/* 小鸟体育入口 · /assets/site.css
   共享外壳：品牌轨道 / 双层导航 / 页脚 / 通用版式与组件 */

*, *::before, *::after { box-sizing: border-box; }

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

body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd {
  margin: 0;
}

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

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

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

button { background: none; border: 0; cursor: pointer; }

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

:root {
  --bx-ink: #0B1F2A;
  --bx-jade: #0E7C72;
  --bx-jade-deep: #075E57;
  --bx-lime: #C7F464;
  --bx-lime-soft: #D8FF86;
  --bx-coral: #FF6B4A;
  --bx-paper: #F7F3E8;
  --bx-mist: #D8E6E2;
  --bx-indigo: #3A2D6B;
  --bx-wine: #7A2436;
  --bx-brass: #B88A44;
  --bx-card: #FCFAF4;

  --bx-on-dark: rgba(247, 243, 232, 0.78);
  --bx-on-dark-soft: rgba(247, 243, 232, 0.46);
  --bx-on-light: rgba(11, 31, 42, 0.74);
  --bx-line-dark: rgba(11, 31, 42, 0.14);
  --bx-line-light: rgba(247, 243, 232, 0.16);

  --bx-rail-w: 264px;
  --bx-header-h: 66px;
  --bx-shadow: 0 20px 44px -30px rgba(11, 31, 42, 0.6);

  --bx-font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --bx-font-sans: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --bx-font-mono: "IBM Plex Mono", "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;

  --bx-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --bx-scroll: 0;
}

body {
  min-height: 100dvh;
  background: var(--bx-paper);
  color: var(--bx-ink);
  font-family: var(--bx-font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--bx-font-display);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: 0.01em;
}

p, li { text-wrap: pretty; }

:target { scroll-margin-block-start: calc(var(--bx-header-h) + 20px); }

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--bx-jade);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px rgba(199, 244, 100, 0.5);
}

.bx-rail :focus-visible,
.bx-footer :focus-visible {
  outline-color: var(--bx-lime);
  box-shadow: 0 0 0 4px rgba(11, 31, 42, 0.7);
}

/* ---------------- 跳转链接 ---------------- */
.bx-skip {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--bx-lime);
  color: var(--bx-ink);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  transform: translateY(-180%);
  transition: transform 0.2s var(--bx-ease);
}

.bx-skip:focus { transform: translateY(0); }

/* ---------------- 阅读进度轨迹 ---------------- */
.bx-progress {
  position: fixed;
  z-index: 80;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--bx-lime), var(--bx-jade));
  transform: scaleX(var(--bx-scroll, 0));
  transform-origin: 0 50%;
}

/* ---------------- 头部与品牌轨道 ---------------- */
.bx-header {
  position: sticky;
  top: 0;
  z-index: 60;
}

.bx-rail {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: var(--bx-header-h);
  padding: 10px 16px;
  background-color: var(--bx-ink);
  background-image: repeating-linear-gradient(115deg, rgba(199, 244, 100, 0.05) 0 1px, transparent 1px 17px);
  color: var(--bx-paper);
  border-bottom: 1px solid var(--bx-line-light);
}

.bx-brand {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
  color: var(--bx-paper);
}

.bx-brand__mark {
  flex: none;
  width: 38px;
  height: 38px;
  background:
    repeating-linear-gradient(118deg, transparent 0 6px, rgba(11, 31, 42, 0.5) 6px 8px),
    linear-gradient(150deg, var(--bx-lime) 0%, var(--bx-jade) 62%, var(--bx-jade-deep) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 74%, 76% 100%, 0 100%);
}

.bx-brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  overflow: hidden;
}

.bx-brand__name {
  font-family: var(--bx-font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--bx-paper);
}

.bx-brand__tag {
  display: none;
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.12em;
  color: var(--bx-on-dark-soft);
}

.bx-burger {
  position: relative;
  z-index: 1;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 11px;
  border: 1px solid var(--bx-line-light);
  background: rgba(14, 124, 114, 0.18);
  transition: border-color 0.2s var(--bx-ease), background-color 0.2s var(--bx-ease);
}

