/* ============================================================
   易倍体育入口 · 共享样式表 /assets/site.css
   设计系统：赛事数据控制台长卷
   ============================================================ */

/* ---------- 1. 令牌 ---------- */
:root {
  --yb-deep: #0A1B3D;
  --yb-deep-2: #071229;
  --yb-indigo: #241A5E;
  --yb-teal: #0C4A48;
  --yb-wine: #6B1230;
  --yb-orange: #FF6A1A;
  --yb-orange-deep: #B8430A;
  --yb-orange-2: #FF4D2E;
  --yb-amber: #FF9A3C;
  --yb-lime: #B8FF45;
  --yb-amber-tag: #FFC24B;
  --yb-silver: #C6D2E3;
  --yb-paper: #F2F5FA;
  --yb-ink: #0A0C12;

  --yb-line: rgba(198, 210, 227, 0.22);
  --yb-line-strong: rgba(198, 210, 227, 0.44);
  --yb-grad: linear-gradient(100deg, #FF4D2E 0%, #FF9A3C 100%);

  --yb-container: 1360px;
  --yb-gutter: 24px;
  --yb-prose: 720px;
  --yb-radius: 2px;

  --yb-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --yb-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

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

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

body {
  margin: 0;
  background: var(--yb-deep);
  color: var(--yb-paper);
  font-family: var(--yb-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img, svg, video { max-width: 100%; display: block; }
button { font: inherit; color: inherit; }
[id] { scroll-margin-top: 120px; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--yb-sans);
  font-weight: 900;
  letter-spacing: -0.02em;
}

p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px; padding-left: 22px; }

a { color: var(--yb-orange); }

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

/* ---------- 3. 通用工具类 ---------- */
.yb-container {
  width: 100%;
  max-width: var(--yb-container);
  margin: 0 auto;
  padding-left: var(--yb-gutter);
  padding-right: var(--yb-gutter);
}

.yb-display {
  font-size: clamp(40px, 6.2vw, 96px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0;
}

.yb-h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0;
}

.yb-overline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--yb-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.16em;
  line-height: 1;
  color: var(--yb-orange);
  text-transform: uppercase;
}

.yb-mono { font-family: var(--yb-mono); letter-spacing: 0.08em; }
.yb-num { font-variant-numeric: tabular-nums; }

.yb-section { padding: 64px 0; }
.yb-section--tight { padding: 40px 0; }

/* ---------- 4. 页头 ---------- */
.yb-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--yb-deep-2);
  border-bottom: 1px solid var(--yb-line);
}

.yb-skip {
  position: absolute;
  left: 12px;
  top: -72px;
  z-index: 140;
  padding: 10px 16px;
  background: var(--yb-lime);
  color: var(--yb-ink);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  border-radius: var(--yb-radius);
  transition: top 0.15s ease;
}
.yb-skip:focus { top: 12px; }

.yb-topbar {
  background: linear-gradient(90deg, rgba(36, 26, 94, 0.92) 0%, rgba(10, 27, 61, 0.94) 46%, rgba(12, 74, 72, 0.88) 100%);
  border-bottom: 1px solid var(--yb-line);
}

.yb-topbar__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 58px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.yb-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: inherit;
  text-decoration: none;
}

.yb-brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--yb-grad);
  color: var(--yb-ink);
  font-family: var(--yb-sans);
  font-size: 18px;
  font-weight: 900;
  line-height: 1;
  border-radius: var(--yb-radius);
}

.yb-brand__text { display: flex; flex-direction: column; gap: 3px; }

.yb-brand__line {
  font-size: 16px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--yb-paper);
}

.yb-brand__tagline {
  font-family: var(--yb-mono);
  font-size: 12px;
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: 0.06em;
  color: var(--yb-silver);
}

.yb-status {
  display: flex;
  align-items: center;
  gap: 9px;
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  padding: 7px 12px;
  border: 1px solid var(--yb-line-strong);
  background: rgba(12, 74, 72, 0.42);
  border-radius: var(--yb-radius);
  font-family: var(--yb-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--yb-lime);
}

.yb-status__dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  background: var(--yb-lime);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(184, 255, 69, 0.6);
  animation: yb-pulse 2s ease-out infinite;
}

