/* =========================================================
   亚博AG体育内容站 — 共享外壳样式 /assets/site.css
   01 重置  02 变量  03 基础排版  04 工具与组件
   05 头部  06 页脚  07 响应式  08 动效降级
   ========================================================= */

/* ================= 01 重置 ================= */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

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

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

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

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

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

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

table { border-collapse: collapse; width: 100%; }

hr { border: 0; }

:where(section, article, div, h2, h3)[id] { scroll-margin-top: 104px; }

/* ================= 02 变量 ================= */
:root {
  /* 色彩 */
  --yb-bg: #0B0E12;
  --yb-bg-2: #161B22;
  --yb-bg-3: #1E2530;
  --yb-red: #E2231A;
  --yb-red-deep: #8C1410;
  --yb-cyan: #24E0C8;
  --yb-gold: #F5C542;
  --yb-ink: #E8EDF2;
  --yb-muted: #8A94A6;
  --yb-green: #35D07F;
  --yb-paper: #F4F1EA;

  --yb-line: rgba(138, 148, 166, 0.22);
  --yb-line-cyan: rgba(36, 224, 200, 0.38);
  --yb-line-red: rgba(226, 35, 26, 0.42);

  /* 尺度 */
  --yb-shell: 1320px;
  --yb-header-h: 84px;
  --yb-header-h-compact: 68px;
  --yb-r-sm: 4px;
  --yb-r-md: 9px;
  --yb-r-lg: 16px;

  /* 字体 */
  --yb-font-display: "Impact", "Haettenschweiler", "Arial Narrow Bold", "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --yb-font-body: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --yb-font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --yb-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ================= 03 基础排版 ================= */
body {
  min-height: 100vh;
  font-family: var(--yb-font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--yb-ink);
  background:
    radial-gradient(960px 520px at 84% -8%, rgba(226, 35, 26, 0.14), transparent 62%),
    radial-gradient(760px 520px at 2% 6%, rgba(36, 224, 200, 0.075), transparent 60%),
    radial-gradient(1000px 700px at 50% 100%, rgba(140, 20, 16, 0.16), transparent 68%),
    var(--yb-bg);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--yb-font-display);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: 0.005em;
  text-wrap: balance;
}

h1 { font-size: clamp(34px, 6.2vw, 68px); }
h2 { font-size: clamp(26px, 4vw, 42px); }
h3 { font-size: clamp(20px, 2.6vw, 28px); }

strong { font-weight: 800; }

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--yb-cyan);
  outline-offset: 3px;
  border-radius: 3px;
}

::selection {
  background: var(--yb-red);
  color: #fff;
}

/* ================= 04 工具与组件 ================= */

/* --- 容器与章节节奏 --- */
.yb-shell {
  width: min(100% - 2.5rem, var(--yb-shell));
  margin-inline: auto;
}

.yb-section { padding-block: clamp(2.5rem, 6vw, 5rem); }
.yb-section--tight { padding-block: clamp(1.6rem, 3.6vw, 2.75rem); }

.yb-hero {
  padding-top: calc(var(--yb-header-h) + clamp(1.75rem, 5vw, 4.25rem));
  padding-bottom: clamp(1.5rem, 4vw, 3rem);
}

/* --- 标签与细线 --- */
.yb-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yb-cyan);
}

.yb-label::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--yb-cyan);
  opacity: 0.8;
}

.yb-rule {
  height: 1px;
  width: 100%;
  background: linear-gradient(90deg, var(--yb-cyan), rgba(36, 224, 200, 0));
  transform-origin: 0 50%;
}

.yb-tag {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  font-family: var(--yb-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #1A1D22;
  background: var(--yb-paper);
  border-radius: 2px;
  box-shadow: 2px 2px 0 var(--yb-red-deep);
  transform: rotate(-1.5deg);
}

.yb-tag--red {
  background: var(--yb-red);
  color: #fff;
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.55);
}

.yb-tag--gold {
  background: var(--yb-gold);
  color: #241C00;
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.55);
}

/* --- 按钮 --- */
.yb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border: 1px solid transparent;
  border-radius: var(--yb-r-sm);
  white-space: nowrap;
  transition:
    transform 0.28s var(--yb-ease),
    background-color 0.25s ease,
    border-color 0.25s ease,
    color 0.25s ease,
    box-shadow 0.28s ease;
}

