/* ============================================================
   欧宝赛事 · 共享样式 /assets/site.css
   深底数据仪表盘：极细边框、斜切色块、等宽数字、克制动效
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd,
section, article, aside, nav, header, footer { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid #FFC61A; outline-offset: 3px; border-radius: 2px; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0A0D10;
  --carbon: #141A20;
  --rule: #2A3540;
  --navy: #16222E;
  --yellow: #FFC61A;
  --gold: #FFE07A;
  --green: #35E08A;
  --signal: #FF5B45;
  --mist: #E9EEF3;
  --white: #FFFFFF;
  --text-dim: #93A2AE;
  --text-mid: #AEBBC6;

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

  --fs-display: clamp(40px, 6.4vw, 84px);
  --fs-h1: clamp(30px, 4.6vw, 56px);
  --fs-h2: clamp(24px, 3.2vw, 36px);
  --fs-h3: clamp(19px, 2.1vw, 28px);
  --fs-h4: 22px;
  --fs-body: 17px;
  --fs-sm: 14px;
  --fs-xs: 12px;

  --maxw: 1280px;
  --pad: 32px;
  --radius: 4px;
  --t-fast: 120ms ease-out;
  --t-line: 180ms ease-out;
  --t-fold: 220ms ease-in-out;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(42, 53, 64, .22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 53, 64, .22) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: -1px -1px;
  background-attachment: fixed;
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.8;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

.ob-skip {
  position: fixed; top: -100px; left: 16px; z-index: 200;
  padding: 10px 16px;
  background: var(--yellow); color: var(--ink);
  font-size: var(--fs-sm); font-weight: 700;
  border-radius: var(--radius);
  transition: top var(--t-fast);
}
.ob-skip:focus { top: 12px; }

.ob-container {
  width: 100%; max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad); padding-right: var(--pad);
}

.ob-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
  padding: 0 1px;
}

.ob-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: var(--fs-xs); letter-spacing: .16em; font-weight: 700;
  color: var(--yellow);
}
.ob-eyebrow::before { content: ""; width: 18px; height: 2px; background: var(--yellow); }

.ob-h1 { font-size: var(--fs-h1); line-height: 1.15; font-weight: 900; letter-spacing: -.01em; color: var(--white); }
.ob-h2 { font-size: var(--fs-h2); line-height: 1.2; font-weight: 800; letter-spacing: -.005em; color: var(--white); }
.ob-h3 { font-size: var(--fs-h3); line-height: 1.3; font-weight: 700; color: var(--white); }
.ob-h4 { font-size: var(--fs-h4); line-height: 1.35; font-weight: 700; color: var(--white); }
.ob-lede { max-width: 40ch; font-size: 18px; line-height: 1.85; color: #B9C6D2; }
.ob-text { font-size: var(--fs-body); line-height: 1.8; }
.ob-small { font-size: var(--fs-sm); line-height: 1.7; color: var(--text-dim); }
.ob-rule { height: 1px; border: 0; background: var(--rule); }

.ob-prose { max-width: 38em; font-size: var(--fs-body); line-height: 1.9; color: var(--mist); }
.ob-prose p { margin-bottom: 1.1em; }
.ob-prose > *:last-child { margin-bottom: 0; }
.ob-prose h2 { font-size: var(--fs-h3); line-height: 1.3; font-weight: 700; color: var(--white); margin: 1.6em 0 .6em; }
.ob-prose h3 { font-size: 20px; line-height: 1.4; font-weight: 700; color: var(--white); margin: 1.4em 0 .5em; }
.ob-prose ul { margin: 0 0 1.1em; }
.ob-prose li { position: relative; padding-left: 18px; margin-bottom: .45em; }
.ob-prose li::before { content: ""; position: absolute; left: 0; top: .78em; width: 8px; height: 1px; background: var(--yellow); }
.ob-prose strong { color: var(--white); font-weight: 700; }

/* ---------- 4. 页头 ---------- */
.ob-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(10, 13, 16, .94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

.ob-progress { position: relative; height: 2px; background: var(--rule); overflow: hidden; }
.ob-progress__bar {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--yellow), var(--gold));
  transition: width var(--t-fast);
}

.ob-strip { background: var(--carbon); border-bottom: 1px solid var(--rule); }
.ob-strip__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; min-height: 38px; padding-top: 6px; padding-bottom: 6px;
}
.ob-strip__status {
  display: flex; align-items: center; gap: 8px;
  font-size: var(--fs-xs); letter-spacing: .08em; line-height: 1.6; color: var(--mist);
}
.ob-strip__status .ob-num { color: var(--white); }