.yb-status__text {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

@keyframes yb-pulse {
  0% { box-shadow: 0 0 0 0 rgba(184, 255, 69, 0.55); }
  70% { box-shadow: 0 0 0 9px rgba(184, 255, 69, 0); }
  100% { box-shadow: 0 0 0 0 rgba(184, 255, 69, 0); }
}

.yb-utility {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
  flex: 0 0 auto;
}

.yb-utility__link {
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  font-family: var(--yb-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--yb-silver);
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.yb-utility__link:hover { color: var(--yb-paper); border-bottom-color: var(--yb-orange); }

.yb-navbar { background: var(--yb-deep); }

.yb-navbar__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 64px;
  padding-top: 6px;
  padding-bottom: 6px;
}

.yb-nav { flex: 1 1 auto; min-width: 0; }

.yb-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.yb-nav__item { margin: 0; }

.yb-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  border-bottom: 2px solid transparent;
  border-left: 2px solid transparent;
  border-radius: var(--yb-radius);
  color: var(--yb-silver);
  text-decoration: none;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.yb-nav__link:hover { color: var(--yb-paper); background: rgba(198, 210, 227, 0.08); }

.yb-nav__link[aria-current="page"] {
  color: var(--yb-ink);
  background: var(--yb-lime);
  border-bottom-color: var(--yb-orange);
}

.yb-nav__index {
  font-family: var(--yb-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--yb-orange);
}
.yb-nav__link[aria-current="page"] .yb-nav__index { color: var(--yb-ink); }

.yb-nav__label {
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
}

.yb-nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.yb-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 13px;
  background: transparent;
  border: 1px solid var(--yb-line-strong);
  border-radius: var(--yb-radius);
  color: var(--yb-paper);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
}
.yb-nav-toggle:hover { border-color: var(--yb-lime); color: var(--yb-lime); }

.yb-nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--yb-lime);
  transition: background 0.15s ease;
}
.yb-nav-toggle__bars::before,
.yb-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--yb-lime);
  transition: transform 0.15s ease;
}
.yb-nav-toggle__bars::before { top: -6px; }
.yb-nav-toggle__bars::after { top: 6px; }

.yb-header[data-open] .yb-nav-toggle__bars { background: transparent; }
.yb-header[data-open] .yb-nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.yb-header[data-open] .yb-nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

.yb-nav-toggle__label { font-size: 14px; letter-spacing: 0.04em; }

.yb-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(198, 210, 227, 0.12);
  pointer-events: none;
}

.yb-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--yb-grad);
}

/* ---------- 5. 按钮 ---------- */
.yb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: var(--yb-radius);
  font-family: var(--yb-sans);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.yb-btn--primary { background: var(--yb-grad); color: var(--yb-ink); }
.yb-btn--primary:hover { transform: translateY(-1px); }

.yb-btn--ghost {
  background: transparent;
  border-color: var(--yb-line-strong);
  color: var(--yb-paper);
}
.yb-btn--ghost:hover { border-color: var(--yb-lime); color: var(--yb-lime); }

.yb-btn--lime { background: var(--yb-lime); color: var(--yb-ink); }
.yb-btn--lime:hover { transform: translateY(-1px); }

.yb-btn--quiet {
  padding: 8px 10px;
  background: transparent;
  color: var(--yb-silver);
  font-weight: 500;
}
.yb-btn--quiet:hover { color: var(--yb-lime); }

/* ---------- 6. 页脚 ---------- */
.yb-footer {
  background: var(--yb-deep-2);
  border-top: 1px solid var(--yb-line-strong);
  color: var(--yb-silver);
}

.yb-footer__grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1fr;
  gap: 32px;
  padding: 56px 0 40px;
}

.yb-footer__brand { min-width: 0; }

.yb-footer__title {
  margin: 0 0 12px;
  font-size: 22px;
  font-weight: 900;
  line-height: 1.2;
  color: var(--yb-paper);
}

.yb-footer__line {
  max-width: 34ch;
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--yb-silver);
}

.yb-footer__mono {
  margin: 18px 0 0;
  font-family: var(--yb-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--yb-orange);
}

.yb-footer__col { min-width: 0; }

.yb-footer__coltitle {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--yb-line);
  font-family: var(--yb-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--yb-silver);
}

.yb-footer__links {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.yb-footer__link {
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  font-size: 15px;
  color: var(--yb-paper);
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.yb-footer__link:hover { color: var(--yb-lime); border-bottom-color: var(--yb-lime); }

