/* ============================================================
   28杠官网 · 共享样式 /assets/site.css
   深墨蓝操作台 · 荧光青与暖橙高对比 · 极细边界工具面板
   ============================================================ */

/* ---------- 1. 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, fieldset {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
}

a { color: inherit; text-decoration: none; }

summary { list-style: none; cursor: pointer; }
summary::-webkit-details-marker { display: none; }

main { display: block; }

/* ---------- 2. 变量 ---------- */
:root {
  --sk-ink: #07131F;
  --sk-ink-2: #122836;
  --sk-mist: #A7C1CF;
  --sk-bone: #F2EDE4;
  --sk-cyan: #35F2D0;
  --sk-orange: #FF9E4A;
  --sk-moss: #7E9B7A;
  --sk-clay: #C96F4A;
  --sk-line: #2E4A5A;
  --sk-shadow: rgba(2, 10, 16, 0.55);

  --sk-font-display: "Oswald", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --sk-font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --sk-font-mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, Consolas, "Liberation Mono", monospace;

  --sk-max: 1240px;
  --sk-gutter: clamp(16px, 4vw, 40px);
  --sk-radius: 14px;
  --sk-radius-sm: 10px;
  --sk-pill: 999px;

  --sk-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --sk-fast: 160ms;
  --sk-mid: 220ms;
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--sk-ink);
  color: var(--sk-bone);
  font-family: var(--sk-font-body);
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image:
    radial-gradient(1100px 620px at 88% -12%, rgba(53, 242, 208, 0.10), transparent 62%),
    radial-gradient(760px 520px at -12% 6%, rgba(255, 158, 74, 0.09), transparent 66%),
    linear-gradient(180deg, rgba(18, 40, 54, 0.68), rgba(7, 19, 31, 0) 44%);
  background-repeat: no-repeat;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--sk-font-display);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--sk-bone);
}

p { max-width: 46em; }

strong { font-weight: 700; color: var(--sk-bone); }

::selection {
  background: var(--sk-cyan);
  color: #04121b;
}

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

.sk-sr {
  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;
}

/* ---------- 4. 布局工具 ---------- */
.sk-container {
  width: 100%;
  max-width: var(--sk-max);
  margin-inline: auto;
  padding-inline: var(--sk-gutter);
}

.sk-section { padding-block: clamp(36px, 5.5vw, 80px); }
.sk-section--tight { padding-block: clamp(22px, 3.4vw, 44px); }

.sk-stack {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2.2vw, 26px);
}

.sk-grid {
  display: grid;
  gap: clamp(12px, 2vw, 20px);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
}

.sk-grid--2,
.sk-grid--3,
.sk-grid--4 { grid-template-columns: 1fr; }

@media (min-width: 640px) {
  .sk-grid--2,
  .sk-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sk-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 960px) {
  .sk-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sk-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.sk-rule {
  height: 1px;
  border: 0;
  background: var(--sk-line);
  margin-block: clamp(20px, 3vw, 34px);
}

/* ---------- 5. 文字组件 ---------- */
.sk-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--sk-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--sk-mist);
}

.sk-eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--sk-cyan);
  flex: 0 0 auto;
}

.sk-title {
  font-family: var(--sk-font-display);
  font-size: clamp(28px, 4.4vw, 52px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--sk-bone);
}

.sk-lede {
  margin-top: 14px;
  font-size: clamp(15px, 1.75vw, 17px);
  line-height: 1.75;
  color: var(--sk-mist);
  max-width: 40em;
}

.sk-mono {
  font-family: var(--sk-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.sk-link {
  color: var(--sk-cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: rgba(53, 242, 208, 0.4);
  transition: text-decoration-color var(--sk-fast) var(--sk-ease), color var(--sk-fast) var(--sk-ease);
}

.sk-link:hover {
  color: #7ff8e3;
  text-decoration-color: var(--sk-cyan);
}

.sk-prose { max-width: 44em; }
.sk-prose p { max-width: none; }
.sk-prose p + p { margin-top: 1em; }
.sk-prose h2 {
  margin-top: 1.9em;
  margin-bottom: 0.5em;
  font-size: clamp(20px, 2.4vw, 26px);
}
.sk-prose h3 {
  margin-top: 1.5em;
  margin-bottom: 0.4em;
  font-size: clamp(17px, 2vw, 20px);
}
.sk-prose ul { margin-top: 0.8em; display: flex; flex-direction: column; gap: 0.45em; }
.sk-prose li { position: relative; padding-left: 18px; color: var(--sk-mist); }
.sk-prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--sk-cyan);
}

