s var(--sk-ease);
}
.sk-tag:hover {
  background: rgba(53, 211, 166, .2);
  border-color: var(--sk-moss);
  color: var(--sk-star);
}
.sk-tag--violet {
  background: rgba(138, 107, 255, .16);
  border-color: rgba(138, 107, 255, .38);
  color: #C6BAFF;
}
.sk-tag--violet:hover {
  background: rgba(138, 107, 255, .28);
  border-color: var(--sk-violet);
  color: var(--sk-star);
}
.sk-tag--sm { padding: 5px 12px; font-size: 12px; }

/* ---------- 12. 图片 / 图形容器 ---------- */
.sk-figure {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: var(--sk-hair);
  border-radius: var(--sk-radius-l);
  background:
    radial-gradient(600px 300px at 78% 12%, rgba(138, 107, 255, .28), transparent 66%),
    linear-gradient(140deg, rgba(14, 22, 48, .94), rgba(7, 11, 26, .96));
}
.sk-figure img { width: 100%; height: 100%; object-fit: cover; }
.sk-figure--square { aspect-ratio: 1 / 1; }
.sk-figure--tall { aspect-ratio: 3 / 4; }
.sk-figure--wide { aspect-ratio: 21 / 9; }
.sk-figure__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 18px 20px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--sk-star-dim);
  background: linear-gradient(180deg, transparent, rgba(7, 11, 26, .94));
}

@media (min-width: 1000px) {
  .sk-figure--bleed { margin-right: calc(var(--sk-gutter) * -1); border-top-right-radius: 0; border-bottom-right-radius: 0; }
}

.sk-orbit {
  position: absolute;
  border: 1px solid rgba(53, 211, 166, .26);
  border-radius: 50%;
  pointer-events: none;
}
.sk-glow {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  opacity: .55;
  filter: blur(52px);
  background: radial-gradient(circle, rgba(123, 231, 255, .5), transparent 68%);
}

/* ---------- 13. 页头 ---------- */
.sk-skip {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: var(--sk-capsule);
  background: var(--sk-moss);
  color: #04231d;
  font-size: 14px;
  font-weight: 700;
  transition: top .22s var(--sk-ease);
}
.sk-skip:focus { top: 14px; }

.sk-header {
  position: sticky;
  top: 0;
  z-index: 80;
  isolation: isolate;
}

.sk-topbar {
  max-height: 64px;
  overflow: hidden;
  border-bottom: 1px solid rgba(42, 52, 70, .9);
  background: linear-gradient(90deg, rgba(7, 11, 26, .97), rgba(14, 22, 48, .93));
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: max-height .34s var(--sk-ease);
}
.sk-topbar__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 3vw, 32px);
  width: 100%;
  max-width: var(--sk-max);
  height: var(--sk-topbar-h);
  margin: 0 auto;
  padding-inline: var(--sk-gutter);
  transition: height .34s var(--sk-ease);
}

.sk-brand { display: flex; align-items: baseline; gap: 10px; flex: none; }
.sk-brand__call {
  font-family: var(--sk-font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -.02em;
  color: var(--sk-star);
  text-shadow: 0 0 24px rgba(123, 231, 255, .38);
}
.sk-brand__sub {
  padding-left: 10px;
  border-left: 1px solid var(--sk-rock);
  font-family: var(--sk-font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--sk-moss);
  white-space: nowrap;
}

.sk-topbar__version {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  justify-content: center;
  overflow: hidden;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sk-mist);
  white-space: nowrap;
  text-overflow: ellipsis;
}
.sk-topbar__version .sk-mono { color: var(--sk-star-dim); }

.sk-topbar__side {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: none;
  font-size: 12px;
}
.sk-topbar__link {
  color: var(--sk-cyan);
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--sk-ease), color .2s var(--sk-ease);
}
.sk-topbar__link:hover { color: var(--sk-star); border-bottom-color: var(--sk-moss); }
.sk-topbar__icp {
  font-family: var(--sk-font-mono);
  letter-spacing: .05em;
  color: var(--sk-mist);
}

.sk-header[data-condensed] .sk-topbar { max-height: 42px; }
.sk-header[data-condensed] .sk-topbar__inner { height: 34px; }
.sk-header[data-condensed] .sk-brand__call { font-size: 17px; }

.sk-navbar {
  position: relative;
  border-bottom: 1px solid rgba(42, 52, 70, .88);
  background: rgba(14, 22, 48, .92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}
.sk-navbar__inner {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.6vw, 18px);
  width: 100%;
  max-width: var(--sk-max);
  min-height: var(--sk-navbar-h);
  margin: 0 auto;
  padding-inline: var(--sk-gutter);
}

