/* ==========================================================================
   半岛体育看台 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用按钮与基础组件
   ========================================================================== */

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

html {
  margin: 0;
  padding: 0;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ol, ul {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

a { color: inherit; }

/* --- 变量 ----------------------------------------------------------------- */
:root {
  --ink: #0A1A33;
  --ink-deep: #050D1C;
  --paper: #F3EBDD;
  --paper-lite: #FFFCF6;
  --lava: #FF5A1F;
  --lava-deep: #B93B0C;
  --cyan: #1FD3E8;
  --cyan-deep: #0E6B78;
  --signal: #FFC531;
  --graphite: #39415A;
  --mist: #C7C0B2;

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Naskh Arabic", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular,
    Menlo, Consolas, "Courier New", monospace;

  --fs-12: 0.75rem;
  --fs-14: 0.875rem;
  --fs-17: 1.0625rem;
  --fs-22: 1.375rem;
  --fs-30: 1.875rem;
  --fs-44: 2.75rem;
  --fs-64: 4rem;

  --header-h: 72px;
  --edge-w: 36px;
  --container: 1180px;
  --rule: 2px;
  --shadow-hard: 6px 6px 0 rgba(10, 26, 51, 0.16);
  --shadow-hard-hover: 8px 8px 0 rgba(10, 26, 51, 0.22);
  --shadow-bar: 0 10px 26px rgba(5, 13, 28, 0.42);
  --t-fast: 160ms;
  --t: 200ms;
}

/* --- 中文排版基线 ---------------------------------------------------------- */
html { scroll-padding-top: calc(var(--header-h) + 16px); }

body {
  font-family: var(--font-sans);
  font-size: var(--fs-17);
  line-height: 1.75;
  font-weight: 400;
  color: var(--graphite);
  background-color: var(--paper);
  padding-top: var(--header-h);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.bd-main {
  display: block;
  min-height: 60vh;
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

strong, b { font-weight: 700; color: var(--ink); }

::selection {
  background: var(--lava);
  color: #FFFFFF;
}

/* --- 焦点可见 -------------------------------------------------------------- */
:focus { outline: none; }

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

.bd-band :focus-visible,
.bd-footer :focus-visible {
  outline-color: var(--cyan);
}

/* --- 跳转链接 -------------------------------------------------------------- */
.bd-skip {
  position: absolute;
  left: 14px;
  top: -80px;
  z-index: 999;
  display: inline-block;
  padding: 10px 16px;
  background: var(--signal);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-radius: 2px;
  border: var(--rule) solid var(--ink);
  transition: top var(--t-fast) linear;
}

.bd-skip:focus {
  top: 14px;
}

/* --- 容器 ----------------------------------------------------------------- */
.bd-container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 32px);
}

/* ==========================================================================
   页头框架条
   ========================================================================== */
.bd-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 200;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 1px solid rgba(199, 192, 178, 0.26);
  transition: box-shadow var(--t) linear, border-color var(--t) linear;
}

.bd-header.is-scrolled {
  box-shadow: var(--shadow-bar);
  border-bottom-color: rgba(255, 90, 31, 0.5);
}

.bd-header__bar {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  height: var(--header-h);
}

/* 品牌 */
.bd-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  padding-right: clamp(10px, 1.6vw, 22px);
  border-right: 1px solid rgba(199, 192, 178, 0.26);
  text-decoration: none;
  color: var(--paper-lite);
}

.bd-brand__mark {
  display: inline-flex;
  align-items: flex-end;
  gap: 3px;
  height: 24px;
}

.bd-brand__tick {
  display: block;
  width: 4px;
  background: var(--lava);
  transform: skewX(-12deg);
}

.bd-brand__tick:nth-child(1) { height: 10px; opacity: 0.65; }
.bd-brand__tick:nth-child(2) { height: 17px; background: var(--signal); opacity: 0.85; }
.bd-brand__tick:nth-child(3) { height: 24px; background: var(--cyan); }

.bd-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.18;
}

.bd-brand__name {
  font-size: var(--fs-17);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper-lite);
}

.bd-brand__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* 导航 */
.bd-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.bd-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0px, 0.6vw, 8px);
  flex-wrap: nowrap;
}

.bd-nav__link {
  position: relative;
  display: block;
  padding: 8px 10px;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: color var(--t-fast) linear, border-color var(--t-fast) linear,
    background-color var(--t-fast) linear;
}