.ob-pulse {
  width: 7px; height: 7px; flex: 0 0 auto; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0 rgba(53, 224, 138, .55);
  animation: ob-pulse 1400ms linear infinite;
}
@keyframes ob-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(53, 224, 138, .55); }
  70%  { box-shadow: 0 0 0 7px rgba(53, 224, 138, 0); }
  100% { box-shadow: 0 0 0 0 rgba(53, 224, 138, 0); }
}

.ob-utility { display: flex; align-items: center; gap: 20px; }
.ob-utility__link {
  display: inline-block;
  font-size: var(--fs-xs); letter-spacing: .08em; color: var(--text-dim);
  border-bottom: 1px solid transparent; padding-bottom: 1px;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.ob-utility__link:hover, .ob-utility__link:focus-visible { color: var(--yellow); border-bottom-color: var(--yellow); }

.ob-header__main {
  display: flex; align-items: center; gap: 28px;
  min-height: 78px; padding-top: 10px; padding-bottom: 10px;
}

.ob-brand { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.ob-brand__mark {
  position: relative; width: 32px; height: 32px; flex: 0 0 auto;
  background: var(--yellow);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}
.ob-brand__mark::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to top right, transparent 47%, var(--ink) 47%, var(--ink) 53%, transparent 53%);
}
.ob-brand__text { display: block; }
.ob-brand__name {
  display: block; font-size: 20px; font-weight: 900; letter-spacing: .02em;
  line-height: 1.2; color: var(--white);
}
.ob-brand__tag {
  display: block; font-size: var(--fs-xs); letter-spacing: .18em;
  line-height: 1.5; color: var(--yellow);
}

.ob-nav { margin-left: auto; }
.ob-nav__list { display: flex; align-items: flex-end; }
.ob-nav__item { position: relative; }
.ob-nav__link {
  position: relative; display: block;
  padding: 18px 16px 14px;
  font-size: var(--fs-sm); line-height: 1.4; color: var(--text-mid);
  border-bottom: 2px solid transparent;
  transition: color var(--t-fast), background-color var(--t-fast), border-color var(--t-fast);
}
.ob-nav__link::before {
  content: ""; position: absolute; left: 16px; top: 6px;
  width: 12px; height: 1px; background: var(--rule);
  transition: width var(--t-fast), background-color var(--t-fast);
}
.ob-nav__link:hover, .ob-nav__link:focus-visible {
  color: var(--white); background: var(--navy); border-bottom-color: var(--yellow);
}
.ob-nav__link:hover::before, .ob-nav__link:focus-visible::before {
  width: 24px; background: var(--yellow);
}
.ob-nav__link[aria-current="page"] { color: var(--yellow); border-bottom-color: var(--yellow); }
.ob-nav__link[aria-current="page"]::before { width: 24px; height: 2px; background: var(--yellow); }

.ob-nav-toggle {
  display: none; order: 3; margin-left: auto;
  align-items: center; gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--rule); border-radius: var(--radius);
  font-size: var(--fs-xs); letter-spacing: .08em; color: var(--mist);
  transition: border-color var(--t-fast), color var(--t-fast);
}
.ob-nav-toggle:hover { border-color: var(--yellow); color: var(--yellow); }
.ob-nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; }
.ob-nav-toggle__bars i {
  display: block; width: 16px; height: 1px; background: var(--yellow);
  transition: transform var(--t-fast), opacity var(--t-fast);
}
.ob-header[data-open] .ob-nav-toggle__bars i:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.ob-header[data-open] .ob-nav-toggle__bars i:nth-child(2) { opacity: 0; }
.ob-header[data-open] .ob-nav-toggle__bars i:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

/* ---------- 5. 通用按钮与链接 ---------- */
.ob-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px;
  font-size: var(--fs-sm); font-weight: 700; letter-spacing: .04em; line-height: 1.3;
  border: 1px solid var(--rule); border-radius: var(--radius);
  color: var(--mist); background: transparent;
  transition: background-color var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}
.ob-btn--primary { background: var(--yellow); border-color: var(--yellow); color: var(--ink); }
.ob-btn--primary:hover, .ob-btn--primary:focus-visible { background: var(--gold); border-color: var(--gold); }
.ob-btn--ghost:hover, .ob-btn--ghost:focus-visible { border-color: var(--yellow); color: var(--yellow); }
.ob-btn--quiet { border-color: transparent; color: var(--text-dim); padding-left: 0; padding-right: 0; }
.ob-btn--quiet:hover, .ob-btn--quiet:focus-visible { color: var(--yellow); }