.bx-burger:hover { border-color: var(--bx-lime); background: rgba(14, 124, 114, 0.34); }

.bx-burger__line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--bx-lime);
  transition: transform 0.25s var(--bx-ease), opacity 0.2s linear;
}

.bx-burger[aria-expanded="true"] .bx-burger__line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.bx-burger[aria-expanded="true"] .bx-burger__line:nth-child(2) { opacity: 0; }
.bx-burger[aria-expanded="true"] .bx-burger__line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 双层导航：移动端为下拉面板 */
.bx-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-height: calc(100dvh - var(--bx-header-h));
  overflow-y: auto;
  padding: 18px 16px 24px;
  background-color: var(--bx-ink);
  background-image: radial-gradient(circle at 100% 0%, rgba(14, 124, 114, 0.42), transparent 62%);
  border-bottom: 1px solid var(--bx-line-light);
  box-shadow: var(--bx-shadow);
  visibility: hidden;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.24s var(--bx-ease), transform 0.24s var(--bx-ease), visibility 0.24s;
}

.bx-nav[data-open] {
  visibility: visible;
  opacity: 1;
  transform: none;
}

.bx-nav__eyebrow {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--bx-on-dark-soft);
}

.bx-nav__list {
  counter-reset: bxnav;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.bx-nav__link {
  position: relative;
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: center;
  gap: 8px;
  padding: 12px 12px 12px 10px;
  color: var(--bx-on-dark);
  font-family: var(--bx-font-sans);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.3;
  border-inline-start: 2px solid transparent;
  transition: background-color 0.2s var(--bx-ease), color 0.2s var(--bx-ease),
              border-color 0.2s var(--bx-ease), transform 0.2s var(--bx-ease);
}

.bx-nav__link::before {
  counter-increment: bxnav;
  content: "0" counter(bxnav);
  font-family: var(--bx-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
  color: var(--bx-on-dark-soft);
  transition: color 0.2s var(--bx-ease);
}

.bx-nav__link:hover {
  background: rgba(14, 124, 114, 0.24);
  color: var(--bx-paper);
  border-inline-start-color: var(--bx-lime);
  transform: translateX(3px);
}

.bx-nav__link:hover::before { color: var(--bx-lime); }

.bx-nav__link[aria-current="page"] {
  background: var(--bx-jade-deep);
  color: var(--bx-paper);
  border-inline-start-color: var(--bx-lime);
}

.bx-nav__link[aria-current="page"]::before { color: var(--bx-lime); }

.bx-nav__foot {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.bx-rail__search {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 12px 14px;
  border: 1px solid rgba(14, 124, 114, 0.8);
  background: rgba(14, 124, 114, 0.16);
  color: var(--bx-paper);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: border-color 0.2s var(--bx-ease), background-color 0.2s var(--bx-ease),
              transform 0.2s var(--bx-ease);
}

.bx-rail__search:hover {
  border-color: var(--bx-lime);
  background: rgba(199, 244, 100, 0.1);
  transform: translateX(2px);
}

.bx-rail__searchglass {
  position: relative;
  flex: none;
  width: 13px;
  height: 13px;
  border: 1.5px solid var(--bx-lime);
  border-radius: 2px;
}

.bx-rail__searchglass::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -1px;
  width: 5px;
  height: 1.5px;
  background: var(--bx-lime);
  transform: rotate(48deg);
}

.bx-rail__searchtext { line-height: 1.2; }

.bx-nav__status {
  font-family: var(--bx-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--bx-on-dark-soft);
}

/* ---------------- 页脚 ---------------- */
.bx-footer {
  position: relative;
  background-color: var(--bx-ink);
  background-image:
    radial-gradient(circle at 88% 6%, rgba(14, 124, 114, 0.42), transparent 46%),
    linear-gradient(180deg, rgba(14, 124, 114, 0.22), rgba(11, 31, 42, 0) 340px);
  color: var(--bx-paper);
  border-top: 3px solid var(--bx-lime);
  overflow: hidden;
}

.bx-footer__inner {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding: 54px 20px 26px;
}

.bx-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-block-end: 34px;
  border-bottom: 1px solid var(--bx-line-light);
}