.bd-nav__link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 3px;
  height: 2px;
  background: var(--lava);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-fast) linear;
}

.bd-nav__link:hover {
  color: #FFFFFF;
  background: rgba(243, 235, 221, 0.06);
}

.bd-nav__link:hover::after {
  transform: scaleX(1);
}

.bd-nav__link[aria-current="page"] {
  color: var(--signal);
  border-color: rgba(255, 197, 49, 0.42);
}

.bd-nav__link[aria-current="page"]::after {
  background: var(--signal);
  transform: scaleX(1);
}

.bd-nav__cta {
  display: none;
}

/* 右侧入口 */
.bd-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  margin-left: auto;
}

/* 通用按钮 */
.bd-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 14px;
  font-family: var(--font-sans);
  font-size: var(--fs-14);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
  border: var(--rule) solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color var(--t-fast) linear, color var(--t-fast) linear,
    border-color var(--t-fast) linear, transform var(--t-fast) linear,
    box-shadow var(--t-fast) linear;
}

.bd-btn--live {
  background: var(--lava);
  border-color: var(--lava);
  color: #FFFFFF;
  box-shadow: 3px 3px 0 rgba(255, 90, 31, 0.28);
}

.bd-btn--live:hover {
  background: var(--lava-deep);
  border-color: var(--lava-deep);
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 rgba(255, 90, 31, 0.3);
}

.bd-btn--ghost {
  background: transparent;
  border-color: rgba(243, 235, 221, 0.48);
  color: var(--paper-lite);
}

.bd-btn--ghost:hover {
  border-color: var(--paper-lite);
  background: rgba(243, 235, 221, 0.1);
}

/* 移动导航按钮 */
.bd-nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 8px 12px;
  background: transparent;
  border: var(--rule) solid rgba(243, 235, 221, 0.44);
  border-radius: 2px;
  color: var(--paper-lite);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: border-color var(--t-fast) linear, background-color var(--t-fast) linear;
}

.bd-nav-toggle:hover {
  border-color: var(--lava);
  background: rgba(255, 90, 31, 0.12);
}

.bd-nav-toggle__bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color var(--t-fast) linear;
}

.bd-nav-toggle__bars::before,
.bd-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--t-fast) linear;
}

.bd-nav-toggle__bars::before { top: -5px; }
.bd-nav-toggle__bars::after { top: 5px; }

.bd-nav-toggle[aria-expanded="true"] .bd-nav-toggle__bars {
  background: transparent;
}

.bd-nav-toggle[aria-expanded="true"] .bd-nav-toggle__bars::before {
  transform: translateY(5px) rotate(45deg);
}

.bd-nav-toggle[aria-expanded="true"] .bd-nav-toggle__bars::after {
  transform: translateY(-5px) rotate(-45deg);
}

/* 框架条下的刻度线与阅读进度 */
.bd-header__rule {
  position: relative;
  height: 3px;
  background-color: rgba(199, 192, 178, 0.18);
  background-image: repeating-linear-gradient(
    to right,
    rgba(243, 235, 221, 0.3) 0 1px,
    transparent 1px 34px
  );
  overflow: hidden;
}

.bd-progress {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--signal) 42%, var(--lava) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 100ms linear;
}

/* --- 两侧刻度轨（宽屏） ---------------------------------------------------- */
.bd-edge {
  position: fixed;
  top: var(--header-h);
  bottom: 0;
  width: var(--edge-w);
  z-index: 150;
  display: none;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(10, 26, 51, 0.22) 0 1px,
    transparent 1px 24px
  );
}

.bd-edge--left {
  left: 0;
  border-right: 1px solid rgba(10, 26, 51, 0.08);
}

.bd-edge--right {
  right: 0;
  border-left: 1px solid rgba(10, 26, 51, 0.08);
}

.bd-edge__marker {
  position: absolute;
  left: 8px;
  top: 0;
  width: 6px;
  height: 20px;
  background: var(--lava);
  border-radius: 1px;
  box-shadow: 0 0 0 1px rgba(255, 90, 31, 0.35);
  transform: translateY(-10px);
  transition: top 100ms linear;
}

