/* =========================================================
   BY体育 · 共享站点样式表  /assets/site.css
   深墨蓝仪表盘 · 框架式导航 · 等宽数据排版
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --bg: #0B1B2B;
  --bg-2: #12293D;
  --bg-3: #0A1726;
  --line: #1F3B54;
  --line-2: #2C5170;
  --cyan: #2BE9C6;
  --orange: #FF7A2F;
  --violet: #6E5BFF;
  --gray: #8FA3B4;
  --white: #FFFFFF;
  --text: #E4EDF4;
  --green: #35D07F;
  --red: #FF4D5E;

  --font-head: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: 1220px;
  --header-h: 108px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --hard: 6px 6px 0 rgba(0, 0, 0, .45);
  --hard-cyan: 4px 4px 0 rgba(43, 233, 198, .22);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(31, 59, 84, .22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 59, 84, .22) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a { color: var(--cyan); text-decoration: none; }
a:hover { color: #7CF5DE; }

button { font: inherit; }

[hidden] { display: none !important; }

::selection { background: var(--cyan); color: #08131F; }

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

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0 0 .6em;
}

h1 { font-size: clamp(2.1rem, 5.2vw, 3.9rem); }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2.2vw, 1.5rem); }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

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

code, kbd, samp { font-family: var(--font-mono); font-size: .92em; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}

/* ---------- 4. 布局骨架 ---------- */
.shell,
.container {
  width: calc(100% - 2.5rem);
  max-width: var(--shell);
  margin-inline: auto;
}

.section { margin-block: clamp(2.5rem, 6vw, 5rem); }

.section-head {
  border-top: 2px solid var(--line);
  padding-top: 1.1rem;
  margin-bottom: clamp(1.2rem, 3vw, 2rem);
  position: relative;
}

.section-head::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 68px;
  height: 2px;
  background: var(--cyan);
}

.section-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
  margin-bottom: .45rem;
}

.section-title {
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  margin: 0 0 .35rem;
}

.section-lead {
  max-width: 62ch;
  color: var(--gray);
  font-size: 16px;
  margin: 0;
}

.rule-cyan {
  display: block;
  height: 2px;
  width: 100%;
  background: linear-gradient(90deg, var(--cyan), rgba(43, 233, 198, 0));
  border: 0;
}

.muted { color: var(--gray); }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 栅格 */
.grid {
  display: grid;
  gap: clamp(1rem, 2.2vw, 1.6rem);
}
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.layout-split {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  gap: clamp(1.5rem, 3vw, 2.6rem);
  align-items: start;
}
.layout-split--8 { grid-template-columns: minmax(0, 8fr) minmax(0, 2fr); }

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  transform: translateY(-130%);
  background: var(--cyan);
  color: #08131F;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 14px;
  padding: .65rem 1.1rem;
  border: 2px solid var(--cyan);
  transition: transform .18s var(--ease);
}
.skip-link:focus { transform: translateY(0); color: #08131F; }

/* ---------- 6. 页头（框架式导航） ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(11, 27, 43, .97);
  border-bottom: 2px solid var(--line);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header-inner { padding-block: 0; }

/* 状态条 */
.status-strip {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .48rem 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--gray);
  white-space: nowrap;
  overflow: hidden;
}

.status-dot {
  flex: none;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  border-radius: 50%;
  animation: by-pulse 2.1s ease-in-out infinite;
}

.status-text { overflow: hidden; text-overflow: ellipsis; }

.status-meta {
  margin-left: auto;
  padding-left: .9rem;
  border-left: 1px solid var(--line);
  color: var(--line-2);
  letter-spacing: .1em;
  flex: none;
}

@keyframes by-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(43, 233, 198, .55); }
  50% { opacity: .45; box-shadow: 0 0 0 6px rgba(43, 233, 198, 0); }
}

/* 主行 */
.header-main {
  display: flex;
  align-items: center;
  gap: clamp(.8rem, 2vw, 1.6rem);
  padding: .7rem 0 .75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  flex: none;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 2px solid var(--cyan);
  background: linear-gradient(140deg, rgba(43, 233, 198, .16), rgba(43, 233, 198, 0) 65%);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .02em;
  box-shadow: var(--hard-cyan);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }

.brand-name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  color: var(--white);
  letter-spacing: .01em;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--gray);
  text-transform: uppercase;
}

/* 导航 */
.nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list > li { position: relative; }

.nav-list > li + li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 13px;
  background: var(--line);
}

