/* ============================================================
   B体育 — 共享外壳样式 / VELOCITY TERMINAL
   深空黑 · 荧光绿 · 电光蓝 · 橙红
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  --bg-void: #0A0E16;
  --bg-panel: #1B2333;
  --neon: #39FF14;
  --volt: #00BFFF;
  --flare: #FF4500;
  --ink: #E6F0FF;
  --muted: #7A8699;
  --pure: #FFFFFF;

  --font-display: 'Anton', 'Impact', 'Arial Black', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif;
  --font-data: 'Roboto Mono', 'Consolas', 'Courier New', monospace;

  --shell-max: 1440px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --header-h: 76px;

  --line: rgba(230, 240, 255, 0.12);
  --line-bright: rgba(57, 255, 20, 0.35);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-fast: 240ms var(--ease);
  --ease-mid: 420ms var(--ease);

  --z-nav: 99;
  --z-header: 100;
  --z-progress: 101;
  --z-skip: 200;
}

@media (max-width: 600px) {
  :root { --header-h: 64px; }
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  background: var(--bg-void);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

main { display: block; }

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

button { font: inherit; color: inherit; border: 0; cursor: pointer; }
a { color: var(--volt); }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; }
p { text-wrap: pretty; }

/* ---------- 中文版式 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.12;
  color: var(--pure);
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(1.875rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.375rem, 2.5vw, 1.75rem); }
h4 { font-size: clamp(1.125rem, 1.8vw, 1.25rem); }

.data-num {
  font-family: var(--font-data);
  font-weight: 700;
  color: var(--neon);
  letter-spacing: -0.01em;
}

.data-label {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 布局容器 ---------- */
.shell {
  display: block;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.main-content {
  display: block;
  min-height: 65vh;
  outline: none;
  scroll-margin-top: calc(var(--header-h) + 16px);
}

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

.section-block + .section-block {
  border-top: 1px solid var(--line);
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: var(--z-skip);
  background: var(--neon);
  color: var(--bg-void);
  padding: 10px 20px;
  border-radius: 4px;
  font-weight: 700;
  text-decoration: none;
  transition: top var(--ease-fast);
}

.skip-link:focus {
  top: 16px;
  outline: none;
  box-shadow: 0 0 0 4px rgba(0, 191, 255, 0.5);
}

/* ---------- 顶部信号带 / 阅读进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: var(--z-progress);
  background: rgba(57, 255, 20, 0.12);
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--neon) 0%, var(--volt) 100%);
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.7);
  transition: width 180ms linear;
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(10, 14, 22, 0.92);
  border-bottom: 1px solid var(--line);
  transition: background var(--ease-fast), border-color var(--ease-fast), box-shadow var(--ease-fast);
}

.site-header[data-scrolled] {
  background: rgba(10, 14, 22, 0.88);
  border-bottom-color: rgba(57, 255, 20, 0.18);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

@media (min-width: 901px) {
  .site-header[data-scrolled] {
    background: rgba(10, 14, 22, 0.72);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
  }
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: var(--header-h);
}

/* ---------- 品牌标志 ---------- */
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-mark__badge {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--neon);
  color: var(--bg-void);
  font-family: var(--font-display);
  font-size: 1.75rem;
  line-height: 1;
  border-radius: 4px;
  transform: skewX(-10deg);
  box-shadow: 4px 4px 0 rgba(0, 191, 255, 0.45);
}

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

.brand-mark__title {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--pure);
  line-height: 1;
}

.brand-mark__sub {
  margin-top: 3px;
  font-family: var(--font-data);
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.brand-mark--footer .brand-mark__badge {
  width: 36px;
  height: 36px;
  font-size: 1.5rem;
}

.brand-mark--footer .brand-mark__title {
  font-size: 1.25rem;
}

/* ---------- 桌面导航 ---------- */
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 15px;
  color: var(--ink);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: color var(--ease-fast);
}

.site-nav__link::before {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 4px;
  height: 2px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--ease-fast);
}

.site-nav__link:hover { color: var(--neon); }

.site-nav__link:hover::before,
.site-nav__link[aria-current="page"]::before {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  color: var(--pure);
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink);
  font-size: 0.875rem;
  line-height: 1;
  transition: color var(--ease-fast), border-color var(--ease-fast), background var(--ease-fast);
}

.nav-toggle:hover {
  color: var(--neon);
  border-color: var(--line-bright);
  background: rgba(57, 255, 20, 0.06);
}

.nav-toggle__icon {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--ease-fast), opacity var(--ease-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.nav-toggle__text {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

/* ---------- 移动抽屉导航 ---------- */
@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    width: min(84vw, 380px);
    z-index: var(--z-nav);
    overflow-y: auto;
    background: rgba(10, 14, 22, 0.97);
    border-left: 1px solid var(--line);
    border-top: 3px solid rgba(57, 255, 20, 0.3);
    padding: 32px var(--gutter) 64px;
    transform: translateX(105%);
    visibility: hidden;
    transition: transform var(--ease-mid), visibility var(--ease-mid);
  }