/* ---------- 6. 按钮 ---------- */
.sk-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--sk-pill);
  border: 1px solid transparent;
  font-family: var(--sk-font-body);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition:
    transform var(--sk-fast) var(--sk-ease),
    background-color var(--sk-fast) var(--sk-ease),
    border-color var(--sk-fast) var(--sk-ease),
    color var(--sk-fast) var(--sk-ease),
    box-shadow var(--sk-fast) var(--sk-ease);
}

.sk-btn:hover { transform: translateY(-2px); }

.sk-btn--primary {
  background: var(--sk-cyan);
  color: #04121b;
  box-shadow: 0 12px 28px -18px rgba(53, 242, 208, 0.95);
}
.sk-btn--primary:hover { background: #5ff7dd; }

.sk-btn--ghost {
  color: var(--sk-cyan);
  border-color: rgba(53, 242, 208, 0.42);
  background: rgba(53, 242, 208, 0.06);
}
.sk-btn--ghost:hover {
  background: rgba(53, 242, 208, 0.14);
  border-color: rgba(53, 242, 208, 0.72);
}

.sk-btn--warm {
  color: var(--sk-orange);
  border-color: rgba(255, 158, 74, 0.45);
  background: rgba(255, 158, 74, 0.08);
}
.sk-btn--warm:hover {
  background: rgba(255, 158, 74, 0.16);
  border-color: rgba(255, 158, 74, 0.75);
}

.sk-btn--quiet {
  color: var(--sk-bone);
  border-color: var(--sk-line);
  background: rgba(18, 40, 54, 0.62);
}
.sk-btn--quiet:hover {
  border-color: rgba(167, 193, 207, 0.6);
  background: rgba(18, 40, 54, 0.9);
}

/* ---------- 7. 跳转链 ---------- */
.sk-skip {
  position: fixed;
  left: 50%;
  top: 10px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--sk-pill);
  background: var(--sk-cyan);
  color: #04121b;
  font-family: var(--sk-font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  transform: translate(-50%, -180%);
  transition: transform var(--sk-fast) var(--sk-ease);
}

.sk-skip:focus { transform: translate(-50%, 0); }

/* ---------- 8. 头部 · 悬浮胶囊浮岛 ---------- */
.sk-header {
  position: sticky;
  top: 0;
  z-index: 90;
  padding: 10px var(--sk-gutter) 0;
}

.sk-header__island {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  max-width: var(--sk-max);
  margin-inline: auto;
  padding: 9px 12px 9px 14px;
  border: 1px solid var(--sk-line);
  border-radius: var(--sk-pill);
  background: linear-gradient(180deg, rgba(18, 40, 54, 0.94), rgba(7, 19, 31, 0.94));
  box-shadow:
    0 22px 44px -30px #000,
    inset 0 1px 0 rgba(167, 193, 207, 0.10);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition:
    border-radius var(--sk-mid) var(--sk-ease),
    border-color var(--sk-mid) var(--sk-ease);
}

.sk-header[data-open] .sk-header__island {
  border-radius: 24px;
  border-color: rgba(53, 242, 208, 0.42);
}

.sk-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 3px 2px;
}

.sk-brand__mark {
  font-family: var(--sk-font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
  padding: 2px 7px;
  border-radius: 8px;
  color: var(--sk-cyan);
  background: rgba(53, 242, 208, 0.12);
  box-shadow: inset 0 0 0 1px rgba(53, 242, 208, 0.35);
  transition: background-color var(--sk-fast) var(--sk-ease), color var(--sk-fast) var(--sk-ease);
}

.sk-brand:hover .sk-brand__mark {
  background: rgba(53, 242, 208, 0.24);
  color: #eafff9;
}

.sk-brand__name {
  font-family: var(--sk-font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.12em;
  color: var(--sk-bone);
}

.sk-brand__slash {
  color: var(--sk-orange);
  margin-left: 3px;
}

/* 导航：移动端为折叠面板 */
.sk-nav {
  order: 3;
  flex: 1 1 100%;
  display: none;
}

.sk-header[data-open] .sk-nav {
  display: block;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--sk-line);
}