.bx-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
}

.bx-footer__wordmark {
  font-family: var(--bx-font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--bx-paper);
}

.bx-footer__tagline {
  margin-block-start: 12px;
  max-width: 30ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--bx-on-dark);
}

.bx-footer__cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-block-start: 22px;
  padding: 12px 18px;
  background: var(--bx-lime);
  border: 1px solid var(--bx-lime);
  color: var(--bx-ink);
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  transition: background-color 0.2s var(--bx-ease), color 0.2s var(--bx-ease),
              transform 0.2s var(--bx-ease);
}

.bx-footer__cta::after {
  content: "→";
  font-family: var(--bx-font-mono);
  font-size: 15px;
  transition: transform 0.2s var(--bx-ease);
}

.bx-footer__cta:hover {
  background: transparent;
  color: var(--bx-lime);
  transform: translateY(-2px);
}

.bx-footer__cta:hover::after { transform: translateX(4px); }

.bx-footer__map,
.bx-footer__contact { min-width: 0; }

.bx-footer__maptitle {
  padding-block-end: 12px;
  margin-block-end: 14px;
  border-bottom: 1px solid var(--bx-line-light);
  font-family: var(--bx-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--bx-on-dark-soft);
}

.bx-footer__links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 20px;
}

.bx-footer__link {
  display: inline-block;
  padding-block: 3px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--bx-on-dark);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--bx-ease), border-color 0.2s var(--bx-ease);
}

.bx-footer__link:hover {
  color: var(--bx-lime);
  border-bottom-color: rgba(199, 244, 100, 0.6);
}

.bx-footer__link[aria-current="page"] {
  color: var(--bx-lime);
  font-weight: 700;
}

.bx-footer__contactlist {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.bx-footer__address {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--bx-on-dark);
}

.bx-footer__note {
  margin-block-start: 14px;
  font-size: 12px;
  line-height: 1.75;
  color: var(--bx-on-dark-soft);
}

.bx-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  padding-block-start: 22px;
}

.bx-footer__legal {
  font-family: var(--bx-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--bx-on-dark-soft);
}

.bx-footer__bottomnav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.bx-footer__bottomnav .bx-footer__link { font-size: 12.5px; }

/* ---------------- 复制条 ---------------- */
.bx-copy {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  max-width: 100%;
  padding: 8px 12px;
  border: 1px solid rgba(247, 243, 232, 0.22);
  background: rgba(247, 243, 232, 0.04);
  color: var(--bx-paper);
  font-family: var(--bx-font-mono);
  font-size: 12.5px;
  line-height: 1.4;
  text-align: start;
  transition: border-color 0.2s var(--bx-ease), background-color 0.2s var(--bx-ease);
}

.bx-copy:hover {
  border-color: var(--bx-lime);
  background: rgba(199, 244, 100, 0.08);
}

.bx-copy__value { overflow-wrap: anywhere; }

.bx-copy__action {
  flex: none;
  padding: 3px 6px;
  border: 1px solid currentColor;
  font-family: var(--bx-font-sans);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--bx-on-dark-soft);
  transition: color 0.2s var(--bx-ease), background-color 0.2s var(--bx-ease),
              border-color 0.2s var(--bx-ease);
}

.bx-copy:hover .bx-copy__action { color: var(--bx-lime); }

.bx-copy[data-state="copied"] { border-color: var(--bx-lime); }

.bx-copy[data-state="copied"] .bx-copy__action {
  color: var(--bx-ink);
  background: var(--bx-lime);
  border-color: var(--bx-lime);
}

.bx-copy[data-state="failed"] .bx-copy__action {
  color: var(--bx-coral);
  border-color: var(--bx-coral);
}

/* ---------------- 通用版式 ---------------- */
.bx-wrap {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: 20px;
}

.bx-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 20px;
}

.bx-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--bx-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  line-height: 1.5;
  color: var(--bx-jade);
}

.bx-eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}

.bx-section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.bx-section-title {
  font-family: var(--bx-font-display);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.005em;
}