.sk-nav { flex: 1 1 auto; min-width: 0; }
.sk-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, .8vw, 10px);
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}
.sk-nav__list::-webkit-scrollbar { display: none; }
.sk-nav__item { flex: 0 0 auto; }

.sk-nav__link {
  display: inline-block;
  padding: 9px 15px;
  border: 1px solid transparent;
  border-radius: var(--sk-capsule);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--sk-star-dim);
  white-space: nowrap;
  transition: color .22s var(--sk-ease), background-color .22s var(--sk-ease),
              border-color .22s var(--sk-ease), box-shadow .22s var(--sk-ease);
}
.sk-nav__link:hover {
  color: var(--sk-star);
  background: rgba(53, 211, 166, .1);
  border-color: rgba(53, 211, 166, .45);
  box-shadow: inset 0 0 22px rgba(53, 211, 166, .16);
}
.sk-nav__link[aria-current="page"] {
  color: #04231d;
  background: linear-gradient(120deg, var(--sk-moss), var(--sk-cyan));
  border-color: transparent;
  box-shadow: 0 0 26px rgba(53, 211, 166, .38);
}

.sk-burger {
  display: none;
  align-items: center;
  gap: 9px;
  flex: none;
  padding: 9px 14px;
  border: 1px solid var(--sk-rock);
  border-radius: var(--sk-capsule);
  background: rgba(7, 11, 26, .6);
  color: var(--sk-star);
}
.sk-burger__box { display: flex; flex-direction: column; gap: 3px; width: 16px; }
.sk-burger__box span {
  display: block;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .24s var(--sk-ease), opacity .24s var(--sk-ease);
}
.sk-burger__text { font-size: 14px; font-weight: 600; }
.sk-burger[aria-expanded="true"] .sk-burger__box span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.sk-burger[aria-expanded="true"] .sk-burger__box span:nth-child(2) { opacity: 0; }
.sk-burger[aria-expanded="true"] .sk-burger__box span:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

.sk-tagtoggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  padding: 9px 16px;
  border: 1px dashed rgba(138, 107, 255, .6);
  border-radius: var(--sk-capsule);
  font-size: 13px;
  font-weight: 600;
  color: var(--sk-star-dim);
  white-space: nowrap;
  transition: color .22s var(--sk-ease), background-color .22s var(--sk-ease), border-color .22s var(--sk-ease);
}
.sk-tagtoggle .sk-mono { font-size: 10px; letter-spacing: .2em; color: var(--sk-violet); }
.sk-tagtoggle:hover { color: var(--sk-star); background: rgba(138, 107, 255, .14); border-style: solid; }
.sk-tagtoggle[aria-expanded="true"] {
  color: var(--sk-star);
  background: rgba(138, 107, 255, .22);
  border-style: solid;
  border-color: var(--sk-violet);
}

.sk-tagpanel {
  display: none;
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  padding: 18px var(--sk-gutter) 22px;
  border-bottom: 1px solid var(--sk-rock);
  background: rgba(9, 14, 32, .98);
  box-shadow: 0 30px 56px -30px rgba(0, 0, 0, .95);
}
.sk-tagpanel[data-open] { display: block; animation: sk-drop .24s var(--sk-ease); }
.sk-tagpanel__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  max-width: var(--sk-max);
  margin: 0 auto;
}

@keyframes sk-drop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

.sk-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  height: 3px;
  background: rgba(42, 52, 70, .45);
  pointer-events: none;
}
.sk-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--sk-moss), var(--sk-cyan) 56%, var(--sk-violet));
}

/* ---------- 14. 页脚 ---------- */
.sk-footer {
  position: relative;
  margin-top: clamp(40px, 7vw, 92px);
  overflow: hidden;
  border-top: 1px solid rgba(42, 52, 70, .9);
  background: linear-gradient(180deg, rgba(7, 11, 26, .55), var(--sk-ink-2) 46%);
}
.sk-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--sk-moss), var(--sk-violet) 48%, var(--sk-clay));
}
.sk-footer__glow {
  position: absolute;
  top: -150px;
  right: -90px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(138, 107, 255, .3), transparent 68%);
  filter: blur(30px);
}
.sk-footer__inner {
  position: relative;
  width: 100%;
  max-width: var(--sk-max);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 72px) var(--sk-gutter) 28px;
}
.sk-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 3.4vw, 48px);
}
.sk-footer__col { min-width: 0; }
.sk-footer__col--brand { max-width: 40ch; }
.sk-footer__call {
  font-family: var(--sk-font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 2.6vw, 2.15rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--sk-star);
}
.sk-footer__sign {
  margin-top: 8px;
  font-family: var(--sk-font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--sk-moss);
}
.sk-footer__tagline {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--sk-mist);
}
.sk-footer__title {
  margin-bottom: 16px;
  font-family: var(--sk-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--sk-star-dim);
}
.sk-footer__list { display: flex; flex-direction: column; gap: 11px; font-size: 14px; }
.sk-footer__list a {
  color: var(--sk-star-dim);
  transition: color .2s var(--sk-ease), padding-left .2s var(--sk-ease);
}
.sk-footer__list a:hover { color: var(--sk-cyan); padding-left: 4px; }