  .site-nav[data-open="true"] {
    transform: translateX(0);
    visibility: visible;
  }

  .site-nav::before {
    content: "INDEX / 导航";
    display: block;
    margin-bottom: 36px;
    font-family: var(--font-data);
    font-size: 0.75rem;
    letter-spacing: 0.3em;
    color: var(--neon);
  }

  .site-nav::after {
    content: "DATA STATION · CHENGDU";
    display: block;
    position: absolute;
    bottom: 32px;
    left: var(--gutter);
    font-family: var(--font-data);
    font-size: 0.625rem;
    letter-spacing: 0.25em;
    color: var(--muted);
  }

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

  .site-nav__item { border-bottom: 1px solid var(--line); }

  .site-nav__link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 4px;
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: 900;
    letter-spacing: 0.04em;
    color: var(--ink);
  }

  .site-nav__link::before { display: none; }

  .site-nav__link::after {
    content: "";
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--muted);
    border-top: 2px solid var(--muted);
    transform: rotate(45deg);
    transition: border-color var(--ease-fast), transform var(--ease-fast);
  }

  .site-nav__link:hover::after {
    border-color: var(--neon);
    transform: rotate(45deg) translate(-3px, 3px);
  }

  .site-nav__link[aria-current="page"] { color: var(--neon); }
  .site-nav__link[aria-current="page"]::after { border-color: var(--neon); }
}

body[data-nav-locked] {
  overflow: hidden;
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 26px;
  background: var(--neon);
  color: var(--bg-void);
  border: 1px solid transparent;
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: transform var(--ease-fast), box-shadow var(--ease-fast), background var(--ease-fast), color var(--ease-fast);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(57, 255, 20, 0.22);
}

.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: 2px solid var(--volt); outline-offset: 3px; }

.btn--ghost {
  background: transparent;
  color: var(--volt);
  border-color: var(--volt);
}

.btn--ghost:hover {
  background: rgba(0, 191, 255, 0.08);
  color: var(--pure);
  box-shadow: 0 10px 28px rgba(0, 191, 255, 0.15);
}

.btn--sm {
  min-height: 36px;
  padding: 8px 16px;
  font-size: 0.8125rem;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding-block: 18px 8px;
  font-size: 0.8125rem;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 4px;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--muted);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 4px;
  font-family: var(--font-data);
  color: var(--muted);
  opacity: 0.5;
}

.breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--ease-fast);
}

.breadcrumb__link:hover { color: var(--volt); }

.breadcrumb__item[aria-current="page"] {
  color: var(--neon);
  font-weight: 600;
}

/* ---------- 栅格系统 ---------- */
.grid-6,
.grid-4,
.grid-2 {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid-6 { grid-template-columns: repeat(6, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.col-span-2 { grid-column: span 2; }
.col-span-3 { grid-column: span 3; }
.col-span-4 { grid-column: span 4; }
.col-span-5 { grid-column: span 5; }

@media (max-width: 900px) {
  .grid-6,
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  .col-span-2,
  .col-span-3,
  .col-span-4,
  .col-span-5 { grid-column: span 1; }
}

@media (max-width: 600px) {
  .grid-6,
  .grid-4,
  .grid-2 { grid-template-columns: 1fr; }

  .col-span-2,
  .col-span-3,
  .col-span-4,
  .col-span-5 { grid-column: span 1; }
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  background: rgba(27, 35, 51, 0.5);
  border: 1px solid var(--line);
  border-radius: 3px;
  white-space: nowrap;
}

.tag::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 6px currentColor;
}

.tag--live {
  color: var(--neon);
  border-color: rgba(57, 255, 20, 0.35);
  background: rgba(57, 255, 20, 0.06);
}

.tag--data {
  color: var(--volt);
  border-color: rgba(0, 191, 255, 0.35);
  background: rgba(0, 191, 255, 0.06);
}

.tag--hot {
  color: var(--flare);
  border-color: rgba(255, 69, 0, 0.35);
  background: rgba(255, 69, 0, 0.06);
}

/* ---------- 数据卡片 ---------- */
.panel-card {
  position: relative;
  padding: clamp(24px, 4vw, 36px);
  background: linear-gradient(150deg, rgba(27, 35, 51, 0.92) 0%, rgba(10, 14, 22, 0.85) 100%);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color var(--ease-fast), transform var(--ease-fast), box-shadow var(--ease-fast);
}

.panel-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18%;
  right: 18%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--volt), transparent);
  opacity: 0;
  transition: opacity var(--ease-fast);
}

.panel-card:hover {
  border-color: var(--line-bright);
  transform: translateY(-3px);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.3);
}

.panel-card:hover::before { opacity: 1; }

/* ---------- 数据矩阵 ---------- */
.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}