.sk-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sk-nav__link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 15px;
  color: var(--sk-mist);
  transition:
    color var(--sk-fast) var(--sk-ease),
    background-color var(--sk-fast) var(--sk-ease),
    box-shadow var(--sk-fast) var(--sk-ease);
}

.sk-nav__link:hover {
  color: var(--sk-bone);
  background: rgba(53, 242, 208, 0.08);
}

.sk-nav__idx {
  font-family: var(--sk-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(167, 193, 207, 0.5);
  transition: color var(--sk-fast) var(--sk-ease);
}

.sk-nav__link[aria-current="page"] {
  color: var(--sk-cyan);
  background: rgba(53, 242, 208, 0.10);
  box-shadow: inset 0 0 0 1px rgba(53, 242, 208, 0.42);
}

.sk-nav__link[aria-current="page"] .sk-nav__idx { color: var(--sk-cyan); }

.sk-header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.sk-header__cta {
  padding: 8px 15px;
  font-size: 13px;
  white-space: nowrap;
}

/* 移动导航按钮 */
.sk-navtoggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px 8px 12px;
  border-radius: var(--sk-pill);
  border: 1px solid var(--sk-line);
  background: rgba(18, 40, 54, 0.72);
  color: var(--sk-bone);
  cursor: pointer;
  transition:
    border-color var(--sk-fast) var(--sk-ease),
    background-color var(--sk-fast) var(--sk-ease),
    color var(--sk-fast) var(--sk-ease);
}

.sk-navtoggle:hover {
  border-color: rgba(53, 242, 208, 0.5);
  background: rgba(53, 242, 208, 0.08);
}

.sk-navtoggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 14px;
  flex: 0 0 auto;
}

.sk-navtoggle__bars span {
  display: block;
  width: 100%;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--sk-fast) var(--sk-ease);
}

.sk-navtoggle__text {
  font-size: 13px;
  letter-spacing: 0.04em;
}

.sk-navtoggle[aria-expanded="true"] {
  color: var(--sk-cyan);
  border-color: rgba(53, 242, 208, 0.55);
}

.sk-navtoggle[aria-expanded="true"] .sk-navtoggle__bars span:first-child {
  transform: translateY(2.75px) rotate(45deg);
}

.sk-navtoggle[aria-expanded="true"] .sk-navtoggle__bars span:last-child {
  transform: translateY(-2.75px) rotate(-45deg);
}

/* 桌面：横排胶囊导航 */
@media (min-width: 900px) {
  .sk-header { padding-top: 14px; }

  .sk-header__island {
    flex-wrap: nowrap;
    gap: 16px;
    padding: 8px 10px 8px 16px;
  }

  .sk-nav {
    order: 0;
    flex: 1 1 auto;
    display: block;
    margin: 0;
    padding: 0;
    border-top: 0;
  }

  .sk-header[data-open] .sk-nav {
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
  }

  .sk-nav__list {
    flex-direction: row;
    justify-content: center;
    gap: 2px;
  }

  .sk-nav__link {
    padding: 8px 13px;
    font-size: 14px;
    border-radius: var(--sk-pill);
  }

  .sk-navtoggle { display: none; }
}

/* ---------- 9. 页脚 · 岩层基座 ---------- */
.sk-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  border-top: 1px solid var(--sk-line);
  background:
    linear-gradient(180deg, rgba(18, 40, 54, 0.92), rgba(7, 19, 31, 0.98)),
    var(--sk-ink-2);
  color: var(--sk-mist);
}

.sk-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(46, 74, 90, 0.4) 0 1px,
    transparent 1px 88px
  );
  opacity: 0.4;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 72%);
  mask-image: linear-gradient(180deg, #000, transparent 72%);
}

.sk-footer__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(34px, 5vw, 62px) 22px;
}

.sk-footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 46px);
}

@media (min-width: 820px) {
  .sk-footer__top {
    grid-template-columns: 1.5fr 1fr 1.2fr;
    align-items: start;
  }
}

.sk-footer__brand {
  font-family: var(--sk-font-display);
  font-size: clamp(19px, 2.3vw, 25px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--sk-bone);
  max-width: 22em;
}