.ob-link {
  position: relative; display: inline-block; color: var(--yellow);
  padding-bottom: 2px; transition: color var(--t-fast);
}
.ob-link::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 100%; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: left;
  transition: transform var(--t-line);
}
.ob-link:hover::after, .ob-link:focus-visible::after { transform: scaleX(1); }

/* ---------- 6. 章节与栅格 ---------- */
.ob-section { position: relative; padding: 72px 0; border-top: 1px solid var(--rule); }
.ob-section--alt { background: var(--navy); }
.ob-section--tight { padding: 40px 0; }
.ob-section--wide { padding: 96px 0; }
.ob-section__head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 32px; }

.ob-diagonal { position: relative; height: 72px; overflow: hidden; }
.ob-diagonal::before {
  content: ""; position: absolute; left: -6%; right: -6%; top: 50%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--rule) 12%, var(--yellow) 50%, var(--rule) 88%, transparent);
  transform: rotate(-2.2deg);
}

.ob-grid { display: grid; gap: 24px; }
.ob-grid--5-7 { grid-template-columns: 5fr 7fr; }
.ob-grid--7-5 { grid-template-columns: 7fr 5fr; }
.ob-grid--4-8 { grid-template-columns: 4fr 8fr; }
.ob-grid--auto { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* ---------- 7. 数据组件 ---------- */
.ob-card {
  position: relative;
  background: var(--carbon);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 22px;
  transition: background-color var(--t-fast), border-color var(--t-fast);
}
.ob-card:hover { background: var(--navy); border-color: #37454F; }
.ob-card--link { display: block; }
.ob-card__head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 16px;
  padding-bottom: 12px; border-bottom: 1px solid var(--rule);
}
.ob-card__title { font-size: 20px; font-weight: 800; line-height: 1.35; color: var(--white); }
.ob-card__body { margin-top: 14px; font-size: 15px; line-height: 1.85; color: var(--text-mid); }
.ob-card:hover .ob-card__body .ob-num { color: var(--gold); }

.ob-stat-row {
  display: grid; gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  background: var(--rule); border: 1px solid var(--rule); border-radius: var(--radius);
  overflow: hidden;
}
.ob-stat { display: flex; flex-direction: column; gap: 4px; padding: 18px; background: var(--carbon); }
.ob-stat--accent { box-shadow: inset 0 2px 0 0 var(--yellow); }
.ob-stat__value {
  font-family: var(--font-mono); font-size: 28px; font-weight: 700;
  line-height: 1.2; color: var(--white); font-variant-numeric: tabular-nums;
}
.ob-stat__label { font-size: var(--fs-xs); letter-spacing: .08em; color: var(--text-dim); }

.ob-data-list { border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; }
.ob-data-list__row {
  display: grid; grid-template-columns: minmax(120px, 1fr) 2fr; gap: 16px;
  padding: 12px 16px; background: var(--carbon); border-bottom: 1px solid var(--rule);
}
.ob-data-list__row:last-child { border-bottom: 0; }
.ob-data-list__key { font-size: 13px; letter-spacing: .04em; color: var(--text-dim); }
.ob-data-list__val { font-size: 15px; line-height: 1.7; color: var(--mist); }
.ob-data-list__val .ob-num { color: var(--white); }

.ob-timeline { position: relative; padding-left: 26px; }
.ob-timeline::before {
  content: ""; position: absolute; left: 5px; top: 6px; bottom: 6px;
  width: 1px; background: var(--rule);
}
.ob-timeline__item { position: relative; padding-bottom: 22px; }
.ob-timeline__item:last-child { padding-bottom: 0; }
.ob-timeline__dot {
  position: absolute; left: -26px; top: 6px;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--ink); border: 2px solid var(--yellow);
}
.ob-timeline__time {
  display: block; font-family: var(--font-mono); font-size: 13px;
  font-weight: 700; color: var(--green); margin-bottom: 4px;
}

.ob-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: var(--radius);
  font-size: var(--fs-xs); letter-spacing: .08em; line-height: 1.5;
  border: 1px solid var(--rule); background: var(--navy); color: #B9C6D2;
}
.ob-tag--gold { border-color: #6A5714; background: rgba(255, 198, 26, .14); color: var(--gold); }
.ob-tag--green { border-color: #1C6A45; background: rgba(53, 224, 138, .12); color: var(--green); }
.ob-tag--signal { border-color: #6B2A22; background: rgba(255, 91, 69, .12); color: var(--signal); }