/* ---------------- 按钮 ---------------- */
.bx-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid var(--bx-jade);
  background: var(--bx-jade);
  color: var(--bx-paper);
  font-family: var(--bx-font-sans);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
  line-height: 1.3;
  transition: background-color 0.2s var(--bx-ease), border-color 0.2s var(--bx-ease),
              color 0.2s var(--bx-ease), transform 0.2s var(--bx-ease);
}

.bx-btn:hover {
  background: var(--bx-jade-deep);
  border-color: var(--bx-jade-deep);
  transform: translateY(-2px);
}

.bx-btn--lime {
  background: var(--bx-lime);
  border-color: var(--bx-lime);
  color: var(--bx-ink);
}

.bx-btn--lime:hover {
  background: var(--bx-lime-soft);
  border-color: var(--bx-lime-soft);
  color: var(--bx-ink);
}

.bx-btn--ghost {
  background: transparent;
  border-color: var(--bx-line-light);
  color: var(--bx-paper);
}

.bx-btn--ghost:hover {
  background: rgba(199, 244, 100, 0.08);
  border-color: var(--bx-lime);
  color: var(--bx-lime);
}

/* ---------------- 标签 / 数字 / 卡片 ---------------- */
.bx-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--bx-line-dark);
  background: var(--bx-mist);
  color: var(--bx-jade-deep);
  font-family: var(--bx-font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.5;
}

.bx-tag--lime { background: var(--bx-lime); border-color: transparent; color: var(--bx-ink); }
.bx-tag--coral { background: var(--bx-coral); border-color: transparent; color: #2A0B05; }
.bx-tag--wine { background: var(--bx-wine); border-color: transparent; color: var(--bx-paper); }
.bx-tag--indigo { background: var(--bx-indigo); border-color: transparent; color: var(--bx-paper); }

.bx-num {
  font-family: var(--bx-font-mono);
  font-weight: 700;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.bx-num--coral { color: var(--bx-coral); }
.bx-num--lime { color: var(--bx-lime); }

.bx-card {
  position: relative;
  padding: 22px;
  background: var(--bx-card);
  border: 1px solid var(--bx-line-dark);
  box-shadow: var(--bx-shadow);
}

/* ---------------- 图片容器 ---------------- */
.bx-media {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--bx-mist);
  border: 1px solid var(--bx-line-dark);
}

.bx-media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bx-media:empty::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(135deg, rgba(14, 124, 114, 0.16) 0 1px, transparent 1px 12px),
    linear-gradient(160deg, var(--bx-mist), #EAF2EF);
}

.bx-media--16x9 { aspect-ratio: 16 / 9; }
.bx-media--4x3 { aspect-ratio: 4 / 3; }
.bx-media--3x2 { aspect-ratio: 3 / 2; }
.bx-media--1x1 { aspect-ratio: 1 / 1; }
.bx-media--wide { aspect-ratio: 21 / 9; }

/* ---------------- 折叠组 ---------------- */
.bx-acc {
  border: 1px solid var(--bx-line-dark);
  background: var(--bx-card);
}

.bx-acc + .bx-acc { margin-block-start: -1px; }

.bx-acc__trigger {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 20px;
  text-align: start;
  font-family: var(--bx-font-sans);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--bx-ink);
  transition: background-color 0.2s var(--bx-ease), color 0.2s var(--bx-ease);
}

.bx-acc__trigger:hover { background: rgba(14, 124, 114, 0.07); }

.bx-acc__trigger::after {
  content: "+";
  flex: none;
  font-family: var(--bx-font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--bx-jade);
  transition: transform 0.25s var(--bx-ease);
}

.bx-acc__trigger[aria-expanded="true"]::after { transform: rotate(45deg); }

.bx-acc__panel {
  display: grid;
  grid-template-rows: 0fr;
  visibility: hidden;
  transition: grid-template-rows 0.32s var(--bx-ease), visibility 0.32s;
}

.bx-acc__trigger[aria-expanded="true"] + .bx-acc__panel {
  grid-template-rows: 1fr;
  visibility: visible;
}

.bx-acc__body {
  overflow: hidden;
  padding-inline: 20px;
}

.bx-acc__body > :first-child { margin-block-start: 0; }
.bx-acc__body > :last-child { margin-block-end: 18px; }