.yb-btn--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--yb-red), var(--yb-red-deep));
  box-shadow: 0 8px 22px rgba(226, 35, 26, 0.3);
}

.yb-btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(226, 35, 26, 0.42);
}

.yb-btn--ghost {
  color: var(--yb-ink);
  background: rgba(22, 27, 34, 0.66);
  border-color: var(--yb-line);
}

.yb-btn--ghost:hover {
  color: var(--yb-cyan);
  border-color: var(--yb-line-cyan);
  transform: translateY(-2px);
}

.yb-btn--cyan {
  color: #06201C;
  background: var(--yb-cyan);
}

.yb-btn--cyan:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(36, 224, 200, 0.3);
}

.yb-btn--sm {
  padding: 0.42rem 0.8rem;
  font-size: 0.8rem;
}

/* --- 面包屑 --- */
.yb-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--yb-font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--yb-muted);
}

.yb-crumbs li::after {
  content: "/";
  margin-left: 0.45rem;
  color: rgba(138, 148, 166, 0.5);
}

.yb-crumbs li:last-child::after { display: none; }

.yb-crumbs a { color: var(--yb-muted); transition: color 0.2s ease; }
.yb-crumbs a:hover { color: var(--yb-cyan); }
.yb-crumbs [aria-current="page"] { color: var(--yb-ink); }

/* --- 网格 --- */
.yb-grid {
  display: grid;
  gap: clamp(1rem, 2.2vw, 1.75rem);
}

.yb-grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.yb-grid--3 { grid-template-columns: repeat(auto-fit, minmax(238px, 1fr)); }
.yb-grid--4 { grid-template-columns: repeat(auto-fit, minmax(196px, 1fr)); }
.yb-grid--wide { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

/* --- 正文 --- */
.yb-prose {
  max-width: 44rem;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(232, 237, 242, 0.86);
}

.yb-prose > * + * { margin-top: 1.05em; }
.yb-prose p { max-width: 40ch; }
.yb-prose h2,
.yb-prose h3 { color: var(--yb-ink); margin-top: 1.6em; }
.yb-prose strong { color: var(--yb-ink); }
.yb-prose a { color: var(--yb-cyan); border-bottom: 1px solid var(--yb-line-cyan); }
.yb-prose ul { display: grid; gap: 0.5rem; padding-left: 1.1rem; }
.yb-prose li { position: relative; }
.yb-prose li::before {
  content: "";
  position: absolute;
  left: -1.1rem;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--yb-red);
}

/* --- 纸张叠层卡片 --- */
.yb-card {
  position: relative;
  padding: clamp(1.15rem, 2.4vw, 1.6rem);
  background: linear-gradient(180deg, var(--yb-bg-2), #12171E);
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-r-md);
  transition:
    transform 0.3s var(--yb-ease),
    box-shadow 0.3s ease,
    border-color 0.3s ease;
}

.yb-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(140, 20, 16, 0.62);
  border-radius: inherit;
  transform: translate(5px, 5px);
  pointer-events: none;
  transition: transform 0.3s var(--yb-ease);
}

.yb-card:hover {
  transform: translateY(-4px);
  border-color: var(--yb-line-cyan);
  box-shadow: 0 20px 44px rgba(140, 20, 16, 0.32);
}

.yb-card:hover::before { transform: translate(8px, 8px); }

.yb-card__kicker {
  display: block;
  margin-bottom: 0.75rem;
  font-family: var(--yb-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--yb-muted);
}

.yb-card__title {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--yb-ink);
}

/* --- 比分牌数字 --- */
.yb-stat {
  position: relative;
  padding-top: 1.5rem;
}

.yb-stat__value {
  display: block;
  font-family: var(--yb-font-mono);
  font-size: clamp(3rem, 7vw, 4.5rem);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--yb-gold);
  font-variant-numeric: tabular-nums;
}

.yb-stat__value--cyan { color: var(--yb-cyan); }
.yb-stat__value--red { color: var(--yb-red); }

.yb-stat__label {
  display: block;
  margin-top: 0.65rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--yb-muted);
}