/* ---------- 8. 面包屑 / 旁注 ---------- */
.ob-breadcrumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
  padding: 18px 0; font-size: var(--fs-xs); letter-spacing: .06em; color: #7F8C99;
}
.ob-breadcrumb__item { display: inline-flex; align-items: center; gap: 10px; }
.ob-breadcrumb__sep { color: var(--rule); }
.ob-breadcrumb a { transition: color var(--t-fast); }
.ob-breadcrumb a:hover, .ob-breadcrumb a:focus-visible { color: var(--yellow); }
.ob-breadcrumb [aria-current="page"] { color: var(--mist); }

.ob-note {
  padding: 16px 18px;
  border-left: 2px solid var(--yellow);
  background: var(--carbon);
  font-size: var(--fs-sm); line-height: 1.9; color: var(--text-mid);
}
.ob-note__label {
  display: block; margin-bottom: 6px;
  font-size: var(--fs-xs); letter-spacing: .12em; font-weight: 700; color: var(--yellow);
}
.ob-note--signal { border-left-color: var(--signal); }
.ob-note--signal .ob-note__label { color: var(--signal); }

/* ---------- 9. 图片容器（供页面阶段使用） ---------- */
.ob-media {
  position: relative; overflow: hidden;
  border: 1px solid var(--rule); border-radius: var(--radius);
  background: var(--carbon);
}
.ob-media__img, .ob-media img {
  width: 100%; height: 100%; object-fit: cover;
  filter: saturate(.95) contrast(1.08);
}
.ob-media--21x9 { aspect-ratio: 21 / 9; }
.ob-media--16x9 { aspect-ratio: 16 / 9; }
.ob-media--4x3 { aspect-ratio: 4 / 3; }
.ob-media--1x1 { aspect-ratio: 1 / 1; }
.ob-media::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, rgba(10, 13, 16, 0) 43%, rgba(10, 13, 16, .82) 100%);
}
.ob-media--plain::after { display: none; }
.ob-media__cap {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 1;
  padding: 12px 14px;
  font-size: var(--fs-xs); letter-spacing: .06em; line-height: 1.6; color: var(--mist);
}

/* ---------- 10. 页脚 ---------- */
.ob-footer {
  position: relative;
  background: var(--navy);
  border-top: 1px solid var(--rule);
}
.ob-footer__edge {
  display: block; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg,
    var(--yellow) 0 22%,
    var(--green) 22% 34%,
    var(--rule) 34% 100%);
}
.ob-footer__inner { padding-top: 56px; padding-bottom: 28px; }

.ob-footer__top {
  display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 48px; padding-bottom: 40px; border-bottom: 1px solid var(--rule);
}
.ob-brand--footer .ob-brand__mark { width: 36px; height: 36px; }
.ob-footer__note {
  margin-top: 18px; max-width: 44ch;
  font-size: var(--fs-sm); line-height: 1.9; color: var(--text-dim);
}
.ob-footer__stamp {
  margin-top: 14px;
  font-size: var(--fs-xs); letter-spacing: .1em; color: #7A8794;
}
.ob-footer__stamp .ob-num { color: var(--green); }

.ob-footer__title {
  margin: 0 0 14px;
  font-size: var(--fs-xs); letter-spacing: .14em; font-weight: 700;
  color: var(--yellow);
}
.ob-contact__list { display: grid; gap: 8px; }
.ob-contact__row {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px;
  background: var(--carbon); border: 1px solid var(--rule); border-radius: var(--radius);
}
.ob-contact__key { flex: 0 0 auto; font-size: var(--fs-xs); letter-spacing: .08em; color: #8B99A6; }
.ob-contact__val {
  flex: 1 1 auto; min-width: 0;
  font-family: var(--font-mono); font-size: var(--fs-sm); font-weight: 700;
  color: var(--white); word-break: break-all;
}
.ob-contact__val--text { font-family: var(--font-sans); font-weight: 400; font-size: 13px; color: var(--mist); }
.ob-contact__row--wide .ob-contact__val { font-family: var(--font-sans); font-weight: 400; }

.ob-copy {
  flex: 0 0 auto;
  padding: 5px 10px;
  font-size: var(--fs-xs); letter-spacing: .08em;
  border: 1px solid var(--rule); border-radius: var(--radius); color: var(--text-mid);
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}
.ob-copy:hover, .ob-copy:focus-visible { color: var(--yellow); border-color: var(--yellow); }
.ob-copy.is-copied { color: var(--green); border-color: var(--green); background: rgba(53, 224, 138, .12); }
.ob-copy.is-failed { color: var(--signal); border-color: var(--signal); background: rgba(255, 91, 69, .12); }