.data-cell {
  background: var(--bg-void);
  padding: 18px 20px;
}

.data-cell__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.data-cell__value {
  display: block;
  font-family: var(--font-data);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--neon);
}

/* ---------- 编辑部索引 ---------- */
.index-list {
  border-top: 1px solid var(--line);
}

.index-list__item {
  border-bottom: 1px solid var(--line);
}

.index-list__link {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 16px 8px;
  color: var(--ink);
  text-decoration: none;
  transition: color var(--ease-fast), padding-left var(--ease-fast);
}

.index-list__link:hover {
  color: var(--volt);
  padding-left: 18px;
}

.index-list__num {
  flex-shrink: 0;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.index-list__title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: inherit;
}

/* ---------- 旁注 / 导读 ---------- */
.callout {
  position: relative;
  padding: 18px 22px 18px 26px;
  background: rgba(57, 255, 20, 0.05);
  border-left: 3px solid var(--neon);
  border-radius: 0 6px 6px 0;
  font-size: 0.9375rem;
  line-height: 1.7;
}

.callout--blue {
  background: rgba(0, 191, 255, 0.05);
  border-left-color: var(--volt);
}

.callout--hot {
  background: rgba(255, 69, 0, 0.05);
  border-left-color: var(--flare);
}

/* ---------- 影像框架 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  aspect-ratio: 16 / 9;
}

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

.media-frame::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-style: solid;
  border-width: 0 26px 26px 0;
  border-color: transparent rgba(0, 191, 255, 0.55) transparent transparent;
  opacity: 0.7;
  transition: opacity var(--ease-fast);
}

.media-frame:hover::after { opacity: 1; }

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 斜切分隔线 ---------- */
.divider-slash {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 10px;
}

.divider-slash::before {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line), var(--line-bright));
}

.divider-slash::after {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--neon);
  transform: rotate(45deg);
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.5);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  background:
    radial-gradient(ellipse at 78% -18%, rgba(0, 191, 255, 0.08), transparent 52%),
    linear-gradient(180deg, rgba(27, 35, 51, 0.5) 0%, rgba(10, 14, 22, 0.96) 46%);
  border-top: 1px solid rgba(57, 255, 20, 0.18);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(48%, 620px);
  height: 3px;
  background: linear-gradient(90deg, var(--neon), rgba(0, 191, 255, 0.4) 70%, transparent);
  opacity: 0.85;
}

.site-footer__inner {
  padding-top: clamp(2.5rem, 5vw, 4rem);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.3fr;
  gap: clamp(28px, 4.5vw, 64px);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--line);
}

.site-footer__cell { min-width: 0; }

.site-footer__desc {
  max-width: 38ch;
  margin-top: 18px;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

.site-footer__icp {
  margin-top: 18px;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.site-footer__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
  padding-bottom: 10px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--volt);
  border-bottom: 1px solid var(--line);
}

.site-footer__title::before {
  content: "//";
  font-family: var(--font-data);
  color: var(--neon);
}

.site-footer__list li { line-height: 1; }

.site-footer__link {
  display: inline-block;
  padding-block: 6px;
  font-size: 0.9375rem;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--ease-fast), transform var(--ease-fast);
}

.site-footer__link:hover {
  color: var(--volt);
  transform: translateX(4px);
}

.site-footer__docs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.site-footer__doc-link {
  padding: 7px 12px;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 3px;
  transition: border-color var(--ease-fast), color var(--ease-fast);
}

.site-footer__doc-link:hover {
  color: var(--volt);
  border-color: rgba(0, 191, 255, 0.4);
}

.site-footer__contact-list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding-block: 11px;
  border-bottom: 1px dashed var(--line);
}

.site-footer__contact-list li:last-child { border-bottom: 0; }

.site-footer__meta {
  flex: 0 0 auto;
  width: 3.2em;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--neon);
}

.site-footer__value {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--ink);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-block: 20px 28px;
}

.site-footer__copyright {
  font-size: 0.8125rem;
  color: var(--muted);
}

.site-footer__copyright [data-year] {
  font-family: var(--font-data);
  color: var(--neon);
}

.site-footer__slogan {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.site-footer__slogan::before {
  content: "◢";
  margin-right: 8px;
  color: var(--neon);
}

@media (max-width: 900px) {
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
  .site-footer__cell--brand { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
  .site-footer__grid { grid-template-columns: 1fr; }
  .site-footer__cell--brand { grid-column: auto; }
  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
}

/* ---------- 滚动渐入 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s cubic-bezier(0.4, 0, 0.2, 1), transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

.js [data-reveal][data-reveal-delay="1"] { transition-delay: 0.1s; }
.js [data-reveal][data-reveal-delay="2"] { transition-delay: 0.2s; }
.js [data-reveal][data-reveal-delay="3"] { transition-delay: 0.3s; }

/* ---------- 焦点可见 ---------- */
:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
  border-radius: 2px;
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .scroll-progress__bar { transition: none; }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}