/* --- 响应式图片容器 --- */
.yb-figure {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-r-md);
  background:
    linear-gradient(135deg, rgba(226, 35, 26, 0.18), rgba(36, 224, 200, 0.1)),
    repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.04) 0 2px, transparent 2px 9px),
    var(--yb-bg-2);
}

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

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

.yb-figure__tag {
  position: absolute;
  left: 0.9rem;
  bottom: 0.9rem;
  z-index: 2;
  padding: 0.2rem 0.55rem;
  font-family: var(--yb-font-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #1A1D22;
  background: var(--yb-paper);
  border-radius: 2px;
  box-shadow: 2px 2px 0 var(--yb-red-deep);
}

/* --- 更新日志式时间轴 --- */
.yb-timeline {
  position: relative;
  display: grid;
  gap: 1.5rem;
  padding-left: 1.6rem;
}

.yb-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 1px;
  background: linear-gradient(180deg, var(--yb-cyan), rgba(36, 224, 200, 0));
}

.yb-timeline__item { position: relative; }

.yb-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: 0.6rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--yb-bg);
  border: 2px solid var(--yb-cyan);
  box-shadow: 0 0 0 4px rgba(36, 224, 200, 0.12);
}

/* --- 返回顶部 --- */
.yb-backtop {
  position: fixed;
  right: 1.1rem;
  bottom: 1.1rem;
  z-index: 70;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--yb-cyan);
  background: rgba(22, 27, 34, 0.94);
  border: 1px solid var(--yb-line-cyan);
  border-radius: 50%;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s var(--yb-ease), background-color 0.25s ease;
}

.yb-backtop[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.yb-backtop:hover {
  background: var(--yb-red);
  color: #fff;
  border-color: var(--yb-red);
}

/* --- 渐显 --- */
html[data-reveal-ready="true"] [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.55s ease, transform 0.55s var(--yb-ease);
}

html[data-reveal-ready="true"] [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* --- 章节目录跟随态 --- */
[data-toc-link] { transition: color 0.25s ease, border-color 0.25s ease; }
[data-toc-link][data-active="true"] { color: var(--yb-ink); }

/* ================= 05 头部 ================= */
.yb-header {
  position: sticky;
  top: 0;
  z-index: 90;
  margin-bottom: calc(-1 * var(--yb-header-h));
  color: var(--yb-ink);
  background: linear-gradient(180deg, rgba(11, 14, 18, 0.94) 0%, rgba(11, 14, 18, 0.5) 58%, rgba(11, 14, 18, 0) 100%);
  border-bottom: 1px solid transparent;
  transition: background-color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.yb-header[data-stuck="true"] {
  background: rgba(11, 14, 18, 0.97);
  border-bottom-color: var(--yb-line);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.5);
}

.yb-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(0.5rem, 1.6vw, 1.75rem);
  width: min(100% - 2.5rem, var(--yb-shell));
  min-height: var(--yb-header-h);
  margin-inline: auto;
  transition: min-height 0.35s var(--yb-ease);
}

.yb-header[data-stuck="true"] .yb-header__inner {
  min-height: var(--yb-header-h-compact);
}

/* --- 品牌 --- */
.yb-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
}

.yb-brand__badge {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  font-family: var(--yb-font-display);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #fff;
  background: linear-gradient(145deg, var(--yb-red), var(--yb-red-deep));
  border-radius: 6px;
  box-shadow: 0 8px 20px rgba(226, 35, 26, 0.35), inset 0 -2px 0 rgba(0, 0, 0, 0.28);
}

.yb-brand__meta {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.yb-brand__name {
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--yb-ink);
}

.yb-brand__tag {
  font-family: var(--yb-font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--yb-muted);
}

/* --- 导航 --- */
.yb-nav { display: block; }

.yb-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.1rem, 0.9vw, 0.7rem);
}

.yb-nav__item { flex: 0 0 auto; }

.yb-nav__link {
  position: relative;
  display: inline-block;
  padding: 0.55rem 0.7rem;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(232, 237, 242, 0.76);
  border-radius: var(--yb-r-sm);
  transition: color 0.22s ease, background-color 0.22s ease;
}

.yb-nav__link::after {
  content: "";
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.26rem;
  height: 2px;
  background: var(--yb-red);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.32s var(--yb-ease), background-color 0.22s ease;
}

.yb-nav__link:hover,
.yb-nav__link:focus-visible { color: #fff; }
.yb-nav__link:hover::after { transform: scaleX(1); }