.sk-footer__mark {
  display: inline-block;
  font-family: var(--sk-font-mono);
  font-size: 0.66em;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.6;
  padding: 1px 6px;
  margin-right: 7px;
  vertical-align: middle;
  color: var(--sk-orange);
  border: 1px solid rgba(255, 158, 74, 0.45);
  border-radius: 6px;
  background: rgba(255, 158, 74, 0.08);
}

.sk-footer__note {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(167, 193, 207, 0.75);
  max-width: 34em;
}

.sk-footer__heading {
  font-family: var(--sk-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(167, 193, 207, 0.7);
  margin-bottom: 14px;
}

.sk-footer__list {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.sk-footer__list li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--sk-mist);
  word-break: break-word;
}

.sk-footer__list li .sk-mono {
  display: inline-block;
  min-width: 2.6em;
  margin-right: 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(167, 193, 207, 0.55);
}

.sk-footer__list a {
  display: inline-block;
  padding: 3px 0;
  font-size: 14px;
  color: var(--sk-mist);
  border-bottom: 1px solid transparent;
  transition: color var(--sk-fast) var(--sk-ease), border-color var(--sk-fast) var(--sk-ease);
}

.sk-footer__list a:hover {
  color: var(--sk-cyan);
  border-bottom-color: rgba(53, 242, 208, 0.5);
}

.sk-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  margin-top: clamp(26px, 4vw, 42px);
  padding-top: 18px;
  border-top: 1px solid var(--sk-line);
  font-family: var(--sk-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(167, 193, 207, 0.7);
}

.sk-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 12px;
  margin-right: auto;
  max-width: none;
}

.sk-footer__legal a {
  color: var(--sk-mist);
  transition: color var(--sk-fast) var(--sk-ease);
}

.sk-footer__legal a:hover { color: var(--sk-cyan); }

.sk-footer__sep { color: rgba(46, 74, 90, 1); }

.sk-footer__icp { color: rgba(167, 193, 207, 0.6); max-width: none; }

.sk-footer__copy { color: rgba(167, 193, 207, 0.45); max-width: none; }

/* ---------- 10. 卡片与标签 ---------- */
.sk-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: clamp(16px, 2.2vw, 22px);
  border: 1px solid var(--sk-line);
  border-radius: var(--sk-radius);
  background: linear-gradient(180deg, rgba(18, 40, 54, 0.86), rgba(7, 19, 31, 0.86));
  box-shadow: 0 20px 44px -34px var(--sk-shadow);
  transition:
    transform var(--sk-fast) var(--sk-ease),
    border-color var(--sk-fast) var(--sk-ease),
    box-shadow var(--sk-fast) var(--sk-ease);
}

.sk-card:hover {
  transform: translateY(-2px);
  border-color: rgba(53, 242, 208, 0.45);
  box-shadow: 0 26px 48px -32px #000;
}

.sk-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.sk-card__title {
  font-family: var(--sk-font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--sk-bone);
}

.sk-card__text {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--sk-mist);
}

.sk-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border-radius: var(--sk-pill);
  border: 1px solid var(--sk-line);
  background: rgba(18, 40, 54, 0.7);
  font-family: var(--sk-font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.08em;
  color: var(--sk-mist);
  white-space: nowrap;
}

.sk-tag--cyan {
  color: var(--sk-cyan);
  border-color: rgba(53, 242, 208, 0.45);
  background: rgba(53, 242, 208, 0.10);
}

.sk-tag--orange {
  color: var(--sk-orange);
  border-color: rgba(255, 158, 74, 0.45);
  background: rgba(255, 158, 74, 0.10);
}

.sk-tag--moss {
  color: var(--sk-moss);
  border-color: rgba(126, 155, 122, 0.55);
  background: rgba(126, 155, 122, 0.14);
}

.sk-tag--clay {
  color: var(--sk-clay);
  border-color: rgba(201, 111, 74, 0.55);
  background: rgba(201, 111, 74, 0.14);
}

/* ---------- 11. 折叠面板 ---------- */
.sk-panel {
  border: 1px solid var(--sk-line);
  border-radius: var(--sk-radius-sm);
  background: rgba(18, 40, 54, 0.6);
  overflow: hidden;
}

.sk-panel + .sk-panel { margin-top: 10px; }

.sk-panel > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--sk-bone);
  transition: background-color var(--sk-fast) var(--sk-ease), color var(--sk-fast) var(--sk-ease);
}