/* ---------------- 面包屑 ---------------- */
.bx-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--bx-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--bx-on-light);
}

.bx-crumb__link {
  color: var(--bx-jade);
  transition: color 0.2s var(--bx-ease);
}

.bx-crumb__link:hover {
  color: var(--bx-coral);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.bx-crumb__sep { color: rgba(11, 31, 42, 0.32); }

.bx-crumb__current {
  color: var(--bx-ink);
  font-weight: 700;
}

/* ---------------- 章节导航 ---------------- */
.bx-toc {
  position: sticky;
  top: calc(var(--bx-header-h) + 16px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-inline-start: 16px;
  border-inline-start: 1px solid var(--bx-line-dark);
}

.bx-toc__title {
  font-family: var(--bx-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--bx-on-light);
}

.bx-toc__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.bx-toc__link {
  display: block;
  margin-inline-start: -17px;
  padding: 4px 0 4px 10px;
  border-inline-start: 2px solid transparent;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--bx-on-light);
  transition: color 0.2s var(--bx-ease), border-color 0.2s var(--bx-ease);
}

.bx-toc__link:hover { color: var(--bx-jade); }

.bx-toc__link[aria-current="true"] {
  color: var(--bx-jade-deep);
  font-weight: 700;
  border-inline-start-color: var(--bx-coral);
}

/* ---------------- 响应式 ---------------- */
@media (min-width: 560px) {
  .bx-wrap { padding-inline: 28px; }
  .bx-footer__inner { padding: 60px 28px 28px; }
}

@media (min-width: 768px) {
  .bx-wrap { padding-inline: 36px; }
  .bx-footer__inner { padding: 64px 36px 30px; }
  .bx-footer__top { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.95fr); }
  .bx-footer__bottomnav { margin-inline-start: auto; }
}

@media (min-width: 1024px) {
  :root { --bx-rail-w: 236px; }

  body { padding-inline-start: var(--bx-rail-w); }

  .bx-header { position: static; }

  .bx-rail {
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    width: var(--bx-rail-w);
    height: 100dvh;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    min-height: 0;
    padding: 30px 22px 26px;
    overflow-y: auto;
    border-bottom: 0;
    border-inline-end: 1px solid var(--bx-line-light);
    background-image:
      radial-gradient(circle at 100% 100%, rgba(14, 124, 114, 0.5), transparent 62%),
      repeating-linear-gradient(115deg, rgba(199, 244, 100, 0.05) 0 1px, transparent 1px 17px);
  }

  .bx-brand { align-items: flex-start; }
  .bx-brand__mark { width: 46px; height: 46px; }
  .bx-brand__name { font-size: 21px; }
  .bx-brand__tag { display: block; margin-block-start: 3px; }

  .bx-burger { display: none; }

  .bx-nav {
    position: static;
    flex: 1 1 auto;
    min-height: 0;
    max-height: none;
    overflow: visible;
    padding: 0;
    margin-block-start: 34px;
    background: transparent;
    border: 0;
    box-shadow: none;
    visibility: visible;
    opacity: 1;
    transform: none;
  }

  .bx-nav__eyebrow {
    margin-block-end: 14px;
    padding-inline: 10px;
  }

  .bx-nav__foot {
    margin-block-start: auto;
    padding-block-start: 22px;
    border-block-start: 1px solid var(--bx-line-light);
  }

  .bx-progress {
    left: var(--bx-rail-w);
    right: auto;
    width: 3px;
    height: 100dvh;
    background: linear-gradient(180deg, var(--bx-lime), var(--bx-jade) 68%, transparent);
    transform: scaleY(var(--bx-scroll, 0));
    transform-origin: 50% 0;
  }

  .bx-toc { top: 26px; }
}

@media (min-width: 1200px) {
  :root { --bx-rail-w: 264px; }
  .bx-rail { padding: 34px 24px 28px; }
  .bx-footer__top { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr) minmax(0, 1.2fr); gap: 46px; }
}

/* ---------------- 减少动效 ---------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .bx-nav,
  .bx-burger__line,
  .bx-footer__cta { transform: none !important; }
}