.nav-link {
  display: block;
  padding: .5rem .66rem;
  color: var(--gray);
  text-decoration: none;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .01em;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.nav-link:hover {
  color: var(--white);
  background: rgba(43, 233, 198, .07);
}

.nav-link[aria-current="page"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  background: rgba(43, 233, 198, .08);
}

/* 行动区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex: none;
  margin-left: .4rem;
}

/* 移动开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  background: transparent;
  border: 2px solid var(--line-2);
  color: var(--white);
  padding: .5rem .7rem;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle-icon {
  position: relative;
  width: 16px;
  height: 12px;
}
.nav-toggle-icon span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform .22s var(--ease), opacity .18s var(--ease);
}
.nav-toggle-icon span:nth-child(1) { top: 0; }
.nav-toggle-icon span:nth-child(2) { top: 5px; }
.nav-toggle-icon span:nth-child(3) { top: 10px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 进度线 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 3px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) 50%, var(--orange) 100%);
  pointer-events: none;
  will-change: transform;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .72rem 1.15rem;
  border: 2px solid transparent;
  background: transparent;
  color: var(--white);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
  line-height: 1.2;
  letter-spacing: .01em;
  text-decoration: none;
  cursor: pointer;
  transition: transform .18s var(--ease), background-color .18s var(--ease),
              color .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.btn:hover { transform: translate(-1px, -2px); }

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #101820;
  box-shadow: 4px 4px 0 rgba(255, 122, 47, .25);
}
.btn--primary:hover {
  background: #FF9152;
  border-color: #FF9152;
  color: #101820;
  box-shadow: 6px 6px 0 rgba(255, 122, 47, .32);
}

.btn--ghost {
  border-color: var(--line-2);
  color: var(--white);
}
.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(43, 233, 198, .07);
}

.btn--dark {
  background: var(--bg-2);
  border-color: var(--line);
  color: var(--white);
}
.btn--dark:hover { border-color: var(--line-2); color: var(--cyan); }

.btn--sm { padding: .5rem .8rem; font-size: 13.5px; }
.btn--block { width: 100%; }

/* ---------- 8. 通用组件 ---------- */
/* 面包屑 */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gray);
  margin-bottom: 1.2rem;
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.breadcrumbs li { display: inline-flex; align-items: center; }
.breadcrumbs li + li::before {
  content: "/";
  margin-right: .45rem;
  color: var(--line-2);
}
.breadcrumbs a { color: var(--gray); text-decoration: none; }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs [aria-current="page"] { color: var(--white); }

/* 面板 */
.panel {
  position: relative;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--line-2);
  padding: clamp(1.05rem, 2.4vw, 1.7rem);
}
.panel--accent { border-top-color: var(--cyan); }
.panel--warn { border-top-color: var(--orange); }
.panel--violet { border-top-color: var(--violet); }
.panel--hard { box-shadow: var(--hard); }

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .8rem;
  margin-bottom: .9rem;
}

.panel-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--white);
  margin: 0;
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .26rem .55rem;
  border: 1px solid var(--line-2);
  color: var(--gray);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  white-space: nowrap;
}
.tag--cyan { color: var(--cyan); border-color: rgba(43, 233, 198, .5); background: rgba(43, 233, 198, .08); }
.tag--orange { color: var(--orange); border-color: rgba(255, 122, 47, .5); background: rgba(255, 122, 47, .08); }
.tag--violet { color: #A79CFF; border-color: rgba(110, 91, 255, .55); background: rgba(110, 91, 255, .12); }
.tag--green { color: var(--green); border-color: rgba(53, 208, 127, .5); background: rgba(53, 208, 127, .08); }
.tag--red { color: var(--red); border-color: rgba(255, 77, 94, .5); background: rgba(255, 77, 94, .08); }

/* 等宽指标 */
.stat {
  border-left: 3px solid var(--cyan);
  padding-left: .85rem;
}
.stat-value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  line-height: 1.05;
  color: var(--white);
  letter-spacing: -.02em;
}
.stat-unit {
  font-family: var(--font-mono);
  font-size: .78em;
  color: var(--gray);
  margin-left: .2em;
  letter-spacing: .06em;
}
.stat-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gray);
  margin-top: .35rem;
}

/* 图片容器 */
.figure {
  position: relative;
  margin: 0;
  background: var(--bg-2);
  border: 1px solid var(--line);
  overflow: hidden;
}