.sk-footer__list--tags { flex-direction: row; flex-wrap: wrap; gap: 8px; }
.sk-footer__list--tags a:hover { padding-left: 12px; }

.sk-footer__list--contact { gap: 14px; }
.sk-footer__list--contact li { display: flex; flex-direction: column; gap: 3px; }
.sk-footer__list--contact span:last-child {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--sk-star-dim);
  overflow-wrap: anywhere;
}
.sk-footer__key { font-size: 11px; letter-spacing: .22em; color: var(--sk-clay); }

.sk-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 28px;
  margin-top: clamp(32px, 4vw, 54px);
  padding-top: 22px;
  border-top: 1px solid rgba(42, 52, 70, .85);
  font-size: 12.5px;
  color: var(--sk-mist);
}
.sk-footer__icp { font-family: var(--sk-font-mono); letter-spacing: .06em; }
.sk-footer__legal { display: flex; flex-wrap: wrap; gap: 18px; }
.sk-footer__legal a { transition: color .2s var(--sk-ease); }
.sk-footer__legal a:hover { color: var(--sk-cyan); }
.sk-footer__copy { font-family: var(--sk-font-mono); letter-spacing: .06em; }

.sk-totop {
  position: fixed;
  right: clamp(14px, 3vw, 30px);
  bottom: clamp(14px, 3vw, 30px);
  z-index: 75;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(53, 211, 166, .5);
  border-radius: 50%;
  background: rgba(14, 22, 48, .94);
  color: var(--sk-moss);
  font-size: 18px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  box-shadow: 0 18px 36px -20px rgba(53, 211, 166, .9);
  transition: opacity .26s var(--sk-ease), transform .26s var(--sk-ease),
              visibility .26s var(--sk-ease), background-color .2s var(--sk-ease), color .2s var(--sk-ease);
}
.sk-totop[data-visible] { opacity: 1; visibility: visible; transform: none; }
.sk-totop:hover { background: rgba(53, 211, 166, .2); color: var(--sk-star); }

/* ---------- 15. 滚动显现 ---------- */
.sk-js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .5s var(--sk-ease), transform .5s var(--sk-ease);
}
.sk-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
  transition-delay: var(--sk-reveal-delay, 0ms);
}

/* ---------- 16. 响应式 ---------- */
@media (min-width: 640px) {
  .sk-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .sk-footer__grid { grid-template-columns: 1.5fr 1fr 1.1fr 1.35fr; }
}

@media (max-width: 959px) {
  :root { --sk-sticky: 96px; }

  .sk-burger { display: inline-flex; }
  .sk-tagtoggle { margin-left: auto; }

  .sk-navbar__inner { min-height: 56px; padding-block: 8px; }

  .sk-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    max-height: calc(100vh - 56px);
    overflow-y: auto;
    padding: 14px var(--sk-gutter) 20px;
    border-bottom: 1px solid var(--sk-rock);
    background: rgba(7, 11, 26, .99);
    box-shadow: 0 34px 64px -34px rgba(0, 0, 0, .96);
  }
  .sk-nav[data-open] { display: block; animation: sk-drop .24s var(--sk-ease); }
  .sk-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    overflow: visible;
  }
  .sk-nav__link {
    display: block;
    padding: 13px 16px;
    border-radius: var(--sk-radius-m);
    border-color: rgba(42, 52, 70, .75);
    font-size: 16px;
  }
  .sk-nav__link[aria-current="page"] { border-color: transparent; }

  .sk-topbar__version { display: none; }
  .sk-topbar__icp { display: none; }
}

@media (max-width: 639px) {
  .sk-topbar { max-height: 44px; }
  .sk-topbar__inner { height: 40px; }
  .sk-header[data-condensed] .sk-topbar { max-height: 36px; }
  .sk-header[data-condensed] .sk-topbar__inner { height: 32px; }
  .sk-brand__call { font-size: 17px; }
  .sk-brand__sub { display: none; }
  .sk-tagtoggle { padding: 8px 12px; font-size: 12px; }
  .sk-burger__text { display: none; }
  .sk-totop { width: 42px; height: 42px; }
}

/* ---------- 17. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .sk-js [data-reveal] { opacity: 1; transform: none; }
}