.yb-nav__link[aria-current="page"] { color: #fff; }
.yb-nav__link[aria-current="page"]::after {
  background: var(--yb-cyan);
  transform: scaleX(1);
}

.yb-nav__focus { display: none; }

.yb-nav__focus-label {
  font-family: var(--yb-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--yb-gold);
}

.yb-nav__focus-note {
  font-size: 0.82rem;
  color: var(--yb-muted);
}

/* --- 右侧工具区 --- */
.yb-header__tools {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
}

.yb-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  padding: 0.38rem 0.72rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: rgba(232, 237, 242, 0.8);
  background: rgba(22, 27, 34, 0.5);
  border: 1px solid var(--yb-line);
  border-radius: 999px;
  white-space: nowrap;
  transition: color 0.24s ease, border-color 0.24s ease, background-color 0.24s ease;
}

.yb-chip:hover {
  color: #fff;
  background: rgba(36, 224, 200, 0.1);
  border-color: var(--yb-line-cyan);
}

.yb-chip__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--yb-green);
  box-shadow: 0 0 0 3px rgba(53, 208, 127, 0.18);
}

/* --- 汉堡按钮 --- */
.yb-burger {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.7rem;
  color: var(--yb-ink);
  border: 1px solid var(--yb-line);
  border-radius: 6px;
  transition: border-color 0.24s ease, color 0.24s ease;
}

.yb-burger:hover { border-color: var(--yb-line-cyan); color: var(--yb-cyan); }

.yb-burger__box {
  position: relative;
  display: block;
  width: 20px;
  height: 14px;
}

.yb-burger__box span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.3s var(--yb-ease), opacity 0.2s ease;
}

.yb-burger__box span:nth-child(1) { top: 0; }
.yb-burger__box span:nth-child(2) { top: 6px; }
.yb-burger__box span:nth-child(3) { top: 12px; }

.yb-burger[aria-expanded="true"] .yb-burger__box span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.yb-burger[aria-expanded="true"] .yb-burger__box span:nth-child(2) { opacity: 0; }

.yb-burger[aria-expanded="true"] .yb-burger__box span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.yb-burger__text {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

/* --- 滚动进度 --- */
.yb-header__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--yb-red), var(--yb-gold) 55%, var(--yb-cyan));
  transform: scaleX(0);
  transform-origin: 0 50%;
  opacity: 0.95;
}

/* --- 跳转链接 --- */
.yb-skip-link {
  position: absolute;
  top: 0.4rem;
  left: 50%;
  z-index: 120;
  padding: 0.55rem 1rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #06201C;
  background: var(--yb-cyan);
  border-radius: 4px;
  transform: translate(-50%, -160%);
  transition: transform 0.24s var(--yb-ease);
}

.yb-skip-link:focus {
  transform: translate(-50%, 0);
}

/* ================= 06 页脚 ================= */
.yb-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  color: var(--yb-ink);
  background:
    radial-gradient(1100px 420px at 12% 0%, rgba(226, 35, 26, 0.18), transparent 65%),
    radial-gradient(760px 320px at 92% 10%, rgba(36, 224, 200, 0.08), transparent 62%),
    linear-gradient(180deg, #10151C 0%, #0B0E12 62%);
  border-top: 1px solid var(--yb-line);
}

.yb-footer__inner {
  width: min(100% - 2.5rem, var(--yb-shell));
  margin-inline: auto;
  padding: clamp(2.5rem, 5vw, 4rem) 0 2rem;
}

.yb-footer__grid {
  display: grid;
  grid-template-columns: minmax(250px, 1.7fr) repeat(3, minmax(130px, 1fr));
  gap: clamp(1.5rem, 3vw, 3rem);
  padding-bottom: clamp(1.75rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--yb-line);
}

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

.yb-footer__desc {
  max-width: 34ch;
  margin-top: 1rem;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--yb-muted);
}

.yb-footer__pulse {
  display: grid;
  gap: 0.5rem;
  margin-top: 1.25rem;
  font-size: 0.82rem;
  color: rgba(232, 237, 242, 0.74);
}

.yb-footer__pulse li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.yb-dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--yb-muted);
}