.yb-footer__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 28px;
  margin: 0;
  padding: 20px 0;
  border-top: 1px solid var(--yb-line);
  border-bottom: 1px solid var(--yb-line);
}

.yb-contact-item {
  font-family: var(--yb-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--yb-silver);
}

.yb-contact-item--key { color: var(--yb-lime); }

.yb-footer__legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 28px;
  padding: 20px 0 36px;
}

.yb-footer__legal-line {
  margin: 0;
  font-family: var(--yb-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--yb-silver);
}

/* ---------- 7. 面包屑 ---------- */
.yb-crumbs { padding: 24px 0 0; }

.yb-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--yb-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.5;
  color: var(--yb-silver);
}

.yb-crumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.yb-crumbs__item::after { content: "/"; color: var(--yb-orange); }
.yb-crumbs__item:last-child::after { content: ""; }

.yb-crumbs__link { color: var(--yb-silver); text-decoration: none; }
.yb-crumbs__link:hover { color: var(--yb-lime); }
.yb-crumbs__current { color: var(--yb-paper); }

/* ---------- 8. 正文区 ---------- */
.yb-prose {
  max-width: var(--yb-prose);
  font-size: 17px;
  line-height: 1.75;
}

.yb-prose h2 {
  margin: 40px 0 12px;
  font-size: 28px;
  font-weight: 900;
  line-height: 1.3;
}
.yb-prose h3 {
  margin: 28px 0 10px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.yb-prose p { margin: 0 0 16px; }
.yb-prose ul, .yb-prose ol { margin: 0 0 16px; padding-left: 22px; }
.yb-prose li { margin: 6px 0; }
.yb-prose a { color: var(--yb-orange); text-decoration: underline; text-underline-offset: 3px; }
.yb-prose strong { color: var(--yb-lime); font-weight: 700; }

.yb-band--paper .yb-prose a { color: var(--yb-orange-deep); }
.yb-band--paper .yb-prose strong { color: var(--yb-teal); }

/* ---------- 9. 栅格与色带 ---------- */
.yb-grid { display: grid; gap: 24px; }
.yb-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.yb-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.yb-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.yb-band {
  padding: 56px 0;
  border-top: 1px solid var(--yb-line);
  border-bottom: 1px solid var(--yb-line);
}
.yb-band--indigo { background: var(--yb-indigo); }
.yb-band--teal { background: var(--yb-teal); }
.yb-band--wine { background: var(--yb-wine); }
.yb-band--paper { background: var(--yb-paper); color: var(--yb-ink); }
.yb-band--paper .yb-overline { color: var(--yb-orange-deep); }

/* ---------- 10. 卡片 / 徽章 / 数字 ---------- */
.yb-card {
  padding: 22px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--yb-line);
  border-left: 2px solid var(--yb-orange);
  border-radius: var(--yb-radius);
}
.yb-card--lime { border-left-color: var(--yb-lime); }
.yb-card--flat { background: transparent; }

.yb-card__title {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--yb-paper);
}

.yb-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--yb-silver);
}

.yb-band--paper .yb-card { background: #FFFFFF; border-color: #D7DFEC; }
.yb-band--paper .yb-card__title { color: var(--yb-ink); }
.yb-band--paper .yb-card__text { color: #3A4256; }

.yb-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--yb-line-strong);
  border-radius: var(--yb-radius);
  font-family: var(--yb-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--yb-silver);
  background: transparent;
}
.yb-badge--lime { background: var(--yb-lime); border-color: var(--yb-lime); color: var(--yb-ink); }
.yb-badge--amber { background: var(--yb-amber-tag); border-color: var(--yb-amber-tag); color: var(--yb-ink); }
.yb-badge--orange { background: var(--yb-orange); border-color: var(--yb-orange); color: var(--yb-ink); }

.yb-stat {
  padding-top: 14px;
  border-top: 1px solid var(--yb-line-strong);
}

.yb-stat__num {
  display: block;
  font-family: var(--yb-sans);
  font-size: clamp(40px, 5vw, 64px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--yb-lime);
}

.yb-stat__label {
  display: block;
  margin-top: 8px;
  font-family: var(--yb-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.5;
  color: var(--yb-silver);
}

.yb-band--paper .yb-stat { border-top-color: #C3CCDD; }
.yb-band--paper .yb-stat__num { color: var(--yb-teal); }
.yb-band--paper .yb-stat__label { color: #4A5568; }