@media (min-width: 1320px) {
  .bd-edge { display: block; }
}

/* ==========================================================================
   通用排版与内容组件
   ========================================================================== */
.bd-section {
  padding-block: clamp(44px, 7vw, 96px);
}

.bd-band {
  background: var(--ink);
  color: var(--paper);
  border-top: 3px solid var(--lava);
}

.bd-band .bd-h1,
.bd-band .bd-h2,
.bd-band .bd-h3 { color: var(--paper-lite); }

.bd-band p,
.bd-band .bd-lead { color: var(--mist); }

.bd-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lava-deep);
}

.bd-eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: currentColor;
}

.bd-eyebrow--on-dark {
  color: var(--signal);
}

.bd-h1 {
  font-size: clamp(2rem, 5.2vw, var(--fs-64));
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 18px;
}

.bd-h2 {
  font-size: clamp(1.5rem, 3vw, var(--fs-44));
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 16px;
}

.bd-h3 {
  font-size: var(--fs-22);
  font-weight: 900;
  line-height: 1.34;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 10px;
}

.bd-lead {
  max-width: 48ch;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.8;
  color: var(--graphite);
  margin-bottom: 22px;
}

.bd-prose {
  max-width: 38em;
}

.bd-prose p {
  margin-bottom: 1.2em;
}

.bd-prose h3 {
  margin-top: 1.6em;
  margin-bottom: 0.6em;
}

.bd-index {
  font-family: var(--font-mono);
  font-size: var(--fs-22);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.bd-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--graphite);
  background: var(--paper-lite);
  border: 1px solid var(--mist);
  border-radius: 2px;
}

.bd-tag--live {
  color: #FFFFFF;
  background: var(--lava);
  border-color: var(--lava);
}

.bd-tag--time {
  color: var(--ink);
  background: var(--signal);
  border-color: var(--signal);
}

.bd-tag--data {
  color: var(--cyan-deep);
  background: transparent;
  border-color: var(--cyan);
}

.bd-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--paper-lite);
  border: var(--rule) solid var(--ink);
  border-radius: 2px;
  box-shadow: var(--shadow-hard);
  transition: box-shadow var(--t-fast) linear, transform var(--t-fast) linear;
}

.bd-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard-hover);
}

.bd-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.bd-grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.bd-grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(238px, 1fr));
}

/* 图片容器（共享基础规则，页面阶段放置 <img> 即可） */
.bd-media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: var(--rule) solid var(--ink);
  border-radius: 2px;
  background-color: var(--ink);
  background-image:
    linear-gradient(122deg, var(--ink) 0%, #12305A 52%, var(--lava) 128%),
    repeating-linear-gradient(
      to right,
      rgba(255, 255, 255, 0.12) 0 1px,
      transparent 1px 40px
    );
}

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

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

.bd-media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 5px 10px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.bd-breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--graphite);
}

.bd-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
}

.bd-breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.bd-breadcrumb li + li::before {
  content: "/";
  margin: 0 9px;
  color: var(--mist);
}

.bd-breadcrumb a {
  color: var(--graphite);
  text-decoration: none;
  border-bottom: 1px solid var(--mist);
  transition: color var(--t-fast) linear, border-color var(--t-fast) linear;
}

.bd-breadcrumb a:hover {
  color: var(--lava-deep);
  border-bottom-color: var(--lava-deep);
}

.bd-breadcrumb [aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

.bd-diagonal {
  height: clamp(14px, 2.6vw, 28px);
  background: linear-gradient(
    102deg,
    var(--lava) 0 58%,
    var(--signal) 58% 78%,
    var(--cyan) 78% 100%
  );
  clip-path: polygon(0 0, 100% 0, calc(100% - 30px) 100%, 0 100%);
}

/* --- 返回顶部 -------------------------------------------------------------- */
.bd-backtop {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 180;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--ink);
  color: var(--paper-lite);
  border: var(--rule) solid var(--ink);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: 4px 4px 0 rgba(10, 26, 51, 0.22);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--t) linear, transform var(--t) linear,
    visibility var(--t) linear, background-color var(--t-fast) linear,
    border-color var(--t-fast) linear;
}

.bd-backtop[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.bd-backtop:hover {
  background: var(--lava);
  border-color: var(--lava);
}

/* ==========================================================================
   页脚
   ========================================================================== */
.bd-footer {
  position: relative;
  background: var(--ink-deep);
  color: var(--paper);
  border-top: 3px solid var(--lava);
  padding-top: clamp(40px, 6vw, 76px);
}