.figure-media {
  position: relative;
  aspect-ratio: 16 / 9;
  background-color: #0E2133;
  background-image:
    linear-gradient(rgba(43, 233, 198, .10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 233, 198, .10) 1px, transparent 1px);
  background-size: 28px 28px;
  overflow: hidden;
}

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

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

.figure-caption {
  padding: .55rem .8rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .07em;
  color: var(--gray);
}

/* 章节目录 */
.toc {
  position: sticky;
  top: calc(var(--header-h) + 1.5rem);
}
.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.toc-link {
  display: block;
  padding: .5rem .2rem .5rem .85rem;
  border-left: 2px solid var(--line);
  color: var(--gray);
  font-size: 14.5px;
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}
.toc-link:hover { color: var(--white); border-left-color: var(--line-2); }
.toc-link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(43, 233, 198, .06);
}

/* 返回顶部（由 JS 生成） */
.back-to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 50;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  padding: 0;
  background: var(--bg-2);
  border: 2px solid var(--line-2);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 16px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .22s var(--ease), transform .22s var(--ease),
              visibility .22s var(--ease), border-color .18s var(--ease);
}
.back-to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.back-to-top:hover { border-color: var(--cyan); }

/* 显现 */
@media (prefers-reduced-motion: no-preference) {
  [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity .5s var(--ease), transform .5s var(--ease);
  }
  [data-reveal][data-revealed] {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  background: var(--bg-3);
  border-top: 2px solid var(--line);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 130px;
  height: 2px;
  background: var(--cyan);
}

.site-footer .shell { padding-block: clamp(2.4rem, 5vw, 3.8rem) 1.6rem; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: clamp(1.5rem, 3, 3rem);
  gap: clamp(1.5rem, 3vw, 3rem);
}

.footer-brand { padding-right: 1rem; }

.footer-mark {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.2vw, 2.1rem);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--white);
  margin: 0 0 .5rem;
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gray);
  margin: 0 0 1.4rem;
}

.footer-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .55rem;
}

.footer-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: .6rem;
  align-items: baseline;
  border-top: 1px solid var(--line);
  padding-top: .55rem;
  font-size: 14px;
}

.footer-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gray);
}

.footer-value {
  color: var(--text);
  word-break: break-word;
}

.footer-title {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gray);
  margin: 0 0 .85rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--line);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  display: block;
  padding: .32rem 0 .32rem .9rem;
  position: relative;
  color: #B7C7D4;
  font-size: 14.5px;
  text-decoration: none;
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}

.footer-links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 1px;
  background: var(--line-2);
  transition: background-color .18s var(--ease), width .18s var(--ease);
}

.footer-links a:hover {
  color: var(--cyan);
  padding-left: 1.1rem;
}
.footer-links a:hover::before {
  background: var(--cyan);
  width: 10px;
}

.footer-bottom {
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: .6rem 1.5rem;
  align-items: flex-start;
  justify-content: space-between;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--gray);
  margin: 0;
}

.footer-note {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--line-2);
  max-width: 54ch;
  margin: 0;
}

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }

  .nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    left: 0;
    margin: 0;
    padding: 1.25rem 1.25rem 3rem;
    background: var(--bg);
    border-top: 2px solid var(--line);
    overflow-y: auto;
    z-index: 55;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s var(--ease);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-list > li + li::before { display: none; }

  .nav-link {
    padding: .95rem .3rem;
    font-size: 17px;
    border-bottom: 1px solid var(--line);
    border-left: 3px solid transparent;
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: var(--line);
    border-left-color: var(--cyan);
    padding-left: .9rem;
  }
}

@media (max-width: 900px) {
  .grid-3,
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .layout-split,
  .layout-split--8 { grid-template-columns: minmax(0, 1fr); }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; padding-right: 0; }

  .toc { position: static; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }

  .shell,
  .container { width: calc(100% - 1.5rem); }

  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: minmax(0, 1fr); }

  .status-meta { display: none; }
  .status-strip { font-size: 10.5px; letter-spacing: .08em; }

  .brand-sub { display: none; }
  .brand-mark { width: 36px; height: 36px; font-size: 13px; }

  .header-actions .btn--ghost { display: none; }

  .footer-grid { grid-template-columns: minmax(0, 1fr); }

  .footer-bottom { flex-direction: column; }

  .back-to-top { width: 42px; height: 42px; }
}

/* ---------- 11. 降低动效 ---------- */
@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;
  }

  .status-dot { animation: none; }
  [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress { transition: none; }
}