/* ---------- 11. 图片容器基类 ---------- */
.yb-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-radius);
  background: linear-gradient(135deg, rgba(36, 26, 94, 0.9), rgba(10, 27, 61, 0.9));
}
.yb-media > img { width: 100%; height: 100%; object-fit: cover; }
.yb-media--16x9 { aspect-ratio: 16 / 9; }
.yb-media--4x3 { aspect-ratio: 4 / 3; }
.yb-media--1x1 { aspect-ratio: 1 / 1; }
.yb-media--3x4 { aspect-ratio: 3 / 4; }
.yb-media--wide { aspect-ratio: 21 / 9; }
.yb-media--blur::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(255, 77, 46, 0.38) 0%, rgba(255, 154, 60, 0.1) 45%, rgba(10, 27, 61, 0) 70%);
  pointer-events: none;
}

/* ---------- 12. 标签页 ---------- */
.yb-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--yb-line-strong);
}

.yb-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--yb-silver);
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.yb-tab:hover { color: var(--yb-paper); background: rgba(198, 210, 227, 0.08); }
.yb-tab[aria-selected="true"] {
  background: var(--yb-orange);
  border-bottom-color: var(--yb-lime);
  color: var(--yb-ink);
}

.yb-tab__index {
  font-family: var(--yb-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.yb-tabpanel { padding: 22px 0 0; }
.yb-tabpanel[hidden] { display: none; }

@keyframes yb-fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}
.yb-tabpanel:not([hidden]) { animation: yb-fade 0.15s ease both; }

/* ---------- 13. 显现与返回顶部 ---------- */
:root.yb-js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
:root.yb-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

.yb-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 15px;
  background: var(--yb-lime);
  border: 0;
  border-radius: var(--yb-radius);
  color: var(--yb-ink);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}
.yb-top.is-visible { opacity: 1; visibility: visible; transform: none; }

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1180px) {
  .yb-brand__tagline { display: none; }
  .yb-status__text { white-space: normal; }
}

@media (max-width: 1000px) {
  .yb-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; padding: 44px 0 32px; }
  .yb-grid--3, .yb-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .yb-topbar__inner { flex-wrap: wrap; gap: 12px 16px; }
  .yb-utility { margin-left: 0; }
  .yb-status { order: 3; flex: 1 1 100%; }

  .yb-navbar__inner { flex-wrap: wrap; gap: 0; }
  .yb-nav-toggle { display: inline-flex; order: 1; }
  .yb-nav {
    display: none;
    order: 3;
    flex: 1 1 100%;
    margin-top: 10px;
    padding-top: 6px;
    border-top: 1px solid var(--yb-line);
  }
  .yb-header[data-open] .yb-nav { display: block; }
  .yb-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .yb-nav__link {
    justify-content: space-between;
    padding: 13px 4px;
    border-bottom: 1px solid var(--yb-line);
    border-left: 2px solid transparent;
    border-radius: 0;
  }
  .yb-nav__link[aria-current="page"] {
    background: rgba(184, 255, 69, 0.14);
    border-left-color: var(--yb-lime);
    border-bottom-color: var(--yb-line);
    color: var(--yb-lime);
  }
  .yb-nav__link[aria-current="page"] .yb-nav__index { color: var(--yb-lime); }

  .yb-nav-actions { display: none; }
  .yb-header[data-open] .yb-nav-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    order: 4;
    flex: 1 1 100%;
    padding: 14px 0 4px;
  }
  .yb-nav-actions .yb-btn { flex: 1 1 auto; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .yb-container { padding-left: 18px; padding-right: 18px; }
  .yb-section { padding: 44px 0; }
  .yb-band { padding: 40px 0; }
  .yb-grid--2, .yb-grid--3, .yb-grid--4 { grid-template-columns: 1fr; }
  .yb-footer__grid { grid-template-columns: 1fr; gap: 26px; }
  .yb-footer__contact { flex-direction: column; align-items: flex-start; gap: 8px; }
  .yb-footer__legal { flex-direction: column; }
  .yb-brand__line { font-size: 15px; }
  .yb-top { right: 14px; bottom: 16px; }
}

/* ---------- 15. 无动画偏好 ---------- */
@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;
  }
  :root.yb-js [data-reveal] { opacity: 1; transform: none; }
  .yb-status__dot { animation: none; }
}