.bd-footer::after {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--lava) 0 62%,
    var(--signal) 62% 79%,
    var(--cyan) 79% 100%
  );
}

.bd-footer__grid {
  display: grid;
  grid-template-columns: minmax(220px, 1.5fr) repeat(3, minmax(140px, 1fr));
  gap: clamp(24px, 4vw, 52px);
  padding-bottom: clamp(30px, 4vw, 52px);
}

.bd-footer__mark {
  font-size: var(--fs-22);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper-lite);
  margin-bottom: 8px;
}

.bd-footer__line {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--mist);
  margin-bottom: 14px;
}

.bd-footer__domain {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--signal);
  border: 1px solid rgba(255, 197, 49, 0.42);
  border-radius: 2px;
  margin-bottom: 12px;
}

.bd-footer__coords {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(199, 192, 178, 0.75);
  margin: 0;
}

.bd-footer__title {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(199, 192, 178, 0.22);
}

.bd-footer__list {
  display: grid;
  gap: 11px;
}

.bd-footer__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.02em;
  color: var(--paper);
  text-decoration: none;
  transition: color var(--t-fast) linear, transform var(--t-fast) linear;
}

.bd-footer__link::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 1px;
  background: var(--mist);
  transition: width var(--t-fast) linear, background-color var(--t-fast) linear;
}

.bd-footer__link:hover {
  color: var(--cyan);
  transform: translateX(2px);
}

.bd-footer__link:hover::before {
  width: 18px;
  background: var(--lava);
}

.bd-footer__contact {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 34px;
  padding-block: 20px;
  border-top: 1px solid rgba(199, 192, 178, 0.2);
  border-bottom: 1px solid rgba(199, 192, 178, 0.2);
}

.bd-footer__crow {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.03em;
  color: var(--mist);
}

.bd-footer__k {
  color: rgba(199, 192, 178, 0.62);
}

.bd-footer__k::after {
  content: "｜";
  margin-left: 2px;
  color: rgba(199, 192, 178, 0.4);
}

.bd-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 22px 28px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--mist);
}

.bd-footer__legal,
.bd-footer__copy {
  margin: 0;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1180px) {
  .bd-actions { display: none; }

  .bd-nav-toggle { display: inline-flex; }

  .bd-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    padding: 16px clamp(16px, 4vw, 28px) 26px;
    background: var(--ink-deep);
    border-bottom: 3px solid var(--lava);
    box-shadow: 0 18px 36px rgba(5, 13, 28, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 180ms linear, transform 180ms linear, visibility 180ms linear;
  }

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

  .bd-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .bd-nav__link {
    padding: 14px 12px;
    font-size: 1rem;
    border-bottom: 1px solid rgba(199, 192, 178, 0.18);
    border-radius: 0;
  }

  .bd-nav__link::after { display: none; }

  .bd-nav__link:hover { background: rgba(243, 235, 221, 0.06); }

  .bd-nav__link[aria-current="page"] {
    border-color: transparent;
    border-bottom-color: rgba(199, 192, 178, 0.18);
    box-shadow: inset 3px 0 0 var(--signal);
    background: rgba(255, 197, 49, 0.07);
  }

  .bd-nav__cta {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 22px;
  }

  .bd-nav__cta .bd-btn {
    width: 100%;
    padding: 13px 16px;
    font-size: 0.9375rem;
  }
}

@media (max-width: 900px) {
  :root {
    --header-h: 62px;
  }

  .bd-brand__sub { display: none; }

  .bd-brand {
    border-right: 0;
    padding-right: 0;
  }

  .bd-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .bd-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  body { font-size: 1rem; }

  .bd-footer__grid {
    grid-template-columns: 1fr;
  }

  .bd-footer__brand {
    grid-column: auto;
  }

  .bd-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .bd-backtop {
    right: 12px;
    bottom: 12px;
    padding: 9px 12px;
  }
}

@media (max-width: 400px) {
  .bd-nav-toggle__label { display: none; }

  .bd-nav-toggle { padding: 9px 11px; }
}

/* ==========================================================================
   动效降级
   ========================================================================== */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .bd-card:hover { transform: none; }
  .bd-footer__link:hover { transform: none; }
}