.sk-panel > summary:hover {
  background: rgba(53, 242, 208, 0.07);
  color: var(--sk-cyan);
}

.sk-panel > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--sk-font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--sk-cyan);
  transition: transform var(--sk-mid) var(--sk-ease);
}

.sk-panel[open] > summary {
  border-bottom: 1px solid var(--sk-line);
  margin-bottom: 12px;
}

.sk-panel[open] > summary::after { transform: rotate(45deg); }

.sk-panel__body {
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--sk-mist);
}

.sk-panel__body p { max-width: none; }

/* ---------- 12. 横向滑动条 ---------- */
.sk-rail {
  display: flex;
  gap: clamp(12px, 2vw, 18px);
  overflow-x: auto;
  padding: 4px 2px 14px;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: rgba(53, 242, 208, 0.4) transparent;
  -webkit-overflow-scrolling: touch;
}

.sk-rail > * {
  flex: 0 0 auto;
  width: min(280px, 78vw);
  scroll-snap-align: start;
}

.sk-rail::-webkit-scrollbar { height: 6px; }
.sk-rail::-webkit-scrollbar-track {
  background: rgba(46, 74, 90, 0.35);
  border-radius: 99px;
}
.sk-rail::-webkit-scrollbar-thumb {
  background: rgba(53, 242, 208, 0.35);
  border-radius: 99px;
}

/* ---------- 13. 图片容器基础规则 ---------- */
.sk-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--sk-line);
  border-radius: var(--sk-radius);
  aspect-ratio: 16 / 10;
  background-color: var(--sk-ink-2);
  background-image:
    linear-gradient(135deg, rgba(53, 242, 208, 0.14), rgba(7, 19, 31, 0) 55%),
    repeating-linear-gradient(0deg, rgba(46, 74, 90, 0.45) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(90deg, rgba(46, 74, 90, 0.45) 0 1px, transparent 1px 28px);
}

.sk-media img,
.sk-media video,
.sk-media svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sk-media--wide { aspect-ratio: 21 / 9; }
.sk-media--square { aspect-ratio: 1 / 1; }
.sk-media--tall { aspect-ratio: 4 / 5; }

.sk-figure { margin: 0; }

.sk-figure figcaption {
  margin-top: 10px;
  font-family: var(--sk-font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: rgba(167, 193, 207, 0.7);
}

/* ---------- 14. 面包屑 ---------- */
.sk-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--sk-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: rgba(167, 193, 207, 0.7);
}

.sk-crumbs a {
  color: var(--sk-mist);
  transition: color var(--sk-fast) var(--sk-ease);
}

.sk-crumbs a:hover { color: var(--sk-cyan); }

.sk-crumbs__sep { color: rgba(46, 74, 90, 1); }

.sk-crumbs [aria-current="page"] { color: var(--sk-bone); }

/* ---------- 15. JS 注入组件 ---------- */
.sk-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 120;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--sk-cyan), var(--sk-orange));
  box-shadow: 0 0 12px rgba(53, 242, 208, 0.55);
  pointer-events: none;
  transition: width 80ms linear;
}

.sk-top {
  position: fixed;
  right: clamp(12px, 3vw, 24px);
  bottom: clamp(12px, 3vw, 24px);
  z-index: 110;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--sk-pill);
  border: 1px solid rgba(53, 242, 208, 0.4);
  background: rgba(7, 19, 31, 0.86);
  color: var(--sk-cyan);
  font-family: var(--sk-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition:
    opacity var(--sk-mid) var(--sk-ease),
    transform var(--sk-mid) var(--sk-ease),
    background-color var(--sk-fast) var(--sk-ease);
}

.sk-top[data-visible] {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.sk-top:hover { background: rgba(53, 242, 208, 0.16); }

.sk-top__arrow {
  font-size: 13px;
  line-height: 1;
}

/* ---------- 16. 窄屏微调 ---------- */
@media (max-width: 420px) {
  .sk-header__cta { display: none; }
  .sk-navtoggle__text { display: none; }
  .sk-navtoggle { padding: 8px 12px; }
  .sk-brand__name { font-size: 18px; }
}

/* ---------- 17. 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;
  }

  .sk-btn:hover,
  .sk-card:hover,
  .sk-top[data-visible] { transform: none; }

  .sk-progress { transition: none; }
}