.ob-footer__cols {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px;
  padding: 40px 0; border-bottom: 1px solid var(--rule);
}
.ob-footer__col { min-width: 0; }
.ob-footer__list { display: grid; gap: 10px; }
.ob-footer__link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: var(--fs-sm); line-height: 1.6; color: #C3CEDA;
  transition: color var(--t-fast);
}
.ob-footer__link::before {
  content: ""; width: 6px; height: 1px; flex: 0 0 auto; background: var(--rule);
  transition: width var(--t-fast), background-color var(--t-fast);
}
.ob-footer__link:hover, .ob-footer__link:focus-visible { color: var(--yellow); }
.ob-footer__link:hover::before, .ob-footer__link:focus-visible::before { width: 14px; background: var(--yellow); }

.ob-footer__legal {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 16px; padding-top: 22px;
}
.ob-footer__meta { font-size: var(--fs-xs); letter-spacing: .06em; line-height: 1.8; color: #7A8794; }
.ob-footer__meta .ob-num { color: var(--green); }
.ob-footer__legal-links { display: flex; flex-wrap: wrap; gap: 18px; }
.ob-footer__legal-links a {
  font-size: var(--fs-xs); letter-spacing: .06em; color: #7A8794;
  transition: color var(--t-fast);
}
.ob-footer__legal-links a:hover, .ob-footer__legal-links a:focus-visible { color: var(--yellow); }

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1120px) {
  .ob-header__main { gap: 16px; }
  .ob-nav__link { padding-left: 12px; padding-right: 12px; }
  .ob-nav__link::before { left: 12px; }
}

@media (max-width: 960px) {
  .ob-header__main { flex-wrap: wrap; gap: 10px; min-height: 64px; }
  .ob-brand { order: 1; }
  .ob-header__cta { order: 2; padding: 9px 12px; font-size: 13px; }
  .ob-nav-toggle { display: inline-flex; }
  .ob-nav {
    order: 4; margin-left: 0;
    flex: 1 0 100%; width: 100%;
    max-height: 0; overflow: hidden;
    transition: max-height var(--t-fold);
  }
  .ob-header[data-open] .ob-nav { max-height: 480px; }
  .ob-nav__list { flex-direction: column; align-items: stretch; border-top: 1px solid var(--rule); padding-bottom: 10px; }
  .ob-nav__item { border-bottom: 1px solid var(--rule); }
  .ob-nav__link { padding: 14px 4px 14px 20px; border-bottom: 0; color: var(--mist); }
  .ob-nav__link::before { left: 0; top: 50%; width: 10px; height: 2px; margin-top: -1px; }
  .ob-nav__link:hover, .ob-nav__link:focus-visible { background: transparent; color: var(--yellow); }
  .ob-nav__link:hover::before, .ob-nav__link:focus-visible::before { width: 14px; }
  .ob-nav__link[aria-current="page"] { color: var(--yellow); box-shadow: inset 3px 0 0 0 var(--yellow); }
  .ob-nav__link[aria-current="page"]::before { width: 14px; height: 2px; background: var(--yellow); }

  .ob-grid--5-7, .ob-grid--7-5, .ob-grid--4-8 { grid-template-columns: 1fr; }
  .ob-footer__top { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 720px) {
  :root { --pad: 18px; }
  body { background-size: 32px 32px; font-size: 16px; }
  .ob-strip__inner { flex-direction: column; align-items: flex-start; gap: 4px; padding-top: 8px; padding-bottom: 8px; }
  .ob-utility { gap: 14px; }
  .ob-brand__mark { width: 28px; height: 28px; }
  .ob-brand__name { font-size: 18px; }
  .ob-section { padding: 48px 0; }
  .ob-section--wide { padding: 64px 0; }
  .ob-card { padding: 18px; }
  .ob-stat__value { font-size: 24px; }
  .ob-data-list__row { grid-template-columns: 1fr; gap: 4px; }
  .ob-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
  .ob-footer__legal { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .ob-nav-toggle__label { display: none; }
  .ob-footer__cols { grid-template-columns: 1fr; }
  .ob-contact__row { flex-wrap: wrap; }
}

/* ---------- 12. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ob-pulse { animation: none; box-shadow: 0 0 0 3px rgba(53, 224, 138, .22); }
  .ob-progress__bar { transition: none; }
  .ob-nav { transition: none; }
  .ob-nav__link::before,
  .ob-nav-toggle__bars i,
  .ob-footer__link::before,
  .ob-link::after { transition: none; }
}