.yb-dot--live {
  background: var(--yb-green);
  box-shadow: 0 0 0 4px rgba(53, 208, 127, 0.16);
  animation: yb-pulse 2.4s ease-in-out infinite;
}

@keyframes yb-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(53, 208, 127, 0.16); }
  50% { box-shadow: 0 0 0 7px rgba(53, 208, 127, 0.05); }
}

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

.yb-footer__title {
  position: relative;
  padding-bottom: 0.65rem;
  margin-bottom: 0.95rem;
  font-family: var(--yb-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yb-paper);
  border-bottom: 1px solid var(--yb-line);
}

.yb-footer__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 34px;
  height: 1px;
  background: var(--yb-red);
}

.yb-footer__links {
  display: grid;
  gap: 0.55rem;
}

.yb-footer__links a {
  display: inline-block;
  font-size: 0.92rem;
  color: var(--yb-muted);
  transition: color 0.22s ease, transform 0.22s var(--yb-ease);
}

.yb-footer__links a:hover {
  color: var(--yb-cyan);
  transform: translateX(4px);
}

.yb-footer__service {
  display: grid;
  gap: 0.5rem;
  padding: clamp(1.25rem, 2.5vw, 1.75rem) 0;
  border-bottom: 1px solid var(--yb-line);
  font-size: 0.9rem;
  color: rgba(232, 237, 242, 0.78);
}

.yb-footer__serviceline { max-width: 78ch; }
.yb-footer__address { color: var(--yb-muted); }

.yb-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.5rem;
  padding-top: 1.5rem;
  font-family: var(--yb-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--yb-muted);
}

.yb-footer__legal a {
  color: var(--yb-muted);
  border-bottom: 1px solid transparent;
  transition: color 0.22s ease, border-color 0.22s ease;
}

.yb-footer__legal a:hover {
  color: var(--yb-ink);
  border-bottom-color: var(--yb-red);
}

/* ================= 07 响应式 ================= */
@media (max-width: 1180px) {
  .yb-chip { display: none; }
}

@media (max-width: 980px) {
  :root { --yb-header-h: 72px; --yb-header-h-compact: 62px; }

  .yb-brand__tag { display: none; }

  .yb-burger { display: inline-flex; }

  .yb-header__cta { display: none; }

  .yb-nav {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 96;
    display: block;
    width: min(86vw, 360px);
    height: 100vh;
    height: 100dvh;
    padding: calc(var(--yb-header-h) + 1.25rem) 1.25rem 2.5rem;
    overflow-y: auto;
    background: linear-gradient(180deg, #151B23 0%, #0B0E12 100%);
    border-left: 1px solid var(--yb-line);
    box-shadow: -24px 0 60px rgba(0, 0, 0, 0.62);
    transform: translateX(103%);
    transition: transform 0.42s var(--yb-ease);
  }

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

  .yb-nav__focus {
    display: grid;
    gap: 0.3rem;
    margin-bottom: 1.4rem;
    padding: 0.85rem 1rem;
    background: rgba(22, 27, 34, 0.92);
    border: 1px solid var(--yb-line-cyan);
    border-left: 3px solid var(--yb-cyan);
    border-radius: var(--yb-r-md);
  }

  .yb-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.1rem;
  }

  .yb-nav__link {
    display: block;
    padding: 0.85rem 0.6rem;
    font-size: 1.04rem;
    border-bottom: 1px solid var(--yb-line);
    border-radius: 0;
  }

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

  .yb-nav__link[aria-current="page"] {
    background: linear-gradient(90deg, rgba(226, 35, 26, 0.24), transparent 78%);
    box-shadow: inset 3px 0 0 var(--yb-red);
    padding-left: 0.95rem;
  }

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

  .yb-footer__intro { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .yb-shell,
  .yb-header__inner,
  .yb-footer__inner { width: min(100% - 1.75rem, var(--yb-shell)); }

  .yb-brand__badge { width: 38px; height: 38px; font-size: 1.1rem; }
  .yb-brand__name { font-size: 0.96rem; }

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

  .yb-stat__value { font-size: clamp(2.6rem, 13vw, 3.4rem); }

  .yb-backtop { right: 0.8rem; bottom: 0.8rem; }
}

/* ================= 08 动效降级 ================= */
@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;
  }

  html[data-reveal-ready="true"] [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .yb-header__progress { transition: none; }
}